JP4266685B2 - Body fluid absorbent article - Google Patents

Description

【００３８】
（考察）
上記結果から、吸収体若しくは体液吸収性物品の吸収性能を考える場合、高吸収性ポリマーと繊維との相関が如何に重要であるかが判る。
【００３９】
また、上記結果は、吸収体若しくは物品としての吸収性能を直接表したものではないが、ろ紙層と高吸収性ポリマーとからなる部分は前述の吸収体における高吸収性ポリマーとこれに接触する拡散層、吸収紙若しくは表面層との関係に近似できるものであり、この吸収性能が吸収体若しくは体液吸収性物品における性能と直接的な相関を有することは明らかである。さらに毛管吸引力は所定時間あたりの体液吸収量であるものの、計測した体液吸収量の経時変化をみれば、拡散性および吸収量がどの程度のものであるかは評価でき、この観点から表１に示される結果を見ると、毛管吸引力が１．２ｇ以上の高吸収性ポリマーを用いれば吸収性能が著しく向上することは容易に予測される。
【００４０】
＜試験２：吸収特性試験＞
上記考察を踏まえ、吸収体としての特性を確認するべく次のような試験を行った。
【００４１】
（供試体）
図７に示すように、上層ＵＬとしてのパルプシート（重量８ｇ）、中層ＭＬとしての拡散シート、および下層ＬＬとしての高吸収性ポリマーシート（不織布（ポリエステルスパンボンド不織布、坪量１８ｇ／ｍ²）の表面にホットメルト接着剤を用いて高吸収性ポリマーを目付け２５０ｇ／ｍ²で付着させた形態）を一体化した吸収体（長さ２００ｍｍ×幅４００ｍｍ）を製造し、これを供試体とした。なお、高吸収性ポリマーシートＬＬはポリマー付着側面を拡散シートＭＬと接触するように配置した。また、高吸収性ポリマーは毛管吸引力試験で用いた４種類とし、高吸収性ポリマー以外は共通の構成とした。
【００４２】
（試験方法）
図８に示すように、水平面に対して１５度の角度をなす平坦な傾斜面ＳＦ上に供試吸収体ＡＢを配置し、その長手方向を傾斜面ＳＦに沿う高さ方向に合わせて固定する。しかる後、供試体ＡＢの上端から１００ｍｍ離間した幅方向中央位置に、ピペットを用いて人孔尿Ｕを注入する。この注入は１０分間隔で３回行い、注入量は１回あたり５０ｃｃとする。注入後の状態を、○：もれずに吸収される、△：供試体下端ぎりぎりまで濡れる、×：供試体下端から漏れ出る、の三段階で評価し、供試体下端から漏れ出た場合にはその漏出量を計測する。
【００４３】
（試験結果）
表２に、高吸収性ポリマーの種類および試験結果を示す。前述の毛管吸引力試験の考察で予測したとおりの結果となった。
【００４４】
【表２】

【００４５】
【発明の効果】
以上のとおり本発明によれば、より確実に体液の拡散を制御でき、吸収体を十分に有効利用できるようになる。
【図面の簡単な説明】
【図１】 本発明に係る紙おむつの展開状態における表面層側平面図である。
【図２】 図１のII−II断面図である。
【図３】 図１のIII−III断面図である。
【図４】 表面層と防漏層との間の部分の、長手方向に沿う断面図である。
【図５】 毛管吸引力試験に用いる試験装置例を示す概略図である。
【図６】 試験片の載置位置を示す平面図である。
【図７】 吸収特性試験に用いた試料の概要図である。
【図８】 吸収特性試験の要領を示す概要図である。
【符号の説明】
１…使い捨ておむつ、２…表面層、３…防漏層、５…吸収体、６…拡散層。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bodily fluid absorbent article such as disposable disposable diapers and sanitary napkins that absorb bodily fluids.
[0002]
[Prior art]
The bodily fluid absorbent article has a function of absorbing and holding bodily fluids, and in general disposable paper diapers and sanitary napkins, a liquid permeable surface layer provided on the side facing the body skin, An absorbent body that absorbs and retains body fluid is provided between the anti-leakage layer provided on the side away from the skin. Various configurations have been proposed for this absorber, but in recent years most of them contain a superabsorbent polymer as an absorbent material.
[0003]
A superabsorbent polymer can absorb and retain body fluids several tens of times its own weight, and it is not an exaggeration to say that it is essential to satisfy the increase in the absorption capacity of the body fluid absorbent article. Is an important factor in the development of bodily fluid absorbent articles.
[0004]
Therefore, conventionally, in order to obtain a body fluid-absorbing article having desired absorption characteristics, the characteristics of the superabsorbent polymer have been evaluated, and the superabsorbent polymer has been selected and developed based on the characteristics. For example, conventionally, the absorption rate, the pressure absorption amount, the normal pressure absorption amount, the gel strength, the wet back, the particle size, and the liquid permeability (see Patent Document 1) of the superabsorbent polymer are evaluated, and this is expressed as a body fluid absorbability. It was used for the design of articles.
[Patent Document 1]
JP 2000-273107 A
[Problems to be solved by the invention]
However, in such a conventional design method, when actually becoming a product, the absorption performance intended at the time of development, especially the absorption capacity and the fluid diffusibility (wetting spreadability) in the portion having the high-absorbent polymer are sufficiently It is often not demonstrated. That is, the design or selection of the superabsorbent polymer is inadequate and the ability of the superabsorbent polymer is not fully exhibited.
[0006]
Then, the main subject of this invention is improving the absorption performance in the part which has a superabsorbent polymer.
[0007]
[Means for Solving the Problems]
As a result of diligent research on the improvement of the absorption performance when using a superabsorbent polymer, the present inventors have found that fibers in contact with the superabsorbent polymer have a significant effect on the absorption of the superabsorbent polymer in the product. I found out. That is, the superabsorbent polymer in the body fluid absorbent article constitutes an absorber together with the fiber, or even if it exists alone, it is in contact with the surrounding fiber member. Body fluid supply is made directly to the polymer and via fiber, and the latter in particular has a significant effect on the absorption capacity and diffusivity of the body fluid. If it is difficult to transfer the body fluid from the fiber to the polymer, the body fluid held in the fiber hinders the movement of other body fluids, so that the diffusibility is lowered, and as a result, the absorption capacity is also lowered. Therefore, even if product design is performed based on the evaluation characteristics of the superabsorbent polymer alone as in the prior art, a part of the ability of the superabsorbent polymer alone is not exhibited, and the absorption performance intended at the time of development is not sufficiently exhibited.
[0008]
The present invention has been made on the basis of such knowledge, newly taking into account the correlation with the fiber, the superabsorbent having a capillary suction force representing the ability of the superabsorbent polymer to absorb body fluid from the fiber is a predetermined value or more. By using the polymer, the original ability of the superabsorbent polymer is fully exhibited, thereby improving the absorption performance in the product.
[0009]
Specifically, in the present invention, a liquid-permeable surface layer provided on the side facing the body skin, a leak-proof layer provided on the side away from the body skin, and an absorber provided between both In a body fluid absorbent article having
The absorbent body includes a superabsorbent polymer sheet, der Rutotomoni having a provided diffusion layer between the surface layer and the superabsorbent polymer sheet, der those wrapped with absorbent paper The
The diffusion layer is a fiber aggregate sheet made of synthetic fibers having a hydrophilic surface, or both synthetic fibers and cellulosic fibers having a hydrophilic surface, and physiological saline as defined in JIS P 8141 Consisting of a fiber assembly sheet having a water absorption of Krem after 10 minutes of 100 mm or more,
The superabsorbent polymer sheet is formed by uniformly adhering to the surface of the nonwoven fabric using a hot melt adhesive so that the superabsorbent polymer powder has an apparent density of 0.60 to 0.70 g / cm ^3. Yes,
The superabsorbent polymer powder is a starch-based, cellulose-based or synthetic polymer-based superabsorbent polymer powder that can absorb and retain a body fluid 20 times or more of its own weight and has a capillary suction force of 1.2 g or more. There is also proposed a body fluid-absorbing article characterized in that the superabsorbent polymer sheet is disposed such that a polymer adhesion side surface of the superabsorbent polymer sheet is in contact with the diffusion layer.
[0010]
The body fluid-absorbing article is also proposed in which the absorbent body is formed by integrating the superabsorbent polymer sheet as a lower layer, the diffusion layer as an intermediate layer, and a pulp sheet as an upper layer.
[0011]
Furthermore, the fiber aggregate that forms the diffusion layer has a basis weight of 30 to 100 g / m ² , a fiber aggregate in which a web of rayon fibers is entangled with a water jet, or a pulp fiber is laminated on the web of rayon fibers, The body fluid absorbent article, which is a fiber assembly in which these are entangled by a water jet, is also proposed.
[0012]
Furthermore, the body fluid absorbent article is also proposed in which the nonwoven fabric of the superabsorbent polymer sheet is a polyester spunbond nonwoven fabric, and the hot melt adhesive of the superabsorbent polymer sheet is a water-repellent hot melt adhesive.
[0013]
Here, the “capillary suction force” referred to in the present invention is an absorption amount per predetermined time measured by a capillary suction force test determined by the following procedures (1) to (6), and the superabsorbent polymer is formed from the fiber. It is an indicator of the ability to absorb body fluids.
(1) An acrylic plate with a thickness of 5 mm having a straight edge with a length of 40 mm or more is prepared, this is horizontally supported, and a container is placed below the straight edge.
(2) No. which forms a rectangle with a length of 80 mm and a width of 40 mm. Prepare two filter papers, fold the filter papers at right angles along the center line in the longitudinal direction, place one part from the fold line on the acrylic plate, and place the other part from the fold line on the straight line of the acrylic plate. Drip into the container vertically downwards from the edge. At this time, the filter paper is prevented from contacting the inner wall surface of the container.
(3) Fill the container with artificial urine at 37 ° C., immerse the lower 20 mm of the hanging part of the filter paper in the artificial urine, and leave it until the suction of the artificial urine by the filter paper is saturated.
(4) A high-absorbency of 0.15 g is prepared through a water-repellent hot melt adhesive applied to a side surface of 20 g / m ² on a side surface of a support material that forms a square with a length of 20 mm and a width of 20 mm. The polymer is deposited uniformly and a test piece is formed.
(5) The test piece is placed on one side portion of the filter paper placed on the acrylic plate with the surface to 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 in the one side portion of the filter paper, and one side of the test piece is separated from the folding line of the filter paper by 5 mm.
(6) When 30 minutes have passed since the test piece was placed on the filter paper, the amount of artificial urine sucked up from the container was measured, and the value converted into the weight was taken as the capillary suction force.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
<About Absorber and Body Fluid Absorbent Article>
The present invention can be applied to general body fluid absorbent articles such as disposable paper diapers and sanitary napkins as long as it is within the range of the purpose of absorbing and holding body fluids. If an example of application to paper diapers is described, a pants-type disposable diaper or Since an embodiment using a pad-type disposable absorbent article and an embodiment using a sanitary napkin can be readily understood, the description of the latter two examples will be omitted.
[0015]
1-4 has shown Example 1 of the disposable diaper to which this invention is applied. This disposable diaper 1 is composed of a liquid-permeable non-woven sheet or a perforated film sheet provided on the side facing the body skin, a rectangular surface layer 2 that directly touches the wearer's skin, and the body skin. It has a leak-proof layer 3 made of a rectangular liquid-impervious backsheet made of a polyethylene plastic film or the like provided on the far side, and an absorber 5 containing a superabsorbent polymer provided between the two.
[0016]
Further, a flexible outer sheet 4 is provided on the rear surface side of the product, which is the rear surface side from the leak-proof layer 3, and this outer sheet 4 is laminated and fixed with one nonwoven fabric or a plurality of breathable / water-repellent nonwoven fabrics. Can be formed.
[0017]
Standing cuffs C and C are formed on both sides of the product so as to protrude toward the use surface side. The standing cuffs C are formed of a standing sheet 8 that is substantially continuous in the width direction, and made of, for example, rubber thread. It is constituted by one or a plurality of elastic members 9. More specifically, the standing cuff C is formed with the standing sheet 8 being doubled, and is formed in a state in which the elastic member 9 is wrapped and fixed by a hot melt adhesive or the like. It is desirable that the standing sheet 8 forming the standing cuffs C and C is not liquid-permeable but liquid-impermeable or hydrophobic. Moreover, you may make it become a property which repels a liquid by a silicon process etc. with respect to liquid-permeable sheets, such as a nonwoven fabric. Furthermore, it is desirable to have air permeability or vapor permeability. A liquid-impervious film sheet can be sandwiched between the upright sheets 8 to further improve leakage resistance.
[0018]
The inner surface of the double upright sheet 8 is fixed to the surface layer 2 and the outer sheet 4 with a hot melt adhesive or the like. As a result, this fixed start end of the double upright sheet 8 forms the upright end of the upright cuff C. The tip side from the standing end is a free part that is not fixed to the product body.
[0019]
The longitudinal front and rear end portions of the double upright sheet 8 are fixed to the article, specifically, to the outer surface of the surface layer 2 by a hot melt adhesive or the like with the free portion directed toward the center of the article. Yes. The space surrounded by the left and right standing cuffs C, C forms a urine or soft stool confinement space. When urinating into this space, the urine is absorbed into the absorbent body 5 through the liquid-permeable surface layer 2, and the standing cuff C becomes a barrier with respect to the solid content of loose stool, and the overpass is prevented. The
[0020]
On the other hand, at the longitudinal ends of the front body and the back body, between the nonwoven fabrics of the outer sheet 4 at the waist, a thin thread is provided with a space parallel to the edge of the waist opening in order to enhance the fit around the waist. The waist elastic members 10, 10... Made of rubber are arranged, and are fixed by hot melt adhesive or the like under expansion so that they expand and contract. The interval and the number of the waist elastic members 10, 10... Can be determined as appropriate. For example, the interval is preferably about 4 to 8 mm, and the number is preferably about 3 to 10. Reference numeral 11 denotes a tape fastener for bringing the left and right side portions on the back side into the left and right side portions on the ventral side and joining them.
[0021]
(Matters related to the present invention)
The present invention can be applied to, for example, the absorbent body 5. In this case, a superabsorbent polymer contained in the absorbent body 5 having a capillary absorbability of 1.2 g or more is used. The absorbent body 5 includes a laminated form having a fiber assembly layer and a superabsorbent polymer layer (a form in which a superabsorbent polymer is attached to the surface of a nonwoven fabric sheet or the like using a hot melt adhesive or the like as necessary. ).
[0022]
As a kind of superabsorbent polymer, what absorbs and hold | maintains a bodily fluid 20 times or more of own weight used in this kind of disposable absorbent article is used. The types of superabsorbent polymers are starch, cellulose, and synthetic polymers, such as starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, and cross-linked sodium carboxymethylcellulose. And acrylic acid (salt) polymer.
[0023]
The capillary suction force of the present invention is closely related to the swelling behavior when absorbing body fluid. That is, if the absorption rate is too high, voids are generated in the swollen superabsorbent polymer layer, and the capillary suction force is reduced. Therefore, the superabsorbent polymer having capillary suction of the present invention has a moderate absorption rate and a sharp particle size distribution (closer to monodisperse) in order to ensure uniformity of the particle gap. Can be manufactured. Such a superabsorbent polymer may be of a pulverized type, but cluster particles obtained by a reverse phase suspension emulsion polymerization method are preferred from the viewpoint of uniformity of particle size.
[0024]
Further, when the superabsorbent polymer having the capillary suction force is used, the diffusibility is improved as compared with the case where this is not used, but in order to further improve the diffusibility, the diffusion layer 6 having the humor diffusibility is provided. And provided between the surface layer 2 (or leak-proof layer 3) and the portion having the superabsorbent polymer. As this diffusion layer 6, a fiber aggregate (absorbing paper or the like) having a Krem water absorption of 100 mm or more, particularly 150 mm or more in 10 minutes according to “Water absorption test method by paper and paperboard Krem method” defined in JIS P 8141. Can be suitably used. More specifically, it consists of synthetic fibers (such as rayon fibers) that have been hydrophilized, or both synthetic fibers (such as rayon fibers) that have been hydrophilized and cellulose fibers (such as pulp fibers), and has a basis weight of A fiber assembly sheet that is 30 to 100 g / m ² , particularly 30 to 50 g / m ² , and has a Klem water absorption of 100 mm or more, particularly 150 mm or more after 10 minutes with physiological saline specified in JIS P 8141. Can be used. In particular, a fiber aggregate in which a web of rayon fibers is entangled with a water jet, or a fiber aggregate in which pulp fibers are laminated on a web of rayon fibers and entangled with each other by a water jet is preferable.
[0025]
The absorbent body 5 is wrapped with absorbent paper such as tissue paper.
[0026]
In the absorbent article thus configured, the superabsorbent polymer in the absorbent body 5 is in contact with fibers such as fluff pulp and nonwoven fabric constituting the absorbent body, fibers constituting the surface sheet, and diffusion. Since the ability to absorb body fluid from the fibers constituting the layer is high, the original absorption ability of the superabsorbent polymer is sufficiently exhibited.
[0027]
To explain by subtracting an general example Te specifically illustrated embodiment smell, after body fluid having passed through the surface layer diffused in a planar direction perpendicular to the thickness direction in the diffusion layer, the absorber containing super absorbent polymer Absorbed. That is, the superabsorbent polymer that comes into contact with the fibers of the diffusion layer 6 directly absorbs body fluid from the fibers of the diffusion layer 6, and the superabsorbent polymer in the absorber 5 is from the fibers that constitute the absorber 5. Absorb body fluids. At this time, since the superabsorbent polymer of the present invention has a high capillary suction force of 1.2 g or more, the body fluid is smoothly and continuously transferred from the fiber to the superabsorbent polymer. Therefore, the body fluid held by the fibers is less likely to inhibit the movement of other body fluids, improving the diffusibility and increasing the absorption capacity.
[0028]
(Other)
The superabsorbent polymer according to the present invention is used as a main absorbent element that covers a portion Z where an article first receives a body fluid as in the above embodiment, and other secondary absorbent elements such as sanitary napkins. It can also be used as an absorbent element provided in the flap portion.
[0029]
【Example】
<Test 1: Capillary suction test>
Capillary suction force was measured for various superabsorbent polymers shown in Table 1.
[0030]
(Test method for capillary suction)
As shown in FIG. 5, a burette 20 and a container 21 are prepared, and the distal end opening of the burette 20 supported along the vertical direction and the bottom opening of the container 21 are communicated by a flexible tube 22 and 50 mm × 50 mm × thickness. A 5 mm square acrylic plate 23 is supported horizontally, and a test apparatus in which the linear edge of one side of the acrylic plate 23 is arranged at a distance approximately above the center of the container 21 is used. According to the definition, the test was performed by the following procedures (a) to (e).
[0031]
(a) No. which forms a rectangle with a length of 80 mm and a width of 40 mm. Two filter papers 30 are prepared, the filter papers 30 are bent at right angles along the center line in the longitudinal direction, a part 31 on one side from the folding line is placed on the acrylic plate 23, and a part 32 on the other side from the folding line. Is suspended in the container 21 vertically downward from the linear edge of the acrylic plate 23. At this time, the filter paper 30 is prevented from contacting the inner wall surface of the container 21.
[0032]
(b) An artificial urine U at 37 ° C. in the container 21 (in 100 g, NH ₂ CONH ₂ 2.00 g, NaCl 0.80 g, MaSO ₄ .2H ₂ O 0.08 g, CaCl ₂ .2H ₂ O ... 0.03 g, ion-exchanged water ... 97.09 g), the lower half 32 u (20 mm) of the suspended portion 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 is saturated Specifically, in the case of this test apparatus, the decrease in the liquid level f in the burette accompanying the suction of the artificial urine U is stopped until the state (the entire filter paper 30 becomes wet with the artificial urine and the suction does not proceed further). And let stand until 1 minute later. It takes about 12 to 15 minutes to reach this saturation state. If the saturated state is reached, the scale value of the liquid level f in the burette is reserved.
[0033]
(c) On the other hand, a support material 41 having a square of 20 mm length × 20 mm width is prepared using a non-woven sheet (polyester spunbond non-woven fabric, basis weight 18 g / m ² ). An adhesive (trade name ME117 manufactured by NSC Japan) applied at a basis weight of 20 g / m ² is pressed against the flat surface of the superabsorbent polymer powder placed in a bat up to a thickness of 0.5 cm, and a support material A test piece 40 is formed by uniformly depositing 0.15 g of the superabsorbent polymer p on one side of 41.
[0034]
(d) The test piece 40 is placed on one side portion of the filter paper 30 placed on the acrylic plate 23 with the surface on which 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 in one side portion of the filter paper 30, and one side of the test piece 40 is separated from the folding line of the filter paper 30 by 5 mm.
[0035]
(e) When the test piece 40 is placed on the filter paper 30, the scale value of the burette liquid level f is read when 30 minutes have passed, and this is measured first. The amount of artificial urine sucked from the container 21 by the suction force of the superabsorbent polymer p is determined from the scale value, and the value converted into the weight is defined as the capillary suction force. In this example, the scale value of the liquid level f in the burette was kept at intervals of 5 minutes, and the amount of wicking at each stage was also measured.
[0036]
(Measurement result)
The measurement results are shown in Table 1. The capillary suction force of a superabsorbent polymer that has been generally used in the past is 0.7 g or less, which is extremely low compared to those of Examples 1 to 3 that fall within the scope of the present invention.
[0037]
[Table 1]

[0038]
(Discussion)
From the above results, it is understood how important the correlation between the superabsorbent polymer and the fiber is when considering the absorption performance of the absorbent body or the body fluid absorbent article.
[0039]
In addition, the above results do not directly represent the absorption performance as an absorbent body or article, but the portion composed of the filter paper layer and the superabsorbent polymer is a diffusion that contacts the superabsorbent polymer in the absorbent body. It can be approximated to the relationship with the layer, the absorbent paper, or the surface layer, and it is clear that the absorption performance has a direct correlation with the performance of the absorbent or body fluid absorbent article. Furthermore, although the capillary suction force is the amount of absorbed body fluid per predetermined time, it is possible to evaluate how much the diffusibility and the amount of absorption are based on changes in the measured amount of absorbed body fluid over time. From the results shown in the above, it is easily predicted that the absorption performance will be remarkably improved if a superabsorbent polymer having a capillary suction force of 1.2 g or more is used.
[0040]
<Test 2: Absorption characteristic test>
Based on the above considerations, the following tests were conducted to confirm the characteristics of the absorber.
[0041]
(Specimen)
As shown in FIG. 7, a pulp sheet (weight 8 g) as the upper layer UL, a diffusion sheet as the middle layer ML, and a superabsorbent polymer sheet as the lower layer LL (nonwoven fabric (polyester spunbond nonwoven fabric, basis weight 18 g / m ² )) An absorbent body (length 200 mm × width 400 mm) in which a superabsorbent polymer is adhered to the surface of the substrate with a weight of 250 g / m ² using a hot melt adhesive is manufactured, and this is used as a specimen. . The superabsorbent polymer sheet LL was disposed so that the polymer adhesion side surface was in contact with the diffusion sheet ML. In addition, the superabsorbent polymers were the four types used in the capillary suction test, and the same configuration was used except for the superabsorbent polymer.
[0042]
(Test method)
As shown in FIG. 8, the test absorber AB is arranged on a flat inclined surface SF that forms an angle of 15 degrees with respect to the horizontal plane, and the longitudinal direction thereof is fixed in accordance with the height direction along the inclined surface SF. . After that, the human urine U is injected into the center position in the width direction 100 mm away from the upper end of the specimen AB using a pipette. This injection is performed three times at 10-minute intervals, and the injection amount is 50 cc per time. The state after injection is evaluated in three stages: ○: absorbed without leaking, △: wets to the very bottom of the specimen, x: leaks from the bottom of the specimen, and when leaking from the bottom of the specimen The amount of leakage is measured.
[0043]
(Test results)
Table 2 shows the types of superabsorbent polymers and the test results. The results were as predicted in the discussion of the capillary suction test described above.
[0044]
[Table 2]

[0045]
【The invention's effect】
As described above, according to the present invention, the diffusion of body fluid can be controlled more reliably, and the absorber can be used sufficiently effectively.
[Brief description of the drawings]
FIG. 1 is a plan view of a surface layer side in a developed state of a disposable diaper according to the present invention.
2 is a cross-sectional view taken along the line II-II in FIG.
3 is a cross-sectional view taken along the line III-III in FIG.
FIG. 4 is a cross-sectional view along the longitudinal direction of a portion between a surface layer and a leak-proof layer.
FIG. 5 is a schematic view showing an example of a test apparatus used for a capillary suction test.
FIG. 6 is a plan view showing a mounting position of a test piece.
FIG. 7 is a schematic view of a sample used in an absorption characteristic test.
FIG. 8 is a schematic diagram showing a procedure for an absorption characteristic test.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Disposable diaper, 2 ... Surface layer, 3 ... Leak-proof layer, 5 ... Absorber, 6 ... Diffusion layer.

Claims (4)

In a body fluid absorbent article having a liquid permeable surface layer provided on the side facing the body skin, a leak-proof layer provided on the side away from the body skin, and an absorbent provided between the two,
The absorbent body includes a superabsorbent polymer sheet, der Rutotomoni having a provided diffusion layer between the surface layer and the superabsorbent polymer sheet, der those wrapped with absorbent paper The
The diffusion layer is a fiber aggregate sheet made of synthetic fibers having a hydrophilic surface, or both synthetic fibers and cellulosic fibers having a hydrophilic surface, and physiological saline as defined in JIS P 8141 Consisting of a fiber assembly sheet having a water absorption of Krem after 10 minutes of 100 mm or more,
The superabsorbent polymer sheet is formed by uniformly adhering to the surface of the nonwoven fabric using a hot melt adhesive so that the superabsorbent polymer powder has an apparent density of 0.60 to 0.70 g / cm ^3. Yes,
The superabsorbent polymer powder is a starch-based, cellulose-based or synthetic polymer-based superabsorbent polymer powder that can absorb and retain a body fluid 20 times or more of its own weight and has a capillary suction force of 1.2 g or more. And a body fluid-absorbing article, wherein the polymer adhering side surface of the superabsorbent polymer sheet is disposed so as to be in contact with the diffusion layer. The body fluid absorbent article according to claim 1, wherein the absorbent body is formed by integrating the superabsorbent polymer sheet as a lower layer, the diffusion layer as an intermediate layer, and a pulp sheet as an upper layer. The fiber aggregate forming the diffusion layer is a fiber aggregate in which a web of rayon fibers having a basis weight of 30 to 100 g / m ² is entangled by a water jet, or a pulp fiber is laminated on a web of rayon fibers, The bodily fluid absorbent article according to claim 1 or 2, wherein the article is a fiber assembly entangled by a water jet. The nonwoven fabric of the said superabsorbent polymer sheet is a polyester spunbond nonwoven fabric, The hot melt adhesive of the said superabsorbent polymer sheet is a water-repellent hot-melt adhesive agent of any one of Claims 1-3. Body fluid absorbent article.

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