JP6720444B2 - Absorbent article - Google Patents

Description

The present invention relates to an absorbent article having a high absorption rate and a small amount of reversion.

In general, adult paper diapers include tape-fastening type, urine absorbing pad, pants type and the like, and these paper diapers are appropriately selected and used according to the necessity of care for excretion of the wearer. These absorbent articles are composed of a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber arranged between the two sheets. By adopting such a configuration, body fluid such as urine permeates the top sheet of the absorbent article and is absorbed by the absorber, and is prevented from leaking to the outside by the back sheet.

Here, it is said that two important points regarding the absorption performance of the absorbent article are (1) a high absorption rate and (2) a small amount of reversion. In order to improve these two performances, for example, technologies such as devising the structure of the absorber and the blending mode of the superabsorbent polymer, providing embossing on the absorber, and forming slits in the top sheet have been proposed. Are known. However, in general, it has been conventionally pointed out that it is difficult to maximize the above two performances at the same time, and when one performance is improved, the other performance is degraded.

For example, if you want to minimize the amount of reversion in absorbent articles, use a method such as adding a large amount of superabsorbent polymer to the absorber or adjusting the position of the superabsorbent polymer to the topsheet side. However, as a reaction to this, it is known that a gel block is generated by the superabsorbent polymer and the absorption rate is reduced. On the contrary, when it is desired to increase the absorption rate in the absorbent article, a method such as increasing the amount of fluff pulp or arranging a liquid diffusion sheet can be adopted. It has been known that the amount of reversion of the item increases. Furthermore, by increasing both the amount of superabsorbent polymer and fluff pulp, it is possible to improve both the increase in absorption rate and the suppression of the amount of reversion to a certain extent, but to increase the amount of various materials used. As a result, the cost may increase.

On the other hand, the following patent documents disclose a technique for improving the absorption performance of an absorbent article by providing slits or openings in the top sheet or the second sheet.

For example, in Patent Document 1, a surface sheet that is disposed at least on the body side surface side and is formed by adhering a top sheet and a mesh sheet having a plurality of openings, and a back sheet disposed on the outer surface side. And an absorbent article including an absorbent body interposed between both sheets. In addition, Patent Document 2 has a top sheet, a back sheet, and an absorber arranged between them, and a second sheet is arranged between the top sheet and the absorber, and the second sheet is a top sheet. Disclosed is an absorbent article comprising a laminate having a non-woven fabric layer and a plastic film layer from the sheet side and having a plurality of through holes formed therein.

JP, 2006-149457, A JP, 2016-019616, A

However, in any of the above absorbent articles, it is not possible to simultaneously and sufficiently improve the two performances of increasing the absorption rate and reducing the amount of reversion. Furthermore, when a bulky non-woven fabric is used to provide softness and cushioning to the top sheet and the second sheet that make up these absorbent articles, the absorbed body fluid remains in the thickness direction of the top sheet and the second sheet. There is also a concern that this will lead to liquid return.

Therefore, the present invention has been made in view of the above problems, and provides an absorbent article in which the absorption rate is increased, the amount of reversion is reduced, and the bodily fluid absorbed in the topsheet is unlikely to remain. The purpose is to

The inventor of the present invention has conducted diligent research in view of the above problems. As a result, in an absorbent article having a top sheet, a back sheet, and an absorber, the top sheet is composed of at least two liquid-permeable nonwoven fabric sheets, and each nonwoven fabric sheet is provided with a predetermined slit. The inventors have found that the above problems can be solved by configuring the slits provided in each of the upper and lower nonwoven fabric sheets so as not to overlap in the vertical direction, and have completed the present invention. Specifically, the present invention provides the following.

(1) A first aspect of the present invention is an absorbent article having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber arranged between the top sheet and the back sheet. The article, wherein the top sheet is composed of at least two liquid-permeable nonwoven fabric sheets, and the nonwoven fabric sheet of the body-side uppermost layer penetrates the nonwoven fabric sheet along the longitudinal direction of the absorbent article. Linear slits A are intermittently provided , and the slits A have intermittent portions A regularly between the slits A and other slits A on the same straight line, and each slit has a linear shape. Each of the intermittent portions A of the slit A is located on a straight line along the width direction of the absorbent article , and the non-woven fabric sheet located in the lower layer has the non-woven fabric sheet along the width direction of the absorbent article. Linear slits B penetrating through are intermittently provided , and the slits B regularly have intermittent portions B between the slits B and the other slits B on the same straight line. each the intermediate region B of the linear slit B, located on a straight line along the longitudinal direction of the absorbent article, the slits a and the slit B provided on the respective nonwoven fabric sheets stacked vertically, It does not overlap at all in the up-down direction, is composed of a combination of the slit A in the longitudinal direction and the slit B in the width direction, is not stretched in the vertical direction and does not have an elliptical shape, and the body-side uppermost nonwoven fabric sheet and the The absorbent article has no liquid passage holes penetrating the lower nonwoven fabric sheet .

(2) A second aspect of the present invention is the absorbent article according to (1), in which, among the laminated nonwoven fabric sheets, the slit of the nonwoven fabric sheet of the body-side uppermost layer has a length of 5 mm or more and 40 mm or more. The slits adjacent to each other in the longitudinal direction are spaced at intervals of 5 mm to 40 mm, and the slits adjacent to each other in the width direction are spaced from each other at intervals of 5 mm to 40 mm.

(3) A third aspect of the present invention is the absorbent article according to (1) or (2), in which the slits of the nonwoven fabric sheet located in the lower layer among the laminated nonwoven fabric sheets have a length of It is 3 mm or more and 25 mm or less, and the slits adjacent to each other in the width direction are separated by an interval of 5 mm or more and 25 mm or less, and the slits adjacent to each other in the longitudinal direction are separated by an interval of 5 mm or more and 35 mm or less. Is.

(4) A fourth aspect of the present invention is the absorbent article according to any one of (1) to (3), wherein the slits provided in the laminated nonwoven fabric sheet have a width of 0.5 mm or more and 2 or more. It is characterized by being less than 0.5 mm.

(5) A fifth aspect of the present invention is the absorbent article according to any one of (1) to (4), wherein the nonwoven fabric sheet located in the lower layer has a basis weight of the laminated nonwoven fabric sheets. , 18 g/m ² or more and 40 g/m ² or less, and the basis weight of the nonwoven fabric sheet located in the uppermost layer on the body side is 13 g/m ² or more and 30 g/m ² or less.

(6) A sixth aspect of the present invention is the absorbent article according to any one of (1) to (5), wherein the nonwoven fabric sheet located in the lower layer has a basis weight of the laminated nonwoven fabric sheets. It is characterized by being higher than the basis weight of the nonwoven fabric sheet of the uppermost layer on the body side.

(7) A seventh aspect of the present invention is the absorbent article according to any one of (1) to (6), wherein the non-woven fabric sheet forming the top sheet is an air-through non-woven fabric. It is a thing.

In the absorbent article of the present invention, since the top sheet is composed of at least two liquid-permeable nonwoven fabric sheets, the two nonwoven fabric sheets block liquid return from the absorbent body and reduce the amount of reversion. You can Further, in the absorbent article of the present invention, since the nonwoven fabric sheet is provided with slits, the absorbent body can absorb the body fluid through the slits. Therefore, the absorption rate of body fluid can be increased and the body fluid can be prevented from remaining on the nonwoven fabric sheet.

It is drawing which shows the aspect at the time of laminating|stacking the nonwoven fabric sheet of the body side uppermost layer and the nonwoven fabric sheet located in a lower layer, and making it a top sheet. It is drawing which shows the dimension of the slit provided in a nonwoven fabric sheet.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. In the embodiments described below, the same members are designated by the same reference numerals.

<Absorptive article>
In the description of the present specification, wearing the absorbent article 1 refers to at least one of wearing the absorbent article 1 and wearing the absorbent article 1. The longitudinal direction of the absorbent article 1 is a direction extending in front of and behind the wearer when the absorbent article 1 is worn, and is a direction indicated by a symbol Y in the drawing. Moreover, the width direction of the absorbent article 1 is a direction which is lateral or orthogonal to the longitudinal direction, and is a direction indicated by a symbol X in the drawing. Further, the body-side surface is a surface of both sides of each member such as an absorber that is arranged on the wearer's skin side when worn, and the clothing-side surface is both the front and back sides of each member such as the absorber. Of these, the surface is directed toward the side opposite to the wearer's skin side when worn. The body fluid refers to a fluid such as urine, blood, and water in loose stool discharged from the body to the outside of the body. Furthermore, the use of the absorbent article 1 is not particularly limited, and generally, regardless of whether it is for infants or adults, a tape-fastened disposable diaper, a pants-type disposable diaper, a urine absorbing pad, a light incontinence pad. , Sanitary goods, etc. may be used.

The absorbent article 1 includes a liquid-permeable topsheet 21 arranged on the body-side surface, a liquid-impermeable backsheet arranged to face the topsheet 21, and a space between the topsheet 21 and the backsheet. And an absorber arranged in at least one layer.

Further, in the absorbent article 1, in order to prevent lateral leakage of the body fluid excreted by the user, elastic members for three-dimensional gathers are provided along the longitudinal direction of the absorbent article 1 at both widthwise end portions on the top sheet 21. It may be provided with a pair of three-dimensional gathers having. The outer end of the three-dimensional gather in the width direction of the absorbent article 1 is fixed to the backsheet, the inner end thereof is fixed to the topsheet 21, and the center thereof is a free end that is not fixed to the topsheet 21. Sheets are arranged. By providing the elastic member for three-dimensional gathers along the longitudinal direction, the three-dimensional gathers have uprightness and can be deformed according to the wearer's body shape. As the elastic member for three-dimensional gather, for example, a polyurethane thread, a strip-shaped polyurethane film, a thread-shaped or strip-shaped natural rubber, etc. are used, and as the three-dimensional gather sheet, a water-repellent or liquid-impermeable material formed of hydrophobic fibers. Non-woven fabrics such as spun bond non-woven fabrics, melt blown non-woven fabrics, and composite non-woven fabrics obtained by laminating spun bond/melt blown/spun bond are used.

[Top sheet]
The top sheet 21 may be formed from a base material having liquid permeability that allows body fluid to move to the absorbent body. For example, a nonwoven fabric such as an air-through nonwoven fabric, a thermal bond nonwoven fabric, a spunbond nonwoven fabric, or a thermal bond/spunbond. It is formed from a composite nonwoven fabric or the like in which Further, the top sheet 21 may be embossed or perforated on its surface in order to improve liquid permeability. As a method for performing these embossing processing and perforating processing, known methods can be carried out without limitation. Further, in order to reduce irritation to the skin, the top sheet 21 may contain a lotion, an antioxidant, an anti-inflammatory component, a pH adjusting agent, an antibacterial agent, a moisturizing agent and the like. Further, from the viewpoint of strength and workability, it is preferable that the basis weight of one nonwoven fabric constituting the top sheet 21 is 13 g/m ² or more and 50 g/m ² or less. The shape of the top sheet 21 is not particularly limited, but may be any shape as long as it covers the absorber so as to guide the body fluid to the absorber so that there is no leakage.

FIG. 1 is a diagram showing a mode in which a top sheet 21 is formed by laminating a body-side uppermost non-woven sheet 212 and a lower-layer non-woven sheet 213. In the absorbent article 1 of the present invention, the top sheet 21 is composed of at least two nonwoven fabric sheets. The number of non-woven fabric sheets forming the top sheet 21 is preferably 2 or more and 4 or less, and more preferably 2 or more and 3 or less. Further, as a combination of two or more non-woven fabric sheets forming the top sheet 21, non-woven fabric sheets of the same type may be used in combination, or non-woven fabric sheets of different types may be used in combination. The non-woven fabric sheet forming the top sheet 21 is preferably a non-woven fabric sheet made of an air-through non-woven fabric. Regarding the grammage of the two non-woven sheets forming the top sheet 21, it is preferable that the grammage of the non-woven fabric sheet 213 located in the lower layer is higher than the grammage of the non-woven fabric sheet 212 of the body-side uppermost layer, and the body-side uppermost layer. The basis weight of the nonwoven fabric sheet 212 is preferably 13 g/m ² or more and 30 g/m ² or less, and the basis weight of the nonwoven fabric sheet 213 located in the lower layer is 18 g/m ² or more and 40 g/m ² or less. Is preferred.

(slit)
In the absorbent article 1 of the present invention, among the nonwoven fabric sheets constituting the top sheet 21, a linear shape penetrating the nonwoven fabric sheet 212 along the longitudinal direction of the absorbent article 1 in the body-side uppermost nonwoven fabric sheet 212. Slits A 214 are intermittently provided, and linear slits B 215 penetrating the nonwoven fabric sheet 213 are intermittently provided in the lower nonwoven fabric sheet 213 along the width direction of the absorbent article 1. ing. The slits A 214 and the slits B 215 provided on each of the at least two non-woven fabric sheets 212 , 213 that are stacked one above the other do not overlap in the vertical direction. By providing the slits A 214 and the slits B 215 on the non-woven sheets 212 and 213 , the body fluid excreted on the top sheet 21 is absorbed by the absorbent body through the slits A 214 and the slits B 215 , so that the body fluids are quickly absorbed. It is also possible to prevent the body fluid from remaining inside the non-woven fabric sheet while ensuring the absorption rate and increasing the absorption rate.

In the present invention, the slits A 214 provided in the body-side uppermost nonwoven fabric sheet 212 are preferably linearly and intermittently arranged along the longitudinal direction, and the slits A 214 are provided in the lower nonwoven fabric sheet 213. It is preferable that the provided slits B215 are arranged linearly and intermittently along the width direction. By arranging the slits A 214 and the slits B 215 provided on the nonwoven fabric sheets 212 and 213 linearly and intermittently, the slits A 214 and the slits B 215 can be evenly distributed on the nonwoven fabric sheet, and the slits A 214 and the slits B 215 are vertically The structure in which the slits A214 and the slits B215 of the laminated nonwoven fabric sheets do not overlap each other can be easily realized without cost.

FIG. 2 is a drawing showing the dimensions of the slit A 214 and the slit B 215 provided in the nonwoven fabric sheet. In the present invention, of the laminated nonwoven fabric sheets 212 , 213 , the length of the slit A 214 of the uppermost nonwoven fabric sheet 212 on the body side is preferably 5 mm or more and 40 mm or less per slit A 214. More preferably, it is 20 mm or less. Further, the slits A 214 adjacent to each other in the longitudinal direction are preferably separated from each other at an interval of 5 mm or more and 40 mm or less, more preferably at an interval of 10 mm or more and 25 mm or less. Further, the slits A 214 that are adjacent to each other in the width direction are preferably separated from each other at an interval of 5 mm or more and 40 mm or less, and more preferably at an interval of 10 mm or more and 25 mm or less. The width of the slit A 214 is preferably 0.5 mm or more and 2.5 mm or less, and more preferably 1.0 mm or more and 2.0 mm or less. By setting the dimension of the slit A 214 of the body-side uppermost non-woven sheet 212 within the above range, it is possible to reduce the amount of body fluid remaining in the non-woven sheet while ensuring rapid absorption of body fluid. it can.

In addition, the length of the slit B215 of the nonwoven fabric sheet 213 located in the lower layer of the laminated nonwoven fabric sheets 212 , 213 is preferably 3 mm or more and 25 mm or less per slit B215 , and is 10 mm or more and 20 mm or less. Is more preferable. Further, the slits B215 adjacent to each other in the width direction are preferably separated from each other at an interval of 5 mm or more and 25 mm or less, and more preferably are separated from each other at an interval of 15 mm or more and 25 mm or less. Further, the slits B215 adjacent to each other in the longitudinal direction are preferably spaced at intervals of 5 mm or more and 35 mm or less, and more preferably at intervals of 10 mm or more and 25 mm or less. The width of the slit B215 is preferably 0.5 mm or more and 2.5 mm or less, and more preferably 1.0 mm or more and 2.0 mm or less. By setting the size of the slit B215 of the lower nonwoven fabric sheet 213 within the above range, it is possible to reduce the amount of body fluid remaining in the nonwoven sheet while ensuring rapid absorption of body fluid.

[Backsheet]
The back sheet may be formed using a substrate having a liquid impermeable property such that the body fluid held by the absorber does not wet clothes, and a resin film or a composite sheet in which a resin film and a nonwoven fabric are laminated. Is formed from a material such as. The nonwoven fabric used for the composite sheet is not particularly limited in its production method, and examples thereof include spunbonded nonwoven fabrics, meltblown nonwoven fabrics, composite nonwoven fabrics 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, a composite film of polyethylene and polypropylene, and the like.

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. Further, in order to prevent stuffiness during mounting, it is preferable that the back sheet has breathability. In order to provide the back sheet with air permeability, for example, a resin film as a base material may be mixed with a filler, or the back sheet may be embossed. As the filler, calcium carbonate can be mentioned, and as a compounding method thereof, a known method can be used without limitation.

[Absorber]
The absorber preferably contains an absorbent fiber as a base material and a super absorbent polymer (SAP). The absorbent fiber is not particularly limited as long as it is generally used for absorbent articles such as sanitary napkins, disposable diapers, and urine absorbing pads, and examples thereof include fluff pulp, cotton, rayon, acetate, tissue, absorbent paper, hydrophilic. A non-woven fabric can be used. Among these, fluff pulp is preferably used from the viewpoint of absorbability. Examples of such fluff pulp include wood pulp, synthetic fibers, polymer fibers, non-wood pulp and the like defibrated into cotton. The absorbent fiber of the absorbent body preferably has a basis weight of 100 g/m ² or more and 800 g/m ² or less so as not to impair the absorption performance and the touch.

The superabsorbent polymer of the absorbent body is not particularly limited as long as it can absorb body fluid and can prevent backflow. Sodium polyacrylate-based, polyaspartate-based, (starch-acrylic acid) graft copolymers can be used. Those formed from materials such as polymers, (acrylic acid-vinyl alcohol) copolymers, (isobutylene-maleic anhydride) copolymers and saponified products thereof can be used. Among these, from the viewpoint of the amount absorbed per weight, sodium polyacrylate type is preferable. The SAP amount of the absorber is preferably a basis weight of 50 g/m ² or more and 500 g/m ² or less, and a content of 15% by mass or more and 60% by mass or less so as not to impair the absorption performance and the touch. preferable.

In the absorbent body, the form of the absorbent fiber and the SAP is preferably formed by mixing SAP particles in the absorbent fiber or an SAP sheet in which 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, it is preferable to wrap the absorber in a carrier sheet. The base material of the carrier sheet may be any one having hydrophilicity, and examples thereof include hydrophilic non-woven fabric such as tissue, absorbent paper, and air-laid non-woven fabric. When a plurality of carrier sheets are provided, the base materials of the carrier sheets may be the same or different.

The absorber is preferably a laminate of an upper layer absorber and a lower layer absorber. In this case, the length in the longitudinal direction and the width direction of the upper layer absorbent body and the lower layer absorbent body, the length of the upper layer absorbent body may be longer than the length of the lower layer absorbent body, the length of the upper layer absorbent body of the lower layer absorbent body. It may be the same as the length, or the length of the upper absorbent body may be shorter than the length of the lower absorbent body.

The absorbent article 1 of the present invention may have, in addition to the absorber, a SAP sheet in which two non-woven fabric sheets sandwich a superabsorbent polymer. By using such an SAP sheet, the absorbent performance of the absorbent article 1 can be further improved.

<Method of manufacturing absorbent article>
A well-known method can be adopted as a method for manufacturing the absorbent article 1. For example, (A) a step of stacking absorbent fibers together with a superabsorbent polymer to form an absorbent mat, and forming an absorbent body. , (B) a step of fixing and integrating the top sheet 21 and the solid gather with a hot melt adhesive, and (C) a step of applying the hot melt adhesive to the inside of the top sheet 21, the solid gather, and the back sheet. , (D) In the collecting drum, the step of disposing the topsheet 21 on the upper part of the absorber and the backsheet on the lower part of the absorber to fix and integrate the respective constituent members, (E) Semi-finished product of the absorbent article 1 Can be mentioned as a manufacturing method including a step of cutting the absorbent article 1 into individual pieces with a cutter device and cutting the individual absorbent articles 1. Then, in the present invention, prior to laminating the top sheet 21 with the absorber, the nonwoven fabric sheet having the slits 214 may be laminated at a predetermined position with an arbitrary cutter or the like and used as the top sheet 21.

Hereinafter, the present invention will be described in detail with reference to examples. The present invention is not limited to the examples described below.

<Example 1>
(Preparation of absorber)
An absorbent mat in which 6 g of fluff pulp obtained by crushing and disintegrating a pulp sheet and 7 g of a superabsorbent polymer were stacked was prepared and cut into a length of 330 mm and a width of 105 mm. This absorbent body was laminated with a top sheet and a back sheet, and a pair of lateral leak preventing solid gathers were formed to produce an absorbent article having a length of 400 mm and a width of 320 mm, which was used as a sample of Example 1. Among the non-woven sheets that form the top sheet, the body-side uppermost non-woven sheet (air-through non-woven fabric) has a basis weight of 18 g/m ² , and the lower-layer non-woven sheet (air-through non-woven fabric) has a basis weight of 20 g. /M ² , the slits having a length of 10 mm along the longitudinal direction on the uppermost nonwoven fabric sheet on the body side, so that the adjacent slits have a longitudinal interval of 10 mm and a widthwise interval of 20 mm. A slit having a length of 10 mm was formed along the width direction on the non-woven fabric sheet located in the lower layer so that the space between adjacent slits in the width direction was 10 mm and the space in the longitudinal direction was 10 mm. A breathable polyethylene film (basis weight: 18 g/m ² ) was used as the back sheet. The absorption rate and the liquid return amount of the obtained absorbent article were measured and evaluated according to the following.

(Absorption rate)
A hole having an inner diameter of 30 mm is opened in the center of a cylinder having an outer diameter of 80 mm, and a measuring jig having a weight of 2000 g is placed in a state where the top sheet is directed upward, and a central portion in the longitudinal direction and the width direction of the absorbent article. 40 ml of physiological saline (temperature 36±3° C.) is dropped from the hole on the top, and the physiological saline is applied to the circumference of the center circle of the measuring jig from the time when the physiological saline comes into contact with the absorbent article. Was measured as the absorption speed by terminating the time until it was completely inhaled. After the physiological saline was completely absorbed by the absorbent article, the absorbent article was allowed to stand for 3 minutes and the same absorption test was repeated 3 times in total.

(Liquid return amount)
300 ml of physiological saline (temperature 36±3° C.) was injected into the center of the absorbent article, and after 10 minutes, 10 pieces of filter paper (No. 2 filter paper manufactured by ADVANTEC, diameter 55 mm) whose weight was measured in advance were placed in the injection part. It was placed in the center, and an acrylic plate and a weight were placed on the filter paper (pressure; 35 gf/cm ² ). Ten minutes after the weight was placed, the weight of the filter paper was measured, and the weight difference (g) between the filter paper before and after the test was used as the liquid return amount. The liquid return amount was an average value of those performed for N=10 samples. The smaller the amount of liquid returned, the better the absorption performance.

(Comprehensive judgment)
◯: Absorption rate is fast and the amount of reversion is small Δ: Absorption rate is low and the amount of reversion is large

<Example 2>
A slit having a length of 20 mm is formed on the uppermost nonwoven fabric sheet on the body side so that the adjacent slits have a longitudinal gap of 20 mm and a widthwise gap of 35 mm. An absorbent article was produced in the same manner as in Example 1 except that the slits each having a length of 20 mm were formed so that the adjacent slits had an interval in the longitudinal direction of 20 mm and an interval in the width direction of 20 mm.

<Comparative Example 1>
No slit is formed in the uppermost nonwoven fabric sheet on the body side, and a slit having a length of 10 mm is formed in the lower nonwoven fabric sheet so that adjacent slits have a longitudinal interval of 15 mm and a widthwise interval of 2 mm. An absorbent article was produced in the same manner as in Example 1 except that the absorbent article was formed.

<Comparative example 2>
An absorbent article was produced in the same manner as in Example 1 except that the top sheet was not provided with any slits.

The above results are shown in Table 1.

As shown in Table 1, in the absorbent articles of Examples 1 and 2, the nonwoven fabric sheet forming the top sheet had a large number of slits, and thus the absorption rate was increased. Further, since the slits are formed, the water retention capacity of the non-woven sheet is reduced, and the slits are provided in the non-woven sheet laminated above and below to allow bodily fluid to seep out from the absorbent body. Since it has decreased, the amount of reversion also decreased. The numerical values for the absorption rate and the amount of reversion of Examples 1 and 2 are significantly improved as compared with Comparative Example 1 in which the nonwoven fabric sheet of the uppermost layer on the body side is not provided with slits or Comparative Example 2 in which no slit is provided. It became a thing. From these results, it was found that the present invention can provide an absorbent article in which the absorption rate is increased, the amount of reversion is reduced, and the bodily fluid absorbed in the topsheet is unlikely to remain.

DESCRIPTION OF SYMBOLS 1 Absorbent article 21 Top sheet 212 The nonwoven fabric sheet of the body side uppermost layer 213 The nonwoven fabric sheet located in the lower layer 214 Slit A
215 slit B
Y Longitudinal direction X Width direction

Claims (7)

A liquid-permeable topsheet, a liquid-impermeable backsheet, and an absorbent article having an absorber disposed between the topsheet and the backsheet,
The topsheet is composed of at least two liquid-permeable nonwoven sheets,
A linear slit A penetrating the nonwoven fabric sheet is intermittently provided along the longitudinal direction of the absorbent article in the nonwoven fabric sheet of the body-side uppermost layer, and the slit A is defined by the slit A and the slit A. The intermittent portions A are regularly arranged between the other slits A on the same straight line, and each of the intermittent portions A of each linear slit A is linear along the width direction of the absorbent article. Located ,
A linear slit B penetrating the nonwoven fabric sheet is intermittently provided along the width direction of the absorbent article in the nonwoven fabric sheet located in the lower layer, and the slit B is the same as the slit B. Intermittent portions B are regularly provided between the slits B and other linear slits B, and each of the intermittent portions B of each linear slit B is located on a straight line along the longitudinal direction of the absorbent article. Then
The slit A and the slit B provided on the respective nonwoven fabric sheets stacked vertically becomes completely overlapped in the vertical direction Orazu, the combination of the slit B of the slit A and the width direction of the longitudinal, vertical Is not stretched to an elliptical shape,
An absorbent article having no liquid passage holes penetrating the non-woven fabric sheet on the uppermost layer on the body side and the non-woven fabric sheet located on the lower layer . Of the stacked the nonwoven fabric sheet, the slits A nonwoven sheet bodyside uppermost layer, is not less 5mm or more 40mm or less in length, the slit A adjacent longitudinally spaced apart at 40mm intervals of less than 5mm or more The absorbent article according to claim 1, wherein the slits A that are adjacent to each other in the width direction are separated by an interval of 5 mm or more and 40 mm or less. Of the stacked the nonwoven fabric sheet, the slits B of the nonwoven fabric sheet is located in the lower layer is 25mm or less is 3mm or more in length, are spaced at 25mm intervals of less than 5mm or more said slit B adjacent to each other in the width direction, The absorbent article according to claim 1 or 2, wherein the slits B adjacent to each other in the longitudinal direction are separated by an interval of 5 mm or more and 35 mm or less. The absorbent article according to any one of claims 1 to 3, wherein the slits A and the slits B provided on the laminated nonwoven fabric sheets have a width of 0.5 mm or more and 2.5 mm or less. Among the laminated non-woven sheets, the basis weight of the non-woven sheet positioned in the lower layer is 18 g/m ² or more and 40 g/m ² or less, and the basis weight of the non-woven sheet positioned in the uppermost layer on the body side is 13 g/m ^2. The absorbent article according to any one of claims 1 to 4, which is 30 g/m ² or less. The absorbent article according to any one of claims 1 to 5, wherein a basis weight of the nonwoven fabric sheet located in the lower layer of the laminated nonwoven fabric sheets is higher than a basis weight of the nonwoven fabric sheet of the body-side uppermost layer. The absorbent article according to any one of claims 1 to 6, wherein the non-woven fabric sheet forming the top sheet is an air-through non-woven fabric.

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