CN110302013A - Soft stool is included in porous chips and absorbent commodity - Google Patents

Abstract

The present invention relates to a porous sheet for containing soft stools and an absorbent article. The technical problem to be solved by the present invention is to provide a loose stool receiving porous sheet capable of taking loose stool inside and maintaining soft stool more stably, and an absorbent article provided with the porous sheet. A porous sheet (100) for containing soft feces includes a sheet body (10) having a plurality of through holes (21) penetrating in a thickness direction. The sheet main body (10) has a partition (30) defining a through hole (21).

Description

Porous sheets and absorbent articles for incorporation of soft stools

technical field

The present invention relates to a porous sheet for receiving soft stools and an absorbent article including the porous sheet.

Background technique

Absorbent articles such as disposable diapers, urine pads, and sanitary napkins are conventionally known. Absorbent articles are provided with a water-permeable top sheet in contact with the skin, and an absorbent body comprising a fibrous material such as pulp or rayon and a superabsorbent polymer. Liquid moisture such as urine or menstrual blood excreted by the wearer (hereinafter referred to as "excreted moisture") passes through the top sheet and is absorbed and retained by the absorbent body.

On the other hand, for soft stools, muddy stools, watery stools and the like that contain liquid components and solid components (hereinafter they are collectively referred to as "soft stools"), the solid components cannot penetrate the top sheet and Not easily absorbed by the top sheet. Therefore, there is a possibility that soft stools spread on the top sheet without being absorbed by the absorbent body and leak out from the end of the absorbent article. In this case, stains, odors, etc. may occur on the clothes. Such a condition is sometimes referred to as "side leakage". In addition, soft feces may remain between the wearer's skin and the top sheet and adhere to the skin, thereby giving discomfort to the wearer, causing troubles such as rashes on the skin, or requiring work such as wiping off. In view of this, an absorbent article has been proposed in which a plurality of holes for letting soft stools pass through is formed on a top sheet (top sheet) facing the skin (see Patent Document 1).

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2007-97643

Contents of the invention

The problem to be solved by the invention

An object of the present invention is to provide a porous sheet for containing loose stools capable of containing loose stools and maintaining soft stools, and an absorbent article including the porous sheet.

means to solve the problem

Here, the disclosed porous stool sheet is characterized in that it includes a sheet main body having a plurality of through holes penetrating in the thickness direction. The sheet main body includes a partition wall that defines the through-hole.

It is preferable that the depth of the above-mentioned through hole is larger than the hole diameter (preferable example 1). In addition, it is preferable that the partition wall has a permeation hole that communicates with the adjacent through-hole and is capable of permeating moisture (preferable example 2). In addition, it is preferable that a superabsorbent polymer is adhered to the partition wall (preferable example 3).

Moreover, the absorbent article disclosed here is equipped with the said porous sheet for containing soft stools, and the absorber which is provided in one surface side of the said porous sheet for containing soft stools, and which consists of a superabsorbent polymer.

Moreover, the absorbent article disclosed here is equipped with the said porous sheet for containing soft stools, and the support sheet which is provided in one side of the said porous sheet for containing soft stools, and absorbs water|moisture content.

The effect of the invention

According to the porous sheet for containing loose stools and the absorbent article including the porous sheet shown in the present invention, it is possible to contain loose stools inside. In addition, by increasing the strength of the porous sheet for receiving soft stools, it is possible to more stably maintain soft stools. In Preferable Example 1, it is possible to take in soft stools more reliably and to maintain soft stools more stably. In addition, in preferred example 2, by further diffusing the water that has passed through the permeation holes and taken in the porous stool sheet, the soft stool taken inside can be retained in the porous stool sheet. In addition, in Preferable Example 3, the liquid component contained in the soft stool can be further retained by the superabsorbent polymer.

Description of drawings

Fig. 1 is a developed view of a disposable diaper (absorbent article) according to a first embodiment.

Fig. 2 is a sectional view taken along the line II-II of Fig. 1 .

Fig. 3 is a perspective view showing an example of the porous stool containing sheet having a honeycomb pattern structure according to the first embodiment.

Fig. 4 is a plan cross-sectional view showing an example of the porous stool containing sheet having a honeycomb pattern structure according to the first embodiment.

5 is a perspective view showing an example of the porous stool containing sheet having a corrugated pattern structure according to the first embodiment.

Fig. 6 is a plan cross-sectional view showing an example of the porous stool containing sheet having a corrugated pattern structure according to the first embodiment.

Fig. 7 is a perspective view showing a modified example of the porous stool-accommodating sheet according to the first embodiment.

Fig. 8 is a plan cross-sectional view showing a modified example of the porous stool containing sheet of the first embodiment.

Fig. 9 is a cross-sectional view of a disposable diaper (absorbent article) according to a second embodiment.

Fig. 10 is a perspective view showing an example of a porous stool containing sheet having a honeycomb pattern structure according to a second embodiment.

Fig. 11 is a plan cross-sectional view showing an example of the porous stool containing sheet having a honeycomb pattern structure according to the second embodiment.

Fig. 12 is a perspective view showing an example of a porous stool containing sheet having a corrugated pattern structure according to a second embodiment.

Fig. 13 is a plan cross-sectional view showing an example of the porous stool containing sheet having a corrugated pattern structure according to the second embodiment.

Fig. 14 is a cross-sectional view of a disposable diaper (absorbent article) according to a third embodiment.

Fig. 15 is a perspective view showing an example of a porous stool containing sheet having a honeycomb pattern structure according to a third embodiment.

Fig. 16 is a plan cross-sectional view showing an example of a porous stool containing sheet having a honeycomb pattern structure according to a third embodiment.

Fig. 17 is a perspective view showing an example of a porous stool containing sheet having a corrugated pattern structure according to a third embodiment.

Fig. 18 is a plan cross-sectional view showing an example of a porous stool containing sheet having a corrugated pattern structure according to a third embodiment.

Fig. 19 is a perspective view showing a modified example of the porous stool-accommodating sheet according to the third embodiment.

Fig. 20 is a plan cross-sectional view showing a modified example of the porous stool-accommodating sheet according to the third embodiment.

Fig. 21 is a developed view showing a modified example of the porous sheet for containing soft feces.

Fig. 22 is a developed view showing another modified example of the porous sheet for containing soft stools.

Detailed ways

Modes for implementing the present invention will be described below. The following embodiments are merely illustrative, and are not intended to exclude various modifications or technical applications not explicitly described in the embodiments. Each configuration of the present embodiment can be implemented with various modifications within the scope not departing from the gist. In addition, you can make choices according to your needs, and you can also combine them as appropriate.

The absorbent article described in the embodiments is a hygienic article worn by a wearer and capable of absorbing and retaining liquid moisture such as urine or menstrual blood excreted by the wearer, or excrement such as soft feces. In this absorbent article, in addition to an absorbent article provided with a layered body including an absorbent body such as a belt-type or underpants-type paper diaper (so-called "disposable diaper") and pull-up pants, urine is also included. Absorbent articles such as pads, sanitary napkins, and pantiliners, etc., which include only a laminate including an absorbent body. In the following embodiments, a pants-type disposable diaper is exemplified as an absorbent article.

In the present embodiment, the direction connecting the front body arranged to face the abdomen of the wearer and the back body arranged to face the back of the diaper is defined as the longitudinal direction. The crotch part arranged under the wearer's crotch (towards the crotch) is located between these front and back parts (the center in the longitudinal direction). In addition, in the state where the diaper is worn by the wearer (hereinafter simply referred to as "wearing state"), the side (inner side) facing the wearer's skin is regarded as the skin-facing side, and the skin-facing side is The opposite side (outer side) was regarded as the non-facing side of the skin. In addition, let the direction connecting the skin-facing side and the skin-non-facing side be the thickness direction, and let the direction perpendicular to both the longitudinal direction and the thickness direction be the width direction. In addition, let the direction of the surface orthogonal to a thickness direction be a surface direction. In addition, let the figure seen from the thickness direction be a top view.

The direction of each structure in a diaper includes not only parallel to the longitudinal direction but also substantially parallel to the longitudinal direction when expressing, for example, along the longitudinal direction. Specifically, extending with an inclination angle of less than 45° relative to the longitudinal direction is defined as along the longitudinal direction. Similarly, when expressed as being along each direction such as the width direction and the thickness direction, it also means extending with an inclination angle of less than 45° with respect to each direction. In addition, in this specification, description of the numerical range of "1-100", for example, includes both the lower limit value "1" and the upper limit value "100". In addition, description of other numerical ranges is also the same.

[1. Composition]

[first embodiment]

The configurations of the loose stool receiving porous sheet 100 and the disposable diaper 300 according to the first embodiment will be described with reference to FIGS. 1 to 6 . In addition, in the sectional view of FIG. 2, in order to understand each structure easily, the thickness of each sheet|seat is shown exaggeratedly.

In FIG. 1 , the diaper 300 is formed symmetrically with respect to the center line A in the width direction. The diaper 300 is roughly divided into three regions of a front body 300A, a crotch portion 300B, and a rear body 300C along the longitudinal direction. The crotch portion 300B is a region located under the crotch of the wearer when the diaper 300 is worn.

The diaper 300 includes an absorbent laminate (hereinafter also referred to as a "laminate") 200 in a crotch 300B. As shown in FIG. 2 , the laminate 200 includes a porous sheet (hereinafter also referred to as a "porous sheet") 100 for taking in soft stools. Moreover, the laminated body 200 is equipped with the absorber 40 provided in the end surface 10b side which is one main surface of the porous sheet 100. As shown in FIG. Moreover, the laminated body 200 is equipped with the top sheet 51 provided in the end surface 10a side which is the other main surface of the porous sheet 100. As shown in FIG. Moreover, the laminated body 200 is provided with the backsheet 55 provided in the surface of the absorber 40 opposite to the surface on which the porous sheet 100 was provided. That is, the laminate 200 is a mat-like laminate structure in which at least the top sheet 51, the porous sheet 100, the absorber 40, and the back sheet 55 are laminated in this order.

Here, in this specification, being provided on the surface of the porous sheet 100 means not only including the form in which the absorbent body 40 or the top sheet 51 is directly placed on the surface of the porous sheet 100, but also including the method of interposing the absorbent body 40 or the top sheet 51 on the surface of the porous sheet 100. There are optional layers (for example, adhesive layers, etc.) in the form. Similarly, being provided on the surface of the absorber 40 includes not only the form in which the porous sheet 100 or the backsheet 55 is directly placed on the surface of the absorber 40 but also the arrangement of any layer between the absorber 40 and the absorber 40 . The way. In addition, the layered structure in which at least the top sheet 51, the porous sheet 100, the absorber 40, and the back sheet 55 are sequentially laminated means not only a structure in which each layer is directly laminated, but also a structure in which each layer is directly laminated. An arbitrary layer structure is further provided between the layers. Among them, it is preferable not to provide another layer between the porous sheet 100 and the absorbent body 40 and the top sheet 51 from the viewpoint of facilitating the flow of solid or liquid components between the porous sheet 100 and the absorbent body 40 and the top sheet 51 . Alternatively, when an adhesive layer is provided between the porous sheet 100, the absorber 40, and the top sheet 51, it is preferable to suppress the area of the adhesive layer so as not to interfere with the flow of solid content or moisture to maintain the adhesion between the layers. required degree. It should be noted that the solid content in this specification refers to components other than liquid, for example, refers to the components including digested or undigested food residues, internal cells such as small intestine and large intestine or their dead bodies, intestinal cells such as Escherichia coli or their dead bodies, etc. stool. In addition, the concept of a solid component includes not only a solid solid substance but also a semi-solid substance that exhibits plasticity or fluidity including solids and liquids.

Each component of the porous sheet 100, the laminate 200, and the disposable diaper 300 will be described below.

[porous sheet]

The porous sheet 100 is a sheet-like member that holds soft stools inside and prevents soft stools from spreading in the lateral direction (surface direction). The porous sheet 100 is mainly used for soft stool intake, and it can be positioned as a porous sheet for soft stool intake.

<Basic composition of porous sheet>

As shown in FIGS. 1 and 2 , the porous sheet 100 includes a sheet main body 10 . The sheet main body 10 has a plurality of through-holes 21 penetrating from one end surface 10a (the other surface) facing each other to the other end surface 10b (one surface) in the thickness direction. At least one end of the through-hole 21 is opened on the end surface 10 a and the other end is opened on the end surface 10 b. For example, the through-hole 21 may extend obliquely with respect to the thickness direction, may bend inside the sheet main body 10 , may branch inside the sheet main body 10 , or may merge a plurality of through-holes 21 . Among them, the through-hole 21 is preferably formed in a straight line from the viewpoint of taking the soft stool into the inside of the through-hole 21 and allowing the liquid component contained in the soft stool to flow out quickly. In addition, the axial direction of the through hole 21 connecting the opening on the end surface 10 a side and the opening on the end surface 10 b side of the through hole 21 preferably coincides with the thickness direction of the sheet main body 10 . Such through-holes 21 are also preferable in that they can be mass-produced by a known manufacturing method described later.

The sheet main body 10 includes partition walls 30 that define the through holes 21 . The partition wall 30 is a structural member for forming a plurality of through-holes 21 inside the sheet main body 10 in plan view. That is, each through-hole 21 is partitioned and divided by the partition wall 30 .

In the present embodiment, the partition wall 30 is a plate-shaped member extending in the thickness direction of the sheet main body 10, and forms the chambers 11a, 11b as structural units surrounding the through-hole 21 (refer to FIGS. 6). Then, the porous sheet 100 is formed by aggregating a plurality of the cells 11 a and 11 b along the surface direction of the sheet main body 10 . Alternatively, the porous sheet 100 may also be referred to as a porous body. In this porous body, the plate-shaped or block-shaped sheet main body 10 forms a plurality of through-holes 21 penetrating in the thickness direction, and the through-holes 21 are formed through the partition wall 30 as the remaining part. Holes 21 are spaced apart. By providing the porous sheet 100 with the through-holes 21 and the partition walls 30 , soft feces can be contained in the porous sheet 100 and the strength in the thickness direction can be maintained. In addition, in this specification, plate shape is not limited by the thickness of a member, For example, it is a concept including film shape, sheet shape, block shape, etc. In addition, the thickness of the partition wall 30 may be uniform or non-uniform and may vary.

The shape of the porous sheet 100 is not particularly limited as long as it has a size and a shape that can accommodate loose stool excreted by the wearer. In this embodiment, the case where the porous sheet 100 is substantially the same shape as the absorber 40 mentioned later is shown as an hourglass shape in planar view was exemplified. Thus, by making the porous sheet 100 and the absorber 40 substantially the same shape, the porous sheet 100 can cover the area|region containing the front body 300A, the crotch part 300B, and the back body 300C. And, the porous sheet 100 can block the excrement excreted in these regions, thereby preventing the excrement from leaking out of the diaper 300 . In addition, by providing the porous sheet 100 on the absorber 40 , when the porous sheet 100 takes in soft feces from the one end surface 10 a side of the through hole 21 , the absorber 40 exists on the other end surface 10 b side. Therefore, the absorber 40 functions as a stopper on the side of the end surface 10b, and can prevent soft feces contained in the through hole 21 from passing through the through hole 21 and directly flowing out from the end surface 10b to pass through the porous sheet 100. Furthermore, the absorber 40 can absorb the liquid component contained in the soft stool taken in the through-hole 21 through the end surface 10b while retaining the solid content of the soft stool in the inside of the through-hole 21 . Wherein, the plan view shape of the porous sheet 100 is not limited to the hourglass shape, for example, it may also be circular, elliptical, oblong, rectangular, etc. in plan view. The porous sheet 100 is preferably shaped smaller than the absorber 40 in order for the absorber 40 to function as a stopper on the end surface 10b side and to absorb liquid components through the end surface 10b. In addition, the porous sheet 100 is preferably disposed at least at the anus of the wearer.

As will be described later, the porous sheet 100 can be produced by cutting the elongated partition wall 30 in the thickness direction so that the depth of the through hole 21 becomes a desired length. At this time, the end of the partition wall 30 located on the end surface 10 a of the sheet body 10 is preferably chamfered on a flat surface or a round surface, more preferably a chamfer on a round surface. If the ends of the partition walls 30 are directly cut without being chamfered, the wearer may feel uncomfortable when the porous sheet 100 comes into contact with the wearer's skin surface. By forming the chamfer of the partition wall 30 , it is possible to reduce or eliminate such uncomfortable feeling during wearing. The chamfering of the partition walls 30 is performed, for example, by subjecting the ends of the partition walls 30 to cutting treatment, grinding treatment, heat treatment, flame radiation treatment, ultrasonic treatment, and the like. It should be noted that the end surface 10a and the end surface 10b of the sheet main body 10 are sometimes difficult to distinguish visually, so the ends of the end surface 10a and the end surface 10b may be chamfered in order to save the effort of identification.

<through hole>

The porous sheet 100 may have penetration holes (not shown) penetrating through the partition walls 30 on the side surfaces of the partition walls 30 . Due to the permeation holes, the liquid components included in the soft stools contained in the porous sheet 100 can pass through the partition wall 30 through the permeation holes. As a result, the liquid component contained in the soft stool spreads into the adjacent through-holes 21 and diffuses in the porous sheet 100 . Furthermore, by making the absorber 40 absorb the diffused liquid component, it is possible to quickly absorb the liquid component over a wider area. On the other hand, from the viewpoint of increasing the strength of the porous sheet 100 , it is preferable that the porous sheet 100 has no permeation holes in the partition walls 30 . That is, it is preferable that the wall surface of the partition wall 30 extends continuously without interruption from the end surface 10 a to the end surface 10 b. In this case, the entire wall surface of the partition wall 30 can support the load applied to the partition wall 30 , and the strength of the porous sheet 100 can be improved.

<Material of porous sheet>

As a material which comprises the porous sheet 100, paper, a synthetic paper, a synthetic resin, a nonwoven fabric etc. are mentioned, for example. Among these, paper, synthetic paper, and synthetic resin are preferable from the viewpoint of strength and impeding the penetration of soft feces, and synthetic paper and synthetic resin are more preferable from the viewpoint of water resistance, and more preferable from the viewpoint of cost and productivity. Synthetic resins are preferred. Among them, the water resistance in the case of paper can be improved by making the resin adhere to the paper or impregnate the paper.

As paper, paper containing pulp as a main component is used. The raw material of pulp is not particularly limited, and examples thereof include wood pulp such as coniferous trees and broad-leaved trees; non-wood pulp such as kenaf, hemp, bamboo, and rice straw; and pulp obtained from raw material pulp such as old paper pulp. In addition, the method of making pulp is not particularly limited, for example, chemical pulp such as kraft pulp (KP) and sulfide pulp (SP); ground wood pulp (GP), disc refiner pulp (RGP), thermomechanical pulp (TMP) and other mechanical pulp. These pulps may be used alone or in combination of two or more. In addition, as paper, from the viewpoint of obtaining the desired strength, the weight of the paper used is usually 50 g/m ² or more, preferably 100 g/m ² or more, more preferably 150 g/m ² or more, and usually 400 g/m ² or less, preferably 300 g/m ² or less, more preferably 200 g/m ² or less paper.

The synthetic resin is not particularly limited, and for example, polyester-based resins such as polyethylene terephthalate and polytrimethylene terephthalate; polyolefin-based resins such as polyethylene and polypropylene; nylon-6, nylon- 6, 6 and other thermoplastic resins such as polyamide resins. These thermoplastic resins may be used alone or in combination of two or more.

As the synthetic paper, paper produced by using the above-mentioned synthetic resin as a raw material by, for example, an internal paper-making method, a surface coating method, a surface treatment method, or the like can be used.

As the nonwoven fabric, a nonwoven fabric produced by using the above-mentioned synthetic resin as a raw material by a hot rolling method, a spunbonding method, a needle punching method, a spunlace method, a hot air method, a meltblowing method, or the like can be used. From the aspect of preventing soft feces from invading and passing through the fiber gap of the partition wall 30 made of nonwoven fabric, the weight per unit area of the nonwoven fabric is preferably 50 g/m ² or more, more preferably 100 g/m ² or more, and even more preferably Above 150g/ ^m2 . The upper limit of the weight per unit area is not particularly limited, but if the weight per unit area is too high, the thickness of the partition wall increases and the volume of the through hole 21 tends to decrease, so the weight per unit area is preferably 1000 g/m ² or less.

From the perspective of improving strength, water resistance, and impermeability that prevents soft feces from permeating, paper and non-woven fabrics can be made of resin-adhered or impregnated materials. At this time, the resin to be attached or impregnated is not particularly limited, and for example, the above-mentioned thermoplastic resins can be used. Alternatively, a thermosetting resin may be used. It should be noted that, in the case where the non-woven fabric is attached or impregnated with resin, in order to improve the impermeability of soft stools, a non-woven fabric with a basis weight of less than 50 g/m ² can be used. The basis weight of the nonwoven fabric in this case is preferably 20 g/m ² or more, more preferably 30 g/m ² or more, and still more preferably 40 g/m ² or more.

<Ratio of depth to aperture>

The depth of the through hole 21 is greater than the diameter of the hole. That is, the ratio of the depth to the diameter of the through hole 21 (aspect ratio) is preferably greater than 1. The ratio of the depth of the through hole 21 to the diameter of the hole is usually greater than 1, preferably 1.3 or more, more preferably 1.6 or more, further preferably 2 or more, particularly preferably 2.5 or more, and is usually 8 or less, preferably 6 or less, more preferably 5 or less, more preferably 4 or less. When the ratio of the depth to the hole diameter is greater than or equal to the above-mentioned lower limit value, the length in the thickness direction tends to increase, and it is easy to secure a volume for storing soft feces inside the through-hole 21 . It should be noted that when the ratio of the depth to the pore diameter is lower than the above-mentioned lower limit value, the pore diameter increases relative to the depth, the effect due to capillarity is weakened, and soft feces easily fall out of the through-hole 21 . When the ratio of the depth to the pore diameter is not more than the above-mentioned upper limit, it is easy to prevent the through-holes from being deformed and broken midway when a load is applied to the porous sheet 100 . In addition, there is a tendency that the hole diameter is relatively easy to increase, and it is easy to quickly take soft feces into the inside of the through hole 21 .

<thickness>

The thickness of partition wall 30 is not particularly limited, but is usually 50 μm or more, preferably 100 μm or more, more preferably 150 μm or more, and usually 400 μm or less, preferably 300 μm or less, more preferably 200 μm or less. When the thickness of the partition wall 30 is more than the said lower limit, it becomes easy to raise the intensity|strength of the porous sheet 100. When the thickness of the partition walls 30 is not more than the above-mentioned upper limit, the increase in the weight of the porous sheet 100 can be suppressed, and the volume of the through-holes 21 can be easily ensured.

<height>

The height of the partition wall 30 is not particularly limited, but is usually 2 mm or more, preferably 5 mm or more, more preferably 10 mm or more, further preferably 15 mm or more, and usually 40 mm or less, preferably 30 mm or less, more preferably 25 mm or less, and even more preferably Below 20mm. When the height of the partition wall 30 is more than the said lower limit, it becomes easy to ensure the volume which accommodates soft feces in the porous sheet 100 inside. When the height of the partition wall 30 is equal to or less than the above-mentioned upper limit, it is easy to prevent the through-hole 21 from breaking midway and deforming the partition wall 30 when a load is applied from the outside. In addition, the ease of bending in the thickness direction of the porous sheet 100 as a whole is relatively improved, and the processability and fit feeling at the time of wearing tend to be improved.

In addition, the height of the partition wall 30 is generally substantially equal to the height of the thickness direction of the porous sheet 100 , that is, the thickness of the porous sheet 100 . In addition, the height of the partition wall 30 is generally substantially equal to the depth of the through hole 21 . That is, the thickness of the porous sheet 100 is not particularly limited, but is usually 2 mm or more, preferably 5 mm or more, more preferably 10 mm or more, further preferably 15 mm or more, and usually 40 mm or less, preferably 30 mm or less, more preferably 25 mm or less, More preferably, it is 20 mm or less. In addition, the depth of the through-hole 21 is not particularly limited, but it is usually 2 mm or more, preferably 5 mm or more, more preferably 10 mm or more, further preferably 15 mm or more, and usually 40 mm or less, preferably 30 mm or less, more preferably 25 mm or less, and further Preferably it is 20 mm or less.

<aperture>

The diameter of the through hole 21 is not particularly limited, but it is usually 0.5 mm or more, preferably 1 mm or more, more preferably 1.5 mm or more, further preferably 2 mm or more, and usually 10 mm or less, preferably 8 mm or less, more preferably 6 mm or less, More preferably, it is 5 mm or less, particularly preferably 4 mm or less. When the diameter of the through hole 21 is equal to or greater than the above-mentioned lower limit value, it is easy to secure a volume for accommodating soft feces in the porous sheet 100 . And it is easy to quickly incorporate soft feces into the inside of the through hole 21 . When the diameter of the through-holes 21 is not more than the above-mentioned upper limit, the decrease in the strength of the porous sheet 100 can be suppressed, and it is easy to prevent deformation when a force is applied from the outside. In addition, it is easy to hold soft feces in the through-hole 21 by functioning based on the capillary phenomenon.

<compressive strength>

In order to prevent deformation due to force applied by the wearer, the porous sheet 100 preferably has high strength against compression (compressive strength). For example, when a wearer who wears the absorbent article 300 including the porous sheet 100 sits with the porous sheet 100 on the lower part of the buttocks during use, or becomes in a supine position, the wearer's perception of the porous sheet 100 The load applied in the thickness direction increases. Therefore, in this specification, when referring to the strength against compression of the porous sheet 100, it means the compressive strength in the thickness direction. The compressive strength refers to the maximum stress when the porous sheet 100 undergoes buckling deformation or the porous sheet 100 is broken with respect to a compressive load applied in the thickness direction of the porous sheet 100 . The compressive strength is represented by a value obtained by dividing the maximum compressive load of the test piece applied to the porous sheet 100 by the cross-sectional area of the test piece. Specifically, the compressive strength in this specification is a value measured under the conditions described in Examples described later. The compressive strength of the porous sheet 100 is preferably 10 kPa or more, more preferably 20 kPa or more, even more preferably 30 kPa or more, and is preferably 2000 kPa or less, more preferably 1000 kPa or less, still more preferably 800 kPa or less. When the compressive strength is more than the above-mentioned lower limit value, by increasing the strength against compression in the thickness direction, it is difficult to undergo deformation when a load is applied, and it is easy to maintain soft feces inside. It is preferable from the viewpoint of cost that the compressive strength is not more than the above-mentioned upper limit.

In addition, the strength against compression of the porous sheet 100 can also be evaluated by its compression strength per unit density. The compressive strength per unit density is represented by the value obtained by dividing the compressive strength of the test piece of the porous sheet 100 by the density of the test piece. Specifically, the compressive strength per unit density in this specification is a value measured under the conditions described in Examples described later. The compressive strength per unit density of the porous sheet 100 is preferably 0.5 kPa/(kg/m ³ ) or more, more preferably 2 kPa/(kg/m ³ ) or more, still more preferably 5 kPa/(kg/m ³ ) or more, and preferably It is 100 kPa/(kg/m ³ ) or less, more preferably 80 kPa/(kg/m ³ ) or less, still more preferably 50 kPa/(kg/m ³ ) or less. When the compressive strength per unit density is more than the above-mentioned lower limit value, although the weight is light, the strength against compression tends to increase. In addition, in this case, the porosity occupied by the porous sheet 100 tends to increase, and the weight of the porous sheet 100 is suppressed, thereby improving the handling properties of the porous sheet 100 and increasing the amount of soft feces incorporated into the interior. quantity. It is preferable from the viewpoint of cost that the compressive strength per unit density is not more than the above-mentioned upper limit.

<porosity>

In the porous sheet 100 , it is preferable that the porosity is high in terms of easily taking soft feces into the through-holes 21 and improving the compressive strength per unit density. The porosity of the porous sheet 100 can be represented by the ratio of the total area of the openings of the through-holes 21 to the area of the porous sheet 100 in a plan view of the porous sheet 100 . Specifically, the porosity in this specification is a value measured under the conditions described in Examples described later. The porosity of the porous sheet 100 is preferably 30% or more, more preferably 50% or more, further preferably 75% or more, particularly preferably 90% or more, and is preferably 99% or less, more preferably 98% or less, and still more preferably 99% or less. 97% or less, particularly preferably 95% or less. When the porosity of the porous sheet 100 is equal to or higher than the above-mentioned lower limit value, the ratio occupied by the through-holes 21 increases, thereby increasing the internal volume for receiving loose stools in the through-holes 21 . In addition, it is easy to increase the compressive strength per unit density. When the porosity of the porous sheet 100 is not more than the above upper limit, it is easy to suppress the reduction in the strength of the partition walls 30 .

The shapes of the through holes 21 and the partition walls 30 of the porous sheet 100 are not particularly limited. From the viewpoint of strength and ease of manufacture, the porous sheet 100 preferably has a repeating structure in which cells 11a, 11b composed of through-holes 21 and partition walls 30 appear periodically in plan view. Specifically, it is preferable that the partition walls 30 surrounding the through holes 21 form a circular or polygonal repeating structure, and it is more preferable that the partition walls 30 form a polygonal honeycomb pattern in plan view (see FIGS. 3 and 4 ). Alternatively, it is preferable that the partition wall 30 has a corrugated pattern when viewed from above (see FIG. 5 and FIG. 6 ). These structures will be described in order. It should be noted that, in FIGS. 3 to 6 and later-described FIGS. 7 and 8, a perspective view of the porous sheet 100 (sheet body 10) and a cross-sectional view of the partition wall 30 are shown, but only the porous sheet 100 and the partition wall 30 are taken out. A portion of the repeating structure that has to be shown.

<Structure of honeycomb pattern>

As shown in FIGS. 3 and 4 , in the porous sheet 100 , the partition walls 30 preferably form a honeycomb pattern structure in which a plurality of polygonal cells 11 a having polygonal through-holes 21 a are assembled. That is, a honeycomb pattern structure is formed in which each partition wall 30 constitutes polygonal cells 11a in a cross-sectional structure. The cell 11a is constituted by a through-hole 21a and a plate-shaped cell wall 31 surrounding the through-hole 21a. Furthermore, the plurality of cells 11 a are adjacent to each other, and the adjacent cells 11 a are assembled so as to be in contact with the cell walls 31 between them, whereby the porous sheet 100 is formed. It should be noted that, in FIG. 4 , one of the chambers 11 a is shown surrounded by a two-dot chain line.

The shape of the cross-sectional view of the cells 11a is not particularly limited, and examples thereof include triangles, quadrangles, pentagons, and hexagons. Among them, regular triangles, squares, and regular hexagons are preferable, and regular hexagons are more preferable. The shape of the through-hole 21a in the cross-sectional view of the chamber 11a is compared with the shape of the cross-sectional view of the chamber 11a, and is formed in the same manner as the shape of the chamber 11a. For example, when the shape of the cell 11a is a regular hexagon, the shape of the through hole 21a is also a regular hexagon. When the shapes of the cells 11a and the through-holes 21a are regular hexagons, the strength of the partition wall 30 is improved by dispersing the force applied in the plane direction, and it is less likely to undergo deformation when an external force is applied. In this embodiment, the case where the cells 11a and the through-holes 21a have a regular hexagonal shape in cross-sectional view is exemplified.

The partition wall 30 is formed by laminating a plurality of base material portions 32 . The base portion 32 has a concavo-convex structure in the surface direction, and the concavo-convex structure is extended in the thickness direction. Adjacent base material portions 32 are in contact with each other in a positional relationship in which their convex portions face each other, and the bonding portion 33 is formed by adhering the surfaces. Adhesion can be performed using known adhesives such as starch, hot-melt type, synthetic resin emulsion type, and resin solution type, for example.

When the partition walls 30 constitute a honeycomb pattern structure, the diameter of the through-holes 21a can be represented by the diameter of a circle that is inscribed with the cell 11a and has the largest diameter. That is, the diameter of the through-hole 21a refers to the diameter of the inscribed circle of the cross-section of the through-hole 21a in plan view. As shown in FIG. 4, when the cell 11a is a regular hexagon, the diameter of the through hole 21a is expressed by the distance _L11 between the opposite sides of the cell 11a. In this case, the distance _L11 between the opposing sides is usually 0.1 mm or more, preferably 0.5 mm or more, more preferably 1 mm or more, still more preferably 1.5 mm or more, particularly preferably 2 mm or more, and usually 10 mm or less , preferably 6 mm or less, more preferably 5 mm or less, even more preferably 4 mm or less. In addition, in the case of the structure of a honeycomb pattern, the depth _D11 of the through-hole 21a can take the same numerical range as the height of the partition wall 30 mentioned above. _In addition, the ratio of the depth _D11 of the cell 11a to the distance L11 between the opposing sides can take the same numerical range as the above-mentioned ratio of the depth to the diameter of the through hole 21 .

<Manufacturing method in the case of having a honeycomb pattern structure>

When the partition walls 30 constitute the structure of the above-mentioned honeycomb pattern, the manufacturing method of the porous sheet 100 is not particularly limited, and a known manufacturing method of the honeycomb pattern structure can be used. For example, as a first manufacturing method, first, a planar sheet-shaped base material forming the partition wall 30 is formed into a concave-convex shape so as to form a hexagonal wall surface, thereby obtaining the base material part 32 . Next, an adhesive is applied on the protruding outer side of the convex portion provided on the base portion 32 . Furthermore, the plurality of base material parts 32 are bonded in a positional relationship in which the positions of the convex parts correspond to each other. Next, the bonded base portion 32 is cut in the plane direction so that the depth _D11 of the through hole 21a becomes a desired length, whereby a structure having a honeycomb pattern can be produced.

In addition, as the second manufacturing method, first, an adhesive is periodically applied to a position corresponding to the bonding portion 33 on the planar sheet-shaped base material forming the partition wall 30 . Next, a laminate in which the base materials are laminated is obtained by stacking and bonding the plurality of base materials coated with the adhesive agent to each other. Next, in this state, the laminate is cut so that the depth _D11 of the through-hole 21a becomes a desired length. In addition, this structure can be produced by expanding the space between the base materials and bonding the base materials with the adhesive part 33 to form the concave-convex shape of the base material part 32 and spreading the laminate.

It should be noted that these manufacturing methods can also be performed in combination. For example, a plurality of porous sheets 100 manufactured by the second manufacturing method may be bonded in a positional relationship in which the positions of the convex parts correspond to each other.

<Structure of the ripple pattern>

As shown in FIG. 5 and FIG. 6 , in the porous sheet 100 , the partition wall 30 preferably forms a corrugated pattern structure, and the corrugated pattern structure is composed of repetitions of corrugated groove-shaped parts 35 and flat-shaped liner parts 36 . The cell 11b is composed of a through-hole 21b and a plate-shaped cell wall 34 surrounding the through-hole 21b. The cell wall 34 is composed of a groove-shaped portion 35 and a liner portion 36 that is in contact with the groove-shaped portion 35 at an adhesive portion 37. constitute. And, the porous sheet 100 is formed by arranging a plurality of cells 11b adjacent to each other. It should be noted that, in FIG. 6 , one of the cells 11 b is shown surrounded by a two-dot chain line.

The partition wall 30 is formed by laminating a plurality of groove-shaped portions 35 and liner portions 36 alternately. At this time, the corrugated top of the groove-shaped portion 35 is in contact with the lining portion 36 (the lining portion is provided to face one side of the groove-shaped portion 35 ). In addition, the corrugated bottom of the groove-shaped portion 35 is in contact with the lining portion 36 (the lining portion is provided to face the other side of the groove-shaped portion 35 ). Then, the top and the bottom of the groove-shaped portion 35 are respectively bonded to the facing liner portion 36 , thereby forming the bonded portion 37 . Bonding can be performed using a known adhesive in the same manner as in the case of the structure of the honeycomb pattern.

When the partition wall 30 has a corrugated pattern structure, the bending ease of the porous sheet 100 shows anisotropy depending on the extending direction of the liner part 36 . That is, the direction perpendicular to the wall surface of the lining portion 36 (the up-and-down direction in FIG. 6 ) is more visible than the direction parallel to the wall surface of the lining portion 36 (the left-right direction in FIG. 6 ). Easy to bend characteristics. Therefore, the porous sheet 100 can be arranged so that the longitudinal direction of the disposable diaper 300 is perpendicular to the extending direction of the liner portion 36 . In this case, when the diaper 300 is deformed so that at least one of the front body 300A and the back body 300C stands up with the crotch portion 300B as the bottom, the porous sheet 100 tends to follow the length of the diaper 300 . The deformation of the direction is bent. Therefore, for example, when the wearer puts on the disposable diaper 300, the porous sheet 100 is likely to bend and deform in the longitudinal direction along the shape of the wearer's front body, crotch, and back. Thereby, the fit feeling is improved, and loose stools are easily taken in by following the wearer's skin surface in the longitudinal direction of the disposable diaper 300 . In addition, the porous sheet 100 may be arranged so that the longitudinal direction of the disposable diaper 300 is parallel to the extending direction of the liner portion 36 . In this case, the porous sheet 100 is likely to bend due to deformation in the width direction of the disposable diaper 300 . Therefore, for example, when the wearer puts on the disposable diaper 300, the porous sheet 100 is likely to bend and deform in the width direction along the shape of the wearer's crotch or buttock cleft. Thereby, the fit feeling is improved, and loose stools are easily taken in by following the wearer's skin surface in the width direction of the disposable diaper 300 .

In the case where the partition wall 30 has a corrugated pattern structure, as shown in FIG. 6 , the diameter of the through hole 21 b can be represented by the interval L ₂₁ of the liner portion 36 . In this case, the interval _L21 of the liner part 36 is usually 0.5 mm or more, preferably 1 mm or more, more preferably 1.5 mm or more, further preferably 2 mm or more, and usually 10 mm or less, preferably 6 mm or less, more preferably It is 5 mm or less, more preferably 4 mm or less. The interval _L21 between the plurality of liner portions 36 included in the partition wall 30 may be the same or different. On the other hand, the pitch L22 of the waves of the groove-shaped portion ₃₅ is usually 0.5 mm or more, preferably 1.5 mm or more, more preferably 2 mm or more, still more preferably 3 mm or more, and usually 20 mm or less, preferably 15 mm or less, more preferably It is preferably 10 mm or less, more preferably 8 mm or less, particularly preferably 6 mm or less. It should be noted that, in the case of the corrugated pattern structure, the depth D ₂₁ of the through-hole 21 b can take the same numerical range as the height of the partition wall 30 described above. In addition, the ratio of the depth D ₂₁ of the liner portion 36 to the interval L ₂₁ can take the same numerical range as the ratio of the depth of the through hole 21 to the hole diameter described above.

<Manufacturing method in the case of having a moire pattern structure>

When the partition walls 30 constitute the aforementioned corrugated pattern structure, the method for manufacturing the porous sheet 100 is not particularly limited, and a known method for manufacturing the corrugated pattern structure can be used. For example, as a third manufacturing method, first, the planar sheet-shaped base material forming the partition wall 30 is formed into a corrugated shape to obtain the groove-shaped portion 35 . Next, an adhesive is applied to the outside of the corrugated top of the groove portion 35 . Furthermore, a plurality of groove-shaped parts 35 and a plurality of liner parts 36 are alternately pasted. Next, this structure can be produced by cutting the groove-shaped portion 35 and the liner portion 36 after bonding in the planar direction so that the depth D ₂₁ of the through-hole 21 b becomes a desired length.

It should be noted that, in this embodiment, the case where the waveform periods of the plurality of groove-shaped parts 35 are consistent in plan view and are laminated according to the positional relationship in which the tops of the waveforms appear at the same position is exemplified, but the groove-shaped parts The positional relationship of 35 is not limited to this. In the plurality of groove-shaped portions 35, the positions of the waveforms may be periodically shifted or may be randomly shifted. For example, the waveforms of the groove-shaped portions 35 adjacent to each other via the liner portion 36 may be shifted by half a cycle, and stacked so that the tops and bottoms of the respective waveforms face each other.

[absorbent core]

The absorbent core 41 is a pad-shaped member that absorbs and holds liquid. As shown in FIG. 2 , the absorbent core 41 includes a superabsorbent polymer (SAP (Superabsorbent polymer), also referred to as a superabsorbent polymer or a superabsorbent resin) 42 and a fiber material 43 . The absorbent core 41 is formed by mixing a superabsorbent polymer 42 into a fibrous material 43 . The fiber material 43 is formed by winding hydrophilic ultrafine fibers. The superabsorbent polymer 42 is generally buried and held in the fibrous material 43 by being mixed with the fibrous material 43 . The superabsorbent polymer 42 is capable of absorbing and keeping liquid diffused by the fibrous material 43 .

<Super absorbent polymer>

As the superabsorbent polymer 42, various well-known materials used as the material of the absorber in absorbent articles such as disposable diapers and urine pads can be used. As the superabsorbent polymer 42, for example, starch-based acrylic acid (salt) graft copolymer, saponified product of starch-acrylonitrile copolymer, saponified product of starch-ethyl acrylate graft copolymer can be used; Cellulose-based products such as cross-linked products of cellulose sodium; synthetic polymer-based materials such as acrylic acid (salt) polymers and cross-linked products of polyvinyl alcohol-maleic anhydride reactants. These substances may be used alone or in combination of two or more. The shape of the superabsorbent polymer 42 is not particularly limited, and polymers in shapes such as granular, powdery, granular, sol, film, and fibrous shapes can be used, for example.

<fiber material>

As the fiber material 43, for example, cellulose-based fibers such as pulp fibers, rayon fibers, and cotton fibers are mentioned; synthetic fibers such as polyethylene, polypropylene, and polyethylene terephthalate are subjected to a hydrophilic treatment. s material. These materials may be used alone or in combination of two or more.

[absorber]

The absorber 40 is a mat-like or pad-like member having liquid absorption that absorbs and retains excreted water such as urine or menstrual blood excreted by the wearer. Among them, the absorber 40 of this embodiment can absorb the liquid component flowing out from the porous sheet 100 contained in the soft stool of the porous sheet 100 . As shown in FIG. 1 , the disposable diaper 300 incorporates the absorber 40 extending in the longitudinal direction through the front body 300A, the crotch portion 300B, and the rear body 300C. Here, the hourglass-shaped absorber 40 in which the width direction dimension of the crotch part 300B is smaller than 300 A of front parts and 300 C of back parts is shown as an example. The top view shape of the absorber 40 is not limited to the above-mentioned hourglass shape, and may be rectangular in plan view (that is, the dimension in the width direction is constant), or may be a dumbbell shape connecting the circular front body 300A and rear body 300C.

The absorber 40 has an absorptive core 41 and a wrapping sheet 44 . The absorber 40 is formed by covering the absorptive core 41 with the covering sheet 44 . The wrapping sheet 44 covers the entire absorptive core 41 including the skin-facing side (upper side in FIG. 2 ) and the skin-non-facing side (lower side in FIG. 2 ) of the absorptive core 41 .

<Wrap sheet>

The wrapping sheet 44 is a sheet-shaped member that wraps the absorptive core 41 . By covering the absorptive core 41 with the covering sheet 44, the fixability of the absorptive core 41 can be ensured.

The wrapper sheet 44 may be formed from known materials used in absorbent articles. Paper such as tissue paper can be used; Adhesive composite) non-woven fabrics, etc.

[laminated body]

The laminate 200 is a layer in which the top sheet 51 and the absorber 40 are arranged on both main surfaces of the porous sheet 100, and the back sheet 55 is provided on the surface of the absorber 40 opposite to the surface on which the porous sheet 100 is provided. product structure. Among them, the top sheet 51 is disposed on the skin-facing surface of the porous sheet 100 . In addition, the absorber 40 and the backsheet 55 are arranged on the surface of the porous sheet 100 on the side not facing the skin. The top sheet 51 and the porous sheet 100, the porous sheet 100 and the absorber 40, and the absorber 40 and the back sheet 55 can be respectively fixed by known adhesives such as hot-melt adhesives.

<top sheet>

The top sheet 51 is a sheet-like member arranged on the side most facing the skin in the laminate 200 . The top sheet 51 functions as a spacer provided between the wearer's skin surface and the porous sheet 100 . The top sheet 51 has a dimension in the width direction larger than the porous sheet 100 and the absorber 40, and covers the porous sheet 100 and the absorber 40 from the skin-facing side. In addition, when the diaper 300 is worn, the top sheet 51 is in contact with the wearer's skin, and allows excreted water to permeate and be absorbed by the absorbent body 40 . Therefore, at least a part or the whole of the top sheet 51 is comprised with the material which has water permeability. In addition, the top sheet 51 is preferably made of a material with high flexibility for the sake of fit when worn. In addition, in order to suppress the feeling of stuffiness in the worn state, it is preferable that the top sheet 51 is composed of a material that also has air permeability.

Moreover, as shown in FIG.1, FIG.2, the top sheet 51 has the passing part 52. As shown in FIG. The passing portion 52 allows excrement to pass through the top sheet 51 . Of the excrement, the passing portion 52 passes at least solid content. Specifically, it is possible to pass stool components that are solid components in soft stools. Needless to say, the passing portion 52 passes the liquid component as well as the solid component contained in the soft stool. That is, it is possible to pass feces and water together.

The passage portion 52 is formed by holes, slits, and the like provided in the top sheet 51 . Among these, it is preferable to provide holes in view of ease of passage of loose stools, and it is preferable to provide slits in view of reducing exposure of the porous sheet 100 and suppressing contact with the wearer's skin. In this embodiment, the case where a hole is provided as the passing part 52 is shown as an example.

The holes provided in the top sheet 51 are openings penetrating through the thickness direction provided by cutting or punching the top sheet 51 . The shape of the hole of the passage portion 52 is not particularly limited, and examples thereof include circular, elliptical, oblong, semicircular, polygonal, and amorphous shapes.

The slit provided in the top sheet 51 is a notch provided by cutting the top sheet 51 . The direction of the slit may be the longitudinal direction of the top sheet 51, may be a direction perpendicular to the longitudinal direction, or may be a direction inclined with respect to the longitudinal direction. In addition, the shape of the slit is not particularly limited, and may be linear, zigzag, or curved. When the diaper 300 is not worn, the slit is closed, and when the wearer wears the diaper 300, the top sheet 51 is deformed in a manner of being stretched in the surface direction, thereby expanding the slit and forming a gap for passing solid components. space.

The size of the holes or slits provided as the passing portion 52 is not particularly limited, but is usually 0.5 cm or more, preferably 1 cm or more, more preferably 1.5 cm or more, and usually 5 cm or less, preferably 3 cm or less, more preferably 2 cm or less. . When the size of the hole or the slit provided in the passage part 52 is more than the said lower limit value, it becomes easy to pass the solid content contained in excrement. When the size of the holes or slits in the passing portion 52 is below the above-mentioned upper limit, it is easy to suppress the reduction of the strength of the top sheet 51, and it is easy to suppress the wearer’s skin from contacting the porous sheet 100 through the passing portion 52. Decreased skin feel.

In this embodiment, the passage part 52 is arrange|positioned over the whole top sheet 51. The passing portion 52 is preferably disposed at least on the anus of the wearer or its periphery in the top sheet 51 . Thereby, the soft feces excreted from the anus can easily pass through the top sheet 51 . Moreover, it is preferable to provide the passing part 52 avoiding the peripheral part which is the outer periphery vicinity of the top sheet 51. As shown in FIG. In other words, the passing portion 52 is preferably provided in the center portion of the top sheet 51 or around the center portion. This can prevent feces passing through the top sheet 51 from leaking from the outer edge of the porous sheet 100 without being taken into the porous sheet 100 .

As a material which comprises the top sheet 51, a woven fabric, a nonwoven fabric, a porous film etc. can be used, for example. Alternatively, as the top sheet 51, fibers of thermoplastic resins such as polypropylene, polyethylene, polyester, and nylon may be hydrophilized to form a nonwoven fabric. As the nonwoven fabric constituting the top sheet 51, spunbonded nonwoven fabric, needle punched nonwoven fabric, spunlace (spunlace) nonwoven fabric, air-through nonwoven fabric, melt blown nonwoven fabric, SMS nonwoven fabric can be used. Cloth etc.

<back film>

The back sheet 55 is a sheet-like member arranged on the side most facing the skin non-facing side in the laminate 200 . The backsheet 55 is arranged on the side not facing the skin with respect to the absorber 40 to prevent excrement from leaking from the absorber 40 to the side not facing the skin. Therefore, the backsheet 55 is made of a water-impermeable material. In addition, in order to suppress stuffy feeling in the worn state, the back sheet 55 is preferably composed of a material having moisture permeability.

As a material constituting the back sheet 55, for example, a thermoplastic resin sheet such as polyethylene or polypropylene can be used. Among them, as the back sheet 55, a microporous thermoplastic resin sheet in which a plurality of fine pores of 0.1 to 0.4 μm is formed is preferably used. As such a sheet, for example, a sheet obtained by kneading an inorganic filler in a thermoplastic resin, forming a sheet, and stretching it after that can be used.

[side panels, cover panels]

The diaper 100 further includes a side sheet 61 and a cover sheet 62 laminated on the laminate 200 . The side sheet 61 is arranged on the side in the width direction of the laminate 200 . In addition, the cover sheet 62 is disposed on the side of the layered body 200 that does not face the skin. The side sheet 61, the cover sheet 62, and the laminate 200 can be fixed with a known adhesive such as a hot-melt adhesive.

<side panels>

The side panels 61 are members for forming three-dimensional gathers 71 on both sides of the laminate 200 . The side panels 61 are provided on the sides in the width direction of the panels 51, 55, respectively. The side sheet 61 is laminated on the skin-facing side of the widthwise side portion of the top sheet 51 , and is laminated on the skin-facing side of the widthwise side portion of the backsheet 55 .

In order to prevent liquid leakage laterally in the width direction, the side sheet 61 is preferably made of a water-impermeable material. As the side sheet 61, a spun-bonded nonwoven fabric can be used. Moreover, a part of the side sheet 61 is arrange|positioned at the most skin-facing surface side in the diaper 300 (the side sheet 61 is also called a "top sheet" similarly to the top sheet 51 based on this). As the side sheet 61 that can be in contact with the wearer like this, it is preferable to use a non-woven fabric such as SMS non-woven fabric or SMMS (Spunbound Meltblown Meltblown Spunbound, anti-sticking melt-blown anti-sticking compound) to make the softness by including the melt-blown layer. Improved spunbond nonwovens are obtained. Alternatively, it is preferable to use a spunbonded nonwoven fabric in which flexibility is improved by suppressing the fineness or basis weight of fibers forming the spunbonded nonwoven fabric.

In addition, "fineness" is a parameter corresponding to the fiber diameter (thickness) and cross-sectional area of a fiber, and is expressed by the weight per predetermined length. For example, for a fiber, grams per 9000 m (denier) is used as "fineness".

In addition, the "weight per unit area" is a parameter corresponding to the thickness of the sheet or the degree of lamination, and is represented by the weight per unit area. For example, the number of grams per square meter is used as "weight per unit area".

<mask>

The cover sheet 62 is a sheet-shaped member that covers the laminate 200 from the side that does not face the skin. The cover sheet 62 serves to reinforce the backsheet 55 and improve the texture (tactility) of the backsheet 55 by being disposed on the most skin-non-facing side of the diaper 300 . Here, the cover sheet 62 is superimposed on the side part of the back sheet 55 in the width direction via the side sheet 61 . As the cover sheet 62, three of the first cover sheet 63, the second cover sheet 64, and the third cover sheet 65 are laminated in this order from the skin-facing side toward the skin-non-facing side.

The 1st cover sheet 63 covers the absorber 40 from the skin non-facing side via the back sheet 55 (the 1st cover sheet 63 is also called a "pad sheet" based on this).

The second cover sheet 64 and the third cover sheet 65 are set larger than the first cover sheet 63 in the width direction dimension of the front body 300A and the back body 300C (see FIG. 1 ), and surround the wearer's buttocks, Waist, abdomen, etc. are configured. The third cover sheet 65 is disposed on the most skin-non-facing side in the diaper 300 (based on this, the third cover sheet 65 is also called an "outer cover sheet", and the second cover sheet 64 is also called an "inner cover sheet"). cover sheet").

As a material which comprises the cover sheet 62, a woven fabric, a nonwoven fabric, etc. are mentioned, for example. Among them, nonwoven fabrics and wet-laid nonwoven fabrics made of thermoplastic resins such as polyethylene, polypropylene, and polyester are preferably used. In particular, a spun-bonded nonwoven fabric can be suitably used as the cover sheet 62 from the viewpoint of securing a touch (touch) and flexibility.

As shown in FIG. 1 , the cover sheet 62 of the front body 300A and the cover sheet 62 of the rear body 300C have respective widthwise edge portions 62 a bonded to each other (so-called "side seal"). In this way, the cover sheets 62 of the front body 300A and the rear body 300C are continuously provided to form the underpants-type disposable diaper 300 .

[pleats]

Next, the gathers 70 of the diaper 300 will be described with reference to FIGS. 1 and 2 .

The gathers 70 are composed of a sheet composite in which a stretchable member (stretchable member) such as rubber, polyurethane, or a stretchable film is sandwiched between sheets such as nonwoven fabric in a stretched state and passed through the sheet composite body. It is fixed by hot melt or the like, thereby making it stretchable. The sheet composite is in a state where the nonwoven fabric or the like sheet has fine wrinkles due to the force (restoration force, elastic force) of the stretchable member returning from the stretched state to the original state (state of natural length). Here, a thread-like rubber member (hereinafter, simply referred to as "thread rubber") 80 is exemplified as the stretchable member.

In this paper diaper 300, as the gathers 70 formed of the thread rubber 80, three kinds of gathers 71, 72, and 73 provided with stretchability by three kinds of thread rubbers 81, 82, and 83 can be exemplified. One is three-dimensional gathers 71 (also referred to as “side gathers”) in which the edge portion of the side panel 61 on the skin-facing side is gathered by using the first thread rubber 81 . On the other hand, the second cover sheet 64 and the third cover sheet 65 (see FIG. 2 ) are provided with gathered belly gathers 72 by using the second thread rubber 82 (only one place is marked with a symbol). The other is the second three-dimensional gathers 73 (not shown in FIG. 1 ) that are wrinkled at the widthwise end edge of the side panel 61 on the non-skin-facing side using a third thread rubber 83 (not shown in FIG. 1 ). Show).

The three-dimensional gathers 71 are provided to prevent excrement from leaking laterally in the width direction by improving followability to the wearer around the excretion position. Specifically, as shown in FIG. 2, in the three-dimensional gathers 71, the sheet parts 61a and 61b located at the inner edge in the width direction of the skin-facing side of the side sheet 61 are folded and overlapped. The first thread rubber 81 extending in the longitudinal direction is surrounded by these pieces 61a, 61b.

The belly gathers 72 are provided to improve the followability to the wearer's buttocks and lower abdomen. Specifically, in the belly gather 72, a plurality of second thread rubbers 82 extending in the width direction are sandwiched between the second cover sheet 64 and the third cover sheet 65 (see FIG. )between.

The second three-dimensional gathers 73 are provided to improve followability in the crotch portion 300B. Specifically, in the second three-dimensional gathers 73 , the third thread rubber 83 is provided on the outer edge portion in the width direction of the side panel 61 on the side not facing the skin.

In addition to the gathers 71 , 72 , 73 described above or in place of the gathers 71 , 72 , 73 described above, leg gathers for improving followability to the wearer's thighs may be provided.

[Modification of the porous sheet]

In the above description, the case where the porous sheet 100 has the sheet main body 10 having the plate-like partition walls 30 constituting the honeycomb pattern structure and the through-holes 21a surrounded by the partition walls 30 has been formed as an example. . In addition, the case where the structure of the honeycomb pattern is a combination of through holes 21a and a plurality of cells 11a composed of plate-like cell walls 31 surrounding the through holes 21a has been described (see FIGS. 3 and 4 ). . In addition, the case where the porous sheet 100 has the partition wall 30 which comprises a corrugated pattern structure was taken as an example and demonstrated. The configuration of the porous sheet 100 is not limited thereto, and may be changed as appropriate as long as it has the partition walls 30 that define the through-holes 21 . For example, the partition walls 30 of the porous sheet 100 may have a core pattern structure in which a plurality of groove-shaped portions having a cylindrical repeating structure are laminated. Alternatively, as shown in Fig. 7 and Fig. 8, the partition wall 30 of the porous sheet 100 may constitute a structure in which a plurality of through-holes 21c and chambers 11c are assembled. The cell wall 31 of the thicker cell wall 38 is formed. It should be noted that, in FIGS. 7 and 8 , one of the chambers 11 c is shown surrounded by a two-dot chain line. This structure will be described below.

The shape of the cells 11c in the porous sheet 100 of this modified example is not particularly limited, and examples thereof include polygons such as triangles, quadrangles, pentagons, and hexagons. Among them, regular triangles, squares, and regular hexagons are preferable, squares and regular hexagons are more preferable, and regular hexagons are still more preferable. When the shape of the cells 11c is polygonal, the same pattern structure as the honeycomb pattern described in the embodiment is formed. It should be noted that the shape of the hole chamber 11c may also be a random shape. In this case, the through-holes 21c may be provided in random sizes and positions.

The shape of the through-hole 21c in the cross-sectional view of the chamber 11c is not particularly limited, and examples thereof include polygons such as circles, ellipses, oblongs, triangles, quadrangles, pentagons, and hexagons. Among them, a circle, a square, and a regular hexagon are preferable. From the viewpoint of increasing the porosity of the porous sheet 100 and increasing the volume of the through-holes 21c, the shape of the through-holes 21c in cross-sectional view is preferably formed corresponding to the shape of the cells 11c in a cross-sectional view. For example, when the shape of the cell 11c is a regular hexagon, it is preferable that the shape of the through hole 21c is also a regular hexagon. Alternatively, when the shape of the cell 11c is a square, it is preferable that the shape of the through hole 21c is also a square. On the other hand, from the viewpoint of increasing the strength of the porous sheet 100 by increasing the thickness of the partition wall 30, the shape of the through hole 21c in a cross-sectional view may be circular. In this modified example, the case where the cells 11 c have a regular hexagonal shape when viewed in cross section and the case where the through hole 21 c has a circular shape when viewed in cross section is exemplified.

<porosity>

The porosity of the porous sheet 100 of the modified example is preferably 50% or more, more preferably 60% or more, further preferably 70% or more, particularly preferably 75% or more, and is preferably 95% or less, more preferably 90% or less, It is more preferably 85% or less, particularly preferably 80% or less. When the porosity of the porous sheet 100 is equal to or greater than the above-mentioned lower limit value, it is easy to secure an internal volume for taking soft stools into the through-holes 21c. In addition, the porous sheet 100 is easily deformed by bending. When the porosity of the porous sheet 100 is below the upper limit, the rigidity of the partition wall 30 increases, and the strength against strain or deformation tends to increase.

Compared with the embodiment in which a plurality of cells 11a composed of plate-shaped cell walls 31 are assembled, in the porous sheet 100 of the modified example, the thickness of the cell walls 38 is relatively increased, thereby improving the performance. The strength against external force is preferred from this aspect. On the other hand, from the viewpoint of reducing the weight of the porous sheet 100, increasing the volume of the through-holes 21, and improving the workability and fitting feeling due to the ease of bending in the thickness direction, it is preferable to use a plate-shaped cell wall. 31 composed of a plurality of chambers 11a set together. In addition, from the viewpoint of increasing the compressive strength per unit density, it is preferable to assemble a plurality of cells 11 a constituted by plate-shaped cell walls 31 .

<Manufacturing method>

When the partition wall 30 has the above structure, the method of manufacturing the porous sheet 100 of the modified example is not particularly limited, and a known manufacturing method can be used. For example, as a fourth manufacturing method, it is possible to manufacture as follows: For a block member having a thickness corresponding to the depth _D31 of the through-hole 21c, the through-hole 21c is provided by cutting with a punching machine or the like, or the through-hole 21c is provided using a punching machine. A porous sheet is produced by perforating with a laser or the like to provide the through-holes 21c.

In addition, as a fifth manufacturing method, first, pulp, thermoplastic resin, fiber, etc., which are raw materials such as paper, synthetic paper, synthetic resin, cloth, etc. constituting the partition wall 30, are supplied to an inner wall having a plurality of shapes corresponding to the through-holes 21c. The columnar protrusions are inside the template inner container. Next, an aggregate formed by molding the raw materials in the template inner container is obtained by heat treatment, drying treatment, etc. of the template inner container. Furthermore, the molded assembly is taken out of the template inner container, and cut so that the depth _D31 of the through-hole 21c becomes a desired length, whereby a porous sheet can be produced.

[Second Embodiment]

Next, the configurations of the porous stool receiving sheet 100 and the disposable diaper 300 according to the second embodiment will be described with reference to FIGS. 9 to 13 . The configuration of the disposable diaper 300 of the second embodiment is the same as that of the disposable diaper 300 of the first embodiment except for the configuration of the porous sheet 100 . Therefore, in the following description of the second embodiment, the porous sheet 100 of the second embodiment is focused on the configuration different from the porous sheet 100 of the first embodiment, and the elements already described with reference to FIGS. 1 to 8 are as follows: The same reference numerals as those in FIGS. 1 to 8 are assigned, and descriptions thereof are appropriately omitted.

[porous sheet]

Like the first embodiment, the porous sheet 100 of the second embodiment is a sheet-like member that contains soft stools inside and prevents the soft stools from spreading in the lateral direction (surface direction), and can be positioned as a porous sheet for containing soft stools. . The structure of the porous sheet 100 of the second embodiment differs from the first embodiment mainly in the point of having permeable holes 22 described later, and the other basic structures are the same as those of the first embodiment, and the first embodiment is used here. The description of <Basic Structure of Porous Sheet> in , and its detailed description is omitted.

<through hole>

Fig. 9 is a cross-sectional view of a disposable diaper 300 according to the second embodiment, which is a cross-sectional view viewed from the arrow II-II of Fig. 1 . As shown in FIG. 9 , the porous sheet 100 has permeation holes 22 on the side surfaces of the partition walls 30 . The permeation hole 22 penetrates the partition wall 30 and communicates with the adjacent through-holes 21 , and at the same time allows moisture to pass through between the adjacent through-holes 21 . The moisture mentioned here includes, for example, liquid components contained in urine or soft stools. The permeable hole 22 preferably allows at least liquid moisture to permeate. In addition, the permeation holes 22 may transmit not only liquid moisture but also gaseous moisture (water vapor). By having the permeation holes 22 , the moisture taken into the porous sheet 100 can pass through the permeation holes 22 and permeate the partition walls 30 . As a result, moisture spreads into the adjacent through holes 21 and diffuses in the porous sheet 100 . It should be noted that the permeable holes 22 can permeate not only water but also solid components contained in soft stools. However, the size of such permeable holes 22 is relatively large, and the area occupied by the partition wall 30 tends to increase. In this case, the strength of the partition wall 30 may decrease. Therefore, the permeable hole 22 generally only needs to allow at least moisture to permeate.

The installation position of the penetration hole 22 is not particularly limited, and it is preferably provided not in the partition wall 30 located on the outermost wall of the sheet body 10 but in the partition wall 30 located inside the sheet body 10 . As a result, moisture is allowed to pass through the permeable holes 22 provided inside the sheet body 10 , so that the moisture can spread between the adjacent through holes 21 inside the sheet body 10 . In addition, moisture can be prevented from flowing out from the side surface of the porous sheet 100 through the permeation holes 22 provided on the side surface of the sheet main body 10 . Therefore, the moisture that has flowed in from the end surface 10 a of the porous sheet 100 and diffused in the porous sheet 100 can flow out from the end surface 10 b side of the porous sheet 100 . In addition, the absorber 40 provided on the non-skin-facing surface side of the porous sheet 100 allows moisture flowing out of the porous sheet 100 to pass through the end surface 10b and be immediately absorbed.

The shape of the transmission hole 22 is not particularly limited, and examples thereof include a circle, an ellipse, an oblong shape, a semicircle, a polygon, and an amorphous shape. Alternatively, the partition wall 30 may have a porous structure having a plurality of voids communicating with the partition wall 30 inside, and the voids may function as the through holes 22 . In addition, the number of transmission holes 22 provided in the partition wall 30 is not particularly limited, and may be changed as appropriate as long as the transmission hole ratio described later is satisfied.

The diameter of the transmission hole 22 is not particularly limited, but is preferably 0.1 mm or more, more preferably 0.5 mm or more, preferably 3 mm or less, more preferably 1 mm or less. When the diameter of the permeation hole 22 is equal to or larger than the above-mentioned lower limit value, it is easy for moisture to pass through the permeation hole 22 and permeate the partition wall 30 . When the diameter of the transmission hole 22 is not more than the above-mentioned upper limit, it is easy to prevent a reduction in the strength of the partition wall 30 . It should be noted that the diameter of the transmission hole 22 refers to the diameter of a circle (inscribed circle) inscribed with the transmission hole 22 .

The degree of the transmission holes 22 provided in the partition wall 30 can be expressed by the ratio of the total opening area of the transmission holes 22 to the area of the partition wall 30 (transmission porosity). The permeation porosity of the porous sheet 100 is preferably 10% or more, more preferably 20% or more, preferably 50% or less, more preferably 30% or less. When the transmission porosity is equal to or greater than the above-mentioned lower limit value, it is easy for moisture to pass through the partition walls 30 through the transmission holes 22 . When the transmission porosity is equal to or less than the above-mentioned upper limit, it is easy to prevent a reduction in the strength of the partition wall 30 .

<Material of porous sheet>

As a material which comprises the porous sheet 100, similarly to 1st Embodiment, paper, synthetic paper, synthetic resin, a nonwoven fabric, etc. are mentioned, for example. Preferred main components, raw materials, production methods, paper weight, basis weight, etc. of these materials refer to the description of <Material of Porous Sheet> in the first embodiment, and a detailed description thereof is omitted.

<Ratio of depth to aperture>

In the porous sheet 100 of the second embodiment, the depth of the through holes 21 is preferably larger than the diameter of the holes. That is, the ratio of the depth to the diameter of the through hole 21 (aspect ratio) is preferably greater than 1. Regarding the preferred numerical range as the ratio of the depth to the diameter of the through-hole 21 , the description of <ratio of the depth to the diameter of the hole> in the first embodiment is referred to, and a detailed description thereof is omitted.

<thickness, height, aperture>

The thickness of the partition wall 30, the height of the partition wall 30, and the diameter of the through-hole 21 are not particularly limited, and the description of <thickness>, the description of <height>, and the description of <aperture> in the first embodiment are cited for their preferred numerical ranges. and omit its detailed description.

<compressive strength>

In the porous sheet 100 , as in the first embodiment, in order to prevent deformation due to force applied by the wearer, it is preferable that the strength against compression (compression strength) be high. Regarding the compressive strength of the porous sheet 100 and the preferred numerical ranges of the compressive strength per unit density, the description of <compressive strength> in the first embodiment is used, and the detailed description thereof is omitted.

<porosity>

In the porous sheet 100 , as in the first embodiment, it is preferable that the porosity is high from the viewpoint of making it easy to take soft feces into the through-holes 21 and improving the compressive strength per unit density. Regarding the preferable numerical range of the porosity of the porous sheet 100 , the description of <porosity> in the first embodiment is referred to, and a detailed description thereof is omitted.

Like the first embodiment, the porous sheet 100 preferably has a repeating structure in which the cells 11a, 11b composed of the through-holes 21 and the partition walls 30 appear periodically in plan view from the viewpoint of strength and ease of manufacture. . Specifically, the partition wall 30 surrounding the through hole 21 preferably forms a circular or polygonal repeating structure, and more preferably forms a honeycomb pattern structure similar to that shown in FIGS. 3 and 4 of the first embodiment (see FIGS. 10 and 11 ). Alternatively, it is preferable that the partition wall 30 surrounding the through-hole 21 has a corrugated pattern structure similar to that shown in FIGS. 5 and 6 of the first embodiment (see FIGS. 12 and 13 ). Their structures will be described in turn. 10 to 13 show a perspective view of the porous sheet 100 (sheet body 10 ) and a cross-sectional view of the partition wall 30 , but only a part of the repeating structure of the porous sheet 100 and the partition wall 30 is shown.

<Structure of honeycomb pattern>

As shown in FIGS. 10 and 11 , in the porous sheet 100 , the partition walls 30 preferably form a honeycomb pattern structure in which a plurality of polygonal cells 11 a having polygonal through-holes 21 a are assembled. Components of the honeycomb pattern structure shown in FIGS. 10 and 11 and preferred shapes of the cells 11 a are referred to in the description of <Structure of the Honeycomb Pattern> in the first embodiment, and detailed description thereof is omitted.

As shown in FIGS. 10 and 11 , the partition wall 30 is formed by laminating a plurality of base material portions 32 . In the second embodiment, the substrate portion 32 repeatedly has a concavo-convex structure in which the first parallel portion 32a, the first slope portion 32b, the second parallel portion 32c, and the second slope portion 32d are sequentially continuous in the plane direction. The first parallel portion 32a, the first slope portion 32b, the second parallel portion 32c, and the second slope portion 32d all have substantially the same length. The first parallel portion 32 a and the second parallel portion 32 c are parallel to each other and also parallel to the extending direction of the base portion 32 . The first slope portion 32b, the second parallel portion 32c, and the second slope portion 32d sequentially form the shape of sides other than the base of an isosceles trapezoid whose interior angles of the bases are all 60 degrees. In addition, the second slope portion 32d, the first parallel portion 32a, and the first slope portion 32b sequentially form the shape of sides other than the base of an isosceles trapezoid whose interior angles of the bases are all 60 degrees. And, by repeating these shapes alternately, a concavo-convex structure is formed. In the base material part 32, the above-mentioned concavo-convex structure extends in the thickness direction. In addition, adjacent base material portions 32 are in contact with each other in a positional relationship in which the first parallel portion 32a or the second parallel portion 32c forming the convex portion faces each other, and the bonding portion 33 is formed by bonding the surfaces. Adhesion can be performed using known adhesives such as starch, hot-melt type, synthetic resin emulsion type, and resin solution type, for example.

When the partition walls 30 constitute a honeycomb pattern structure and the cells 11a are regular hexagons, the diameter of the through-holes 21a is represented by the interval _L11 between the opposite sides of the cells 11a. As the preferred numerical range of the interval L ₁₁ between the opposing sides of the cell 11a, the depth D _{11 of the through hole 21a, and the ratio of the depth D 11 of} the cell 11a to the interval L ₁₁ between the opposing sides and the first It is the same as in the embodiment, and the above-mentioned description is used and its detailed description is omitted.

In the second embodiment, the permeation holes 22a are respectively provided on two opposing sides of the cell 11a formed by the first parallel portion 32a and the second parallel portion 32c. In addition, permeation holes 22b and 22c are respectively provided on two sets of opposing sides formed by the first slope portion 32b and the second slope portion 32d of the hole chamber 11a. Thereby, the water|moisture content in the through-hole 21a can be circulated to the through-hole 21a of the adjacent cell chamber 11a through the permeation holes 22a-22c. In this case, in FIG. 11 , moisture can flow between the cells 11 a adjacent in the vertical direction and the cells 11 a adjacent in the horizontal oblique direction through the permeable holes 22 a to 22 c. In this case, the porous sheet 100 can disperse the moisture in the through-holes 21a throughout the porous sheet 100 in a well-balanced manner.

The through hole 22 is not limited to the form of providing the through holes 22 a to 22 c described with reference to FIGS. 10 and 11 , and may be changed as appropriate. For example, among the transmission holes 22a to 22c, only any one set of the transmission holes 22 facing each other may be provided without providing the other two sets. As an example, only the penetration hole 22a may be provided without the penetration holes 22b and 22c. In this case, in FIG. 11 , water can be passed through the permeable holes 22 a to flow between the vertically adjacent cells 11 a. In this way, by providing the permeation holes 22 only in the partition walls 30 on one side facing each other between the adjacent cells 11a, the permeation of water can be directional. At this time, for example, the porous sheet 100 provided with only the through holes 22a may be arranged so that the vertical direction of the porous sheet 100 in FIG. 11 is parallel to the longitudinal direction of the disposable diaper 300 . In this case, the porous sheet 100 can guide the moisture in the through holes 21 a in the longitudinal direction of the disposable diaper 300 . Thereby, for example, the moisture taken in the porous sheet 100 near the crotch portion 300B can be diffused in the longitudinal direction of the front body 300A or the rear body 300C.

<Manufacturing method in the case of having a honeycomb pattern structure>

When the partition walls 30 constitute the structure of the above-mentioned honeycomb pattern, the first manufacturing method or the second manufacturing method described in the first embodiment can be applied as the manufacturing method of the porous sheet 100 . In the case of applying the first manufacturing method, when obtaining the concave-convex shaped base portion 32, the base portion 32 may be punched with a punch or a laser to form the through holes 22a to 22c. In the case of applying the second manufacturing method, in the case of obtaining a laminate in which substrates are laminated, for example, the substrate part 32 may be cut using a punch or the like, or the substrate portion 32 may be cut using a punch or a laser. The base material portion 32 is perforated, whereby the penetration holes 22a to 22c are provided.

<Moiré pattern structure>

As shown in FIG. 12 and FIG. 13 , in the porous sheet 100 , the partition wall 30 preferably has a corrugated pattern structure composed of repetitions of corrugated groove portions 35 and flat plate liner portions 36 . The cell 11b is composed of a through-hole 21b and a plate-shaped cell wall 34 surrounding the through-hole 21b. The cell wall 34 is composed of a groove-shaped portion 35 and a liner portion 36 connected to the groove-shaped portion 35 at an adhesive portion 37 . And, the porous sheet 100 is formed by arranging a plurality of cells 11b adjacent to each other. It should be noted that, in FIG. 13 , one of the chambers 11 b is shown surrounded by a two-dot chain line.

The partition wall 30 is formed by laminating a plurality of groove-shaped portions 35 and liner portions 36 alternately. The groove-shaped portion 35 repeatedly has a wave structure in which a top portion 35a, a first middle portion 35b, a bottom portion 35c, and a second middle portion 35d are sequentially continuous in the plane direction. In the groove portion 35, the wave structure is extended along the thickness direction. The liner portion 36 is a flat plate member. At this time, the corrugated apex 35 a of the groove-shaped portion 35 is in contact with the liner portion 36 provided opposite to one side of the groove-shaped portion 35 . Moreover, the corrugated bottom part 35c of the groove-shaped part 35 is in contact with the liner part 36 provided opposite to the other side of the groove-shaped part 35. As shown in FIG. Then, the top 35 a and the bottom 35 c of the groove-shaped portion 35 are respectively bonded to the facing liner portion 36 , thereby forming the bonded portion 37 . As in the case of the structure of the honeycomb pattern, bonding can be performed using a known adhesive.

When the partition wall 30 has a corrugated pattern structure, the bending ease of the porous sheet 100 shows anisotropy depending on the extending direction of the liner part 36 . The relationship between the ease of bending of the porous sheet 100 and the extending direction of the liner portion 36 is the same as those in the first embodiment, and the above description is referred to and detailed description thereof is omitted.

In the case where the partition wall 30 has a corrugated pattern structure, as shown in FIG. 13 , the diameter of the through hole 21b can be represented by the interval L ₂₁ of the liner portion 36 . In this case, as the preferred numerical range of the interval L ₂₁ of the liner portion 36, the pitch L ₂₂ of the corrugation of the groove portion 35, the depth D ₂₁ of the through hole 21b, and the depth D ₂₁ of the liner portion 36 with respect to the interval The ratio of L to ₂₁ is the same as that in the first embodiment, and the above-mentioned description is used and a detailed description thereof is omitted.

In the second embodiment, in the groove-shaped portion 35 of the cell 11b, the penetration hole 22d is provided in the first intermediate portion 35b, and the penetration hole 22e is provided in the second intermediate portion 35d. In addition, a permeation hole 22f is provided in the liner portion 36 of the cell 11b. Thereby, the moisture in the through-hole 21b can be made to flow through the through-hole 21b of the adjacent cell 11b through the permeation hole 22d-f. In this case, in FIG. 13 , moisture can flow between the cells 11 b adjacent in the vertical oblique direction and the cells 11 b adjacent in the horizontal direction through the permeable holes 22 d to 22 f . In this case, the porous sheet 100 can disperse the moisture in the through-holes 21 b in the entire porous sheet 100 in a well-balanced manner.

The through hole 22 is not limited to the form of providing the through holes 22d to 22f described with reference to FIGS. 12 and 13 , and may be changed as appropriate. For example, among the penetration holes 22 d to 22 f , the penetration holes 22 d and 22 e may be provided only in the groove portion 35 , and the penetration hole 22 f may not be provided in the liner portion 36 . In this case, in FIG. 13 , moisture can flow between the cells 11 b adjacent in the left-right direction through the permeable holes 22 d and 22 e . Thus, by providing the permeation holes 22d and 22e only in the partition wall 30 constituting the groove-shaped portion 35 between the adjacent cells 11b, the permeation of water can be directional. In this case, for example, the porous sheet 100 having only the through holes 22d and 22e may be arranged so that the left-right direction of the porous sheet 100 in FIG. 13 is parallel to the longitudinal direction of the disposable diaper 300 . In this case, the porous sheet 100 can guide the moisture in the through-holes 21 b in the longitudinal direction of the disposable diaper 300 . Thereby, for example, the moisture taken in the porous sheet 100 near the crotch portion 300B can be diffused in the longitudinal direction of the front body 300A or the rear body 300C.

<Manufacturing method in the case of having a moire pattern structure>

When the partition walls 30 constitute the above-mentioned corrugated pattern structure, the third manufacturing method described in the first embodiment can be applied as the manufacturing method of the porous sheet 100 . In the case of applying the third manufacturing method, when the planar sheet-shaped base material forming the partition wall 30 is formed into a corrugated shape to obtain the groove-shaped portion 35, the groove-shaped portion 35 can be perforated by using, for example, a punching machine or a laser. The through holes 22d to 22f are provided.

It should be noted that, in this embodiment, the case where the waveform periods of the plurality of groove-shaped portions 35 are consistent in plan view and laminated according to the positional relationship in which the tops of the waveforms appear at the same position is illustrated, but the groove-shaped portions The positional relationship of 35 is not limited to this. In the plurality of groove-shaped portions 35, the positions of the waveforms may be periodically shifted or may be randomly shifted. For example, the waveforms of the groove-shaped portions 35 adjacent to each other via the liner portion 36 may be shifted by half a cycle, and stacked so that the tops and bottoms of the respective waveforms face each other.

In the second embodiment, the absorbent core 41, the superabsorbent polymer 42, the fiber material 43, the absorbent body 40, the wrapping sheet 44, the laminate 200, the top sheet 51, the passing portion 52, the back sheet 55, and the side sheets 61, the cover sheet 62, and the respective constituent elements of the gathers 70 can be configured in the same manner as the corresponding elements described in the first embodiment, and the above description is referred to and detailed description thereof is omitted.

[About the aperture and arrangement of through holes]

In the above description, the case where the transmission holes 22 having the same diameter are arranged as an example has been described. The diameter of the permeation holes 22 is not limited thereto, and the diameters of the permeation holes 22 included in one porous sheet 100 may be different from each other, and the diameters may be changed according to positions in the porous sheet 100 . In addition, the arrangement of the permeable holes 22 may not be uniform, and the distribution of the permeable holes 22 may be changed according to the positions in the porous sheet 100 . For example, the transmission porosity contained in a part of the area may be increased, or the transmission porosity contained in a part of the area may be decreased.

[Modification of the porous sheet]

In the above description, the case where the porous sheet 100 has the plate-shaped partition walls 30 constituting the honeycomb pattern structure was taken as an example and described. The case where the porous sheet 100 has the partition walls 30 constituting the corrugated pattern structure is also taken as an example and described. The configuration of the porous sheet 100 is not limited thereto, and may be changed as appropriate as long as it has the partition walls 30 that define the through-holes 21 . For example, the partition walls 30 of the porous sheet 100 may have a structure of a roll core pattern in which a plurality of groove-shaped portions having a cylindrical repeating structure are laminated.

[Third Embodiment]

Next, configurations of the porous stool sheet 100 and the disposable diaper 300 in the third embodiment will be described with reference to FIGS. 14 to 20 . The laminate 200 in the paper diaper 300 of the first embodiment includes the absorber 40 (see FIG. In the diaper 300, the laminate 200 is provided with a support sheet 54 provided on the end surface 10b side as the other main surface of the porous sheet 100 instead of the absorber 40 (see FIG. 1 ). The configuration of the diaper 300 of the first embodiment is the same as that of the diaper 300 of the first embodiment except for the configuration of the porous sheet 100, so the elements already described with reference to FIGS. The same symbols are used and their descriptions are omitted appropriately.

[porous sheet]

Like the first embodiment, the porous sheet 100 in the third embodiment is a sheet-like member that contains soft stools inside and prevents soft stools from spreading in the lateral direction (surface direction), and can be positioned as a porous sheet for soft stools. piece. In addition, in the third embodiment, the porous sheet 100 is a liquid-absorbent member capable of absorbing and retaining excreted water such as urine or menstrual blood excreted by the wearer. In the configuration of the porous sheet 100 of the third embodiment, it is mainly different from the first embodiment in that the partition wall 30 has a superabsorbent polymer 42, and the other basic configurations are the same as those of the first embodiment. The description of <Basic Configuration of Porous Sheet> will be omitted, and its detailed description will be omitted.

As shown in FIGS. 15 to 18 , the partition wall 30 contains (attaches) a superabsorbent polymer 42 (SAP (Superabsorbent polymer), also referred to as a superabsorbent polymer or a superabsorbent resin) which will be described later. The superabsorbent polymer 42 is capable of absorbing and retaining liquid incorporated into the porous sheet 100 .

The content of the superabsorbent polymer 42 in the partition wall 30 is usually 1% by mass or more, preferably 5% by mass or more, more preferably 10% by mass or more, and still more preferably 15% by mass in terms of solid content relative to the total mass of the partition wall 30. Mass % or more, usually 50 mass % or less, preferably 40 mass % or less, more preferably 30 mass % or less, still more preferably 20 mass % or less. When content of the superabsorbent polymer 42 is more than the said minimum, it becomes easy to suppress the leakage to the exterior of the porous sheet 100 by absorbing and holding|maintaining the liquid in the porous sheet 100. When content of the superabsorbent polymer 42 is below the said upper limit, it becomes easy to suppress that the through-hole 21 becomes narrow or closed by the excess superabsorbent polymer 42 at the time of water absorption. In addition, it is easy to suppress the reduction of the strength of the partition wall 30 .

The partition wall 30 may further contain a fiber material (illustration omitted) which will be described later. Fibrous materials are formed by winding extremely fine fibers with hydrophilic properties. When the partition wall 30 contains a fibrous material, the superabsorbent polymer 42 is mixed with the fibrous material to be buried and held in the fibrous material. Fibrous materials generally absorb faster than superabsorbent polymers42. On the other hand, the absorbency of the superabsorbent polymer 42 , that is, the amount of liquid absorbed is superior to that of the fibrous material. Therefore, by making the partition wall 30 contain the fibrous material, the liquid can be temporarily absorbed into the partition wall 30 by the fibrous material first. In addition, the superabsorbent polymer 42 is capable of slowly absorbing and retaining liquid absorbed by the fibrous material.

The content of the fibrous material in the partition wall 30 is usually 5% by mass or more, preferably 10% by mass or more, more preferably 15% by mass or more, and even more preferably 20% by mass or more in terms of solid content relative to the total mass of the partition wall 30, Usually, it is 60 mass % or less, Preferably it is 50 mass % or less, More preferably, it is 40 mass % or less, More preferably, it is 30 mass % or less. When content of a fibrous material is more than the said minimum, it becomes easy to rapidly absorb the liquid contained in the porous sheet 100. When the content of the fibrous material is not more than the above upper limit, it is easy to suppress the through-hole 21 from being narrowed or closed due to an excessive amount of the fibrous material. In addition, it is easy to suppress the reduction of the strength of the partition wall 30 .

In the porous sheet 100, the manner in which the superabsorbent polymer 42 and/or fibrous material is contained in the partition wall 30 is not particularly limited. For example, as shown in FIGS. The superabsorbent polymer 42 and fibrous material may exist on the surface of the partition wall 30, or may be combined. In the latter case, the superabsorbent polymer 42 and the fibrous material are preferably present in a state in which a part thereof is exposed on the surface of the partition wall. In the former case, for example, after the sheet body 10 is formed, an adhesive is applied to the sheet body 10, and the superabsorbent polymer 42 or fiber material is attached to the sheet body 10 with the adhesive, thereby performing fixed. In addition, in the latter case, for example, when the sheet body 10 is formed, the superabsorbent polymer 42 and the fiber material may be mixed in advance with the material of the sheet body to form the sheet body 10 for fixing. The adhesive used for fixing the superabsorbent polymer 42 and the fiber material is not particularly limited, and known adhesives such as starch, hot-melt type, synthetic resin emulsion type, and resin solution type can be used. Among them, a water-based adhesive in which a hydrophilic adhesive component is dissolved or dispersed in water is preferable. Examples of such adhesive components include polyvinyl alcohol-based resins.

In addition, the shape of the porous sheet 100 in the third embodiment is not particularly limited as long as it has a size and a shape that can accommodate loose stool excreted by the wearer, as in the first embodiment. In the third embodiment, the porous sheet 100 extends in the longitudinal direction through the front body 300A, the crotch portion 300B, and the rear body 300C. Here, the hourglass-shaped porous sheet 100 is exemplified in which the crotch portion 300B has a smaller dimension in the width direction than the front body 300A and the rear body 300C. In the third embodiment, the porous sheet 100 has substantially the same shape as the support sheet 54 described later. Thus, by making the porous sheet 100 and the support sheet 54 substantially the same shape as the hourglass, the porous sheet 100 can cover the region including the front body 300A, the crotch portion 300B, and the rear body 300C. And, the porous sheet 100 can block the excrement excreted in these regions, thereby preventing the excrement from leaking out of the diaper 300 . In addition, by providing the porous sheet 100 on the supporting sheet 54, when the porous sheet 100 takes in soft feces from the one end surface 10a side of the through hole 21, the supporting sheet 54 exists on the other end surface 10b side. Therefore, the supporting sheet 54 functions as a stopper on the end surface 10b side, and can prevent the soft feces contained in the through hole 21 from passing through the through hole 21 and directly flowing out from the end surface 10b to pass through the porous sheet 100 . In addition, the support sheet 54 allows the solid content of the soft stool to stay inside the through-hole 21, and at the same time allows the liquid component contained in the soft stool taken into the inside of the through-hole 21 to be absorbed through the end surface 10b. Wherein, the top view shape of the porous sheet 100 is not limited to the hourglass shape, for example, it can also be circular, elliptical, oblong, rectangular (that is, the dimension in the width direction is constant), connecting the circular front body 300A and the rear body 300C dumbbell shape etc. The porous sheet 100 is preferably shaped smaller than the support sheet 54 so that the support sheet 54 functions as a stopper on the side of the end surface 10b and absorbs the liquid component through the end surface 10b. In addition, the porous sheet 100 is preferably disposed at least at the anus of the wearer.

<through hole>

Like the first embodiment, the porous sheet 100 may have permeation holes (illustration omitted) penetrating the partition walls 30 on the side surfaces of the partition walls 30 . In the third embodiment, the superabsorbent polymer 42 contained in the partition wall 30 (here, as shown in FIGS. By absorbing the diffused liquid components, the liquid components can be quickly absorbed over a wider area.

<Material of porous sheet>

As a material which comprises the porous sheet 100, paper, a synthetic paper, a synthetic resin, a nonwoven fabric etc. are mentioned, for example. Preferred main components, raw materials, production methods, paper weight, basis weight, etc. of these materials refer to the description of <Material of Porous Sheet> in the first embodiment, and a detailed description thereof is omitted.

<Super absorbent polymer>

As the superabsorbent polymer 42, various known materials used as absorbent body materials in absorbent articles such as disposable diapers and urine pads can be used. As the superabsorbent polymer 42, for example, starch-based acrylic acid (salt) graft copolymer, saponified product of starch-acrylonitrile copolymer, saponified product of starch-ethyl acrylate graft copolymer can be used; Cellulose-based products such as cross-linked products of cellulose sodium; synthetic polymer-based materials such as acrylic acid (salt) polymers and cross-linked products of polyvinyl alcohol-maleic anhydride reactants. These substances may be used alone or in combination of two or more. The shape of the superabsorbent polymer 42 is not particularly limited, and polymers in shapes such as granular, powdery, granular, sol, film, and fibrous shapes can be used, for example.

<fiber material>

As the fiber material, for example, cellulosic fibers such as pulp fibers, rayon fibers, and cotton fibers; synthetic fibers such as polyethylene, polypropylene, and polyethylene terephthalate, which are obtained by hydrophilic treatment. Material. These materials may be used alone or in combination of two or more.

<Ratio of depth to aperture>

In the porous sheet 100 of the third embodiment, it is preferable that the depth of the through-holes 21 is larger than the diameter of the holes. That is, the ratio of the depth to the diameter of the through hole 21 (aspect ratio) is preferably greater than 1. Regarding the preferred numerical range as the ratio of the depth to the diameter of the through-hole 21 , the description of <ratio of the depth to the diameter of the hole> in the first embodiment is referred to, and a detailed description thereof is omitted.

<thickness, height, aperture>

The thickness of the partition wall 30, the height of the partition wall 30, and the diameter of the through-hole 21 are not particularly limited, and the description of <thickness>, the description of <height>, and the description of <aperture> in the first embodiment are cited for their preferred numerical ranges. and omit its detailed description.

<compressive strength>

In the porous sheet 100 of the third embodiment, similarly to the first embodiment, in order to prevent deformation due to a force applied by the wearer, it is preferable that the strength against compression (compression strength) be high. Regarding the compressive strength of the porous sheet 100 and the preferred numerical ranges of the compressive strength per unit density, the description of <compressive strength> in the first embodiment is used, and a detailed description thereof is omitted.

<porosity>

In the porous sheet 100 of the third embodiment, similarly to the first embodiment, it is preferable that the porosity is high from the viewpoints of easily taking soft feces into the through-holes 21 and improving the compressive strength per unit density. Regarding the preferable numerical range of the porosity of the porous sheet 100 , the description of <porosity> in the first embodiment is referred to, and a detailed description thereof is omitted.

In the porous sheet 100, as in the first embodiment, from the viewpoint of strength and ease of manufacture, it is preferable to have overlapping cells 11a, 11b composed of through-holes 21 and partition walls 30 that periodically appear in plan view. structure. Specifically, the partition wall 30 surrounding the through hole 21 preferably forms a circular or polygonal repeating structure, and more preferably forms a honeycomb pattern structure similar to that shown in FIGS. 3 and 4 of the first embodiment (see FIGS. 15 and 16 ). Alternatively, it is preferable that the partition wall 30 surrounding the through-hole 21 has a corrugated pattern structure similar to that shown in FIGS. 5 and 6 of the first embodiment (see FIGS. 17 and 18 ). Their structures will be described in turn. 15 to 18 show a perspective view of the porous sheet 100 (sheet main body 10 ) and a cross-sectional view of the partition wall 30 , but only a part of the repeating structure of the porous sheet 100 and the partition wall 30 is shown. In the third embodiment, the case where the superabsorbent polymer 42 adheres to the surface of the partition wall 30 was exemplified.

<Structure of honeycomb pattern>

As shown in FIGS. 15 and 16 , in the porous sheet 100 , the partition wall 30 preferably has a honeycomb pattern structure in which a plurality of polygonal cells 11 a having polygonal through-holes 21 a are assembled. Components of the honeycomb pattern structure shown in FIGS. 15 and 16 and preferred shapes of the cells 11 a are referred to in the description of <Structure of the Honeycomb Pattern> in the first embodiment, and detailed description thereof is omitted. _In addition, as the preferred numerical range of the interval L11 between the opposing sides of the cell 11a, the depth _D11 of the through hole 21a, and the ratio of the depth _D11 of the cell 11a to the interval _L11 between the opposing sides As in the first embodiment, the above-mentioned description is used and its detailed description is omitted.

<Manufacturing method in the case of having a honeycomb pattern structure>

When the partition walls 30 constitute the structure of the above-mentioned honeycomb pattern, the first manufacturing method or the second manufacturing method described in the first embodiment can be applied as the manufacturing method of the porous sheet 100 . In the case of applying the first manufacturing method, when a plurality of base material parts 32 are bonded in a positional relationship in which the convex parts correspond to each other, for example, an adhesive material can be applied to the base material parts 32. , or by immersing the base material part 32 in an adhesive to attach the superabsorbent polymer 42 to the surface of the base material part 32 . In addition, in the case of applying the second production method, when obtaining a laminate obtained by laminating substrates, for example, by applying an adhesive material to the laminated substrate or immersing the laminate in In the adhesive, the superabsorbent polymer 42 is attached to the surface of the substrate.

<Moiré pattern structure>

As shown in FIGS. 17 and 18 , in the porous sheet 100 , it is preferable that the partition wall 30 has a corrugated pattern structure composed of repetitions of corrugated groove portions 35 and flat plate liner portions 36 . In the third embodiment, the superabsorbent polymer 42 is adhered to the surfaces of the groove portion 35 and the liner portion 36 . Regarding the other components in the corrugated pattern structure shown in FIGS. 17 and 18 and the preferred shape of the cells 11a, the description of <the corrugated pattern structure> in the first embodiment is referred to, and a detailed description thereof is omitted. In addition, as a preferable numerical range of the interval L ₂₁ of the liner portion 36, the pitch L ₂₂ of the corrugation of the groove portion 35, the depth D ₂₁ of the through hole 21b, and the distance between the depth D ₂₁ of the liner portion 36 with respect to the interval L ₂₁ It is the same as in the first embodiment, and the above-mentioned description is referred to, and its detailed description is omitted.

<Manufacturing method in the case of having a moire pattern structure>

When the partition walls 30 constitute the above-mentioned corrugated pattern structure, the third manufacturing method described in the first embodiment can be applied as the manufacturing method of the porous sheet 100 . In the case of applying the third manufacturing method, when a plurality of groove-shaped parts 35 and a plurality of liner parts 36 are alternately pasted, for example, an adhesive material can be applied to the groove-shaped parts 35 and the liner parts 36, or The groove-shaped portion 35 and the liner portion 36 are immersed in the adhesive, whereby the superabsorbent polymer 42 is attached to the surface of the substrate.

[laminated body]

In the third embodiment, the laminate 200 has a top sheet 51 and a support sheet 54 disposed on both main surfaces of the porous sheet 100, and is formed on the surface of the support sheet 54 opposite to the surface on which the porous sheet 100 is provided. A laminated structure provided with a back sheet 55 . That is, the laminated body 200 has the support sheet 54 instead of the absorber 40 in 1st Embodiment, It has the structure similar to 1st Embodiment except that, The above-mentioned description is used, and the detailed description is abbreviate|omitted.

<top sheet>

The topsheet 51 of the third embodiment has a dimension in the width direction larger than that of the porous sheet 100 and the support sheet 54, and covers the porous sheet 100 and the support sheet 54 from the side facing the skin. The skin of the wearer is in contact with the porous sheet 100 to allow excreted water to pass through and be absorbed. About other structures, the description of <top sheet> of 1st Embodiment is referred, and the detailed description is abbreviate|omitted.

<support piece>

The support sheet 54 is a sheet-shaped member arranged on the non-skin-facing side of the porous sheet 100 in the laminate 200 . The support sheet 54 absorbs moisture such as liquid components contained in urine or soft stools, and prevents rewetting. Therefore, the support sheet 54 is made of a fibrous material excellent in water absorption.

As the fiber material constituting the support sheet 54, for example, cellulose fibers such as pulp fibers, rayon fibers, and cotton fibers can be mentioned; synthetic fibers such as polyethylene, polypropylene, and polyethylene terephthalate are hydrophilic material obtained by chemical treatment. These materials may be used alone or in combination of two or more.

<back film>

The back sheet 55 is disposed on the side not facing the skin relative to the porous sheet 100 and the supporting sheet 54, so as to prevent excrement from leaking from the porous sheet 100 and the supporting sheet 54 to the side not facing the skin. Regarding other configurations, the description of the <back sheet> of the first embodiment is referred to, and a detailed description thereof is omitted.

In the third embodiment, each component of the side panel 61, the cover panel 62, and the gathers 70 can be constituted in the same manner as the corresponding components described in the first embodiment, and the above description is referred to and detailed description thereof is omitted. It should be noted that, among these, since the diaper 300 of the third embodiment has the support sheet 54 instead of the absorber 40, in the cover sheet 62, the first cover sheet 63 does not face the skin through the back sheet 55. The surface side covers the porous sheet 100 and the support sheet 54 .

[Modification of the porous sheet]

In the above description, the case in which the porous sheet 100 of the third embodiment is provided with the sheet main body 10 having the plate-shaped partition walls 30 constituting the honeycomb pattern structure and forming The surrounding through hole 21a. In addition, the structure of the honeycomb pattern is a case where a plurality of cells 11a composed of through-holes 21a and plate-shaped cell walls 31 surrounding the through-holes 21a are assembled (see FIGS. 15 and 16 ), or The case where the porous sheet 100 has the partition walls 30 (see FIGS. 17 and 18 ) constituting the corrugated pattern structure is described as an example. The configuration of the porous sheet 100 is not limited thereto, and may be changed as appropriate as long as it has the partition walls 30 that define the through-holes 21 . For example, the partition walls 30 of the porous sheet 100 may have a core pattern structure in which a plurality of groove-shaped portions having a cylindrical repeating structure are laminated. Alternatively, as shown in FIG. 19 and FIG. 20 , like the modified example described with reference to FIG. 7 and FIG. 8 of the first embodiment, the partition wall 30 of the porous sheet 100 may constitute a plurality of through-holes 21c and hole chambers 11c. In the resulting structure, the cell 11c surrounds the through hole 21c and is constituted by a cell wall 38 thicker than the plate-shaped cell wall 31 described above. It should be noted that, in FIGS. 19 and 20 , one of the chambers 11 c is shown surrounded by a two-dot chain line. In the configuration of this modified example, a superabsorbent polymer 42 is attached to the surface of the partition wall 30 . It should be noted that other matters such as the preferred shape and porosity of the cells 11 c are the same as those in the first embodiment, and the above-mentioned descriptions are referred to and detailed descriptions thereof are omitted.

In addition, when the partition wall 30 has the above-mentioned structure, the fourth manufacturing method or the fifth manufacturing method described in the first embodiment can be applied as the manufacturing method of the porous sheet 100 of the modified example. In the case of applying the fourth manufacturing method, the superabsorbent polymer can be made by, for example, applying an adhesive to the member provided with the through-hole 21c, or immersing the member provided with the through-hole 21c in an adhesive agent. 42 is attached to the surface of the part from which it is manufactured. In addition, in the case of applying the fifth manufacturing method, when the shaped aggregate is taken out from the template inner container, for example, an adhesive material may be applied to the shaped aggregate, or the shaped aggregate may be Immersion in the adhesive causes the superabsorbent polymer 42 to adhere to the surface of the assembly.

[2. Function and effect]

Since the porous sheet 100 and the disposable diaper 300 of this embodiment are configured as described above, the following operations and effects can be obtained.

(1) Conventionally, when using a disposable diaper, there was a problem that the solid content of soft feces leaked out of the disposable diaper because it was not easy to pass through the top sheet and was not easily absorbed by the absorbent body. Therefore, in order to prevent soft stools from leaking out, there is known an absorbent article in which a top sheet made of a nonwoven fabric has a thickness and a plurality of holes are formed, and the holes are used to retain soft stools. In addition, there is known an absorbent article that captures loose stools by providing continuous fibers with oriented fibers or a combination of fiber bundles on the upper surface of the top sheet, and using these continuous fibers or combinations. In addition, there is also known an absorbent article in which a space is formed between a top sheet and an absorber, and soft stool is accommodated in the space. Soft feces can be contained in these absorbent articles by the respective containing units provided therein. However, they are all absorbent articles that retain soft stools in a receiving unit that is soft and easily deformed. Therefore, in the state where the wearer is wearing the diaper, when the wearer performs an action such as sitting or turning over, the intake unit that accommodates the soft feces is subject to deformation, and the soft feces leak from the intake unit and may adhere. on the skin of the wearer, or leak out of the diaper. In addition, there is also known an absorbent article in which the absorber itself has through holes, but the purpose is to improve air permeability, and it cannot be said to be sufficient as a countermeasure against leakage of soft stools.

In the porous sheet 100 , the sheet body 10 has partition walls 30 that define the through-holes 21 . Therefore, the porous sheet 100 can take in the soft stool from the end surface 10 a and hold the solid content contained in the soft stool inside the through-hole 21 . Furthermore, in the first embodiment, the depth of the through hole 21 is larger than the diameter of the hole. Thereby, the solid content contained in soft stool can be held inside the through-hole 21 more reliably. Moreover, the liquid component contained in soft stool can be made to flow out from the end surface 10b. In this way, the porous sheet 100 can incorporate and hold the soft feces solids that are difficult to be absorbed by the absorbent body. In addition, for example, in the past, soft feces could not penetrate the top sheet and spread in the plane direction, but the porous sheet 100 can prevent the diffusion of such soft stools in the plane direction, and make the components contained in the soft feces face toward the surface of the porous sheet 100. through the thickness direction. In addition, in the porous sheet 100 , the through-holes 21 are supported by the partition walls 30 that define the through-holes 21 and surround the periphery thereof, thereby exhibiting relatively high strength against external force. Therefore, in the porous sheet 100, even when a load is applied from the outside, the deformation of the partition wall 30 and the through-hole 21 is suppressed, and it is difficult to collapse. As a result, the porous sheet 100 can more stably hold soft feces inside the through-holes 21 . Among them, high strength is exhibited against the force in the thickness direction of the partition wall 30 around the through hole 21 , which is along the axial direction connecting both ends of the through hole 21 on the side of the end surface 10 a and the side of the end surface 10 b . Therefore, the porous sheet 100 has excellent strength against a force applied from the end surface 10 a or the end surface 10 b side where the loose stools are taken in, and can stably hold loose stools.

(2) In addition, in the second embodiment, the partition wall 30 has the permeation hole 22 which communicates with the adjacent through-hole 21 and allows moisture to permeate. Accordingly, moisture such as urine or liquid components included in the porous sheet 100 can pass through the partition walls 30 through the permeable holes 22 . Therefore, the moisture in the porous sheet 100 diffuses in the porous sheet 100 by spreading into the adjacent through-holes 21 . Thus, when soft stools are incorporated into the porous sheet 100, the solid content contained in the soft stools is held in the through holes 21 near the portion of the porous sheet 100 where the soft stools are incorporated, and the solid content contained in the soft stools The liquid component diffuses in the porous sheet 100 from the vicinity of the site where the soft stool is contained toward its periphery. In addition, in the state where soft stools are contained in the porous sheet 100 , even when urine is further excreted, the urine diffuses into the porous sheet 100 through the portion where the soft stools were contained. In this way, when soft feces or urine are contained in a part of the porous sheet 100, by using the permeable holes 22 to diffuse moisture to the surroundings, it is possible to prevent the solid solids of soft feces from being incorporated into the through holes 21 near the part where the soft feces are contained. Components and liquid components, as well as urine, overflow from the porous sheet 100 to stay inside the porous sheet 100 . In addition, even when the partition walls 30 are deformed by applying an external force from the porous sheet 100, the moisture in the through-holes 21 can diffuse into the adjacent through-holes 21 through the through-holes 22, thereby enabling absorption and deformation. The accompanying volume reduction of the through holes 21 can prevent soft stools and urine from overflowing and staying in the porous sheet 100 .

(3) In addition, in the third embodiment, the superabsorbent polymer 42 is attached to the partition wall 30 . The porous sheet 100 can absorb and retain moisture such as liquid components contained in urine or soft stools using the superabsorbent polymer 42 . Therefore, with the porous sheet 100 , the solid components contained in the soft stool are held in the through holes 21 of the porous sheet 100 , and the liquid components contained in the soft stool are held by the superabsorbent polymer 42 . This prevents urine or soft feces excreted by the wearer from leaking out of the porous sheet 100 and remaining in the porous sheet 100 . In addition, using the porous sheet 100, since the soft feces can be kept in the porous sheet 100 and avoid the wearer's skin, the surface of the wearer's skin can be kept clean, and skin problems such as rashes on the buttocks and the like can be suppressed or eliminated. Discomfort caused by contact with feces. In addition, as described above, since the porous sheet 100 exhibits high strength against the external force, the superabsorbent polymer 42 in the porous sheet 100 can be suppressed from being affected by the external force. Therefore, even when an external force is applied to the porous sheet 100, it is possible to suppress the liquid component absorbed by the superabsorbent polymer 42 from seeping back to the wearer's skin surface (recovery), and prevent it from adhering to the skin. surface.

(4) In addition, in the porous sheet 100, the partition walls 30 constitute a honeycomb pattern structure. Thus, by increasing the area occupied by the through-holes 21 in the partition wall 30 in the plan view of the porous sheet 100, the weight of the porous sheet 100 can be reduced and the amount of feces that can be accommodated inside can be increased. In addition, the porous sheet 100 is excellent in strength in the thickness direction and the plane direction. In addition, in the porous sheet 100 in which the partition walls 30 constitute a honeycomb pattern structure, the anisotropy of the strength in the plane direction is relatively small, and exhibits the same level of strength against loads applied from different directions in the plane direction. In addition, in the porous sheet 100 in which the partition walls 30 constitute a honeycomb pattern structure, the anisotropy against bending is relatively small, and bending deformation can be equally generated in different directions in the plane direction. Therefore, in the porous sheet 100 in which the partition walls 30 constitute a honeycomb pattern structure, the degree of freedom in design and arrangement is excellent.

(5) In addition, in the porous sheet 100, the partition walls 30 constitute a corrugated pattern structure. Thus, by increasing the area occupied by the through-holes 21 in the partition wall 30 in the plan view of the porous sheet 100, the weight of the porous sheet 100 can be reduced and the amount of feces that can be accommodated inside can be increased. In addition, the porous sheet 100 is also excellent in strength in the thickness direction and the plane direction. In addition, the porous sheet 100 in which the partition walls 30 have a corrugated pattern structure has anisotropy in plane direction strength, and has excellent strength against a load applied in a direction horizontal to the wall surface of the liner portion 36 . In addition, the porous sheet 100 in which the partition wall 30 constitutes the corrugated pattern structure has anisotropy against bending, showing that it is not easy to bend along the direction parallel to the wall of the liner part 36, and is not easy to bend in the direction perpendicular to it, that is, along the direction perpendicular to the wall. The direction of the wall surface of the lining part 36 is easy to bend. Therefore, in the porous sheet 100 in which the partition walls 30 constitute the corrugated pattern structure, the anisotropy with respect to strength and bending can be utilized, and the arrangement or use of the porous sheet 100 can be performed according to the required performance.

(6) In the first and second embodiments, the disposable diaper 300 includes the porous sheet 100 and the absorber 40 including the superabsorbent polymer 42 provided on the other end surface 10 b side of the porous sheet 100 . Thereby, the liquid component contained in the soft stool contained in the porous sheet 100 flows out from the end face 10 b side of the porous sheet 100 and is absorbed by the absorbent body 40 . And, the liquid component spreads and is held inside the absorber 40 . Therefore, the solid components contained in the soft stools are held in the through-holes 21 of the porous sheet 100 , and the liquid components contained in the soft stools are held by the absorbent body 40 . Accordingly, it is possible to prevent soft feces excreted by the wearer from leaking out of the diaper 300 and staying in the diaper 300 .

In addition, in the second embodiment, moisture diffuses in the porous sheet 100 by providing the partition walls 30 with the permeable holes 22 . In addition, the absorber 40 can absorb diffused moisture. Therefore, a part of the moisture contained in the porous sheet 100 can be quickly absorbed and retained over a wider area through the porous sheet 100 and the absorber 40 .

In addition, in the first embodiment and the second embodiment, the porous sheet 100 and the absorber 40 can keep soft feces away from the wearer's skin by using the disposable diaper 300, so that the wearer's skin surface can be kept soft. Keep clean, suppress or eliminate skin problems such as rashes on the buttocks and discomfort caused by contact with feces. In addition, by disposing the absorbent body 40 on the side not facing the skin with respect to the porous sheet 100 , the porous sheet 100 is positioned between the wearer's skin surface and the absorbent body 40 . Therefore, even in the event that the liquid component absorbed by the absorbent body 40 seeps back to the wearer's skin surface side (dampness), by separating the skin surface from the absorbent body 40 with the porous sheet 100, it is possible to prevent Adhesion of the liquid component to the skin surface.

In addition, in the third embodiment, the disposable diaper 300 includes the porous sheet 100 and the moisture-absorbing support sheet 54 provided on the other end surface 10 b side of the porous sheet 100 . Accordingly, when moisture such as urine or liquid components contained in the porous sheet 100 flows out from the end surface 10 b side of the porous sheet 100 , it is quickly absorbed by the support sheet 54 to prevent rewetting. In addition, as described above, the porous sheet 100 exhibits high strength against external force, in which the strength in the thickness direction connecting the end surface 10a and the end surface 10b is excellent. Therefore, for example, when the porous sheet 100 is disposed with the end surface 10a facing the wearer's anus or its periphery, when the wearer defecates, soft stool can be taken into the through hole 21 from the end surface 10a. In addition, even when the wearer's load is applied from the end surface 10a to the thickness direction by the wearer's sitting or turning over, the deformation of the through hole 21 and the partition wall 30 can be suppressed, and the softness can be maintained. The state inside the through hole 21 is maintained.

In addition, as described above, in each embodiment, the porous sheet 100 exhibits high strength against external force, in which the strength in the thickness direction connecting the end surface 10 a and the end surface 10 b is excellent. Therefore, for example, when the porous sheet 100 is disposed with the end surface 10a facing the wearer's anus or its periphery, when the wearer defecates, soft stool can be taken into the through hole 21 from the end surface 10a. In addition, even when the wearer's load is applied from the end surface 10a to the thickness direction by the wearer's sitting or turning over, the deformation of the through hole 21 and the partition wall 30 can be suppressed, and the softness can be maintained. The state inside the through hole 21 is maintained. In addition, in the second embodiment, even when the partition walls 30 are deformed due to the external force applied by the porous sheet 100 , the moisture in the through holes 21 spreads to the adjacent through holes 21 through the permeable holes 22 . , and the extended moisture can be quickly absorbed and held by the absorbent body 40 . Therefore, the solid and liquid components of soft stool can be more reliably retained in the porous sheet 100 and the absorbent body 40 .

(7) The disposable diaper 300 further includes a top sheet 51 provided on the one end surface 10 a side of the porous sheet 100 , which has water permeability and has a passing portion 52 through which feces pass. Thus, by arranging the top sheet 51 on the outermost surface of the laminate 200 including the porous sheet 100 , the wearer's skin surface is brought into contact with the top sheet 51 . Therefore, it is possible to reduce or eliminate discomfort caused by direct contact between the wearer's skin and the porous sheet 100, and to improve skin touch. In addition, the top sheet 51 is capable of permeating the liquid component contained in the soft stool and allowing the solid content contained in the soft stool to pass through the passing portion 52 . And, in the first embodiment and the second embodiment, the liquid component that has permeated the top sheet 51 is absorbed by the absorbent body 40 through the porous sheet 100; The components are absorbed by the superabsorbent polymer 42 contained in the partition wall 30 .

In addition, the solid matter permeated through the top sheet 51 is taken in and held by the porous sheet 100 . In this way, by providing the top sheet 51 in the disposable diaper 300, the skin feel can be improved, and at the same time, liquid components such as urine or excrement containing solid components and liquid components such as loose stools can pass without causing side leakage. Keep them below.

[3. Other]

[about an absorbent article]

In the above description, the case where the underpants-type disposable diaper 300 is used as an absorbent article has been described as an example. The absorbent article is not limited thereto, and may be used as appropriate as another absorbent article including the porous sheet 100 or the laminate 200 . As such an absorbent article, the cleaning pad for beds is mentioned, for example. The cleaning pad is a cushion-like bedding that is spread on the mattress placed on the bed. Users such as a person who is sleeping or a caregiver needs to lie down on the cleaning pad laid on the mattress to sleep. This absorbent article (cleaning pad) is equipped with the laminated body 200, and the top sheet 51 is provided facing the upper side of the gravitational direction, and the back sheet 55 is provided toward the mattress side which is the lower side of the gravitational direction. At this time, the cleaning pad may be of a size that covers the entire bed or substantially the entire bed, or may be of a size that can cover the position corresponding to the anus or its surrounding area, or the waist or its surrounding area when the user lies on the bed. . In addition, the cleaning pad may be provided with anti-slip processing on the lower surface of the back sheet 55 . In addition, from the viewpoint of facilitating passage, intake, and absorption of excrement, it is preferable to use the cleaning pad without laying a bed sheet or the like on it and directly touching it to the user.

With such a cleaning pad, when the user defecates on the bed provided with the cleaning pad, the soft feces pass through the top sheet 51 . And, the soft stool is taken into the through-hole 21 of the porous sheet 100 , and the solid content contained in the soft stool is held in the through-hole 21 . In addition, in the first embodiment and the second embodiment, the liquid component contained in the soft stool flows out from the through hole 21 and is absorbed and held by the absorbent body 40, and in the third embodiment, the liquid component contained in the soft stool The liquid component is absorbed and held by the superabsorbent polymer 42 contained in the partition wall 30 . Furthermore, urine also passes through the top sheet 51 and the porous sheet 100, and is absorbed and held by the absorbent body 40 in the first embodiment and the second embodiment, and is absorbed and held by the superabsorbent polymer 42 in the third embodiment. In this way, with the cleaning pad, even when the user is not wearing a diaper, excrement is retained and prevented from spreading. Among them, it is effective for soft drinks containing solid components and liquid components. In addition, when a user wearing a diaper urinates on a bed provided with a cleaning pad, excrement such as soft stool or urine leaking from the diaper can be similarly held and prevented from spreading.

[About porous sheets and laminates]

In the above description, the case where the disposable diaper 300 is provided with the porous sheet 100 and the laminate 200 was taken as an example and described. The porous sheet 100 and the laminate 200 are not limited thereto, and can be used as appropriate other than disposable diapers. For example, the porous sheet 100 and laminate 200 can be used as a cleaning pad as described above. In addition, the porous sheet 100 and the laminated body 200 can also be used individually as a cleaning pad. In this case, for example, the porous sheet 100 is provided on a mattress placed on a bed. At this time, the porous sheet 100 may be of a size that covers the entire bed or substantially the entire bed, or may be of a size that can cover the position corresponding to the anus or its surrounding area, or the waist or its surrounding area when the user lies on the bed. size. In addition, from the viewpoint of facilitating the passage, intake, and absorption of excrement, the porous sheet 100 is preferably used without laying a bed sheet or the like on it and directly touching it to the user. With such a porous sheet 100, when the user excretes on the bed provided with the porous sheet 100, soft feces are taken into the through holes 21 of the porous sheet 100, so that the solid components contained in the soft stool are held in the through holes. In 21, it is possible to prevent the solid component from spreading in the lateral direction. In the third embodiment, the superabsorbent polymer 42 contained in the partition wall 30 can also absorb and retain moisture such as liquid components contained in urine or loose stools. In addition, when the user wearing the diaper excretes on the bed provided with the porous sheet 100 , excrement such as loose stools leaking from the diaper can be similarly held and prevented from spreading.

In addition, the porous sheet 100 and the laminate 200 can be used as an absorbent pad. Absorbent pads are placed in underwear or cloth panty-type outer bodies called holder pants for holding absorbent pads to absorb excrement. In the first embodiment and the second embodiment, with this porous sheet 100, as in the case of the disposable diaper 300, soft feces are contained in the through-holes 21, and the solid content contained in the soft feces is retained. In the through hole 21, the solid component can thus be prevented from spreading in the lateral direction. In addition, in the first embodiment and the second embodiment, with the laminated body 200 of this example, as in the case of the disposable diaper 300, soft feces are contained in the through-holes 21, and the soft feces contain The solid components contained in the stools are held in the through holes 21 to prevent them from expanding, and the liquid components contained in the soft stools can be absorbed and held by the absorbent body 40 . In addition, in the third embodiment, using the porous sheet 100 and the laminated body 200, as in the case of the disposable diaper 300, soft feces are contained in the through holes 21, and the solid content contained in the soft feces By being held in the through hole 21, the solid component can be prevented from expanding in the lateral direction. In addition, in the third embodiment, the superabsorbent polymer 42 contained in the partition wall 30 can absorb and hold moisture such as liquid components contained in urine or loose stools.

[About the diameter and arrangement of through-holes]

In the above description, the case where the through-holes 21 having the same diameter are arranged as an example has been described. The diameter of the through-holes 21 is not limited thereto, and the diameters of the through-holes 21 included in one porous sheet 100 may be different from each other, or may be changed according to the position in the porous sheet 100 . In addition, the arrangement of the through-holes 21 may not be uniform, and the distribution of the through-holes 21 may be changed according to the positions in the porous sheet 100 . For example, the number of through-holes 21 may be increased by increasing the density of cells 11 contained in a part of the region, or the number of through-holes 21 may be reduced by reducing the density of cells 11 contained in a part of the region.

[About configuration of porous sheet]

In the above description, the case where one porous sheet 100 is provided in the crotch portion 300B of the disposable diaper 300 has been described as an example. The arrangement of the porous sheet 100 is not limited thereto. For example, as described below, the porous sheet 100 may be divided into a plurality in the plane direction and arranged.

In FIG. 21 , as a modified example of the porous sheet 100 , the case where the porous sheet 100 is divided into a plurality in the plane direction is taken as an example and shown. In FIG. 21 , the top sheet 51 and the porous sheet 100 are extracted and shown from the developed view of the disposable diaper (absorbent article) shown in FIG. 1 . The porous sheet 100 shown in FIG. 21 is divided into a plurality of porous sheets 110 along the plane direction. The plurality of porous sheets 110 are continuously arranged in the width direction and the longitudinal direction, and the plurality of continuously arranged porous sheets 110 form one porous sheet 100 as a whole. In each porous sheet 110, the partition wall 30 constitutes the structure of the honeycomb pattern shown in the above-mentioned FIG. 3, FIG. 4, FIG. 10, FIG. 11, FIG. 15, and FIG. The corrugated pattern structure shown in Fig. 17 and Fig. 18. In this case, the porous sheet 100 is likely to be bent at the portion where the porous sheets 110 are continuously provided. Therefore, when the partition wall 30 has a honeycomb pattern structure or a corrugated pattern structure, the ease of bending the entire porous sheet 100 in the thickness direction is improved, and the diaper 300 can be easily folded along the wearer's body. . It is possible to improve the formability during processing and the fit during wearing. This improves leak resistance.

In addition, in the configuration in which a plurality of porous sheets 110 are continuously provided as shown in FIG. 21 , the porous sheet 110 having a honeycomb pattern structure and the porous sheet 110 having a corrugated pattern structure can be combined to form one porous sheet 100 . In this case, by appropriately setting the arrangement positions of the porous sheet 110 having the honeycomb pattern structure and the porous sheet 110 having the corrugated pattern structure, and the orientation of the extending direction of the porous sheet 110 having the corrugated pattern structure, further improvement can be achieved. A porous sheet 100 that is excellent in strength in the thickness direction and in the plane direction and is easily deformed by bending is obtained. Thereby, the fitting feeling can be further improved, and it is possible to easily follow the wearer's skin surface in the longitudinal direction of the disposable diaper 300 and take in loose stools.

In addition, in each of the above-mentioned embodiments, the porous sheet 100 has the partition walls 30 constituting the honeycomb pattern structure or the partition walls 30 constituting the corrugated pattern structure on the entire surface, but it is not limited to this structure, and the porous sheet 100 may be formed on a porous sheet. A part of 100 has a structure in which partition walls 30 constituting a honeycomb pattern structure or partition walls 30 constituting a corrugated pattern structure are disposed. Figure 22 shows the position 120 of the wearer's urethra (shown by a dotted line in Figure 22 ) and the position 125 of the anus of the wearer only in the wearing state of the diaper 300 in the porous sheet 100 (shown by a broken line in Figure 22 ). 22) is an example where the partition walls constituting the honeycomb pattern structure or the partition walls constituting the corrugated pattern structure are arranged. As shown in FIG. 22 , it is appropriate to arrange the main sites (120 of the urethra and 125 of the anus) that are responsible for absorbing and retaining urine and feces in the partition walls or the corrugated pattern constituting the honeycomb pattern structure. In this case, while maintaining the advantages of the above-mentioned honeycomb pattern structure or corrugated pattern structure, the ease of bending the entire porous sheet 100 in the thickness direction can be improved, and the formability and fit during wearing can be improved.

In addition, in the above-mentioned first embodiment and second embodiment, the structure of the laminated body 200 in which the absorber 40 is provided on the end surface 10b side as one main surface of the porous sheet 100 was given as an example. In the third embodiment, the structure of the laminate 200 in which the support sheet 54 is provided on the end surface 10b side of the porous sheet 100 as the other main surface was taken as an example, but in each embodiment, it is also possible to apply The structure in which the laminate 200 of both the absorber 40 and the support sheet 54 is provided on the end surface 10b side of the porous sheet 100 is provided.

In addition, in the above-mentioned first and second embodiments, the structure of the laminate 200 in which the support sheet 54 is provided on the end surface 10b side of the porous sheet 100 can also be applied, and in the third embodiment, it can also be applied to The structure of the laminated body 200 is provided on the end surface 10b side of the porous sheet 100 .

In addition, various configurations disclosed in the above-mentioned first embodiment, second embodiment, and third embodiment may be combined. For example, the porous sheet 100 may have the following structure: it has a partition wall 30 that defines a through hole 21 whose depth is greater than the diameter of the hole, and has a permeable hole 22 on the side of the partition wall 30 to allow moisture to pass through, and a 30 is attached with superabsorbent polymer 42 .

[About the main body of the piece]

In particular, here, other sheets (for example, a top sheet) also include the concept of a "sheet main body" similarly to the porous sheet 100 .

[Example]

Examples are given below to describe the present invention in detail. It should be noted that, as long as it does not deviate from the gist of the present invention, the materials, dosages, ratios, processing contents, processing procedures, etc. shown in the following examples can be changed as appropriate. Therefore, the present invention is not limited to the following examples.

[Evaluation method]

The physical properties of the porous sheets obtained in the following Examples and Comparative Examples were evaluated according to the following evaluation methods and evaluation criteria.

<compressive strength>

In the measurement of the maximum load, the porous sheet obtained in each embodiment and comparative example was cut out into a test piece with a surface direction of 5 cm square and a thickness direction of 5 mm, and was tested in a plane-parallel manner in a universal testing machine (Model 5982 manufactured by INSTRON Corporation). A metal plate was set as a presser, the compressive load was measured at a speed of 5 mm/min, and the value reaching the maximum load was taken as the compressive strength.

<Measurement of compressive strength per unit density>

The porous sheet obtained in each of Examples and Comparative Examples was cut out into a test piece having a surface direction of 5 cm square and a thickness direction of 5 mm to obtain a sample for density measurement.

Thereafter, the weight was measured with a precision balance (ML304T from Mettler Toledo), and the density was calculated.

Next, the compressive strength per unit density was calculated by dividing the compressive strength of each test piece by the density.

<porosity>

The porous sheets obtained in Examples and Comparative Examples were photographed with a camera under planar observation to obtain planar images. Image analysis is performed on the planar image to obtain the total area of the through-holes included in the image and the area of the entire image. Furthermore, the percentage obtained by dividing the total area of the through-holes by the overall area was calculated. Further, during this process, the camera shooting position was changed for 5 shots, and the average value of the 5 calculated values was obtained as the porosity.

<Intake and retention properties of soft stools>

Simulated loose stools (hereinafter also referred to as "artificial loose stools") imitating loose stools were produced using the following ingredients.

Composition of artificial soft stool (weight)

Bentonite 5.0%

Mayonnaise (commercially available) 5.0%

The balance is water (adjusted to a viscosity of 200cps)

The porous sheet obtained in each of the Examples and Comparative Examples was arranged on the absorbent body provided on the back sheet, and it was used as a sample for evaluating the flow distance and the amount of rewet.

(soft stool flow distance)

In the method of measuring the flow distance, the sample for evaluation was placed on a slope with an inclination angle of 30°. 10 ml of artificial soft stool was dripped onto the evaluation sample at a rate of 10 ml/sec using a pipette. The distance between the dripping position of the artificial soft stool at this time and the front position where the artificial soft stool reaches along the slope after 30 seconds of dropping is taken as the soft stool flow distance L.

Based on the measurement results, the flow distance of soft stools was judged according to the following criteria.

◎(Excellent): The value of the flow distance is less than 5cm

○ (good): The value of the flow distance is more than 5 cm and 10 cm or less

△ (Pass): The value of the flow distance is greater than 10cm and less than 20cm

× (Unqualified): The value of the flow distance is greater than 20cm

(rewet test)

The sample for evaluation was pasted and fixed on a horizontal flat plate with the porous sheet facing upward, and 15 cc of artificial soft stool was dripped from a height of 1 cm above (dropping speed 2 cc/sec) to the central part of the absorber of the sample using a pipette. When 3 minutes had elapsed after the dropwise addition, 10 sheets of filter paper were placed at the dropping position, and a 1 kg weighing weight (area of the filter paper contact surface: 100 cm ² ) was placed thereon for 1 minute. The weight of the filter paper before and after the test was measured, and the weight obtained by subtracting the weight of the filter paper before the test from the filter paper weight after the test was used as the rewetting amount. Based on the measurement results, the amount of rewetting of soft stools was judged on the basis of the following criteria.

◎(Excellent): The rewetting amount is less than 1g

○ (good): The value of rewetting amount is more than 1 g and 5 g or less

△ (Pass): The value of the rewetting amount is greater than 5g and less than 10g

× (Unqualified): The value of rewetting amount is greater than 10g

[Example 1]

The honeycomb was formed from a paper sheet having a thickness of 90 μm, a paper weight (basis weight) of 64 g/m ² , and an apparent density of 0.7 g/cm ³ . Node lines of solvent and adhesive were coated on the surface of the paper sheet at a width of 3 mm and a pitch of 12 mm, and the solvent was removed.

The sheet having the node lines of the adhesive was cut to a length of 500 mm. A plurality of sheets were sequentially stacked so that each sheet was shifted from other sheets by half the pitch of the node lines of the adhesive applied thereto. This offset is done alternately left and right in such a way that the resulting stack is uniformly vertical. The width of the node lines and the offset amount (offset amount) of the pitch are an amount to make the hole size (aperture diameter) 5 mm at the time of development. Next, the laminated sheets of this number are thermally compressed between the plates at the softening point of the adhesive, and the node lines of the adhesive are made to flow. Once the heat is removed, the adhesive cures and the pieces are bonded to each other with nodal wires. Next, in order to form a cell having an equilateral cross-section, the bonded paper sheets are unfolded in a direction opposite to the lamination direction. In each sheet, the sheet is folded along the edges of the joined node lines, and the unjoined portion is unfolded in the direction of tension, and unfolded mutually in such a manner that the photograph is separated from each other.

Finally, the porous sheet of Example 1 was obtained by coating or impregnating beeswax in order to impart water resistance to the whole.

The porous sheet of Example 1 has a regular hexagonal honeycomb pattern structure.

The obtained porous sheet was evaluated. The evaluation results are listed in Table 1.

[Example 2]

A porous sheet was obtained in the same manner as in Example 1 except that the width of the node lines in Example 1 was changed to 2 mm and the pitch was changed to 7 mm.

[Example 3]

A porous sheet was obtained in the same manner as in Example 1 except that the width of the node lines in Example 1 was changed to 1 mm and the pitch was changed to 3.5 mm.

[Example 4]

A porous sheet was obtained in the same manner as in Example 1 except that the width of the node lines in Example 1 was changed to 0.5 mm and the pitch was changed to 2 mm.

[Example 5]

A porous sheet was obtained in the same manner as in Example 1 except that the width of the node lines in Example 1 was changed to 1 mm and the pitch was changed to 3.5 mm.

[Example 6]

A porous sheet was obtained in the same manner as in Example 1 except that the width of the node lines in Example 1 was changed to 3.5 mm and the pitch was changed to 14 mm.

The obtained porous sheet was evaluated. The evaluation results are listed in Table 1.

[Example 7]

Coating on the top of corrugated paper obtained by corrugating a paper sheet having a thickness of 90 μm, a paper weight of 64 g/m ² , and an apparent density of 0.7 g/cm ³ at a wavelength (wave pitch) of 12 mm and a wave height (aperture) of 6 mm Hot-melt adhesive for bonding flat sheets and corrugated sheets alternately.

Finally, coating or impregnation with beeswax was carried out in order to impart water resistance to the whole, thereby obtaining the porous sheet of Example 7 (hereinafter sometimes referred to as "corrugated sheet").

The porous sheet of Example 7 has a corrugated pattern structure.

The obtained porous sheet was evaluated. The evaluation results are listed in Table 1.

[Example 8]

A porous sheet of Example 8 was obtained in the same manner as in Example 7, except that the corrugated sheet in Example 7 was corrugated at a wavelength of 7 mm and a wave height of 3.5 mm.

[Example 9]

A porous sheet of Example 9 was obtained in the same manner as in Example 7 except that the corrugated sheet in Example 7 was corrugated at a wavelength of 3.6 mm and a wave height of 1.8 mm.

[Example 10]

A porous sheet of Example 10 was obtained in the same manner as in Example 7, except that the corrugated sheet in Example 7 was corrugated at a wavelength of 2 mm and a wave height of 0.9 mm.

[Example 11]

A porous sheet of Example 11 was obtained in the same manner as in Example 1 except that the width of the node lines in Example 1 was changed to 7 mm and the pitch was changed to 28 mm.

The obtained porous sheet was evaluated. The evaluation results are listed in Table 1.

[Example 12]

A porous sheet of Example 12 was obtained in the same manner as in Example 7 except that the corrugated sheet in Example 7 was corrugated at a wavelength of 30 mm and a wave height of 15 mm.

The obtained porous sheet was evaluated. The evaluation results are listed in Table 1.

[Reference example 1]

After laminating 16 sheets of polypropylene non-woven fabrics with a weight per unit area (weight per unit) of 70 gsm that were hydrophilized, a punching machine was used to form holes with a diameter of 3 mm in a triangular grid at intervals of 4 mm. Porous sheet of Example 1 (reference example).

The obtained porous sheet was evaluated. The evaluation results are listed in Table 1.

[Table 1]

[Results and discussion]

As shown in Table 1, compared with the reference example 1 in which the partition wall does not have any structure in the honeycomb pattern structure and the corrugated pattern structure and is not constituted by a plate-shaped member extending in the thickness direction of the sheet main body, it has a structure In the porous sheets of Examples 1 to 6 and 11 having partition walls of a honeycomb pattern structure and the porous sheets of Examples 7 to 10 and 12 having a corrugated pattern structure, the compressive strength was improved, and deformation by load was less likely to occur. Thus, soft stools are maintained even under load. In addition, from a comparison with Examples 11 and 12, it can be seen that in the porous sheets of Examples 1 to 10, since the depth is larger than the pore diameter, soft feces are stably held inside the through holes.

Explanation of symbols

100 Porous sheet for soft stool (porous sheet)

200 Absorbent laminate (laminate)

300 Diapers (absorbent articles)

10 pieces of body

10a, 10b end faces

11 hole chamber (セル)

21 through hole

22 through hole

30 next door

31,34,38 cell walls

32 Substrate

33,37 bonding part

35 Slotted part (full part)

36 lining part (ライナー part)

40 absorber

41 Absorbent core

42 superabsorbent polymer

43 Fibrous materials

44 Wrapping sheet (rappshi-to)

51 top sheet

52 through ministry

54 support sheet

55 back film

61 side panels

62 shroud

70 pleats

80 wire rubber (stretchable parts)

110 porous sheet

120 Location of the urethra

125 Position of the anus

Claims (13)

1. A porous sheet for soft stools, wherein, The porous sheet includes: a sheet main body having a plurality of through holes penetrating in a thickness direction; The sheet main body has a partition wall that defines the through-hole. 2. The porous sheet for containing soft stools according to claim 1, wherein the through-holes have a depth greater than a diameter of the through-holes. 3. The porous sheet for storing soft stools according to claim 1 or 2, wherein the partition wall has a permeation hole that communicates with the adjacent through-hole and allows moisture to permeate. 4. The porous sheet for containing loose stools according to any one of claims 1 to 3, wherein a superabsorbent polymer is adhered to the partition walls. 5. The porous sheet for containing soft feces according to any one of claims 1 to 4, wherein the partition wall has a structure of a honeycomb pattern viewed from above, and the structure of the honeycomb pattern viewed from above is a plurality of polygonal cells when viewed from above. assembled. 6. The porous sheet for containing soft stools according to claim 5, wherein, The above-mentioned pore chamber is a regular hexagon, The distance between the opposite sides of the cells is 0.1 mm or more and 10 mm or less. 7. The porous sheet for containing soft feces according to any one of claims 1 to 4, wherein the partition wall has a corrugated pattern when viewed from above, and the corrugated pattern when viewed from above is a groove-shaped portion that is corrugated when viewed from above. It is formed repeatedly with the planar liner part. 8. The porous sheet for containing soft stools according to claim 7, wherein, The space between the lining parts is not less than 0.5 mm and not more than 10 mm, The pitch of the waveforms of the groove-shaped portion is not less than 0.5 mm and not more than 20 mm. The porous sheet for containing soft stools according to any one of claims 1 to 8, wherein the compressive strength per unit density is 0.5 kPa/(kg/m ³ ) or more. 10. An absorbent article comprising: The porous sheet for containing soft stool according to any one of claims 1 to 9, and An absorber provided on one side of the porous sheet for receiving soft stools and comprising a superabsorbent polymer. 11 . The absorbent article according to claim 10 , further comprising: a support sheet provided on one side of the porous sheet for storing loose stools and absorbing water. 11 . 12. An absorbent article comprising: The porous sheet for containing soft stool according to any one of claims 1 to 9, and A supporting sheet provided on one side of the porous sheet for receiving soft stools and absorbing water. 13. The absorbent article according to any one of claims 10 to 12, further comprising a top sheet provided on the other side of the porous sheet for receiving soft stools, the top sheet having water permeability and having Passing part through which feces pass.