JP2017099562A - Absorbent articles - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article which keeps bulkiness by unevenness of a surface sheet in the vicinity of a leakage prevention groove (a compressed groove) and achieves both excellent performance of preventing twists and lateral leakage of a liquid by the leakage prevention groove and excellent wearing feeling such as soft texture performance and dry feeling by the surface sheet.SOLUTION: A surface sheet 1 includes an uneven surface that does not involve an embossment part and a hollow part on a skin side surface and an absorber side surface, and at least a pair of right and left leakage prevention grooves 6 partially dented from the surface sheet to an absorber 3 are arranged on the surface sheet. The leakage prevention groove is configured to have a compressed part where the surface sheet and the absorber are dented in an integrally compressed state. In an absorbent article, the pair of the right and left leakage prevention grooves have a corrugated shape that respectively extends in a longitudinal direction in a plane view of the surface sheet and are configured to be bilaterally symmetric with respect to a central line in a width direction that extends in the longitudinal direction as an axis.SELECTED DRAWING: Figure 1

Description

  The present invention relates to absorbent articles such as sanitary napkins, incontinence pads, and diapers.

  In absorbent articles such as sanitary napkins, the material and structure of each member have been improved to improve its function and wearing feeling. The surface sheet and the absorbent body as members have also been developed with the aim of such improvement.

For example, Patent Document 1 describes a squeezing groove that integrally squeezes the topsheet and the absorbent body in order to prevent deformation of the napkin, twisting, and the like, and prevention of liquid side leakage. .
Patent Document 2 describes one in which embosses are arranged along the longitudinal direction on both sides of the absorbent body in order to suppress twisting and lateral leakage of the absorbent body in the napkin. The emboss is a pattern in which a plurality of straight portions and arc-shaped portions are alternately arranged.

International Publication No. 2004/078085 JP 2014-147446 A

  On the other hand, from the viewpoint of improving the feeling of wearing, it has been demanded to further improve the softness of the surface sheet that touches the skin and the dry feeling. On the other hand, attempts have been made to further improve the touch, breathability and liquid permeability by making the surface sheet uneven and bulky.

However, the bulky uneven portion of the top sheet as described above is apt to be crushed in a portion adjacent to the above-described compressed groove or the like as a leak-proof groove because of its softness. When the surface sheet has a hollow portion, it becomes particularly easily crushed. In this case, when the surface sheet is incorporated into the absorbent article, the original function of the bulky surface sheet may be impaired and may not be sufficiently exhibited.
As described above, the compressed groove or the like as the leakage preventing groove is very useful from the viewpoint of preventing twisting or side leakage of the liquid, but it is difficult to achieve compatibility with a bulky surface sheet having irregularities. The above-mentioned patent documents 1 and 2 do not describe this problem.

  Therefore, the present invention maintains the bulkiness due to the unevenness of the surface sheet in the vicinity of the leakage prevention groove (squeezing groove), the excellent prevention performance against twisting and side leakage due to the leakage prevention groove, and the soft touch property by the surface sheet, The present invention relates to an absorbent article that achieves both an excellent wearing feeling such as a dry feeling.

  The present invention has a skin contact surface side topsheet, a non-skin contact surface side backsheet, and an absorbent body positioned between the topsheet and the backsheet, An absorbent article having a longitudinal direction extending from the crotch portion to the back side portion and a width direction orthogonal to the longitudinal direction, wherein the top sheet is accompanied by an embossed portion on the skin side surface and the absorber side surface. A non-concave surface and a hollow portion, and at least a pair of leak-proof grooves that are partially recessed from the top sheet to the absorber are arranged on the top sheet. A top sheet and the absorber have a structure having a compacted portion that is recessed in an integrated compaction state, and the pair of left and right leakage prevention grooves are respectively waves extending in the longitudinal direction in a plan view of the topsheet. Having a shape and having a center line in the width direction extending in the longitudinal direction as an axis Shape to provide an absorbent article is symmetrical Te.

  The absorbent article of the present invention maintains the bulkiness due to the unevenness of the surface sheet in the vicinity of the leakage prevention groove, excellent prevention performance against twisting and side leakage due to the leakage prevention groove, and soft touch and dry feeling due to the surface sheet It is possible to achieve both excellent wear feeling such as.

It is a partially cutaway perspective view schematically showing from the skin contact surface side in a state where a sanitary napkin as a preferred embodiment of the absorbent article in the present invention is extended. It is a partially notched perspective view which shows typically the preferable aspect of the surface sheet in the sanitary napkin of this embodiment. It is a partially notched perspective view which shows typically the other preferable aspect of the surface sheet in the sanitary napkin of this embodiment. (A) is a top view which shows typically the preferable aspect of the wave shape of the pressing groove as a leak-proof groove in this embodiment, (B) is an outer curved part of the pressing groove shown to (A) partially. It is a top view which expands and shows. (A) And (B) is explanatory drawing which shows typically the pattern which squeezes the protrusion part of a surface sheet with the pressing groove as a leak-proof groove of this embodiment, (C) is the conventional linear form. It is explanatory drawing which shows typically the pattern which squeezes the protrusion part of a surface sheet with a pressing groove. (A) is sectional drawing which shows typically the RA-RA line cross section of FIG. 4 (A), (B) is sectional drawing which shows typically the RB-RB line cross section of FIG. 4 (A). (A) is a top view which shows the arrangement | positioning relationship between the arrangement | sequence of the pocket part which the arch-shaped leak-proof groove | channel shown in FIG. 5 has, and a liquid-receiving area | region, (B) is the pocket part which a linear leak-proof groove has. It is a top view which shows the arrangement | positioning relationship between the arrangement | sequence and liquid receiving area | region. (A) is a top view which shows typically the other preferable aspect of the wave shape of the pressing groove as a leak-proof groove in this embodiment, (B) is a partial outer curved part of the pressing groove shown to (A). FIG. (A) is sectional drawing which shows typically the RC-RC line cross section of FIG. 8 (A), (B) is sectional drawing which shows typically the RD-RD line cross section of FIG. 4 (A). FIG. 9 is a plan view schematically showing an aspect in which the curvature of the groove edge on the inner side in the width direction (liquid receiving region side) and the curvature of the groove edge on the outer side in the width direction (outer edge side) are different in the compressed groove shown in FIG. 8. It is explanatory drawing which shows typically the relationship between the wave height of the waveform of the pressing groove as a leak-proof groove, and the uneven | corrugated pitch of a surface sheet, (A) is the surface sheet of FIG. 2, and the pressing groove of FIG. (B) shows the combination of the top sheet of FIG. 2 and the pressing groove of FIG. 4, and (C) shows the combination of the top sheet of FIG. 3 and the pressing groove of FIG. And (D) has shown the combination of the surface sheet of FIG. 3, and the pressing groove of FIG. It is the top view which showed typically the preferable aspect of the pressing groove which consists of a combination of a high pressing part and a low pressing part, (A) has shown the case of the pressing groove of FIG. 4, (B) and (C ) Shows the case of the pressing groove of FIG. 8, and (D) and (E) show the case of the pressing groove of FIG. (A) is explanatory drawing shown about the spread of the tension | tensile_strength at the time of setting it as the surrounding which surrounds a high pressing part with a low pressing part, (B) is the tension at the time of setting it as the arrangement | positioning which does not surround a high pressing part by a low pressing part. It is explanatory drawing shown about a ripple. It is explanatory drawing which shows typically arrangement | positioning when two or more pressing grooves as a leak-proof groove are arranged. (A) And (B) is explanatory drawing typically shown about the deformation | transformation when the external force from the width direction in the case of the arrangement structure of the pressing groove of FIG. 14 is applied, (C) and (D) are It is explanatory drawing typically shown about a deformation | transformation when the external force from the width direction in the case of the arrangement structure of the pressing groove of FIG. 1 is applied. FIG. 15 is a plan view schematically showing two pairs of non-squeezed areas arranged separately in the excretory part corresponding area of FIG. 14. (A) is a drawing-substituting photograph in which a cross section in the vicinity of the pressing groove in the sample of Example 1 is imaged, (B) is a drawing-substituting photograph in which a cross section in the vicinity of the pressing groove in the sample of Comparative Example 1 is imaged (C ) Is a representative photograph of a photograph taken from the top sheet of a leakage prevention test performed on the sample of Example 1 and 6 g injected, and (D) is 6 g of the sample of Comparative Example 1 as in Example 1. It is a drawing representative photograph which imaged the state of pouring from a surface sheet.

First, a sanitary napkin (hereinafter also referred to as a napkin) 10 as a preferred embodiment of an absorbent article in the present invention will be described with reference to the drawings.
A napkin 10 shown in FIG. 1 includes a top sheet 1 on the skin contact surface side, a back sheet 2 on the non-skin contact surface side, and an absorbent body 3 positioned between the top sheet 1 and the back sheet 2. In the present embodiment, side sheets 4 are further laminated on both sides of the surface sheet 1 on the skin contact surface side. The side sheet 4 and the back sheet 2 extend outward in the width direction of the absorber 3 to form a wing portion 5 that is a fixing means to the underwear or the like of the napkin 10. In the laminated structure of the sheets, the outer peripheral edge of the napkin 10 is an outer peripheral seal portion 9 joined without the absorbent body 3 interposed.

The topsheet 1 has a bulky structure including a concavo-convex surface without an embossed portion and a hollow portion on the skin side surface and the absorber side surface (non-skin contact surface side). The embossed portion referred to here is a portion provided in the surface sheet, which is higher in density than its surroundings and where the fibers are fused together, and that portion is not formed in the absorbent body. . Therefore, in other words, the embossed portion is a densified fusion portion that is provided on the top sheet and does not reach the absorber. Therefore, the pressing part 6 mentioned later is distinguished from the embossed part said here. As a surface sheet which has a bulky structure provided with the uneven surface and hollow part which do not accompany an embossed part, it describes in Unexamined-Japanese-Patent No. 2013-133574, for example. Thereby, the surface sheet 1 is soft as the part which touches a wearer's skin directly, air permeability is good, and it is hard to produce a liquid residue with quick liquid permeability.
On this surface sheet 1, a pair of left and right pressing grooves 6 as leak-proof grooves partially recessed from the surface sheet 1 to the absorber 3 are arranged in the width direction. The pair of left and right squeezing grooves 6 and 6 each have a wave shape extending in the longitudinal direction (Y direction) in a plan view of the topsheet 1. The wave shape is symmetrical with respect to the width direction center line L extending in the longitudinal direction of the napkin 10. Thereby, it becomes the napkin 10 which has widely the area | region where the said bulky structure of the surface sheet 1 was fully maintained in parts other than the pressing groove 6 including the periphery of the pressing groove 6. FIG.
Details of the bulky structure of the topsheet 1 and the wave shape of the compressed groove 6 will be described later.

  The napkin 10 has a vertically long shape having a longitudinal direction (Y direction) and a width direction (X direction) orthogonal to the longitudinal direction. A longitudinal direction is a direction which connects a wearer's skin side part and back side part via a crotch part at the time of mounting | wearing of the napkin 10. FIG. That is, when wearing the napkin 10, the topsheet 1 side is directed to the wearer's skin side, the longitudinal direction is arranged from the wearer's lower abdomen through the crotch part to the back side, and the width direction is left and right. It is worn with the feet facing the direction that connects them. At that time, the wing portions 5 and 5 are bent and wound around the crotch portion of the underwear, and the napkin 10 is fixed by an adhesive portion (not shown) included in the wing portion 5.

  The napkin 10 has the excretion part corresponding | compatible area | region C arrange | positioned corresponding to a wearer's excretion point. Furthermore, it can be classified as a front part F arranged in the lower abdomen in front of the excretory part corresponding region C, and as a rear part R arranged on the rear hip side. Moreover, in the width direction of the excretion part corresponding | compatible area | region C, the area | region which directly receives the excretion liquid inside especially the pressing grooves 6 and 6 mentioned later is called liquid receiving area | region C1. In the present embodiment, these three regions are regions in which the napkin 10 is divided into three equal parts in the longitudinal direction, and the region with the wing portion is the excretory portion corresponding region. This division can be set in accordance with the size of the absorbent article that varies depending on the purpose of use and the like. For example, when the napkin is formed symmetrically in the front-rear direction such as a daytime napkin, the excretion part corresponding region is the central part when the napkin is divided into three equal parts in the vertical direction. A night napkin or the like has a wide left and right rear flap that covers the buttocks at the rear, and therefore the excretory part corresponding region is closer to the front center when the napkin is divided into two equal parts in the longitudinal direction. In addition, regardless of whether it is daytime or nighttime, when a wing that is bent and fixed to the crotch part of the shorts is provided, the region where the wing exists becomes the excretion region corresponding region. On the other hand, when the wing portion is not provided, the excretory portion corresponding region is generally a central region when the napkin 10 is divided into three equal parts in the longitudinal direction Y.

  In the present invention, unless otherwise specified, the side in contact with the human body is referred to as the skin surface side or the skin contact surface side or the surface side, and the opposite side is referred to as the non-skin surface side or the non-skin contact surface side or the back surface side. That's it. The direction positioned on the front side of the human body when worn is referred to as the front, and its end is referred to as the front end, and the direction positioned on the rear is referred to as the rear, and the end is referred to as the rear end. Moreover, the normal line direction of the surface or back surface of an absorbent article is called thickness direction, and the quantity is called thickness.

  Next, the top sheet 1 will be described.

The topsheet 1 has a concavo-convex surface 11 without an embossed part on each of the skin side surface Z1 and the absorber side surface (non-skin side surface) Z2 (the concavo-convex surface 11A for the skin side surface Z1 and the one on the absorber side surface Z2). It may be distinguished from the uneven surface 11B). In addition, the uneven | corrugated surface 11 means the part except the part directly squeezed by the pressing groove mentioned later. In the present embodiment, the concavo-convex surface 11 is disposed on the entire surface sheet 1 other than the compressed groove 6.
The topsheet 1 has a thickness due to the uneven surfaces 11 on both sides, and has a hollow portion in the thickness portion. Due to the uneven surface and the hollow portion, the surface sheet 1 is bulky and soft to the touch, and is excellent in air permeability. Moreover, since the uneven surface has no embossed portion, there is no hardened portion, the deformation due to body pressure is smooth, and the followability to the skin and the fit property are excellent. Such a surface sheet 1 is particularly preferably an air-through nonwoven fabric formed by an air-through method. Moreover, it is preferable that the surface sheet 1 consists of one nonwoven fabric from a soft viewpoint.

  A specific example of the topsheet 1 will be described with reference to FIGS. However, the surface sheet 1 is not limited to the form of FIG.2 and FIG.3, If both surfaces have a hollow part with the uneven surface which does not accompany embossing, and a bulky thing can take various forms.

The topsheet 1A shown in FIG. 2 has a first protrusion 21 on the skin side surface Z1 and a second protrusion 22 on the absorber side surface Z2 that protrudes in the opposite direction to the first protrusion 21. A plurality of first protrusions 21 and second protrusions 22 are alternately arranged in different directions intersecting in plan view. The different directions are, for example, the longitudinal direction (Y direction) and the width direction (X direction) of the napkin 10. However, the different directions that intersect are not limited to the orthogonal X and Y directions, but include different directions that intersect at various angles. A plurality of such alternate arrangements are arranged in the sheet plane direction. In this plurality of arrangements, it is a staggered arrangement in which the alternate arrangement of the first protrusions 21 and the second protrusions 22 is shifted by a half pitch between the adjacent parallel running arrays. It is preferable from the viewpoint of making the load of pressure as uniform as possible and improving shape retention.
The 1st protrusion part 21 has the hollow part 21K, and the 2nd protrusion part 22 has the hollow part 22K. The hollow portion 21K of the first projecting portion 21 is an internal space opened at the absorber side surface Z2, and forms a recess in the absorber side surface Z2 (hereinafter also referred to as an absorber-side recess 21K). The hollow portion 22K of the second projecting portion 22 is an internal space opened at the skin side surface Z1, and forms a recess in the skin side surface Z1 (hereinafter also referred to as a skin side recess 22K). Thereby, the skin side surface Z1 of the surface sheet 1 has the uneven | corrugated surface 11A by which the 1st protrusion part 21 and the skin side recessed part 22K were alternately distribute | arranged alternately by each in the different direction which planar view crosses. Moreover, the absorber side surface Z2 of a 1st nonwoven fabric sheet has the uneven | corrugated surface 11B by which the 2nd protrusion part 22 and the absorber side recessed part 21K were alternately distribute | arranged alternately in each different direction which planar view crosses.

  The top sheet 1A has a structure in which the first projecting portion 21 and the second projecting portion 22 are connected in the plane direction without an embossed portion, except for a pressing groove 6 described later. Further, the top sheet 1A of the present embodiment does not have a bent portion, and is configured by a continuous curved surface as a whole. Here, “continuous” means that there are no broken portions of fibers or through holes. This through-hole does not mean a fine hole such as a gap between fibers, but is a portion where fibers are cut off. For example, a hole having an equivalent circle diameter of 1 mm or more can be defined as a through hole. The top sheet 1 does not have such a through hole.

  In this embodiment, the 1st protrusion part 21 and the 2nd protrusion part 22 are made into the truncated cone shape or hemisphere which rounded the top part. That is, each of the first projecting portion 21 and the second projecting portion 22 is not a streak but an independent dome-shaped projecting shape. The first projecting portion 21 and the second projecting portion 22 are not limited to the above-described shapes, and may have any form as long as they are independent projecting shapes, for example, various cone shapes (in this specification, cones It is practical that the shape includes a cone, a truncated cone, a pyramid, a truncated pyramid, an oblique cone, etc.). In the present embodiment, the internal spaces 21K and 22K of the first protrusion 21 and the second protrusion 22 are frustoconical or hemispherical spaces with rounded tops similar to the outer diameters of the protrusions.

  In the skin side surface Z1 and the absorber side surface Z2 of the topsheet 1A, the opening portions of the hollow portion 21K and the hollow portion 22K are ridge portions 23 that connect the first projecting portions 21, 21 and the second projecting portions 22, 22. It is an independent space separated. In the sheet thickness direction of the topsheet 1, the first protruding portion 21 and the second protruding portion 22 are connected via a wall portion 24, and the wall portion 24 divides the internal spaces 21 </ b> K and 22 </ b> K. The wall portion 24 has a shape that is annular in the plane direction so as to surround the internal space, and the ring is continuous in the sheet thickness direction. The “ring” here is not particularly limited as long as it has an endless series of shapes in plan view, and may be any shape such as a circle, an ellipse, a rectangle, or a polygon in plan view. In order to maintain the continuous state of the sheet suitably, a circle or an ellipse is preferable. The top sheet 1 in FIG. 2 has a sheet structure in which both protruding portions are continuous via the wall portion 24 and the ridge portion 23.

  Moreover, the wall part 24 has the fiber orientation along the standing direction in any point along a ring. In other words, the wall 24 has a radial fiber orientation that converges toward the vertex 22T of the second protrusion 22 in relation to the second protrusion 22. Specifically, the fiber orientation described in paragraphs [0014] to [0020] of JP2012-136790A.

  In the sheet thickness when the whole surface sheet 1A is viewed, the first protruding portion 21, the wall portion 24, and the second protruding portion 22 are typically defined as portions divided into three equal parts. These thicknesses are naturally determined by the sheet thickness (P1 = P2 = P3). However, when the kurtosis or curvature of the top of the first protrusion 21 and the second protrusion 22 is different, a relatively narrow portion that is linear in the cross section is used as the wall 24, and is curved and rounded therefrom. It is good also considering the area to go as the 1st protrusion part 21 and the 2nd protrusion part 22, respectively. In the latter definition, for example, when the first protrusion 21 is a gentle curved surface having a smaller curvature (larger radius of curvature) than the second protrusion 22, the second protrusion 22 is the first protrusion. 1 is long in the thickness direction of the sheet, and the whole is biased in the thickness direction.

The top sheet 1A has excellent cushioning properties.
The surface sheet 1A has a three-dimensional cushioning property that makes contact with other members and skin in a small area on both sides, and flexibly deforms following the three-dimensional movement of the members and skin. . Moreover, by having the hollow portions 21K and 22K, the touch when the skin touches the top sheet 1A becomes a soft cushioning property. In addition, the first projecting portion 21 and the second projecting portion 22 can be independently deformed without interfering with each other due to the interposition of the wall portion 24 and have a three-dimensional cushioning property. Further, the annular wall portion 24 connects the first projecting portion 21 and the second projecting portion 22 to disperse the stress applied to one projecting portion in an annular shape, thereby reducing the ripple to the other projecting portion. Thereby, it has the cushioning property which the surface sheet 1A whole does not collapse completely. In addition, due to this stress distribution, the shape retention of the entire topsheet 1A is high, and the shape restoring force is large even when crushed. In addition, the wall 24 has a fiber orientation along the standing direction at any point of the ring as described above, so that a firm stiffness is produced and the cushioning property is enhanced.
As a result, the top sheet 1A is unlikely to lose its initial cushioning property even if the packing state and wearing of the napkin 10 are continued, for example.

The top sheet 1A is highly liquid permeable and hardly retains liquid, and has excellent air permeability.
The top sheet 1A has a bulkiness that separates the skin and the absorbent body by the protruding portions on both sides, and has excellent liquid permeability due to the hollow portions 21K and 22K on both sides, so that the liquid hardly remains. At the same time, the permeated liquid is difficult to return to the skin side. Further, the structure in which both surfaces are in contact with each other with a small area and the hollow portions 21K and 22K suppress the contact area with the skin and have excellent air permeability. As a result, after a urine, stool, menstrual blood, and excretion of the urine, a very smooth and dry feeling can be sustained widely.
Particularly, in the plurality of independent hollow portions 21K and 22K, the excretory liquid can be dispersed and collected and quickly separated from the skin. Thereby, it can be quickly delivered to the absorber 3 without retaining the liquid on the surface of the topsheet 1A. Specifically, when the excreta is high in viscosity such as menstrual blood or loose stool and has low permeability, it is once dispersed and collected into the skin side concave portion (hollow portion of the second protruding portion) 22K of the skin side surface Z1. It is possible to effectively suppress contact with the skin. In addition, the liquid once collected is taken in and collected from the wall 24 into the internal space 21 </ b> K of the first protrusion 21. Further, when the excrement is low in viscosity of clay such as urine and has high permeability, it is directly permeated from the first projecting portion 21, and the absorber-side concave portion (the hollow of the first projecting portion 21 is formed on the absorber side surface Z <b> 2. Part) 21K is also taken in. Thereby, excrement dispersion collection in laminated nonwoven fabric 10 is promoted, and it is efficiently handed over to absorber 3, and has high liquid permeability.

  The topsheet 1 may be a topsheet 1B as shown in FIG. 3, for example, in addition to the topsheet 1A.

In the surface sheet 1B shown in FIG. 3, the 3rd protrusion part 25 of the skin side surface Z1 and the 4th protrusion part 26 of the absorber side surface Z2 have a stripe-like protrusion shape extended in the longitudinal direction (Y direction). . The 3rd protrusion part 25 and the 4th protrusion part 26 protrude in the mutually opposite direction, and are arrange | positioned alternately in the width direction (X direction), and have a waveform shape like a tin.
The 3rd protrusion part 25 has the hollow part 25K, and the 4th protrusion part 26 has the hollow part 26K. The hollow portion 25K of the third projecting portion 25 is an internal space opened at the absorber side surface Z2, and forms a streak-like recess on the absorber side surface Z2 (hereinafter also referred to as an absorber-side recess 25K). The hollow portion 64K of the fourth projecting portion 26 is an internal space opened at the skin side surface Z1, and forms a streak-like concave portion of the skin side surface Z1 (hereinafter also referred to as a skin side concave portion 26K). Thereby, the skin side surface Z1 of the topsheet 1B has a concavo-convex surface 11A in which a plurality of third projecting portions 25 and skin-side concave portions 26K extending in the longitudinal direction are alternately arranged in the width direction. Moreover, the absorber side surface Z2 of a 1st nonwoven fabric sheet has the uneven surface 11B by which the 4th protrusion part 26 extended in a longitudinal direction and the absorber side recessed part 25K were alternately arranged with two or more by the width direction.
This surface sheet 1B is also constituted by a continuous curved surface without a bent portion, with the third protruding portions 25 and the fourth protruding portions 26 continuously and continuously without an embossed portion, except for a pressing groove 6 described later. Has been. Thereby, the surface sheet 1B has the bulkiness which separates skin and an absorber, and has the outstanding cushioning property. Further, due to the bulkiness and liquid permeability due to the hollow portion, the liquid hardly remains and the liquid does not easily return. In addition, it has excellent breathability and tends to sustain a dry feeling when worn.

The napkin 10 includes the top sheet 1 as described above, and has at least a pair of compressed grooves 6 that are partially recessed from the top sheet 1 to the absorber 3 on the top sheet 1.
The pressing groove 6 is a portion where the constituent fibers of the member are crimped and consolidated by pressing. Blocks the liquid in the width direction by pressure bonding. In addition, the capillary force is higher than the other parts due to the consolidation, and the force to draw the liquid into the thickness direction acts strongly. Thus, the compressed groove 6 fulfills a blocking function against liquid transfer.

  Next, the pressing groove 6 as the leakage preventing groove will be described below. In addition, in this specification, a pressing groove is a groove | channel formed by pressing the surface sheet 1 and the absorber 3 integrally. In other words, the leak-proof groove has a structure having a compacted portion in which the topsheet and the absorber are recessed in an integrated compacted state, and the compacted portion has a groove shape that forms the bottom. The groove includes left and right side wall portions and a bottom portion. In the bottom portions of the compressed grooves 6 and 6, the top sheet 1 and the absorbent body 3 are compared with the peripheral portions of the compressed grooves, that is, the portions where the compressed grooves are not formed. Each density is higher. Therefore, the compressed groove is a groove in which at least the density of the bottom portion is higher than that of the peripheral portion. In the present specification, the “consolidated portion” is a recessed portion having a higher density than its surroundings, and typically, as in this embodiment, pressure is applied to the member to increase the density. It is created by the method.

  The pressing groove 6 has a wave shape extending in the longitudinal direction in plan view. That is, it is a shape that has a predetermined width in a plan view and is extended linearly so that the outer edge hits a wave. The wave shape is symmetric with respect to the width direction center line L extending in the longitudinal direction. In this embodiment, the squeezing grooves 6 are arranged to extend in the longitudinal direction at positions on both the left and right sides of the excretory part corresponding region C. However, arrangement | positioning of the pressing groove 6 is not necessarily limited only to the excretion part corresponding | compatible area | region C, and may extend from the excretion part corresponding | compatible area | region C to the front part F and the back part R. FIG.

  Further, in the present embodiment, each of the compressed grooves 6 and 6 has one large gentle arch (bow) shape in which the entire shape extending by connecting waves is curved outward in the width direction of the napkin 10. This arch shape enhances the tension relaxation action by the wave shape described later, and works to absorb and relax the pressure in the width direction when the napkin 10 is installed as a whole. Thereby, the twist of the member structure of the liquid receiving region C1 is suppressed, and the bulky structure of the double-sided uneven surface provided with the hollow portion of the topsheet is preferably maintained even during mounting.

  The specific example of such a pressing groove 6 is demonstrated below with reference to FIGS. However, the pressing groove 6 is not limited to these forms, and can take various forms as long as it has a corrugated shape capable of retaining the bulky structure of the topsheet 1.

First, FIG. 4 (A) shows a compressed groove 6A as an example.
The compressed groove 6 in FIG. 4A has a shape that meanders with a constant groove width. That is, the compressed groove 6 </ b> A has a predetermined width t between the inner groove edge 61 on the inner side in the width direction (liquid receiving region side) of the napkin 10 and the outer groove edge 62 on the outer side in the width direction (outer edge side) of the napkin 10. A curved shape meandering on the extension line of the groove while maintaining. Thereby, the continuous crushing of the protrusion part of the surface sheet 1 by the linear pressing groove 99 as shown in FIG.5 (C) is avoided in the edge of the extension line of the pressing groove 6A. As a result, a region in which the protruding portion of the topsheet 1 remains in the periphery or edge of the compressed groove 6A is created. For example, in 1 A of surface sheets, the 1st protrusion part 21 and the 2nd protrusion part 22 continue discontinuously in the periphery along the wave of the pressing groove 6A (refer FIG. 5 (A)). In the topsheet 1B, the streak-like third projecting portion 23 and the fourth projecting portion 24 are stopped by the partial squeezing by the waves of the squeezing groove 6A (see FIG. 5B). Thereby, the bulkiness by the double-sided uneven surface of the surface sheet 1 relaxes the hardness around the compressed groove 6A, softens the outer edge portion of the napkin 10, and provides a good wearing feeling. 5A to 5C, the shaded portion indicates a portion where the protruding portion is crushed.

In addition, there is a pocket portion 12 of the topsheet 1 surrounded by the compressed groove 6A on the inner side (liquid receiving region C1 side) of the outer curved portion 63 that swings outward in the width direction of the compressed groove 6A (see FIG. 4B). ). In the pocket portion 12, there is a bulky structure of the concavo-convex surface of the surface sheet 1 having a hollow portion (see FIG. 6A). Therefore, the liquid permeability described above of the topsheet 1 is exhibited while being at a position near the outer peripheral edge of the napkin 10 in the width direction. The liquid permeation function by the squeezing groove 6A is aided by suppressing the amount of liquid that the liquid permeability diffuses. Further, the outer curved portion 63 has the capillary force described above as a part of the compressed groove 6A. When the outer curved portion 63 surrounds the pocket portion 12, it acts in a direction of encouraging liquid permeation through the top sheet while enclosing the liquid in the pocket portion 12 and temporarily holding the liquid in the pocket portion 12. The pocket portion 12 is effective for suppressing the lateral leakage of the liquid due to the interaction between the top sheet 1 and the outer curved portion 63 of the compressed groove 6A. Furthermore, since the hollow part of the surface sheet 1 exists in the pocket part 12, the texture is good and the liquid return from the absorbent body hardly occurs. Moreover, in this pocket part 12, since the moderate distance to 6 A of pressing grooves can be maintained, the liquid which fell from the protrusion part becomes difficult to exceed 6 A of pressing grooves, and it is effective also in the side leakage suppression of a liquid also in this point.
Moreover, since the whole pressing groove 6A is the above-mentioned arch shape, there are more pocket portions 12 than the linear pressing groove, and there are pockets so as to surround the liquid receiving region (FIG. 7A). (See (B)). Thereby, the arch-shaped compressed groove 6A is more effective in suppressing side leakage than the linear-shaped compressed groove. More specifically, the arch-shaped compressed groove 6A in FIG. 7A has a longer distance from the pocket portion 12 and the liquid receiving region C1 than the linear compressed groove in FIG. 7B. A relatively constant distance is maintained without moving away from the center to the front and rear. Thereby, the plurality of pocket portions 12 of the compressed groove 6A can be received so as to surround the liquid diffusing in all directions from the liquid receiving region C1, and is very useful for preventing the liquid from leaking from the lateral direction. is there.

In addition, since the wavy shaped pressing grooves 6A and 6A are arranged symmetrically, the outer curved portions 63 swaying outward are arranged opposite to each other as shown in FIG. Thereby, the distance W1 (distance between the inner groove edges 61 and 61) between the outer side curved parts 63 and 63 spreads rather than between normal linear pressing grooves, and the tension | tensile_strength with respect to the surface sheet 1 in the meantime is reduced. . As a result, in the region in the width direction from the periphery of the outer curved portions 63, 63 to the liquid receiving region C1, the hollow portion of the topsheet 1 is prevented from being crushed and the internal space tends to remain. And the bulkiness by both surface unevenness | corrugation of the surface sheet 1 is maintained, and the high cushioning property mentioned above, the soft touch by it, and the outstanding liquid permeability and air permeability are fully expressed. In addition, as described above, each of the compressed grooves 6A and 6A as a whole has one large gentle arch shape curved outward in the width direction, which acts in the direction of weakening the tension, and the action of the topsheet 1 Contribute to.
Furthermore, as shown in FIG. 4A, the inner curved portions 64 and 64 that are swung inward in the width direction are also arranged to face each other. The distance W2 between the inner curved portions 64 and 64 is shorter than the distance W1 between the outer curved portions 63 and 63, and the tension F with respect to the topsheet 1 is relatively strong (see FIG. 6B). . Thereby, between the inner side curved parts 64 and 64, the liquid drawing force of the thickness direction in the pressing groove 6A acts strongly.
Thus, between the pair of wave-shaped compressed grooves 6A, 6A, along the longitudinal direction of the napkin 10, there are alternately portions where the tension on the topsheet 1 works strongly and portions where the tension works weakly. Thereby, the cushioning property and liquid permeability due to the bulkiness of the topsheet 1 and the liquid blocking function by the pressing groove 6A act in a well-balanced manner.

  Moreover, the same effect | action arises also in the width direction outer side of the pressing groove 6A, the hardness felt in an inseam is further relieve | moderated, and a favorable dry feeling is given without a liquid residue. On the outside of the inner curved portion 64, as shown in FIG. 6 (B), there is a bulky structure of the uneven surface of the topsheet 1, resulting in cushioning and soft touch, and high liquid permeability and good dry feeling can be obtained. . In addition, outside the outer curved portion 63, the distance from the outer peripheral seal portion 9 is shorter than the inner curved portion 64, and the function of blocking the liquid works by the tension of the compressed groove 6A. Therefore, along the width direction of the napkin 10, different actions are manifested on the inner side in the width direction (the liquid receiving region C1 side of the napkin 10) and on the outer side in the width direction (the outer edge side of the napkin 10). Thereby, the cushioning property and liquid permeability by the bulkiness of the surface sheet 1 and the liquid blocking function by the pressing groove 6A function in a more balanced manner in the whole napkin 10.

  Further, the wave-shaped compressed groove 6A includes an outer curved portion 63 and an inner curved portion 64, and does not include a straight portion. That is, it has a curved shape without a bent portion. As a result, the liquid puddle is hardly generated at the bent corner, and the dry feeling is excellent. Further, the external force at the time of wearing does not have an angular deformation at the bent portion, and becomes a soft flexible deformation, so that a soft touch is maintained. Moreover, it becomes easy to fit skin.

  The wave shape of the compressed groove 6 may be a shape having a constriction in the width direction as shown in FIG. 8A in addition to the meandering shape shown in FIG.

  The compressed groove 6B in FIG. 8A has a width between the inner groove edge 61 on the inner side in the width direction (liquid receiving region side) of the napkin 10 and the outer groove edge 62 on the outer side in the width direction of the napkin 10 (outer edge side). It is not constant and has a plurality of maximum widths tm and minimum widths ts alternately. The wave shape of the compressed groove 6 is a shape in which the inner groove edge 61 and the outer groove edge 62 are gently connected by a curve between the maximum width tm and the minimum width ts. The portion with the minimum width ts is the constricted portion 65. On the other hand, the portion having the maximum width tx is referred to as a widened portion 66. The width of the groove gradually changes between the constricted portion 65 and the widened portion 66, and the corrugated shape of the compressed groove 6B is obtained. Therefore, in this case as well, it has a curved shape with no bent portion and no straight portion.

In the pressing groove 6B of FIG. 8A, on both sides (the liquid receiving region side and the outer edge side) of the constricted portion 65, there is a bulky structure of the concavo-convex surface on both sides having a hollow portion of the topsheet 1 (FIG. 9 ( A)). In addition, since the constricted portion 65 itself has the minimum width ts, the rigidity is not high as compared with other portions of the compressed groove 6B. With such a configuration, the softness around the constricted portion 65 becomes higher than that of the above-described compressed groove 6A. On the other hand, the widened portion 66 has the highest liquid blocking function with the maximum width tm. In addition, on the inner side in the width direction of the constricted portion 65 of the compressed groove 6B, there is a pocket portion 12 similarly to the compressed groove 6A (see FIG. 8B). This pocket part 12 expresses the enclosure of the liquid by the interaction between the above-described bulky surface sheet 1 and the corrugated compressed groove 6B, and is effective in suppressing the lateral leakage of the liquid.
Furthermore, the corrugated shape of the compressed groove 6B is symmetric with respect to the width direction center line L extending in the longitudinal direction. Thereby, between the pressing grooves 6B and 6B, the part where the strong tension FT with respect to the top sheet works and the part where the weak tension FS works are alternately arranged along the longitudinal direction of the napkin 10 as in the case of the pressing part 6A. (See FIGS. 8A, 9A, and 9B). Furthermore, the strength of the tension becomes a repetitive pattern similar to that on the inner side in the width direction on the outer sides in the width direction of the compressed grooves 6B and 6B. Thereby, the cushioning property and liquid permeability due to the bulkiness of the topsheet 1 and the liquid blocking function are exerted in a balanced manner by the pressing groove 6B. In addition, as described above, each of the compressed grooves 6B, 6B as a whole is one large gentle arch shape curved outward in the width direction, which acts in the direction of weakening the tension, and the action of the topsheet 1 Contribute to.

In the squeezing groove 6B, it is preferable to set the wave height of the portion protruding in the width direction of the corrugated shape as follows in order to make sure the lateral leakage of the liquid as well as the softness. That is, the wave height of the portion protruding in the width direction of the wave shape is different between the inner side in the width direction and the outer side in the width direction of the napkin 10, and the wave height on the inner side in the width direction (inner groove edge 61 side) is the outer side in the width direction. It is preferable that the height of the wave on the outer groove edge 62 side is larger (see FIG. 10).
Thereby, the liquid blocking function can be concentrated on the liquid receiving area side and enhanced, and the rigidity of the portion corresponding to the vicinity of the crotch on the outer side in the width direction of the napkin 10 can be relaxed. Further, by increasing the height of the wave on the inner side in the width direction of the widened portion 66, the inner groove edge 61 connecting the constricted portion 65 and the widened portion 66 can be made long, which is effective in preventing leakage. In addition, the pocket portion described above is enlarged, and can be temporarily retained by enclosing the liquid, which is effective for suppressing side leakage.

The height of the wave of the compressed groove 6 is the height of the wave of the portion protruding in the width direction at the edge of the groove in the plan view of the compressed groove 6. The height of the wave on the liquid receiving region side which is the inner side in the width direction is the length in the width direction between the apex 61T of the widened portion 66 and the bottom portion 61B of the constricted portion 65 at the inner groove edge 61 (difference in wave height). M1 (hereinafter referred to as wave height M1). The height of the wave on the outer edge side, which is the outer side in the width direction, is the length in the width direction between the top 62T of the widened portion 66 and the bottom 62B of the constricted portion 65 at the outer groove edge 62 (difference in wave height). M2 (hereinafter referred to as wave height M2).
It is preferable from the viewpoint of the above action that the wave height M1 on the liquid receiving region side is larger than the wave height M2 on the outer edge side. In this magnitude relationship, the difference in wave height (M1-M2) varies depending on the size of the article and cannot be determined unconditionally. For example, in the case of a sanitary napkin, 0.5 mm or more is preferable. 0 mm or more is more preferable. The wave height (M1-M2) is preferably 9.0 mm or less, and more preferably 5.0 mm or less. Specifically, the difference in wave height (M1-M2) is preferably 0.5 mm or more and 9.0 mm or less, and more preferably 1.0 mm or more and 5.0 mm or less. Such a magnitude relationship is preferably established at the same position in the longitudinal direction.

Furthermore, in any form of the pressing groove 6, it is preferable to have the following configuration from the viewpoint of more reliably maintaining the bulky structure of the double-sided uneven surface having the hollow portion of the topsheet 1. That is, as shown in FIG. 11, it is preferable that the wave height M1 of the portion protruding in the width direction of the compressed groove 6 is smaller than the pitch M3 of the unevenness in the width direction of the topsheet 1. Thereby, the area | region where the pressing groove 6 and the protrusion part of the surface sheet 1 overlap becomes small, and the uneven surface of the surface sheet 1 becomes difficult to be crushed around the pressing groove 6, and it is preferable.
The wave height of the compressed groove 6 here is the wave height of the portion protruding in the width direction defined above. Typically, it is the height difference of the wave at the inner groove edge 61. For example, in the compressed groove 6B, as described above, the length in the width direction between the apex 61T of the inner groove edge 61 of the widened portion 66 and the bottom point 61B of the inner groove edge 61 of the constricted portion 65 (difference in wave height). ) Means M1. Further, in the compressed groove 6A, the length in the width direction between the apex 61T closest to the liquid receiving region side of the inner groove edge 61 on the meandering line and the bottom point 61B farthest from the liquid receiving region side (wave wave) It means the difference in height.
Moreover, the uneven | corrugated pitch M3 of the width direction of the surface sheet 1 is the length between the protrusion parts of the width direction when a protrusion part and a recessed part are made into 1 set of repeating units in the skin contact surface side of the surface sheet 1. Means.

The ratio (M1 / M3) of the wave height (M1) of the compressed groove 6 to the uneven pitch (M3) of the surface sheet 1 is preferably 0.9 or less from the viewpoint of maintaining the unevenness of the surface sheet 1. 0.8 or less is more preferable, and 0.7 or less is more preferable. The ratio (M1 / M3) is preferably 0.1 or more, more preferably 0.2 or more, and still more preferably 0.3 or more, from the viewpoint of maintaining the hollow structure in the pocket portion. More specifically, the ratio (M1 / M2) is preferably from 0.1 to 0.9, more preferably from 0.3 to 0.8, and still more preferably from 0.5 to 0.7.
The wave height (M1) of the compressed groove 6 varies depending on the size and use of the absorbent article to be applied. For example, in the case of a sanitary napkin, 1 mm or more is preferable from the viewpoint of preventing menstrual bleeding. More preferably, it is 5 mm or more, and more preferably 2 mm or more. Further, the wave height (M1) is preferably 10 mm or less, more preferably 8 mm or less, and even more preferably 6 mm or less, from the viewpoint of suppressing the area of the compressed groove part where rigidity is increased and eliminating the discomfort.
The pitch (M2) of the unevenness of the topsheet 1 varies depending on the size and application of the absorbent article to be applied. For example, in the case of a sanitary napkin, the bulky structure of the topsheet is maintained and the cushioning property at the time of wearing is improved. In view of the above, 2 mm or more is preferable, 2.5 mm or more is more preferable, and 3 mm or more is more preferable. The pitch (M2) is preferably 12 mm or less, more preferably 10 mm or less, and even more preferably 8 mm or less, from the viewpoint of maintaining the smooth feel of the topsheet.

  Moreover, even if the pressing groove 6 is any form, in the thickness direction of the napkin 10, it is preferable to combine the high pressing part 67 and the low pressing part 68 which are not the same pressing depth but different depth. . The high pressing portion 67 is a portion where the depth of the groove is deeper than that of the low pressing portion 68, and the density of the groove bottom portion is higher than the density of the groove bottom portion of the low pressing portion 68. In the low pressing part 68, the tension | tensile_strength with respect to the surface sheet 1 is relieve | moderated rather than the high pressing part 67, and the bulky structure of the double-sided uneven surface which has a hollow part of the surface sheet 1 becomes still more difficult to crush. Moreover, by this, the soft touch by the wavy shaped pressing part 6 of the napkin 10 and the outstanding softness | flexibility can further be improved.

As a specific aspect, the arrangement as shown in FIGS. FIG. 12 (A) shows the compressed groove 6A as a high-pressure squeezed portion 67 and a low-pressure squeezed portion 68. FIGS. 12 (B) to 12 (E) show the compressed groove 6B as a high-pressure squeezed portion 67 and a low-pressure squeezed portion 68. It is made up of. FIG. 1 (A) shows a mode in which the high-pressure squeezed portion 67 is in a portion swung to the inside and outside in the width direction of the squeezed groove 6A. 12 (B) to (E) show an embodiment (FIGS. 12 (B) and (D)) in which the high pressing portion 67 is in the widened portion 66, and an embodiment in which the high pressing portion 67 is in the constricted portion 65 (FIG. 12 (C). ) And (E)). Any aspect may be sufficient. However, from the viewpoint of creating the softness of the topsheet 1 by the constricted portion 65 and sharing the function of blocking the liquid by the widened portion 66, a mode in which the high pressing portion 67 is in the widened portion 66 is more preferable.
Moreover, even if it is any aspect, the high pressing part 67 is the arrangement | positioning enclosed by the low pressing part 68 from a viewpoint which balances the stepwise and reliable interruption | blocking function with respect to a liquid transfer, and further softness. preferable. In other words, an arrangement in which the front, rear, left and right outer peripheries of the high-pressure squeezed part 67 are surrounded by the low-pressure squeezed part 68 is preferable. In this case, the wave shape of the compressed groove 6 (6 </ b> A, 6 </ b> B), that is, the wave struck by the inner groove edge 61 and the outer groove edge 62 is formed by the low pressure portion 68. Thereby, the tension of the high-pressure squeezed part 67 is difficult to be transmitted to the outside of the groove edge of the squeezed groove 6 through the low-pressure squeezed part 68 having a lower tension than this. As a result, the tension relaxation due to the wave shape and the symmetrical arrangement described above is further enhanced, and the bulky structure of the topsheet is more easily maintained. In addition to the liquid permeability described above due to the bulky structure of the topsheet 1, the low-pressure squeezed part 68, the high-pressure squeezed part 67 and a stepwise protective wall are provided in the liquid transfer direction. That is, in cooperation with the action of the surface sheet 1, the liquid transfer can be effectively blocked by the two-stage structure of pressure bonding and the two-stage structure of capillary force due to the gradient of fiber density.

The effect | action of comprising the pressing groove 6 with the high pressing part 67 and the low pressing part 68 is demonstrated with reference to FIG. 13 (A) and (B).
FIG. 13 (A) shows an aspect in which the high pressing portion 67 is surrounded by the low pressing portion 68 in the width direction of the napkin 10. That is, the low pressing part 68 is adjacent to the outer periphery of the high pressing part 67 and forms an inner groove edge 61 on the inner side in the width direction of the pressing groove 6 (not shown, but the low pressing part 68 is The outer groove edge 62 is formed on the outer side in the width direction. On the other hand, in FIG. 13 (B), the pressing groove 6 to the inner groove edge 61 is formed only by the high pressing portion 67 in the width direction of the napkin 10. The high pressing part 67 squeezes the top sheet 1 and the absorbent body 3 in both figures, and crimps the napkin 10 by reducing the thickness H1 to the thickness H2. On the other hand, in the low pressing part 68, as shown to FIG. 13 (A), the surface sheet 1 and the absorber 3 are made into pressing weaker than the high pressing part 67, and the thickness H1 of the napkin 10 is stopped to thickness H3. Therefore, the thickness H2 of the high pressing portion 67 is made thinner than the thickness H3 of the low pressing portion. At this time, in the bottom 67T of the high-pressure squeezed part 67, a tension F1 that tries to draw the top sheet 1 of the non-squeezed part is applied by pressure bonding. In the low pressure portion 68, a tension F2 that is weaker than the tension F1 works.
In the embodiment shown in FIG. 13B without the low-pressure portion 68, the tension F1 of the bottom portion 67T acts directly on the topsheet 1 of the peripheral portion W that is not compressed. On the other hand, in the aspect of FIG. 13A surrounded by the low pressing portion 68, the spread of the tension F1 of the bottom portion 67T is protected by the crimping portion at the bottom portion 68T of the low pressing portion 68. Therefore, the tension F2 of the bottom 68T of the low-pressure squeezed part 68, which is weaker than the tension F1, acts on the surface sheet 1 of the peripheral part W that is not squeezed. As a result, the influence of the tension of the pressing groove 6 is further weakened on the top sheet 1. This further helps to relieve the tension due to the squeezed grooves 6 being wave-shaped and symmetrical, and the bulky structure of the topsheet 1 is more easily maintained. Moreover, tension | tensile_strength is weakened also with respect to the part which avoided the direct pressing of the protrusion part of the surface sheet 1 with the wave shape of the pressing groove 6. FIG. For this reason, the surface sheet 1 adjacent to the pressing groove 6 is softer, excellent in air permeability, and maintains high liquid permeability.

Further, the napkin 10 may have a plurality of pairs of the left and right compressed grooves 6 described above. In this case, it is preferable that the pair of pressing grooves 6 having the widest separation area between the pressing grooves adjacent in the width direction are in the liquid receiving area C1 of the excretory part corresponding area C.
As a specific example of the multiple pairs, the embodiment shown in FIG. 14 can be cited. In FIG. 14, a pair of pressing grooves 6Q and 6Q and a pair of pressing grooves 6R and 6R are arranged on the front part F and the rear part R of the pair of pressing grooves 6P and 6P, respectively. Furthermore, the pair of pressing grooves 6S and 6S is arranged at positions spaced apart from each other in the width direction of the pressing grooves 6P and 6P.
The squeezing part 6P is one large gentle arch shape in which the entire shape extending by connecting waves is curved so as to surround the outer edge in the width direction of the liquid receiving region C1 of the excretory part corresponding region C. The compressed groove 6Q is connected to the other compressed groove 6Q on the front end side of the napkin 10 in an arc shape by connecting a wave with a shorter length than the compressed groove 6P and curving outward in the width direction. It has become. Similarly, the compressed groove 6R has a shorter length than the compressed groove 6P and draws one arc that is curved outward in the width direction and is connected to the other compressed groove 6R to form an arc. The pressing grooves 6S are arranged in pairs on the outer side in the width direction of the pressing grooves 6P. More specifically, the squeezing groove 6S draws an arc that is curved outward in the width direction by connecting waves so as to surround the outer edge side of the squeezing groove 6P with a shorter length than the squeezing groove 6P. Each squeezing groove is symmetrical with each other in pairs.
Further, the non-compressed areas 8 and 8 on both sides of the napkin 10 are provided between the compressed groove 6P and the compressed groove 6S. Moreover, in each of the left and right sides of the napkin 10, the pressing groove 6P and the pressing groove 6S are symmetrical. For this reason, a plurality of pocket portions 12 </ b> S with mutual waves drawn are arranged between the pressing portions 6 </ b> P and 6 </ b> S.
Furthermore, the pressing groove 6Q and the pressing groove 6R are connected to the front and rear ends of the pressing groove 6P, and there are connecting portions 69 at four front and rear left and right positions. Each connecting portion 69 is formed at a portion where the arch of each compressed portion enters inward in the width direction, and thus has a shape that is recessed inward in the width direction.

  In such a configuration having a plurality of pairs of compressed grooves, the area of tension relaxation due to the wave shape increases, and the bulky structure of the topsheet 1 is maintained in a wide range. In addition, the pressure absorption and relaxation by the squeezing grooves 6 can be further increased with respect to the external force in the width direction when the napkin 10 is mounted. Thereby, the twist of the member structure of the liquid-receiving area C1 is suppressed, and the bulky structure of the double-sided concavo-convex surface provided with the hollow portion of the topsheet is preferably maintained even when the napkin 10 is used. In addition, the liquid absorbability at the outer peripheral edge of the napkin 10 is further improved. As a result, even when there are various situations when the napkin 10 is worn (for example, situations such as momentary changes in posture during walking or work, continuation of sitting posture for a long time, etc.) It is preferable because it can prevent and achieve absorption well.

  For example, in the case of the embodiment of FIG. 14, as shown in FIGS. 15A and 15B, when the external force F9 from the crotch is applied, the pressing groove 6P receives the external force F9. At that time, the pressing groove 6P is connected to the front and rear pressing grooves 6Q and 6R by the connecting portion 69 to form a breakwater extending in the longitudinal direction of the napkin. Therefore, the external pressure F9 applied to the squeezing groove 6P is weakened inwardly in the liquid receiving region C1 with the rigidity of the front and rear squeezing grooves 6Q and 6R. In addition, since the connecting portion 69 has a shape that is recessed inward, the external force F9 is less likely to be connected to the front and rear compressed grooves 6Q and 6R and deformations in the vicinity thereof. Accordingly, the twist in the liquid receiving region C1 and the accompanying bulky structure of the topsheet 1 can be easily maintained even at the time of wearing, and appropriate liquid absorption is realized, which is preferable. Moreover, although not shown in figure, since the pressing groove 6S becomes a 1st breakwater with respect to an external pressure, it can further prevent the spreading of the external force to the inside of the liquid receiving area | region C1, and is preferable. On the other hand, when it consists of a pair of pressing grooves as shown in FIGS. 15C and 15D, the ripple of the external force F9 acts more strongly on the liquid receiving region C1 than in the above case depending on the strength of the force. There is a case. From this, it is more preferable to have a plurality of pairs of compressed grooves from the viewpoint of maintaining performance during use.

  Furthermore, the non-squeezing area | region 8 between the pressing groove 6P and the pressing groove 6S has the pocket part 12S which the mutual wave pulled, as shown in FIG. In the pocket part 12S, the bulky structure of the topsheet 1 remains. Thereby, quick liquid permeation acts also in this part, and it functions as a further breakwater for liquid leakage, which is preferable. Moreover, the part which hits an inseam by the pocket part 12S between the pressing groove 6P and the pressing groove 6S becomes still more preferable, and a soft touch is preferable.

  When it is the pressing groove 6 which combined the high pressing part 67 and the low pressing part 68, what kind of aspect may be sufficient as the planar shape of the high pressing part 67. FIG. In the case of the wave shape of the compressed groove 6 </ b> B, it is preferable that the front and rear ends of the planar shape of the high-pressure portion 67 taper in relation to the constricted portion 65. For example, a circle, an ellipse, a rhombus, etc. are mentioned.

  The method of forming the compressed groove 6 as described above can be performed by adopting a normal method used for this type of article. For example, the method of heat-sealing using the press roll (not shown) which the surface is uneven | corrugated and has a press part is mentioned. The shape of the pressing portion (height, width, uneven shape, etc.) can be appropriately set from the viewpoint of pressing strength and the like. Moreover, pressing strength and pressing depth can be adjusted by appropriately setting processing conditions such as pressing pressure, heating temperature (heat sealing temperature), and pressing time.

In the napkin 10, the bulky structure of the surface sheet 1 described above can employ various shaping methods for the nonwoven fabric as appropriate.
For example, in the case of the topsheet 1A shown in FIG. 2, in the air-through method, a fiber web is placed on a shaped support having an uneven surface, and the temperature and speed of the hot air to be blown are controlled to perform shaping treatment and heat. It can be obtained by performing a fusion treatment. For example, the method described in paragraph [0031] of JP2012-136790A or the methods described in paragraphs [0033] to [0061] of JP2012-149371A can be used. Examples of the shaped support used in this case include the support shown in FIG. 1 of JP 2012-149370 A, the support shown in FIGS. 1, 3 and 4 of JP 2012-149371 A, and the like. .
Further, in the case of the surface sheet 1B shown in FIG. 3, the intersections of the constituent fibers of the fiber web are heat-sealed to form a nonwoven fabric, and then carried between a pair of concave and convex (tooth gap) rolls that mesh with each other and stretched in one direction. Can be obtained.

  As the material for forming the top sheet 1, the back sheet 2, the absorber 3 and the side sheet 4 constituting the napkin 10, those used for this type of article can be used without particular limitation.

  For example, the top sheet 1 is made of a non-woven fabric, and as a forming material thereof, for example, a thermoplastic resin fiber subjected to a hydrophilic treatment, a fiber material described in paragraph [0032] of Japanese Patent Application Laid-Open No. 2012-136791 can be used. . Further, a liquid permeable sheet such as an apertured film may be combined with the nonwoven fabric. Regarding the forming material, a material obtained by hydrophilization treatment with a three-dimensional crimped fiber such as a secondary crimp or a tertiary crimp may be used. Specifically, polyethylene, polypropylene, polyester, nylon, and composite fibers thereof are prepared, and various hydrophilizing agents are applied at a stage before cutting into a predetermined length to form staples. Hydrophilic agents include various alkyl sulfonates represented by α-olefin sulfonates, acrylates, acrylate / acrylamide copolymers, ester amides, ester amide salts, polyethylene glycol and derivatives thereof, water-soluble Hydrophilic treatment with various commonly used hydrophilizing agents such as a basic polyester resin, various silicone derivatives, various saccharide derivatives, and mixtures thereof can be used.

As the back sheet 2, a moisture-impermeable or moisture-permeable film alone, a laminate of a film and a nonwoven fabric, or a water-repellent nonwoven fabric (such as SMS or SMMS) can be used. From the standpoint of cost and matching with an anti-displacement adhesive, it is most preferable to use a moisture permeable film alone as a leakproof material. In this case, as the moisture permeable film material, a film obtained by melt-kneading a thermoplastic resin and an inorganic filler not compatible with the thermoplastic resin and extruding the film to a predetermined dimension, or essentially, In addition, a non-porous film having high water compatibility and capable of discharging water vapor, such as a permeable membrane, can be used. In order to realize a leak-proof layer that fully expresses the performance of moisture discharge according to the present invention and does not exude moisture, the moisture permeability is 0.7 g / 100 cm ² hr or more and 3.0 g / 100 cm ² hr or less. Preferably, it is in the range of 1.0 g / 100 cm ² hr or more and 2.5 g / 100 cm ² hr or less. From the viewpoint of sufficiently improving the smoothness, it is most preferable that the amount is 1.5 g / 100 cm ² hr or more and 2.5 g / 100 cm ² hr or less. Further, since the film can be used without troubles such as breakage of the film basis weight 18 g / ^{m 2} or more 70 g / ^{m 2} or less, more preferably 25 g / ^{m 2} or more 60 g / ^{m 2} or less. Moreover, a preferable inorganic filler compounding quantity is 30 to 65 mass% as a mass% of the filler with respect to the mass of the whole film, More preferably, it is 40 to 60 mass%.

  Although there is no restriction | limiting in particular as a constituent material of the absorber 3, It is using the thing etc. which pinched | interposed the fiber material, the mixed fiber body of the fiber material and the porous body, etc. with the core wrap sheet (paper, a nonwoven fabric, etc.). it can. Examples of the fiber material include natural fibers such as wood pulp, cotton and hemp, polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate, and single fibers made of synthetic resins such as polyvinyl alcohol resin, and these resins. Bisynthetic fibers containing two or more of them, and semisynthetic fibers such as acetate and rayon can be used. When using a fiber made of a synthetic fiber, the fiber may be a heat-shrinkable fiber whose shape changes due to heat. For example, the fineness is increased by heat but the fiber length is shortened, and the fineness is hardly changed by heat, but the length occupied by the apparent fiber is shortened by changing the shape to a coil shape. Also good. As the porous body, sponge, non-woven fabric, aggregate of superabsorbent polymer (aggregate of superabsorbent polymer and fiber) and the like can be used.

  The side sheet 4 is preferably a water-repellent non-woven fabric and is made of a water-repellent material such as a non-woven fabric, spunbonded non-woven fabric, meltblown non-woven fabric, spunlace non-woven fabric, heat roll non-woven fabric, needle punched non-woven fabric manufactured by the card method. Various non-woven fabrics treated with water can be used. Particularly preferably, for example, a spunbond nonwoven fabric, a spunbond-meltblown (SM) nonwoven fabric, a spunbond-meltblown-spunbond (SMS) nonwoven fabric, or the like is used.

  The absorbent article of the present invention is not limited to the sanitary napkin of the above embodiment, and can be applied to, for example, incontinence pads, incontinence liners, urine collection pads, disposable diapers, and the like. Moreover, it is effective not only for menstrual blood but also urine, orimono, loose stool, and the like. In addition to the above-described constituent members, members may be incorporated as appropriate according to the application and function.

  This invention discloses the following absorbent articles further regarding embodiment mentioned above.

<1>
It has a top sheet on the skin contact surface side, a back sheet on the non-skin contact surface side, and an absorber positioned between the top sheet and the back sheet. An absorbent article having a longitudinal direction across the back side and a width direction orthogonal to the longitudinal direction,
The surface sheet has a concave and convex surface without an embossed portion and a hollow portion on the skin side surface and the absorber side surface, and a leak-proof groove partially depressed from the surface sheet to the absorber is the surface sheet. At least one pair on the left and right
The leak-proof groove is a structure having a compacted portion in which the topsheet and the absorber are recessed in an integrated compacted state,
The pair of left and right leakage prevention grooves have a wave shape extending in the longitudinal direction in the plan view of the top sheet, and the shape is bilaterally symmetric about a width direction center line extending in the longitudinal direction. Absorbent article.

<2>
The said leak-proof groove | channel is an absorbent article as described in said <1> whose width between the groove edge inside a width direction and the groove edge outside a width direction is constant.
<3>
The absorbent article according to <1>, wherein the leakage prevention groove has a constriction in the width direction.
<4>
The wave height of the portion protruding in the width direction of the wave shape of the leak-proof groove is different between the width direction inner side and the width direction outer side of the absorbent article, and the wave height on the width direction inner side is the width direction. The absorbent article according to any one of <1> to <3>, wherein the absorbent article is higher than an outer wave height.
<5>
The absorbent article according to any one of <1> to <4>, wherein the wave height of the portion protruding in the width direction of the leakage preventing groove is smaller than the uneven pitch in the width direction of the topsheet.
<6>
The ratio M1 / M3 of the wave height M1 of the leakage prevention groove to the pitch M3 of the unevenness of the surface sheet is 0.1 to 0.9, preferably 0.3 to 0.8, and more preferably 0.8. The absorbent article as described in said <5> which is 5 or more and 0.7 or less.
<7>
Any one of the above items <1> to <6>, wherein the wave height of the portion protruding in the width direction of the leak-proof groove is 1 mm to 10 mm, preferably 3 mm to 8 mm, more preferably 5 mm to 6 mm. Absorbent articles described in 1.
<8>
The said leak-proof groove | channel contains an high pressing part and a low pressing part, The said high pressing part is an absorbent article of any one of said <1>-<7> arrange | positioned mutually spaced apart.
<9>
The said high pressing part is an absorbent article as described in said <8> enclosed by the said low pressing part.
<10>
<1> to <9, wherein a plurality of the pair of left and right leakage prevention grooves are arranged, and the pair of leakage prevention grooves having the widest separation area between the leakage prevention grooves adjacent in the width direction is in the liquid receiving area. > Any one of>.
<11>
The absorbent article according to <3>, wherein the leakage preventing groove has a widened portion continuous with the constricted portion.
<12>
The said leak-proof groove | channel comprises a high pressing part and a low pressing part, The absorbent article as described in said <11> which has this high pressing part in the said widening part.
<13>
The said opening groove | channel is an absorbent article as described in said <11> which comprises a high pressing part and a low pressing part, and this high pressing part exists in the said constriction part.
<14>
The absorbent article according to any one of <1> to <13>, wherein the uneven surface of the surface sheet does not have a bent portion, and is configured as a continuous curved surface as a whole.
<15>
The top sheet has first protrusions protruding to the skin side and second protrusions protruding to the absorber side, and a plurality of the surface sheets are alternately arranged in different directions intersecting in plan view. The absorbent article according to any one of <14>.
<16>
In the topsheet, the absorbent article according to <15>, wherein the alternating arrangement of the first protrusions and the second protrusions is a staggered arrangement in which the first protrusions and the second protrusions are shifted by a half pitch.
<17>
The absorbent article <18> according to <15> or <16>, wherein the first protrusion and the second protrusion are conical.
The absorbent article according to <15> or <16>, wherein the first protrusion and the second protrusion have a truncated cone shape or a hemispherical shape with a rounded top.
<19>
The absorbent article according to any one of <1> to <14>, wherein the topsheet has a corrugated shape in which streaky irregularities are alternately arranged in the width direction.
<20>
The absorbent article according to any one of <1> to <19>, wherein the absorbent article has a plurality of pairs of left and right leakage prevention grooves.
<21>
In the excretion part corresponding region of the absorbent article that faces the excretion part of the wearer, a leak-proof groove that forms a pair across the liquid-receiving region and a leak-proof groove that forms a pair on the outer side in the width direction are disposed. The absorbent article as described in said <20>.
<22>
Each of the leak-proof grooves has one large gentle arch shape whose overall shape is curved outward in the width direction of the absorbent article, according to any one of <1> to <19>. Absorbent article.
<23>
The absorbent article according to any one of <1> to <22>, wherein the absorbent article is a sanitary napkin.

  Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited thereto.

Example 1
First, the nonwoven fabric shown in FIG. 2 was produced and cut into a size for a surface sheet. Specifically, a sheet manufactured by the method described in JP2013-133574A was used. The surface sheet has a basis weight of 12 g / m ^{2 at} 2.4 dtex in which the core is made of polyethylene terephthalate and the sheath is made of polyethylene in the upper layer, and 2.9 dtex fiber in which the core is made of polyethylene terephthalate and the sheath is made of polyethylene in the lower layer is 18 g / m ² . The total thickness of the topsheet was adjusted to 2.2 mm, adjusted to a total weight of 30 g / m ² so as to have a basis weight. In addition, the top sheet is 5 mm in distance between the tops of the skin-side protrusions adjacent in the width direction (X direction), and the interval between the tops of the skin-side protrusions adjacent in the longitudinal direction (Y direction) is 8 mm. It was.
The obtained top sheet is composed of an absorber (0.1 g of superabsorbent polymer dispersed in pulp having a basis weight of 280 gsm and wrapped with tissue paper), a back sheet (polyethylene film having a basis weight of 23 gsm), and a side sheet (basis weight). An amount of 20 gsm spunbond nonwoven fabric) was laminated and fixed. Next, a pair of symmetrical squeezing grooves shown in FIG. 4 was formed. The waveform of the compressed groove was the pattern shown in FIG. The height of the wave at this time was 3 mm. In the drawing-substituting photograph in FIG. 17 (A), the cross section of the outer curved portion 63 of the corrugated compressed groove 6A and a part (pocket portion 12) on the liquid receiving region side of the obtained sample is shown. A one-dot chain line is attached on the substitute photograph in FIG. 17A to help grasp the bending state of the outer bending portion 63. The one-dot chain line indicates the curved portion of the edge of the bottom of the compressed groove 6A. That is, the outer curved portion 63 is curved to the right side, and the left side of the outer curved portion 63 is a portion that is the pocket portion 12 of the topsheet 1. As shown in the photograph of FIG. 17 (A), the pocket portion 12 was an edge of the compressed groove 6A, and the topsheet 1 had the hollow portion 21K firmly left and a bulky structure with both sides uneven.

(Comparative Example 1)
The same topsheet, absorber, backsheet and sidesheet as in Example 1 were laminated and fixed to form a linear compressed groove having no corrugation. As can be seen from FIG. 17B, the surface sheet at the edge of the compressed groove was crushed, and the irregularities were crushed more than those in Example 1.

(Test method)
1. Liquid residue test of surface sheet around pressing groove 2.0 g of defibrinated horse blood was poured into a 35 mm range along the pressing groove in a non-pressurized state on each evaluation sanitary napkin. 60 seconds after pouring defibrinated horse blood, L value in a range of 8 mm in diameter centering on the position of defibrated horse blood was measured. For the measurement, a simple spectral color difference meter NF333 manufactured by Nippon Denshoku Industries Co., Ltd. was used.
The larger the value of L value (brightness) is, the closer the color is to white, and the less redness is visible on the top sheet. That is, the larger the L value, the less liquid remaining on the top sheet.
The defibrinated horse blood used was adjusted to a viscosity of 8.0 ± 0.1 cP (25 ° C.). The viscosity was adjusted by adding plasma and blood cell components extracted from horse blood itself to horse blood. Plasma and blood cell components are a supernatant portion and a sediment portion, respectively, when horse blood is left and separated.

2. Test of leakage prevention by pressing groove A sanitary napkin for each evaluation was expanded in a flat shape, and a top sheet was faced upward, and fixed on a smooth inclined surface having an inclination angle of 45 ° with respect to a horizontal surface in a non-pressurized state. Defibrinated horse blood similar to that described above was injected at a rate of 1 g / 10 seconds from the pressing groove (pressing groove adjacent to the liquid receiving area) on the top sheet to the 10 mm liquid receiving area side. The injection amount (limit injection amount) at the time when the defibrinated horse blood crossed the squeezing groove was measured. It means that the leakage prevention performance by a pressing groove is so high that the measured injection amount is large.
In addition, the drawing substitute photograph of FIG.17 (C) and (D) is an image | photographed state of the pressing groove and injection | pouring periphery at the time of injection | pouring 6g in total by continuing injection | pouring.

  As Table 1 shows, Example 1 has an L value that is improved by about 13% compared to Comparative Example 1, and in the periphery of the compressed groove, the liquid permeability of the surface sheet and the resulting liquid residue prevention. It was excellent. Further, in Example 1, the limit injection amount was improved by about 50% as compared with Comparative Example 1, and the liquid permeability of the surface sheet at the edge of the compressed groove was extremely excellent. As can be seen from the comparison between FIGS. 17A and 17B, the surface sheet of Example 1 is larger in the hollow portion around the compressed groove than the surface sheet of Comparative Example 1, and has unevenness. This is probably due to the presence of a clear, bulky structure. That is, due to the wave shape of the compressed groove, the bulky structure of the surface sheet around the compressed groove continues, and more liquid is guided to the absorber by the liquid permeability by the bulky structure, and the liquid defense function by the compressed groove It seems to have compensated. Moreover, the surface sheet of Example 1 had a soft touch on the skin compared to that of Comparative Example 1 due to the above-described bulky structure.

DESCRIPTION OF SYMBOLS 1, 1A, 1B Topsheet 21 1st protrusion part 22 2nd protrusion part 25 3rd protrusion part 26 4th protrusion part 2 Back surface sheet 3 Absorber 6, 6A, 6B Compression groove (leakproof groove)
61 Groove edge (inner groove edge) on the liquid receiving area side
62 Groove edge on outer edge side (outer groove edge)
63 outer curved portion 64 inner curved portion 65 constricted portion 66 widened portion 67 high pressure portion 68 low pressure portion 69 connecting portion 10 sanitary napkin

Claims (7)

It has a top sheet on the skin contact surface side, a back sheet on the non-skin contact surface side, and an absorber positioned between the top sheet and the back sheet. An absorbent article having a longitudinal direction across the back side and a width direction orthogonal to the longitudinal direction,
The surface sheet has a concave and convex surface without an embossed portion and a hollow portion on the skin side surface and the absorber side surface, and a leak-proof groove partially depressed from the surface sheet to the absorber is the surface sheet. At least one pair on the left and right
The leak-proof groove is a structure having a compacted portion in which the topsheet and the absorber are recessed in an integrated compacted state,
The pair of left and right leakage prevention grooves have a wave shape extending in the longitudinal direction in the plan view of the top sheet, and the shape is bilaterally symmetric about a width direction center line extending in the longitudinal direction. Absorbent article.   The absorbent article according to claim 1, wherein the leak-proof groove has a constriction in the width direction.   The wave height of the portion protruding in the width direction of the wave shape of the leak-proof groove is different between the width direction inner side and the width direction outer side of the absorbent article, and the wave height on the width direction inner side is the width direction. The absorptive article according to claim 1 or 2 higher than the height of an outside wave.   The absorbent article according to any one of claims 1 to 3, wherein a wave height of a portion protruding in the width direction of the leak-proof groove is smaller than the uneven pitch in the width direction of the top sheet.   The absorbent article according to any one of claims 1 to 4, wherein the leak-proof groove includes a high-pressure squeezed portion and a low-pressure squeezed portion, and the high-pressure squeezed portion is disposed separately from each other.   The absorbent article according to claim 5, wherein the high pressure portion is surrounded by the low pressure portion. The pair of left and right leakage prevention grooves are arranged in plurality, and the pair of leakage prevention grooves having the widest separation area between the leakage prevention grooves adjacent in the width direction is in the liquid receiving area. The absorbent article of Claim 1.