JP7085921B2 - Liquid permeable sheet for absorbent articles - Google Patents

Description

The present invention relates to a liquid permeable sheet for absorbent articles, and more particularly, to absorb light incontinence pads, panty liners, menstrual napkins, pantyliner absorption pads, urine absorption pads, disposable diapers for adults and children, and the like. Regarding a liquid permeable sheet for articles.

Conventionally, liquid permeable sheets for absorbent articles have been known. For example, Patent Document 1 discloses an absorbent article provided with a surface sheet located on the opposite surface side of the absorber.
The surface sheet is formed with a plurality of openings penetrating in the thickness direction.

Japanese Unexamined Patent Publication No. 8-246321

In the absorbent article disclosed in Patent Document 1, the surface sheet has a plurality of openings, so that the body fluid can be rapidly transferred to the absorbent body from the skin-facing surface of the absorbent article.

However, the surface sheet has a relatively low sheet strength due to the formation of a plurality of openings, and there is a risk that the surface sheet may be twisted or partially broken during wearing. In addition, the body fluid absorbed by the absorber may return (rewet back) to the surface side of the surface sheet through the opening.

The present invention is an improvement of the conventional invention, and provides a liquid-permeable sheet for an absorbent article which is excellent in liquid permeability, has a required sheet strength, and can suppress rewetback. Make it an issue.

The present invention comprises a woven fabric having first and second surfaces facing each other in the thickness direction, and a fiber web integrated with the first surface of the woven fabric by entanglement, and the constituent yarns of the woven fabric are cellulose. A liquid permeable material for an absorbent article, which is formed of a system fiber and in which the constituent fibers of the fiber web extend substantially flush with or more outward than the second surface of the woven fabric in the thickness direction. Regarding sex sheets.

The liquid permeable sheet for an absorbent article according to the present invention includes the following embodiments.
(1) The thickness dimension of the portion of the fiber web extending from the second surface of the woven fabric is 1.1 to 4.0 times the thickness dimension of the woven fabric.
(2) A part of the constituent fibers of the fiber web is wound around the constituent yarns of the woven fabric and extends to the second surface side through a plurality of meshes of the woven fabric.
(3) The constituent fibers of the fiber web include hydrophilic fibers and hydrophobic fibers, and the content of the hydrophobic fibers is higher than the content of the hydrophilic fibers.
(4) The hydrophilic fiber has an irregular cross section and has a plurality of grooves extending in the extending direction.
(5) The fiber web and the woven fabric are entangled and integrated by a fluid entanglement treatment.
(6) The fiber web is composed of short fibers, the fiber length of the short fibers is 25 to 64 mm, the fineness is 0.8 to 6.0 dtex, and the constituent yarns of the fabric are a plurality of raw yarns. It is composed of twisted yarn made of, and the fineness of the twisted yarn is 10 to 100 cotton count.
(7) The absorbent article further includes an absorbent body and is arranged on the skin-facing surface side of the absorbent body.
(8) The fiber length of the staple fibers is larger than at least one of the separation dimension between the warp threads which are adjacent to each other and parallel to each other and the separation dimension between the weft threads which are adjacent to each other and parallel to each other.

In the liquid-permeable sheet for an absorbent article according to the present invention, the surface sheet has a touch like a cloth, and it is possible to realize a good absorption rate of body fluid and suppression of a rewet phenomenon.

The drawings show particular embodiments of the invention and include not only the essential configurations of the invention, but also selective and preferred embodiments.
A plan view of a menstrual napkin as viewed from the surface side in an example of an absorbent article according to the present invention. Top view of the menstrual napkin seen from the back side. Sectional drawing along line III-III of FIG. Partial enlarged view of the liquid permeable sheet (surface sheet). The figure which shows the state which separated the liquid-permeable sheet into a fiber web and a woven fabric. Sectional drawing along the VI-VI line of FIG. An enlarged view of the hydrophilic fiber in an example of the hydrophilic fiber.

The following embodiments include not only the essential configurations of the invention, but also selective and preferred configurations with respect to the absorbent articles shown in the accompanying drawings. Hereinafter, embodiments of a menstrual napkin 10 which is an example of an absorbent article according to the present invention will be described with reference to the accompanying drawings. The menstrual napkin 10 has a vertical direction Y, a horizontal direction X, and a thickness direction Z.

Referring to FIGS. 1 to 3, the sanitary napkin 10 has a vertical center line P that divides the dimension in the width direction into two equal parts and a horizontal center line Q that divides the dimension in the length dimension into two equal parts. Convex on the facing surface (inner surface) side and the non-skin facing surface (outer surface) side on the opposite side, the convex first and second edge edges 10a and 10b, and the central portion where the lateral center line Q is located. The first and second side edges 10c and 10d, the liquid-permeable front sheet 11 located on the skin facing surface side, the impermeable back sheet 12 located on the non-skin facing surface side, and both of these sheets 11. , Includes a liquid-absorbing absorber 20 located between the 12's. The surface sheet 11 and the absorber 20 are joined to each other by a known joining means such as a hot melt adhesive to form a liquid absorbing layer 13.

Although not shown, in order to improve the flexibility of the sanitary napkin 10, a relatively bulky non-woven fabric intermediate sheet is placed between the surface sheet (liquid permeable sheet) 11 and the absorber 20. You may. Further, in order to suppress the leakage of body fluid between the absorber 20 and the back surface sheet 12, a leak-proof sheet made of a liquid-impermeable fibrous nonwoven fabric or a plastic film, which is preferably breathable, may be arranged. good.

The absorber 20 has a first edge 20a facing the first edge 10a, a second edge 20b facing the second edge 10b, and a longitudinal direction Y between the first and second edge 20a, 20b. It has first and second side edges 20c, 20d that extend. The front and back sheets 11 and 12 extend outward from the outer periphery of the absorber 20, and on the skin facing surface side of the front surface sheet 11, a pair of sides extending in the vertical direction Y so as to face each other in the horizontal direction X. The sheet 14 is arranged. The pair of side sheets 14 are joined to the surface sheet 11 via a side joint portion (not shown) made of known adhesive means or welding means. Although not shown, an elastic material extending in the vertical direction Y may be arranged on the side sheet 14 so as to be retractable in the extended state in order to form a leak-proof wall that stands up to the body side in the worn state. Further, the side joint portion for fixing the side sheet 14 may be a seal line extending in the vertical direction Y having a design element such as a floral pattern or a geometric pattern.

The menstrual napkin 10 is formed from the front surface sheet 11, the back surface sheet 12, and the side sheet 14, and both ends extending in the lateral direction X on the outside of the first and second end edges 20a and 20b of the absorber 20 in the longitudinal direction Y. It has 16 and both side edges 17 extending in the longitudinal direction Y outside the lateral X of the first and second side edges 20c, 20d of the absorber 20. At the central portion of the menstrual pad 10 in the vertical direction Y, a wing portion 18 formed by a part of both side edge portions 17 which is convex outward in the lateral direction X is located. Further, the sheets 11, 12, and 14 laminated to each other are joined to each other via an outer peripheral seal portion 19 located along the outer peripheral edge of the sanitary napkin 10.

Referring to FIG. 2, a plurality of fastening regions 30 are arranged on the back surface side of the sanitary napkin 10. The plurality of fastening regions 30 are for fastening the menstrual napkin 10 to clothing such as underwear, and are formed of a plurality of line-shaped adhesives or pressure-sensitive adhesives extending in the vertical direction Y. Will be done. The anchoring region 30 has a central region 31 extending in the vertical direction Y in a region overlapping the absorber 20 and a side region 32 located in the wing portion 18. The fastening area 30 is covered with a separator (not shown) made of a plastic film.

The surface sheet 11 is liquid permeable and has a skin facing surface (upper surface) 11a and a non-skin facing surface (lower surface) 11b located on the opposite side thereof, from a laminated sheet of the woven fabric 40 and the fiber web 50. It is formed. The back sheet 12 can be formed of a liquid-impermeable and moisture-permeable plastic film, a liquid-impermeable fibrous nonwoven fabric, a laminated sheet thereof, and the like. A known non-woven fabric can be used as the side sheet 14, but in order to effectively prevent lateral leakage of body fluid, it is preferable to use a sheet material having hydrophobicity or water repellency.

The outer peripheral sealing portion 19 can be bonded by an adhesive, ultrasonic welding, heat welding, laser welding, high frequency welding or the like by known welding means, or by embossing alone or in combination. Further, the sheets 11, 12, and 14 laminated in the thickness direction Z are joined to each other via an adhesive such as a hot melt adhesive. Examples of the hot melt adhesive coating method include various known coating methods such as spiral coating, coater coating, curtain coater coating, and spray coating.

Referring to FIGS. 3 and 4, the absorber 20 is a liquid absorbent core 21 formed by mixing superabsorbent polymer particles (SAP) and cellulosic fibers such as fluff wood pulp and rayon fiber into a predetermined shape. And a liquid-permeable core cover sheet 22 that covers the entire liquid-absorbing core 21 in order to improve its shape retention and liquid diffusivity.

The dimension of the core cover sheet 22 in the vertical direction Y is larger than the dimension of the liquid-absorbing core in the vertical direction Y, and the side edge portions 22a and 22b thereof absorb the entire liquid-absorbing core 21. The liquid core 21 is located so as to overlap each other on the bottom surface side in the central portion in the lateral direction X. By folding both side edge portions 22a and 22b together, a superposed portion 23 in which both side edge portions 22a and 22b extending in the vertical direction Y are laminated with each other is formed in the central portion of the absorber 20 in the lateral direction X. Will be done.

The core cover sheet 22 has a first covering portion 25 that covers the skin facing surface side of the liquid absorbing core 21, and a second covering portion 26 that covers the non-skin facing surface side of the liquid absorbing core 21. In the present embodiment, the core cover sheet 22 is formed of one continuous sheet, but the first core cover sheet forming the first covering portion 25 and the first core cover sheet are separate bodies. , May be composed of a second core cover sheet forming the second covering portion 26.

FIG. 4 is a partially enlarged view of the surface sheet 11, and FIG. 5 is an exploded perspective view of the surface sheet 11. The surface sheet 11 includes a woven fabric 40 located on the skin facing surface side and a fiber web 50 located on the non-skin facing surface side. The woven fabric 40 has a lower surface (first surface) 40a facing the fiber web 50 and an upper surface (second surface) 40b located on the opposite side of the lower surface 40a. The woven fabric 40 and the fiber web 50 are integrated with each other by entanglement. Depending on how the absorbent article is worn, the upper surface 40b of the woven fabric 40 may be located below and the lower surface 40a may be located above.

The woven fabric 40 is composed of constituent yarns 41 woven in a mesh pattern. The constituent yarn 41 has a plurality of warp 42 and a plurality of wefts 43 that intersect each other with the warp 42, and the warp 42 and the warp 43 intersect with each other in the thickness direction Z, whereby the plurality of meshes 45 are formed. It is formed. The constituent yarn 41 of the woven fabric 40 is a twisted yarn formed by twisting a raw yarn made of cotton yarn (cotton fiber). In addition to cotton fibers, cellulosic fibers such as natural cellulose fibers such as pulp fibers, regenerated cellulose fibers such as rayon, and semi-synthetic cellulose fibers such as acetate are preferably used as the raw yarn material. However, materials such as thermoplastic resin fibers such as polyethylene and polypropylene, cellulosic fibers and a mixture thereof can be appropriately used as long as the technical effects described later of the present invention are exhibited. The number of yarns (total of warp and weft) of the constituent yarns 41 is 60 to 100, and as the cotton yarn used for the raw yarn, a cotton yarn having a thickness of 10 to 100 can be preferably used.

The fiber web 50 is a fiber at a stage before being formed into a non-woven fabric, which is formed by a known manufacturing method such as a spunbond method using long fibers or a dry method in which short fibers are arranged in a certain direction with a card machine to form a web. It is an aggregate and is formed of constituent fibers 51 including hydrophilic fibers and hydrophobic fibers. Hydrophobic fibers include single fibers such as polyolefin-based thermoplastic fibers containing polypropylene (PP) and polyethylene (PE) and polyester-based thermoplastic fibers containing polyethylene terephthalate (PET), as well as core-sheath composite fibers. , Side-by-side type composite fiber, sea island type composite fiber and various other composite fibers can be used.

Examples of the hydrophilic fiber include natural cellulose fiber such as cotton and crushed pulp, regenerated cellulose fiber such as rayon and fibril rayon, semi-synthetic cellulose fiber such as acetate; and thermoplastic resin fiber and composite fiber subjected to hydrophilization treatment. Can be mentioned. In the present embodiment, the constituent fibers 51 of the fiber web 50 have hydrophobic fibers 10 to 20 gsm and hydrophilic fibers 5 to 10 gsm.

As a method for entwining and integrating the woven fabric 40 and the fiber web 50, for example, a known fluid entanglement treatment method can be used. In the process of manufacturing a liquid-permeable sheet by the fluid entanglement treatment method, the upper surface of the continuous network structure which is the material of the textile 40 is upward with respect to the continuous fiber web which is the material of the fiber web 50. By injecting a fluid such as air or water at high pressure from a plurality of nozzles arranged at intervals in a direction intersecting the transport direction of the continuous laminate from the side, the fibers (long fibers and short fibers) of the continuous fiber web are separated. Included) and the constituent threads of the continuous network can be entangled and integrated.

The continuous laminate is conveyed by a transport means made of a metal mesh belt, and when a fluid is sprayed from a nozzle onto the upper surface of the continuous laminate, the fibers of the continuous fiber web and the constituent threads of the continuous network structure are formed on the upper surface side. Is entangled, and also on the lower surface side facing the transport means, the fluid that hits the transport means and repels is entangled. Since the surface sheet 11 is obtained by entwining a fiber web 50 made of an aggregate of fibers with a woven fabric 40 by a fluid entanglement method, the constituent fibers of the fiber web 50 are compared with the case where the nonwoven fabric sheets are laminated and fluid entangled. It can be said that the 51 is easily entangled with the woven fabric 40, and the laminated state can be maintained more stably. Further, according to the fluid entanglement treatment method, it is possible to obtain a surface sheet 11 having desired sheet characteristics in terms of thickness, mass, absorption rate, sheet strength, etc. by appropriately changing the configuration of the mesh belt of the transport means. can.

Since the surface sheet 11 is formed by entwining the woven fabric 40 located on the skin facing surface side with the fiber web 50 located on the non-skin facing surface side by entanglement, the surface sheet 11 is formed only from the non-woven fabric. It is stronger than the above and can give a crispy texture like cloth. Further, since the woven fabric 40 has a mesh structure, the contact area with the skin is reduced, and a smooth touch feeling can be given.

The menstrual blood excreted in the surface sheet 11 is diffused along the warp 42 and the warp 43 of the woven fabric 40, and is absorbed downward through the constituent fibers 51 of the fiber web 50 extending downward from the mesh 45 of the woven fabric 40. Transferred to body 20. Further, as compared with the case where the surface sheet 11 is formed of a liquid-permeable fibrous nonwoven fabric, even if the sheet mass is the same, a mesh-like structure made of constituent yarns 41 having a higher fineness than the constituent fibers 51 of the fiber web 50. By having the woven fabric 40 of the above, the seat rigidity becomes relatively high. Thereby, it is possible to effectively prevent the surface sheet 11 from twisting or rising from the absorber 20.

When the surface sheet is made only of non-woven fabric containing hydrophilic fibers, it is quickly spread over a wide area and diffused even if the amount of menstrual blood excreted is small because of its excellent absorption rate and liquid diffusivity. The skin becomes dirty and may cause skin troubles. In the present embodiment, the surface sheet 11 is formed of a laminated sheet of the woven fabric 40 and the fiber web 50, and menstrual blood is difficult to diffuse through the constituent threads of the woven fabric 40, and when the excretion amount is small, it is spotted. Since it is absorbed, it is possible to prevent the skin from becoming dirty over a wide area and causing skin troubles.

FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. 4, and the absorber 20 located below the surface sheet 11 is shown by a virtual line. Referring to FIG. 6, in the surface sheet 11, the constituent fibers 51 of the fiber web 50 extend from the woven fabric 40 to the outside in the thickness direction Z. Specifically, the fiber web 50 has a downward extending portion 52 extending downward from the lower surface (first surface) 40a of the woven fabric 40 and an upward extending portion (upward extending portion) extending upward from the upper surface (second surface) 40b of the woven fabric 40. It has a portion) 53 extending from the second surface.

That is, a part of the fiber web 50 is located flush with or above the upper surface 40b from the woven fabric 40. When the surface sheet 11 is formed by the fluid entanglement method, the downward extending portion 52 of the fiber web 50 is a continuous fiber web on which a fluid is jetted at high pressure, while the upward extending portion 53 is a continuous fiber web. A part of the constituent fibers of the above is a portion extending to the mesh belt side as a transport means through a continuous mesh body which is a material of the woven fabric 40 located below.

The body fluid excreted on the surface sheet 11 is absorbed and diffused by the hydrophilic fibers contained in the upward extending portion 53 of the fiber web 50, and is absorbed and diffused by the warp 42 and the weft 43 of the woven fabric 40 in the longitudinal direction Y and the transverse direction. It spreads to X and is rapidly transferred to the absorber 20. At this time, since a part of the fiber web 50 is located substantially flush with or above the upper surface 40b of the woven fabric 40, it becomes closer to the skin and the absorption area of menstrual blood increases, so that more menstrual blood can be produced. Can be pulled in. Further, when a part of the fiber web 50 containing hydrophobic fibers is located above the upper surface 40b of the woven fabric 40, the body fluid absorbed and held by the woven fabric 40 and the absorber 20 is returned by body pressure or the like, so-called. It is possible to suppress the occurrence of a rewet phenomenon (rewet back).

Since the woven fabric 40 is composed of a plurality of warps 42 extending continuously and a plurality of wefts 43 extending continuously so as to intersect them in the thickness direction Z, the woven fabric 40 is in direct contact with the skin and is worn by the body. It can be said that the strength does not easily decrease even if pressure is applied or the menstrual blood is touched, and fluffing and sagging are unlikely to occur.

Since the woven fabric 40 is located closer to the skin than the fiber web 50, menstrual blood adhering to the skin can be scraped off by the constituent yarn 41 having a higher fineness and higher rigidity than the constituent fibers 51 of the fiber web 50. .. In particular, menstrual blood adheres to the skin so that it sticks to the skin when it comes into contact with air and hardens over time. By directly or indirectly touching the skin with the non-woven fabric 40 whose strength does not easily decrease even when pressure is applied or when it comes into contact with menstrual blood, menstrual blood stuck to the skin by the plurality of meshes 45 can be wiped off. Further, when the constituent yarn 41 of the woven fabric 40 is formed from twisted yarn, the entire outer peripheral surface is uneven, so that the scraping property is further improved.

The thickness dimension D3 of the upward extending portion 53 extending upward from the upper surface 40 b of the woven fabric 40 in the fiber web 50 is 1.1 to 4.0 times the thickness dimension D2 of the woven fabric 40. Is preferable. When the thickness dimension D3 has a relatively large size, both scraping property and suppression of the rewet phenomenon can be achieved at the same time. That is, when the thickness dimension D3 is less than 1.1 times the thickness dimension D2, it can be said that the woven fabric 40 is closer to the skin and therefore the scrapability is higher, but the portion of only the fiber web 50 is relatively relatively. The rewetting phenomenon cannot be effectively suppressed by the fiber web 50 which is thin and contains hydrophobic fibers. On the other hand, when the thickness dimension D3 exceeds 4.0 times the thickness dimension D2, the rewetting phenomenon can be suppressed by the upward extending portion 53 of the relatively thick fiber web 50, and the constituent fibers 51 can be suppressed. However, since the woven fabric 40 is located away from the skin, it becomes difficult to scrape the menstrual blood adhering to the skin.

<Measurement method of thickness dimension>
Here, the thickness dimension D2 of the woven fabric 40 can be measured in the state of the material by using a "PEACOCK dial thickness gauge JB manufactured by Ozaki Seisakusho Co., Ltd." having a stylus having a diameter of 50 mm. On the other hand, the thickness dimension D1 of the surface sheet 11 is an apparent thickness, and as shown in FIG. 6, the surface sheet 11 is preferably cut along the mechanical direction of the fiber web 50 to enlarge the cut surface. The photograph was taken with a digital microscope VHX-1000 manufactured by Keyence Co., Ltd., the maximum thickness dimension of the surface sheet 11 was measured based on this enlarged photograph, and the same measurement was performed at 5 randomly specified locations. An average value was obtained, and this average value was used as the thickness dimension D1 of the surface sheet 11. Further, the value obtained by subtracting the thickness dimension D2 of the woven fabric 40 and the thickness dimension of the downward extending portion 52 from the thickness dimension D1 of the surface sheet 11 is the thickness dimension of the upward extending portion 53 of the fiber web 50 (of the woven fabric 40). Separation dimension from the upper surface 40b to the apex 53a of the upward extending portion 53) D3. The measurement shall be performed in a measurement room under a standard atmosphere (temperature 20 ± 5 ° C., relative humidity 65% or less).

The upward extending portion 53 of the fiber web 50 has a plurality of bulky portions 54 having a relatively small thickness dimension D3 and a plurality of bulky portions 55 having a relatively large thickness dimension D3. Since the downward extending portion 52 of the fiber web 50 has an uneven shape, menstrual blood adhering to the skin together with the woven fabric 40 located below can be effectively scraped off.

Further, when the surface sheet 11 is formed by the fluid entanglement method, in the downward extending portion 52 where the high-pressure jetted fluid directly hits, the portion of the fiber web 50 where the fluid jetted from the nozzle directly hits is the other. It is bulkier than the part of. The bulky portion 56 includes a portion to which the fluid directly hits, in which case the bulky portion 56 has a higher fiber density than the bulky portion 57. Therefore, the body fluid transferred from the woven fabric 40 to the downward extending portion 52 is rapidly transferred to the absorber located further below in the bulky portion 56 having a relatively high fiber density as compared with the bulky portion 57. be able to.

Since the fiber web 50 is integrated with the woven fabric 40 by entanglement without using an adhesive or the like, the fiber web 50 is superior in flexibility as compared with the case where the fiber web 50 is joined to each other via an adhesive or the like. In the mode in which the constituent fibers 51 of the fiber web 50 are entangled with the woven fabric 40, in addition to a part of the constituent fibers 51 being entwined with or wound around the warp and weft of the woven fabric 40, A part of the constituent fibers 51 may be entangled with each other so as to enter between the warp threads 42 made of twisted threads and the warp threads 43. In this way, the constituent fibers 51 are entangled with the outer and inner surfaces of the warp 42 and the weft 43, so that the fiber web 50 is stably integrated with the woven fabric 40.

The constituent fibers 51 of the fiber web 50 have a fineness of 0.8 to 6.0 dtex, preferably 1.0 to 4.4 dtex, more preferably 1.3 to 3.3 dtex, and a fiber length of 25 to 64 mm, preferably 25 to 64 mm. , 32 to 58 mm, more preferably 38 to 51 mm, and the fineness of the constituent yarn 41 made of twisted yarn is 10 to 100 cotton count, preferably 20 to 60 cotton count, still more preferably 30 to 45 cotton count. Is. Since the constituent fibers 51 of the fiber web 50 are short fibers, the fiber web 50 has a plurality of fiber ends, and the fiber ends may enter the twisted gaps of the raw yarn having a higher fineness than that, or the constituent yarns may be formed. By winding the fiber web 50 so as to cling to the 41, the fiber web 50 is stably entangled with the woven fabric 40.

With reference to FIG. 4 again, the fiber length of the short fibers of the fiber web 50 is one of the separation dimension R1 between the warp 42s adjacent to each other and parallel to each other and the separation dimension R2 between the wefts 43 parallel to each other adjacent to each other. It is larger than at least one of the separation dimensions. In such a case, the short fibers do not fall out from the mesh 45 of the woven fabric 40, and the short fibers extend so as to straddle the mesh 45, thereby improving the sheet strength and the liquid diffusivity of the entire surface sheet 11. sell.

The content of hydrophilic fibers in the fiber web 50 is less than 50% by mass, preferably 10 to 49% by mass, and the content of hydrophobic fibers exceeds 50% by mass, preferably 51 to 90% by mass. Therefore, the proportion of hydrophobic fibers in the fiber web 50 is higher than the proportion of hydrophilic fibers. Due to the high proportion of hydrophobic fibers, diffusivity can be suppressed and the rewetting phenomenon can be suppressed.

Further, when the content of the hydrophilic fibers is less than 10% by mass, the ratio of the hydrophobic fibers is relatively large, and the rewet phenomenon can be suppressed, while the drawability of menstrual blood from the skin is lowered. On the other hand, when the content of the hydrophilic fiber is 50% by mass or more, more menstrual blood can be rapidly absorbed, but a rewet phenomenon is likely to occur. The surface sheet 11 contains hydrophilic fibers and hydrophobic fibers in a well-balanced manner, thereby realizing good liquid absorption and diffusivity and suppression of the rewet phenomenon.

FIG. 7 is an enlarged view of a modified cross-sectional fiber having a modified cross-sectional shape in an example of a hydrophilic fiber. The hydrophilic fiber 60 is a thermoplastic resin fiber that has been subjected to a hydrophilic treatment, for example, a hydrophilic PET fiber, and has a plurality of grooves 61 extending in the extending direction thereof. Since the hydrophilic fiber 60 has a plurality of grooves 61 extending in the extending direction, the surface area in contact with menstrual blood becomes larger as compared with the case where the outer peripheral surface is flat, and the pullability of menstrual blood is improved.

In one example of another embodiment according to the present embodiment, unbleached pulp fiber that has not been completely delignin-treated can be used as the material of the raw yarn of the woven fabric 40. In such a case, since the unbleached pulp fiber containing a relatively large amount of lignin component has a light brown color derived from a natural material, the entire surface sheet 11 has a natural light brown color. Since the surface sheet 11 has a light brown color, it is possible to give the wearer or the like an impression that the product is a skin-friendly product using natural materials and has a high natural orientation. In addition, since the redness of menstrual blood absorbed by the absorber 20 is suppressed as compared with the case of using a bleached white sheet, it is possible to directly visually recognize menstrual blood by a minor who has just begun menstruation. It is possible to reduce the anxiety about menstruation caused by menstruation. Further, since the lignin component has an excellent antibacterial effect, the sanitary napkin 10 can be worn and disposed of more hygienically.

Further, at least one of the first and second covering portions 25 and 26 of the core cover sheet 22 covering the liquid absorbing core 21 may contain unbleached pulp fibers. In such a case, together with the surface sheet 11 containing unbleached pulp fibers, it can give a skin-friendly impression due to a natural color and contribute to the concealing property and antibacterial property of menstrual blood.

In the present specification, as the liquid-permeable sheet for the absorbent article 10 according to the present invention, the embodiment relating to the surface sheet 11 arranged on the skin facing surface side of the absorber 20 has been described, but the absorbent article 10 has been described. It can also be used as a sheet to be used, for example, an intermediate sheet located on the inner surface side of the surface sheet, a core cover sheet, or the like. Further, the absorbent article 10 is not limited to a menstrual napkin, and may include, for example, diapers for adults and children and a urine absorbing pad, and can be used as a liquid-permeable sheet for urinating or loose stool.

10 Absorbent article (physiological napkin)
11 Liquid permeable sheet (surface sheet)
20 Absorber 40 Woven fabric 40a First surface (lower surface)
40b 2nd surface (upper surface)
41 Constituent yarn 45 Mesh 50 Fiber web 51 Constituent fiber 53 Part of the fiber web extending from the second surface of the woven fabric 60 Hydrophilic fiber 61 Groove D2 Thickness dimension of the woven fabric D3 Extending from the second surface of the woven fabric Part thickness dimension Z Thickness direction

Claims (9)

A woven fabric having a first surface and a second surface facing each other in the thickness direction, and a fiber web integrated with the first surface of the woven fabric by entanglement are provided.
The constituent yarns of the woven fabric are made of cellulosic fibers.
A liquid-permeable sheet for an absorbent article in which the constituent fibers of the fiber web extend substantially flush with or more than the second surface of the woven fabric in the thickness direction. The permeable liquid according to claim 1, wherein the thickness dimension of the portion of the fiber web extending from the second surface of the woven fabric is 1.1 to 4.0 times the thickness dimension of the woven fabric. Sex sheet. The first or second aspect of the present invention, wherein a part of the constituent fibers of the fiber web is wound around the constituent yarn of the woven fabric and extends to the second surface side through a plurality of meshes of the woven fabric. Liquid permeable sheet. The transparency according to any one of claims 1-3, wherein the constituent fibers of the fiber web include hydrophilic fibers and hydrophobic fibers, and the content of the hydrophobic fibers is higher than the content of the hydrophilic fibers. Liquid sheet. The liquid-permeable sheet according to claim 4, wherein the hydrophilic fiber has an irregular cross section and has a plurality of grooves extending in the extending direction. The liquid-permeable sheet according to any one of claims 1-5, wherein the fiber web and the woven fabric are entangled and integrated by a fluid entanglement treatment. The fiber web is composed of short fibers, the fiber length of the short fibers is 25 to 64 mm, the fineness is 0.8 to 6.0 dtex, and the constituent yarns of the fabric are twisted yarns composed of a plurality of raw yarns. The liquid-permeable sheet according to claim 2, wherein the twisted yarn has a fineness of 10 to 100 cotton counts. The liquid-permeable sheet according to any one of claims 1-7, wherein the absorbent article further comprises an absorbent body and is arranged on the skin-facing surface side of the absorbent body. The fiber length of the staple fiber is larger than the separation dimension of at least one of the separation dimension of the warp threads parallel to each other adjacent to each other and the separation dimension of the weft threads parallel to each other adjacent to each other in claim 7. The described liquid permeable sheet.

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