JP2019187945A - Absorbent article - Google Patents

Abstract

To provide an absorbent article excellent in absorption rate and wearing feeling without damaging merits using a fiber assembly formed of a tow excellent in resilience and flexibility.SOLUTION: There is provided an absorbent article 1 comprising: a liquid permeable top sheet 10; a liquid impermeable back sheet 20; and an absorption layer arranged between the top sheet 10 and the back sheet 20, the absorption layer comprises: a first absorber 30 (upper absorber) having a first absorbent core 31 including at least a fluff pulp out of a fluff pulp and high absorbent polymer; and a second absorber 40 (lower absorber) having a second absorbent core 41 including a fiber assembly formed of a tow and a second high absorbent polymer, and a basis weight of each member in the respective absorbent core and a ratio of respective members are adjusted.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an absorbent article such as a light incontinence pad.

  In general, an absorbent article is composed of a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the top sheet and the back sheet. The body fluid is absorbed by the absorbent body through the top sheet. In addition, as the absorbent body, an aspect in which an absorbent core containing fluff pulp and a super absorbent polymer (also referred to as SAP) is wrapped with a carrier sheet such as crepe paper is widely known. . These absorbent bodies are formed by stacking fluff pulp short fibers and a superabsorbent polymer on a stacking drum to produce an absorbent core and then wrapping the core in a carrier sheet.

  On the other hand, instead of a fluff pulp short fiber stack, a tow (fiber bundle) composed of filament-like long fiber webs (hereinafter referred to as a fiber aggregate made of tow) is used as an absorbent. It has been proposed to use. By using a fiber assembly made of tow instead of fluff pulp, an absorbent body excellent in flexibility and flexibility can be obtained. Moreover, by using the absorber excellent in a softness | flexibility and flexibility, it can make it inconspicuous wearing the absorbent article under clothes, and fit property also improves.

  As an absorbent article using an absorbent containing a fiber assembly made of tow, for example, Patent Document 1 has a collection of filaments and high-absorbent polymer particles obtained by opening a tow, and both sides of the crotch portion. The absorbent body is characterized in that it has superabsorbent polymer particles in the main absorbent part other than the part, and the basis weight of the superabsorbent polymer particles on both sides of the crotch part is less than that of the main absorbent part. An absorbent article is disclosed.

  Patent Document 2 includes an assembly of filaments that have been opened tow and an absorber having superabsorbent polymer particles, and the superabsorbent polymer that has escaped from the filament is retained on the back side of the absorber. An absorbent article provided with a holding sheet is disclosed.

JP 2007-268218 A JP 2006-280579 A

Here, when using a fiber assembly made of tow instead of fluff pulp, the supportability of the superabsorbent polymer is reduced, and the superabsorbent polymer falls off on the lower side of the absorber, A rough and uncomfortable feeling may occur, and the advantage of using a fiber assembly made of tows that is excellent in flexibility and flexibility may not be utilized, and the wearing feeling may be impaired. In addition, since the superabsorbent polymer is not uniformly supported on the fiber aggregate made of tow, there may be a variation in absorbability.
In addition, the fiber assembly made of tow is low in hydrophilicity and its own absorption rate is inferior to fluff pulp, so when a large amount of urine is excreted at once, it cannot be absorbed and leaks occur. There was a case.

For example, in an absorbent body using a fiber assembly made of tow as in Patent Document 1, the basis weight of the superabsorbent polymer on both sides of the crotch portion is less than that of the main absorbent portion, thereby following the body side. Increases the performance and improves the fit. Then, Patent Document 1, as the basis weight of each component, the basis weight of the fiber aggregate composed of tow is 30 g / m ² or more 300 g / m ² or less, the basis weight of the superabsorbent polymer in the both sides of the crotch portion Is 100 g / m ² or less, and the average of the entire absorbent element is 50 g / m ² or more and 350 g / m ² or less. Even if these ranges are satisfied, the fiber assembly made of tow When the basis weight of the superabsorbent polymer is too large with respect to the basis weight, the supportability of the superabsorbent polymer in the fiber assembly made of tow is not good, and it is worn because it feels rough and uncomfortable when worn. There is a case where the feeling is impaired, and during the absorption, blocking by the superabsorbent polymer which has absorbed and swelled moisture occurs, and the absorption rate may decrease.

  Further, in Patent Document 2, the holding sheet provided between the absorbent body using the fiber assembly made of tow and the back sheet holds the superabsorbent polymer dropped from the fiber assembly made of tow. In some cases, the superabsorbent polymer is unevenly distributed on the surface of the holding sheet, and the absorption performance varies depending on the position in the absorbent body, making it difficult to control the absorption rate.

  Therefore, the present invention has been made in view of the above problems, and the present invention maintains a good feeling of wearing without impairing the advantage of using a fiber assembly made of tow that is excellent in flexibility and flexibility. And an object of the present invention is to provide an absorbent article having a good absorption rate.

  The inventors of the present invention have conducted intensive research in view of the above problems. As a result, of the fluff pulp and the superabsorbent polymer, the upper layer absorber having an absorbent core containing at least the fluff pulp, and the lower layer absorbent comprising the fiber core made of tow and the absorbent core containing the superabsorbent polymer. It was found that the above-mentioned problems can be solved by adjusting the basis weight of each substrate in each absorbent core and the ratio thereof, and the present invention has been completed. Specifically, the present invention provides the following.

(1) A first aspect of the present invention includes a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorption layer disposed between the top sheet and the back sheet. The absorbent article includes a first absorbent body located on the top sheet side and a second absorbent body located on the back sheet side, wherein the first absorbent body is fluff pulp And the first superabsorbent polymer, the first absorbent core containing at least fluff pulp, and the first carrier sheet covering the first absorbent core, and the second The absorbent body comprises a fiber assembly made of tow, a second absorbent core containing a second superabsorbent polymer, and a second carrier sheet covering the second absorbent core, The basis weight of the fluff pulp is 80 g / m ² or more and 1 The basis weight of the first superabsorbent polymer is not less than 0 times and not more than 1.0 times the basis weight of the fluff pulp, and the basis weight of the fiber aggregate composed of the tow is 50 g / m ² or less. The basis weight of the second superabsorbent polymer is not less than 60 g / m ^{2 and not} more than 500 g / m ² , and the amount of the fiber aggregate made of the tow is 20 g / m ² or more and 100 g / m ² or less. It is 0.6 times or more and 5.0 times or less with respect to the basis weight, and the loading ratio of the second superabsorbent polymer to the fiber assembly made of tow is 70% or more, and in plan view The end portions in the longitudinal direction and the end portions in the width direction of the first absorbent body are overlapped with each other or the end portions in the longitudinal direction and the end portions in the width direction of the second absorbent body, respectively. The area of the first absorber is 0.3 mm relative to the area of the second absorber. 1.0 times or less, the longitudinal dimension of the first absorber is a, the width dimension is b, the longitudinal dimension of the second absorber is A, and the width dimension. Is an absorbent article satisfying a ≦ A, b ≦ B, and a / b ≧ 1.

  (2) A second aspect of the present invention is the absorbent article according to (1), wherein the constituent fiber of the fiber assembly made of tow is a fiber made of cellulose acetate. is there.

  (3) A third aspect of the present invention is the absorbent article according to (1) or (2), wherein the first absorbent core is included in the second absorbent core. It has at least two pressing grooves provided substantially parallel to the orientation direction of the constituent fibers of the fiber assembly.

  According to the present invention, it is possible to provide an absorbent article that maintains a good feeling of wear and has a good absorption rate without losing the advantage of using a fiber assembly made of tows that are excellent in flexibility and flexibility. Can do.

It is a top view of the absorptive article of the present invention. It is _X 1 -X ₁ cross-sectional view of FIG. It is drawing used in order to demonstrate the method to measure the loading rate of the 2nd superabsorbent polymer to the fiber assembly which consists of tows.

<Absorbent article>
As the absorbent article 1 according to the embodiment of the present invention, a light incontinence pad is exemplified, but the absorbent article 1 of the present invention is not limited to this, and a light incontinence liner, a sanitary napkin, other It may be an absorbent article.
As shown in FIG. 1, the absorbent article 1 includes a liquid-permeable top sheet 10 disposed on the body-side surface, and a liquid-impermeable back sheet disposed on the clothing-side surface facing the top sheet 10. 20 and an absorbent layer disposed between the top sheet 10 and the back sheet 20. Thereby, the absorption layer has a structure sandwiched between the top sheet 10 and the back sheet 20. Specifically, the absorption layer has a structure including a first absorbent body 30 located on the top sheet 10 side and a second absorbent body 40 located on the back sheet 20 side.
In the description of the present specification, the longitudinal direction of the absorbent article 1 is a direction extending forward and backward of 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 that is transverse or orthogonal to the longitudinal direction, and is a direction indicated by a symbol X in the drawing. Furthermore, in the description of the present specification, the body-side surface refers to the surface disposed on the skin side of the wearer when worn among the front and back surfaces of each member, and the clothing-side surface refers to the front and back surfaces of each member. Of these, it refers to the surface directed to the opposite side of the wearer's skin when worn.

  The absorbent article 1 preferably has a longitudinal dimension of 100 mm to 400 mm and a width dimension of 30 mm to 110 mm. By adjusting the size of the absorbent article 1 to the above range, the absorbent article 1 suitable for a light incontinence pad, a light incontinence liner, a sanitary napkin, or the like can be obtained.

[Top sheet]
The top sheet 10 allows body fluid to pass quickly toward the first absorbent body 30 and the second absorbent body 40, and the back sheet is sandwiched between the first absorbent body 30 and the second absorbent body 40. 20 is arranged to face. Since the top sheet 10 is a sheet that comes into contact with the skin, the foam has a soft feel and does not irritate the skin, such as a hydrophilic non-woven fabric, an open film such as an open polyethylene film, and foamed urethane foam. It is formed from a film or a composite sheet in which these are laminated. In addition, the top sheet 10 may be a single layer or may be laminated with a plurality of layers, and a plurality of through holes may be formed in order to impart dry touch properties.

  Moreover, as a hydrophilic nonwoven fabric having the above properties, synthetic fibers such as polypropylene and polyethylene, recycled fibers such as rayon, natural fibers such as cotton, thermal bond method, air-through method, spunlace method, What was obtained by well-known processing methods, such as the spun bond method, can be used.

The basis weight of the top sheet 10 is preferably 13 g / m ² or more and 40 g / m ² or less from the viewpoint of workability and strength. In order to reduce irritation to the skin, lotion, antioxidant, anti-inflammatory component, pH adjuster, antibacterial agent, moisturizer and the like may be applied to the top sheet 10.

[Back sheet]
As the back sheet 20 used in the present invention, a sheet material having liquid impermeability and water impermeability is used. However, the back sheet 20 may have moisture permeability to prevent stuffiness. Examples of the material of the back sheet 20 having such characteristics include a thin plastic sheet such as a polyethylene sheet and a polyethylene laminated nonwoven fabric. Incidentally, the basis weight of the backsheet 20 from the viewpoint of processability and strength, it is preferably 15 g / ^{m 2} or more 60 g / ^{m 2} or less.

  In addition, although not shown in figure, the adhesive layer for adhering the absorbent article 1 to underwear etc. may be provided in the clothing side surface of the back sheet 20 at the time of wear. Moreover, when the absorbent article 1 has an adhesive layer, it may have a release sheet for protecting the adhesive layer, and this release sheet is partially joined to the packaging sheet of the absorbent article 1. It may be.

[Absorbing layer]
As shown in FIG. 2, the absorbent layer used in the absorbent article 1 of the present invention includes a first absorbent body 30 located on the top sheet 10 side and a second absorbent body 40 located on the back sheet 20 side. Including.
And the 1st absorber 30 is the 1st absorptive core 31 which contains a fluff pulp at least among the fluff pulp and the 1st superabsorbent polymer, and the 1st which covers the 1st absorptive core 31 The second absorbent body 40 includes a second absorbent core 41 containing a fiber assembly made of tow and a second superabsorbent polymer, and a second absorbent core. And a second carrier sheet 42 covering 41.
Here, since the 1st absorptive core 31 contains a fluff pulp at least, it is excellent in an absorption rate by the outstanding liquid diffusibility of a fluff pulp. The second absorbent core 41 is excellent in flexibility and flexibility because it contains a fiber assembly made of tow, but in terms of urine diffusivity and absorption speed, the first absorbent core 41 contains fluff pulp. This is inferior to the absorbent core 31. Therefore, in the present invention, as the absorption layer, the first absorber 30 excellent in the absorption rate is used as the upper layer, and the second absorber 40 excellent in flexibility and flexibility is used as the lower layer, so that the flexibility and Without losing the advantage of using a fiber assembly made of tows that are excellent in flexibility, it is possible to provide an absorbent article 1 that maintains a good wearing feeling and has a good absorption rate.

It is preferable that the 1st absorber 30 and the 2nd absorber 40 are substantially square or a substantially rectangular from a viewpoint of operativity in planar view.
In a plan view, each end in the longitudinal direction and each end in the width direction of the first absorber 30 overlap with each end in the longitudinal direction and each end in the width direction of the second absorber 40, respectively. Located inward, the area of the first absorber 30 is not less than 0.3 times and not more than 1.0 times the area of the second absorber 40. Thereby, without losing the advantage by using the fiber assembly which consists of a toe excellent in a softness | flexibility and flexibility, a feeling of wear can be maintained favorable and the absorption speed as the whole absorption layer can be improved. .
In other words, if the area of the first absorbent body 30 relative to the area of the second absorbent body 40 is too small, the absorption rate cannot be improved, and if it is too large, the tow excellent in flexibility and flexibility. The advantage which provided the 2nd absorber 40 using the fiber assembly which consists of is impaired, and the softness | flexibility and flexibility as the whole absorption layer will fall. Therefore, in this invention, the area of the 1st absorber 30 with respect to the area of the 2nd absorber 40 was made into said range.

The first absorbent body 30 and the second absorbent body 40 can improve the absorptivity of the entire absorbent layer if they overlap in the thickness direction in the widest possible range, and therefore the first absorbent body 30 and the second absorbent body. When the dimensions in the longitudinal direction and the width direction of 40 are the same, in the plan view, each end in the longitudinal direction and each end in the width direction of the first absorber 30 are respectively the second absorber 40. It arrange | positions so that it may overlap with respect to each edge part of a longitudinal direction and each edge part of the width direction.
For the same reason, when the longitudinal direction and the width direction of the first absorbent body 30 are smaller than the longitudinal direction and the width direction of the second absorbent body 40, respectively, in plan view, The longitudinal direction end portions and the width direction end portions of the first absorbent body 30 are positioned inward with respect to the longitudinal direction end portions and the width direction end portions of the second absorbent body 40, respectively. Arrange. Furthermore, in this case, when a large amount of urine is excreted at a time, it is necessary to increase the absorption speed of the central region of the absorption layer located in the urination region, and therefore the first absorber 30 in plan view. The distance from one end in the width direction to one end in the width direction of the second absorber 40 and the width in the width direction of the second absorber 40 from the other end in the width direction of the first absorber 30 The distance from the one end in the longitudinal direction of the first absorber 30 to the one end in the longitudinal direction of the second absorber 40 is equal to the distance to the other end, and the first It is preferable to arrange so that the distance from the other end portion in the longitudinal direction of the absorber 30 to the other end portion in the longitudinal direction of the second absorber 40 is equal.

  In the case where the longitudinal dimension of the first absorbent body 30 is a, the lateral dimension is b, the longitudinal dimension of the second absorbent body 40 is A, and the lateral dimension is B. A ≦ A, b ≦ B, and a / b ≧ 1. By satisfying this formula, the absorptivity of the entire absorption layer can be improved.

(First absorber)
As described above, the first absorbent body 30 includes the first absorbent core 31 containing at least the fluff pulp and the first absorbent core 31 among the fluff pulp and the first superabsorbent polymer. And a single carrier sheet 32. It is preferable that the thickness of the 1st absorber 30 is 1.5 mm or more and 3.0 mm or less so that a feeling of wear may not be spoiled, making an absorption rate favorable. Moreover, it is preferable that the dimension of the longitudinal direction of the 1st absorber 30 is 95 mm or more and 395 mm or less, and the dimension of the width direction is 25 mm or more and 105 mm or less.

As fluff pulp, wood pulp, synthetic fiber, polymer fiber, non-wood pulp and the like defibrated in a cotton shape can be exemplified. In the present invention, the basis weight of fluff pulp contained in the first absorbent core 31 is 80 g / ^{m 2} or more 150 g / ^{m 2} or less. By making the basis weight of the fluff pulp contained in the first absorbent core 31 into the above range, the second absorbent body 40 is made of a fiber assembly made of tow that is excellent in flexibility and flexibility. Without impairing the advantages, it is possible to maintain a good feeling of wear and improve the absorption rate of the absorbent layer as a whole. In other words, if the basis weight of the fluff pulp is too large, the softness and flexibility of the absorbent layer as a whole are reduced.

The first superabsorbent polymer is not particularly limited as long as it absorbs bodily fluids and can prevent backflow. Sodium polyacrylate, polyaspartate, (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.
In the present invention, the basis weight of the first superabsorbent polymer is not less than 0 times and not more than 1.0 times the basis weight of the fluff pulp. When the basis weight of the superabsorbent polymer is large, the amount of absorption increases, but the superabsorbent polymer has a property of swelling when it absorbs water, blocking occurs due to swelling, and the absorption to the second absorbent body 40 is increased. The diffusibility is impaired, and the flexibility and flexibility of the absorbent layer as a whole are lowered, and the advantages of using a fiber assembly made of tow that is excellent in flexibility and flexibility are impaired. Therefore, the relationship between the basis weight of the first superabsorbent polymer and the basis weight of the fluff pulp is set to the above range. Furthermore, it is preferably 0 to 0.2 times the basis weight of the fluff pulp.

The first carrier sheet 32 may be covered so as to wrap the entire first absorbent core 31 or may be covered so as to be sandwiched from above and below. By covering the first absorbent core 31 with the first carrier sheet 32, the shape of the first absorbent core 31 can be maintained, and in addition, the first superabsorbent polymer is the first absorbent core. It is possible to prevent leakage to the outside of the body 30. Examples of the first carrier sheet 32 include hydrophilic nonwoven fabrics such as tissue, absorbent paper, spunbond nonwoven fabric, and airlaid nonwoven fabric. It is preferable to use tissue from the viewpoint of liquid diffusibility, water retention, and cost. The basis weight of one carrier sheet 32 is preferably 10 g / m ² or more and 40 g / m ² or less, more preferably 15 g / m ² or more and 20 g / m ² or less from the viewpoint of strength and wearing feeling. .

  It is preferable that the 1st absorptive core 31 has at least 2 pressing grooves provided substantially in parallel with the orientation direction of the constituent fiber of the fiber assembly which consists of a tow contained in the 2nd absorptive core 41 mentioned later. . By providing the above-described compressed groove in the first absorbent core 31, the absorption speed of the entire absorbent layer can be further improved.

(Second absorber)
The second absorbent body 40 includes a fiber assembly made of tow and a second absorbent core 41 containing a second superabsorbent polymer, and a second carrier sheet 42 wrapping the second absorbent core 41. It is equipped with. In addition, what was formed from the above-mentioned material as a 1st superabsorbent polymer can be used for a 2nd superabsorbent polymer. The second carrier sheet 42 can have the same configuration as the first carrier sheet 32. It is preferable that the thickness of the 2nd absorber 40 is 1.5 mm or more and 3.0 mm or less so that a feeling of wear may not be spoiled, making an absorption rate favorable. The second absorbent body 40 preferably has a longitudinal dimension of 95 mm to 395 mm and a width dimension of 25 mm to 105 mm.

  A fiber assembly made of tows is an assembly of long fiber filaments obtained by opening the tow, and is converged so that the orientation directions of the long fibers are aligned. In this invention, it is preferable to arrange | position so that the orientation direction of a long fiber may turn into the longitudinal direction of the absorbent article 1. FIG. For example, a fiber assembly composed of a bundle of long fibers can be produced by opening a continuous filament tow and cutting it to an appropriate length.

As the base material of the fiber assembly made of tow, natural cellulose derived from cotton or the like, regenerated cellulose such as rayon, cellulose acetate, polyethylene, polypropylene, PET, or the like can be used, and among these, it is derived from cotton or the like. It is preferable to use natural cellulose, regenerated cellulose such as rayon, and cellulose acetate, and it is more preferable to use cellulose acetate that can easily obtain bulkiness and can impart flexibility and flexibility to the second absorbent body 40.
Further, the fineness of the fiber aggregate made of tow is not particularly limited, but is 0.1 dtex, for example, from the viewpoint that the second absorbent core 41 exhibits desired performance and has sufficient strength for use. It may be 10 dtex or less.

  Moreover, since the entanglement between fibers is weak in the fiber assembly made of tow, it is preferable to use a binder for the purpose of fusing and fixing the entanglement. As the binder, triacetin or the like can be used.

The basis weight of the fiber assembly made of tow is 20 g / m ² or more and 100 g / m ² or less. When the basis weight of the fiber assembly made of tow is in the above range, the second absorbent body 40 can support the second superabsorbent polymer to the extent that the absorbability can be ensured, and is excellent in flexibility and flexibility. Can be obtained. When the basis weight of the fiber assembly made of tow exceeds 100 g / m ² , the degree of compression when reducing the thickness of the second absorbent 40 is increased, and the inherent flexibility of the fiber assembly made of tow and Since flexibility is impaired, it is not preferable.

The basis weight of the second superabsorbent polymer is 60 g / m ² or more and 500 g / m ² or less, and the basis weight of the second superabsorbent polymer is relative to the basis weight of the fiber assembly made of tow. Thus, it is 0.6 times or more and 5.0 times or less. As a result, the necessary amount of absorption can be secured, and the fiber assembly made of tow can carry the second superabsorbent polymer well, resulting in a decrease in wearing feeling due to a rough and uncomfortable feeling when worn. Can be avoided. When the basis weight of the second superabsorbent polymer with respect to the basis weight of the fiber assembly made of tow exceeds 5.0 times, the fiber assembly made of tow supports the second superabsorbent polymer well. I can't do that.
The basis weight of the second superabsorbent polymer is not less than 60 g / m ^{2 and not} more than 300 g / m ² , and the basis weight of the second superabsorbent polymer is relative to the basis weight of the fiber assembly made of tow. Thus, it is preferably 0.6 times or more and 3.0 times or less.

  In the present invention, since the loading ratio of the second superabsorbent polymer to the fiber assembly made of tow is 70% or more, it is possible to avoid a decrease in wearing feeling due to a rough and uncomfortable feeling when worn. it can. Hereinafter, a method for measuring the loading ratio of the second superabsorbent polymer to the fiber assembly made of tow will be described with reference to FIG.

(1) First, a sheet (370 mm long, 110 mm wide) carrying a second superabsorbent polymer on a fiber assembly made of tow before the production of the second absorbent core 41 and the second that drops off after the test. A container for collecting the superabsorbent polymer is prepared.
(2) Grasp both ends in the horizontal direction (reference numeral a in FIG. 3) of the one end in the vertical direction so that the other end in the vertical direction of the sheet is on the bottom. At this time, it adjusts so that the other edge part of the vertical direction of the said sheet | seat may become a position of about 30 cm from the bottom face of the said container.
(3) After that, a shaking operation of moving about 5 cm downward (in the direction of the arrow b in FIG. 3) and returning to the original position is continuously performed 20 times.
(4) The weight of the second superabsorbent polymer dropped into the container was measured and {(weight of the second superabsorbent polymer carried on the sheet before shaking−the second superabsorbent polymer dropped off) Weight) / weight of the second superabsorbent polymer supported on the sheet before shaking} × 100, the numerical value calculated by the formula of the second superabsorbent polymer to the fiber assembly made of tow. The loading ratio (%).

[Three-dimensional gather]
It is preferable that a solid gather is provided on the body side surface of the absorbent article 1 (not shown). This three-dimensional gather forms a body fluid confinement space together with the top sheet 10 so as to prevent the body fluid from leaking. It is preferable that the three-dimensional gather includes a three-dimensional gather sheet and a stretchable elastic member disposed along the free end of the three-dimensional gather sheet. As the elastic elastic member, a thread-like, string-like, or flat-shaped member made of natural rubber, synthetic rubber, polyurethane, or the like can be appropriately used.

<Method for producing absorbent article>
There is no restriction | limiting in particular as a manufacturing method of the absorbent article 1, A conventionally well-known method can be employ | adopted, for example, from the clothing side, the back seat | sheet 20, the 2nd absorber 40, the 1st absorber 30, The top sheet 10 is laminated in this order, and the top sheet 10 and the back sheet 20 are manufactured by fixing the top sheet 10 and the back sheet 20 with a hot melt adhesive, heat embossing, ultrasonic embossing, high frequency embossing or the like over a part or the entire circumference. Can do. And after individually wrapping this in a package, what is necessary is just to fold it into three in the longitudinal direction and fold it.

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is limited to the range of said embodiment, and various change or improvement is added to said embodiment. It will be apparent to those skilled in the art that this is possible. Further, it is apparent from the scope of the claims that the embodiments added with such changes or improvements can also be included in the technical scope of the present invention.

  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.

<Examples 1 to 10, Comparative Examples 1 to 7>
Absorbent articles using the following absorbers were prepared and evaluated for absorption speed, flexibility / flexibility, and a sense of discomfort (the supportability of the superabsorbent polymer of the second absorber).

<Production of absorber>
(First absorber)
The first absorbent core was produced by stacking the deflated fluff pulp and the superabsorbent polymer so as to have the basis weight shown in Table 1. Next, the first absorbent core is covered with the first carrier sheet (tissue, basis weight 20 g / m ² ) so as to wrap the whole, and the dimensions in the longitudinal direction and the width direction are the numerical values described in Table 1. A first absorber having a substantially rectangular shape in plan view was obtained.
(Second absorber)
First, in order to obtain the basis weight shown in Table 1, a fiber assembly made of tow (component fiber: fiber made of cellulose acetate) and a second superabsorbent polymer are stacked to form a second absorbent core. Produced. Next, the second absorbent core is covered with a second carrier sheet (tissue, basis weight 20 g / m ² ) so as to wrap the whole, and the dimensions in the longitudinal direction and the width direction are the numerical values described in Table 1. A second absorber having a substantially rectangular shape in plan view was obtained.

<Production of absorbent article>
From the clothing side, the back sheet, the second absorbent body, the first absorbent body, and the top sheet are laminated in this order, and the top sheet and the back sheet are fixed with a hot melt adhesive over the entire circumference. An absorbent article having a width of 375 mm and a width dimension of 115 mm was obtained. In addition, about the absorbent article of the comparative example 1, it laminated | stacked without providing a 1st absorber. Further, a hydrophilic air-through nonwoven fabric (basis weight 20 g / m ² ) was used as the top sheet, and a non-breathable polyethylene sheet (basis weight 20 g / m ² ) was used as the back sheet.
In addition, when the longitudinal direction and the width direction dimension of the first absorber and the second absorber are the same, in the plan view, the longitudinal direction ends and the width direction ends of the first absorber The parts were arranged so as to overlap with the respective ends in the longitudinal direction and the respective ends in the width direction of the second absorbent body.
Moreover, when the longitudinal direction and width direction dimensions of the first absorbent body are smaller than the longitudinal direction and width direction dimensions of the second absorbent body, respectively, the longitudinal direction of the first absorbent body in plan view Each end in the direction and each end in the width direction were arranged so as to be located inward with respect to each end in the longitudinal direction and each end in the width direction of the second absorber. In this case, the distance from one end in the width direction of the first absorber to one end in the width direction of the second absorber and the other end in the width direction of the first absorber in plan view And the distance from the other end in the width direction of the second absorber to the same, and from one end in the longitudinal direction of the first absorber to one end in the longitudinal direction of the second absorber And the distance from the other end portion in the longitudinal direction of the first absorbent body to the other end portion in the longitudinal direction of the second absorbent body are equal to each other.

(Supporting rate of second superabsorbent polymer)
Before preparing the second absorbent core of each example and each comparative example, separately prepare a sheet (370 mm long, 110 mm wide) carrying a second superabsorbent polymer on a fiber assembly made of tow, The loading ratio of the second superabsorbent polymer to the fiber assembly made of tow was measured by the method described above, and the results are shown in Table 1.

(Absorption rate)
A measuring jig of 165 g, in which a cylinder having a hole with an inner diameter of 36 mm is attached on the center of a rectangular (longitudinal dimension: 140 mm, width dimension: 100 mm) (however, the hole penetrates the plate) Was placed on the center of the absorbent article in the longitudinal and width directions, and 687 g of weight was placed on each of the longitudinal ends of the plate. Then, 150 ml of 0.9% physiological saline is injected from the top of the cylinder, and the liquid is completely sucked into the circumference in the center circle of the measuring jig, starting from the point when the physiological saline comes into contact with the absorbent article. The time was measured with the end point as the end point. The smaller the value, the better the absorption performance, and the evaluation was made according to the following criteria. The results are shown in Table 1. ◎ and ○ are acceptable.
◎: When the absorption rate is less than 70 seconds ○: When the absorption rate is 70 seconds or more and less than 98 seconds ×: When the absorption rate is 98 seconds or more

(Flexibility / Flexibility)
About 20 panelists, “softness / flexibility is excellent” or “softness / flexibility is inferior” for softness / flexibility when touching each absorbent article Evaluation was performed by selection, and evaluation was performed according to the following criteria. The results are shown in Table 1. In addition, (double-circle) and (circle) were set as the pass.
A: When “excellent flexibility / flexibility” is 16 or more and 20 or less ○: When “excellent flexibility / flexibility” is 11 or more and 15 or less △: “flexibility” When “excellent in flexibility / flexibility” is 6 or more and 10 or less ×: When “excellent flexibility / flexibility” is not present, or when 1 or more is 5 or less

(Smooth and uncomfortable feeling (wearing feeling): supportability of superabsorbent polymer in second absorbent body)
About 20 panelists, when touching the back sheet of each absorbent article, the rough feeling (uncomfortable feeling) is evaluated by selecting "no rough feeling" or "no rough feeling" Evaluation was made according to the following criteria. The results are shown in Table 1. In addition, (double-circle) and (circle) were set as the pass.
◎: When “no rough discomfort” is 16 or more and 20 or less ○: When “no rough discomfort” is 11 or more and 15 or less △: “No rough discomfort” is 6 When the number of people is 10 or less: No: When there is no “rough discomfort” or when there are 1 or more and 5 or less

  From the above results, according to the present invention, it is possible to maintain a good feeling of wear without sacrificing the advantage of using a fiber assembly made of tows excellent in flexibility and flexibility, and absorbability with a good absorption rate. It can be seen that the article can be provided.

DESCRIPTION OF SYMBOLS 1 Absorbent article 10 Top sheet 20 Back sheet 30 First absorbent body 31 First absorbent core 32 First carrier sheet 40 Second absorbent body 41 Second absorbent core 42 Second carrier sheet

Claims (3)

An absorbent article having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent layer disposed between the top sheet and the back sheet,
The absorbent layer includes a first absorber located on the top sheet side, and a second absorber located on the back sheet side,
The first absorbent body includes a first absorbent core containing at least fluff pulp among fluff pulp and first superabsorbent polymer, and a first carrier sheet covering the first absorbent core; , And
The second absorbent body includes a fiber assembly made of tow, a second absorbent core containing a second superabsorbent polymer, and a second carrier sheet covering the second absorbent core. With
The basis weight of the fluff pulp is 80 g / m ² or more and 150 g / m ² or less,
The basis weight of the first superabsorbent polymer is 0 to 1.0 times the basis weight of the fluff pulp,
The basis weight of the fiber assembly made of the tow is 20 g / m ² or more and 100 g / m ² or less,
The basis weight of the second superabsorbent polymer is 60 g / m ² or more and 500 g / m ² or less, and 0.6 times or more and 5.0 times or less with respect to the basis weight of the fiber assembly made of the tow. And
The loading ratio of the second superabsorbent polymer to the fiber assembly made of tow is 70% or more,
In a plan view, each end in the longitudinal direction and each end in the width direction of the first absorber overlap with each end in the longitudinal direction and each end in the width direction of the second absorber. Or the area of the first absorber is 0.3 to 1.0 times the area of the second absorber,
When the longitudinal dimension of the first absorber is a, the width dimension is b, the longitudinal dimension of the second absorber is A, and the width dimension is B, a Absorbent article satisfying ≦ A, b ≦ B, and a / b ≧ 1.   The absorptive article according to claim 1 whose constituent fiber of said fiber aggregate which consists of said tow is a fiber which consists of cellulose acetate.   The said 1st absorptive core has at least two pressing grooves provided substantially parallel to the orientation direction of the constituent fiber of the fiber assembly which consists of said tow contained in said 2nd absorptive core. Or the absorbent article of 2.