JP2018075141A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article excellent in an absorption performance such as absorption rate and diffusibility.SOLUTION: At least a crotch part of an absorber 30 does not contain fluff pulp or high absorbent polymer but is provided with two pairs of left and right linear slit parts 31 extending in a longitudinal direction of an absorber 30 in a nearly central part in a width direction of the absorber 30, a pair of left and right slit parts 311 of an upper layer absorber 301 and a pair of left and right slit parts 312 of the lower layer absorber 302 corresponding to the upper layer absorber 301 in the thickness direction are arranged in the way that they at least partly overlap in the thickness direction of the absorber 30. In an absorbent article 1, at least the upper layer absorber 301 of the absorber 30 is provided with almost hexagonal honeycomb-shaped embossed patterns 32, and a proportion of a gap in the width direction of the pair of left and right slit parts 311 arranged in at least the upper layer absorber 301 of the absorber 30 in terms of the dimension in the width direction of the almost hexagonal structure 321 composing the embossed patterns 32 is between 70% and 150%.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an absorbent article such as a light incontinence pad, a pants-type paper diaper, and a taped paper diaper, and more particularly to a relatively large paper diaper.

  In general, absorbent articles such as light incontinence pads, pants-type paper diapers, taped paper diapers, etc. are composed of a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between both sheets. , Is composed of. Thereby, body fluids, such as urine, are absorbed by an absorber through a top sheet, and do not leak outside by a back sheet. Such an absorbent article has been devised in various ways to improve the absorbability of body fluids, improve the wearer's wearing feeling, prevent leakage, and the like.

  In Patent Document 1, in order to maintain the effect of the groove even when liquid absorption or external force is applied, the absorption speed is not lowered, and the deterioration of the wearing feeling is prevented, so that the groove shape or It is provided with an absorbent recess formed in a slit shape, and embossed from the surface side of the liquid-permeable surface sheet, with an emboss width smaller than the groove width of the absorbent recess along the absorbent recess inside the absorbent recess An absorbent article provided with an embossed portion is disclosed.

  In Patent Document 2, an upper opening is provided in the upper absorbent body and the upper absorbent body extends in the longitudinal direction and at least partly extends to the lower absorbent body for the purpose of absorbing urine effectively by SAP with high liquid diffusibility. A lower opening portion that overlaps with each other, and a plurality of superabsorbent polymers (SAP) are disposed between the upper layer absorber and the lower layer absorber in the width direction of the opening penetrating portion where at least the upper opening portion and the lower opening portion overlap each other. An absorbent article provided with SAP layers formed on both the left and right sides is disclosed.

JP 2015-47432 A Japanese Patent Laid-Open No. 2006-140559

  Here, in patent document 1 and patent document 2, the diffusion path | route of the bodily fluid in an absorber is improved by providing a slit in an absorber, but when an absorber consists of two layers, and in each absorber When a plurality of slits are provided, problems may arise in the absorption performance such as the absorption speed unless the arrangement of the slits in the thickness direction in each absorber and the interval in the width direction of each slit are adjusted. On the other hand, even when the slit is not provided in the absorber, when the absorbent polymer absorbs the body fluid and swells, the path through which the body fluid diffuses in the absorber is blocked, so the absorption speed may be slowed down, In addition, there may be a problem with diffusibility.

  Therefore, an object of the present invention is to provide an absorbent article excellent in absorption performance such as absorption rate and diffusibility.

In view of the above problems, the present inventors conducted extensive research. As a result, a predetermined slit portion is provided at least in the crotch portion of the absorber composed of two layers of the upper layer absorber and the lower layer absorber, and a predetermined emboss pattern is provided in at least the upper layer absorber among the absorber, and the slit portion and the emboss pattern It was found that the above-mentioned problems can be solved by setting the value in a predetermined numerical range, and the present invention has been completed. Specifically, the present invention provides the following.
(1) An embodiment of the present invention is an absorbent article having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the top sheet and the back sheet. The absorbent body has an abdominal part, a back part, and a crotch part between the abdomen part and the back part, and is located on the skin contact surface side, and on the non-skin contact surface side. It consists of two layers of the lower-layer absorber positioned, and at least the crotch portion of the absorber has a pair of left and right linear slit portions extending in the longitudinal direction of the absorber at two substantially central portions in the width direction of the absorber. This provided, the slit portion does not include fluff pulp and superabsorbent polymer, and a pair of left and right slits of the lower layer absorber corresponding to the pair of left and right slit portions of the upper layer absorber and the upper layer absorber. At least in the thickness direction of the absorber. The at least upper absorbent body of the absorbent body is provided with a substantially hexagonal honeycomb-shaped emboss pattern, and the absorption with respect to the dimension in the width direction of the substantially hexagonal structure constituting the emboss pattern is arranged. Absorptivity wherein slit interval / emboss pattern width × 100 (%), which is the ratio of the interval in the width direction of the pair of left and right slits arranged in at least the upper absorbent body of the body, is 70% or more and 150% or less It is an article.
(2) In the absorbent article according to (1), in the upper-layer absorbent body, the weight of fluff pulp / the weight of the superabsorbent polymer, which is the ratio of the weight of fluff pulp to the weight of the superabsorbent polymer × 100 (%) is 240% or more and 320% or less, and similarly, in the lower layer absorber, the ratio (%) of the fluff pulp weight to the weight of the superabsorbent polymer is 150% or more and 200% or less. Also good.
(3) In the absorbent article according to (1) or (2), each of the slit portions of the upper layer absorber and the lower layer absorber has a longitudinal dimension of the upper layer absorber or the lower layer absorber. 20% or more and 50% or less with respect to the total length in the longitudinal direction, and the dimension in the width direction is 2% or more and 6% or less with respect to the longest width in the width direction of the upper layer absorber or the lower layer absorber. The slit interval, which is the interval in the width direction of each slit portion of the absorber and the lower layer absorber, is 3% or more and 15% or less with respect to the longest width in the width direction of the upper layer absorber or the lower layer absorber. Also good.
(4) In the absorbent article according to any one of (1) to (3), each dimension in the width direction of the slit portion of the lower layer absorber is each in the width direction of the slit portion of the upper layer absorber. It may be wider than the dimension.
(5) In the absorbent article according to any one of (1) to (4), the substantially hexagonal structure constituting the embossed pattern has a dimension in the width direction of 10 mm or more and 40 mm or less, and a dimension in the longitudinal direction. 20 mm or more and 45 mm or less may be sufficient.
(6) In the absorbent article according to any one of (1) to (5), a total of seven repetition absorption rates may be 200 seconds or less.
(7) In the absorbent article according to (6) above, the liquid diffusion distance after seven measurements of the repeated absorption rate may be 90% or more.

  The absorbent article of the present invention has a pair of left and right linear slits extending in the longitudinal direction of the absorber at the center of the absorber in the width direction at least in the crotch portion of the absorber composed of two layers, an upper layer absorber and a lower layer absorber. At least a part of the pair of left and right slit portions of the upper layer absorber and the pair of left and right slit portions of the lower layer absorber corresponding to the upper layer absorber in the thickness direction overlap each other in the thickness direction of the absorber. Are arranged as follows. Thereby, it can be set as an absorptive article with a good absorption rate of a bodily fluid. In the absorbent article of the present invention, a substantially hexagonal honeycomb-like emboss pattern is provided on at least the upper absorbent body of the absorbent body. Thereby, it can be set as the absorbent article with the favorable diffusibility of the bodily fluid in an absorber. Furthermore, the absorbent article of the present invention is the ratio of the distance in the width direction of the pair of left and right slit portions arranged in at least the upper layer absorbent body of the absorbent body to the dimension in the width direction of the substantially hexagonal structure constituting the emboss pattern. A certain slit interval / emboss pattern width × 100 (%) is 70% or more and 150% or less. Thereby, it can be set as the absorptive article which is excellent in absorption rate and diffusibility, and excellent also in repetition absorption rate.

It is the top view which looked at the absorptive article concerning the embodiment of the present invention from the top sheet side. In the absorbent article which concerns on embodiment of this invention, it is structure explanatory drawing for demonstrating the structure of the slit part and embossing pattern of the crotch part of an upper layer absorber. FIG. 3 is a schematic cross-sectional view for illustrating a cross section of the absorbent article taken along line AA in FIGS. 1 and 2. It is the schematic of the embossing pattern in the absorber of the absorbent article which concerns on embodiment of this invention. It is drawing which shows the test apparatus for evaluation of a repetition absorption rate. It is a graph which shows the result of evaluation of a repetition absorption rate.

  Embodiments of the present invention will be described in detail below, but these are given for illustrative purposes and do not limit the present invention. In addition, the same code | symbol is attached | subjected to the same element throughout the description of embodiment. Moreover, in description of this specification, the time of wearing of the absorbent article 1 means at least one after wearing of the absorbent article 1 and after wearing. The longitudinal direction of the absorbent article 1 is a direction extending before and after the wearer when the absorbent article 1 is worn, and is a direction indicated by a symbol Y in the figure. Moreover, the width direction of the absorbent article 1 is a direction that is transverse or orthogonal to the longitudinal direction, and is a direction indicated by a symbol X in the drawing. Furthermore, the skin contact surface is a surface that is disposed on the wearer's skin side during wearing among the front and back surfaces of each member such as the absorber, and the non-skin contact surface is each member such as the absorber. Of the front and back surfaces, the surface is directed to the side opposite to the wearer's skin when worn. Body fluid refers to fluid discharged from the body, such as urine, blood, and water in loose stool. Further, examples of the absorbent article 1 include light incontinence pads, pants-type paper diapers, and tape-fastened paper diapers, regardless of whether they are for babies or adults. There may be.

[Absorbent articles]
Drawing 1 is a top view which looked at absorptive article 1 concerning an embodiment of the present invention from the top sheet 20 side. As shown in FIG. 1, the absorbent article 1 includes a liquid-permeable top sheet 20 disposed on the skin contact surface side, and a liquid imprint disposed on the non-skin contact surface side facing the top sheet 20. A permeable back sheet, and an absorbent body 30 disposed between the top sheet 20 and the back sheet. Thereby, the absorber 30 has a structure sandwiched between the top sheet 20 and the back sheet. In addition, although it has shown with the broken line about the slit part 31 and the embossing pattern 32 which were provided in the absorber 30, it has the predetermined structure mentioned later.

  Moreover, in order to prevent the side leakage of the body fluid excreted by the user, the absorbent article 1 has a pair of three-dimensional three-dimensional elastic members on the top sheet 20 along the longitudinal direction of the absorbent article 1. A gather may be provided (not shown). The outer end of the three-dimensional gather in the width direction of the absorbent article 1 is fixed to the back sheet, the inner end is fixed to the top sheet 20, and the center is a free end that is not fixed to the top sheet 20. A sheet is arranged. By providing the elastic member for three-dimensional gathering along the longitudinal direction, the three-dimensional gather has uprightness and can be deformed in accordance with the wearer's body shape. As the elastic member for three-dimensional gather, for example, polyurethane yarn, band-like polyurethane film, yarn-like or band-like natural rubber, etc. are used, and as the three-dimensional gather sheet, water repellency or liquid impermeability formed of hydrophobic fibers. Non-woven fabrics such as spunbond nonwoven fabrics, meltblown nonwoven fabrics, and composite nonwoven fabrics laminated with spunbond / meltblown / spunbond are used.

<Top sheet>
The top sheet 20 only needs to be formed from a base material having liquid permeability that allows body fluid to move to the absorbent body 30. For example, a nonwoven fabric such as an air-through nonwoven fabric, a thermal bond nonwoven fabric, and a spunbond nonwoven fabric, It is formed from a material such as a composite nonwoven fabric obtained by laminating spunbond, an open film such as an open polyethylene film, a foam film such as polyethylene foam or urethane foam, or a composite sheet obtained by laminating these. The top sheet 20 may be embossed or perforated on the surface in order to improve liquid permeability. As a method for performing these embossing and perforating processes, a known method can be carried out without limitation. In order to reduce irritation to the skin, the top sheet 20 may contain a lotion, an antioxidant, an anti-inflammatory component, a pH adjuster, an antibacterial agent, a moisturizing agent, and the like.

From the viewpoints of strength, workability, and liquid return amount, the basis weight of the top sheet 20 is preferably 18 g / m ² or more and 40 g / m ² or less. Although there is no restriction | limiting in particular as a shape of the top sheet 20, What is necessary is just the shape which covers the absorber 30 required in order to guide a bodily fluid to the absorber 30 so that there may be no leak.

<Back sheet>
The back sheet may be formed by using a base material having liquid impermeability so that the body fluid held by the absorbent body 30 does not wet the clothing, and the resin film or the resin film and the nonwoven fabric are laminated. It is formed from a material such as a composite sheet. The non-woven fabric used for the composite sheet is not particularly limited, and examples thereof include a spunbond nonwoven fabric and a meltblown nonwoven fabric, or a composite nonwoven fabric obtained by laminating spunbond / meltblown, spunbond / meltblown / spunbond, and composite materials thereof. Can be mentioned. Examples of the resin film include polyester, polyvinyl alcohol, polyethylene, polypropylene, and a composite film of polyethylene and polypropylene.

From the viewpoint of strength and workability, the basis weight of the back sheet is preferably 15 g / m ² or more and 40 g / m ² or less. Moreover, in order to prevent the stuffiness at the time of mounting | wearing, it is preferable to give air permeability to a back seat | sheet. In order to provide the back sheet with air permeability, for example, a filler may be added to the resin film of the base material, or the back sheet may be embossed. In addition, calcium carbonate can be mentioned as a filler, The compounding method can perform a well-known method without a restriction | limiting.

<Absorber>
As shown in FIG. 1, in the absorbent article 1 of the present invention, the absorbent body 30 has an abdominal side part, a crotch part, and a back side part.

(Upper layer absorber and lower layer absorber)
The absorbent article 1 of the present invention is composed of two layers of an upper layer absorbent body 301 located on the skin contact surface side and a lower layer absorbent body 302 located on the non-skin contact surface side.

  As shown in FIG. 2, the longitudinal dimension L0 of the absorbent body 30 is preferably 350 mm or more and 1000 mm or less, and more preferably 400 mm or more and 950 mm or less. Moreover, the dimension W0 of the longest width in the width direction of the absorbent body 30 is preferably 100 mm or more and 600 mm or less, and more preferably 140 mm or more and 520 mm or less.

  The longitudinal dimension of the upper absorbent body 301 is preferably 350 mm or more and 1000 mm or less, and more preferably 400 mm or more and 950 mm or less. The longitudinal dimension of the lower layer absorbent body 302 is preferably 350 mm or more and 1000 mm or less, and more preferably 400 mm or more and 950 mm or less. In addition, it is preferable that the dimension of the longitudinal direction of the upper layer absorber 301 and the lower layer absorber 302 is the same.

  The dimension in the width direction of the upper layer absorber 301 is preferably 100 mm or more and 600 mm or less, and more preferably 140 mm or more and 520 mm or less. The widthwise dimension of the lower layer absorbent body 302 is preferably 80 mm or more and 550 mm or less, and more preferably 90 mm or more and 500 mm or less. In addition, it is preferable that the dimension of the width direction of 301 of an upper layer absorber is larger than the dimension of the width direction of the lower layer absorber 302. FIG.

(Absorbent fiber)
The absorber 30 contains an absorbent fiber as a base material and a superabsorbent polymer (SAP). The total basis weight of each of the upper layer absorber 301 and the lower layer absorber 302 is preferably 150 g / m ² or more and 600 g / m ² or less, and more preferably 200 g / m ² or more and 400 g / m ² or less. .

The absorbent fiber is not particularly limited as long as it is generally used for absorbent articles such as sanitary napkins, paper diapers, and urine pads. For example, fluff pulp, cotton, rayon, acetate, tissue, absorbent paper, hydrophilic paper Can be mentioned. Among these, it is preferable to use fluff pulp from the viewpoint of absorbability. Examples of fluff pulp include wood pulp (for example, softwood bleached kraft pulp (N-BKP) such as Southern pine or Douglas fir), synthetic fiber, resin fiber, non-wood pulp, etc. it can. When fluff pulp is used for the absorbent fiber as the base material for the absorbent body 30, the basis weight of the absorbent fiber is preferably 100 g / m ² or more and 500 g / m ² or less for the entire upper layer absorbent body 301. 100 g / m ² or more and 340 g / m ² or less, more preferably 100 g / m ² or more and 550 g / m ² or less, and 200 g / m ² or more and 400 g / m ² or less. More preferably, it is ² or less. Thereby, more body fluids can be absorbed without impairing the touch.

(Super absorbent polymer)
The superabsorbent polymer of the absorbent body 30 is not particularly limited as long as it can absorb body fluid and prevent backflow, and is a sodium polyacrylate-based, polyaspartate-based, (starch-acrylic acid) graft. Those formed from materials such as a copolymer, (acrylic acid-vinyl alcohol) copolymer, (isobutylene-maleic anhydride) copolymer and saponified product thereof can be used. Among these, sodium polyacrylate is preferable from the viewpoint of the amount of absorption per weight.

The basis weight of the SAP contained in the absorber 30 is preferably 50 g / m ² or more and 500 g / m ² or less, and 80 g / m ² or more and 400 g / m ² or less in the entire upper layer absorber 301. still more preferably, the entire lower absorbent body 302, is preferably 50 g / ^{m 2} or more 500 g / ^{m 2} or less, and more preferably 100 g / ^{m 2} or more 430 g / ^{m 2} or less. By setting it within the above numerical range, gel blocking in the absorber 30 can be prevented, and a large amount of body fluid can be absorbed in the absorber 30.

  Further, in the upper layer absorbent body 301, the ratio of the weight of fluff pulp to the weight of the superabsorbent polymer, the weight of fluff pulp / the weight of the superabsorbent polymer × 100 (%) is 240% or more and 320% or less. It is preferable that it is 270% or more and 290% or less. Similarly, in the lower layer absorber 302, the ratio (%) of the fluff pulp weight to the weight of the superabsorbent polymer is preferably 150% or more and 200% or less, and more preferably 170% or more and 195% or less. More preferred.

  In the absorbent body 30, the form of the absorbent fiber and the SAP is preferably an SAP sheet formed by mixing SAP particles in the absorbent fiber, or an SAP sheet in which the SAP particles are fixed between the absorbent fibers. Further, for the purpose of preventing leakage of SAP particles and stabilizing the shape of the absorber 30, the absorber 30 may be wrapped in a carrier sheet. The base material of the carrier sheet is not particularly limited as long as it has hydrophilicity, and examples thereof include hydrophilic nonwoven fabrics such as tissue, absorbent paper, and airlaid nonwoven fabric. In the case where a plurality of carrier sheets are provided, the base material of the carrier sheet may be the same or different.

(Slit part)
As shown in FIGS. 1 and 2, the absorbent article 1 of the present invention has a pair of left and right linear slit portions 31 extending in the longitudinal direction of the absorbent body 30 at least in the crotch portion of the absorbent body 30. Two are provided at approximately the center in the width direction. Thereby, the path | route which a bodily fluid diffuses within the absorber 30 can be ensured, and it can be set as the absorbent article 1 excellent in the absorption rate. In addition, in FIG. 1, the slit part 31 provided in the absorber 30 which does not appear on a plane in the top view seen from the top sheet 20 side was illustrated with the broken line.

  The slit portion 31 does not include fluff pulp and superabsorbent polymer, and penetrates the absorber 30 in the thickness direction of the absorber 30.

  As shown in FIG. 3, the absorbent article 1 of the present invention includes a pair of left and right slit portions 311 of the upper layer absorbent body 301, and a pair of left and right slit portions of the lower layer absorbent body 302 corresponding to the upper layer absorbent body 301 in the thickness direction. 312 is arranged so that at least a part thereof overlaps in the thickness direction of the absorber 30. Moreover, it is preferable that each dimension of the width direction of the slit part 312 of the lower layer absorber 302 is wider than each dimension of the slit part 311 of the upper layer absorber 301 in the width direction. Thereby, it becomes the structure where the absorber 30 can absorb a bodily fluid easily, and it can be set as the absorbent article 1 excellent in the absorption rate.

  Each of the slit portions 31 of the upper layer absorber 301 and the lower layer absorber 302 preferably has a dimension in the longitudinal direction of 20% or more and 50% or less with respect to the total length of the upper layer absorber 301 or the lower layer absorber 302 in the longitudinal direction. More preferably, it is 25% or more and 45% or less.

  Moreover, each slit part 31 of the upper layer absorber 301 and the lower layer absorber 302 has a width dimension of 2% or more and 6% or less with respect to the longest width of the upper layer absorber 301 or the lower layer absorber 302 in the width direction. It is preferably 3% or more and 5% or less.

  In addition, each slit portion 31 of the upper layer absorber 301 and the lower layer absorber 302 has a slit interval D1 and a slit interval D2, which are intervals in the width direction, set to the longest width in the width direction of the upper layer absorber 301 or the lower layer absorber 302. On the other hand, it is preferably 3% or more and 15% or less, and more preferably 5% or more and 13% or less.

  By setting the slit portions 31 of the upper-layer absorber 301 and the lower-layer absorber 302 within the above numerical range, a path through which body fluid diffuses in the absorber 30 can be secured, and the absorbency is excellent in the absorption rate. Article 1 can be used.

  The longitudinal dimension L1 of each slit portion 311 of the upper layer absorbent body 301 is preferably 70 mm or more and 500 mm or less, and more preferably 100 mm or more and 428 mm or less. Moreover, it is preferable that the dimension W1 of the width direction of each slit part 311 of the upper layer absorber 301 is 7 mm or more and 60 mm or less, and it is more preferable that they are 12 mm or more and 48 mm or less. Moreover, it is preferable that it is 10 mm or more and 90 mm or less, and, as for slit space | interval D1 of each slit part 311 of the upper layer absorber 301, it is more preferable that it is 15 mm or more and 75 mm or less.

  The longitudinal dimension of each slit portion 312 of the lower layer absorber 302 is preferably 20 mm or more and 300 mm or less, and more preferably 35 mm or more and 234 mm or less. Moreover, it is preferable that the width direction dimension W2 of each slit part 312 of the lower layer absorber 302 is 6 mm or more and 82.5 mm or less, and it is more preferable that they are 7 mm or more and 65 mm or less. Moreover, it is preferable that it is 15 mm or more and 75 mm or less, and, as for slit space | interval D2 of each slit part 312 of the lower layer absorber 302, it is more preferable that it is 20 mm or more and 60 mm or less.

(Embossed pattern)
As shown in FIGS. 1 to 4, in the absorbent article 1 of the present invention, a substantially hexagonal honeycomb-shaped emboss pattern 32 is provided on at least the upper absorbent body 301 of the absorbent body 30. Thereby, it can be set as the absorbent article 1 with the favorable diffusibility of the bodily fluid in the absorber 30. FIG. In FIG. 1, in the plan view viewed from the top sheet 20 side, a substantially hexagonal honeycomb-shaped emboss pattern 32 provided on the absorber 30 that does not appear on the plane is shown by a broken line.

  In addition, when providing the substantially hexagonal honeycomb-shaped emboss pattern 32 also in the lower layer absorber 302 of the absorber 30, it is preferable to provide it in the same manner as the upper layer absorber 301 unless otherwise specified.

  In FIG. 2, a substantially hexagonal honeycomb-shaped emboss pattern 32 provided on the absorbent body 30 is shown only in the longitudinal dimension of the slit portion 31. As shown in FIG. 4, the substantially hexagonal structure 321 constituting the embossed pattern 32 preferably has a width-direction dimension W3 of 10 mm or more and 40 mm or less, and more preferably 12 mm or more and 30 mm or less. Further, the substantially hexagonal structure 321 constituting the embossed pattern 32 preferably has a longitudinal dimension L3 of 20 mm or greater and 45 mm or less, and more preferably 30 mm or greater and 40 mm or less. Thereby, the diffusion path | route of the bodily fluid in the absorber 30 can be ensured, and it can be set as the absorbent article 1 with the favorable diffusibility of the bodily fluid in the absorber 30. FIG.

  Further, as shown in FIGS. 3 and 4, the honeycomb-shaped emboss pattern 32 of the substantially hexagonal structure 321 preferably has a concave peripheral edge 322 of the substantially hexagonal structure 321. The central part is preferably convex. Thereby, the diffusion path | route of the bodily fluid in the absorber 30 can be ensured in a concave shape part, and it can be set as the absorbent article 1 with the favorable diffusibility of the bodily fluid in the absorber 30. FIG.

  The distance between the substantially hexagonal structures 321 that is the width of the peripheral edge 322 in the honeycomb-shaped emboss pattern 32 of the approximately hexagonal structure 321 is preferably 7 mm or more and 50 mm or less, and more preferably 10 mm or more and 45 mm or less. preferable.

  As shown in FIGS. 3 and 4, the width of the pair of left and right slit portions 311 disposed in at least the upper absorber 301 of the absorber 30 with respect to the width W3 of the substantially hexagonal structure 321 constituting the embossed pattern 32. The slit interval D1 / emboss pattern width W3 × 100 (%), which is the ratio of the direction interval D1, is 70% or more and 150% or less, and preferably 85% or more and 130% or less. Thereby, it is set as the absorbent article 1 with a favorable absorption rate and diffusibility, and the repetition absorption rate by the synergistic effect of the favorable absorption rate by the slit part 31, and the favorable diffusibility by the embossing pattern 32. be able to.

  The substantially hexagonal structure 321 constituting the embossed pattern 32 may be other polygons such as a lattice structure and a diamond structure in addition to the substantially hexagonal structure, and the corners of the polygons are rounded or gently formed. It may be a round shape such as an acorn shape.

[Repeated absorption rate]
In the absorbent article 1 of the present invention, the total of the seven repetition absorption rates is preferably 200 seconds or less, and more preferably 185 seconds or less. Thereby, it can be set as the absorptive article 1 which was excellent not only in the absorption speed of a bodily fluid in absorber 30, but also in the repetition absorption speed of bodily fluid.

  The repeated absorption rate of the absorbent article 1 of the present invention is measured as follows.

  As shown in FIG. 5, the absorbent article 1 is stretched and fixed in a state where the absorbent article 1 is spread on a horizontal smooth surface, and an acrylic plate having a cylindrical portion for water injection is provided on the absorbent article 1. It mounts so that it may overlap with the crotch part in the absorber 30 of the absorbent article 1 in the thickness direction. The acrylic plate has a length of 140 mm and a width of 100 mm, and the water injection cylindrical portion has an inner diameter of 36 mm and an outer diameter of 40 mm. Two weights with a weight of 687 g are placed on the acrylic plate symmetrically in the length direction of the acrylic plate with the water injection cylindrical portion interposed therebetween. From the cylindrical portion, 150 mL of physiological saline is injected per time, and the time until the liquid surface is absorbed into the absorbent article 1 is measured (first time). Then, 150 mL of physiological saline is again injected after 3 minutes from the time when absorption is completed, and the time until absorption is similarly measured (second time), and 150 mL of physiological saline is again added after 3 minutes. Inject and measure the time to absorb similarly (third time). This is repeated 7 times, and the total time of 7 times is taken as the absorption rate.

[Liquid diffusion distance]
The absorbent article 1 of the present invention preferably has a liquid diffusion distance of 90% or more, and more preferably 94% or more after seven measurements of the repeated absorption rate. Thereby, it can be set as the absorbent article 1 excellent in the diffusibility of the body fluid in the absorber 30. FIG.

  The liquid diffusion distance of the absorbent article 1 of the present invention is measured as follows.

  The liquid diffusion distance of the absorbent article 1 of the present invention is the length (diffusion length) that the physiological saline spreads over the absorbent body 30 with respect to the full length of the absorbent body 30 after the measurement of the repeated absorption rate seven times. It is a ratio, and is expressed as diffusion length / absorber total length × 100 (%).

[Liquid return amount]
The liquid return amount of the absorbent article 1 of the present invention is preferably 6.5 g or less, and more preferably 5.5 g or less. Thereby, the absorber 30 which absorbed the body fluid can hold | maintain the absorbed body fluid favorably, and it can be set as the absorbent article 1 excellent in the liquid return amount.

  The liquid return amount of the absorbent article 1 of the present invention is measured as follows.

The absorbent article 1 is fixed in a state where the absorbent article 1 is spread on a horizontal smooth surface, 150 mL of physiological saline is injected into the central portion of the absorbent article 1, and a second injection of 150 mL of physiological saline is performed after 10 minutes. . After repeating the same injection operation seven times, a filter paper (ADVANTEC, No. 2 filter paper, diameter 55 mm) measured in advance was placed at the center of the injection part, and a 687 g weight was placed on the filter paper (pressure: 35 gf / cm ² ). One minute after placing the weight, the weight of the filter paper is measured, and the weight difference (g) of the filter paper before and after the test is taken as the liquid return amount. The measurement of the amount of liquid return is the average of those performed for N = 10 samples.

[Method of manufacturing absorbent article]
The manufacturing method of the absorbent article 1 can employ a well-known method. For example, (A) Absorbent fibers are stacked together with a superabsorbent polymer to create an absorbent mat, and the absorbent body 30 is formed. Step (B) In the collective drum, the top sheet 20 is disposed above the absorber 30, the back sheet is disposed below the absorber 30, and the respective structural members are fixed and integrated. (C) Absorbent article 1 The manufacturing method etc. which have the process of cutting the semi-finished product of this product with a product size with a cutter device, and separating each absorbent article 1 can be mentioned. And when shape | molding the absorber 30 of the absorbent article 1 in this invention, the predetermined | prescribed embossed pattern 32 is provided to the upper layer absorber 301 at least, and predetermined | prescribed to the crotch part of the upper layer absorber 301 and the lower layer absorber 302 is carried out. You may have the process of providing the slit part 31. FIG.

  Hereinafter, the present invention will be described in detail with reference to examples. In addition, this invention is not limited to the Example shown below at all.

<Example 1>
(Production of absorbent articles)
An upper absorbent mat was prepared in which 30 g of fluff pulp pulverized by pulp pulp and 10 g of superabsorbent polymer were piled together. The upper-layer absorbent mat is provided with a substantially hexagonal honeycomb-shaped emboss pattern in which the dimension in the width direction of the substantially hexagonal structure in the emboss pattern is 27 mm and the dimension in the longitudinal direction is 36 mm, and the upper-layer absorbent mat has a length of 550 mm. The upper absorbent body was cut into a width of 280 mm. Then, a pair of left and right slit portions having a width dimension of 15 mm and a longitudinal dimension of 140 mm were provided in the crotch portion of the upper absorber in a straight line in the longitudinal direction of the upper absorber. On the other hand, a lower layer absorbent mat prepared by stacking together 16 g of fluff pulp pulverized by pulp sheet and 10 g of superabsorbent polymer was prepared, and the lower layer absorbent mat was cut into a length of 550 mm and a width of 200 mm to absorb the lower layer. The body. And in the crotch part of the lower layer absorber, a pair of left and right slits having a width dimension of 15 mm and a longitudinal dimension of 140 mm were provided in a straight line in the longitudinal direction of the lower layer absorber. The upper absorbent article slit and the lower absorbent article slit are arranged and laminated so as to overlap in the thickness direction, and are laminated together with the top sheet and the back sheet, and the absorbent article has a length of 630 mm and a width of 320 mm. Was prepared as a sample of Example 1. Note that the top sheet, using a air-through nonwoven fabric (basis weight 18 g / ^{m 2),} the backsheet, with a breathable polyethylene film (basis weight 18g / ^{m 2).}

  The repeated absorption rate, diffusion distance and liquid return amount of the obtained absorbent article were measured as described above and evaluated according to the following. Moreover, stickiness was evaluated according to the following.

(Repeated absorption rate)
From the measurement results obtained according to the above-described measurement method, “◯” indicates that the total of the 7 repetition absorption rates is 200 seconds or less, “Δ” indicates that it is 201 seconds or more and 250 seconds or less, and “251” or more. When it was, it was set as "x".

(Liquid diffusion distance)
From the measurement results obtained according to the measurement method described above, when the liquid diffusion distance is 90% or more, “◯”, when it is 80% or more and 89% or less, “Δ”, and when it is 79% or less, “ × ”.

(Liquid return amount)
From the measurement results obtained according to the measurement method described above, when the liquid return amount is 6.0 g or less, “◯”, when 6.1 g or more and 8.0 g or less, “Δ”, when 8.1 g or more. It was set as “x”. In addition, it is an absorptive article which was excellent in absorption performance, so that liquid return amount was small.

(Stickiness)
Eight panelists made a sensory evaluation of the stickiness when wearing the absorbent article. After the absorbent article is mounted, 150 mL of physiological saline is injected into the vicinity of the urination port using a tube 7 times at 10-minute intervals, and after 1 hour after the completion of the seventh injection, A sensory evaluation of stickiness was performed based on the evaluation of “no”. Table 2 shows that “No stickiness” is rated 6 or more and 8 or less, “○”, “No stickiness” is rated 3 or more and 5 or less, “△”, When the evaluation of “no” was 1 or 2 or when there was no evaluation of “no stickiness”, “x” was assigned.

  The structure of the manufactured absorbent article of Example 1 is summarized in Table 1. The measurement results and evaluation of the repetitive absorption rate, liquid diffusion distance, liquid return amount, and stickiness of the absorbent article of Example 1 are summarized in Table 2. Moreover, about the repetition absorption rate of the absorbent article of Example 1, and the frequency | count of water injection, it put together in FIG.

<Comparative Example 1 and Comparative Example 2>
The manufacturing method of the absorbent article of Comparative Example 1 and Comparative Example 2 was prepared in the same manner as in Example 1, and the structure and the like of the absorbent body of each absorbent article in Comparative Example 1 and Comparative Example 2 are shown in Table 1. Moreover, measurement / evaluation of the repetitive absorption rate, liquid diffusion distance, liquid return amount, and stickiness of each absorbent article in Comparative Example 1 and Comparative Example 2 was carried out in the same manner as in Example 1, and the measurement results / evaluation obtained were evaluated. Is shown in Table 2. Moreover, about the repetition absorption rate and the frequency | count of water injection of each absorbent article in the comparative example 1 and the comparative example 2, it showed in FIG.

  As shown in Example 1, in an absorbent article in which a pair of left and right linear slits extending in the longitudinal direction of the absorber is provided in the crotch portion of the absorber at the substantially central portion in the width direction of the absorber, Slit spacing / embossing pattern width × 100 (%), which is the ratio of the spacing in the width direction of the pair of left and right slit portions arranged in the upper absorber to the dimension in the width direction of the substantially hexagonal structure constituting the pattern, By being 70% or more and 150% or less, the absorption rate and the diffusibility are good due to the synergistic effect of the good absorption rate by the slit portion and the good diffusibility by the emboss pattern, and the repetition absorption rate is also excellent. Furthermore, it was possible to obtain an absorbent article excellent in liquid return amount and stickiness.

  On the other hand, in Comparative Example 1 in which the slit interval / emboss pattern width × 100 (%) exceeds 150% and in Comparative Example 2 that is less than 70%, both the absorption speed by the slit portion and the diffusibility by the emboss pattern are compatible. In this case, the absorbent article was inferior in both repetitive absorption rate and diffusibility, and inferior in liquid return and stickiness.

DESCRIPTION OF SYMBOLS 1 Absorbent article 20 Top sheet 30 Absorber 301 Upper layer absorber 302 Lower layer absorber 31 Slit part 311 Slit part of upper layer absorber 312 Slit part of lower layer absorber 32 Embossed pattern 321 Substantially hexagonal structure 322 Peripheral part

Claims (7)

An absorbent article having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the top sheet and the back sheet,
The absorbent body has an abdominal side part, a back side part, and a crotch part between the abdominal side part and the back side part, and is positioned on the skin contact surface side and on the non-skin contact surface side. Consists of two layers of lower layer absorber
At least the crotch portion of the absorber is provided with two pair of left and right linear slit portions extending in the longitudinal direction of the absorber at a substantially central portion in the width direction of the absorber,
The slit part does not include fluff pulp and superabsorbent polymer,
The pair of left and right slit portions of the upper layer absorber and the pair of left and right slit portions of the lower layer absorber corresponding to the upper layer absorber in the thickness direction at least partially overlap in the thickness direction of the absorber. And place
At least the upper layer absorber of the absorber is provided with a substantially hexagonal honeycomb-shaped emboss pattern,
Slit spacing / embossing, which is the ratio of the spacing in the width direction of the pair of left and right slits arranged in at least the upper absorber of the absorber to the dimension in the width direction of the substantially hexagonal structure constituting the emboss pattern The absorbent article whose pattern width x100 (%) is 70% or more and 150% or less.   In the upper absorbent body, the ratio of the fluff pulp weight to the weight of the superabsorbent polymer / the weight of the fluff pulp / the weight of the superabsorbent polymer × 100 (%) is 240% or more and 320% or less. The absorbent article according to claim 1, wherein in the lower layer absorbent body, the ratio (%) of the fluff pulp weight to the weight of the superabsorbent polymer is 150% or more and 200% or less. Each slit part of the upper layer absorber and the lower layer absorber has a dimension in the longitudinal direction of 20% or more and 50% or less with respect to the total length in the longitudinal direction of the upper layer absorber or the lower layer absorber. The dimension is 2% or more and 6% or less with respect to the longest width in the width direction of the upper layer absorber or the lower layer absorber,
The slit interval which is the interval in the width direction of each slit portion of the upper layer absorber and the lower layer absorber is 3% or more and 15% or less with respect to the longest width in the width direction of the upper layer absorber or the lower layer absorber. The absorbent article according to claim 1 or 2.   The absorptive article according to any one of claims 1 to 3 with which each dimension of the width direction of the slit part of said lower layer absorber is wider than each dimension of the slit part of said upper layer absorber.   The absorptivity according to any one of claims 1 to 4, wherein the substantially hexagonal structure constituting the embossed pattern has a width dimension of 10 mm to 40 mm and a longitudinal dimension of 20 mm to 45 mm. Goods.   The absorptive article according to any one of claims 1 to 5 whose total of seven repetition absorption speeds is 200 seconds or less.   The absorptive article according to claim 6 whose liquid diffusion distance after seven times of repetition absorption rates is 90% or more.

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