Absorbent article
By designing a slender low base weight part and a compression groove protruding toward the rear, the problem of insufficient fit of the absorbent article on the buttocks is solved, and effective absorption of body fluids and preventing leakage is achieved. Effect.
Patent Information
- Application Number
- CN202380040324.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-05-31
- Filing Date
- 2023-03-28
- Publication Date
- 2024-12-27
AI Technical Summary
Existing absorbent items cannot fit the buttocks fully when the wearer moves, resulting in concerns about body fluid leakage.
An absorbent article is designed, which has an elongated low basis weight portion in the opposite region of the hip groove. The pulp basis weight of the low basis weight portion is lower than the side and rear, forming a compression groove protruding toward the rear to enhance the Fitness and prevent leakage.
It effectively improves the fit of the buttocks, prevents body fluid from leaking downstream, and improves the ability to absorb body fluid through the combined structure of the low base weight part and the compression tank.
Smart Images
Figure CN119212662A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to an absorbent article. Background Art
[0002] As absorbent articles such as sanitary napkins for menstruation, there is known a product for long-term use or night use, in which the rear of the product is set to be longer so that the main body can face the buttocks. Various reviews have been conducted on the structure of such absorbent articles to prevent body fluid leakage by improving the fit to the buttocks in the rear area. For example, Patent Document 1 describes an absorbent article, in which the absorbent core in the rear area is formed with front and rear slits extending along the front and rear direction and penetrating the thickness direction of the absorbent core, and auxiliary slits extending from the front and rear slits to the outside in the width direction.
[0003] Patent Document 1: Japanese Patent Application Publication No. 2016-119987 Summary of the invention
[0004] [Problems to be solved by the present invention]
[0005] However, in the conventional structure, the main body may not fit the body part along the gluteal groove sufficiently due to the wearer's wearing style, movement during wearing, etc. Therefore, there is still a concern that body fluids may leak out from the gluteal groove to the rear or rear side of the gluteal groove. Therefore, the fit to the buttocks, especially the fit to the part where the depth of the gluteal groove changes, is sought to be improved to prevent the so-called downstream leakage.
[0006] Therefore, an object of one aspect of the present invention is to provide an absorbent article which improves the fit to the buttocks and can prevent the occurrence of downstream leakage.
[0007] [Methods used to solve the problem]
[0008] One aspect of the present invention is an absorbent article having an elongated main body, the main body including a top sheet on the skin side, a back sheet on the side opposite to the skin side, i.e., the non-skin side, and an absorbent body arranged between the top sheet and the back sheet, wherein, in an area facing the gluteal groove which faces the gluteal groove of the wearer when worn, on a center line of the main body extending along the length direction, there is a low basis weight portion elongated in the length direction, the pulp basis weight of the absorbent body in the low basis weight portion is at least lower than the pulp basis weight on the sides and rear of the low basis weight portion, the width of the low basis weight portion is 5% to 25% of the width of the absorbent body, and at least on the top sheet and the absorbent body, a compression groove is formed which is recessed from the top sheet side to the back sheet side, the compression groove includes a rear compression groove which is convex toward the rear and surrounds the rear end portion of the low basis weight portion.
[0009] [Effects of the Invention]
[0010] According to one aspect of the present invention, it is possible to provide an absorbent article that improves fit to the buttocks and prevents downstream leakage. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 This is a plan view of the absorbent article according to one embodiment of the present invention as viewed from the top sheet side.
[0012] Figure 2 It is along Figure 1 Cross-sectional view of line II.
[0013] Figure 3 It is along Figure 1 Cross-sectional view of line II-II.
[0014] Figure 4 Yes Figure 1 A top view of an absorbent article with the absorbent body exposed.
[0015] Figure 5 This is a diagram for explaining the function of the rear low basis weight portion.
[0016] Figure 6 yes Figure 1 A partial enlarged view of . DETAILED DESCRIPTION
[0017] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that, in the drawings, unless otherwise specified, the same or corresponding structures are given the same reference numerals and the description thereof is omitted.
[0018] <Basic structure of absorbent articles>
[0019] The absorbent article according to the present embodiment may be a sanitary napkin, a diaper, a pad for light incontinence, etc. The basic structure of the absorbent article is described below by taking a sanitary napkin for nighttime use or long-term use as an example. Figure 1 , a top view of the absorbent article 1 is shown. Figure 2 Indicates along Figure 1 The cross-sectional diagram of line II, Figure 3 Indicates along Figure 1 Cross-sectional view of line II-II.
[0020] like Figures 1 to 3As shown, the absorbent article 1 has: a liquid-permeable top sheet 3, which is arranged on the side facing the skin of the wearer when wearing, that is, the skin side; and a liquid-impermeable back sheet 2, which is arranged on the non-skin side (underwear side) of the side opposite to the above-mentioned skin side. Furthermore, an absorbent (absorbent core) 4 is arranged between the back sheet 2 and the top sheet 3. These back sheets 2, absorbents 4 and top sheets 3 are laminated to form a main body (absorbent article main body) 8. The absorbent 4 is configured so that it will not extend from the back sheet 2 and the top sheet 3 when viewed from above. In addition, the edge of the back sheet 2 and the edge of the top sheet 3 can be joined by an adhesive, heat sealing, etc. at both ends of the length direction D1.
[0021] As shown in the figure, the absorbent article 1 is in the shape of an elongated pad (a shape in which the thickness is smaller than the width and length). In this specification, the longitudinal direction (front-back direction) of the absorbent article 1 is set as D1, and the transverse direction (left-right direction or width direction) orthogonal to the longitudinal direction D1 is set as D2. The longitudinal direction D1 is a direction corresponding to the front-back direction of the body of the wearer when wearing the absorbent article 1; the transverse direction D2 is a direction corresponding to the left-right direction of the body.
[0022] exist Figures 1 to 3 In the embodiment shown, the main body 8 has a plan view shape that is substantially line-symmetrical with respect to the center line (center line in the length direction) CL extending in the length direction D1, but the shape of the main body 8 is not necessarily line-symmetrical. In addition, the structure of the absorbent article 1 and the main body 8 other than the shape (including the thickness and density of the absorbent body 4, the size and position of the compressed grooves, the shape and size of the flap extending from the main body 8 in the transverse direction D2, etc.) may be substantially symmetrical with the center line CL as the axis of symmetry, or may be asymmetrical.
[0023] Back sheet 2 can be a sheet material with at least water-blocking property, for example, it can be a sheet material made of olefin resins such as polyethylene and polypropylene. In addition, a laminated nonwoven fabric laminated with nonwoven fabric on a polyethylene sheet, etc., and a laminated sheet of a nonwoven fabric that is substantially liquid-impermeable by a waterproof film therebetween can be used. In addition, from the viewpoint of preventing dampness, it is more desirable to use a sheet material with moisture permeability. As such a water-blocking and moisture permeable sheet material, a microporous sheet obtained by extending to one axis or two axes after melting and mixing an inorganic filler in an olefin resin such as polyethylene or polypropylene and molding a sheet can be used. Back sheet 2 can be a sheet material having the same outer shape as that of absorbent article 1.
[0024] The top sheet 3 is a liquid-permeable sheet that allows body fluids such as menstrual blood, leucorrhea, and urine to penetrate rapidly. As the top sheet 3, a nonwoven fabric with holes or holes or a porous plastic sheet can be appropriately used. As the raw material fiber constituting the nonwoven fabric, for example, the following materials can be used alone or in combination of two or more: synthetic fibers such as olefins such as polyethylene, polypropylene, polyester, and polyamide, regenerated fibers such as rayon and cuprammonium fibers, and blended fibers thereof, and natural fibers such as cotton. In addition, as the processing method of the nonwoven fabric, spunlace, spunbond, hot bond, meltblown, and needle punch are listed. Among these processing methods, it is preferred from the viewpoint that the spunlace can manufacture nonwoven fabrics rich in softness, the spunbond can manufacture nonwoven fabrics rich in drapability, and it is preferred from the viewpoint that the hot bond can manufacture bulky and soft nonwoven fabrics. In addition, composite fibers such as core-sheath type fibers, side-by-side fibers, and split fibers with a high melting point fiber as the core and a low melting point fiber as the sheath can also be used.
[0025] The absorbent 4 is not limited, as long as it is a material that can absorb and retain body fluids, and preferably includes cotton pulp and absorbent polymers. As absorbent polymers, superabsorbent polymer granular powder (superabsorbent polymer (SAP)), superabsorbent polymer fiber (superabsorbent fiber (SAF)) and combinations thereof can be used. As pulp, pulp composed of cellulose fibers such as chemical pulp and dissolving pulp obtained from wood, rayon, acetate and other artificial cellulose fibers can be listed. As raw materials for chemical pulp, broadleaf wood, coniferous wood, etc. can be used, but coniferous wood is suitable for use in terms of long fiber length and other aspects.
[0026] Synthetic fibers may also be mixed in the absorbent 4. As synthetic fibers, fibers mixed from two or more of the following materials can be used: polyolefins such as polyethylene or polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and copolymers thereof. In addition, composite fibers such as core-sheath type fibers, parallel type fibers, and split type fibers having a core with a fiber having a high melting point and a sheath with a fiber having a low melting point can also be used. In addition, hydrophilic agents can be used to surface-treat hydrophobic fibers to add fibers with affinity for body fluids. Preferably, the absorbent 4 is manufactured by fiber accumulation or airlaid method.
[0027] In the absorbent body 4, a plurality of absorbent body compression parts which are recessed from the top sheet 3 side to the back sheet 2 side can also be locally formed, and they are separated from each other when viewed from above. In addition, the absorbent body 4 can also be wrapped with a wrapping sheet formed by colored or non-colored (white) crepe paper or non-woven fabric, etc., to prevent it from folding and breaking or preventing the spilling of polymer particles, etc.
[0028] On both sides of the absorbent article 1, that is, on the side in the transverse direction D2, side panels 7, 7 are arranged on the skin side along the length direction D1. The side panels 7 can be made of raw materials that have been subjected to appropriate water-repellent treatment or hydrophilic treatment in whole or in part to prevent the penetration of body fluids or to correspond to the purpose of improving the touch of the skin. The side panels 7 preferably contain natural fibers, synthetic fibers, regenerated fibers, etc., or are non-woven fabrics composed of these fibers. When the side panels 7 are non-woven fabrics, they can be hot air non-woven fabrics, spunlace non-woven fabrics, spunbond non-woven fabrics, melt-blown non-woven fabrics, etc., and are preferably hot air non-woven fabrics from the perspective of being difficult to attach creases, difficult to produce wrinkles, and being soft and capable of improving the touch of the skin. It should be noted that for the side panels 7, water-repellent treatment can also be performed with water-repellent agents such as silicone and paraffin.
[0029] The side piece 7 may also be folded back on the inner side in the transverse direction D2 to form a multi-layered belt-shaped portion extending along the side of the main body 8. It should be noted that elastic stretchable components may be arranged in an extended state along the length direction D1 between the multi-layers to form wrinkles. The description of the folding back and wrinkle structure of the side piece 7 is omitted in this specification, and the illustration is also omitted in the drawings.
[0030] The absorbent article 1 may include: a body fluid discharge outlet facing region C, which faces the body fluid discharge outlet (the example shown is the vaginal opening) of the wearer when worn; a front region F, which is adjacent to the front of the body fluid discharge outlet facing region C and is a region extending to the front end of the absorbent article 1; a perineum facing region (middle region) M, which is adjacent to the rear of the body fluid discharge outlet facing region C and is facing the vicinity of the perineum of the wearer when worn; and a buttocks facing region B, which is adjacent to the rear of the perineum facing region M, is a region extending to the rear end of the absorbent article 1, and faces the buttocks of the wearer when worn. Furthermore, the buttocks facing region B includes: a front buttocks facing region B1, which is adjacent to the perineum facing region M; and a rear buttocks facing region B2, which is adjacent to the rear of the front buttocks facing region B1. The front buttocks facing region B1 is mainly a region facing the gluteal groove (groove of the buttocks), that is, a region facing the part including the anus. The rear buttocks facing area B2 may be a portion behind the gluteal groove or further behind the rear end of the gluteal groove, and in particular, may be a portion facing the boundary between the buttocks and the legs that is further behind the gluteal groove (above when standing). It should be noted that the description of the facing relationship between the area of the main body 8 and the wearer's body can be set as a general range when the wearer wears the absorbent article in the usual wearing manner when lying down, and is only a rough reference.
[0031] The length D1 of the region C facing the body fluid discharge outlet can be 50 to 120 mm, and the length D1 of the region B facing the buttocks can be 90 to 230 mm. In addition, according to the structure of the present embodiment, for example, the total length of the perineum facing region M and the buttocks facing region B is preferably the length of the buttocks facing region B in the length direction D1, which is larger than the length of the wing WF in the length direction D1 and is longer at the rear. In addition, the length D1 of the front buttocks facing region (gluteal groove facing region) B1 in the length direction D1 can be 40 to 100 mm, and the length D1 of the rear buttocks facing region B2 in the length direction D1 can be 40 to 120 mm. In addition, the total length of the absorbent article 1 in the length direction D1 can be 250 to 450 mm.
[0032] The absorbent article 1 may have a pair of wings WF, WF, which extend outward in the transverse direction D2 from the two sides of the area C facing the body fluid discharge port. On the non-skin side of the wings WF, WF, a deviation prevention material (not shown) may be provided. When worn, the wings WF, WF can be folded back to the non-skin side and attached to the underwear through the deviation prevention material, so that the wings WF, WF and the main body 8 can be used to clamp the underwear. In this way, the absorbent article 1 is reliably fixed to the underwear. The wings WF, WF are formed by joining the extension portions of the side panels 7, 7 extending outward in the transverse direction D2 to the extension portions of the back sheet 2 extending outward in the transverse direction D2.
[0033] In addition, a pair of buttocks retaining sheets HF, HF may be formed, which extend from the perineum facing area M to the buttocks facing area B and extend outward from the side of the main body 8 in the transverse direction D2. The buttocks retaining sheets HF, HF prevent body fluids from leaking out from the rear of the absorbent article 1 and expand the contact area with the buttocks, thereby also having the function of making the entire absorbent article 1 less likely to shift relative to the underwear, especially less likely to shift in the transverse direction D2, and stabilizing the wearing position of the absorbent article 1. The buttocks retaining sheets HF, HF may also be formed by joining the extension portion of the side sheets 7, 7 extending outward in the transverse direction D2 and the extension portion of the back sheet 2 extending outward in the transverse direction D2.
[0034] <Specific composition of absorber>
[0035] Figure 4 Indicates Figure 1 FIG. 1 is a top view of the absorbent article 1 with the top sheet 3 and the side sheets 7, 7 removed and the absorbent body 4 exposed. Figure 4As shown, the basis weight of the absorbent body 4, specifically, the pulp basis weight is not uniform as a whole, but varies depending on the location. For example, the absorbent body 4 mainly includes: a medium basis weight portion 4M having a medium pulp basis weight; a high basis weight portion 4H having a higher pulp basis weight than the medium basis weight portion 4M; and a low basis weight portion 4L having a lower pulp basis weight than the medium basis weight portion 4M. In addition, the low basis weight portion 4L includes: a front low basis weight portion 4Lf, which is arranged in the perineum-facing region M and has the same width as the absorbent body 4; and an elongated rear low basis weight portion 4Lb, which is arranged in the center of the gluteal groove-facing region B1 in the transverse direction D2. It is preferred that the front low basis weight portion 4Lf and the rear low basis weight portion 4Lb are formed continuously.
[0036] It should be noted that, for the high basis weight portion 4H, the middle basis weight portion 4M and the low basis weight portion 4L, each portion may be a basis weight uniform region with an almost uniform basis weight. If the basis weight in a specified portion or a specified region is almost uniform, it means that even if there are portions with slightly different basis weights, the difference between the average value of the basis weight in the specified portion or the specified region and that in the average value of the basis weight is less than 20%, preferably less than 10%, and more preferably less than 5%. The front low basis weight portion 4Lf and the rear low basis weight portion 4Lb may have different basis weights and have almost uniform basis weights respectively. At this time, the basis weight of the rear low basis weight portion 4Lb may be slightly smaller than that of the front low basis weight portion 4Lf.
[0037] The absorbent body 4 contains pulp and water-absorbent polymer as described above, and the basis weight of the water-absorbent polymer is preferably the same in the entire absorbent body 4. In this case, the basis weight relationship is reflected by the basis weight relationship of the pulp.
[0038] For the rear low basis weight portion 4Lb formed in the gluteal groove facing region B1, refer to Figure 5 To explain further. Figure 5 The cross section (equivalent to Figure 1 Schematic diagram of II line section) together with the wearer's buttocks Den. Figure 5 In the figure, illustration of specific components such as a sheet included in the absorbent article 1 is omitted.
[0039] The rear low base weight portion 4Lb is softer and has lower rigidity to bending than the side portion thereof, that is, the middle base weight portion 4M on the outside in the transverse direction D2. Therefore, the gluteal groove facing area B1 receives a force from the outside in the transverse direction D2 ( Figure 5 In the case of the arrow from the outside of the lateral direction D2 in the figure), for example, when the force from the two legs is affected, or when the wearer deforms the main body by himself, the rear low basis weight portion 4Lb is easily raised toward the skin side to form a mountain portion Mt ( Figure 5(a)). In addition, the rear low basis weight portion 4Lb is an elongated shape along the longitudinal direction D1, and its transverse direction D2 length (width of the rear low basis weight portion 4Lb) is 5% to 25% of the transverse direction D2 length of the absorbent body 4 (width of the absorbent body 4). Therefore, this narrow width of the rear low basis weight portion 4Lb is also a size that is easy to enter the gluteal groove. Therefore, when the main body is deformed in a manner to enter the gluteal groove when worn, it can fit tightly even in the deep part of the gluteal groove ( Figure 5 (b)). In order to improve the fit with the buttocks, it is also considered to make the gluteal groove facing area B1 not very raised and to improve the close fit with the gluteal groove. However, if a gap is generated between the gluteal groove facing area B1 and the gluteal groove, there is a possibility of so-called downstream leakage, in which body fluids leak out to the rear or oblique rear of the gluteal groove downstream of the gluteal groove due to the wearer's wearing style, the wearer's movement, etc. In contrast, in the present embodiment, the rear low basis weight portion 4Lb can be made to fit closely to the gluteal groove. Furthermore, unlike the slit, the rear low basis weight portion 4Lb is a portion where the absorbent body is present, so it can absorb body fluids immediately. Therefore, downstream leakage can be effectively prevented. It should be noted that in recent years, most wearers of absorbent articles for nighttime or long-term use will deform the absorbent articles in advance so that the main body is deeply and closely fitted into the gluteal groove before wearing them. The absorbent article 1 according to the present embodiment is suitable for such a usage form.
[0040] like Figure 4 As shown, the rear low basis weight portion 4Lb is surrounded by the middle basis weight portion 4M on both sides and the rear of the rear low basis weight portion 4Lb. In this way, the extension range of the length direction D1 of the rear low basis weight portion 4Lb can be configured to extend to the front of the rear end of the absorbent body 4, preferably to the same length direction D1 as the gluteal groove facing area B1. Therefore, it is possible to suppress the mountain portion Mt ( Figure 5 ) is too long to the rear. Therefore, the body can be adapted to the shape of the shallower portion of the gluteal groove behind the buttocks, or near the end of the gluteal groove or behind the end. In this way, the fit from the gluteal groove to the portion near the end of the gluteal groove or behind the end of the gluteal groove can be improved.
[0041] It should be noted that the width (length in the transverse direction D2) x ( Figure 4 ) is preferably 5 to 30 mm, more preferably 10 to 20 mm. With the above width x, it is easy to deform in a manner to form the mountain portion Mt, and the size of the mountain portion Mt entering the gluteal groove can be adjusted. In addition, the length (length in the longitudinal direction D1) y ( Figure 4) is preferably 40 to 80 mm, more preferably 50 to 70 mm. The above length y can provide a length of the mountain portion Mt that can absorb body fluids in the gluteal groove, and can prevent the mountain portion Mt from continuing backward and hindering the close fit at a shallow position in the gluteal groove.
[0042] The ratio (y / x) of the length y to the width x of the rear low basis weight portion 4Lb may be 2 to 8. The size of the rear low basis weight portion 4Lb obtained by this ratio is used to obtain a shape suitable for closely fitting the gluteal groove.
[0043] At least the basis weight of the rear low basis weight portion 4Lb is preferably 200 to 500 gsm, more preferably 300 to 400 gsm. In addition, the basis weight of the middle basis weight portion 4M adjacent to the side and rear of the rear low basis weight portion 4Lb is preferably 300 to 600 gsm, more preferably 400 to 500 gsm. It should be noted that from the viewpoint of enhancing the above-mentioned effect produced by the rear low basis weight portion 4Lb, the basis weight of the rear low basis weight portion 4Lb may be 60 to 90% of the basis weight of the middle basis weight portion 4M.
[0044] <Compression groove>
[0045] like Figures 1 to 3 As shown, the main body 8 of the absorbent article 1 of the present embodiment may be formed with a compression groove (also called fit embossing) formed by compressing at least the top sheet 3 and the absorbent body 4 from the top sheet 3 side. The compression groove has the function of introducing and retaining body fluids, so it can be helpful to prevent the spread of body fluids or induce body fluids. In the illustrated example, the compression groove may include a plurality of compression grooves (illustrated by reference numerals 10, 11, 12, and 13). The compression groove may be formed to be linearly symmetrical with the longitudinal center line CL of the absorbent article 1 as the symmetry line when viewed from above, but it does not necessarily have to be linearly symmetrical. The compression groove can be formed, for example, by passing a laminate formed by laminating at least the top sheet 3 and the absorbent body 4 between a pair of pressure rollers. At this time, a convex roller can be arranged on the top sheet 3 side of the above-mentioned laminate, a flat roller can be arranged on the absorbent body 4 side of the laminate, and the two rollers can be clamped and pressurized. It should be noted that the compression groove may include: a low compression portion; and a high compression portion which is compressed at a higher pressure than in the low compression portion. In the drawings, the high compression portion is indicated in black.
[0046] Figure 1In the embodiment shown, the pair of central compressed grooves 10, 10 mainly extend along the longitudinal direction D1 from the body fluid discharge port facing region C to the perineum facing region M. The pair of central compressed grooves 10, 10 are formed separately from each other on both sides of the longitudinal centerline CL. The pair of central compressed grooves 10, 10 are arranged so as not to overlap with the high basis weight portion 4H. The separation distance between the pair of central compressed grooves 10, 10 in the transverse direction D2 can be either constant or variable. For example, Figure 1 As shown, it can be set to be small near the boundary between the body fluid discharge port facing region C and the perineum facing region M, and set to be large again behind it, and become smaller toward the rear.
[0047] A first rear compression groove (rear compression groove) 11 is formed behind a pair of central compression grooves 10, 10, which is separated from the pair of central compression grooves 10, 10. Preferably, the first rear compression groove 11 is formed in the buttocks facing region B, mainly in the gluteal groove facing region B1. The first rear compression groove 11 is formed across the longitudinal center line CL, and has an overall shape that bulges backward. More specifically, the first rear compression groove 11 includes a horseshoe-shaped compression groove 11h, which has a horseshoe shape overlapping the longitudinal center line CL (or a shape in which the ends in a U are close to each other). The first rear compression groove 11 may also have a shape including lateral compression grooves 11s, 11s, which branch from the sides of the horseshoe-shaped compression groove 11h and extend forward.
[0048] A second rear compression groove (second compression groove) 12 is formed behind the first rear compression groove 11 and is separated from the first rear compression groove 11. The second rear compression groove 12 is a groove extending along the lateral direction D2 and has a shape that bulges toward the rear. In addition, a front compression groove 13 is formed in front of the pair of central compression grooves 10, 10. Figure 1 In the example shown, the front compressed groove 13 has a closed shape formed by combining compressed grooves that are convex and curved toward the front with different curvature radii.
[0049] Figure 6 Indicated in Figure 1 This is an enlarged view of the region where the rear low basis weight portion 4Lb is arranged in the middle absorbent body 4 and its vicinity. Figure 6 As shown in FIG. 1 , the first rear compression groove 11, more specifically, the horseshoe-shaped compression groove 11h, is formed in a manner to surround the rear end portion of the rear low basis weight portion (elongated low basis weight portion) 4Lb. As described above, when the rear low basis weight portion 4Lb is subjected to a force from the outside in the lateral direction D2 during wearing, it will bulge toward the top sheet 3 side and can be deformed into a mountain portion Mt ( Figure 5). The obtained mountain portion Mt is interrupted at the first rear compression groove 11 extending in the transverse direction D2, so that the mountain portion Mt can be further prevented from being too long to the rear. In addition, the area behind the first rear compression groove 11 can fit the shallow part of the gluteal groove or the part without gluteal groove, so that the body fluid can be prevented from leaking to the rear or oblique rear.
[0050] In addition, the body fluid transferred from the rear low basis weight part 4Lb to the rear or oblique rear can be blocked by the first rear compression groove 11, so the effect of preventing leakage can be improved by this blocking effect. In addition, the body fluid diffused from the rear low basis weight part 4Lb to the side middle basis weight part 4M is also blocked by the side compression grooves 11s, 11s extending almost along the length direction D1 after branching from the horseshoe-shaped compression groove 11h. Therefore, even if a large amount of body fluid is transferred to the rear low basis weight part 4Lb, it can be prevented from leaking obliquely to the rear. From the viewpoint of improving the effect of this blocking, it is preferred that the front ends 11st, 11st of the side compression grooves 11s, 11s are located forward of the center of the length direction D1 of the rear low basis weight part 4Lb, and can be located at a position less than 30% of the length y of the length direction D1 of the rear low basis weight part 4Lb, preferably less than 25%, from the front end of the rear low basis weight part 4Lb.
[0051] Furthermore, when comparing the density (pulp density) of the rear low basis weight portion 4Lb and the density (pulp density) of the middle basis weight portion 4M on the side of the rear low basis weight portion 4Lb and surrounded by the side compression grooves 11s, it is preferred that the density of the rear low basis weight portion 4Lb is lower. That is, compared with the side and rear portions of the rear low basis weight portion 4Lb, it is preferred that the rear low basis weight portion 4Lb is a portion with a smaller pulp basis weight and a lower pulp density. This further promotes the transfer of body fluid from the rear low basis weight portion 4Lb to the middle basis weight portion 4M on its side ( Figure 6 The average pulp density of the rear low basis weight portion 4Lb is preferably 0.035 to 0.1 g / cm 3 , more preferably 0.05 to 0.08 g / cm 3 In addition, the pulp density of the region surrounded by the side compression grooves 11s (a part of the middle basis weight portion 4M) on the side of the rear low basis weight portion 4Lb is preferably 0.055 to 0.15 g / cm on average. 3 , more preferably 0.07 to 0.12 g / cm 3 .
[0052] The distribution of pulp density in the gluteal groove facing region B1 as described above makes the absorption and diffusion of body fluids smoother. Figure 6As shown, the body fluid directly absorbed by the rear low basis weight portion 4Lb, or the body fluid diffused from the body fluid outlet facing area C and the perineum facing area M into the absorbent body 4, is further transferred to the rear in the rear low basis weight portion 4Lb along the longitudinal center line CL ( Figure 6 Here, diffusion from the rear low basis weight portion 4Lb with relatively low pulp density to the middle basis weight portion 4M with relatively high pulp density arranged on the side thereof is also promoted and obtained ( Figure 6 ). Therefore, the side portion of the absorbent body 4 in the gluteal groove facing region B1 can be effectively utilized, and the amount of body fluid transfer to the rear can be suppressed.
[0053] Preferably, the rear low basis weight portion 4Lb extends in the length direction D1 from at least the rear ends 10bt, 10bt of the pair of central compressed grooves 10, 10 to the front ends 11ft, 11ft of the horseshoe-shaped compressed groove 11h of the first rear compressed groove 11. In addition, preferably, the side portion (outer edge in the transverse direction D2) of the rear low basis weight portion 4Lb contacts or slightly overlaps with the rear ends 10bt, 10bt of the pair of central compressed grooves 10, 10. Figure 6 ). Thus, when the rear low basis weight portion 4Lb is deformed so as to bulge toward the top sheet 3 side during wearing ( Figure 5 ), the rear ends 10bt, 10bt of the pair of central compression grooves 10, 10 can serve as base points for bulging in front of the rear low basis weight portion 4Lb. In addition, it is preferred that the side portion (outer edge in the transverse direction D2) of the rear low basis weight portion 4Lb contacts or slightly overlaps with the front ends 11ft, 11ft of the horseshoe-shaped compression groove 11h of the first rear compression groove 11 ( Figure 3 and Figure 6 ). Thus, when the rear low basis weight portion 4Lb is deformed so as to bulge toward the top sheet 3 side during wearing ( Figure 5 ), the front ends 11ft, 11ft of the horseshoe-shaped compression groove 11h of the first rear compression groove 11 can become the base point for the rear low base weight portion 4Lb to bulge. Therefore, from the viewpoint of forming a base point for the rear low base weight portion 4Lb to bulge at the rear, it is preferred that the front ends 11ft, 11ft of the horseshoe-shaped compression groove 11h of the first rear compression groove 11 are located further back than the center in the length direction D1 of the rear low base weight portion 4Lb. It should be noted that, in the case where the rear low base weight portion 4Lb slightly overlaps the central compression grooves 10, 10 or the first rear compression groove 11, it is preferred not to overlap with the high compression portion (black) from the viewpoint of not hindering the bulge of the rear low base weight portion 4Lb.
[0054] Regarding the above-mentioned positional relationship between the rear low basis weight portion 4Lb and the pair of central compressed grooves 10, 10, in other words, it is preferred that the length x of the rear low basis weight portion 4Lb in the transverse direction D2 is substantially equal to the distance d10 between the rear ends 10bt, 10bt of the pair of central compressed grooves 10, 10. Furthermore, regarding the positional relationship between the rear low basis weight portion 4Lb and the horseshoe-shaped compressed groove 11h of the first rear compressed groove 11, it is preferred that the length x of the rear low basis weight portion 4Lb in the transverse direction D2 is substantially equal to the distance d11 between the front ends 11ft, 11ft of the horseshoe-shaped compressed groove 11h of the first rear compressed groove 11. Here, substantially equal means that when there is a difference between the two, the difference is less than 10% of the larger one of the two, preferably less than 5%.
[0055] The rear end of the rear low basis weight portion 4Lb may be separated from the first rear compressed groove 11 in a plan view, but is preferably in contact with the first rear compressed groove 11, or as shown in FIG. Figure 6 Overlap as shown. In addition, it is preferred to contact the rear end of the first rear compression groove 11, that is, extend to the apex of the horseshoe-shaped compression groove 11h, so as to contact or overlap with the position of the apex of the horseshoe-shaped compression groove 11h. As a result, the body fluid diffused to the rear in the rear low base weight portion 4Lb can be easily and quickly introduced into the first rear compression groove 11. Moreover, the liquid introduced into the first rear compression groove 11 is first induced to go in the extension direction of the horseshoe-shaped compression groove 11h, that is, to go to the outside of the lateral direction D2 and closer to the front. In addition, a part of the body fluid can also be induced to go forward along the side compression grooves 11s, 11s. Therefore, the effect of preventing leakage to the rear is improved.
[0056] It should be noted that when the buttocks-facing region B is bent along the buttocks during wearing, the body 8 can be bent along the first rear compression groove 11, and can be three-dimensionally bent along the roundness of the buttocks. Figure 6 ) are recessed portions 11r, 11r recessed forward, so when the buttocks are bent toward the area B, the recessed portions 11r, 11r also become the base points of the bending, thereby forming a smoother curve.
[0057] The present invention has been described above based on the embodiments, but the present invention is not limited to these embodiments. In addition, the above-mentioned embodiments can be variously changed, modified, replaced, added, deleted, and combined within the scope of the patent application, which also belong to the technical scope of the present invention.
[0058] Furthermore, specific aspects of the present invention are described below.
[0059] (Note 1)
[0060] The form of Note 1 is an absorbent article having an elongated main body, the main body including a top sheet on the skin side, a back sheet on the side opposite to the skin side, i.e., the non-skin side, and an absorbent body arranged between the top sheet and the back sheet, wherein in the gluteal groove facing area which faces the gluteal groove of the wearer when worn, on the center line of the main body extending along the length direction, there is a low basis weight portion elongated in the length direction, the pulp basis weight of the absorbent body in the low basis weight portion is at least lower than the pulp basis weight on the side and rear of the low basis weight portion, the width of the low basis weight portion is 5% to 25% of the width of the absorbent body, and at least on the top sheet and the absorbent body, a compression groove is formed which is recessed from the top sheet side to the back sheet side, the compression groove includes a rear compression groove which is convex toward the rear and surrounds the rear end portion of the low basis weight portion.
[0061] According to the form of the above-mentioned note 1, the low basis weight portion formed in the area facing the gluteal groove is easier to bend than the part outside in the transverse direction, so when a force is applied from the outside in the transverse direction, the center in the transverse direction of the area facing the gluteal groove is easy to bulge toward the top sheet side, and a mountain portion can be formed. In addition, the low basis weight portion has a slender shape with a relatively narrow width, so the above-mentioned mountain portion formed by the deformation of the low basis weight portion becomes a size that is easy to enter the gluteal groove. The low basis weight portion is also soft to bend in the longitudinal direction, so it is easy to fit closely along the shape of the gluteal groove, thereby preventing the so-called downstream leakage of body fluids from the gluteal groove. In addition, the low basis weight portion is the part where the absorbent body is present, so the low basis weight portion can absorb body fluids immediately. Therefore, compared with the deformation of the main body by providing slits and through grooves, the effect of preventing leakage is higher.
[0062] In addition, the low basis weight portion is a portion having a lower pulp basis weight than the portion behind it, that is, the low basis weight portion is a portion having a rear end in the middle of the absorbent body. Therefore, the mountain portion along the length direction formed by the bulge of the low basis weight portion can be prevented from extending too far backward. Therefore, the portion behind the low basis weight portion is easy to fit the rear portion of the gluteal groove of the wearer where the gluteal groove is shallow, or the portion behind the end position of the gluteal groove.
[0063] In addition, in this embodiment, a rear compression groove is formed so as to surround the rear end of the low basis weight portion. The rear compression groove can enhance the effect of suppressing the rearward continuation of the mountain portion formed by the low basis weight portion at the rear of the low basis weight portion. In addition, the compression groove has the function of introducing and retaining body fluids, so the rear compression groove can prevent leakage to the rear, further rear, or obliquely rear.
[0064] (Note 2)
[0065] In the embodiment of Supplementary Note 2, the rear end portion of the low basis weight portion is in contact with or overlaps with the rear compressed groove in a plan view.
[0066] According to the embodiment of Supplementary Note 2, the body fluid diffused from the low basis weight portion to the rear is easily introduced into the rear compressed groove. The body fluid introduced into the rear compressed groove is easily guided along the extending direction of the rear compressed groove. That is, it is easily guided in the direction further forward from the lateral direction. Therefore, according to this embodiment, the effect of preventing the body fluid from transferring to the rear can be improved.
[0067] (Note 3)
[0068] In the form of Note 3, the compression groove also includes a pair of central compression grooves separated from each other in the lateral direction, and the pair of central compression grooves are formed in front of the rear compression groove in a manner separated in the length direction, and the low basis weight portion extends from at least a position between the rear ends of the pair of central compression grooves to a position between the front ends of the rear compression grooves.
[0069] According to the form of the above-mentioned note 3, a pair of central compression grooves are used to promote the deformation of the area in front of the gluteal groove area, that is, the area facing the perineum or the body fluid outlet in the front, and the body fluid can be induced to go in the length direction. In addition, the low basis weight portion forms a discontinuous area of compression grooves in a manner of separating a pair of central compression grooves from the rear compression grooves, so the softness of the low basis weight portion and its surrounding area can be ensured. Therefore, the above-mentioned effect of deforming the low basis weight portion in a manner of bulging toward the top sheet side and forming a mountain portion and also bending softly in the length direction can be improved. In addition, the end (rear end) of a pair of central compression grooves is arranged on the front side of the low basis weight portion, and the end (front end) of the rear compression groove is arranged on the rear side of the low basis weight portion, so that the end of four compression grooves (two in the front and two in the rear) is used as a base point, which is conducive to the bulge of the low basis weight portion.
[0070] (Note 4)
[0071] In the form of Note 4, the rear compression groove includes: a horseshoe-shaped compression groove, which surrounds the rear end portion of the low base weight portion; and a pair of side compression grooves, which branch out from the horseshoe-shaped compression groove in the lateral direction and extend along the length direction, and the front ends of the pair of side compression grooves are located forward of the center of the length direction of the low base weight portion.
[0072] According to the embodiment of Supplement 4, the lateral compressed grooves surround the area extending laterally at least in the rear half of the low basis weight portion. Therefore, the lateral compressed grooves prevent body fluids from diagonally ...
[0073] This application claims priority based on Japanese invention patent application No. 2022-088309 filed on May 31, 2022, the entire contents of which are incorporated herein by reference.
[0074] Description of Reference Numerals
[0075] 1. Absorbent articles (sanitary napkins)
[0076] 2 Back piece
[0077] 3 Top sheet
[0078] 4 Absorber
[0079] 4H High basis weight portion of the absorbent
[0080] 4L Low basis weight section of absorbent body
[0081] 4Lf Front Low Basis Weight
[0082] 4Lb rear low basis weight section (slender low basis weight section)
[0083] 4M absorbent mid-weight
[0084] 7 Side panels
[0085] 8 Main body (absorbent article main body)
[0086] 10 Central compression groove
[0087] 10bt rear end of central compression tank
[0088] 11 First rear compression groove
[0089] 11ft Front end of first rear compression tank
[0090] 11s side compression slots
[0091] 11st Front end of the side compression groove
[0092] 11r Depression
[0093] 11h Horseshoe shaped compression groove
[0094] 12 Second rear compression slot
[0095] 13 Front compression slot
[0096] B Hip-to-hip area
[0097] B1 Anterior buttocks facing area (gluteal groove facing area)
[0098] B2 Rear buttocks area
[0099] C Area facing the body fluid outlet
[0100] CL Length center line
[0101] D1 Length direction
[0102] D2 Horizontal direction
[0103] F Front Area
[0104] HF Hip Retention Plate
[0105] M Middle area (area facing the perineum)
[0106] WF Wing.
Claims
1. An absorbent article having an elongated main body, the main body comprising a top sheet on the skin side, a back sheet on the side opposite to the skin side, i.e., a non-skin side, and an absorbent body arranged between the top sheet and the back sheet, wherein: In a gluteal groove-facing region facing the gluteal groove of the wearer when worn, on a center line of the main body extending in the longitudinal direction, there is a low basis weight portion elongated in the longitudinal direction, the pulp basis weight of the absorbent body in the low basis weight portion is lower than the pulp basis weight at least on the sides and rear of the low basis weight portion, The width of the low basis weight portion is 5% to 25% of the width of the absorbent body. At least the top sheet and the absorbent body are provided with compressed grooves recessed from the top sheet side toward the back sheet side, the compressed grooves including rear compressed grooves convexly shaped rearwardly surrounding the rear end portion of the low basis weight portion.
2. The absorbent article according to claim 1, wherein A rear end portion of the low basis weight portion contacts or overlaps with the rear compressed groove in a plan view.
3. The absorbent article according to claim 1 or 2, wherein: The compression groove further includes a pair of central compression grooves separated from each other in the lateral direction, wherein the pair of central compression grooves are formed in front of the rear compression groove in a manner separated in the length direction. The low basis weight portion extends at least from a position between rear ends of the pair of central compressed grooves to a position between front ends of the rear compressed grooves.
4. The absorbent article according to claim 1 or 2, wherein: The rear compression groove includes: a horseshoe-shaped compression groove surrounding the rear end of the low basis weight portion; and a pair of side compression grooves branching outwardly from the horseshoe-shaped compression groove in the transverse direction and extending along the length direction. The front ends of the pair of side compressed grooves are located forward of the center in the longitudinal direction of the low basis weight portion.