JP3244295U - sanitary absorbent articles - Google Patents

Abstract

The present invention relates to an absorbent article for sanitary use that includes a top sheet mainly made of water-absorbing fibers and that can suppress concerns about menstrual blood leakage. SOLUTION: In a sanitary absorbent article, a topsheet mainly contains water-absorbing fibers. The absorbent body 4 has a laminated structure including a plurality of absorbent sheets 40, and has a first laminated portion 11 located in the lateral center of the intermediate region B, and a laminated layer of absorbent sheets than the first laminated portion. It has a second laminated part 12 which is small in number and located around the first laminated part, a first slit row L1, and a second slit row L2. At least a portion of the first slit row is arranged in the first stacked section. The second slit row is arranged in the second laminated section. In the first slit row and the second slit row that are adjacent to each other in the horizontal direction, at least one second slit in the second slit row is arranged to face the interval between the first slits in the first slit row in the horizontal direction. be done. [Selection diagram] Figure 3

Description

The present invention relates to sanitary absorbent articles such as sanitary napkins.

Absorbent articles generally include an absorbent body that absorbs excreted liquid, a top sheet placed on the skin side of the absorbent body, and a back sheet placed on the non-skin side of the absorbent body. As the top sheet, one using a cotton nonwoven fabric is known from the viewpoint of achieving high water absorption and moisture absorption and giving the wearer a sense of security due to natural fibers. For example, Patent Document 1 discloses an absorbent article that includes a topsheet having a first topsheet containing cotton fibers and a second topsheet containing heat-fusible fibers, and an absorbent core. .

Patent No. 6685992

On the other hand, in a top sheet made mainly of water-absorbing fibers such as cotton fibers, when excreted liquid such as menstrual blood is excreted, the menstrual blood tends to spread within the surface of the top sheet. For this reason, when brightly colored menstrual blood spreads within the surface of the topsheet, the wearer who sees this may be concerned about fluid leakage. For this reason, there is a need for an absorbent article for sanitary use that can suppress concerns about menstrual blood leakage, even though it includes a top sheet made mainly of water-absorbing fibers.

An object of the present invention is to relate to an absorbent article for sanitary use that is equipped with a top sheet mainly composed of water-absorbing fibers and is capable of suppressing concerns about menstrual blood leakage.

A sanitary absorbent article according to one embodiment of the present invention includes an absorbent body, a top sheet disposed on the skin side of the absorbent body, and a back sheet disposed on the non-skin side of the absorbent body, A sanitary absorbent having a vertical direction corresponding to the front-back direction of the wearer, a horizontal direction perpendicular to the vertical direction and corresponding to the left-right direction of the wearer, and a thickness direction perpendicular to the vertical direction and the horizontal direction. It is a sexual article.
The sanitary absorbent article includes:
In the longitudinal direction, the wearer is divided into an intermediate region including a portion facing the wearer's excretory region, a front region located in front of the intermediate region, and a rear region located behind the intermediate region.
The top sheet mainly contains water-absorbing fibers.
The absorbent body has a laminated structure including a plurality of absorbent sheets, and
a first laminated portion located at the lateral center of the intermediate region;
a second laminated part having a smaller number of laminated absorbent sheets than the first laminated part and located around the first laminated part in the vertical direction and the horizontal direction;
a first slit row including a plurality of first slits arranged at intervals along the longitudinal direction;
a second slit row including a plurality of second slits arranged at intervals along the longitudinal direction.
At least a portion of the first slit row is disposed in the first stacked section.
The second slit row is arranged in the second laminated portion on the laterally outer side of the first slit row.
In the first slit row and the second slit row that are adjacent to each other in the horizontal direction, at least one second slit in the second slit row has a space between the first slits in the first slit row and the second slit row. They are arranged to face each other in the horizontal direction.

According to the sanitary absorbent article of the present invention, it is provided with a top sheet mainly made of water-absorbing fibers, and it is possible to suppress concerns about menstrual blood leakage.

FIG. 1 is a plan view of a sanitary absorbent article according to an embodiment of the present invention. 2 is a sectional view of the sanitary absorbent article taken along line II-II in FIG. 1. FIG. It is a top view of the absorber of the said sanitary absorbent article.

Embodiments of the present invention will be described below with reference to the drawings.

[Overall composition of napkin (absorbent sanitary article)]
A sanitary absorbent article 1 according to an embodiment of the present invention is configured as a sanitary napkin, and is hereinafter referred to as a napkin 1. The napkin 1 includes a main body M and a pair of wing parts W, as shown in FIG. The napkin 1 has a vertical direction X that corresponds to the front-back direction of the wearer and a horizontal direction Y that corresponds to the left-right direction of the wearer and is orthogonal to the vertical direction X. Furthermore, the napkin 1 has a thickness direction Z that is orthogonal to both the longitudinal direction X and the lateral direction Y. For example, the napkin 1 may be configured to be line symmetrical (left-right symmetrical) with respect to a vertical center line CL that bisects the napkin 1 in the horizontal direction Y.

In this specification, "the inside in the lateral direction Y" means the side approaching the vertical center line CL. "Outside in the lateral direction Y" means the side moving away from the vertical center line CL. In this specification, "vertical direction X front" means the front in the longitudinal direction X, that is, the direction toward the ventral side of the wearer. "Vertical direction X rear" means the rear in the vertical direction X, that is, the direction toward the back of the wearer. In this specification, the skin side in the thickness direction Z means the side that is placed on the wearer's side when the napkin 1 is worn. The non-skin side in the thickness direction Z means the side that is placed on the clothing side when the napkin 1 is worn. In this specification, "planar view" means a planar view viewed from the thickness direction Z.

As shown in FIG. 1, the napkin 1 has, in the longitudinal direction It is divided into a front area A, which is located in the middle area, and a rear area C, which is located behind the intermediate area B. In this embodiment, the excretory part is the vaginal opening. In FIG. 1, the intermediate region B is the region between the front and rear base end portions of the wing portion W. The front region A is a region located in front of the intermediate region B (on the ventral side of the wearer). The rear region C is a region located behind the intermediate region B (on the back side of the wearer).

The wing portion W extends outward in the lateral direction Y from the main body M in the intermediate region B. The wing portion W is used by being folded back to the non-skin facing side of the crotch portion of underwear such as shorts.

As shown in FIG. 2, the napkin 1 includes a main body M including an absorbent core 4, a top sheet 2, a back sheet 3, and a sublayer sheet 5. In the example shown in FIG. 2, the napkin 1 has a structure in which a back sheet 3, an absorbent core 4, a sublayer sheet 5, and a top sheet 2 are laminated in this order in the thickness direction Z. These members are appropriately joined by, for example, compressed grooves, adhesives, heat seals, etc., which will be described later.

The absorbent body 4 absorbs and retains body fluids such as menstrual blood from the skin side. In this embodiment, the absorbent body 4 has a laminated structure of absorbent sheets 40. The detailed structure of the absorber 4 will be described later.

The top sheet 2 is arranged on the skin side of the absorbent body 4. The top sheet 2 is a liquid-permeable sheet material, and as described later, mainly contains water-absorbing fibers.

The sublayer sheet 5 is arranged between the topsheet 2 and the absorbent core 4. The sublayer sheet 5 is arranged from the viewpoint of improving the permeability of liquid from the topsheet 2 to the absorbent body 4 and preventing the liquid absorbed by the absorbent body 4 from returning to the topsheet 2. The detailed configuration of the sublayer sheet 5 will be described later. Note that the napkin 1 does not need to have the sublayer sheet 5.

The back sheet 3 is arranged on the non-skin side of the absorbent body 4. From the viewpoint of suppressing leakage of menstrual blood, the back sheet 3 is preferably composed of a sheet material having functions such as liquid impermeability and/or water repellency. Examples of such sheet materials include thermoplastic resin films, laminated sheets of the films and nonwoven fabrics, and the like. Further, the back sheet 3 preferably has air permeability and/or moisture permeability from the viewpoint of improving wearing comfort.

The non-skin side surface 3a of the back sheet 3 is provided with, for example, a main body fixing part 6a and wing fixing parts 6b for fixing the napkin 1 to underwear. The main body fixing part 6a is arranged on the back sheet 3 of the main body M. The wing fixing portion 6b is arranged on the back sheet 3 of the wing portion W. The main body fixing part 6a and the wing fixing part 6b may be made of, for example, an adhesive, a pressure sensitive adhesive, a hook material, or the like.

In the example shown in FIGS. 1 and 2, it is preferable that the napkin 1 further includes a pair of side sheets 7 from the viewpoint of improving the leak-proofing properties of the side portions in the lateral direction Y. The pair of side sheets 7 are arranged on the outer side of the top sheet 2 in the lateral direction Y. As the material for the side sheet 7, a sheet material having a lower hydrophilicity than the top sheet 2 is preferable, and specifically, a nonwoven fabric, a film, a laminated sheet of a nonwoven fabric and a film, etc. having a lower hydrophilicity than the top sheet 2 are preferable. Can be mentioned. The side sheet 7 and the back sheet 3 are joined to each other at the extending portions from both side edges along the longitudinal direction X of the absorber 4 by a known joining means such as adhesive, heat sealing, ultrasonic sealing, or the like. Note that the wing portion W is configured by joining the side sheet 7 and the back sheet 3.

As shown in FIGS. 1 and 2, in this embodiment, the pair of side sheets 7 are joined to the top sheet 2 by a linear first joining line 8a and a second joining line 8b extending along the longitudinal direction X. ing. The first joining line 8a is arranged in the intermediate region B, and is configured as a curved line that extends along the vertical direction X and is convex outward in the horizontal direction Y, for example. The second joining line 8b is arranged in front and behind the first joining line 8a in the vertical direction X, and has, for example, a shape (zigzag shape) that extends along the vertical direction X as a whole and meanders in the horizontal direction Y. Ru. By joining the side sheet 7 to the top sheet 2 by the first joining line 8a and the second joining line 8b, the top sheet 2 and the side sheet A pocket-like space constituted by 7 is formed. Thereby, even when menstrual blood flows outward in the lateral direction Y on the top sheet 2, the space can accommodate the menstrual blood, and leakage of menstrual blood outward in the lateral direction Y can be suppressed.

In the example shown in FIGS. 1 and 2, it is preferable that the napkin 1 further includes a main body compression groove 9a compressed from the topsheet 2 in the thickness direction Z. The main body pressing groove 9a is a linear groove formed on the periphery of the topsheet 2, and is formed by pressing the topsheet 2 in the thickness direction Z. As a result, as shown in FIG. 2, the main body pressing groove 9a has a structure in which the top sheet 2 and the absorbent body 4 are integrally recessed toward the back sheet 3 side. Note that the shape of the main body pressing groove 9a is arbitrary. Further, the napkin 1 may include auxiliary compression grooves 9b arranged in the front region A and the rear region C in addition to the main body compression groove 9a. Note that the napkin 1 does not need to be provided with any of the compression grooves.

[Detailed configuration of top sheet]
The topsheet 2 mainly contains water-absorbing fibers from the viewpoint of achieving high water absorption and hygroscopicity. Since the topsheet 2 mainly contains water-absorbing fibers, the topsheet 2 can quickly absorb excreted liquid and sweat of the wearer. Furthermore, such a top sheet 2 can also absorb water vapor derived from the liquid or sweat and release the water vapor to an unused portion of the absorbent body 4 (ie, a portion capable of absorbing excreted liquid). This effectively suppresses stuffiness when wearing the napkin 1 (absorbent article), improves the feeling of wearing it, and also suppresses skin problems for the wearer.

"The topsheet 2 mainly contains water-absorbing fibers" means that the topsheet 2 contains 50% by mass or more of water-absorbing fibers. The topsheet 2 preferably contains water-absorbing fibers in an amount of 75% by mass or more, more preferably 90% by mass or more, and may be composed only of water-absorbing fibers.

As used herein, "water-absorbing fibers" refer to fibers that have water-absorbing properties, that is, the ability to suck up water, and the water-absorbing fibers can retain the water that has been sucked up. More specifically, the fiber has an official moisture content (moisture content of the fiber in an environment of 20° C. and 65% humidity) of 5% by mass or more. The water-absorbing fibers may be fibers that inherently have water-absorbing properties, or may be fibers that are processed to have water-absorbing properties on fibers that do not originally have water-absorbing properties.

In this embodiment, the water absorbent fibers may be natural fibers or synthetic fibers, such as natural fibers such as cotton fibers, cellulose fibers other than cotton fibers (hemp, coconut, craft pulp, straw), rayon fibers, polynosic fibers, Examples include recycled fibers and semi-synthetic fibers such as acetate rayon. From the viewpoint of giving consumers a sense of security, the water-absorbing fibers are preferably natural fibers, and as will be described in detail later, are more preferably cotton fibers.

The topsheet 2 is composed of a woven fabric or a nonwoven fabric mainly composed of water-absorbing fibers, and is particularly preferably composed of a nonwoven fabric. Examples of such nonwoven fabrics include spunlace nonwoven fabrics, resin bond nonwoven fabrics, needle-punched nonwoven fabrics, etc. from the viewpoint of entangling or adhering water absorbent fibers. Non-woven fabrics are preferred.

In the top sheet 2 mainly composed of water-absorbing fibers, the fibers are less likely to be thermally fused, so that fusion points between the fibers are less likely to be formed, resulting in a soft texture. On the other hand, since the topsheet 2 has high water absorption, menstrual blood is likely to be diffused even within the surface of the topsheet 2. Therefore, in order to suppress excessive diffusion of menstrual blood, a configuration that promotes the transfer of menstrual blood from the top sheet 2 to the absorbent body 4 in the thickness direction Z is preferable. The detailed configuration of the absorbent body 4 will be described below.

[Detailed structure of absorber]
As shown in FIG. 2, the absorbent body 4 has a laminated structure including a plurality of absorbent sheets 40 from the viewpoint of reducing the thickness while ensuring absorbency. The absorbent sheet 40 is configured as a sheet material in which a superabsorbent polymer material is sandwiched and fixed between two sheet-like fiber layers made of hydrophilic fibers. It is preferable that all of the absorbent sheets 40 constituting the absorbent body 4 contain a water-absorbing polymer, but some of them may contain an absorbent sheet that does not contain a water-absorbing polymer.

In forming the absorbent sheet 40, the superabsorbent polymer can be integrated using the adhesive force developed by wetting or a binder such as an adhesive or adhesive fibers added separately. The absorbent sheet 40 is made by depositing an absorbent sheet manufactured by the method described in JP-A-8-246395, pulverized pulp supplied in an air stream, and a water-absorbing polymer, followed by an adhesive (for example, acetic acid). Dry sheet hardened with vinyl adhesive, PVA, etc.), Absorbent sheet obtained by applying hot melt adhesive etc. between paper or nonwoven fabric and then sprinkling super absorbent polymer, Spunbond or melt blown nonwoven fabric An absorbent sheet etc. obtained by blending a super absorbent polymer during the manufacturing process can be used. Examples of water-absorbing polymers include sodium polyacrylate, (acrylic acid-vinyl alcohol) copolymer, sodium polyacrylate crosslinked product, (starch-acrylic acid) graft copolymer, and (isobutylene-maleic anhydride) copolymer. Examples include polymers and saponified products thereof, polyaspartic acid, and the like.

Examples of the hydrophilic fibers constituting the absorbent sheet 40 include those obtained by hydrophilizing hydrophobic fibers and those that are themselves hydrophilic. In particular, those that are hydrophilic and have water-retaining properties themselves are preferred. Preferred examples of the latter hydrophilic fibers include natural fibers, regenerated cellulose fibers, and semi-synthetic fibers. As the hydrophilic fiber, pulp and rayon are particularly preferable, and pulp is more preferable. Further, crosslinked cellulose fibers obtained by crosslinking cellulose fibers within and/or intermolecularly, or cellulose fibers obtained by mercerizing wood pulp may also be used. Examples of the pulp include, but are not limited to, wood pulp such as softwood kraft pulp or hardwood kraft pulp, and natural cellulose fibers such as cotton pulp and straw pulp. These pulps can be used alone or in combination of two or more.

The absorbent body 4 has a first laminated part 11 located at the center in the horizontal direction Y of the intermediate region B, and a lower number of laminated absorbent sheets 40 than the first laminated part 11, and a vertical part of the first laminated part 11. It has a second laminated portion 12 located around the periphery in the direction X and the lateral direction Y. By making the first laminated part 11 a region where the number of laminated absorbent sheets 40 is large, the first laminated part 11 functions as a so-called middle part, and the absorption capacity of the area facing the excretion part of the absorbent body 4 is efficiently increased. can be done.

In this embodiment, the plurality of absorbent sheets 40 preferably include one or more main absorbent sheets 41 and one or more central absorbent sheets 42. The main body absorbent sheet 41 is arranged across the first laminated portion 11 and the second laminated portion 12 . The main body absorbent sheet 41 may be configured to have the same outer shape as the outer shape of the absorbent body 4, for example, or may be folded to have the same outer shape. The central absorbent sheet 42 is arranged only in the first laminated portion 11. The central absorbent sheet 42 may have the same external shape as the first laminated portion 11, for example, or may be folded into the same shape. With this configuration, the number of layers in the first laminated portion 11 can be increased by the number of central absorbent sheets 42. The central absorbent sheet 42 may be placed between the folded body absorbent sheets 41 as shown in FIG. 2, or may be placed on the skin side or the non-skin side of the body absorbent sheet 41. good. A particularly preferable layered structure of the absorber 4 in this embodiment will be described later.

Furthermore, as shown in FIGS. 2 and 3, the absorbent body 4 has a plurality of slits from the viewpoint of promoting migration of menstrual blood in the thickness direction Z. Specifically, the absorber 4 includes a first slit row L1 including a plurality of first slits 13 and a second slit row L2 including a plurality of second slits 14. At least a portion of the first slit row L1 is arranged in the first laminated portion 11. That is, the slit row that includes slits that at least partially overlap the first laminated portion 11 is the first slit row L1. The second slit row L2 is arranged in the second laminated portion 12 on the outer side in the lateral direction Y of the first slit row L1. That is, the first slit row L1 is arranged on the center side of the absorbent body 4 in the lateral direction Y, and the second slit row L2 is arranged on the side part of the absorbent body 4 in the lateral direction Y.

The absorber 4 has one or more first slit rows L1 and one or more second slit rows L2. From the viewpoint of further promoting the migration of menstrual blood in the thickness direction Z, it is preferable that the absorbent body 4 has a plurality of first slit rows L1 and a plurality of second slit rows L2. In the example shown in FIG. 3, the absorber 4 preferably has five first slit rows L1 and a pair (two) of second slit rows L2 arranged on both sides of the first slit rows L1 in the lateral direction Y.

In the first slit row L1, the plurality of first slits 13 are arranged at intervals along the longitudinal direction X. In the first slit row L1, it is sufficient that at least some of the first slits 13 are arranged in the first laminated part 11, and the first slits extend forward and/or backward in the longitudinal direction X of the first laminated part 11. 13 may be present. In the second slit row L2, the plurality of second slits 14 are arranged at intervals along the longitudinal direction X. It is preferable that the slits 13 and 14 belonging to each slit row L1 and L2 are aligned along the longitudinal direction X.

Moreover, in each slit row L1, L2, the interval between the slits 13, 13 adjacent to each other in the longitudinal direction X and the interval between the slits 14, 14 may be different, but are preferably substantially the same. Here, the term "substantially the same" as used herein includes cases where the spaces are completely the same and cases where the difference in length between the spaces is 5% or less. In this embodiment, a portion between adjacent first slits 13 in the longitudinal direction X in the first slit row L1 is referred to as an interval portion 15. Similarly, the portion between the second slits 14 adjacent to each other in the longitudinal direction X in the second slit row L2 is referred to as an interval portion 16.

Furthermore, it is preferable that the first slit 13 and the second slit 14 are configured to extend along the vertical direction X. The expression that the first slit 13 and the second slit 14 "extend along the longitudinal direction X" is not limited to an embodiment in which they extend parallel to the longitudinal direction X, but broadly includes an embodiment in which they extend linearly in the longitudinal direction X as a whole. The first slit 13 and the second slit 14 may be linear, or may be partially bent and/or meandering.

The first slit 13 and the second slit 14 are cuts formed in the thickness direction Z of the absorber 4. The width of the first slit 13 and the second slit 14 in the lateral direction Y is, for example, 1.0 mm or less, preferably 0.5 mm or less, and it is particularly preferable that the first slit 13 and the second slit 14 have substantially no width. That is, the slit of the present invention preferably has substantially no width under no load, but forms an opening when external force is applied. As shown in FIG. 2, the first slit 13 and the second slit 14 preferably penetrate the absorbent body 4, which is a laminate of absorbent sheets 40. On the other hand, the first slit 13 and the second slit 14 are not formed in the sublayer sheet 5, the topsheet 2, and the backsheet 3 other than the absorber 4.

In this embodiment, in the first slit row L1 and the second slit row L2 that are adjacent to each other in the lateral direction Y, at least one second slit 14 is laterally connected to the interval portion 15 between the first slits 13 in the first slit row L1. They are arranged to face each other in direction Y. That is, in the first slit row L1 and the second slit row L2 that are adjacent to each other across the boundary between the first laminated portion 11 and the second laminated portion 12, the first slit 13 and the second slit 14 are shifted in the vertical direction Placed. In this configuration, it is sufficient that at least one second slit 14 faces the spacing portion 15, but it is preferable that a plurality of second slits 14 face the spacing portion 15, respectively.

[Effects of the above configuration]
In the above configuration, the absorbent body 4 is configured to have a laminated structure of a plurality of absorbent sheets 40, so that the absorbent body 4 is configured to be thin. As a result, in addition to the top sheet 2 having a soft texture mainly composed of water-absorbing fibers, the hard feel caused by the absorbent body 4 can be suppressed, and the feeling of wearing the napkin 1 (absorbent article) can be improved. Furthermore, since the absorbent body 4 has a plurality of slits 13 and 14, menstrual blood easily permeates into the slits 13 and 14, and diffusion of menstrual blood into the interior of the absorbent body 4 can be promoted. Thereby, the transfer of menstrual blood in the thickness direction Z from the topsheet 2 to the absorbent core 4 can be promoted, and excessive diffusion of menstrual blood within the plane of the topsheet 2 can be suppressed.

Further, the absorbent body 4 having the above configuration is arranged at least partially in the first slit row L1 disposed in the first laminated portion 11 and in the second laminated portion 12 on the outside in the lateral direction Y of the first slit row L1. It has a second slit row L2. As a result, the first slit row L1 not only promotes the migration of menstrual blood in the thickness direction Z in the first laminated part 11 located in the area facing the excretory part, but also in the second laminated part 12 on the outside in the lateral direction Y. Transfer of menstrual blood in the thickness direction Z can be promoted. Furthermore, in the present embodiment, in the first slit row L1 and the second slit row L2 that are adjacent to each other in the lateral direction Y, at least one second slit 14 is arranged in the interval portion 15 between the first slits 13 of the first slit row L1. and are arranged to face each other in the lateral direction Y. Thereby, in the top sheet 2, the second slits 14 more reliably remove menstrual blood that has not been absorbed from the region above the interval portion 15 of the first slit 13 and has spread to the region above the second laminated portion 12. It can be transferred to the non-skin side. Therefore, according to the napkin 1 (absorbent article) having the above structure, it is possible to suppress the diffusion of excessive menstrual blood within the plane of the top sheet 2, the resulting wet feeling over a wide range, and the side leakage, and prevent the wearer from wearing it. can increase the sense of security against leakage.

[Sublayer sheet configuration example]
As mentioned above, the napkin 1 preferably includes a hydrophilic sublayer sheet 5 disposed between the topsheet 2 and the absorbent core 4. In this configuration, the sublayer sheet 5 preferably has lower water absorption than the topsheet 2. As a result, the sublayer sheet 5 has a structure that makes it difficult to retain menstrual blood, and can quickly transfer menstrual blood to the absorbent body 4 side. Therefore, the transfer of menstrual blood in the thickness direction Z from the topsheet 2 to the absorbent core 4 can be promoted, and excessive spread of menstrual blood on the topsheet 2 can be suppressed.

In addition, in this specification, "high water absorption" means that the above-mentioned official moisture content is high. In addition, examples of the constituent material of the hydrophilic sublayer sheet 5 include a hydrophobic material treated to make it hydrophilic, and a material that is itself hydrophilic. In particular, from the viewpoint of imparting hydrophilicity while suppressing water absorption, the constituent material of the sublayer sheet 5 is preferably a hydrophobic material treated to make it hydrophilic.

Specifically, the sublayer sheet 5 is made of, for example, a nonwoven fabric, a fiber aggregate, and/or a film material, and is preferably made of a nonwoven fabric. Examples of the nonwoven fabric include air-through nonwoven fabric, spunbond nonwoven fabric, resin bonded nonwoven fabric, spunlace nonwoven fabric, and airlaid nonwoven fabric. The constituent fibers of the sublayer sheet 5 are preferably thermoplastic fibers from the viewpoint of suppressing water absorption as described above. Specifically, thermoplastic fibers include, for example, polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate, acrylic resins such as polyacrylic acid and polymethacrylic acid, and vinyl resins such as polyvinyl chloride. and polyamide resins such as nylon. Among these various raw materials, conjugate fibers (core-sheath type conjugate fibers and side-by-side type conjugate fibers) made of a combination of two types of resins can also be used as the constituent fibers. The sublayer sheet 5 can use one type of constituent fiber alone or a combination of two or more constituent fibers.

[Example of configuration of top sheet 2]
It is preferable that the top sheet 2 is composed of a single layer sheet material mainly containing cotton fibers. Since the top sheet 2 mainly contains cotton fibers, in addition to the sense of security that comes from being made of natural fibers, it can achieve high water absorption and hygroscopicity as well as a soft texture. In addition, since the top sheet 2 is composed of such a single-layer sheet material, there is no need for an adhesive or the like to bond between the sheets, and the top sheet 2 has a homogeneous and softer texture without localized hardness. can be realized.

Furthermore, it is preferable that the top sheet 2 has a substantially flat non-skin side surface 2b. Here, "substantially flat" means that the non-skin side surface 2b is uniformly flat when viewed macroscopically, and microscopic unevenness of about 3 mm is allowed. Note that the determination as to whether or not the non-skin side surface 2b is substantially flat is made, for example, in an area excluding an area that has been processed with compression such as a compressed groove. Further, the skin side surface 2a of the topsheet 2 may have irregularities, but preferably has a substantially flat configuration. In other words, it is preferable that the topsheet 2 has a structure such that when it is placed alone on a flat surface, the cotton fibers are uniformly filled along the flat surface. In addition, when the skin side surface 2a of the topsheet 2 has an uneven structure, it is preferable from the viewpoint of the absorption performance of body fluids that the protrusions are filled with water-absorbing fibers.

The top sheet 2 configured as described above can bring the entire non-skin side surface 2b close to the sublayer sheet 5, and can promote the transfer of menstrual blood from the top sheet 2 side to the sublayer sheet 5. Thereby, the diffusion of menstrual blood in the thickness direction Z from the top sheet 2 to the absorbent core 4 can be promoted while taking advantage of the soft texture of cotton.

[Example of structure of absorber]
As described above, in the absorbent body 4, the plurality of absorbent sheets 40 include one or more main body absorbent sheets 41 disposed across the first laminated portion 11 and the second laminated portion 12, and the first laminated portion 11. one or more central absorbent sheets 42 disposed therein. Furthermore, as shown in FIG. 2, the main absorbent sheet 41 has a skin-side absorbent section 43 and a non-skin-side absorbent section 44 that are laminated in the thickness direction Z, and the central absorbent sheet 42 has a first laminated section. 11, it is preferable to arrange it between the skin side absorption part 43 and the non-skin side absorption part 44.

The skin-side absorbent section 43 and the non-skin-side absorbent section 44 may be formed, for example, by folding a large body absorbent sheet 41, or by laminating a plurality of body absorbent sheets 41 of the same shape in the thickness direction Z. It may be formed by In the example shown in FIG. 2, one body absorbent sheet 41 is folded back to the non-skin side at the lateral Y side edge of the absorbent core 4, and both ends of the sheet in the lateral Y direction are overlapped on the non-skin side. A skin-side absorbent section 43 and a non-skin-side absorbent section 44 are formed. The skin-side absorbent section 43 and the non-skin-side absorbent section 44 may each have either a single-layer structure or a multi-layer structure of the main body absorbent sheet 41, but from the viewpoint of making the absorbent body 4 thinner, a single-layer structure is preferable. Preferably, it is a structure.

In the above configuration, the central absorbent sheet 42 is sandwiched between the skin-side absorbent section 43 and the non-skin-side absorbent section 44 of the main body absorbent sheet 41 in the first laminated section 11 . The central absorbent sheet 42 may have either a single-layer structure or a multi-layer structure, but from the viewpoint of improving the absorption performance of the second laminated portion 12, it is preferably a multi-layer structure. Furthermore, when the central absorbent sheet 42 has a multilayer structure, it may have a configuration in which one central absorbent sheet 42 is folded, or a configuration in which a plurality of central absorbent sheets 42 are laminated in the thickness direction Z. In the example shown in FIG. 2, the central absorbent sheet 42 has a configuration in which it is folded into three.

With such a configuration, it is possible to easily form the absorbent body 4 having the first laminated part 11 and the second laminated part 12 having different numbers of laminated layers. Further, by arranging the central absorbent sheet 42 between the skin-side absorbent section 43 and the non-skin-side absorbent section 44 of the main body absorbent sheet 41, it is possible to suppress the positional shift of the central absorbent sheet 42, and also to prevent the central absorbent sheet 42 from shifting. It is possible to suppress side protrusion and achieve a good feeling of wearing with less discomfort.

Further, as shown in FIG. 2, it is preferable that the end portion 42a of the central absorbent sheet 42 is not joined to the main absorbent sheet 41 at the boundary between the first laminated portion 11 and the second laminated portion 12. In this configuration, the end portion 42a of the central absorbent sheet 42 is an end portion in the longitudinal direction Consists of. With the above configuration, when the first slit 13 and/or the second slit 14 near the boundary portion open due to deformation of the absorbent body 4, the central absorbent sheet 42 and the main absorbent sheet 41 are not restrained from each other. The degree of freedom in deformation is increased. Therefore, wrinkles and twists are less likely to occur in the absorbent body 4 in the vicinity of the boundary, and it is possible to suppress a decrease in wearing comfort due to such wrinkles and twists.

Moreover, as shown in FIG. 2, it is preferable that the central absorbent sheet 42 is not joined to the non-skin side absorbent part 44 of the main body absorbent sheet 41. Thereby, the transfer of menstrual blood to the non-skin-side absorbent portion 44 can be promoted, and the menstrual blood can be retained in the non-skin-side absorbent portion 44 that is separated from the top sheet 2. Therefore, it is possible to suppress redness and liquid residue due to menstrual blood on the top sheet 2, and it is possible to effectively suppress the feeling of anxiety about leakage.

On the other hand, as shown in FIG. 3, the central absorbent sheet 42 preferably has a joint region 17 joined to the skin-side absorbent portion 43 of the main absorbent sheet 41. In FIG. 3, the bonding area 17 is represented by a dot pattern, but the dots are for schematically showing the range of the bonding area 17. In this embodiment, the joining region 17 includes an adhesive H1 such as a hot melt adhesive that adheres the central absorbent sheet 42 and the skin-side absorbent section 43, as shown in FIG. The adhesive H1 is applied intermittently so that coated areas and non-coated areas are mixed, from the viewpoint of increasing the flexibility of the bonding area 17 and promoting the transfer of menstrual blood to the central absorbent sheet 42. It is preferable that the Examples of the latter type of intermittent coating pattern include spiral, summit, omega, curtain, and stripe patterns. When the adhesive H1 is applied intermittently, the bonding region 17 is an area obtained by surrounding the outer edge of the adhesive H1 coated area and includes a non-coated area.

Moreover, as shown in FIG. 3, the bonding region 17 preferably overlaps with the first slit 13 in a plan view seen from the thickness direction Z. In this case, the bonding region 17 only needs to overlap with at least one first slit 13 . The presence of the first slit 13 within the bonding region 17 makes it difficult for the first slit 13 to shift in position in the skin-side absorbent section 43 and the central absorbent sheet 42 even if the absorbent core 4 is deformed during wear. This facilitates the transfer of menstrual blood from the skin-side absorbent section 43 to the central absorbent sheet 42 via the first slit 13. Therefore, it becomes easier to transfer menstrual blood to the inside of the absorbent core 4, and the transfer of menstrual blood from the top sheet 2 to the absorbent core 4 in the thickness direction Z can be promoted more effectively.

[Example of slit arrangement]
As shown in FIG. 3, in two first slit rows L1 adjacent in the horizontal direction Y, the first slits 13 belonging to one first slit row L1 are spaced between the first slits 13 belonging to the other first slit row L1. It is preferable that they be arranged so as to face the interval portion 15 of , in the lateral direction Y. That is, in this example, the first slits 13 of the two first slit rows L1 that are adjacent in the horizontal direction Y are shifted in the vertical direction X. This makes it easier for menstrual blood that has not been absorbed in the interval portion 15 of one first slit row L1 to migrate to the first slit 13 of the other first slit row L1. Therefore, the migration of menstrual blood in the thickness direction Z in the region of the topsheet 2 facing the excretion part can be further promoted, and the remaining of menstrual blood on the surface and the spread in the plane can be more effectively suppressed.

Note that the arrangement of the slits 13 and 14 is not limited to the example shown in FIG. 3. For example, even if the interval portions 15 of two first slit rows L1 adjacent in the horizontal direction Y face each other in the horizontal direction Y, and the first slits 13 of these first slit rows L1 are aligned in the vertical direction good.

Further, as shown in FIG. 3, the first slit row L1 preferably extends forward and backward in the longitudinal direction X from the first laminated portion 11. Thereby, migration of menstrual blood in the thickness direction Z can be promoted in the entire first laminated portion 11. However, the first slit row L1 does not need to extend from the first laminated portion 11.

[Example of adhesive placement]
In the napkin 1, in addition to the adhesive H1 disposed in the bonding region 17, an adhesive for bonding adjacent members may be disposed. For example, as shown in FIG. 2, an adhesive H2 for bonding to the sublayer sheet 5 may be disposed on the non-skin side surface 2b of the top sheet 2. Further, an adhesive H3 for bonding to the sublayer sheet 5 may be disposed on the skin side of the absorbent body 4 (the skin side of the main body absorbent sheet 41). Further, an adhesive H4 for bonding the back sheet 3 to the non-skin side of the absorbent body 4 (the non-skin side of the main body absorbent sheet) may be disposed.

[Numerical example regarding absorber]
The thickness of the first laminated portion 11 of the absorbent body 4 is preferably 0.7 mm or more, more preferably 1 mm or more, and preferably 5 mm or less, from the viewpoint of achieving both thin and good wearing comfort and absorption performance. , more preferably 4 mm or less. More specifically, the thickness of the first laminated portion 11 is preferably 0.7 mm or more and 5 mm or less, and more preferably 1 mm or more and 4 mm or less. The thickness of the second laminated portion 12 of the absorbent body 4 is preferably 0.3 mm or more, more preferably 0.5 mm or more, and preferably is 3 mm or less, more preferably 2.5 mm or less. More specifically, the thickness of the second laminated portion 12 is preferably 0.3 mm or more and 3 mm or less, and more preferably 0.5 mm or more and 2.5 mm or less.

Further, in the absorber 4, the thickness difference (step) between the first laminated portion 11 and the second laminated portion 12 at or near the boundary is preferably 2 mm or less, and more preferably 1.5 mm or less. preferable. Thereby, in the intermediate region B, it is possible to suppress the occurrence of twisting near the boundary between the first laminated portion 11 and the second laminated portion 12. More specifically, if this level difference is large, when the napkin 1 follows the wearer's movements while being worn, it will try to fill the gap caused by the level difference, and as a result, the napkin 1 may tend to twist due to the effect of the level difference. By setting the level difference within the above range, the effect of suppressing the occurrence of wobbling in the intermediate region B is enhanced. The thickness of each part of the absorbent body 4 described above is measured by the following method.

<Measurement method of absorber thickness>
The absorbent material to be measured is placed on a horizontal surface without wrinkles or bends, and the thickness is measured under a load of 5 cN/cm ² . To measure the thickness in this invention, a thickness meter PEACOCKDIAL UPRIGHT GAUGES R5-C (manufactured by OZAKI MFG.CO.LTD.) is used. At this time, a circular or square plate (an acrylic plate with a thickness of about 5 mm) in plan view is placed between the tip of the thickness gauge and the measurement part of the object to be measured, and the load is 5 cN/cm ² . Adjust the size of the plate so that

The thickness of one absorbent sheet 40 in the thickness direction Z is preferably 0.1 mm or more, more preferably 0.3 mm or more, and preferably 2 mm or less, more preferably It is 1.5 mm or less. More specifically, the thickness is preferably 0.1 mm or more and 2 mm or less, and more preferably 0.3 mm or more and 1.5 mm or less.

The dimension in the longitudinal direction X of the slits 13, 14 belonging to each slit row L1, L2 is preferably 10 mm or more, more preferably 15 mm or more, and preferably 35 mm or less, more preferably 25 mm or less. The interval in the longitudinal direction X between the slits 13 and 14 belonging to each slit row L1 and L2 is preferably 3 mm or more, more preferably 7 mm or more, and preferably 20 mm or less, more preferably 15 mm or less. Further, the number of slits 13, 14 belonging to each slit row L1, L2 is preferably 3 or more, more preferably 8 or more, and preferably 34 or less, more preferably 25 or less.

The number of the first slit rows L1 is preferably one or more, more preferably two or more, from the viewpoint of preventing damage to the first laminated part 11 and improving the ability to draw menstrual blood in the first laminated part 11. The number is preferably 20 or less, more preferably 15 or less. The number of the second slit rows L2 is preferably two or more, more preferably six or more, from the viewpoint of preventing damage to the second laminated part 12 and improving the ability to draw menstrual blood in the second laminated part 12. The number is preferably 14 or less, more preferably 10 or less.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

1...Absorbent sanitary articles (sanitary napkins, napkins)
2...Top sheet 3...Back sheet 4...Absorber 40...Absorbent sheet 11...First laminated section 12...Second laminated section 13...First slit 14...Second slit L1...First slit row L2...Second slit Row A...Front area B...Middle area C...Back area

Claims (7)

an absorbent body, a top sheet disposed on the skin side of the absorbent body, and a back sheet disposed on the non-skin side of the absorbent body; A sanitary absorbent article having a lateral direction perpendicular to the direction and corresponding to the left-right direction of the wearer, and a thickness direction perpendicular to the longitudinal direction and the lateral direction,
In the longitudinal direction, it is divided into an intermediate region including a portion facing the wearer's excretory part, a front region located in front of the intermediate region, and a rear region located behind the intermediate region,
The top sheet mainly contains water-absorbing fibers,
The absorbent body has a laminated structure including a plurality of absorbent sheets, and
a first laminated portion located at the lateral center of the intermediate region;
a second laminated part having a smaller number of laminated absorbent sheets than the first laminated part and located around the first laminated part in the vertical direction and the horizontal direction;
a first slit row including a plurality of first slits arranged at intervals along the longitudinal direction;
a second slit row including a plurality of second slits arranged at intervals along the longitudinal direction;
The first slit row is at least partially disposed in the first stacked section,
The second slit row is arranged in the second laminated portion on the laterally outer side of the first slit row,
In the first slit row and the second slit row that are adjacent to each other in the horizontal direction, at least one second slit in the second slit row has a space between the first slits in the first slit row and the second slit row. Absorbent articles for sanitary use that are arranged to face each other laterally. further comprising a hydrophilic sublayer sheet disposed between the top sheet and the absorbent body,
The sanitary absorbent article according to claim 1, wherein the sublayer sheet has lower water absorption than the top sheet. The top sheet is
Consisting of a single layer sheet material containing mainly cotton fibers, and
The sanitary absorbent article according to claim 1 or 2, having a substantially flat non-skin side. The plurality of absorbent sheets are
one or more main body absorbent sheets arranged across the first laminated portion and the second laminated portion;
one or more central absorbent sheets disposed only in the first laminated portion,
The main body absorbent sheet is
The skin-side absorbent portion and the non-skin-side absorbent portion are laminated in the thickness direction,
The central absorbent sheet is
The sanitary absorbent article according to claim 1 or 2, wherein the first laminated part is arranged between the skin-side absorbent part and the non-skin-side absorbent part. The sanitary absorbent article according to claim 4, wherein an end portion of the central absorbent sheet is not joined to the main absorbent sheet at a boundary between the first laminated portion and the second laminated portion. The sanitary absorbent article according to claim 4, wherein the central absorbent sheet is not joined to the non-skin side absorbent part. The central absorbent sheet has a joint region joined to the skin-side absorbent part,
The sanitary absorbent article according to claim 4, wherein the bonding region overlaps the first slit in a plan view from the thickness direction.

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