JP3860554B2 - Absorbent articles - Google Patents

Description

【００４２】
図６は横軸をエンボスピッチ(mm)、縦軸をはりつき試験(秒)としたグラフである。同図からエンボスピッチが５mmを超えたところから曲線が急激に上昇していることが分かる。エンボスピッチと接触面積との間にはエンボスピッチが大きくなると接触面積が大きくなるという正比例の相関があり、同グラフからエンボスピッチを５mm以上とすることにより接触面積の増大により吸液性を上げ、体液が表面に残らないようにすることが可能であるため、前記第１領域８におけるエンボス間隔は５mm以上とするのが望ましいことが判明した。
【００４３】
また、図７は横軸をエンボスピッチ(mm)、縦軸をべた付き試験(ｇ)としたグラフである。同図からエンボスピッチが５mmを超えたところから曲線が急激に下降していることが分かる。エンボスピッチと高低差との間にはエンボスピッチが大きくなると拘束が小さくなり高低差が大きくなるという正比例の相関があり、同グラフからエンボスピッチを５mm以上とすることにより高低差の増大によりべた付き感を急激に減少させることが可能であるため、前記第１領域８におけるエンボス間隔は５mm以上とするのが望ましいことが判明した。
【００４４】
【発明の効果】
以上詳説のとおり本発明によれば、吸液性、ドライタッチ感等のメッシュシートによる利点を生かしながら、肌触り感の改善や吸液後における逆戻り防止、貼り付き感の低減を図ることができ、表面シートに要求されるすべての機能をバランス良く満足させることが可能となる。
【図面の簡単な説明】
【図１】 本発明に係る生理用ナプキン１の一部破断平面図である。
【図２】 その横断面図である。
【図３】 エンボスパターンを示す要部平面図である。
【図４】 その要部拡大断面図である。
【図５】 夜用ナプキン１Ａの一部破断平面図である。
【図６】 貼り付き試験結果を示すグラフである。
【図７】 べた付き試験結果を示すグラフである。
【符号の説明】
１…生理用ナプキン、２…不透液性裏面シート、３…多孔性プラスチック表面シート（メッシュシート）、４…吸収体、４Ａ…クレープ紙、５…サイド不織布、６…親水性繊維シート、７…エンボス、８…第１領域、９…第２領域[0001]
BACKGROUND OF THE INVENTION
The present invention is an absorbent article mainly used for sanitary napkins, vaginal discharge sheets, incontinence pads, medical pads, toiletries, etc., and more specifically, absorbency, prevention of reversion, prevention of sticking to the skin The present invention relates to an absorbent article satisfying (dry feeling) and touch feeling in a well-balanced manner.
[0002]
[Prior art]
Conventionally, as an absorbent article such as a panty liner, sanitary napkin, incontinence pad, a liquid-impervious back sheet such as a polyethylene sheet or a polyethylene sheet-laminated nonwoven fabric, and a liquid-permeable surface sheet such as a nonwoven fabric or a liquid-permeable plastic sheet There is known an intervening absorber made of cotton-like pulp or the like.
[0003]
In the absorbent article, a heat-sealable hydrophobic porous plastic sheet (so-called mesh sheet) is used as the liquid-permeable surface sheet in order to satisfy the dry touch feeling on the skin and increase the absorbability of body fluid. A lot of what is done is offered to the market. As for the absorbent article using the mesh sheet, for example, the following Patent Documents 1 to 3 can be cited.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 7-328060 [Patent Document 2]
Japanese Patent Laid-Open No. 8-117277 [Patent Document 3]
JP-A-10-272152 [0005]
[Problems to be solved by the invention]
Certainly, in the case of an absorbent article using a mesh sheet as a top sheet, when the body fluid is discharged, it passes through the highly permeable mesh sheet so that the body fluid is quickly absorbed by the hydrophilic fiber sheet or the absorbent body. However, when the body fluid is absorbed and retained as it is in the hydrophilic fiber sheet, the body fluid absorption rate tends to decrease during the subsequent body fluid discharge. As it is seen, reversal of body fluid occurs. In addition, problems such as gradually losing the feeling of dry touch and feeling of sticking occurred. Further, in the case of a mesh sheet, there is a problem that the embossing gives a feeling of roughness to the skin, so that a sense of incongruity may be felt.
[0006]
Therefore, the main problem of the present invention is to provide an absorbent article that improves the feel of the skin, prevents reversal after liquid absorption, and reduces the feeling of sticking while taking advantage of the mesh sheet such as liquid absorbency and dry touch. There is to do.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, as the present invention according to claim 1, in an absorbent article in which an absorber is interposed between a porous plastic top sheet and a back sheet provided with a predetermined pattern of embossing,
The porous plastic surface sheet has an emboss pattern in which a center interval between adjacent embosses is 5 to 10 mm in a first region including a body fluid discharge site and its vicinity region, and in a second region other than the first region And an emboss pattern in which the center interval between adjacent embosses is 0.5 to 2 mm,
A hydrophilic fiber sheet is interposed between the porous plastic surface sheet and the absorbent body, and the porous plastic surface sheet has a difference in height in the thickness direction so that it is separated from the hydrophilic fiber sheet. An absorbent article characterized by being secured is provided.
[0008]
The inventor examined the relationship between the embossing pattern formed on the mesh sheet and the liquid absorption, dry touch feeling, touch feeling, reversibility, and sticking feeling. As the contact area increases, the liquid absorbency increases and the body fluid does not remain on the surface, so that the dry touch feeling is good. However, when dry, the embossing gives a rough feeling and the touch becomes poor. On the other hand, in the case of embossed patterns with a fine pitch, the embossing gives less roughness and feels good, and when sweating or when dry, the contact area is small, so there is little stickiness, but after absorbing liquid It was possible to obtain knowledge that body fluid remained on the surface and felt sticky because of its low liquid absorbency. From another point of view, the embossed pattern with a large pitch excels in various characteristics at the time of liquid absorption and after liquid absorption (when wet), and the embossed pattern with a fine pitch before liquid absorption ( The knowledge that it was excellent in various characteristics (when dry) was obtained.
[0009]
Therefore, in the first aspect of the invention, the required functions are satisfied in a well-balanced manner by changing the emboss pattern for each part. Specifically, in the first region including the body fluid discharge site and the vicinity thereof, an emboss pattern having a center interval between adjacent embosses of 5 to 10 mm is used, and the second region other than the first region is adjacent. An emboss pattern in which the center interval between the embosses is 0.5 to 2 mm or less was used. As a result, the fine embossed pattern in the second region, which has a relatively large area before liquid absorption, reduces the feeling of sticking and gives a good feel to the skin. Absorption of main body fluids during and after liquid absorption Since the large embossed pattern of the first region as the region exhibits liquid absorbency and a dry touch feeling, the absorbent article satisfies all the required functions in a well-balanced manner.
[0010]
As a second aspect of the present invention, the height difference in the thickness direction due to embossing in the first region is 0.5 to 3 mm, and the height difference in the thickness direction due to embossing in the second region is 0.05 to 1 mm. An absorbent article according to Item 1 is provided.
[0011]
In the present invention described in claim 2, in the first region including the body fluid discharge site, the body fluid is prevented from returning, and the height difference is increased in order to increase the concealment property of the body fluid absorbed by the absorber. In the two areas, the height difference was reduced in order to increase the touch feeling.
[0012]
The invention according to claim 3, wherein the emboss diameter in the first region is 1 to 5 mm, and the emboss diameter is 0.5 to 2 in the second region. A sex article is provided.
[0013]
As this invention which concerns on Claim 4, as for the said porous plastic surface sheet, the said 1st area | region is 10 to 40% of range with respect to the total exposure area of this surface sheet, and the said 2nd area | region is 60 to 90%. An absorbent article according to any one of claims 1 to 3 is provided.
[0014]
As this invention which concerns on Claim 5 , the said 2nd area | region is formed so that the said 1st area may be surrounded, The absorbent article in any one of Claims 1-4 is provided.
[0015]
As the present invention according to claim 6 , there is provided the absorbent article according to any one of claims 1 to 5 , wherein the hydrophilic fiber sheet uses an air-through nonwoven fabric.
[0016]
As the present invention according to claim 7 , there is provided the absorbent article according to any one of claims 1 to 5 , wherein the hydrophilic fiber sheet uses a spunbonded nonwoven fabric.
[0017]
In the inventions according to claims 6 and 7 , by using a relatively soft and bulky air-through nonwoven fabric or spunbonded nonwoven fabric, the cushioning property is given and the wearing feeling is improved, and the water retention capability is enhanced.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a partially broken perspective view of a sanitary napkin 1 according to the present invention.
[0019]
The sanitary napkin 1 is mainly used for applications such as panty liners, sanitary napkins, cage sheets, and incontinence pads. For example, as shown in FIG. The absorbent body 4 surrounded by the absorbent body 4 or the crepe paper 4A is interposed between the hydrophobic porous plastic surface sheet 3, and the side nonwoven fabrics 5 and 5 are provided on both sides, respectively, and the porous The hydrophilic sheet 6 is arranged between the hydrophilic plastic surface sheet 3 and the absorbent body 4. Around the absorber 4, the liquid-impervious back sheet 2 and the porous plastic top sheet 3 or the side nonwoven fabric 5 are joined together by an adhesive means such as a hot melt adhesive.
[0020]
The liquid-impervious back sheet 2 is made of a sheet material having at least water-impervious properties such as polyethylene and polypropylene, but in addition to this, a non-woven sheet after securing a substantially liquid-impervious property through a waterproof film. (In this case, a liquid-impervious back sheet is composed of the waterproof film and the nonwoven fabric). In recent years, those having moisture permeability tend to be suitably used from the viewpoint of preventing stuffiness. The water- and moisture-permeable sheet material is a microporous material obtained by melting and kneading an inorganic filler in an olefin-based resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. A sheet is preferably used.
[0021]
As the porous plastic surface sheet 3, a plastic sheet in which a large number of openings are formed (hereinafter referred to as a mesh sheet 3) is used. As this material sheet, for example, an olefin resin such as polyethylene or polypropylene is preferably used, but a polyamide resin such as polyester, nylon, EVA or the like can also be used.
[0022]
The mesh sheet 3 has an opening diameter of 0.05 to 3.0 mm, preferably 0.1 to 2.0 mm, more preferably 0.5 to 1.5 mm, and the number of openings is 100 to 500. / Cm ² , preferably about 200 to 400 / cm ² . In order to form the openings, the synthetic resin sheet is softened near the softening temperature and is positioned on the upper surface of the support having a large number of openings, and is sucked from below the support, There are a method of pressurizing air pressure from the upper surface and a method of stretching and opening the sheet material after engraving a large number of slits in the synthetic resin sheet material, but it can be formed by an appropriate method.
[0023]
As the material fibers constituting the side nonwoven fabrics 5 and 5, for example, synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, and natural fibers such as cotton are water repellent. What was processed can be used.
[0024]
As for the processing method, a nonwoven fabric obtained by an appropriate processing method such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an airlaid method or the like can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft.
[0025]
The absorbent body 4 interposed between the liquid-impervious back sheet 2 and the liquid-permeable top sheet 3 is, for example, a mixture of a superabsorbent resin in pulp or a mixture of chemical fibers in the pulp. In addition, those mixed with a superabsorbent resin are used. As shown in the figure, it is desirable that the absorbent body 4 is surrounded by crepe paper 4A in order to maintain its shape and quickly diffuse menstrual blood and prevent reverse return of menstrual blood once absorbed. Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as molten pulp, and artificial cellulose fibers such as rayon and acetate. Softwood pulp having a longer fiber length than hardwood pulp functions and It is preferably used in terms of price.
[0026]
Examples of the superabsorbent resin include cross-linked polyacrylate, self-crosslinked polyacrylate, saponified acrylate-vinyl acetate copolymer cross-linked, isobutylene / maleic anhydride copolymer cross-linked, Examples include cross-linked polysulfonates, and partially cross-linked water-swellable polymers such as polyethylene oxide and polyacrylamide. Among these, those based on acrylic acid or acrylate that are excellent in water absorption and water absorption speed are preferred. In the production process of the highly water-absorbent resin having the water absorption performance, the water absorption force and the water absorption speed can be adjusted by adjusting the crosslinking density and the crosslinking density gradient. The content of the superabsorbent resin is preferably 10 to 60%. When the content of the superabsorbent resin is less than 10%, sufficient absorbability cannot be provided, and when it exceeds 60%, the entanglement between the pulp fibers disappears, the sheet strength decreases, and tears, cracks, etc. Is likely to occur.
[0027]
The hydrophilic fiber sheet 6 disposed between the mesh sheet 3 and the absorbent body 4 only needs to be hydrophilic to body fluids. Specifically, by using recycled fibers such as rayon and cupra, natural fibers such as cotton, the material itself has hydrophilicity, or synthesis of olefins such as polyethylene or polypropylene, polyesters, polyamides, etc. A nonwoven fabric in which fibers are surface-treated with a hydrophilizing agent to impart hydrophilicity can be used. Among these materials, it is desirable to use an air-through nonwoven fabric or a spunbonded nonwoven fabric. By using a relatively soft and bulky air-through nonwoven fabric or a spunbonded nonwoven fabric, cushioning properties are imparted and a feeling of wearing is improved, and water retention ability is enhanced. In order to prevent the mesh sheet 3 from being separated, it is preferable to partially bond with a hot melt adhesive.
[0028]
In the present invention, in particular, in the mesh sheet 3, by changing the emboss pattern for each region, all functions and quality required for the top sheet 3 are satisfied in a balanced manner.
[0029]
Specifically, in the illustrated example, the mesh sheet 3 includes, for example, a first region 8 that is defined in an oval shape so as to include the body fluid discharge site H and a region in the vicinity thereof, and a first region 8 other than the first region 8. As shown in FIG. 3, the first region 8 is provided with a lattice-like emboss pattern with a predetermined interval in the column direction and the row direction, and is adjacent to the first region 8. Center distances P _H , P _V , and P _Q between the embosses 7 and 7 are set to 5.0 to 10.0 mm, preferably 6 to 8 mm. When the center distances P _H , P _V , and P _Q are less than 5.0 mm, as shown in an experimental example to be described later, since the contact area to the skin is small at the time of liquid absorption, the liquid absorbability is reduced. After the liquid absorption, the separation from the lower hydrophilic fiber sheet 6 cannot be ensured, and the body fluid returns more frequently. Moreover, a sticking feeling comes to be felt when a body fluid remains on the surface. On the other hand, when the center distances P _H , P _V , and P _Q exceed 10.0 mm, the feeling of roughness on the skin becomes prominent when dry, and the touch becomes worse.
[0030]
On the other hand, in the second region 9, as in the first region 8, a lattice-like emboss pattern with a constant interval is provided in the column direction and the row direction, but between the adjacent embosses 7, 7. The center intervals P _H , P _V , and P _Q are set to 0.5 to 2 mm, preferably 0.5 to 1 mm. When the center distances P _H , P _V , and P _Q are less than 0.5 mm, the liquid absorbency decreases, and the body fluid remains on the surface when wet, resulting in a feeling of sticking and a poor touch. . On the contrary, when the center distances P _H , P _V , and P _Q exceed 2.0 mm, the touch feeling during dryness cannot be satisfied.
[0031]
In the first region 8, the center interval between the adjacent embosses 7, 7 is 5 to 10 mm, and in the second region 9, the center interval between the adjacent embosses 7, 7 is 0.5 to 2 mm. The first embossed pattern of the second region 9 having a relatively large area before liquid absorption gives a good touch feeling, and the first region becomes the main body fluid absorption region during and after liquid absorption. The large embossed pattern of 8 can absorb liquid, prevent reversal when wet, and reduce the feeling of sticking, so that all required functions are satisfied in a well-balanced manner. The first region 8 is preferably 10 to 40% of the total exposed area of the mesh sheet 3, and the second region 9 is preferably 60 to 90%. When the ratio of the first region 8 is less than 10%, the body fluid cannot be absorbed effectively. Moreover, when a ratio exceeds 40%, the touch feeling of the whole surface will worsen.
[0032]
In addition, although the planar shape of the emboss 7 is circular in the illustrated example, it can be an arbitrary shape such as an ellipse, a triangle, a quadrangle, or a star. The embossed pattern is generally preferably a lattice shape, but may be an arbitrary pattern such as a rhombus lattice. Moreover, the embossing method can employ | adopt the method by thermocompression bonding.
[0033]
As shown in FIG. 4, in the first region 8, the height difference h in the thickness direction due to the embosses 7, 7... Is 0.5 to 3 mm, and in the second region 9, the embosses 7, 7. It is desirable that the height difference h in the thickness direction by 0.05 to 0.05 mm. In the first region 8, the height difference h is increased to 0.5 to 3 mm, so that the separation from the hydrophilic fiber sheet 6 is ensured. , Increase the concealment and make the menstrual blood absorbed by the absorber 4 less visible. On the other hand, by reducing the height difference of 0.05 to 1 mm in the second region 9, it becomes possible to further improve the feeling of sticking and the feeling of touch when dry.
[0034]
As for the emboss diameter, the diameter R in the first region 8 is increased to 1 to 5 mm to prevent the body fluid remaining on the surface from coming into contact with the skin, and the diameter R in the second region 9. It is desirable to improve the feeling of touch by reducing the thickness to 0.5 to 2 mm.
[0035]
In the case of the daytime sanitary napkin 1 shown in FIG. 1, the formation range of the first region 8 is 10 to 50 mm, preferably 20 to 30 mm, respectively, in the front direction and the rear direction from the center of the body fluid discharge site H. The regions L _F and L _B are desirable. In the case of a general napkin, about 9 cc can cover almost the whole amount of body fluid, and as a result of investigating the diffusion area in the front-rear direction at that time, it has been found that the above numerical range is sufficient. The position of the body fluid discharge site H is substantially the center position in the longitudinal direction, the center position of the wing when it has wings, the center position when it has arc-shaped constrictions on both side edges, or the longitudinal direction on both sides of the surface. If it has side embossing along, it is recognized as its center position.
[0036]
In the case of night napkin 1A shown in FIG. 5, 10 to 30 mm from the center point of the body fluid drainage site H to the front direction, preferably the region _{L F} of 10 to 20 mm, 30 to 100 mm in the rear direction, preferably desirable to a region _{L B} of 30 to 60 mm. The diffusion area of the rear for flows transmitted buttocks in the case of night napkin 1A is increased, so that a large rear region L _B. The position of the body fluid discharge site H is identified as the center position of the wings W, W, or the center position when both side edges are constricted in an arc shape.
[0037]
[Other examples]
(1) In the above embodiment, the second region 9 exists on both sides of the first region 8 and the first region 8 is surrounded by the second region 9 as a whole, but the section L _F of the first region 8, the entire width of the mesh sheet 3 may be used as the first region 8 in L _B. That is, the second region 9, the first region 8, and the second region 9 may be arranged in order from the front side or the rear side of the napkin 1.
[0038]
【Example】
A sample sheet provided with grid-like embossments with different diameters and pitches is prepared on a mesh sheet having a thickness of 0.449 mm, an aperture ratio of 24%, an opening area of 0.115 mm ² and a numerical aperture of 207 pieces / cm ^2. In order to evaluate the correlation between the embossed pattern and the contact area, a sticking test (dry state) is performed, and a sticky test (wet state) is used to evaluate the correlation between the elevation difference in the thickness direction due to embossing and reversal. Went. The sticking test measures the number of seconds until a 20 × 7.5 mm cut sample is left for 3 minutes under a silicone rubber (sphere with a radius of 10 cm, 3 kg) and then lifted to a height of 30 cm. The sticky test is a test in which a sample is used for 3 minutes after injecting 3 cc of artificial menstrual blood to a napkin using each sample sheet, and after 3 cc is injected, a filter paper is placed under a load of 100 g and the amount of reversion is measured. .
[0039]
In the evaluation of the sticking test, the surface sticking feeling after 1 hour of wearing is evaluated in seven stages from very good (+3) to the same (0) to very bad (-3). The evaluation values of the names were totaled. The evaluation of the stickiness test has seven stages of very good (+3) to the same (0) to very bad (-3) with a feeling of stickiness in the state in which menstrual blood has come out after 1 hour of actual use. The evaluation value of 8 persons was totaled.
[0040]
The results are shown in Table 1 below, and are plotted in FIG. 6 and FIG. 7 with the horizontal axis as the emboss pitch (mm) and the vertical axis as the test value.
[0041]
[Table 1]

[0042]
FIG. 6 is a graph with the horizontal axis representing the emboss pitch (mm) and the vertical axis representing the sticking test (seconds). It can be seen from the figure that the curve rises sharply when the emboss pitch exceeds 5 mm. There is a direct proportional correlation between the emboss pitch and the contact area that the contact area increases as the emboss pitch increases. From the graph, the emboss pitch is set to 5 mm or more to increase the liquid absorption by increasing the contact area. Since it is possible to prevent body fluid from remaining on the surface, it has been found that the embossing interval in the first region 8 is desirably 5 mm or more.
[0043]
FIG. 7 is a graph in which the horizontal axis represents the emboss pitch (mm) and the vertical axis represents the sticky test (g). From the figure, it can be seen that the curve suddenly descends when the emboss pitch exceeds 5 mm. There is a direct proportional relationship between the emboss pitch and the height difference that the restraint becomes smaller and the height difference becomes larger as the emboss pitch becomes larger. From the graph, the emboss pitch becomes sticky due to the increase in height difference when the emboss pitch is 5 mm or more. It has been found that the embossing interval in the first region 8 is preferably 5 mm or more because the feeling can be drastically reduced.
[0044]
【The invention's effect】
As described in detail above, according to the present invention, while taking advantage of the mesh sheet such as liquid absorbency, dry touch feeling, etc., it is possible to improve the feeling of touch, prevent reversion after liquid absorption, reduce the feeling of sticking, It is possible to satisfy all functions required for the topsheet in a balanced manner.
[Brief description of the drawings]
FIG. 1 is a partially broken plan view of a sanitary napkin 1 according to the present invention.
FIG. 2 is a cross-sectional view thereof.
FIG. 3 is a plan view of a main part showing an emboss pattern.
FIG. 4 is an enlarged cross-sectional view of a main part thereof.
FIG. 5 is a partially broken plan view of the night napkin 1A.
FIG. 6 is a graph showing a sticking test result.
FIG. 7 is a graph showing a sticky test result.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Impervious back sheet, 3 ... Porous plastic surface sheet (mesh sheet), 4 ... Absorber, 4A ... Crepe paper, 5 ... Side nonwoven fabric, 6 ... Hydrophilic fiber sheet, 7 ... embossing, 8 ... first area, 9 ... second area

Claims (7)

In an absorbent article in which an absorber is interposed between a porous plastic top sheet and a back sheet provided with a predetermined pattern of embossing,
The porous plastic surface sheet has an emboss pattern in which a center interval between adjacent embosses is 5 to 10 mm in a first region including a body fluid discharge site and its vicinity region, and in a second region other than the first region And an emboss pattern in which the center interval between adjacent embosses is 0.5 to 2 mm,
A hydrophilic fiber sheet is interposed between the porous plastic surface sheet and the absorbent body, and the porous plastic surface sheet has a difference in height in the thickness direction so that it is separated from the hydrophilic fiber sheet. Absorbent article characterized by being secured . The absorbent article according to claim 1, wherein the height difference in the thickness direction due to embossing in the first region is 0.5 to 3 mm, and the height difference in the thickness direction due to embossing in the second region is 0.05 to 1 mm. The absorbent article according to any one of claims 1 and 2, wherein an emboss diameter in the first region is 1 to 5 mm, and an emboss diameter in the second region is 0.5 to 2 mm. The porous plastic surface sheet has the first region in a range of 10 to 40% and the second region in a range of 60 to 90% with respect to the total exposed area of the surface sheet. Absorbent articles. The absorbent article according to claim 1, wherein the second area is formed so as to surround the first area. The absorbent article according to claim 1, wherein the hydrophilic fiber sheet uses an air-through nonwoven fabric. The absorbent article according to claim 1, wherein the hydrophilic fiber sheet uses a spunbond nonwoven fabric.

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