WO2019107192A1

WO2019107192A1 - Absorbent article

Info

Publication number: WO2019107192A1
Application number: PCT/JP2018/042536
Authority: WO
Inventors: 友美古川; 耕平桑畑
Original assignee: 花王株式会社
Priority date: 2017-11-29
Filing date: 2018-11-16
Publication date: 2019-06-06
Also published as: RU2748689C1; JP2019097690A; CN111315335B; CN111315335A; JP7157525B2

Abstract

The present invention is a disposable diaper (1) provided with: a liquid-holding absorbent core (40); and a skin-facing fiber structure (10) arranged on the skin-facing surface side of the absorbent core (40). When the disposable diaper (1) is viewed in a plan view from the skin-facing surface side, the skin-facing fiber structure (10) has: a plurality of low-density regions (LR) having a relatively low fiber density; and a high-density region (HR) having a relatively high fiber density, and each of the low-density regions (LR) is surrounded by the high-density region (HR). The skin-facing fiber structure (10) is provided with a surface sheet (2) arranged on the skin-facing surface side.

Description

Absorbent articles

The present invention relates to an absorbent article such as a disposable diaper.

Heretofore, one of the technical problems of absorbent articles has been the improvement of the soft feces absorption performance. Soft stool is an excrement often found particularly in low-aged children, and its viscosity is different and heterogeneous compared to normal stool. Therefore, if the soft feces absorption capability of the diaper is insufficient, the time for which the wearer's skin comes into contact with the soft feces will be long, and the skin may be stimulated to cause skin troubles such as skin inflammation.

As a technique for reducing such contact with feces and preventing skin irritation, Patent Document 1 discloses an absorbent article having a sublayer between a top sheet having a large number of openings and an absorbent core. Have been described. Moreover, the absorbent article which distribute | arranged the intermediate sheet which is synonymous with a sublayer between the surface sheet and the absorber is disclosed by patent document 2 and patent document 3. FIG.

JP 2011-235115 A JP, 2008-100106, A JP, 2011-200443, A

The present invention is an absorbent article comprising a liquid-retaining absorbent core, and a skin-facing fiber structure disposed on the skin-facing surface side of the absorbent core. The absorbent article is planarly viewed from the skin-facing surface side, and the skin-facing fibrous structure has a plurality of low density areas with relatively low fiber density and a high density area with relatively high fiber density. And each low density region is surrounded by the high density region.

FIG. 1 is a plan view schematically showing the skin-facing surface, that is, the front sheet side, of a disposable diaper according to an embodiment of the absorbent article of the present invention. It is a top view in a state. FIG. 2 is a cross-sectional view schematically showing a cross section taken along line II-II of FIG. FIG. 3 is a partially enlarged plan view showing the low density area and the high density area of the disposable diaper of the present embodiment. FIG. 4 is a partially enlarged cross-sectional view in which a part of a cross-sectional view of the disposable diaper of the present embodiment is enlarged. FIG. 5: is the partial expanded sectional view which expanded a part of cross-sectional view of the disposable diaper of other embodiment of this invention (FIG. 4 equivalent view).

Detailed Description of the Invention

Patent Document 1 does not describe anything about the fiber density of the top sheet and the fiber density of the sublayer, and nothing about the relationship between the fiber density of the top sheet and the fiber density of the sublayer.

In addition, Patent Document 2 and Patent Document 3 describe using an intermediate sheet having a fiber density higher than the fiber density of the surface sheet in the absorbent article. In a disposable diaper in which such an intermediate sheet having a high fiber density is lower in fiber density than the intermediate sheet and adjacent to the back surface side of the top sheet having liquid permeation holes, the fiber density of the surface sheet other than the liquid permeation holes There is a concern that soft stools tend to remain on the lower part, and the remaining soft stools may irritate the wearer's skin and cause skin problems such as skin irritation.

Therefore, the present invention relates to an absorbent article which absorbs inhomogeneous soft stools of different viscosities efficiently and the soft stools are less likely to adhere to the skin of the wearer.

Hereinafter, the absorbent article of the present invention will be described based on its preferred embodiments with reference to the drawings. The disposable diaper 1 which is one Embodiment of the absorbent article of this invention is shown by FIG.1 and FIG.2. The diaper 1 has a ventral side 1F disposed on the ventral side of the wearer when worn, a dorsal side 1R disposed on the dorsal side, and a crotch 1M located therebetween, and crotch from the ventral side 1F It has a longitudinal direction X which extends to the back side 1R via the portion 1M and which corresponds to the longitudinal direction of the wearer, and a transverse direction Y which is orthogonal to this. As described above, the front-rear direction of the wearer is a direction extending from the ventral side 1F to the dorsal side 1R via the crotch 1M. The crotch portion 1M is in the range of 25 to 60%, preferably 30 to 50% of the total length of the diaper 1 around the bisector CL when the diaper 1 is equally divided in the longitudinal direction X into two. . Further, the crotch portion 1M has an excretion portion facing portion which is disposed to face both the urine excretion portion and the feces excretion portion (anus) of the wearer when the diaper 1 is worn, and the excretion portion facing portion is usually a diaper It is located at or near the central portion in the longitudinal direction X of 1.

The diaper 1 comprises a liquid-retaining absorbent core 40, a skin-facing fibrous structure 10 disposed on the skin-facing surface side of the absorbent core 40, and an absorbent core 40, as shown in FIGS. It is equipped with a liquid impermeable or liquid impermeable back sheet 3 disposed on the non-skin facing surface side. The skin-facing fibrous structure 10 is disposed on the skin-facing surface side, and is a liquid-permeable surface sheet 2 that can contact the wearer's skin when worn, and a fluid disposed adjacent to the non-skin-facing surface of the surface sheet 2 A permeable intermediate sheet 5 is provided. The skin-facing fiber structure 10 is formed by laminating the surface sheet 2 and the intermediate sheet 5. In the diaper 1, the absorbent core 40 is covered with the core wrap sheet 41 and constitutes the absorbent body 4. The diaper 1 has an elongated hourglass shape in which a substantially central portion in the longitudinal direction X located in the crotch 1M narrows inward and extends in one direction, that is, the longitudinal direction X in plan view as shown in FIG.

In the present specification, the "skin-facing surface" is a surface of the absorbent article or a component thereof (for example, the surface sheet 2) that faces the skin of the wearer when the absorbent article is worn, ie, relatively worn. It is the side close to the skin of the person, and the "non-skin facing side" is the side of the absorbent article or its component that is directed to the side (dressing side) opposite to the skin side when wearing the absorbent article, Far from the wearer's skin. In addition, "at the time of wearing" means the state where the usual proper wearing position, ie, the correct wearing position of the absorptive article, was maintained, and when the absorptive article has shifted from the wearing position. Not included.

The top sheet 2 and the back sheet 3 each have a size larger than that of the absorber 4 and extend outward from the outer edge of the absorber 4. The surface sheet 2 will be described in detail later. The back sheet 3 forms the outline of the diaper 1 in the unfolded and stretched state as shown in FIG. As the back sheet 3, various materials conventionally used for this type of absorbent article can be used without particular limitation. As the back surface sheet 3, for example, a resin film, a laminate of a resin film and a non-woven fabric or the like can be used. The back sheet 3 includes, for example, a form of a liquid-impermeable film sheet alone and a form in which an exterior sheet is laminated on the non-skin facing surface of the film sheet, that is, the outer surface side. It is a non-woven fabric.

The absorber 4 has a long shape in the longitudinal direction X in plan view as shown in FIG. 1 and extends from the ventral side 1F to the dorsal side 1R. The absorbent core 40 and the core wrap sheet 41 are joined by a known joining means such as a hot melt adhesive.

The absorbent core 40 has a single-layer structure, and in a plan view as shown in FIG. 1, has an hourglass shape in which a substantially central portion in the longitudinal direction, that is, the longitudinal direction X is inwardly narrowed. The absorbent core 40 is formed by stacking a core-forming material containing an absorbent material. As the absorbent material, materials generally used as a material for forming this type of absorbent core can be used without particular limitation, and examples thereof include hydrophilic fibers such as wood pulp, synthetic fibers treated with a hydrophilizing agent, and water absorption. Polymer particles. That is, the absorbent core 40 may be a piled body of hydrophilic fibers, or one obtained by supporting the piled water absorbent polymer particles on the piled body. A water-permeable sheet material can be used as the core wrap sheet 41, and for example, paper, non-woven fabric, etc. can be used.

The intermediate sheet 5 is a sheet separate from the absorbent body 4 and interposed between the top sheet 2 and the absorbent body 4 and is also called a sublayer or a second sheet. The intermediate sheet 5 has a rectangular shape in plan view as shown in FIG. Preferably, the intermediate sheet 5 covers 30 to 70% of the skin-facing surface of the absorbent body 4 with the longitudinal direction aligned with the longitudinal direction X, and further covers 40 to 60%. preferable. In the diaper 1, the intermediate sheet 5 is disposed in the crotch 1M. The length (width) of the intermediate sheet 5 in the transverse direction Y is equal to or shorter than that of the absorbent body 4. As described above, the crotch portion 1M includes the discharge portion facing portion, and the intermediate sheet 5 is disposed at the discharge portion facing portion. The intermediate sheet 5 and each of the surface sheet 2 and the absorbent body 4 (core wrap sheet 41) are entirely or partially bonded by a known bonding means such as an adhesive. The intermediate sheet 5 will be described in detail later.

Side sheets 6 are disposed on the left and right sides of the front sheet 2 along the longitudinal direction X, respectively. The side sheet 6 has an inner edge along the longitudinal direction X and an outer edge along the longitudinal direction X located on the outer side of the lateral direction Y than the inner edge, as shown in FIG. In view, the inner edge overlaps the absorber 4, and the outer edge extends outward in the lateral direction Y from the side edge along the longitudinal direction X of the absorber 4, as shown in FIG. It is joined with 3. A thread-like elastic member 60 is fixed in a stretched state along the longitudinal direction X between the side sheets 6 and the back sheet 3 in the left and right leg portions disposed around the legs of the wearer, whereby the diaper A pair of leg gathers are formed on the leg portion when 1 is worn by the contraction of the elastic member 60. In addition, a thread-like elastic member 61 is fixed to the inner edge of the side sheet 6 in a stretched state along the longitudinal direction X, whereby at least the crotch 1M is contracted by the contraction of the elastic member 61 when the diaper 1 is worn. In the side sheet 6, the inner edge side of the side sheet 6 is erected toward the wearer's skin side from the junction with the back sheet 3 to form a leak-barrier cuff. This leak-barrier cuff can prevent so-called lateral leak of the drainage fluid such as urine to the outside in the lateral direction Y. The top sheet 2, the back sheet 3, the absorber 4, the intermediate sheet 5, the side sheets 6, and the

elastic members

60 and 61 are bonded to each other by a known bonding means such as a hot melt adhesive.

The diaper 1 is a so-called spreadable disposable diaper, and as shown in FIG. 1, a pair of

fastening tapes

7 and 7 are provided on both side edges along the longitudinal direction X of the back side 1R of the diaper 1 . A fastening portion (not shown) made of a male member of a mechanical surface fastener is attached to the fastening tape 7. In addition, on the non-skin facing surface of the ventral side portion 1F of the diaper 1, an attachment area 8 made of a female member of a mechanical surface fastener is formed. The attachment region 8 is a non-skin facing surface of the back sheet 3 forming the non-skin facing surface of the flank 1F, with a female member of a mechanical surface fastener by a known bonding means such as an adhesive or heat seal. It is formed by joining and fixing, and the fastening portion of the fastening tape 7 can be detachably fastened.

Next, the surface sheet 2 and the intermediate sheet 5 described above will be described in detail with reference to FIGS. 3 and 4 in addition to FIGS. 1 and 2. FIG. 3 is a partially enlarged plan view showing the low density region LR and the high density region HR of the diaper 1 when the diaper 1 is viewed in plan from the top sheet 2 side. FIG. 4 shows a partially enlarged cross-sectional view in which a part of the cross-sectional view of the diaper 1 is enlarged.

The top sheet 2 has a plurality of openings 2 h penetrating the top sheet 2 as shown in FIGS. 1 and 2. The openings 2 h may be provided in the entire area of the surface sheet 2, but in the diaper 1, the openings 2 h are provided in the crotch 1 M of the surface sheet 2. Thus, since the plurality of openings 2 h are provided in the surface sheet 2, in the diaper 1, as shown in FIGS. 3 and 4, the skin facing surface of the intermediate sheet 5 is exposed from each opening 2 h It has become. As described above, the crotch portion 1M has the excretory part opposing part, and the excretory part opposing part is the fecal excretory part opposing part 2R disposed opposite to the fecal excretory part of the wearer. It has on the back side 1R side. In the diaper 1, as shown in FIG. 1, it is preferable that the plurality of apertures 2h of the top sheet 2 be provided only in the feces excretory part facing part 2R. By providing the opening 2h only in the feces excrement part facing part 2R, excrement such as soft stool can be efficiently collected from the opening 2h, for example, and the collected excrement other than the feces excrement part facing part 2R It is possible to suppress liquid return from the site.

The openings 2 h may be dispersed in the surface direction of the surface sheet 2 as shown in FIG. 1, but in the diaper 1, the plurality of the openings 2 h are uniformly distributed in the in-plane direction of the surface sheet 2 doing. Specifically, a row of apertures in which a plurality of apertures 2 h are arranged in series along the horizontal direction Y at regular intervals is arranged at regular intervals in the longitudinal direction X. And, in the diaper 1, between the

openings

2h and 2h adjacent to each other in the lateral direction Y constituting one opening row, the opening 2h forming another opening row adjacent to the one opening row Are arranged in a staggered arrangement.

The shape of the openings 2h is not particularly limited, but from the viewpoint of preventing the flow of excremented loose feces and the like in the lateral direction Y and preventing leakage, the surface sheet 2 is viewed in plan view from the top Preferably, X is formed in a long shape. For example, it is preferable to form an elliptical shape whose major axis direction coincides with the longitudinal direction X or a rectangular shape whose longitudinal direction coincides with the longitudinal direction X. In the diaper 1, the openings 2h are formed in a rectangular shape long in the longitudinal direction X.

When the surface sheet 2 is planarly viewed, the area ratio of the openings 2h is preferably 5% or more, more preferably 10% or more, and 20% or less, from the viewpoint of improving the absorption performance of excrement such as soft stools. 18% or less is more preferable, and specifically, 5% or more and 20% or less is preferable, and 10% or more and 18% or less is more preferable. The area ratio of the openings 2h is measured by the following method.

[Method of measuring area ratio of opening 2h]
First, a portion surrounded by a square of 7 cm × 7 cm (49 cm ² ) in plan view having openings 2 h from the top sheet 2 is cut out. Next, the area is viewed in plan, and the area of each opening 2h of the area is measured, and the sum of the areas of the openings 2h is determined. Then, the area ratio of the opening is determined by the following equation.

Area ratio of aperture 2 h (%) =
(Sum of area of aperture 2 h / area of the aforementioned portion cut off (49 cm ² )) × 100

From a similar viewpoint, 5 mm ² or more is preferable, and 7 mm ² or more is more preferable, and 20 mm as an area (surface area) per hole 2 h formed in the crotch 1 M in plan view of the surface sheet 2. ² or less is preferable, 15 mm ² or less is more preferable, 5 mm ² or more and 20 mm ² or less is preferable, and 7 mm ² or more and 15 mm ² or less is more preferable.

20 g / m ² or more is preferable, 25 g / m ² or more is more preferable, 36 g / m ² or less is preferable, 32 g / m ² or less is more preferable, and 20 g / m ² or more is 36 g / m ² preferably ² or less, 25 g / m ² or more 32 g / m ² or less is more preferable. The basis weight of the surface sheet 2 is a value measured in a state where the openings 2 h are removed.

The fiber density (book / mm ² ) of the fibers forming the topsheet 2 is higher than the fiber density of the fibers forming the intermediate sheet 5. Specifically, the fiber density of the surface sheet 2, from the viewpoint of absorbing a low viscosity feces efficiently, preferably 100 / mm ² or more, more preferably 150 present / mm ² or more, 300 lines / mm ² or less, more preferably 250 lines / mm ² or less, preferably 100 / mm ² or more 300 lines / mm ² or less, more preferably 150 present / mm ² or more 250 lines / mm ² or less. The fiber density of the fibers of the top sheet 2 is measured by the following measurement method. The fiber density of the top sheet 2 is a value measured without the openings 2 h.

[Method of measuring fiber density]
The cut surface of the surface sheet 2 is adjusted to a magnification (150 to 500 times that can measure about 30 to 60 fiber cross sections) using a scanning electron microscope and then adjusted per fixed area (about 0.5 mm ²⁾ the number of cross sections of the fibers that are cut by the cutting surface of) were measured to determine the area of the field portion of the measurement of the number of fiber cross section. then, in terms of the number of cross sections of fibers per 1 mm ^2, the fiber density this (Book / mm ² ) Measurement is performed at three points and the average is the fiber density of the sample For example, JCM-5100 (trade name) manufactured by JEOL Ltd. is used for the scanning electron microscope It can be used.

Further, as shown in FIGS. 3 and 4, an outer edge portion 2 h 1 having a higher fiber density than that of the portion of the top sheet 2 excluding the openings 2 h is formed at the outer edge of the opening 2 h of the top sheet 2. The fiber density (book / mm ² ) of the fibers forming the outer edge portion 2 h 1 is preferably 300 fibers / mm ² or more, 350 fibers / mm ² from the viewpoint of more efficiently absorbing the soft stool excreted in the surface sheet ^2. The above is more preferable, 500 lines / mm ² or less is preferable, 450 lines / mm ² or less is more preferable, 300 lines / mm ² or more and 500 lines / mm ² or less are preferable, 350 lines / mm ² or more and 450 lines / mm ² The following are more preferable. The fiber density of the fibers of the outer edge portion 2h1 is measured by the same method as the above-described fiber density measurement method.

In the diaper 1, the entire intermediate sheet 5 is made of a non-woven fabric formed of synthetic fibers. Total basis weight of the intermediate sheet 5 is preferably 15 g / m ² or more, 25 g / m ² or more, and preferably from 50g / m ² or less, more preferably ^{40g / m 2, 15g / m} 2 or more 50g / M ² or less is preferable, and 25 g / m ² or more and 40 g / m ² or less are more preferable.

The fiber density of the fibers forming the intermediate sheet 5 is lower than the fiber density of the fibers forming the top sheet 2. In the diaper 1, as shown in FIG. 4, the intermediate sheet 5 is adjacent to the non-skin facing surface of the high density layer 51 having a relatively high fiber density and the high density layer 51 and has a relatively low fiber density. It has a two-layer structure having a density layer 52. The low density layer 52 is located on the surface sheet 2 side (skin facing surface side), and the high density layer 51 is located on the absorber 4 side (non-skin facing surface side). That is, in the intermediate sheet 5, the fiber density of the fibers on the surface sheet 2 side (skin facing surface side) is relatively low, and the fiber density of the fibers on the non-skin facing surface side is relatively high. By relatively increasing the fiber density of the fibers on the absorbent body 4 side (non-skin facing surface side) of the intermediate sheet 5, soft stool can be smoothly drawn into the absorbent body 4 by the capillary force of the fibers.

The difference between the fiber density of the fibers forming the low density layer 52 of the intermediate sheet 5 (book / mm ² ) and the fiber density of the fibers forming the high density layer 51 (book / mm ² ) From the viewpoint of drawing into the absorber 4, etc., it is preferable that it is 5 / mm ² or more, more preferably 10 / mm ² or more, preferably 50 / mm ² or less, 30 It is more preferably 5 mm / mm ² or less, preferably 5 lines / mm ² or more and 50 lines / mm ² or less, and more preferably 10 lines / mm ² or more and 30 lines / mm ² or less. The fiber density of the fibers forming the intermediate sheet 5 is measured by the same method as the method of measuring the fiber density described above.

The fiber density (book / mm ² ) of the fibers forming the high density layer 51 is lower than the fiber density of the fibers forming the topsheet 2. The fiber density of the fibers forming the dense layer 51, from the same viewpoint, preferably 20 present / mm ² or more, more preferably 25 present / mm ² or more, preferably 50 present / mm ² or less, 30 lines / mm ² or less is more preferable, 20 lines / mm ² or more and 50 lines / mm ² or less are preferable, and 25 lines / mm ² or more and 30 lines / mm ² or less are more preferable.

The fiber density (book / mm ² ) of the fibers forming the low density layer 52 is lower than the fiber density of each of the fibers forming the high density layer 51 and the surface sheet 2. The fiber density of the fibers forming the low-density layer 52, from the same viewpoint, preferably three / mm ² or more, more preferably five / mm ² or more, preferably 45 present / mm ² or less, 10 lines / mm ² or less is more preferable, 3 lines / mm ² or more and 45 lines / mm ² or less are preferable, and 5 lines / mm ² or more and 10 lines / mm ² or less are more preferable.

In the diaper 1, the low density region LR and the high density region HR are formed by the surface sheet 2 having the openings 2h having the physical properties as described above and the intermediate sheet 5 lower than the fiber density of the fibers forming the surface sheet 2 It is done. Specifically, when the diaper 1 is planarly viewed from the surface sheet 2 side, the low density region LR is an area from the opening 2 h of the surface sheet 2 in the portion where the surface sheet 2 and the intermediate sheet 5 overlap in the thickness direction. The skin opposing surface of the sheet 5 is exposed and formed. The high density region HR is formed by the portion of the top sheet 2 excluding the openings 2 h in the portion where the top sheet 2 and the intermediate sheet 5 overlap in the thickness direction. The boundary H1 between the low density region LR and the high density region HR is formed by the outer edge portion 2h1 of the opening 2h in the surface sheet 2 at the portion where the surface sheet 2 and the intermediate sheet 5 overlap in the thickness direction. And is formed to be higher than the fiber density of the high density region HR.

Thus, in the diaper 1, the skin-facing fiber structure 10 has a plurality of low density regions LR and a high density region HR, as viewed from above the skin-facing surface, and each low density region LR It is surrounded by a high density area HR. Therefore, even when the excrement excreted by the wearer is heterogeneous soft stool, the low-density region HR holds and absorbs the low-viscosity stool, and the high-density stool is retained and absorbed in the low-density region LR. It can be efficiently absorbed in response to heterogeneous viscosities of different viscosities. As described above, since it is possible to efficiently absorb inhomogeneous soft stools having different viscosities, it is difficult for soft stools to adhere to the wearer's skin, and skin troubles such as skin inflammation can be prevented. Note that “each low density region LR is surrounded by the high density region HR” means not only that the entire circumference of each low density region LR is surrounded by the high density region HR, but also in the low density region LR. As in the case where the outer edge is located at the outer edge of the skin-facing fiber structure 10, the entire periphery of the low density region LR is not surrounded by the high density region HR, and 50% or more of the entire periphery of the low density region LR is high It is a meaning also including the state surrounded by the density region HR.

The shape of the low density region LR is the same as the shape of the opening 2 h of the surface sheet 2 described above because the low density region LR is formed by exposing the intermediate sheet 5 from the opening 2 h of the surface sheet 2. By forming the low density region LR in a longitudinally long rectangular shape, for example, it becomes easy to hold the soft stool in the low density region LR before the low viscosity stool flows in the horizontal direction Y, and from the crotch 1M Liquid leakage can be efficiently suppressed. In particular, by forming the low density region LR into a rectangular shape long in the longitudinal direction X, liquid leakage can be suppressed more efficiently.

Further, since the area per low density region LR is formed by exposing the intermediate sheet 5 from the opening 2 h of the surface sheet 2 in the low density region LR, the area of the opening 2 h of the surface sheet 2 described above is is the same as the area per, from the viewpoint of improving the absorption performance of excrement loose stool, etc., preferably 5 mm ² or more, more preferably 7 mm ² or more, preferably 20 mm ² or less, 18 mm ² or less, more preferably, preferably 5 mm ² or more 20 mm ² or less, more preferably 7 mm ² or more 18 mm ² or less.

In the low density region LR (opening 2h) relative to the surface area of the skin-facing fiber structure 10 (area of the portion where the surface sheet 2 and the intermediate sheet 5 are laminated) formed by laminating the surface sheet 2 and the intermediate sheet 5 The percentage of the total area is preferably 5% or more, more preferably 10% or more, and preferably 20% or less, more preferably 18% or less, from the viewpoint of improving the absorption performance of feces such as soft stools. In particular, 5% or more and 20% or less are preferable, and 10% or more and 18% or less are more preferable. The ratio of the total area of the low density region LR to the surface area of the skin-facing fiber structure 10 is measured by the following method.

[Proportion of the total area of the low density region LR to the surface area of the skin-facing fiber structure 10]
First, a portion surrounded by a square of 7 cm × 7 cm (49 cm ² ) in plan view having a low density region LR is cut out from the top sheet 2. Next, the portion is viewed in plan, the area of each low density region LR included in the portion is measured, and the sum of the areas of the low density region LR is determined. Then, the ratio of the total area of the low density region LR to the surface area of the skin-facing fiber structure 10 is determined by the following equation.

Percentage of total area of the low density region LR (%) =
(Sum of area of low density region LR / area of said portion cut off (49 cm ² )) × 100

Further, as shown in FIG. 1, when the low density region LR is provided in the feces excretory part facing part 2R, the soft feces, urine and the like collected from the high density area HR are liquid from a site other than the feces excretory part facing part 2R. It is possible to suppress returning. Further, when the low density regions LR are arranged in a staggered arrangement, stool with high viscosity can be efficiently held and absorbed.

Further, as shown in FIG. 3, the fiber density at the boundary H1 with the high density area HR surrounding the low density area LR is higher than the fiber density of the high density area HR. Therefore, low viscosity stool easily flows by capillary action from the low density region LR or from the high density region HR to the high fiber density boundary portion H1, and the absorption performance of excrement such as soft stool is improved.

More specifically, the low-density region LR, the high-density region HR, and the boundary H1 relate to the contact angle of the fibers constituting the skin-facing surface with ion exchange water, such as stools with low viscosity to the absorbent 4 side. The contact angle of the high density region HR, which is a portion excluding the openings 2 h in the surface sheet 2, is the same as that in the surface sheet 2 from the viewpoint of improving the retraction and reducing the liquid residue of the excrement on the skin facing surface of the diaper 1. Preferably, the contact angle is lower than the contact angle of the boundary portion H1 which is the outer edge portion 2h1 of the aperture 2h. Then, the contact angle of the low density region LR formed by exposing the intermediate sheet 5 from the opening 2 h of the surface sheet 2 is higher than the contact angle of the high density region HR which is a portion excluding the opening 2 h in the surface sheet 2. Low is preferred. Specifically, the contact angle of the boundary portion H1, in other words, the contact angle of the fibers constituting the skin facing surface side of the outer edge portion 2h1 of the opening 2h in the top sheet 2 is preferably 75 degrees or more, 80 degrees or more More preferably, 95 degrees or less is preferable, 90 degrees or less is more preferable, 75 degrees or more and 95 degrees or less are preferable, and 80 degrees or more and 90 degrees or less are more preferable. Further, the contact angle of the high density region HR, in other words, the contact angle of the fibers constituting the skin facing surface of the portion of the topsheet 2 excluding the openings 2h is preferably 65 degrees or more, more preferably 70 degrees or more, 90 degrees or less is preferable, 80 degrees or less is more preferable, 65 degrees or more and 90 degrees or less are preferable, and 70 degrees or more and 80 degrees or less are more preferable. The contact angle of the low density region LR, in other words, the contact angle of the fibers constituting the skin facing surface side of the intermediate sheet 5 at least in the portion exposed from the opening 2h, is preferably 60 degrees or more, more preferably 65 degrees or more 85 degrees or less is preferable, 75 degrees or less is more preferable, 60 degrees or more and 85 degrees or less are preferable, and 65 degrees or more and 75 degrees or less are more preferable. The contact angle of the boundary portion H1, the contact angle of the high density region HR, and the contact angle of the low density region LR are measured by the following measurement method.

[Method of measuring contact angle of fiber to ion-exchanged water]
The fiber is removed from the predetermined site, and the contact angle of water to the fiber is measured. As a measuring device, an automatic contact angle meter MCA-J manufactured by Kyowa Interface Science Co., Ltd. is used. Distilled water is used to measure the contact angle. The amount of liquid discharged from an inkjet type water droplet discharge part (manufactured by Cluster Technology, pulse injector CTC-25 with a discharge hole diameter of 25 μm) is set to 20 picoliter, and a water droplet is dropped right above the fiber. The state of dropping is recorded on a high-speed recording device connected to a camera installed horizontally. From the viewpoint of later image analysis and image analysis, the recording device is preferably a personal computer in which a high-speed capture device is incorporated. In this measurement, an image is recorded every 17 msec. In the recorded video, the first image in which water droplets have dropped on fibers taken out of the non-woven fabric, attached software FAMAS (the software version is 2.6.2, the analysis method is the droplet method, the analysis method is the θ / 2 method) The image processing algorithm is non-reflection, the image processing image mode is frame, the threshold level is 200, curvature correction is not performed, and image analysis is performed to calculate the angle between the surface of the water droplet and the fiber. And the contact angle. The fiber removed from the topsheet 2 is cut into a fiber length of 1 mm, and the fiber is placed on the sample table of the contact angle meter and kept horizontal. Two different contact angles are measured per fiber. A contact angle of N = 5 pieces is measured to one digit after the decimal point, and a value obtained by averaging ten measured values in total (rounded to the second digit after the decimal point) is defined as the contact angle.

As the surface sheet 2 having the above-mentioned physical properties, for example, non-woven fabric, air-through non-woven fabric, spun-bonded non-woven fabric, melt-blown non-woven fabric manufactured by the card method containing thermally fusible synthetic resin such as polyethylene, polyethylene terephthalate, polypropylene etc. It is possible to use various non-woven fabrics such as spunlace non-woven fabric and needle punched non-woven fabric; As the top sheet 2, it is preferable to use an air through non-woven fabric or a spun-bonded non-woven fabric, from the viewpoint of facilitating the passage of soft stool without damaging the texture of the skin facing surface. Further, as the openings 2 h formed in the surface sheet 2, various methods for forming the openings conventionally used in this type of absorbent article can be used without particular limitation. For example, the openings 2 h may be heated By forming by cutting or pressing for cutting, an outer edge portion 2 h 1 having a relatively high fiber density is formed.

In addition, as the intermediate sheet 5 having the physical properties as described above, for example, an air through non-woven fabric, a heat roll non-woven fabric, a spun bond non-woven fabric, a spun bond (S-bond) containing a heat fusible synthetic resin such as polyethylene, polyethylene terephthalate or polypropylene. Meltblown (M)-Spunbond (S) Nonwovens, SMMS Nonwovens, Resin Bonded Nonwovens, Needle Punched Nonwovens, Spunlace Nonwovens, Airlaid Nonwovens can be used. It is preferable to use an air through non-woven fabric as the intermediate sheet.

As a method of manufacturing the intermediate sheet 5 made of the air-through non-woven fabric as described above, for example, a web is formed by dropping and depositing fibers placed on the air flow on the net. The hot air or high pressure water stream is penetrated from the opposite side to perform web bonding. As a feature of the non-woven fabric manufactured by using the net, any non-woven fabric is in contact with the net at the time of manufacture (disposed on the net) and not in contact with the net surface, and high temperature air or high pressure It has a surface (air surface) opposite to the net surface, to which the water flow is directly applied. In the nonwoven fabric having a net surface and an air surface, the fiber density is higher in the net surface than in the air surface. Then, the temperature of the high-temperature air or the pressure of the high-pressure water stream, the moving speed of the web, and the like are adjusted so that the fiber density of the non-woven fabric obtained and the contact angle on the air surface side become desired values. In this manner, the two-layer intermediate sheet 5 having the high density layer 51 and the low density layer 52 can be manufactured.

As mentioned above, although the absorbent article of this invention was demonstrated based on the preferable embodiment, the absorbent article of this invention can be variously changed, without being restrict | limited to the said embodiment.
For example, as shown in FIGS. 3 and 4, the diaper 1 described above has a boundary portion H1 with a higher fiber density than the high density region HR at the boundary with the high density region HR surrounding the low density region LR. However, like the diaper 1 shown in FIG. 5, it is not necessary to have the boundary portion H1. Heterogeneous soft stool can be efficiently absorbed also by the diaper 1 shown in FIG.

Further, in the diaper 1 shown in FIGS. 1 to 4 and the diaper 1 shown in FIG. 5, the skin-facing fiber structure 10 is configured by laminating two sheets of the top sheet 2 and the middle sheet 5. However, the skin facing fiber structure 10 does not necessarily have to be composed of two sheets of the top sheet 2 and the intermediate sheet 5. For example, it may be composed of one sheet having the low density region LR and the high density region HR.

Further, in the diaper 1 described above, the skin-facing fiber structure 10 includes the surface sheet 2 and the intermediate sheet 5, and the skin-facing surface of the intermediate sheet 5 is exposed from the openings 2h of the surface sheet 2 to form the low density region LR. However, the intermediate sheet 5 may not necessarily be provided. For example, the skin-facing fiber structure 10 does not include the intermediate sheet 5 and includes the surface sheet 2 and the core wrap sheet 41 covering the skin-facing surface of the absorbent core, and the skin-facing surface of the core wrap sheet 41 is the surface sheet The low density region LR may be formed so as to be exposed from the openings 2 h of 2. In this case, as the core wrap sheet 41, it is necessary to use a non-woven fabric formed of synthetic fibers, and to use a non-woven fabric having a fiber density of constituent fibers lower than that of the fibers forming the top sheet 2.

Moreover, although the diaper 1 mentioned above uses the nonwoven fabric of 2 layer structure which has the high density layer 51 and the low density layer 52 as the intermediate sheet 5, it is not necessary to necessarily use the nonwoven fabric of 2 layer structure, for example, a surface sheet A single layer non-woven fabric having a fiber density lower than the fiber density of 2 may be used.

In addition, the absorbent article of the present invention is not limited to the above-mentioned unfolded disposable diaper, but includes a wide range of articles used for absorbing body fluid (urine, soft feces, menstrual blood, etc.) discharged from the human body. Also included are disposable diapers, sanitary napkins, sanitary pants and the like.

Regarding the above-mentioned embodiment, the present invention further discloses the following absorbent article.
<1>
An absorbent article comprising: a liquid-retaining absorbent core; and a skin-facing fiber structure disposed on the skin-facing surface side of the absorbent core, wherein the absorbent article is viewed in plan from the skin-facing surface side. The skin-facing fiber structure has a plurality of low density regions with relatively low fiber density and a high density region with relatively high fiber density, each low density region having the high density. An absorbent article surrounded by a density region.
<2>
Wherein the absorbent article in a plan view from the skin facing side, the area of each of said low-density region is 5 mm ² or more 20 mm ² or less, the absorbent article according to <1>.
<3>
When the absorbent article is planarly viewed from the skin facing surface side, the ratio of the total area of the plurality of low density regions to the surface area of the skin facing fiber structure is 5% or more and 15% or less. The absorbent article as described in <2>.
<4>
The absorbent article has a boundary portion at the boundary between each of the low density regions and the high density region surrounding each of the low density regions when the absorbent article is planarly viewed from the skin facing surface side, and the fiber density of the boundary portion is The absorbent article according to any one of <1> to <3>, which is higher than the fiber density of the high density region.
<5>
With regard to the contact angle of the fibers constituting the skin-facing surface with ion exchange water, the contact angle of the high density region is smaller than the contact angle of the boundary portion, and the contact angle of the low density region is greater than the contact angle of the high density region. The absorbent article according to <4>, which is also small.
<6>
The <1> to <5> has a longitudinal direction corresponding to the longitudinal direction of the wearer and a lateral direction orthogonal to the longitudinal direction, and each of the low density regions is formed in a shape elongated in the longitudinal direction. The absorbent article according to any one of the above.
<7>
The absorbent article according to any one of <1> to <6>, wherein the plurality of low density regions are provided on a feces excrement part opposing part disposed opposite to a feces excrement part of a wearer.
<8>
The skin-facing fibrous structure comprises a surface sheet disposed on the skin-facing surface side, and a liquid-permeable intermediate sheet disposed adjacent to the non-skin-facing surface of the surface sheet, the surface sheet comprising: The high density region is formed by a portion excluding the holes in the surface sheet, and the low density region is a surface facing the skin of the intermediate sheet. The absorbent article according to any one of <1> to <7>, which is formed to be exposed from the hole.
<9>
The absorbent article according to <8>, wherein the fiber density of the fibers on the skin facing surface side of the intermediate sheet is lower than the fiber density of the fibers on the non-skin facing surface side.
<10>
The skin-facing fiber structure comprises a surface sheet disposed on the skin-facing surface, and a core wrap sheet disposed between the surface sheet and the absorbent core to cover the skin-facing surface of the absorbent core. The surface sheet has holes distributed in the surface direction, the high density region is formed by a portion excluding the holes in the surface sheet, and the low density region is the core The absorbent article according to any one of <1> to <7>, wherein the skin-facing surface of the wrap sheet is formed so as to be exposed from the opening.

<11>
A plurality of the openings such that openings forming one opening row are arranged between the openings adjacent in the lateral direction are openings forming another opening row adjacent to the one opening row The absorbent article according to any one of the above <8> to <10>, wherein
<12>
When the surface sheet is planarly viewed, the area ratio of the openings is preferably 5% or more, more preferably 10% or more, and preferably 20% or less, and more preferably 18% or less. The absorbent article as described in any one of <11>.
<13>
It has a ventral side disposed on the ventral side of the wearer when worn, a dorsal side disposed on the dorsal side, and a crotch positioned between them, and the top sheet is seen in plan view, the crotch the area per of the apertures formed (surface area), preferably 5 mm ² or more, more preferably 7 mm ² or more, preferably 20 mm ² or less, more preferably 15 mm ² or less, wherein <8> ~ < The absorbent article as described in any one of 12>.
<14>
20 g / m ² or more is preferable, 25 g / m ² or more is more preferable, 36 g / m ² or less is preferable, and 32 g / m ² or less is more preferable Preferred is the absorbent article according to any one of the above <8> to <13>.
<15>
The fiber density of the topsheet is preferably 100 / mm ² or more, more preferably 150 present / mm ² or more, preferably 300 lines / mm ² or less, more preferably 250 lines / mm ² or less, wherein <8> The absorbent article according to any one of <14>.
<16>
The outer edge portion of the opening of the surface sheet is formed with an outer edge portion having a higher fiber density than the portion of the surface sheet excluding the opening, and the fiber density of the fibers forming the outer edge portion (book / mm ² ) is preferably 300 lines / mm ² or more, more preferably 350 lines / mm ² or more, preferably 500 lines / mm ² or less, more preferably 450 lines / mm ² or less, the above <8> to <15> The absorbent article according to any one of the above.
<17>
The intermediate sheet is composed of a non-woven fabric formed of synthetic fibers, and the total basis weight of the intermediate sheet is preferably 15 g / m ² or more, more preferably 25 g / m ² or more, and 50 g / m ² or less The absorbent article according to any one of the above <8> to <16>, which is preferably 40 g / m ² or less.
<18>
The intermediate sheet has a two-layer structure having a high density layer having a relatively high fiber density, and a low density layer adjacent to the non-skin facing surface of the high density layer and having a relatively low fiber density. The difference between the fiber density of the fibers forming the low density layer of the intermediate sheet (book / mm ² ) and the fiber density of the fibers forming the high density layer (book / mm ² ) is 5 / mm ^The number is preferably ² or more, more preferably 10 / mm ² or more, preferably 20 / mm ² or less, and more preferably 15 / mm ² or less, said <8> The absorbent article according to any one of <17>.
<19>
The fiber density of the fibers forming the high density layer (book / mm ² ) is lower than the fiber density of the fibers forming the surface sheet, and the fiber density of the fibers forming the high density layer is 20 this / mm ² or more, more preferably 25 present / mm ² or more, preferably 35 present / mm ² or less, more preferably 30 lines / mm ² or less, the absorbent article according to <18>.
<20>
The fiber density (book / mm ² ) of the fibers forming the low density layer is lower than the fiber density of each of the fibers forming the high density layer and the surface sheet, and the fibers forming the low density layer fiber density is of, three / mm ² or more, more preferably five / mm ² or more, preferably 15 present / mm ² or less, more preferably ten / mm ² or less, the <18> or <19 The absorbent article as described in>.

<21>
The area per one low density region is the same as the area of each one of said apertures of the topsheet is preferably 5 mm ² or more, more preferably 7 mm ² or more, preferably 20 mm ² or less, 18 mm The absorbent article according to any one of the above <8> to <20>, in which ² or less is more preferable.
<22>
The surface area of the skin-facing fiber structure (the area of the portion where the surface sheet and the intermediate sheet are laminated) formed by laminating the surface sheet and the intermediate sheet 5% or more is preferable, 10% or more is more preferable, and 20% or less is preferable, and the ratio of a total area is an absorbent article as described in said <21> as 18% or less is more preferable.
<23>
The contact angle of the fibers constituting the skin facing surface side of the outer edge portion of the hole in the surface sheet which is the boundary portion between the low density region and the high density region is preferably 82 degrees or more, and 83 degrees or more The absorbent article according to any one of <8> to <22>, which is preferably 87 degrees or less, more preferably 86 degrees or less.
<24>
78 degrees or more are preferable, 79 degrees or more are more preferable, and the contact angle of the fiber which comprises the skin opposing surface side of the part except the said opening in the said surface sheet which is the contact angle of the said high density area | region is 82 degrees or less The absorbent article according to any one of <8> to <23>, which is preferably 81 degrees or less.
<25>
70 degrees or more is preferable, 73 degrees or more is more preferable, 78 degrees or less is preferable, and the contact angle of the fiber which comprises the skin opposing surface side of the said intermediate sheet is preferable in at least the part exposed from the said opening. The absorbent article according to any one of <8> to <24>, which is more preferable.
<26>
It has a ventral side disposed on the ventral side of the wearer when worn, a dorsal side disposed on the dorsal side, and a crotch portion located therebetween, the crotch portion being a part of the wearer's urine when worn And the excretory part opposing part disposed opposite to both feces excretory parts, the excretory part opposing part being the feces excretory part opposing part disposed opposite to the fecal excretory part of the wearer. The absorbent article according to any one of <8> to <25>, wherein the plurality of apertures of the top sheet are preferably provided only in the feces excretory part opposing part.
<27>
The absorbent article according to any one of <8> to <26>, wherein the intermediate sheet has a rectangular shape in plan view.
<28>
The intermediate sheet has a longitudinal direction corresponding to the front-rear direction of the wearer and a transverse direction orthogonal thereto, and the intermediate sheet has the longitudinal direction aligned with the longitudinal direction, and the absorbent core is covered with the core wrap sheet. The absorbent according to any one of <8> to <27>, wherein 30 to 70% of the skin-facing surface of the body is covered, and more preferably 40 to 60% is covered. Goods.

Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited by these examples.

Example 1
The diaper which has the structure similar to the diaper 1 shown in FIG.1 and FIG.2 provided with the skin opposing fiber structure 10 which has the surface sheet 2 shown in FIG.3 and FIG.4 and the intermediate sheet 5 was manufactured. As a surface sheet, a spun bond nonwoven fabric having a basis weight of 26 g / m ² containing a polypropylene resin was used. In addition, as the intermediate sheet, a web containing polyethylene resin loaded on air flow is dropped and deposited on the net, and the web on the net moving at a speed of 80 m / s is opposite to the net side. An air through nonwoven fabric with a basis weight of 35 g / m ² was used, which was produced by penetrating air at 135 ° C. from the side at a wind speed of 1 m / s. The physical properties and the like of the surface sheet and the intermediate sheet are shown in Table 1 below.
The fiber density and the fiber angle to ion exchange water were measured by the same method as the above-described measurement method.

Example 2
Change the physical properties etc. using the spun bond nonwoven fabric which has the boundary part H1 whose contact angle to the fiber density and ion exchange water is higher than the high density area HR at the boundary between the low density area LR and the high density area HR as the surface sheet A diaper with the same configuration as in Example 1 was produced except that the top sheet and the intermediate sheet were used. The physical properties and the like of the surface sheet and the intermediate sheet are shown in Table 1 below.

[Example 3]
A surface sheet in which the spun bond non-woven fabric used in Example 2 is used as a surface sheet, and further, an intermediate sheet in which the fiber density on the skin opposing surface side is lower than the fiber density on the non-skin opposing surface side is used. A diaper of the same configuration as Example 1 was manufactured except that an intermediate sheet was used. As an intermediate sheet, a web is formed by dropping and depositing fibers containing polyethylene resin loaded on a stream onto a net, and the web on the net moving at a speed of 100 m / s is from the opposite side to the net surface side Using the air through non-woven fabric manufactured by penetrating air at 135 ° C. at a wind speed of 1 m / s, the surface on the net side of the manufactured air through non-woven fabric was used on the skin opposing surface side. The physical properties and the like of the surface sheet and the intermediate sheet are shown in Table 1 below.

Comparative Example 1
A diaper of the same configuration as Example 1 was produced except that the top sheet and the middle sheet were used with the same fiber density. The physical properties and the like of the surface sheet and the intermediate sheet are shown in Table 1 below.

[Evaluation of the amount of soft mail WB]
In the diapers of Examples 1 to 3 and Comparative Example 1, the diaper is spread flatly and placed horizontally so that the skin facing surface side (the surface sheet 2 side) faces upward, and the longitudinal direction X center of the diaper For a part (a part corresponding to the feces excrement part facing part 2R in FIG. 1) separated 30 mm backward from the bisector CL which is a pseudo soft stool 5g (viscosity 40 mPa · s) at a flow rate of 6 g / s with a metering pump Immediately after injecting 5 ml (viscosity: 240 mPa · s) at the same point, inject non-permeable 10 × 10 cm resin film at the injection position, and add weight on the resin film. Was placed at the injection position for 1 minute. The pressure of "3 kPa" is assumed to be the pressure (pressure resistance) applied to the back side of the diaper when a low-aged baby wearing a diaper is lying on his back. Also, the pseudo-soft stool used is a suspension prepared by dissolving or dispersing bentonite in water, and adjusting the bentonite concentration to set the viscosity of the pseudo soft stool with high viscosity to 40 mPa · s, and the pseudo-soft stool with low viscosity. The viscosity was 240 mPa · s. After pressure treatment, the weight and the resin film were removed, and the weight of the pseudo-soft stool attached to the film was measured. Three measurement samples were prepared for one diaper to be measured, and the above measurement was carried out for each, and the average value of the measured values was taken as the WB amount of the soft stool of the diaper. The smaller the amount of soft stool WB, the better the soft stool absorbability and the higher the evaluation. The results are shown in Table 1.

As shown in Table 1, when the soft stool WB amount (g) of the diapers of Examples 1 to 3 and the soft stool WB amount (g) of the diaper of Comparative Example 1 are compared, the disposable diapers of Examples 1 to 3 are compared Compared with the disposable diaper of Example 1, it turned out that the amount of loose stools WB is low. From this, compared with the disposable diaper of Comparative Example 1, the disposable diapers of Examples 1 to 3 can efficiently absorb inhomogeneous soft stools having different viscosities, and can reduce the occurrence of skin troubles of the wearer. Can be expected.

According to the absorbent article of the present invention, non-uniform soft stools having different viscosities are efficiently absorbed to make it difficult for the soft stools to adhere to the skin of the wearer.

Claims

An absorbent article comprising: a liquid-retaining absorbent core; and a skin-facing fibrous structure disposed on the skin-facing surface side of the absorbent core,
The absorbent article is planarly viewed from the skin-facing surface side, and the skin-facing fibrous structure has a plurality of low density areas with relatively low fiber density and a high density area with relatively high fiber density. An absorbent article, each low density region being surrounded by the high density region.
The absorbent article according to claim 1, wherein the area of each of the low density regions is 5 mm 2 or more and 20 mm 2 or less when the absorbent article is planarly viewed from the skin facing surface side.
The ratio of the total area of the plurality of low density regions to the surface area of the skin-facing fiber structure is 5% or more and 15% or less when the absorbent article is planarly viewed from the skin-facing surface side. The absorbent article as described in.
The absorbent article has a boundary portion at the boundary between each of the low density regions and the high density region surrounding the low density regions, as viewed in plan from the skin facing surface side,
The absorbent article according to any one of claims 1 to 3, wherein the fiber density of the boundary portion is higher than the fiber density of the high density region.
Regarding the contact angle of the fibers constituting the skin facing surface to ion exchange water,
The absorbent article according to claim 4, wherein the contact angle of the high density region is smaller than the contact angle of the boundary portion, and the contact angle of the low density region is smaller than the contact angle of the high density region.
It has a longitudinal direction corresponding to the longitudinal direction of the wearer and a lateral direction orthogonal to the longitudinal direction,
The absorbent article according to any one of claims 1 to 5, wherein each of the low density regions is formed in a shape elongated in the longitudinal direction.
The absorbent article according to any one of claims 1 to 6, wherein the plurality of low density regions are provided in a feces excrement part opposing part disposed opposite to a feces excrement part of a wearer.
The skin-facing fiber structure includes a surface sheet disposed on the skin-facing surface side, and a liquid-permeable intermediate sheet disposed adjacent to the non-skin-facing surface of the surface sheet.
The surface sheet has holes distributed in the surface direction,
The absorbent article according to any one of claims 1 to 7, wherein the low density region is formed such that the skin facing surface of the intermediate sheet is exposed from the hole.
The absorbent article according to claim 8, wherein the fiber density of the fibers on the skin facing surface side of the intermediate sheet is lower than the fiber density of the fibers on the non-skin facing surface side.
The skin-facing fiber structure comprises a surface sheet disposed on the skin-facing surface, and a core wrap sheet disposed between the surface sheet and the absorbent core to cover the skin-facing surface of the absorbent core. ,
The surface sheet has holes distributed in the surface direction,
The high density region is formed by a portion of the surface sheet excluding the opening, and the low density region is formed by exposing the skin facing surface of the core wrap sheet from the opening. The absorbent article according to any one of 9.
A plurality of the openings such that openings forming one opening row are arranged between the openings adjacent in the lateral direction are openings forming another opening row adjacent to the one opening row The absorbent article according to any one of claims 8 to 10, wherein are arranged in a staggered arrangement.
The absorbent article according to any one of claims 8 to 11, wherein the area ratio of the openings is 5% or more and 20% or less in plan view of the surface sheet.
It has a ventral side that is placed on the ventral side of the wearer when worn, a dorsal side that is placed on the dorsal side, and a crotch located between them,
The absorption according to any one of claims 8 to 12, wherein an area per one of the holes formed in the crotch is 5 mm 2 or more and 20 mm 2 or less in plan view of the surface sheet. Sex goods.
The absorbent article according to any one of claims 8 to 13, wherein a basis weight of the surface sheet measured in a state where the pores are removed is 20 g / m 2 or more and 36 g / m 2 or less.
The absorbent article according to any one of claims 8 to 14, wherein the fiber density of the surface sheet is 100 lines / mm 2 or more and 300 lines / mm 2 or less.
The outer edge portion of the opening of the surface sheet is formed with an outer edge portion higher in fiber density than the portion excluding the opening in the surface sheet, and the fiber density of the fibers forming the outer edge portion is 300 The absorbent article according to any one of claims 8 to 15, having a size of 2 mm / mm 2 or more and 500 lines / mm 2 or less.
The skin-facing fibrous structure comprises a liquid-permeable intermediate sheet disposed adjacent to the non-skin-facing surface of the topsheet,
The intermediate sheet is made of non-woven fabric made of synthetic fibers,
The absorbent article according to any one of claims 8 to 16, wherein the overall basis weight of the intermediate sheet is 15 g / m 2 or more and 50 g / m 2 or less.
The skin-facing fibrous structure comprises a liquid-permeable intermediate sheet disposed adjacent to the non-skin-facing surface of the topsheet,
The intermediate sheet has a two-layer structure having a high density layer having a relatively high fiber density, and a low density layer adjacent to the non-skin facing surface of the high density layer and having a relatively low fiber density. ,
The difference between the fiber density of the fibers forming the low density layer of the intermediate sheet and the fiber density of the fibers forming the high density layer is 5 lines / mm 2 or more and 20 lines / mm 2 or less. The absorbent article according to any one of 8 to 17.
The fiber density of the fibers forming the high density layer is lower than the fiber density of the fibers forming the surface sheet,
The absorbent article according to claim 18, wherein a fiber density of fibers forming the high density layer is 20 / mm 2 or more and 35 / mm 2 or less.
The fiber density of the fibers forming the low density layer is lower than the fiber density of each of the fibers forming the high density layer and the surface sheet,
The fiber density of the fibers forming the low-density layer is three / mm 2 15 or more / mm 2 or less, the absorbent article according to claim 18 or 19.
The area per one of the low density regions is the same as the area per one of the holes of the surface sheet, and is 5 mm 2 or more and 20 mm 2 or less. The absorbent article as described.
The skin-facing fibrous structure comprises a liquid-permeable intermediate sheet disposed adjacent to the non-skin-facing surface of the topsheet,
The ratio of the total area of the plurality of low density regions to the surface area of the skin-facing fiber structure formed by laminating the surface sheet and the intermediate sheet is 5% or more and 20% or less. Absorbent articles.
The contact angle of fibers constituting the skin facing surface side of the outer edge portion of the opening in the surface sheet, which is a boundary portion between the low density region and the high density region, is 82 degrees or more and 87 degrees or less. The absorbent article according to any one of 8 to 22.
The contact angle of the fiber which comprises the skin opposing surface side of the part except the said opening in the said surface sheet which is a contact angle of the said high density area | region is 78 degrees or more and 82 degrees or less. The absorbent article according to item 1.
The skin-facing fibrous structure comprises a liquid-permeable intermediate sheet disposed adjacent to the non-skin-facing surface of the topsheet,
The absorption angle according to any one of claims 8 to 24, wherein the contact angle of the fibers constituting the skin-facing surface side of the intermediate sheet is at least 70 degrees and not more than 78 degrees at least in the portions exposed from the openings. Sex goods.
It has a ventral side disposed on the ventral side of the wearer when worn, a dorsal side disposed on the dorsal side, and a crotch portion located therebetween, the crotch portion being a part of the wearer's urine when worn And the feces excrement part is disposed opposite to the feces excrement part,
The excretory part opposing part has a feces excretory part opposing part disposed opposite to the feces excretory part of the wearer on the back side.
The absorbent article according to any one of claims 8 to 25, wherein the plurality of apertures of the surface sheet are provided only in the stool excretory part facing portion.
The skin-facing fibrous structure comprises a liquid-permeable intermediate sheet disposed adjacent to the non-skin-facing surface of the topsheet,
The absorbent article according to any one of claims 8 to 26, wherein the intermediate sheet has a rectangular shape in plan view.
It has a longitudinal direction corresponding to the longitudinal direction of the wearer and a lateral direction orthogonal to the longitudinal direction,
The skin-facing fiber structure includes the surface sheet, a core wrap sheet disposed between the surface sheet and the absorbent core to cover the skin-facing surface of the absorbent core, and the non-skin-facing surface of the surface sheet. A liquid-permeable intermediate sheet disposed adjacent to the
28. The intermediate sheet according to claim 8, wherein the intermediate sheet is aligned in the longitudinal direction so as to cover 30 to 70% of the skin-facing surface of the absorbent body having the absorbent core covered with the core wrap sheet. The absorbent article according to any one of the above.