JP2004329302A - Humor absorbing pad and humor absorbing article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the occurrence of a wet back in a humor absorbing pad, such as a urine absorbing pad, which is used in a state where the pad is attached to the used surface of a disposable diaper and also in a humor absorbing article. <P>SOLUTION: In the urine absorbing pad 1 in which an absorber 4 is interposed between a humor-permeable top sheet 3 and a humor-permeable back sheet 2, a sheet through which holes 3p are formed from the body side to the absorber 4 side is used as the top sheet 3. Consequently, the occurrence of wet back (a phenomenon in which a humor permeated to the absorber 4 side of the top sheet 3 returns to the body side of the sheet 3 and which is also called as the "reversion") can be prevented. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a bodily fluid absorbent pad such as a urine absorbent pad used by being attached to a use surface of a disposable diaper, and to a bodily fluid absorbent article.
[0002]
[Prior art]
As shown in FIG. 1, the urine absorbing pad is used in combination with a disposable diaper or the like having a bodily fluid absorbing and retaining ability, and is particularly used for an adult disposable diaper to facilitate care.
[0003]
Such a urine absorbing pad can be replaced frequently, but if there is a large amount of urination during a time period when the replacement interval is long, such as at night, or after infusion, leakage cannot occur because all of the urine cannot be absorbed. There is a possibility that it will.
[0004]
Therefore, an absorber is interposed between the body fluid-permeable top sheet and the body fluid-permeable backsheet, and the body fluid that cannot be absorbed by the absorber is passed through the backsheet and absorbed into a disposable diaper (hereinafter, referred to as a technology). Prior art) has been proposed.
[Patent Document 1]
JP-A-11-267145 [Patent Document 2]
JP-A-11-332899 [Patent Document 3]
JP-A-2002-85453
[Problems to be solved by the invention]
However, in the above-described prior art, there is room for improvement with respect to prevention of a so-called wet back (a phenomenon in which bodily fluid that has permeated to the absorber side of the top sheet returns to the body side of the top sheet; also referred to as reversion).
Therefore, a main object of the present invention is to prevent wet back.
[0006]
[Means for Solving the Problems]
The present invention that has solved the above problems is as described below.
<Invention according to claim 1>
In a bodily fluid absorbent pad in which an absorber is interposed between a top sheet and a bodily fluid permeable back sheet,
The bodily fluid-absorbent pad, wherein the top sheet is formed with a hole formed from the body side to the absorber side.
[0007]
(Effect)
In order to prevent wet back, it is important that the bodily fluid permeating the top sheet has an action of quickly leaving the top sheet. For this reason, in a general body fluid absorbent article having a body fluid impermeable back sheet, measures such as providing a second sheet on the absorber side surface of the top sheet or providing a gap have been proposed.
[0008]
However, in the form in which the unabsorbable bodily fluid is transmitted through the backsheet and absorbed by an external article as in the above-described prior art, for some time, the unabsorbable bodily fluid exists between the topsheet and the backsheet. . Therefore, when processing a large amount of bodily fluids, it is difficult to quickly isolate bodily fluids from the top sheet, even if a well-known technique such as providing a second sheet is applied.
[0009]
This means that in order to prevent wet-back in the urine absorption pad as in the above prior art, it is very important to quickly supply unabsorbable body fluid to an external absorbent article. .
[0010]
Thus, the present inventors have conducted intensive studies on the ease with which the backsheet permeates bodily fluids, and as a result, the bodily fluid held by the topsheet prevents air from flowing into the space between the topsheet and the backsheet. The present inventors have found that the permeation of bodily fluids through a sheet is impaired, and have accomplished the present invention.
[0011]
That is, according to the present invention, since the top sheet is a perforated sheet in which holes leading from the body side to the absorber side are formed and formed, the holes ensure the flow of air between the top sheet and the back sheet. This makes it difficult for the body fluid to pass through the back sheet. Therefore, the bodily fluid that cannot be completely absorbed by the absorber is promptly supplied to the outside, and is isolated from the top sheet. As a result, wet back hardly occurs.
[0012]
<Invention according to claim 2>
2. The body fluid absorbent pad according to claim 1, wherein the absorbent has a liquid passage time of less than 8 seconds when 150 cc of artificial urine passes through a circular portion having a diameter of 7 mm. 3.
[0013]
(Effect)
As described above, the present invention is intended to prevent wet back by promoting body fluid permeation through the back sheet, and therefore, an absorbent having an excellent liquid permeability as described in claim 2 is preferable. It is. If the liquid passing time specified in the present invention exceeds 8 seconds, there is a long remaining time on the absorber surface before reversing, and there is discomfort.
[0014]
<Invention of Claim 3>
The body fluid absorbent pad according to claim 1 or 2, wherein the top sheet has a hydrophilic body side surface and a water repellent or hydrophobic body side surface.
[0015]
(Effect)
In such a top sheet, although the passage of bodily fluids from the body side to the absorber side is performed smoothly and quickly, on the contrary, the passage of bodily fluids from the absorber side to the body side is difficult. By combining with the core action, the effect of preventing wet back can be further improved.
[0016]
<Invention of Claim 4>
The bodily fluid absorbent pad according to any one of claims 1 to 3, wherein the absorbent includes a highly absorbent polymer having a capillary suction force of 0.8 g or more.
[0017]
(Effect)
In products, the fibers in contact with the superabsorbent polymer have a significant effect on the absorption of the superabsorbent polymer. That is, the superabsorbent polymer in the bodily fluid absorbent article constitutes an absorbent body together with the fiber, or is in contact with the surrounding fiber member even if it is present alone. The supply of bodily fluids is performed either directly to the polymer or via a fiber. The latter has a significant influence on the absorption capacity and diffusibility of bodily fluids. If it is difficult to transfer the bodily fluid from the fiber to the polymer, the bodily fluid held by the fiber impedes the movement of other bodily fluids, so that the diffusivity is reduced and, as a result, the absorption capacity is also reduced.
[0018]
The capillary suction force according to the fourth aspect represents the ability to absorb body fluid from the fiber. When a high-absorbency polymer having a capillary suction force of 0.8 g or more is used, the original ability of the high-absorbency polymer is sufficient. And the absorption performance as a product is improved.
[0019]
Here, the “capillary suction force” in the present invention is an absorption amount per a predetermined time measured by a capillary suction force test determined by the following procedures (1) to (6), and the high-absorbent polymer is converted from fibers. It is an indicator of the ability to absorb body fluids.
{Circle around (1)} A 5 mm thick acrylic plate having a linear edge having a length of 40 mm or more is prepared, horizontally supported, and a container is placed below the linear edge.
{Circle around (2)} No. forming a rectangle of 80 mm length × 40 mm width. (2) Prepare filter paper, fold the filter paper at right angles along the longitudinal center line, place one part from the folding line on the acrylic plate, and place the other part from the folding line on the acrylic plate straight line. From the edge of the shape vertically downward into the container. At this time, the filter paper is prevented from contacting the inner wall surface of the container.
{Circle around (3)} The container is filled with artificial urine at 37 ° C., and the lower 20 mm of the dripping portion of the filter paper is immersed in the artificial urine, and allowed to stand until the suction of the artificial urine by the filter paper becomes saturated.
{Circle around (4)} A support material having a square shape with a length of 20 mm and a width of 20 mm is prepared, and one side surface thereof has a high absorbency of 0.15 g via a water-repellent hot melt adhesive applied at a basis weight of 20 g / m ² . The polymer is deposited uniformly to form a test specimen.
{Circle around (5)} The test piece is placed on one side of the filter paper placed on an acrylic plate, with the surface on which the superabsorbent polymer is attached facing downward. At this time, the center line in the width direction of the test piece is aligned with the center line in the width direction on one side of the filter paper, and one side of the test piece is separated from the bending line of the filter paper by 5 mm.
{Circle around (6)} At 30 minutes after the test piece was placed on the filter paper, the amount of artificial urine sucked from the container was measured, and the value converted to the weight was defined as the capillary suction force.
[0020]
<Invention according to claim 5>
The bodily fluid-absorbent pad according to claim 1, wherein the backsheet has a liquid passage time of 150 cc of artificial urine passing through a circular portion having a diameter of 7 mm for 5 to 8 seconds.
[0021]
(Effect)
As described above, since the present invention is to prevent wet back by promoting body fluid permeation through the back sheet, the back sheet preferably has excellent liquid permeability as described in claim 5. It is. If the liquid passing time specified in the present invention is less than 5 seconds, the absorption amount by the pad may be reduced, and the absorption by the pad may be complemented. Demonstrated, but weakened.
[0022]
<Invention of claim 6>
In an absorbent body that can absorb bodily fluids, in a bodily fluid absorbent article having a top sheet on a side of the absorbent body that contacts the body,
The body fluid-absorbent article, wherein the top sheet has a body side surface having hydrophilicity and an absorber side surface having water repellency or hydrophobicity, and having a hole formed from the body side to the absorber side. .
[0023]
(Effect)
In such a bodily fluid absorbent article, although the top sheet smoothly and rapidly passes the bodily fluid from the body side to the absorber side, on the other hand, the passage of the bodily fluid from the absorber side to the body side becomes difficult. Can be effectively prevented.
[0024]
<Invention of claim 7>
The body fluid absorbent article according to claim 6, wherein the absorbent body contains a highly absorbent polymer having a capillary suction force of 0.8 g or more.
[0025]
(Effect)
As described above, when it is difficult to transfer bodily fluid from the fiber to the polymer, the bodily fluid held by the fiber impedes the movement of other bodily fluids, resulting in reduced diffusivity and, consequently, reduced absorption capacity. As described in claim 7, when a high-absorbency polymer having a capillary suction force of 0.8 g or more is used, the original ability of the high-absorbency polymer is sufficiently exhibited and the absorption performance as a product is improved. Further improves the wet back prevention effect.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION
The application of the present invention to a urine absorbing pad will be described in detail, but the present invention is not limited to the urine absorbing pad as long as the body fluid is sent to the outside via a back sheet.
[0027]
1 and 2 show a urine absorbing pad example 1 to which the present invention is applied. The pad 1 includes a liquid-permeable top sheet (surface material) 3 that allows body fluids such as urine to permeate quickly, a liquid-permeable back sheet (back material) 2, and a body fluid provided between these two sheets 2 and 3. An absorbent body 4 that absorbs and retains the fluid is interposed, and the body fluid that cannot be absorbed by the absorbent body 4 is transmitted to the outside through a liquid-permeable back sheet.
[0028]
As the liquid-permeable backing sheet 2, a nonwoven fabric having excellent liquid permeability, an olefin-based resin sheet such as polyethylene or polypropylene provided with a large number of body fluid permeation holes, or a laminated nonwoven fabric obtained by laminating a nonwoven fabric thereon can be used. In particular, it is preferable that an artificial urine pass 150 cc through a circular portion having a diameter of 7 mm so that the flow time is in the range of 5 to 8 seconds.
[0029]
As shown in FIG. 3, the liquid passing time was measured using a measuring container 10 having a circular hole having a diameter of 7 mm on the bottom surface, and a sample (in this case) absorber 4 fixed on the outer surface of the bottom surface. It can be measured by placing 150 cc of human urine U and measuring the time until the entire amount of the human urine U has passed through the absorber 4.
[0030]
As the liquid-permeable top sheet 3, a known material such as a nonwoven fabric or a porous plastic sheet can be used as long as the holes 3p communicating from the body side to the absorber 4 side are formed, but a nonwoven fabric is preferable. . Examples of the nonwoven fabric used for the top sheet 3 include synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, as well as regenerated fibers such as rayon and cupra and natural fibers such as cotton by a spunlace method, It can be manufactured by an appropriate processing method such as a bonding method, a thermal bonding method, a melt blown method, and a needle punch method.
[0031]
The size of the hole 3p in the top sheet 3 of the present invention may be appropriately determined, but the area of one hole 3p is preferably 0.3 to ⁴ mm ² , and the area occupied by the hole 3p in the sheet is the entire area. Is preferably 5 to 30%. If the area of the holes 3p is 0.3 mm ² or less, or if the area occupied by the holes 3p in the sheet is less than 5%, it is difficult to ensure liquid permeation and air permeability, and the hole area is 4 mm ² or more. In addition, it is difficult to prevent wet back in which the occupied area is 30% or more.
[0032]
Further, the top sheet 3 of the present invention preferably has a body side surface having hydrophilicity and an absorber side surface having water repellency or hydrophobicity. When a single-layer nonwoven fabric is used, the top sheet 3 having such characteristics can be formed by subjecting only the surface on the absorber 4 side to silicon processing or fluorine processing, and uses a multi-layer (including laminated nonwoven fabric) nonwoven sheet. In this case, in addition to performing the water repellent treatment on the surface on the absorber 4 side, the layer on the absorber 4 side can be formed by using hydrophobic fibers or fibers subjected to a water repellent treatment.
[0033]
As the absorber 4, for example, a known material formed of fluff pulp and a highly absorbent polymer can be used. The superabsorbent polymer can be mixed into the pulp constituting the absorber 4 as, for example, a powder, and can be held on the surface of the absorber 4 or fixed by polymerization on the fiber surface. Examples of pulp include cellulose fibers such as chemical pulp obtained from wood and dissolved pulp, and artificial cellulose fibers such as rayon and acetate. Softwood pulp having a longer fiber length than hardwood pulp has higher function and price. It is preferably used in terms of.
[0034]
As the absorbent body 4 of the present invention, it is preferable that the absorbent 4 have a liquid passage time of 5 to 8 seconds in which 150 cc of artificial urine passes through a circular portion having a diameter of 7 mm. The absorbent 4 having excellent liquid permeability can be reduced in thickness without changing the density of the absorbent 4 itself, or a highly absorbent polymer having excellent liquid permeability, for example, JP-A-2000-273107 and JP-A-2000-273107. It can be formed by using those disclosed in JP-A-2001-2935.
[0035]
Examples of the type of superabsorbent polymer used for the absorber 4 include those that absorb and retain bodily fluids having a weight of, for example, 20 times or more, specifically, starch-based, cellulosic, and synthetic polymer-based polymers. Yes, starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, cross-linked sodium carboxymethylcellulose, acrylic acid (salt) polymer and the like can be mentioned.
[0036]
As the superabsorbent polymer, it is desirable to use one having a capillary suction force of 0.8 g or more, particularly 1.2 g or more. Incidentally, the capillary suction force of the superabsorbent polymer generally used conventionally is 0.7 g or less. Capillary suction has a strong relationship with swelling behavior during body fluid absorption. That is, if the absorption rate is too high, voids are generated in the swollen superabsorbent polymer layer, and the capillary suction force decreases. Therefore, for a highly absorbent polymer with a capillary suction force of 0.8 g or more, the absorption rate should be moderate, and the particle size distribution should be sharp (close to monodisperse) to ensure uniformity of the particle gap. Can be manufactured. The superabsorbent polymer may be a pulverized type, but from the viewpoint of particle size uniformity, cluster particles obtained by the inverse suspension emulsion polymerization method are preferred.
[0037]
In the capillary suction test described above, specifically, as shown in FIGS. 4 and 5, a burette 20 and a container 21 are prepared, and a burette 20 tip opening supported vertically and a bottom opening of the container 21 are provided. Are communicated by a flexible tube 22, and a 50 mm × 50 mm × 5 mm thick square acrylic plate 23 is horizontally supported, and a linear edge 23 e of one side of the acrylic plate 23 is separated substantially above the center of the container 21. The test can be performed by the following procedures (a) to (e) using a test apparatus arranged in such a manner.
[0038]
(A) No. forming a rectangle of 80 mm length × 40 mm width. 2. A filter paper 30 is prepared, the filter paper 30 is bent at a right angle along a center line in the longitudinal direction, a portion 31 on one side from the bending line is placed on the acrylic plate 23, and a portion 32 on the other side from the folding line is placed. From the straight edge 23e of the acrylic plate 23 in the container 21 vertically downward. At this time, the filter paper 30 is prevented from contacting the inner wall surface of the container 21.
[0039]
(B) in artificial urine U (100 g of 37 ° C. in the container _{21, NH 2 CONH 2 ... 2.00g} , NaCl ... 0.80g, MaSO 4 · 2H 2 O ... 0.08g, CaCl 2 · 2H 2 O 0.03 g, ion-exchanged water 97.09 g), the lower half 32 u (20 mm) of the hanging part 32 of the filter paper 30 is immersed in the artificial urine U, and the filter paper 30 sucks up the artificial urine U and saturates it. Until the filter paper 30 is completely wetted by the artificial urine and the suction does not proceed any more, specifically in the case of the present test apparatus, the drop of the liquid level f in the burette due to the suction of the artificial urine U stops. And let stand for 1 minute. It takes about 12 to 15 minutes to reach the saturated state. After the saturation, the scale value of the liquid level f in the buret is recorded.
[0040]
(C) On the other hand, using a non-woven fabric sheet (polyester spun-bonded non-woven fabric, basis weight 18 g / m ² ), a support member 41 having a square shape having a length of 20 mm and a width of 20 mm is prepared. An adhesive (ME117 manufactured by NSC Japan, Ltd.) applied with a basis weight of 20 g / m ² was pressed against a flat surface of a superabsorbent polymer powder placed in a bat to a thickness of 0.5 cm, and a support material was applied. A test piece 40 is formed by uniformly adhering 0.15 g of the superabsorbent polymer p to the entire one side surface of the sample 41.
[0041]
(D) The test piece 40 is placed on one side of the filter paper 30 placed on the acrylic plate 23 with the surface on the side where the superabsorbent polymer p is attached facing downward. At this time, as shown in FIG. 6, the center line in the width direction of the test piece 40 is aligned with the center line in the width direction on one side of the filter paper 30, and one side of the test piece 40 is separated from the bending line of the filter paper 30 by 5 mm.
[0042]
(E) At 30 minutes after the test piece 40 was placed on the filter paper 30, the scale value of the liquid level f in the buret was read, and the graduation value of the liquid level f in the buret in the saturated state of the filter paper was measured beforehand. The amount of the artificial urine sucked up from the container 21 by the suction force of the superabsorbent polymer p is calculated from the scale value, and the value converted into the weight is defined as the capillary suction force.
[0043]
On the other hand, in the present invention, as shown in the figure, a second sheet 5 having a higher body fluid permeation speed than the top sheet 3 can be interposed between the top sheet 3 and the absorber 4. The present invention is based on preventing wet back by combining the perforated top sheet 3 and the liquid-permeable back sheet 2, but the quality of the effect is irrelevant to the function of the second sheet 5, By incorporating the second sheet 5, the bodily fluid received by the top sheet 3 quickly penetrates into the second sheet 5, so that the effect of preventing wet back can be further improved.
[0044]
As the second sheet 5 satisfying this function, a sheet having a fiber density smaller than that of the top sheet 3 can be used. Further, since the second sheet 5 does not directly contact the skin, a sheet made of short fiber non-woven fabric can be used. Further, as the second sheet 5, a mesh-like film, a perforated nonwoven fabric, or the like can be used. The second sheet 5 may include a water retention fiber. Examples of the water-retentive fibers include fibers such as rayon and cellulose derivatives, which can be woven into other materials. The hydrophilic agent can be added to the second sheet 5. Examples of the material of the nonwoven fabric include polypropylene, polyethylene, polyethylene terephthalate, polyamide, nylon, rayon, vinylon, and acrylic. it can. The short fibers may be joined by a wet method, a dry method (air lay method or card method), a spunlace method, or the like, and a form in which they are point-bonded by heat or an adhesive, or entangled by a stream of water or a needle. Non-woven fabrics composed of conjugate fibers having a core / shell or side-by-side structure can also be mentioned. Examples of the conjugate fibers include polyethylene terephthalate / polyethylene, polypropylene / polyethylene, and polypropylene / polypropylene.
[0045]
On the other hand, in the present embodiment, the side nonwoven fabrics 6 and 6 are provided along the longitudinal direction and substantially over the entire length, respectively, on both sides of the surface of the pad 1. A part 6b is extended laterally, a part of the liquid-impervious back sheet 2 is extended laterally, and the side nonwoven fabric 6 part extending laterally and the liquid-impermeable back surface The sheet 2 is joined with a hot melt adhesive or the like.
[0046]
As the side non-woven fabric 6, a water-repellent non-woven fabric or a hydrophilic non-woven fabric can be used depending on the function to be regarded as important. For example, if importance is placed on functions such as preventing urine permeation or enhancing the feeling of touch, use a water-repellent nonwoven fabric coated with a silicon-based, paraffin-based, alkylchromic chloride-based water-repellent agent, and the wing shape. If emphasis is placed on the absorbability of menstrual blood and the like in the overhang portions W, W, a method in which a compound having a hydrophilic group, for example, an oxidation product of polyethylene glycol is polymerized in the process of producing synthetic fibers, Hydrophilic treatment with a metal salt such as tin, partially dissolving the surface to make it porous, making the synthetic fiber swell or porous by depositing metal hydroxide, etc. Use a treated nonwoven fabric. It is desirable to use a hydrophilic nonwoven fabric as the side nonwoven fabric 6. As the side nonwoven fabric 6, a material formed by using a natural fiber, a synthetic fiber, a recycled fiber, or the like as a raw material by an appropriate processing method can be used. It is preferable to use a nonwoven fabric.
[0047]
The side non-woven fabrics 6, 6 have a double sheet structure, and an inner portion 6C extends toward the center in the width direction from the side edge of the absorbent core 4, and has elasticity such as thread rubber between the double sheets at the tip. The elastic members 6A, 6A are adhered in a stretched state by a hot melt adhesive. The front and rear ends of the side nonwoven fabric 6 in the longitudinal direction are adhered to the surface of the top sheet 3, but the intermediate portion is not adhered. Therefore, in the use state, the folded portion stands up due to the contraction force of the elastic elastic members 6A, 6A, and functions as a side leakage prevention barrier.
[0048]
(Functional features)
The absorbent pad 1 thus configured is used, for example, as shown in FIGS. 6 and 7, disposed on the use surface side of the disposable diaper 50 and overlapped with the absorbent 54 of the disposable diaper. The illustrated disposable diaper 50 has an absorbent body 54 interposed between a liquid-permeable top sheet 53 and a liquid-impermeable back sheet 54, and has a side leakage prevention barrier 56 on both sides similarly to the absorbent pad 1. , 56 are formed, the outer surface of the liquid-impervious back sheet 54 is covered with an exterior sheet 55 such as a nonwoven fabric, and a tape fastening type for fastening fastening tapes 57 provided on both sides on the back side to the outside surface on the abdomen side. It is a diaper. Since these configurations are too well-known, their description is omitted here. Of course, the absorbent pad 1 of the present embodiment can be used for a disposable diaper of another configuration or another body fluid absorbent article.
[0049]
In the embodiment shown in FIGS. 6 and 7, the bodily fluid excreted in the zone Z from the body passes through the top sheet 3 and the second sheet 5 of the pad 1 in order and is absorbed by the absorber 4. On the other hand, the bodily fluid that cannot be completely absorbed by the absorber 4 is supplied to the paper diaper 50 on the outside through the back sheet 2 and is absorbed by the absorber 54 of the diaper 50. At this time, the flow of air between the top sheet 3 and the back sheet 2 is ensured by the holes 3p formed in the top sheet 3 of the absorbent pad 1, and the permeation of bodily fluid through the back sheet 2 is promoted. Therefore, the bodily fluid that cannot be completely absorbed by the absorber 4 is promptly supplied to the external disposable diaper 50 and is isolated from the top sheet 3, so that wet back hardly occurs.
[0050]
Therefore, from the function of the present invention, as described above, as the absorbent 4 of the absorbent pad 1 and the back sheet 2, 150 cc of artificial urine passes through a circular portion having a diameter of 7 mm, and the liquid passing time is 5 to 8 seconds. Those having excellent properties are preferred.
[0051]
However, even if the permeation of bodily fluids through the backsheet 2 can be promoted, bodily fluids that are not temporarily absorbed exist between the topsheet 3 and the backsheet 2. Therefore, in order to improve this point, the top sheet 3 is configured such that the body side surface has hydrophilicity, and the absorber 4 side surface has water repellency or hydrophobicity. It is preferable that the top sheet 3 hardly returns to the body side due to water repellency or hydrophobicity. In addition, it is preferable that the body fluid is smoothly and quickly transferred to the absorber by using the absorber 4 having a highly absorbent polymer having a capillary suction force of 0.8 g or more.
[0052]
(Other embodiments according to the present invention)
On the other hand, the top sheet whose body side surface is hydrophilic and whose absorber side surface has water repellency or hydrophobicity is not only an absorbent pad, but also an absorbent body capable of absorbing body fluid, and a side of the absorbent body in contact with the body. Even when applied to a body fluid absorbent article having a top sheet, there is a remarkable effect of preventing wet back. In this case, it is particularly preferable that the absorbent contains a highly absorbent polymer having a capillary suction force of 0.8 g or more. In addition, the structure of the above-mentioned absorbent sheet such as the second sheet can be suitably applied in this case.
[0053]
【Example】
A urine absorption pad provided with a top sheet having holes formed in a body fluid permeable material and a back sheet made of a body fluid permeable material and having no holes (Example); a top sheet having no holes and a back sheet having body fluid impermeability; A urine absorption pad (conventional example) made of the above material was manufactured, and a test for confirming the effect of preventing wet back was performed. Conditions not specified were common to each example.
[0054]
The confirmation test was performed as follows.
{Circle around (1)} The pad was placed flat on a 15-degree inclined plate assuming an inclination when worn on the body, and fixed in such a manner that the longitudinal direction of the pad was aligned with the vertical direction of the inclination.
(2) Using a pipette, inject artificial urine at a speed of 15 cc / sec for 10 seconds into the center of the pad at a distance of 100 mm from the upper end of the pad to the center side, and immediately thereafter, remove the entire top sheet of the pad. Five filter papers were arranged so as to cover them, and a 5 kg weight was placed on the entire upper surface so that pressure was applied.
{Circle around (3)} At a point in time after the weight was placed on the paper, the weight was removed, and the weight of the artificial urine transferred to the filter paper was measured to determine the wet-back amount. The wet-back amount was determined by measuring the weight of the filter paper in advance and subtracting this from the weight of the filter paper after absorbing artificial urine.
[0055]
FIG. 8 shows the measurement results. It was confirmed that the example according to the present invention was superior to the conventional example in the effect of preventing wet back.
[0056]
【The invention's effect】
As described above, according to the present invention, wet back can be effectively prevented.
[Brief description of the drawings]
FIG. 1 is a plan view showing an example of an absorbent pad according to the present invention.
FIG. 2 is a sectional view taken along line II-II of FIG.
FIG. 3 is a schematic diagram of a capillary suction force test device.
FIG. 4 is a schematic view showing an example of a test device used for a capillary suction force test.
FIG. 5 is a plan view showing a mounting position of a test piece.
FIG. 6 is a plan view showing a state in which an absorbent pad is disposed on a use surface of the disposable diaper.
FIG. 7 is a sectional view taken along line VII-VII of FIG. 6;
FIG. 8 is a graph showing test results.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... urine absorption pad, 2 ... back sheet, 3 ... top sheet, 3p ... hole, 4 ... absorber, 5 ... second sheet.

Claims (7)

In a bodily fluid absorbent pad in which an absorber is interposed between a top sheet and a bodily fluid permeable back sheet,
The bodily fluid-absorbent pad, wherein the top sheet is formed with a hole formed from the body side to the absorber side. 2. The body fluid absorbent pad according to claim 1, wherein the absorbent has a liquid passage time of less than 8 seconds when 150 cc of artificial urine passes through a circular portion having a diameter of 7 mm. 3. The body fluid absorbent pad according to claim 1 or 2, wherein the top sheet has a hydrophilic body side surface and a water repellent or hydrophobic body side surface. The bodily fluid absorbent pad according to any one of claims 1 to 3, wherein the absorbent includes a highly absorbent polymer having a capillary suction force of 0.8 g or more. The bodily fluid absorbent pad according to any one of claims 1 to 4, wherein the backsheet has a fluid passage time of 150 cc of artificial urine passing through a circular portion having a diameter of 7 mm for 5 to 8 seconds. In an absorbent body that can absorb bodily fluids, a bodily fluid absorbent article having a top sheet on a side of the absorbent body that contacts the body
The body fluid-absorbent article, wherein the top sheet has a body side surface having hydrophilicity and an absorber side surface having water repellency or hydrophobicity, and having a hole formed from the body side to the absorber side. . The body fluid absorbent article according to claim 6, wherein the absorbent body contains a highly absorbent polymer having a capillary suction force of 0.8 g or more.

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