WO2021131250A1

WO2021131250A1 - Absorbent article

Info

Publication number: WO2021131250A1
Application number: PCT/JP2020/038750
Authority: WO
Inventors: 貴志野本; 久孝七海; 明寛木村; 耕出谷; 友美衛藤
Original assignee: ユニ・チャーム株式会社
Priority date: 2019-12-26
Filing date: 2020-10-14
Publication date: 2021-07-01
Also published as: KR20220121798A; JP7254690B2; CN114828797B; JP2021104201A; CN114828797A

Abstract

This absorbent article has a longitudinal direction, width direction, and thickness direction orthogonal to one another, and includes an absorber, a front surface sheet provided more toward a skin-side in the thickness direction than the absorber, and a rear surface sheet provided more toward a non-skin side in the thickness direction than the absorber. The front surface sheet includes a woven or knitted fabric in which multiple threads cross one another when viewed in the thickness direction, each of the multiple threads includes a crossing part where the threads cross one another and a non-crossing part where the threads do not cross one another, and an end edge of the absorbent article in the longitudinal direction has the non-crossing parts of the multiple threads.

Description

Absorbent article

The present invention relates to an absorbent article.

For absorbent articles such as sanitary napkins, each sheet material is laminated and cut into a product shape, and then the outer edge is sealed to fix the laminated state of each sheet at the front and rear ends of the product. For example, in Patent Document 1, the front surface sheet and the back surface sheet of the absorbent article are heat-sealed with each other at a portion extending from the longitudinal end portion of the absorber, and both end portions of the absorbent article in the longitudinal direction are respectively. Discloses an absorbent article in which a pair of sealing portions is formed. Further, as the surface sheet of Patent Document 1, a non-woven fabric sheet made of a thermoplastic synthetic fiber is preferably used.

Japanese Unexamined Patent Publication No. 2001-129090

According to the absorbent article of Patent Document 1, the sheets can be firmly fixed to each other while the leak-proof sheet 23 is interposed between the front surface sheet and the back surface sheet, and the sheets can be prevented from peeling off. However, the seal portion tends to be hardened by heat fusion, and there is a risk that the seal portion may be bent at the boundary of the seal portion during mounting, or the hard seal portion may come into contact with the user's skin and cause discomfort to the user.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide an absorbent article in which the edge in the longitudinal direction is hard to be hardened and the user can easily feel the softness. It is in.

The main invention for achieving the above object has a longitudinal direction, a width direction, and a thickness direction orthogonal to each other, and an absorber and a surface sheet provided on the skin side in the thickness direction of the absorber. And an absorbent article having a back surface sheet provided on the non-skin side in the thickness direction of the absorber, and the front surface sheet has a plurality of threads intersecting each other when viewed in the thickness direction. The plurality of yarns each have an intersection that intersects with each other and a non-intersection that does not intersect with each other, and the longitudinal edge of the absorbent article. Is an absorbent article characterized by having said non-intersecting portions of the plurality of threads.
Other features of the present invention will be clarified by the description in the present specification and the accompanying drawings.

According to the present invention, it is possible to provide an absorbent article in which the edge in the longitudinal direction is less likely to become hard and the user can easily feel the softness.

FIG. 1 is a plan view of the sanitary napkin 1 as viewed from the skin side. FIG. 2 is a plan view of the sanitary napkin 1 as viewed from the non-skin side. FIG. 3 is a cross-sectional view taken along the line XX of FIG. FIG. 4 is a partially enlarged view of the surface sheet 3. FIG. 5 is a diagram showing a state in which the surface sheet 3 is separated into the woven fabric 40 and the fiber aggregate 50. FIG. 6 is a partially enlarged plan view of the woven fabric 40 of the surface sheet 3. It is sectional drawing which follows the YY line of FIG.

The description of this specification and the accompanying drawings will clarify at least the following matters.
It has a longitudinal direction, a width direction, and a thickness direction that are orthogonal to each other, and has an absorber, a surface sheet provided on the skin side in the thickness direction of the absorber, and a thickness direction of the absorber. An absorbent article having a back surface sheet provided on the non-skin side of the above, wherein the front surface sheet has a woven fabric or a knitted fabric in which a plurality of threads intersect each other in the thickness direction. Each of the threads has an intersection that intersects with each other and a non-intersection that does not intersect with each other, and the longitudinal end edge of the absorbent article is the non-intersection of the plurality of threads. It is an absorbent article characterized by having.

According to such an absorbent article, the non-intersecting portion where the threads do not intersect is the portion where the threads are made one by one. The longitudinal edge is less likely to become stiff due to the non-intersection of each such thread, and the user is more likely to feel soft to the edge of the absorbent article.

In such an absorbent article, the woven fabric has a plurality of warp threads and a plurality of warp threads and a plurality of weft threads intersecting each other in the thickness direction, and the warp threads and the weft threads are respectively. It is desirable to have the intersection and the non-intersection, and the longitudinal edge of the absorbent article to have the non-intersection of the warp or weft.

According to such an absorbent article, the non-intersecting portion where the warp and the weft of the woven fabric do not intersect is a portion where the warp or the weft is composed of one by one, and the end edge forms such a non-intersecting portion. By holding it, it does not become hard easily, and the user can easily feel the softness up to the edge of the absorbent article.

In such an absorbent article, the surface sheet further has a non-woven fiber aggregate, and the fiber aggregate is integrated with the non-skin side surface of the woven fabric or the knitted fabric by entanglement to form a part thereof. It is desirable that the fibers extend toward the skin side in the thickness direction rather than the skin side surface of the woven fabric or the knitted fabric.

According to such an absorbent article, the strength of the surface sheet can be maintained by entanglement, and the laminated state can be ensured without firmly adhering the woven fabric or knitted fabric to the fiber aggregate. As a result, the rigidity of the end portion in the longitudinal direction is unlikely to increase. Further, since the weft and warp yarns of the woven fabric are less likely to be displaced due to entanglement, or the yarns of the knitted fabric are less likely to be displaced from each other, the distance between the yarns can be easily maintained uniformly and the aesthetic appearance can be maintained. In addition, the excrement liquid easily migrates to the lower absorber along the fibers extending to the skin side.

It is desirable that the front surface sheet and the back surface sheet are joined by a hot melt adhesive at both end edges of the absorbent article in the longitudinal direction.

According to such an absorbent article, when the sheets are joined and then cut into a product shape, the warp and weft threads of the woven fabric or the threads of the knitted fabric are less likely to come apart.

In such an absorbent article, the woven fabric has a plurality of warp threads, a plurality of warp threads and a plurality of weft threads intersecting each other in the thickness direction, and the surface sheet and the absorber are formed. Having a squeezed portion, the average value of the length of the bottom of the squeezed portion in the width direction is larger than the average value of the length between the intersections of the warp and the weft of the woven fabric in the width direction. Long is desirable.

According to such an absorbent article, the squeezed part has a certain thickness, so that it is easy to bend and the fit to the body is improved. Further, since the intersection (intersection) between the warp and the weft is present in the width of the squeezed portion, the shape of the squeezed portion is more likely to be maintained by the thickness of the intersection than the portion without the intersection when squeezed.

In such an absorbent article, the elongation in the longitudinal direction of the woven fabric is 3 to 8%, the elongation in the longitudinal direction of the knitted fabric is 80 to 100%, and the depth of the pressed portion is uniform. Is desirable.

According to such an absorbent article, since the elongation in the longitudinal direction of the woven fabric and the knitted fabric is low, the elongation of the entire surface sheet is low regardless of whether the woven fabric or the knitted fabric is used. By squeezing the hard-to-stretch surface sheet using a roll or the like having no unevenness, it is easy to provide a squeezed portion having a uniform depth. If the bottom of the squeezed portion is uneven, that is, if there is a change in the depth, the squeezed portion tends to be hard, but if the depth is constant, the squeezed portion can maintain its softness. In addition, such a squeezed portion tends to draw in the excrement liquid uniformly.

In such an absorbent article, the constituent yarn of the woven fabric is composed of twisted yarn composed of a plurality of raw yarns, and it is desirable that the fineness of the twisted yarn is 30 cotton counts or more and 100 cotton counts or less.

According to such an absorbent article, the thinner the constituent yarn, the softer the woven fabric is, and the more flexible the absorbent article itself using the woven fabric is.

In such an absorbent article, the surface sheet further has a non-woven fiber aggregate, and the fiber aggregate is located on the skin side in the thickness direction with respect to the skin side surface of the woven fabric or the knitted fabric. The non-skin-side extending portion includes the skin-side extending portion and the non-skin-side extending portion located on the non-skin-side extending portion in the thickness direction from the non-skin-side side surface of the textile or the knitted fabric. It is desirable that the maximum thickness of is larger than the maximum thickness of the skin-side extending portion.

According to such an absorbent article, the thickness of the portion extending to the non-skin side is larger, so that more liquid is transmitted along the fibers of the fiber aggregate to the lower side of the fiber aggregate ( It becomes easier to enter the absorber arranged on the non-skin side in the thickness direction).

In such an absorbent article, it is desirable that the surface sheet further has a non-woven fiber aggregate, and the fiber aggregate contains hydrophilic fibers and hydrophobic fibers.

According to such an absorbent article, the hydrophilic fiber makes the surface sheet feel like a cloth and has excellent excrement scraping property, and the hydrophobic fiber causes creases due to the fibers sticking to each other. Formation can be suppressed.

It is desirable that the hydrophilic fiber contains rayon fiber in such an absorbent article.

According to such an absorbent article, rayon not only improves the liquid drawing property, but also gives flexibility to the fiber aggregate because the fiber itself is thin and soft.

It is desirable that the fiber aggregate is such an absorbent article and does not contain a hydrophilic oil agent.

According to such an absorbent article, usually, a hydrophilic oil agent is used to impart hydrophilicity to hydrophobic fibers, but since it has hydrophilicity by containing hydrophilic fibers such as rayon, it is hydrophilic. Fiber aggregates can be formed without the use of rayon. Therefore, skin irritation caused by the oil agent coming into contact with the skin is unlikely to occur, and it is gentle on the skin.

In such an absorbent article, it is desirable that the weight of the hydrophobic fiber contained in the fiber aggregate per unit area is larger than the weight of the hydrophilic fiber contained in the unit area.

According to such an absorbent article, the large weight of the hydrophobic fibers makes it difficult for the fiber aggregate to hold the liquid, and the liquid is guided to the absorber side through the fibers of the fiber aggregate. In addition, even if the liquid tries to return due to body pressure during wearing, it is difficult to draw in the liquid that tried to return, and the liquid return is suppressed.

In such an absorbent article, the woven fabric has a plurality of warp threads, and the warp threads and a plurality of weft threads that intersect each other in the thickness direction, and the warp threads and the weft threads, respectively. All the non-intersections at both ends in the width direction in the region where the surface sheet exists in the longitudinal edge of the absorbent article having the intersection and the non-intersection. The ratio of the non-intersecting portion of the weft to the number of portions is larger than the proportion of the non-intersecting portion of the weft to the total number of the non-intersecting portions in the central portion in the width direction. Is desirable.

According to such an absorbent article, both ends in the width direction are portions where the wearer's inguinal region is likely to hit during wearing, and the weft yarn end touches the inguinal region due to the non-intersection of the weft yarn. It feels good on the skin.
=== Embodiment ===

Hereinafter, embodiments will be described with reference to a sanitary napkin as an example of the absorbent article of the present invention. However, the present invention is not limited to this, and the present invention is also applicable to other absorbent articles such as a vaginal discharge sheet and a urine absorbing pad.
<Basic configuration of sanitary napkin 1>

FIG. 1 is a plan view of the sanitary napkin 1 (hereinafter, also referred to as “napkin 1”) as viewed from the skin side. FIG. 2 is a plan view of the sanitary napkin 1 as viewed from the non-skin side. FIG. 3 is a cross-sectional view taken along the line XX of FIG.

The napkin 1 has a longitudinal direction, a width direction, and a thickness direction that are orthogonal to each other. In the longitudinal direction of the napkin 1, the side that comes into contact with the wearer's lower abdomen is called the front side, and the side that comes into contact with the wearer's buttocks is called the posterior side. In the thickness direction, the side in contact with the wearer is called the skin side, and the opposite side is called the non-skin side.

As shown in FIG. 3, the napkin 1 is provided on the absorber 2, the surface sheet 3 provided on the skin side in the thickness direction of the absorber 2, and the non-skin side in the thickness direction of the absorber 2. It has a back surface sheet 4 and a pair of side sheets 5. The surface sheet 3 and the absorber 2 are bonded to each other by a known bonding means such as a hot melt adhesive. The front surface sheet 3 and the back surface sheet 4 have a plane size larger than that of the absorber 2 and cover the entire plane surface of the absorber 2. Further, the front surface sheet 3, the back surface sheet 4 and the side sheet 5 laminated to each other are joined to each other via an outer peripheral seal portion 8 (see FIG. 2) located along the outer peripheral edge of the napkin 1.

As shown in FIG. 1, the pair of side sheets 5 are provided on both sides of the surface sheet 3 in the width direction, and are arranged along the longitudinal direction so as to overlap from the skin side in the thickness direction of the surface sheet 3. .. The pair of side sheets 5 are joined to the surface sheet 3 via a side joint (not shown) made of known bonding means or welding means.

Further, the napkin 1 has a pair of wing portions 6 extending from the central region in the longitudinal direction of the napkin 1 to both outer sides in the width direction. The wing portion 6 is formed by a side sheet 5 extending outward from both side portions in the width direction of the front surface sheet 3 and a back surface sheet 4. The napkin 1 may be in a form that does not have a wing portion 6.

Although not shown, an intermediate sheet formed of a non-woven fabric or the like having a relatively high fiber density may be arranged between the surface sheet 3 and the absorber 2 in order to improve the flexibility of the napkin 1. .. Further, in order to suppress leakage of body fluid between the absorber 2 and the back surface sheet 4, a leak-proof sheet made of a liquid-impermeable plastic film, a non-woven fabric, or the like, which is preferably breathable, may be arranged. Good.

As shown in FIG. 2, the non-skin side surface of the napkin 1 (non-skin side surface of the back sheet 4) is provided with an adhesive region 11 provided by applying an adhesive or the like. When the napkin 1 is used, the adhesive region 11 is attached to the side surface of the skin such as underwear, whereby the napkin 1 is fixed to the underwear or the like. In FIG. 2, six rectangular adhesive regions 11 having long sides in the longitudinal direction are arranged at intervals in the width direction, but the shape and number of the adhesive regions 11 are not limited to this.

Similarly, an adhesive region 12 for the wing portion is provided on the non-skin side surface of each wing portion 6 (non-skin side surface of the back surface sheet 4). When the napkin 1 is used, the adhesive region 12 for the wing portion is attached to the non-skin side surface of the underwear or the like, whereby the napkin 1 is fixed to the underwear or the like. In FIG. 2, a rectangular adhesive region 12 for a wing portion having a long side in the longitudinal direction is provided for each wing portion 6, but the shape and number of the adhesive regions 12 for the wing portion are not limited to this. Further, the adhesive region 11 and the adhesive region 12 for the wing portion are each covered with a separator (not shown) made of a plastic film.

Further, the napkin 1 has a squeezed portion (recess) 7 in which the surface sheet 3 and the absorber 2 are squeezed. In the present embodiment, the surface sheet 3 and the absorber 2 are squeezed from the skin side surface of the surface sheet 3 in the thickness direction, and the surface sheet 3 and the absorber 2 are joined and integrated. The pressing portion 7 can prevent the surface sheet 3 from floating, and when menstrual blood or the like flows into the pressing portion 7, it can promote the penetration into the absorber 2 and suppress the diffusion.

The surface sheet 3 is liquid-permeable and has a skin side surface (upper surface) 3a and a non-skin side surface (lower surface) 3b located on the opposite side in the thickness direction, and is composed of a woven fabric 40 and a fiber aggregate 50. Has been done. The back sheet 4 can be formed from a liquid-impermeable and moisture-permeable plastic film, a liquid-impermeable non-woven fabric, a laminated sheet thereof, and the like. A known non-woven fabric can be used for the side sheet 5, but it is preferable to use a sheet material having hydrophobicity or water repellency in order to effectively prevent lateral leakage of body fluid.

The absorber 2 is a member that absorbs excrement such as menstrual blood and retains it inside. As shown in FIG. 3, the absorbent core 10 that absorbs a liquid and the shape-retaining property and the liquid of the absorbent core 10 It has a liquid-permeable core wrap sheet 20 that covers the entire absorbent core 10 in order to improve diffusivity.

The absorbent core 10 is formed into a predetermined shape by adding a highly absorbent polymer (so-called SAP) or the like which is a liquid absorbent granular material to pulp fiber or cell roll type absorbent fiber which is a liquid absorbent fiber. It is a thing. The core wrap sheet 20 is a liquid-permeable sheet, and examples thereof include tissue paper, hydrophilic non-woven fabric, and airlaid.

The core wrap sheet 20 is arranged so as to cover the entire absorbent core 10, and the

side edge portions

20a and 20b of the core wrap sheet 20 along the longitudinal direction are in the central portion of the absorbent core 10 in the width direction. They are laminated on each other on the non-skin side (see FIG. 3). In the present embodiment, the core wrap sheet 20 is formed of one continuous sheet, but the sheet member covering the skin side surface of the absorbent core 10 and the sheet member covering the non-skin side surface are separately configured. May be good.
<Woven fabric 40 and fiber aggregate 50 of surface sheet 3>

FIG. 4 is a partially enlarged view of the surface sheet 3 as viewed from the skin side, and FIG. 5 is a diagram showing a state in which the surface sheet 3 is separated into a woven fabric 40 and a fiber aggregate 50. As shown in FIGS. 3, 4 and 5, the surface sheet 3 has a woven fabric 40 located on the skin side surface and a fiber aggregate 50 located on the non-skin side surface. As shown in the partially enlarged view and FIG. 5 in FIG. 3, the woven fabric 40 has a lower surface 40a facing the fiber assembly 50 and an upper surface 40b facing the opposite skin. The woven fabric 40 and the fiber aggregate 50 are integrated by being entangled (entangled) with each other. The method of entwining the woven fabric 40 and the fiber aggregate 50 will be described later.

As shown in FIG. 4, the woven fabric 40 is composed of constituent yarns 41 woven in a lattice pattern. The constituent yarn 41 has a plurality of warp yarns 42 and a plurality of weft yarns 43 that intersect each other in the thickness direction with the warp yarns 42, and the intersections form a plurality of weaves 45. 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 hemp and pulp fibers, regenerated cellulose fibers such as rayon, and semi-synthetic cellulose fibers such as acetate are preferably used as the material of the raw yarn. The cotton yarn used for the raw yarn is preferably 30 cotton counts or more and 100 cotton counts or less. The finer the constituent yarn 41, the softer the woven fabric 40 can be.

Since the woven fabric 40 mainly made of cotton material or the like is located on the skin side of the surface sheet 3, the user can obtain a comfortable touch and skin troubles are less likely to occur. Further, the weaving method of the woven fabric 40 is not limited to the plain weave woven in a lattice pattern as described above, and known weaving methods such as twill weave, satin weave, and entwined weave can be appropriately adopted.

Further, although the surface sheet 3 of the present embodiment has the woven fabric 40, the woven fabric 40 may be a knitted fabric. A knitted fabric is composed by bundling a large number of fibers and knitting twisted yarns, and like a woven fabric, a plurality of yarns intersect each other in the thickness direction. The knitting method may be either warp knitting or weft knitting, and examples thereof include tenjiku, tricot, milling cutter, Kanoko, honeycomb mesh, cardboard knit, and fleece.

The fiber aggregate 50 is formed by a known manufacturing method such as a spunbond method using long fibers or a dry method in which short fibers are carded in a certain direction with a card machine to prepare the fibers to form a web. It is a fiber aggregate at the stage before it is made into a non-woven fabric. Further, the fiber aggregate 50 is formed from constituent fibers 51 including hydrophilic fibers. Rayon fiber is used as the hydrophilic fiber of this embodiment. In addition to improving the liquid drawability by the rayon fiber, the rayon fiber imparts flexibility to the fiber assembly 50 because the fiber itself is thin and soft. The hydrophilic fiber is not limited to rayon fiber, and may be, for example, regenerated cellulose fiber such as fibril rayon, natural cellulose fiber such as cotton or crushed pulp, or semi-synthetic cellulose such as acetate.

As a method of entwining and integrating the woven fabric 40 and the fiber aggregate 50, for example, a known water flow entanglement method can be used. In the manufacturing process of the liquid-permeable sheet by the water flow entanglement method, a continuous laminate formed by laminating a continuous fiber aggregate, which is a material of the fiber aggregate 50, on the upper surface of a continuous lattice-shaped woven fabric, which is a material of the woven fabric 40. On the other hand, a high-pressure water stream is injected from a plurality of nozzles arranged at intervals in a direction intersecting the transport direction of the continuous laminated body. As a result, the constituent fibers 51 of the fiber assembly 50 and the constituent yarns 41 of the woven fabric 40 can be entangled and integrated. It is also possible to give a handle to the integrated sheet by the pressure of water. When the woven fabric 40 is a knitted fabric, the knitted fabric and the fiber aggregate 50 can be entangled and integrated by the same method.

The surface sheet 3 of the present embodiment formed by entwining the woven fabric 40 located on the skin side and the fiber aggregate 50 located on the lower surface (non-skin side surface) 40a of the woven fabric 40 is formed only of the non-woven fabric. The strength is higher than that of the surface sheet 3 in the case. Further, since the fiber aggregate 50 is integrated with the woven fabric 40 without using an adhesive or the like, it is superior in flexibility as compared with the case where the fiber aggregates 50 are joined to each other via an adhesive or the like. Therefore, the napkin 1 using such a surface sheet 3 can easily maintain its softness up to the end portion 1 ep in the longitudinal direction. Further, due to the entanglement, the warp threads 42 and the weft threads 43 of the woven fabric 40 are less likely to be displaced (in the case of knitting, the threads are displaced from each other), so that the distance between the threads can be easily maintained uniformly, and the surface sheet 3 can be easily displaced. You can keep the beauty.

Further, as shown in FIG. 4, a part of the constituent fibers 51 is entwined with or wound around the warp 42 and the weft 43 of the woven fabric 40, and further, the warp 42 and the weft 43 It may be entangled so as to enter between the yarns of. As a result, the fiber assembly 50 and the woven fabric 40 are stably integrated. Then, some of the constituent fibers 51 extend toward the skin side in the thickness direction from the skin side surface (upper surface) 40b of the woven fabric 40 (partially enlarged view of FIG. 3), and are excreted in the surface sheet 3. The body fluid is diffused along the warp 42 and the weft 43 of the woven fabric 40, and is rapidly transferred to the lower absorber 2 through the constituent fibers 51 of the fiber aggregate 50 extending to the skin side. .. The constituent fibers 51 of the fiber assembly 50 are short fibers having a fiber length of 25 to 64 mm, preferably 32 to 58 mm, and more preferably 38 to 51 mm.

Further, if the surface sheet 3 is composed of only the woven fabric 40, when the end portion of the product is cut into the product shape, the constituent yarn 41 of the woven fabric 40 is at the end edge 1ed (FIG. 1) in the longitudinal direction of the napkin 1. Although there is a possibility that the woven fabric 40 and the fiber aggregate 50 are entangled and integrated, the texture 45 of the woven fabric 40 is stabilized, and the constituent yarn 41 is difficult to be brought close even at the time of cutting. Therefore, the end of the product (1 ep in this case) can be cut neatly.

As described above, in the napkin 1 of the present embodiment, the surface sheet 3 in which the woven fabric 40 and the fiber aggregate 50 are entangled and integrated is used on the side that comes into contact with the user's skin. On the other hand, the surface sheet of a general sanitary napkin is often formed only of non-woven fabric, and at the time of manufacturing, each sheet material is adhered to cut the product end into a product shape, and then the outer edge is heat-melted. There are cases where each sheet material is fixed to each other by wearing it. The part sealed by heat fusion is firmly joined, but since the joined part tends to be hard, there is a risk that it will bend at the boundary with the joined part when wearing it, or when it touches the user's skin It may cause discomfort.

Regarding this point, in the napkin 1 of the present embodiment, the front surface sheet 3 and the back surface sheet 4 are joined to each other in the outer peripheral sealing portion 8 of the front surface sheet 3 without the woven fabric 40 made of cotton yarn being heat-sealed, so that the front surface sheet 3 and the back surface sheet 4 are joined in the longitudinal direction. The outer edge (end 1 ep) of the napkin does not become hard and retains its softness. Further, when the woven fabric 40 of the surface sheet 3 exists up to the edge 1ed (FIG. 1) in the longitudinal direction of the napkin 1, the following effects can be obtained.

FIG. 6 is a partially enlarged plan view of the woven fabric 40 of the surface sheet 3. In FIG. 6, the fiber assembly 50 and the side sheet 5 are omitted for convenience in order to explain the states of the warp 42 and the weft 42 of the woven fabric 40. As shown in FIG. 6, the warp 42 and the weft 43 of the woven fabric 40 each have an intersecting portion cx that intersects with each other and a non-intersecting portion nx that does not intersect with each other. Then, in the vicinity of the central position CL in the width direction of the napkin 1, the end edge 1ed in the longitudinal direction of the napkin 1 has a non-intersecting portion nx of a plurality of warp threads 42. Further, on the outer side in the width direction, the end edge 1ed has a non-intersecting portion nx of a plurality of weft threads 43 and a non-intersecting portion nx of the warp threads 42.

The non-intersecting portion nx in which the warp 42 and the weft 43 of the woven fabric 40 do not intersect is a portion in which the warp 42 or the weft 43 is formed one by one. Since the longitudinal edge 1ed has a plurality of non-intersecting portions nx in which such threads are made one by one, the edge 1ed is less likely to become stiff. Since the flexibility can be maintained up to the edge 1ed of the napkin 1, the user can easily feel the softness.

When the woven fabric 40 is a knitted fabric, the portion where the plurality of threads constituting the knitted fabric intersect each other is referred to as an intersecting portion cx, and the portion not intersecting with each other is referred to as a non-intersecting portion nx, and the portion in the longitudinal direction of the napkin 1 is defined. Since the edge 1ed has the non-intersecting portion nx of the plurality of threads, the same effect as when the woven fabric 40 is used can be obtained.

Further, in the napkin 1 of the present embodiment, the front surface sheet 3 and the back surface sheet 4 are joined by a hot melt adhesive (not shown) at both end edges (including each end edge 1ed) in the longitudinal direction. Specifically, a hot melt adhesive is provided in a region extending from one end to the other end of the surface sheet 3 in the longitudinal direction, for example, by drawing an Ω pattern or a spiral pattern. Since the front surface sheet 3 and the back surface sheet 4 are fixed to the edge 1ed with a hot melt adhesive, the warp 42 and the weft 43 of the woven fabric 40 are separated even when the end of the product is cut into the product shape after fixing. It becomes difficult to get rid of. Since the warp 42 and the weft 43 do not fray at the edge 1ed, the aesthetic appearance of the napkin 1 can be maintained.

Although the outer peripheral seal portion 8 is provided in the present embodiment, since the woven fabric 40 and the fiber aggregate 50 are entangled and integrated to form the front surface sheet 3, the front surface sheet 3 and the back surface are laminated with each other. If the sheet 4 and the side sheet 5 are joined with an adhesive such as the above-mentioned hot melt adhesive, the product shape can be maintained without providing the outer peripheral sealing portion 8. As a result, the flexibility of the product edge can be ensured.

Further, as shown in the partially enlarged views of FIGS. 1 and 4, in the region where the surface sheet 3 exists in the longitudinal edge 1ed of the napkin 1, the center in the width direction is set as the central portion 1ch, and the width direction Assuming that both ends are 1et, the warp 42 and the weft 43 of the woven fabric 40 are arranged as follows. The central portion 1ch referred to here is a portion facing both sides (outside) in the width direction from the central position CL, which is 10% of the total length in the width direction of the surface sheet 3 at the longitudinal end edge 1ed of the napkin 1. Similarly, both end portions 1et are oriented inward in the width direction from the outer end 1ee (FIG. 4) in the width direction of the surface sheet 3 by 10% of the total length in the width direction of the surface sheet 3 at the edge 1ed. This is the part. In the central portion 1ch of the present embodiment, the total number of the intersecting portion cx and the non-intersecting portion nx arranged on the edge 1ed is 12, and all of them are the non-intersecting portions nx of the warp 42. Further, in the end portion 1et, the total number of the intersection cx and the non-intersection portion nx arranged at the end edge 1ed is 18, of which 15 are the non-intersection portion nx and 3 are the intersection portion cx. is there. Further, among the non-intersecting portions nx of the end portion 1et, the number of non-intersecting portions nx of the weft 43 is seven. That is, the ratio of the non-intersecting portion nx of the weft 43 to the total number of non-intersecting portions nx (15) in the end portion 1et (that is, 7/15 = about 47%) is the center in the width direction. It is larger than the ratio (0/12 = 0%) of the number of non-intersecting portions nx (0) of the weft 43 to the total number of non-intersecting portions nx (12) in the portion 1ch. Both end portions 1et in the width direction are portions where the inguinal region of the wearer easily hits while wearing the napkin 1. As in the present embodiment, the ratio of the non-intersecting portion nx of the weft thread 43 in such both end portions 1et is larger than that in the central portion 1ch, so that the thread end of the weft thread 43 easily touches the inguinal region and the skin. It will be a hit.

<Squeezing part 7>
As described above, the napkin 1 has a squeezed portion 7 in which the surface sheet 3 and the absorber 2 are squeezed. A plurality of the squeezed portions 7 of the present embodiment are formed in a continuous line along the outer peripheral edge portion of the absorber 2, thereby forming a substantially annular shape long in the longitudinal direction as a whole. The shape and arrangement of the squeezed portion 7 is not limited to this, and can be formed into a desired shape.

Further, the squeezed portion 7 has a bottom portion 7d (see FIG. 3), and the average value of the width L (length L in the width direction) of the bottom portion 7d is between the intersections of the warp threads 42 and the weft threads 43 of the fabric 40 in the width direction. Is longer than the average value of the length M (see FIGS. 4 and 6). The method of obtaining the average value of each length is as follows. First, an enlarged photograph of the surface sheet 3 including the squeezed portion 7 and the woven fabric 40 is taken using a digital microscope VHX-1000 manufactured by KEYENCE CORPORATION. As for the woven fabric 40, as shown in FIG. 4, in one weave 45 of the weaves 45, the intersections of the warp threads 42 adjacent to one weft thread 43 with the respective weft threads 43 are C1 and C2. And. C1 and C2, which are the intersections in the width direction, are connected by a straight line, and the length of the straight line is the length M between the intersections in the width direction. In FIG. 4, as a further example, the intersections of the warp threads 42 adjacent to another weft thread 43 with the respective weft threads 43 are set to C3 and C4, and similarly, the straight line connecting C3 and C4 is the length M between the intersection points. It is shown as. Based on the above-mentioned enlarged photograph, the length M is randomly measured at, for example, 10 points, and the average value of the measured values is obtained. Regarding the squeezed portion 7, for example, the length L in the width direction of the bottom portion 7d is randomly measured at 10 points in the enlarged photograph of the surface sheet 3 viewed from the skin side, and the average value of the measured values is obtained.

Since the squeezed portion 7 has a certain thickness, it is easy to bend, and the fit of the napkin 1 to the body is improved. Further, the width L of the bottom 7d of the squeezed portion 7 is longer than the length M between the intersections of the warp 42 and the weft 43 in the width direction, so that the width L of the squeezed portion 7 is included in the width (length in the width direction) of the squeezed portion 7. There will be an intersection (intersection cx) between the warp 42 and the weft 43. When forming the squeezed portion 7, if there is an intersection (intersection cx) at the squeezed portion, the shape of the squeezed portion 7 can be easily maintained by the thickness of the intersection where the threads overlap.

Further, the squeezed portion 7 is formed by squeezing the surface sheet 3 and the absorber 2 in the thickness direction, and at that time, the elongation of the woven fabric 40 of the surface sheet 3 in the longitudinal direction is 3 to 8. %, More preferably 5 to 6%. The elongation in the width direction of the woven fabric 40 is 15 to 30%, more preferably 19 to 26%. When the woven fabric 40 of the surface sheet 3 is a knit, the elongation in the longitudinal direction of the knit is preferably 80 to 100%, more preferably 85 to 95%, and the elongation in the width direction is 150 to 160. It is preferably%.

Here, the above-mentioned "elongation" is the elongation rate (%) of the woven fabric 40 (or knitted fabric), and can be measured in accordance with JIS L1906 "Fabric test method for woven fabrics and knitted fabrics". Specifically, a woven fabric 40 (or knitted fabric) in a state before being entangled with the fiber aggregate 50 is cut into a size of 25 mm in width and 150 mm in length to prepare a test piece, and a predetermined tensile speed (for example, 100 mm / min) is produced. ) To extend and obtain the value of elongation at break. As the tensile tester, for example, an autograph type tensile tester (model name: AG-I) manufactured by Shimadzu Corporation can be used. The measurement is performed three times, and the average value is taken as the elongation of the woven fabric 40 (or knitted fabric).

When forming the squeezed portion 7, since the squeezed portion is provided while transporting the napkin 1 in the MD direction (longitudinal direction), the elongation in the longitudinal direction of the woven fabric 40 or the knitted fabric is low, so that the bottom 7d of the squeezed portion 7 It can be formed without providing unevenness on the surface. Specifically, since the elongation of the woven fabric 40 of the present embodiment in the longitudinal direction is low, the elongation of the entire surface sheet 3 formed by entwining the woven fabric 40 and the fiber aggregate 50 is also low. If an attempt is made to form the pressed portion 7 with an embossed roll or the like having irregularities on such a hard-to-stretch surface sheet 3, the surface sheet 3 may not stretch according to the irregularities and the thread of the woven fabric 40 may break. .. However, by forming the squeezed portion 7 with a roll or the like having a uniform surface without unevenness, the squeezed portion 7 having a uniform depth can be formed.

The depth of the squeezed portion 7 is the length P (FIG. 3) from the bottom surface (bottom) 7d of the squeezed portion 7 to the outer peripheral edge in the direction orthogonal to the bottom surface (bottom) 7d of the squeezed portion 7. Further, "uniformity" here does not mean strict uniformity such that the depth of the compression portion 7 is completely the same at any position, but when the surface sheet 3 is visually confirmed from the skin side. , A state in which no unevenness is observed on the bottom 7d of the compressed portion 7 and no change is observed in the depth to the bottom 7d. If a linear squeezed portion is formed while squeezing a sheet material having a high elongation so as to form irregularities on the bottom, the squeezed portion tends to be hard due to the formed irregularities. On the other hand, unlike the squeezed portion 7 of the present embodiment, since the bottom portion 7d has no unevenness and the depth is constant, the surface of the bottom portion 7d becomes smooth, and the squeezed portion 7 can maintain its softness. In addition, the uniform depth makes it easy to uniformly draw in the excrement liquid accumulated in the squeezed portion 7.

In general, knitted fabrics tend to stretch more easily than woven fabrics, but for example, knitted fabrics formed by warp knitting such as tricot knitting have the property of being difficult to stretch in the longitudinal direction as described above. The same effect can be obtained by forming the squeezed portion 7 on the surface sheet 3 containing such a knitted fabric in the same manner as in the case of the woven fabric 40. Further, the knitted fabric formed by weft knitting usually has a high elongation, but when such a wefted knitted fabric is used, there is an advantage that it is difficult to tear when forming the squeezed portion 7.

Further, the fiber aggregate 50 contains hydrophilic fibers as described above, but also contains hydrophobic fibers as well as hydrophilic fibers. As the hydrophobic fiber, a polyester-based thermoplastic resin fiber is preferable, but a polyolefin-based thermoplastic fiber containing polypropylene (PP) and polyethylene (PE) and a composite fiber having a core-sheath structure composed of PP and PE. , Side-by-side type composite fibers and other composite fibers can also be used.

Since the fiber aggregate 50 contains hydrophilic fibers and hydrophobic fibers, the hydrophilic fibers make the surface sheet 3 feel like a cloth, and the excrement is excellently scraped off. It is possible to suppress the formation of folding habits due to the sticking of fibers.

Further, the hydrophobic oil may be imparted with hydrophilic performance by using a hydrophilic oil agent, but the fiber aggregate 50 of the present embodiment does not contain the hydrophilic oil agent. That is, since the fiber aggregate 50 has hydrophilicity by containing rayon fibers which are hydrophilic fibers, no hydrophilic oil agent is used. Therefore, skin irritation caused by the oil agent coming into contact with the skin is unlikely to occur, and it is gentle on the skin.

Further, when the fiber aggregate 50 contains hydrophobic fibers, the mixing ratio of the hydrophilic fibers and the hydrophobic fibers is such that the weight of the hydrophobic fibers contained per unit volume is the weight of the hydrophilic fibers contained per unit volume. Is preferably larger than. As an example, it is preferable to blend 70% by weight of hydrophobic fibers and 30% by weight of hydrophilic fibers. Since the fiber assembly 50 contains hydrophobic fibers, the fiber assembly 50 itself becomes difficult to hold the liquid, and the liquid is easily guided to the absorber 2 side through the constituent fibers 51 of the fiber assembly 50. Further, even if the liquid tries to revert due to body pressure while wearing the napkin 1, the weight of the hydrophobic fibers contained in the unit volume is larger as the composition ratio of the fibers of the fiber assembly 50, so that the reversion is attempted. It is difficult to draw in liquid and suppresses liquid return.

FIG. 7 is a cross-sectional view taken along the line YY of FIG. 4, and the core wrap sheet 20 and the absorbent core 10 located on the non-skin side of the surface sheet 3 are shown by virtual lines. Referring to FIG. 7, in the surface sheet 3, some constituent fibers 51 of the fiber aggregate 50 extend toward the skin side or the non-skin side in the thickness direction of the woven fabric 40. Specifically, the fiber aggregate 50 includes a skin-side extending portion 52 located on the skin side in the thickness direction of the upper surface (skin side surface) 40b of the woven fabric 40 and a lower surface (non-skin side surface) of the woven fabric 40. It includes a non-skin side extending portion 53 located on the non-skin side in the thickness direction of 40a. The non-skin side extension portion 53 is a portion to which a high-pressure water stream is directly injected when it is formed by the water flow confounding method. On the other hand, the skin-side extending portion 52 penetrates between the grid-like constituent yarns 41 and the constituent yarns 41 of the woven fabric 40, which was located below when the high-pressure water stream is injected, and is placed on the mesh belt side, which is a conveying means. This is the extended part.

Further, as shown in FIG. 7, the thickness from the upper surface (skin side surface) 40b of the fabric 40 to the point 51a extending most to the skin side of the skin side extending portion 52 is the maximum thickness D1 of the skin side extending portion 52. Assuming that the thickness from the lower surface (non-skin side surface) 40a of the fabric 40 to the point 51b extending to the most non-skin side of the non-skin side extending portion 53 is the maximum thickness D2 of the non-skin side extending portion 53. The maximum thickness D2 of the non-skin-side extending portion 53 is preferably larger than the maximum thickness D1 of the skin-side extending portion 52.

The maximum thickness D1 and the maximum thickness D2 are apparent thicknesses, and the measurement of the thickness dimensions is such that the surface sheet 3 is first cut, preferably along the thickness direction of the fiber assembly 50, as shown in FIG. Then, an enlarged photograph of the cut surface is taken using a digital microscope VHX-1000 manufactured by KEYENCE CORPORATION. Based on this enlarged photograph, the distance dimension (D1) from the upper surface 40b of the woven fabric 40 to the point 51a extending most to the skin side of the skin side extending portion 52 is measured, and the distance dimension (D1) from the lower surface 40a of the woven fabric 40 to the non-skin side is measured. The distance dimension (D2) up to the point 51b extending to the most non-skin side of the extending portion 53 is measured.

As described above, since the maximum thickness D2 of the non-skin side extending portion 53 of the fiber assembly 50 is larger, more liquid is drawn to the non-skin side along the fiber 51 of the fiber assembly 50, and the fibers. The liquid can be rapidly transferred to the absorber 2 arranged on the non-skin side of the aggregate 50.
=== Other embodiments ===

Although the embodiments of the present invention have been described above, the above embodiments are for facilitating the understanding of the present invention, and are not for limiting the interpretation of the present invention. Further, the present invention can be changed or improved without departing from the spirit thereof, and it goes without saying that the present invention includes an equivalent thereof.

1 Sanitary napkin (absorbent article)
1ch Width central part, 1ed edge 1ee outer end, 1ep end 1et width direction end 2 absorber 3 surface sheet 3a skin side surface (upper surface)
3b Non-skin side surface (bottom surface)
4 Back sheet 5 Side sheet 6 Wing part 7 Squeezed part 7d Bottom (bottom)
8 Outer peripheral seal part 10 Absorbent core 11 Adhesive area 12 Adhesive area for wing part 20

Core wrap sheet

20a, 20b Both side edges 40 Woven fabric 40a Bottom surface (non-skin side surface)
40b top surface (skin side surface)
41 Constituent yarn 42 Warp yarn 43 Weft yarn 45 Weave 50 Fiber aggregate 51 Constituent fiber 52 Skin side extension part 53 Non-skin side extension part 60 Hydrophilic fibers C1 to C4 intersections

Claims

It has a longitudinal direction, a width direction, and a thickness direction that are orthogonal to each other.
Absorber and
A surface sheet provided on the skin side in the thickness direction of the absorber and
An absorbent article having a back surface sheet provided on the non-skin side in the thickness direction of the absorber.
The surface sheet has a woven fabric or knitted fabric in which a plurality of threads intersect each other in the thickness direction.
Each of the plurality of threads has an intersection that intersects with each other and a non-intersection that does not intersect with each other.
The absorbent article, wherein the longitudinal edge of the absorbent article has said non-intersections of the plurality of threads.
The absorbent article according to claim 1.
The fabric has a plurality of warp threads and a plurality of weft threads that intersect each other in the thickness direction of the warp threads.
The warp and the weft each have the intersection and the non-intersection.
The absorbent article, characterized in that the longitudinal end edge of the absorbent article has the non-intersection of the warp or weft.
The absorbent article according to claim 1 or 2.
The surface sheet further has a non-woven fiber aggregate and
The fiber aggregate is entangled and integrated with the non-skin side surface of the woven fabric or the knit, and some constituent fibers extend from the skin side surface of the woven fabric or the knit to the skin side in the thickness direction. An absorbent article characterized by being present.
The absorbent article according to any one of claims 1 to 3.
An absorbent article characterized in that the front surface sheet and the back surface sheet are joined by a hot melt adhesive at both end edges of the absorbent article in the longitudinal direction.
The absorbent article according to claim 4.
The fabric has a plurality of warp threads and a plurality of weft threads that intersect each other in the thickness direction of the warp threads.
The surface sheet and the absorber have a squeezed portion, and the surface sheet and the absorber have a squeezed portion.
An absorbent article characterized in that the average value of the lengths of the bottom of the squeezed portion in the width direction is longer than the average value of the lengths between the intersections of the warp threads and the weft threads of the woven fabric in the width direction. ..
The absorbent article according to claim 4 or 5.
Absorption characterized in that the elongation in the longitudinal direction of the woven fabric is 3 to 8%, the elongation in the longitudinal direction of the knitted fabric is 80 to 100%, and the depth of the pressed portion is uniform. Sex goods.
The absorbent article according to any one of claims 1 to 6.
The constituent yarn of the woven fabric is an absorbent article characterized in that it is composed of twisted yarns composed of a plurality of raw yarns, and the fineness of the twisted yarns is 30 cotton counts or more and 100 cotton counts or less.
The absorbent article according to any one of claims 1 to 7.
The surface sheet further has a non-woven fiber aggregate and
The fiber aggregate has a skin-side extending portion located on the skin side in the thickness direction of the woven fabric or the knitted fabric, and the thickness direction of the woven fabric or the knitted fabric on the non-skin side surface. The absorbency is characterized in that the maximum thickness of the non-skin side extension portion is larger than the maximum thickness of the skin side extension portion, including the non-skin side extension portion located on the non-skin side of the skin. Goods.
The absorbent article according to any one of claims 1 to 8.
The surface sheet further has a non-woven fiber aggregate and
The fiber aggregate is an absorbent article characterized by containing hydrophilic fibers and hydrophobic fibers.
The absorbent article according to claim 9.
The hydrophilic fiber is an absorbent article characterized by containing rayon fiber.
The absorbent article according to claim 9 or 10.
The fiber aggregate is an absorbent article characterized by not containing a hydrophilic oil agent.
The absorbent article according to any one of claims 9 to 11.
An absorbent article characterized in that, in the fiber assembly, the weight of the hydrophobic fibers contained per unit area is larger than the weight of the hydrophilic fibers contained per unit area.
The absorbent article according to any one of claims 1 to 12.
The fabric has a plurality of warp threads and a plurality of weft threads that intersect each other in the thickness direction of the warp threads.
The warp and the weft each have the intersection and the non-intersection.
In the region where the surface sheet exists in the edge of the absorbent article in the longitudinal direction.
The ratio of the weft to the non-intersecting portions in the both ends in the width direction is the ratio of the non-intersecting portions of the weft to the number of all non-intersecting portions in the central portion in the width direction. An absorbent article characterized in that it is larger than the proportion occupied by the non-intersecting portion of the weft.