JP2017176329A - Absorbent articles - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article in which an absorption rate is increased, an amount of reversion is reduced, and a body fluid absorbed in a top sheet is unlikely to remain. An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber arranged between the top sheets and the back sheets, wherein the top sheet is at least. It is composed of two liquid-permeable non-woven fabric sheets, and the non-woven fabric sheet is intermittently provided with linear slits penetrating the non-woven fabric sheet along the longitudinal direction of the absorbent article, and is laminated vertically. The slits provided in each of the above are absorbent articles that do not overlap in the vertical direction. [Selection diagram] Fig. 1

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 a tape stop type, a urine picking pad, a pants type, and the like, and these paper diapers are appropriately selected and used according to the need for care in excretion of the wearer. These absorbent articles are composed of a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between the two sheets. By adopting such a configuration, body fluid such as urine passes through the top sheet of the absorbent article and is absorbed by the absorbent body, and does not leak to the outside by the back sheet.

  Here, regarding the absorbent performance of the absorbent article, it is said that two points are important: (1) a high absorption rate and (2) a small amount of reversion. In order to improve these two performances, for example, there are techniques such as adding a device to the structure of the absorber and the blending mode of the superabsorbent polymer, providing an emboss on the absorber, and slitting the top sheet. Are known. However, in general, it has been pointed out that it is difficult to maximize the above two performances at the same time, and when one of the performances is improved, the performance of the other is lowered.

  For example, if you want to minimize the amount of reversal 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 top sheet side. However, it is known that as a reaction, a gel block due to the superabsorbent polymer is generated and the absorption rate is lowered. On the contrary, in the absorbent article, when it is desired to increase the absorption rate, 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 reversal increases. Furthermore, by increasing both the amount of the superabsorbent polymer and fluff pulp, it is possible to improve both the increase in the absorption rate and the suppression of the return amount to some extent. Along with this, there was a risk of high costs.

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

  For example, Patent Document 1 discloses that a surface sheet is formed by adhering a mesh sheet having a top sheet and a plurality of openings, and a back sheet disposed on the outer surface side. And the absorbent article comprised by the absorber interposed between both sheets is disclosed. Further, Patent Document 2 includes a top sheet, a back sheet, and an absorbent body disposed between them, and a second sheet is disposed between the top sheet and the absorbent body. An absorbent article comprising a laminate having a nonwoven fabric layer and a plastic film layer from the sheet side and having a plurality of through holes is disclosed.

JP 2006-149457 A JP 2006-019616 A

  However, none of the above absorbent articles can simultaneously and sufficiently improve the two performances of increasing the absorption rate and reducing the amount of reversion. Furthermore, when a bulky nonwoven fabric is used for the top sheet or the second sheet constituting these absorbent articles to provide a touch or cushioning property, the absorbed body fluid remains in the thickness direction of the top sheet or 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 absorbed body fluid does not easily remain in the top sheet. For the purpose.

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

  (1) A first aspect of the present invention is an absorbent 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 top sheet is composed of at least two liquid-permeable nonwoven sheets, and the nonwoven sheet has a linear shape that penetrates the nonwoven sheet along the longitudinal direction of the absorbent article. Slits are provided intermittently, and the slits provided in each of the nonwoven fabric sheets laminated vertically are absorbent articles that do not overlap in the vertical direction.

  (2) The second aspect of the present invention is the absorbent article according to (1), wherein among the laminated nonwoven fabric sheets, the slit of the nonwoven fabric sheet of the body layer uppermost layer has a length of 5 mm or more and 30 mm. The slits adjacent to each other in the longitudinal direction are separated by an interval of 5 mm or more and 50 mm or less.

  (3) A third aspect of the present invention is the absorbent article according to (1) or (2), wherein, among the laminated nonwoven fabric sheets, the slit of the nonwoven fabric sheet located in the lower layer has a length. 5 mm or more and 30 mm or less, slits adjacent in the longitudinal direction are spaced apart by an interval of 5 mm or more and 50 mm or less, and in a state where at least two nonwoven fabric sheets are laminated, the slit of the nonwoven fabric sheet of the body layer uppermost layer, The slits of the nonwoven fabric sheet located in the lower layer are characterized by being spaced apart by 2 mm or more and 15 mm or less in the width direction.

  (4) A fourth aspect of the present invention is the absorbent article according to any one of (1) to (3), wherein the width of the slit provided in the laminated nonwoven fabric sheet is 0.5 mm or more and 2 It is characterized by being 5 mm or less.

(5) The fifth aspect of the present invention is the absorbent article according to any one of (1) to (4), wherein the basis weight of the nonwoven fabric sheet positioned in the lower layer is laminated among the laminated nonwoven fabric sheets. , 18 g / ^{m 2} or more 40 g / ^{m 2} or less, the basis weight of the nonwoven sheet positioned on the bodyside top layer, is characterized in that it is 13 g / ^{m 2} or more 30 g / ^{m 2} or less.

  (6) The sixth aspect of the present invention is the absorbent article according to any one of (1) to (5), wherein the basis weight of the nonwoven fabric sheet positioned in the lower layer is laminated among the laminated nonwoven fabric sheets. The basis weight of the nonwoven fabric sheet on the body side uppermost layer is higher.

  (7) A seventh aspect of the present invention is the absorbent article according to any one of (1) to (6), wherein the nonwoven fabric sheet constituting the top sheet is an air-through nonwoven fabric. Is.

  In the absorbent article of the present invention, the top sheet is composed of at least two liquid-permeable nonwoven sheets, so that the liquid return from the absorber is blocked by the two nonwoven sheets, and the amount of return is reduced. Can do. Moreover, since the absorbent article of this invention provided the slit in the nonwoven fabric sheet, a bodily fluid can be absorbed into an absorber through this slit. For this reason, while being able to increase the absorption rate of a bodily fluid, it can prevent that a bodily fluid remains in a 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 to make 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 denoted by the same reference numerals.

<Absorbent article>
In the description of the present specification, the time when the absorbent article 1 is worn means at least one of the time when the absorbent article 1 is attached and after the attachment. 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 body side surface is a surface arranged on the skin side of the wearer at the time of wearing among the front and back surfaces of each member such as an absorber, and the clothing side surface is both front and back surfaces of each member such as an absorber. Of these, the surface is directed to the opposite side of the wearer's skin when worn. Body fluid refers to fluid discharged from the body, such as urine, blood, and water in loose stool. Furthermore, the use of the absorbent article 1 is not particularly limited, and is generally a tape-type disposable diaper, a pants-type disposable diaper, a urine-absorbing pad, a light incontinence pad, regardless of whether it is for infants or adults. It may be a sanitary product or the like.

  The absorbent article 1 includes a liquid-permeable top sheet 21 disposed on the body-side surface, a liquid-impermeable back sheet disposed so as to face the top sheet 21, and a space between the top sheet 21 and the back sheet. And at least one layer of the absorber.

  Further, in the absorbent article 1, an elastic member for three-dimensional gathering is provided at both ends in the width direction on the top sheet 21 along the longitudinal direction of the absorbent article 1 in order to prevent the side leakage of the body fluid excreted by the user. A pair of three-dimensional gathers may be provided. 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 21, and the center is a free end that is not fixed to the top sheet 21. 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 21 may be formed from a base material having liquid permeability that allows body fluid to move to the absorbent body. Examples thereof include nonwoven fabrics such as air-through nonwoven fabric, thermal bond nonwoven fabric, and spunbond nonwoven fabric, and thermal bond / spunbond. It is formed from the composite nonwoven fabric etc. which laminated | stacked. Further, the top sheet 21 may be embossed or perforated on the surface in order to improve the 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 21 may contain a lotion, an antioxidant, an anti-inflammatory component, a pH adjuster, an antibacterial agent, a moisturizing agent and the like. Furthermore, in terms of strength and workability, the basis weight of the nonwoven fabric per sheet constituting the top sheet 21 is preferably 13 g / ^{m 2} or more 50 g / ^{m 2} or less. Although there is no restriction | limiting in particular as a shape of the top sheet | seat 21, What is necessary is just a shape which covers an absorber required in order to guide a bodily fluid to an absorber so that there may be no leak.

FIG. 1 is a view showing an aspect when a top sheet 21 is formed by laminating a nonwoven fabric sheet 212 of the body side uppermost layer and a nonwoven fabric sheet 213 positioned in a lower layer. 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 nonwoven fabric sheets constituting the top sheet 21 is preferably 2 or more and 4 or less, and more preferably 2 or more and 3 or less. Moreover, as a combination of the 2 or more nonwoven fabric sheets which comprise the top sheet 21, the same kind of nonwoven fabric sheet may be used in combination, and different types of nonwoven fabric sheets may be used in combination. As a nonwoven fabric sheet which comprises the top sheet 21, it is preferable that it is a nonwoven fabric sheet comprised from an air through nonwoven fabric. The basis weight of the two nonwoven fabric sheets constituting the top sheet 21 is preferably such that the basis weight of the nonwoven fabric sheet 213 positioned in the lower layer is higher than the basis weight of the nonwoven fabric sheet 212 of 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, linear slits 214 penetrating the nonwoven fabric sheet are intermittently provided in the nonwoven fabric sheet constituting the top sheet 21 along the longitudinal direction of the absorbent article 1. And the slit 214 provided in each of the at least two nonwoven fabric sheets laminated | stacked up and down does not overlap with an up-down direction. By providing the slit 214 in the nonwoven fabric sheet, the bodily fluid excreted on the top sheet 21 is absorbed by the absorber through the slit 214, so that rapid absorption of the bodily fluid is ensured and the absorption rate is increased. It is also possible to prevent body fluid from remaining inside the nonwoven fabric sheet.

  In this invention, it is preferable that the slit 214 provided in each nonwoven fabric sheet is linearly arranged intermittently along the longitudinal direction. By arranging the slits 214 provided in each of the nonwoven fabric sheets linearly and intermittently, a configuration in which the slits of the nonwoven fabric sheets stacked one above the other do not overlap each other can be easily realized without cost.

  FIG. 2 is a drawing showing dimensions of slits 214 provided in the nonwoven fabric sheet. In the present invention, among the laminated nonwoven fabric sheets, the length of the slit 214 in the body-side uppermost nonwoven fabric sheet 212 is preferably 5 mm or more and 30 mm or less per slit 214, and is preferably 10 mm or more and 20 mm or less. It is more preferable. The slits 214 adjacent in the longitudinal direction are preferably separated from each other by an interval of 5 mm or more and 50 mm or less, and more preferably separated from each other by an interval of 15 mm or more and 30 mm or less. The width of the slit 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. The distance in the width direction of the slit 214 of the nonwoven fabric sheet 212 on the body-side uppermost layer is preferably 5 mm or more and 30 mm or less, and more preferably 10 mm or more and 20 mm or less. By making the dimension of the slit 214 of the nonwoven fabric sheet 212 of the body side uppermost layer within the above range, it is possible to reduce the amount of body fluid remaining in the nonwoven fabric sheet while ensuring rapid absorption of body fluid. .

  Moreover, among the laminated nonwoven fabric sheets, the length of the slit 214 of the nonwoven fabric sheet 213 located in the lower layer is preferably 5 mm or more and 30 mm or less, more preferably 10 mm or more and 20 mm or less per slit 214. preferable. The slits 214 adjacent in the longitudinal direction are preferably separated from each other by an interval of 5 mm or more and 50 mm or less, and more preferably separated from each other by an interval of 15 mm or more and 30 mm or less. The width of the slit 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 making the dimension of the slit 214 of the nonwoven fabric sheet 213 located in the lower layer within the above range, it is possible to reduce the amount of body fluid remaining in the nonwoven fabric sheet while ensuring rapid absorption of body fluid.

  In the present invention, in a state where at least two nonwoven fabric sheets are laminated, the slit 214 of the nonwoven fabric sheet 212 of the body side uppermost layer and the slit 214 of the nonwoven fabric sheet 213 located in the lower layer are 2 mm or more and 15 mm or less in the width direction. It is preferable that they are separated. The slits 214 of the nonwoven fabric sheet 213 located in the lower layer are provided at a separation distance of 2 mm or more and 15 mm or less on both sides in the width direction of the slit 214 of the nonwoven fabric sheet 212 on the body side uppermost layer in a state where the upper and lower nonwoven fabric sheets are laminated. It may be provided, and may be provided only on one side of the slit 214 of the nonwoven fabric sheet 212 of the body side uppermost layer with a separation distance of 2 mm or more and 15 mm or less. In the state where the upper and lower nonwoven fabric sheets are laminated, the slit 214 provided in the nonwoven fabric sheet does not overlap in the vertical direction, so that the absorbent body located in the lower layer of the top sheet 21 can be prevented from directly touching the skin. , Body fluid reversion can be suppressed.

[Back sheet]
The back sheet may be formed using a base material having a liquid impermeability so that the body fluid held by the absorbent does not wet the clothing, and a composite sheet obtained by laminating a resin film or a resin film and a nonwoven fabric. It is formed from the material. The nonwoven fabric used for the composite sheet is not particularly limited, and examples thereof include spunbond nonwoven fabric and meltblown nonwoven fabric, or 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 that a back seat | sheet has air permeability. 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]
It is preferable that an absorber contains the absorptive fiber as a base material and a superabsorbent polymer (SAP). 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 such fluff pulp include wood pulp, synthetic fiber, polymer fiber, non-wood pulp and the like that have been fibrillated into cotton. The absorbent fibers of the absorbent body preferably have 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 absorber is not particularly limited as long as it can absorb body fluid and prevent backflow. Sodium polyacrylate-based, polyaspartate-based, (starch-acrylic acid) graft copolymer A polymer, (acrylic acid-vinyl alcohol) copolymer, (isobutylene-maleic anhydride) copolymer, and a saponified product thereof can be used. Among these, sodium polyacrylate is preferable from the viewpoint of the amount of absorption per weight. The SAP amount of the absorbent body is preferably 50 g / m ² or more and 500 g / m ² or less, and preferably 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 that formed by mixing SAP particles in the absorbent fiber, or a SAP sheet in which the SAP particles are fixed between the absorbent fibers. . Moreover, it is preferable to wrap an absorber in a carrier sheet for the purpose of preventing leakage of SAP particles and stabilizing the shape of the absorber. 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.

  The absorber is preferably formed by laminating 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 absorber and the lower layer absorber may be such that the length of the upper layer absorber is longer than the length of the lower layer absorber, and the length of the upper layer absorber is the length of the lower layer absorber. It may be the same as the length, and the length of the upper layer absorber may be shorter than the length of the lower layer absorber.

  The absorbent article 1 of the present invention may have an SAP sheet in which a superabsorbent polymer is sandwiched between two nonwoven sheets in addition to the absorbent body. By using such an SAP sheet, the absorbent performance of the absorbent article 1 can be further improved.

<Method for producing absorbent article>
The manufacturing method of the absorbent article 1 can employ a well-known method. For example, (A) a step of forming an absorbent mat by stacking absorbent fibers together with a superabsorbent polymer to form an absorbent body (B) A step of fixing and integrating the top sheet 21 and the three-dimensional gather with a hot melt adhesive, and (C) a step of applying a hot melt adhesive on the inside of the top sheet 21, the three-dimensional gather, and the back sheet. (D) In the collective drum, a step of disposing the top sheet 21 on the upper part of the absorbent body and a back sheet on the lower part of the absorbent body, and fixing and integrating the constituent members; The manufacturing method etc. which have a process which cuts each absorbent article 1 by cutting with a cutter apparatus by a product dimension can be mentioned. In the present invention, prior to laminating the top sheet 21 with the absorbent body, the nonwoven sheet with the slits 214 formed thereon may be laminated at a predetermined position and used as the top sheet 21 by an arbitrary cutter or the like.

  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 absorber)
An absorbent mat in which 6 g of fluff pulp pulverized by pulp pulp and 7 g of superabsorbent polymer was prepared was prepared and cut to a length of 330 mm and a width of 105 mm. The absorbent body was laminated together with the top sheet and the back sheet, and a pair of three-dimensional gathers for preventing side leakage was formed to produce an absorbent article having a length of 400 mm and a width of 320 mm. In addition, the basic weight of the nonwoven fabric sheet (air through nonwoven fabric) of the body side uppermost layer among the nonwoven fabric sheets which comprise a top sheet is 18 g / m < ² >, and the basic weight of the nonwoven fabric sheet (air through nonwoven fabric) located in a lower layer is 20 g. / M ² , slits each having a length of 10 mm and a width of 1 mm were formed in each nonwoven fabric sheet so that the distance between the slits in the longitudinal direction was 15 mm. The distance in the width direction of the slit formed in the nonwoven fabric sheet on the body side uppermost layer is 10 mm, and the distance in the width direction between the slit formed in the nonwoven fabric sheet located in the lower layer and the nonwoven fabric sheet located in the body uppermost layer is 5 mm. did. As the back sheet, a breathable polyethylene film (basis weight 18 g / m ² ) was used. The absorption rate and liquid return amount of the obtained absorbent article were measured and evaluated according to the following.

(Absorption rate)
A center part of the absorbent article in the longitudinal direction and the width direction, with a measuring jig having an inner diameter of 30 mm opened in the center of an outer diameter of 80 mm and a weight of 2000 g with the top sheet facing upward The physiological saline 40ml (temperature 36 ± 3 ° C) is dropped from the upper hole, and when the physiological saline comes into contact with the absorbent article, the physiological saline is placed on the circumference in the center circle of the measuring jig. The time was taken as the end point until the gas was completely sucked, and the rate was taken as the absorption rate. After the physiological saline was completely absorbed into the absorbent article, the absorbent article was left for 3 minutes and the same absorption test was repeated three times.

(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 sheets of filter paper (No. 2 filter paper manufactured by ADVANTEC, diameter: 55 mm), which had been previously weighed, were placed in the injection section. Placed in the center, an acrylic plate and a weight were placed on the filter paper (pressure: 35 gf / cm ² ). Ten minutes after placing the weight, the weight of the filter paper was measured, and the weight difference (g) of the filter paper before and after the test was taken as the liquid return amount. The liquid return amount was an average value of N = 10 samples. The smaller the liquid return amount, the better the absorption performance.

(Comprehensive judgment)
○: Absorption speed is fast and the amount of return is small △: Absorption speed is slow and the amount of return is large

<Example 2>
A slit of 20 mm in length and 1 mm in width is formed in the nonwoven fabric sheet on the body side uppermost layer and the lower layer nonwoven fabric sheet so that the longitudinal interval of each slit is 25 mm, and formed in the nonwoven fabric sheet on the body side uppermost layer Example 1 except that the distance in the width direction between the slit formed in the nonwoven fabric sheet positioned in the lower layer and the nonwoven fabric sheet positioned in the body uppermost layer is 10 mm in the width direction of the slit. Similarly, an absorbent article was produced.

<Comparative Example 1>
An absorbent article was prepared in the same manner as in Example 1 except that no slit was formed in the nonwoven fabric sheet on the body-side uppermost layer, and the separation distance in the width direction of the slit formed in the nonwoven fabric sheet located in the lower layer was 20 mm. .

<Comparative example 2>
An absorbent article was produced in the same manner as in Example 1 except that no slit was provided in the top sheet.

The results are shown in Table 1.

  As shown in Table 1, in the absorbent articles of Examples 1 and 2, since a large number of slits are formed in the nonwoven fabric sheet constituting the top sheet, the absorption rate increases and slits are formed. As a result, the water retention amount of the nonwoven fabric sheet was lowered and the amount of reversion was also reduced. The numerical values for the absorption rate and the amount of reversion of Example 1 and Comparative Example 1 are significantly higher than those of Comparative Example 1 in which no slit is provided in the nonwoven fabric sheet on the body side uppermost layer and Comparative Example 2 in which no slit is provided. It was improved. From these results, it was found that according to the present invention, it is possible to provide an absorbent article in which the absorption rate is increased, the amount of reversion is reduced, and the body fluid absorbed in the top sheet hardly remains.

DESCRIPTION OF SYMBOLS 1 Absorbent article 21 Top sheet 212 Non-woven fabric sheet of body side uppermost layer 213 Non-woven fabric sheet positioned in lower layer 214 Slit Y Longitudinal direction X Width direction

Claims (7)

An absorbent article having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between the top sheet and the back sheet,
The top sheet is composed of at least two liquid-permeable nonwoven sheets,
The nonwoven fabric sheet is intermittently provided with linear slits that penetrate the nonwoven fabric sheet along the longitudinal direction of the absorbent article,
The slit provided in each of the nonwoven fabric sheet laminated | stacked up and down is an absorbent article which does not overlap with an up-down direction.   The slit of the nonwoven fabric sheet of the body side uppermost layer among the laminated nonwoven fabric sheets has a length of 5 mm or more and 30 mm or less, and slits adjacent in the longitudinal direction are spaced apart by an interval of 5 mm or more and 50 mm or less. 2. The absorbent article according to 1. Among the laminated nonwoven fabric sheets, the slits of the nonwoven fabric sheet located in the lower layer have a length of 5 mm or more and 30 mm or less, and slits adjacent in the longitudinal direction are spaced apart by an interval of 5 mm or more and 50 mm or less,
The slit of the nonwoven fabric sheet of the body side uppermost layer and the slit of the nonwoven fabric sheet located in the lower layer are spaced apart by 2 mm or more and 15 mm or less in the width direction in a state where at least two of the nonwoven fabric sheets are laminated. Or the absorbent article of 2.   The absorptive article according to any one of claims 1 to 3 whose width of a slit provided in said laminated nonwoven fabric sheet is 0.5 mm or more and 2.5 mm or less. Among the laminated nonwoven fabric sheets, the basis weight of the nonwoven fabric sheet located in the lower layer is 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 body-side uppermost layer is 13 g / m ^2. The absorbent article according to any one of claims 1 to 4, which is 30 g / m ² or more.   The absorptive article according to any one of claims 1 to 5 whose basis weight of the nonwoven fabric sheet located in a lower layer among said laminated nonwoven fabric sheets is higher than the basis weight of the nonwoven fabric sheet of the body uppermost layer.   The absorbent article in any one of Claim 1 to 6 whose nonwoven fabric sheet which comprises a top sheet is an air through nonwoven fabric.

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