JP2006141647A - Absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent article quickly detaching loose stool from the skin and surely storing and retaining it in a position far from the skin. <P>SOLUTION: This absorbent article is provided with a surface sheet 1 permeating excretory humor facing the skin, a permeable sheet 2 permeating the excretory humor, and an absorbent element 3 positioned in the back side of the permeable sheet 2 and including flocculent pulp retaining the excretory humor in this order. The relation between the soft stool permeable speed S1 of the surface sheet 1, the soft stool permeable speed S2 of the permeable sheet 2, and the soft stool permeable speed S3 of the surface layer sheet 3A of the absorbent element 3 is S1>S2>S3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a disposable paper diaper, an absorbent pad, a sanitary napkin, and more particularly to an absorbent article with improved soft stool absorption retention performance.

  Conventionally, absorption retention performance of soft stool has been a problem in absorbent articles. Specifically, a situation occurs in which soft stool remains on the surface sheet without passing through the surface sheet, or soft stool that has permeated through the surface sheet returns to the surface sheet without being held by the absorber. And it brings about complicated skin wiping work.

  From such a viewpoint, in order to quickly move the soft stool away from the skin and improve the ability to accommodate and hold it at a position far from the skin (also simply referred to as absorption performance such as soft stool), a perforated sheet is used as the top sheet, Techniques for facilitating passage of soft stool and techniques for forming a soft stool accommodation space between the top sheet and the absorber have been proposed (see, for example, Patent Document 1, Patent Document 2, and Patent Document 3).

However, among these, in particular, the one of Patent Document 2 seems to be excellent in the absorption retention performance of soft stool, but according to the experiment of the present inventor, the hydrophilic continuous fiber sufficiently transfers soft stool to the absorbent body. Therefore, there is a demand for further improvement in the absorption retention performance of soft stool.
Japanese Patent Laid-Open No. 2-65861 JP 2001-276125 A JP 2001-269362 A

  Then, the main subject of this invention is providing the absorbent article which is excellent in especially the absorption holding | maintenance performance of urine and loose stool.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
An absorbent product comprising a permeation sheet that passes excretory fluid, and an absorbent element that includes a flocculent pulp that holds the excretory fluid on the back side of the permeation sheet,
The absorbent article, wherein the stool permeation rate S2 of the permeable sheet is larger than the soft stool permeation rate S3 of the surface layer of the absorbent element.

<Invention of Claim 2>
Absorption comprising in order a top sheet that passes through the excrement fluid facing the skin, a permeation sheet that passes through the excretion fluid, and an absorbent element that contains the flocculent pulp that holds the excretion fluid on the back side of the permeation sheet Sex products,
The stool permeation rate S1 of the top sheet, the stool permeation rate S2 of the permeation sheet, and the stool permeation rate S3 of the surface layer of the absorbent element are:
S1>S2> S3
Absorbent article characterized by having a relationship of

<Invention of Claim 3>
The absorptive article according to claim 2 in which said surface sheet consists of a perforated sheet.

<Invention of Claim 4>
In the group of permeation holes for excretion liquid formed at least in the region facing the anus of the perforated sheet, the effective opening area of the single permeation hole is 3 to 75 mm ² and the opening area ratio is 10 to 80%. The absorbent article according to claim 3.

(Operational effects of the inventions of claims 1 to 4)
In the present invention, the stool permeation rate S1 of the top sheet, the stool permeation rate S2 of the permeation sheet, and the soft stool permeation rate S3 of the surface layer of the absorbent element are in a relationship of S1>S2> S3 (in this case, in claim 1) As stated, it is not mandatory to use a face sheet).

  As described above, this type of absorbent article needs to have a high ability to quickly move loose stool away from the skin and to house and hold it at a position far from the skin. In order to achieve this, each component not only has a high stool permeation rate, but also requires a velocity gradient defined in the present invention with respect to the stool permeation rate between the components, and the velocity is higher than the absolute value of the velocity. We found that the gradient was more dominant.

  According to the stool permeability velocity gradient of the present invention, the urine and stool absorption retention performance is excellent.

<Invention of Claim 5>
An absorbent product comprising a permeable sheet that passes through the excretory fluid, and an absorbent element that is on the back side of the permeable sheet and holds the excreted fluid,
An absorbent article, wherein the permeable sheet is a sheet mainly composed of water-repellent or hydrophobic fibers.

(Function and effect)
If the permeable sheet is hydrophilic, it is excellent in permeability in the case of urine, but if the excretory fluid that has reached the permeable sheet is, for example, loose stool, the solid content of loose stool is retained between the fibers. Thus, the liquid content in the soft stool or the solid content is also retained, and eventually the liquid content in the soft stool is also retained / residual in the permeable sheet, and it is difficult to move to the absorbent element side.

  On the other hand, when a sheet mainly composed of water-repellent or hydrophobic fibers is used as the permeable sheet, even if a lot of soft stool solids are retained between the fibers, the permeable sheet is repellent to liquids in the soft stool or solids. It is considered that the water-based or hydrophobic fibers have a function of exhibiting filterability, so that the liquid component is separated from the solid content and moves to the absorbent element side. As a result, the permeable sheet of the present invention subsequently shows a margin for accepting soft stool, and since these continuous filtration functions are exhibited, the liquid content of soft stool can be transferred to the absorbent element side quickly and quickly.

<Invention of Claim 6>
An absorbent product comprising, in order, a top sheet that passes the excretory fluid facing the skin, a permeable sheet that passes the excretory fluid, and an absorbent element that is on the back side of the permeable sheet and holds the excretory fluid. ,
An absorbent article, wherein the permeable sheet is a sheet mainly composed of water-repellent or hydrophobic fibers.

(Function and effect)
A surface sheet is provided on the surface of the transmission sheet, and the transmission sheet can be a so-called second sheet.

<Invention of Claim 7>
The absorptive article according to claim 5 or 6 in which said permeable sheet consists of an aggregate of a filament, and a filament is orientated in the surface direction of a sheet.

(Function and effect)
When the permeable sheet is composed of an aggregate of filaments and the filaments are oriented in the plane direction of the sheet, the stool is excellent in the permeability of the liquid. This reason is considered to be based on the following phenomenon. That is, in the case of a random nonwoven fabric of short fibers, there is a limit to maintaining the sheet shape even if the fiber density is high and small, and thus the solid content of soft stool is not easily transferred into the permeable sheet. On the other hand, if the aggregate is not an aggregate of short fibers but an aggregate of filaments, the solid matter of loose stool can be transferred between the filaments. Furthermore, if the orientation direction of the filament is the thickness direction as in Patent Document 2, it is difficult to transfer the liquid component to the absorbent element side unless both the solid matter and the liquid component of the soft stool pass between the filaments. However, when the filaments are oriented in the surface direction of the sheet as in the present invention, the solid content of the loose stool is retained / residual between the filaments, the filament group functions as a filter medium, and the liquid content of the loose stool is absorbed on the absorption element side. Can be migrated quickly and quickly.

<Invention of Claim 8>
The absorbent article according to claim 7, wherein the filament is spirally crimped.

(Function and effect)
When the filament is spirally crimped, the function as a filter medium is more effectively exhibited, and the liquid content of soft stool can be transferred to the absorption element side more quickly.

<Invention of Claim 9>
The said absorption element has the absorber which has cotton-like pulp as a main body, and the surface layer sheet located between this absorber and the said permeation | transmission sheet, The said surface layer sheet consists of an air through nonwoven fabric. Absorbent articles.

(Function and effect)
When an absorbent body mainly composed of cotton-like pulp is used, it is usually encased with tissue paper to maintain the shape. However, unlike urine, the stool fluid is more viscous and poorly permeable. If the surface of the absorbent body is hard for permeation of soft stool liquid, it becomes a barrier against the soft stool liquid trying to migrate from the permeable sheet, and eventually the stool is difficult for permeation through the permeable sheet. . On the other hand, according to the present invention, when an air-through nonwoven fabric is used as the surface layer sheet, the liquid component of the soft stool can permeate well and can be finally held in the absorbent body. To be. As the air-through nonwoven fabric, those made of water-repellent or hydrophobic fibers are more effective.

<Invention of Claim 10>
The absorbent article according to claim 8, wherein the surface sheet is positioned to face at least the upper surface of the absorbent body and constitutes an element that wraps the absorbent body.

<Invention of Claim 11>
The absorbent article of claim 9 or 10 wherein the basis weight of the surface layer sheet is 10 to 45 g / m ^2.

<Invention of Claim 12>
The absorptive article according to claim 11 which has superabsorbent polymer particles under the surface layer sheet in said absorption element.

(Effects of inventions of claims 10 to 12)
When the weight of the surface layer sheet is located opposite to at least the upper surface of the absorbent body and constitutes an element that wraps the absorbent body with tissue paper or crepe paper, the weight is less than 10 g / m ² It will be weak. On the other hand, when trying to increase the speed of transferring the stool liquid into the absorbent body, a high basis weight is required, but when the superabsorbent polymer particles (SAP) are contained below the surface layer sheet, the basis weight is If it exceeds 10 g / m ² , the rate of transferring the stool liquid into the absorbent body tends to be low, the denier number becomes high and coarse, the superabsorbent polymer particles permeate, and the covering is sufficient. Disappear.

<Invention of Claim 13>
The absorbent article according to claim 6, wherein the top sheet is a perforated sheet.

<Invention of Claim 14>
In the group of permeation holes for excretion liquid formed at least in the region facing the anus of the perforated sheet, the effective opening area of the single permeation hole is 3 to 75 mm ² and the opening area ratio is 10 to 80%. The absorbent article according to claim 13.

(Effects of the inventions of claims 13 and 14)
The absorbent article according to claim 6, wherein the top sheet is a perforated sheet.

<Invention of Claim 14>
The surface sheet is a perforated sheet, in particular, in the group of permeate holes for excretion formed at least in the region facing the anus, the effective aperture area of the single permeation hole is 3 to 75 mm ² , and the aperture area When a sheet made of a perforated sheet having a rate of 10 to 80% is used, it is possible to permeate the solid matter of soft stool and shift to a permeable sheet.

  As described above, according to the present invention, there are advantages such as an absorbent article excellent in soft stool absorption performance.

  Hereinafter, the embodiment of the present invention is applied to the use side of a pants-type diaper for adults and will be described in detail with an example of a disposable absorbent pad, but the present absorbent article is for adults and infants, Needless to say, the present invention can be applied to various absorbent articles such as a pants-type diaper itself and a tape-type diaper, as well as a sanitary napkin and an incontinence liner.

<Basic form>
The absorbent pad shown in FIG. 1 and FIG. 2 holds the excretory fluid on the top sheet 1 permeable to the excretory fluid facing the skin, the permeable sheet 2 permeable to the excretory fluid, and on the back side of the permeable sheet. The absorbent element 3 containing the cotton-like pulp is provided in order from the front surface side to the back surface side. Furthermore, it has barrier cuffs B and B standing on the surface side.

In the surface sheet 1, a large number of excretory fluid permeation holes H, H... Are formed at least in a region facing the anus in the embodiment. The surface sheet has an effective opening area of a single permeation hole of 3 to 75 mm ² and an opening area ratio of 10 to 80% in a group of permeation holes of excretion liquid formed at least in a region facing the anus. Those are preferably used. If the open area and the open area ratio are small, the permeability of soft stool solids will be inferior. If the open area is excessively large, the soft stool solids remaining on the surface of the permeable sheet will come into contact with the skin, causing skin irritation and A complicated skin wiping work is required. If the opening area ratio is excessively large, the strength becomes small, which is not preferable.

  The transmission sheet 2 that directly faces the top sheet 1 functions as a second sheet in the illustrated example. Details thereof will be described later.

  The absorbent element 3 that directly faces the permeable sheet 2 includes an absorbent body 3B mainly composed of cotton-like pulp that retains excretory liquid, and a surface layer sheet 3A that is positioned between the absorbent body 3B and the permeable sheet 2. Furthermore, in the embodiment, the surface layer sheet 3A constitutes an element that wraps the absorber 3B together with the forehead-wrapped tissue paper and the crepe paper 3C.

  The transmission sheet 2 is preferably made of an air-through nonwoven fabric, and details thereof will be described later.

  The back sheet 4 constituting the back side of the absorbent article is a liquid-impervious sheet in the embodiment, and is made of, for example, a plastic sheet. The back sheet 4 may have air permeability. The back sheet 4 extends from the side edge of the absorbent element 3 to the side, is folded back to reach the front surface side, forms a flap, and covers the side portion of the top sheet 1.

  A barrier sheet 5 is provided on the side of the top sheet 4, the outer side is fixed to the top sheet 4, the front end side of the inner free part is folded back, and an elastic elastic member 5 a such as thread rubber is provided on that part. Barrier cuffs B and B in which a free part stands up when worn by being fixed under the extension. In the present invention, the presence or absence of a barrier cuff is not limited, but it is desirable to provide a barrier cuff to prevent side leakage of soft stool.

  Subsequently, various other embodiments will be described. FIG. 3 shows an absorber 3B in which an upper absorber 3B1 having a narrow width and a lower absorber 3B2 having a wide width are used instead of a single-layer absorber.

  In order to maintain a large amount of the liquid component, (SAP) can be provided in a suitable portion below the surface layer sheet 3A of the absorbent element 3 for high-absorbency polymer particles. As this form, in addition to being dispersed and dispersed on the absorber 3B, it can also be dispersed in the absorber 3B. Furthermore, as shown in FIG. 4, when it is set as the two-layer structure of upper absorber 3B1 and lower absorber 3B2, superabsorbent polymer particles can be included only in lower absorber 3B2. Those indicated by ○ in the figure are superabsorbent polymer particles.

As shown in FIG. 5, the surface layer sheet 3A can be a perforated sheet. In this case, it is desirable from the viewpoint of liquid permeability that the effective opening area of a single transmission hole is 0.5 to 40 mm ² and the opening area ratio is 1 to 80%. In the case of a perforated sheet, in addition to perforating various nonwoven fabrics, a plastic sheet may be perforated.

In any case, the stool permeation rate S1 of the top sheet 1, the stool permeation rate S2 of the permeation sheet 2, and the stool permeation rate S3 of the surface layer of the absorbent element (in the case of the surface layer sheet 3A, the surface layer sheet 3A),
S1>S2> S3
It is desirable to have a relationship of

  On the other hand, as shown in FIG. 6, the surface sheet 1 can be omitted if necessary.

  Further, when the filaments of the permeable sheet are oriented in the sheet surface direction, they can be oriented in the product longitudinal direction as shown in FIG. 7A and in the product width direction as shown in FIG. 7B. . Orientation in the longitudinal direction of the product has a greater effect of allowing the stool liquid component to permeate and diffuse.

<About constituent materials>
In addition to the surface sheet described above, the material is preferably a non-woven fabric so that the skin feel is good, but a plastic sheet may be used. Examples of the shape of the opening include not only the illustrated circle but also a shape in which a large number of holes H such as an elliptical triangle, a square, a rhombus, and a hexagon are regularly or irregularly arranged. As a nonwoven fabric that can be suitably used, an air-through nonwoven fabric, a resin bond nonwoven fabric, an airlaid nonwoven fabric, a spunlace nonwoven fabric, a heat roll nonwoven fabric, a spunbond nonwoven fabric, and the like can be used. The fiber constituting the nonwoven fabric preferably has a fineness of 2 to 15 dtex, particularly 3 to 10 dtex, particularly 4 to 10 dtex, from the viewpoint of maintaining a space for absorbing soft stool and increasing permeability. As a fabric weight of a surface sheet, 5-45 g / m < ² > is desirable.

  The permeable sheet is made of a sheet mainly composed of water-repellent or hydrophobic fibers. In particular, an aggregate of filaments, for example, a sheet formed by opening a tow bundled with filaments, particularly those in which the filaments are oriented in the surface direction of the sheet, and further, the filaments are spirally crimped It is desirable that

  When a hydrophilic tow such as acetate is opened to form a sheet, the permeability of soft stool is poor. The water-repellent or hydrophobic fibers are excellent in the permeability of the soft stool, particularly the liquid, for the above-mentioned reasons. For example, in the case of an air-through nonwoven fabric of PET, the permeability of the soft stool is not sufficient. On the other hand, for example, when a sheet formed by opening a water-repellent or hydrophobic fiber tow is used as a permeable sheet, the stool liquid content is extremely excellent.

  Examples of water-repellent or hydrophobic filaments that can be suitably used include filaments of PET, PP, PE, and the like, as well as core-sheath filaments made of these.

  The fineness of the filament can be, for example, 1 to 16 denier, preferably 1 to 10 denier, and more preferably about 2 to 8 denier. The filament may be a non-crimped fiber, but is preferably a crimped fiber. The crimped degree of the crimped fiber can be, for example, 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. Further, a crimped fiber that is uniformly crimped is often used. When crimped fibers are used, a bulky and light absorbent body can be produced, and a tow with high unity can be easily produced by entanglement between the fibers. In particular, spiral crimped fibers are optimal. The cross-sectional shape of the tow constituent fibers (filaments) is not particularly limited, and may be any of circular, elliptical, irregular shapes (for example, Y-shaped, X-shaped, I-shaped, R-shaped, etc.) and hollow shapes. It may be. The filament is, for example, in the form of a tow (fiber bundle or filament bundle) formed by bundling about 3,000 to 1,000,000, preferably about 5,000 to 1,000,000 single fibers. Can be used. The tow is preferably constructed by concentrating about 3,000 to 1,000,000 filaments.

  Since the entanglement between fibers is weak, a binder having an action of adhering or fusing the contact portions of the fibers can be used mainly for the purpose of maintaining the shape. Various resin adhesives, particularly thermoplastic resins can be used.

The filament aggregate of the present invention can be produced by a known method. As described above, this representative example is a form in which filaments are converged to form a tow, and this tow is opened. The opening width of the tow is arbitrary, and can be, for example, about 100 to 2000 mm, preferably about 150 to 1500 mm. By adjusting the degree of tow opening, the density of the filament aggregate can be adjusted. The filament assembly, fiber density at the time of a thickness of 10mm is 0.0075 g / cm ³ or less, is suitable as a particularly 0.0060~0.0070g / cm ^3. If the fiber density is excessively high, the advantage of using a fiber assembly made of tow is reduced, and the liquid permeability of soft stool is lowered. Further, the basis weight of the transmissive sheet of the present invention is preferably 10 to 100 g / m ² . The basis weight of the transmission sheet can be adjusted by selecting a tow serving as a raw fabric or manufacturing conditions thereof.

  Tow opening methods include, for example, a method in which tow is spread over a plurality of opening rolls, and the tow width is gradually expanded as the tow progresses, and tow tension (elongation) and relaxation (shrinkage). And the like, and a method of widening and opening using compressed air can be used.

  FIG. 8 is a schematic view showing an example of the opening facility. In this example, the tow 31 that is the raw fabric is sequentially fed out, and in the conveying process, a widening means 32 that uses compressed air and a plurality of spread nip rolls 33, 34, and 35 whose peripheral speed is faster as the downstream roll is combined. After passing through the opened portion and widened / opened, it is passed through a binder addition box 36, and a binder is applied to form a fiber assembly 40 of filaments having a desired width and density. When applied to the absorbent article of the present invention, it may be cut into a desired shape and size.

  As the surface layer sheet of the present invention, an air-through nonwoven fabric, a resin bond nonwoven fabric, an airlaid nonwoven fabric, a spunlace nonwoven fabric, a heat roll nonwoven fabric, a spunbond nonwoven fabric, and the like can be used.

  Among air-through nonwoven fabrics, it is particularly desirable to use water-repellent or hydrophobic fibers. Examples of the water-repellent or hydrophobic fiber include fibers such as PET, PP, and PE, and fibers having a core-sheath structure using these as materials.

The basis weight of the surface layer sheet is desirably 10 to 60 g / m ² . In addition to a single layer, the surface layer sheet may be laminated in two or more layers, for example, a three-layer structure. When laminated, the basis weight in the laminated state is desirably 10 to 60 g / m ² .

  The absorbent cotton-like pulp can be produced by stacking the pulp by a known method and subjecting it to an entanglement treatment with air or water flow. Pulp fibers can be made from cellulose fibers such as chemical pulp and dissolved pulp obtained from wood, and artificial cellulose fibers such as rayon and acetate. Softwood pulp with a longer fiber length is better than hardwood pulp. It is preferably used in terms of function and price.

  A superabsorbent polymer can be contained in the absorber. Examples of the superabsorbent polymer include carboxymethyl cellulose, polyacrylic acid and salts thereof, crosslinked acrylate polymer, starch-acrylic acid graft copolymer, starch-acrylonitrile graft copolymer hydrolyzate, polyoxyethylene A cross-linked product, a cross-linked product of carboxymethyl cellulose, a partially cross-linked columnar polymer such as polyethylene oxide and polyacrylamide, or a copolymer of isobutylene and maleic acid is preferably used. What added the blocking inhibitor in order to suppress the blocking property by moisture absorption of a product can also be used. In addition, the superabsorbent polymer has various forms such as powder, particles, granules, pellets, sol, suspension, gel, film, and nonwoven fabric. Any of them can be used in the present invention, and a particulate material is particularly preferably used.

As a method of containing a superabsorbent polymer, a method of applying a powdery superabsorbent polymer to the absorber, a method of polymerizing after impregnating a monomer (what becomes a superabsorbent polymer) into the absorber Alternatively, it is possible to employ a method of performing a crosslinking treatment after coating the absorbent body with an uncrosslinked gel-like superabsorbent polymer. The basis weight of the superabsorbent polymer can be appropriately determined according to the amount of absorption required for the use of the absorber. Thus can not be said sweepingly, typically 0.03 g / cm ² or less, particularly preferably be a 0.01~0.025g / cm ^2.

  Further, instead of containing the superabsorbent polymer in the absorber, the superabsorbent polymer may be provided in a layered manner on at least one of the front surface side and the back surface side of the absorber. In particular, a superabsorbent polymer layer can be provided on the back side of the absorber. In these cases, the superabsorbent polymer can be adhered to the sheet that wraps the absorber with an adhesive. As the adhesive in this case, the aforementioned thermoplastic resin can be used.

  Moreover, an absorber can be wrapped with liquid-permeable sheets, such as a crepe paper, a nonwoven fabric, and a perforated sheet, together with a surface layer sheet. In particular, an absorbent sheet such as crepe paper is preferably used.

(Experimental example 1)
We created artificial stool for soft stool and examined the penetration rate of pseudo stool in a structure as close to the product as possible. The components of the artificial stool are as follows.
Ingredient 1. Starch (starch flour) 3%
Ingredient 2. Starch (buckwheat flour) 1.5%
Ingredient 3. And powder (aluminum silicate) 1.5%
Ingredient 4. Artificial urine 94%
Small amount of surfactant

  At the time of preparation, (1) The component 1 was added to the artificial urine of the component 4 and heated at 100 degrees with stirring to dissolve the starch. (2) The temperature of (1) was lowered to room temperature. Later, component 2 is added. (3) Component 3 is added in the same manner as (2). (4) If it is confirmed that the particles are uniformly diffused, a surfactant is added and adjusted to 28 dynes.

Now, in the absorbent pad of the form of FIG. 1 and FIG. 2, regarding the form in which the permeable sheet 2 is not provided, what material is suitable as the surface layer sheet 3A of the absorbent element was examined. As the surface sheet, a spunbond nonwoven fabric having a material weight of 35 g / m ² and having a weight per unit area of 35 g / m ² in which permeation holes for excretion fluid having a diameter of 6.3 mm are arranged in a staggered manner with a separation distance of 1.1 mm in the width direction and the longitudinal direction was used.

  In Comparative Sample 1, cotton-like pulp containing superabsorbent polymer particles was wrapped with crepe paper with a forehead roll, but the upper surface was exposed without providing a surface layer sheet. On the other hand, Comparative Sample 2 uses crepe paper as the upper layer, and Comparative Sample 3 to Comparative Sample 5 use air-through nonwoven fabric.

  For each of these comparative samples, a cylinder having a diameter of 3 inches was placed on the top sheet, and 50 cc of the artificial stool (which was colored) was continuously injected at a rate of 15 cc / sec. The absorption time was defined as the time (seconds) from the start of injection until the presence of artificial stool could not be visually confirmed. Moreover, after absorption, the quality of strike-through property was determined qualitatively. The results are shown in Table 1.

  According to Experimental Example 1, the air permeated nonwoven fabric showed good permeation / absorption retention, while the one without the surface layer sheet or the one covered with crepe paper had poor permeation / absorption retention of the soft stool liquid.

(Experimental example 2)
Experimental Example 1 shows that it is preferable to use an air-through non-woven fabric as the surface layer sheet of the absorbent element. In Experimental Example 2, after using the absorbent element in its form, An experiment was conducted to select the material. The experimental method is the same as Experimental Example 1 except that the proportion of the pseudo-soft stool component is slightly changed as follows.
Ingredient 1. Starch (starch flour) 6%
Ingredient 2. Starch (buckwheat flour) 3%
Ingredient 3. Powder (aluminum silicate) 3%
Ingredient 4. Artificial urine 88%
Small amount of surfactant

  The results are shown in Table 2.

  From the results in the table, it was found that the absorption rate of the aggregate of filaments obtained by opening hydrophilic tows and the water-repellent air-through nonwoven fabric was low. On the other hand, it was found that the water-repellent filament aggregate obtained by opening the tow of the present invention used for the permeable sheet has a remarkably fast absorption rate.

(Experimental example 3)
It was found that the surface sheets of 3 mm ² or less (including those not perforated) had poor pseudostool permeability regardless of how the opening area ratio or material was changed.

(Experimental example 4)
It has been found that, as a permeable sheet, a water-repellent and spiral-crimped filament aggregate using a tow spread has a higher absorption rate than that without the crimp.

It is a top view in the development state of the example of an absorptive article concerning the present invention. FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. 1. It is sectional drawing of another form. It is sectional drawing of another form. It is sectional drawing of another form. It is sectional drawing of the form from which an aspect differs. It is a top view in the development state of an absorptive article for explaining the orientation form of a filament. It is a schematic explanatory drawing of the toe opening method when obtaining a permeable sheet.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Surface sheet, H ... Hole of surface sheet, 2 ... Permeable sheet, 3 ... Absorbing element, 3A ... Surface layer sheet, 3B ... Absorber, 3C ... Crepe paper, 4 ... Back sheet, 5 ... Barrier sheet, B ... Barrier cuffs.

Claims (14)

An absorbent product comprising a permeation sheet that passes excretory fluid, and an absorbent element that includes a flocculent pulp that holds the excretory fluid on the back side of the permeation sheet,
The absorbent article, wherein the stool permeation rate S2 of the permeable sheet is larger than the soft stool permeation rate S3 of the surface layer of the absorbent element. Absorption comprising in order a top sheet that passes through the excrement fluid facing the skin, a permeation sheet that passes through the excretion fluid, and an absorbent element that contains the flocculent pulp that holds the excretion fluid on the back side of the permeation sheet Sex products,
The stool permeation rate S1 of the top sheet, the stool permeation rate S2 of the permeation sheet, and the stool permeation rate S3 of the surface layer of the absorbent element are:
S1>S2> S3
Absorbent article characterized by having a relationship of   The absorptive article according to claim 2 in which said surface sheet consists of a perforated sheet. In the group of permeation holes for excretion liquid formed at least in the region facing the anus of the perforated sheet, the effective opening area of the single permeation hole is 3 to 75 mm ² and the opening area ratio is 10 to 80%. The absorbent article according to claim 3. An absorbent product comprising a permeable sheet that passes through the excretory fluid, and an absorbent element that is on the back side of the permeable sheet and holds the excreted fluid,
An absorbent article, wherein the permeable sheet is a sheet mainly composed of water-repellent or hydrophobic fibers. An absorbent product comprising, in order, a top sheet that passes the excretory fluid facing the skin, a permeable sheet that passes the excretory fluid, and an absorbent element that is on the back side of the permeable sheet and holds the excretory fluid. ,
An absorbent article, wherein the permeable sheet is a sheet mainly composed of water-repellent or hydrophobic fibers.   The absorptive article according to claim 5 or 6 in which said permeable sheet consists of an aggregate of a filament, and a filament is orientated in the surface direction of a sheet.   The absorbent article according to claim 7, wherein the filament is spirally crimped.   The said absorption element has the absorber which has cotton-like pulp as a main body, and the surface layer sheet located between this absorber and the said permeation | transmission sheet, The said surface layer sheet consists of an air through nonwoven fabric. Absorbent articles.   The absorbent article according to claim 8, wherein the surface sheet is positioned to face at least the upper surface of the absorbent body and constitutes an element that wraps the absorbent body. The absorbent article of claim 9 or 10 wherein the basis weight of the surface layer sheet is 10 to 45 g / m ^2.   The absorptive article according to claim 11 which has superabsorbent polymer particles under the surface layer sheet in said absorption element.   The absorbent article according to claim 6, wherein the top sheet is a perforated sheet. In the group of permeation holes for excretion liquid formed at least in the region facing the anus of the perforated sheet, the effective opening area of the single permeation hole is 3 to 75 mm ² and the opening area ratio is 10 to 80%. The absorbent article according to claim 13.

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