Absorbent articles

Abstract

To provide an absorbent article that can suppress fuzzing of the top sheet fibers, leakage of bodily fluids, and stickiness of the top sheet. [Solution] The absorbent article (1) has a top sheet (10) that is aligned in a planar direction including a first direction (D1) and a second direction (D2) that are mutually orthogonal, a second sheet (25) that abuts the non-skin side surface of the top sheet, an absorbent core (31) located on the non-skin side of the second sheet, and a back sheet (20). The top sheet and the second sheet are bonded together by a first adhesive portion (71) and a second adhesive portion (72) which has a different shape from the first adhesive portion. The first adhesive portion extends in at least the first direction and is arranged in multiples at intervals in the second direction. The second adhesive portion extends in the first direction while swinging in the second direction and is arranged in multiples at intervals in the second direction. The second adhesive portion straddles multiple first adhesive portions arranged at intervals in the second direction.

Description

Technical Field

[0001] The present invention relates to absorbent articles.

Background Art

[0002] Patent Document 1 discloses an absorbent article having a topsheet and a second sheet (intermediate sheet), wherein the topsheet and the second sheet are adhered by an adhesive. The adhesive for adhering the topsheet and the second sheet in Patent Document 1 is arranged in a predetermined pattern in plan view. The predetermined pattern is an omega pattern, a wave pattern or a spiral pattern.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

[0004] The pattern of the adhesive between the topsheet and the second sheet is a curved shape such as an omega pattern, a wave pattern or a spiral pattern, and regions where the adhesive is not arranged are spaced apart both in the longitudinal direction and in the width direction, and the drawing property of body fluid can be ensured in these regions. On the other hand, in the regions where the adhesive is not arranged, the topsheet is likely to move with respect to the second sheet, and there is a possibility that fuzzing of the fibers of the topsheet may occur.

[0005] Further, as another pattern of the adhesive, there is a linear pattern extending in a certain direction such as the longitudinal direction. In the linear pattern extending in a certain direction, when a force in the orthogonal direction orthogonal to the certain direction is applied, it deforms in the orthogonal direction so that the interval between the adhesives becomes narrower, and the topsheet may lift up in the portion where there is no adhesive. A gap may occur between the topsheet and the second sheet, resulting in a decrease in the absorption speed, and may lead to stickiness of the topsheet and leakage of body fluid.

[0006] This invention has been made in view of these problems, and aims to provide an absorbent article that can suppress fuzzing of the top sheet fibers, leakage of bodily fluids, and stickiness of the top sheet. [Means for solving the problem]

[0007] An absorbent article according to one embodiment includes a top sheet that contacts the wearer's skin along a planar direction including a first and second direction which are mutually orthogonal, a second sheet that contacts the non-skin side of the top sheet, an absorbent core positioned on the non-skin side of the second sheet, and a back sheet positioned on the non-skin side of the absorbent core. The top sheet and the second sheet are bonded together by a first adhesive portion where adhesive is provided, and a second adhesive portion where adhesive is provided in a shape different from that of the first adhesive portion. The first adhesive portion extends at least in the first direction and is arranged in multiples at intervals in the second direction. The second adhesive portion extends in the first direction while swinging in the second direction and is arranged in multiples at intervals in the second direction. The second adhesive portion straddles the multiple first adhesive portions arranged at intervals in the second direction. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a plan view of the absorbent article according to the first embodiment, as seen from the skin side. [Figure 2] Figure 2 is a cross-sectional view along line AA shown in Figure 1. [Figure 3] Figure 3 shows the first adhesive joint. [Figure 4] Figure 4 shows the second adhesive portion. [Figure 5] Figure 5 shows both the first and second adhesive portions. [Figure 6] Figure 6 is a schematic enlarged view of section B shown in Figure 5. [Figure 7] Figure 7 shows the third adhesive joint. [Figure 8] Figure 8 is a diagram illustrating a modified example. [Figure 9] Figure 9 is a front view of an absorbent article according to the second embodiment. [Figure 10] Figure 10 is a cross-sectional view of the absorbent article according to the second embodiment, passing through the center in the front-to-back direction and along the width direction. [Modes for carrying out the invention]

[0009] (1) Outline of the Embodiment The following matters become clear from this specification and the accompanying drawings: The invention according to Embodiment 1 is an absorbent article. The absorbent article has a top sheet that contacts the wearer's skin along a planar direction including a first direction and a second direction which are mutually orthogonal, a second sheet that contacts the non-skin side of the top sheet, an absorbent core positioned on the non-skin side of the second sheet, and a back sheet positioned on the non-skin side of the absorbent core. The top sheet and the second sheet are bonded together by a first adhesive portion where adhesive is provided, and a second adhesive portion where adhesive is provided in a different shape from the first adhesive portion. The first adhesive portion extends at least in the first direction and is arranged in multiples spaced apart in the second direction. The second adhesive portion extends in the first direction while swinging in the second direction and is arranged in multiples spaced apart in the second direction. The second adhesive portion straddles the multiple first adhesive portions that are arranged spaced apart in the second direction.

[0010] In the second adhesive portion, areas without adhesive are spaced apart in both the first and second directions. However, since the first adhesive portion is located in a part of the area without adhesive, the top sheet becomes less likely to move relative to the second sheet, and the fluffing of the top sheet's fibers can be suppressed. The first adhesive portion extends in the first direction and is spaced apart in the second direction. Because the second adhesive portion spans multiple first adhesive portions, even if the absorbent article is subjected to force in the second direction and deforms in such a way that the gaps between the first adhesive portions narrow, the second adhesive portion, which extends in the second direction and spans the first adhesive portions, can prevent the top sheet from lifting. As a result, the gap between the top sheet and the second sheet is reduced, and the decrease in absorption speed and stickiness of the top sheet can be suppressed. In other words, by providing both the first and second adhesive portions, fluffing of the top sheet's fibers, a decrease in absorption speed, and stickiness of the top sheet can be suppressed.

[0011] In a preferred embodiment, the invention according to Embodiment 2 may have the following features in the invention according to Embodiment 1: The first adhesive portion is linear in shape extending along the first direction. Because the first adhesive portion is linear in shape extending along the first direction, intersections where the second adhesive portion and the first adhesive portion intersect can be provided at intervals in the first direction, thereby suppressing movement of the top sheet relative to the second sheet and lifting of the top sheet throughout the entire first direction.

[0012] In a preferred embodiment, the invention according to embodiment 3 may have the following features in the invention according to embodiment 1 or embodiment 2: The thickness of the first adhesive portion disposed within the top sheet is greater than the thickness of the second adhesive portion disposed within the top sheet. Because the first and second adhesive portions are disposed within the top sheet, the fibers can be restrained by the adhesive within the thickness direction of the top sheet, and even if the fibers break within the top sheet, the fraying of the fibers can be suppressed. Furthermore, because the first adhesive portion is thick and the second adhesive portion is thin, the fraying of the fibers can be suppressed by the thicker first adhesive portion, while ensuring the flow of bodily fluids within the top sheet in the area overlapping with the thinner second adhesive portion.

[0013] In a preferred embodiment, the invention according to Embodiment 4 may have the following features in the invention according to any one of Embodiments 1 to 3: At least one of the width of the first adhesive portion in a direction perpendicular to the direction in which the first adhesive portion extends, and the width of the second adhesive portion in a direction perpendicular to the direction in which the second adhesive portion extends, is greater than the average fiber diameter of the top sheet. According to this embodiment, the fibers can be restrained by at least one of the first adhesive portion and the second adhesive portion, making it easier to suppress fuzzing of the fibers of the top sheet.

[0014] In a preferred embodiment, the invention according to Embodiment 5 may have the following features in the invention according to any of Embodiments 1 to 4: The second adhesive portions adjacent to each other in the second direction are spaced apart in the second direction. The length of the second adhesive portion in the second direction is longer than the distance between adjacent second adhesive portions. According to this embodiment, the gap between the second adhesive portions can be reduced, and the lifting of the top sheet can be further suppressed.

[0015] In a preferred embodiment, the invention according to embodiment 6 may have the following features in the invention according to any of embodiments 1 to 5. In the region outside the absorbent core in the planar direction, the top sheet and the back sheet are bonded together by the first adhesive portion, the second adhesive portion, and the third adhesive portion. According to this embodiment, the widthwise end of the top sheet and the front-to-back end of the top sheet are firmly bonded together by the first adhesive portion, the second adhesive portion, and the third adhesive portion. Therefore, even when force is applied to the outside of the absorbent article in the widthwise direction or in the front-to-back direction, the lifting of the top sheet can be suppressed, and the fuzzing of the top sheet can be further suppressed.

[0016] According to a preferred embodiment, the invention according to aspect 7 may have the following features in the inventions according to aspects 1 to 6. It is disposed on the non-skin side of the absorption core and has a crotch stretchable member that stretches and contracts in the front-rear direction. The first adhesive portion and the second adhesive portion are provided in a region overlapping the crotch stretchable member. The region where the first adhesive portion and the second adhesive portion are provided includes a region where the topsheet and the second sheet are not adhered and is easily deformable, a region overlapping the point where the first adhesive portion and the second adhesive portion intersect and the topsheet and the second sheet are firmly adhered, a region where only the first adhesive portion is disposed, and a region where only the second adhesive portion is disposed. While transmitting the expansion and contraction by the crotch stretchable member to the topsheet side (skin side) in the easily deformable region, it is possible to suppress the fluffing of the topsheet in the region that is difficult to deform.

[0017] According to a preferred embodiment, the invention according to aspect 8 may have the following features in the invention according to aspect 7. The first adhesive portion and the second adhesive portion are provided in a region overlapping the crotch stretchable member and a region extending outward in the front-rear direction from the crotch stretchable member. According to this embodiment, not only the region overlapping the crotch stretchable member but also the region extending outward in the front-rear direction from the crotch stretchable member are provided with the first adhesive portion and the second adhesive portion. Therefore, even when the region outside the front-rear direction of the crotch stretchable member rises due to the expansion and contraction of the crotch stretchable member, it is possible to suppress the fluffing of the topsheet in that region.

[0018] (2) Absorbent article according to the first embodiment Hereinafter, the absorbent article 1 according to the first embodiment will be described with reference to the drawings. In the description of the following drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the ratios of each dimension etc. are different from the actual ones. Therefore, specific dimensions etc. should be determined in consideration of the following description. Also, there may be portions where the dimensional relationships and ratios are different between the drawings. The absorbent article may be an absorbent article such as a sanitary napkin, a panty liner, an incontinence pad, or a fecal pad. The absorbent article may be an article that is attached and used inside a wearing article such as underwear. The absorbent article 1 of the embodiment is a sanitary napkin that is attached and used inside a wearing article.

[0019] FIG. 1 is a plan view seen from the skin side T1 of the absorbent article 1. FIG. 2 is a cross-sectional view taken along the line A-A shown in FIG. 1. The absorbent article 1 has a planar direction including a first direction D1 and a second direction D2 that are orthogonal to each other, and a thickness direction T that is orthogonal to the planar direction. The first direction D1 is one of the front-back direction L and the width direction W, and the second direction D2 is the other of the front-back direction L and the width direction W. In the present embodiment, the first direction D1 is the front-back direction L, and the second direction D2 is the width direction W. However, in a modified example, the first direction D1 may be the width direction W, and the second direction D2 may be the front-back direction L. [[ID=...]]

[0020] In the front-back direction L of the absorbent article 1, the side that abuts against the lower abdomen of the wearer is referred to as the "front side", and the side that abuts against the buttocks of the wearer is referred to as the "rear side". In the thickness direction T of the absorbent article 1, the side that abuts against the skin of the wearer is referred to as the "skin side", and the opposite side is referred to as the "non-skin side". The absorbent article 1 has a crotch region S3, a front region S1, and a rear region S2. The crotch region S3 is a region that is disposed to face the excretion opening of the wearer, for example, the vaginal opening. When the absorbent article 1 is worn on the wearing article, the crotch region S3 is disposed under the crotch of the wearing article and is a region disposed between the legs of the wearer. The front region S1 is located on the front side of the crotch region S3. The front edge of the front region S1 defines the front edge of the absorbent article 1. The rear region S2 is located behind the crotch region S3. The rear edge of the rear region S2 defines the rear edge of the absorbent article 1.

[0021] The absorbent article 1 comprises at least an absorbent core 30, a top sheet 10, and a back sheet 20, and has a vertically elongated shape. The top sheet 10 is made of any sheet-like material having fibers and a structure that allows liquid to pass through, such as a nonwoven fabric or woven fabric. The top sheet 10 is oriented in a planar direction and comes into contact with the wearer's skin. The absorbent article may have a side sheet 15 that covers the outer part of the top sheet 10. The side sheet 15 covers the skin-side T1 of the side of the top sheet 10 in the width direction and is positioned on the wing 7. The back sheet 20 is a liquid-impermeable sheet that covers the non-skin-side surface of the absorbent core. The back sheet 20 can be made of a breathable resin film, spunbond, or a sheet in which a breathable resin film is bonded to a nonwoven fabric such as spunlace.

[0022] The absorbent body 30 may include an absorbent core 31 made of laminated absorbent material and a core wrap sheet 32 ​​that covers at least the skin-facing side T1 of the absorbent core 31. The absorbent material constituting the absorbent core 31 can be formed from, for example, hydrophilic fibers, pulp, and superabsorbent polymers (SAP). The core wrap sheet 32 ​​can be made from, for example, nonwoven fabric or tissue sheet. The core wrap sheet 32 ​​may cover both the skin-facing side T1 and the non-skin-facing side T2 of the absorbent core 31. As a modification, the absorbent core 31 may not be covered by the core wrap sheet 32.

[0023] The absorbent article 1 has a second sheet 25 that abuts the non-skin side T2 of the top sheet 10. The second sheet 25 may be positioned between the top sheet 10 and the absorbent core 31. The second sheet 25 is a sheet for improving the draw-in of bodily fluids to the non-skin side and may be composed of a core wrap sheet 32 ​​or of a sheet separate from the core wrap sheet 32. In this embodiment, the second sheet 25 is composed of a core wrap sheet 32 ​​positioned closer to the skin than the absorbent core 31.

[0024] The absorbent article 1 may have wings 7. The wings 7 may be provided in the crotch area S3. The wings 7 extend outward in the width direction W from the absorbent core 31. The front edge of the wings 7 is defined by the base of the wings 7 and corresponds to the front portion of two recessed portions in the width direction W. The front edge of the wings 7 may define the boundary between the crotch area S3 and the front area S1. The rear edge of the wings 7 is defined by the base of the wings 7 and corresponds to the rear portion of two recessed portions in the width direction W. The rear edge of the wings 7 may define the boundary between the crotch area S3 and the rear area S2. In the case of an absorbent article 1 without wings 7, at the position where the length of the absorbent article 1 in the front-to-back direction L is longest, each of the regions obtained by dividing the absorbent article 1 into three equal parts in the front-to-back direction L may constitute the front area S1, the crotch area S3, and the rear area S2.

[0025] In this invention, the outer part refers to a portion occupying a certain range in the width direction W, including the outer edge in the width direction W, and the outer edge refers to the outer edge in the width direction W. In this invention, the inner part refers to a portion occupying a certain range in the width direction W, including the inner edge in the width direction W, and the inner edge refers to the inner edge in the width direction W. In this invention, the front end and rear end refer to a portion occupying a certain range in the front-rear direction L, including the edge in the front-rear direction L, and the front end edge and rear end edge refer to the edge in the front-rear direction L. The outer end includes the front end and rear end, and the outer end edge includes the front end edge and rear end edge. In addition, the inner edge includes the inner edge and extends along the front-rear direction L. The outer edge includes the outer edge and extends along the front-rear direction L. In this specification, the term "along the front-rear direction L" means a direction with an angle of less than 45° with respect to the front-rear direction L, and the term "along the width direction W" means a direction with an angle of less than 45° with respect to the width direction W.

[0026] The absorbent article 1 may have an adhesive portion for attaching it to the wearer's article. The adhesive portion is provided on the non-skin side T2 of the backsheet 20 and is an area where fastening means for attaching the absorbent article 1 to the wearer's article are provided. The adhesive portion may have at least one of a main adhesive portion 61 for attaching the area overlapping with the absorbent core 31 to the wearer's article, and a wing adhesive portion 62 for attaching the wing 7 to the wearer's article.

[0027] The absorbent article 1 of this embodiment is configured to suppress fuzzing of the fibers of the top sheet 10, leakage of bodily fluids, and stickiness of the top sheet 10. Next, the configuration for suppressing fuzzing of the fibers of the top sheet 10, leakage of bodily fluids, and stickiness of the top sheet 10 will be described in detail. The top sheet 10 and the second sheet 25 are bonded together by a first bonding portion 71 on which adhesive is placed, and a second bonding portion 72 on which an adhesive member is placed in a different shape from that of the first bonding portion 71. A well-known adhesive such as a hot melt adhesive can be used as the adhesive.

[0028] Figure 3 shows the first adhesive portion 71, as viewed from the non-skin side T2 of the top sheet 10. The first adhesive portion 71 extends at least in the first direction D1 and is arranged in multiples with spacing in the second direction D2. In this embodiment, the first adhesive portion 71 is arranged over the entire area of ​​the top sheet 10 in the front-to-back direction L and the entire area of ​​the top sheet 10 in the width direction W, and is not arranged in an area outside the top sheet 10 in the width direction W.

[0029] Figure 4 shows the second adhesive portion 72, as viewed from the non-skin side T2 of the top sheet 10 and the side sheet 15. The second adhesive portion 72 extends in the first direction D1 while swinging in the second direction D2, and multiple portions are arranged at intervals in the second direction D2. The second adhesive portion 72 has an amplitude of a certain length in the second direction D2. The first adhesive portion 71 of the embodiment is arranged over the entire area of ​​the top sheet 10 in the front-rear direction L. The second adhesive portion 72 of the embodiment is arranged over the entire area of ​​the top sheet 10 in the width direction W and on the side sheet 15 which extends outward from the top sheet 10 in the width direction W.

[0030] In the configuration where the adhesive portions (first adhesive portion 71 and second adhesive portion 72) are spaced apart in the second direction D2, it is sufficient that adjacent adhesive portions in the second direction D2 are spaced apart on any straight line extending D2, and both adjacent adhesive portions in the second direction may be located on the same straight line extending in the first direction. More specifically, for example, the left end of one adjacent first adhesive portion 71 in the second direction may be located to the left of the right end of the other first adhesive portion. The spacing of the adhesive portions in the second direction is the distance on any straight line extending D2 in the second direction, and Figure 6 shows the spacing G72 of the second adhesive portion 72 in the second direction D2.

[0031] Figure 5 shows both the first adhesive portion 71 and the second adhesive portion 72, and illustrates the first adhesive portion 71 and the second adhesive portion 72 attached to the non-skin side T2 of the top sheet 10 and the side sheet 15. Figure 6 is an enlarged view of portion B shown in Figure 5. The second adhesive portion 72 spans multiple first adhesive portions 71 that are spaced apart in the second direction D2. The second adhesive portion 72 has areas where adhesive is not applied that are spaced apart in both the first direction D1 and the second direction, but because the first adhesive portion 71 is placed in a part of the area where adhesive is not applied, the top sheet 10 becomes less likely to move relative to the second sheet 25, and the fluffing of the fibers of the top sheet 10 can be suppressed. The first adhesive portion 71 extends in the first direction D1 and is spaced apart in the second direction D2. Because the second adhesive portion 72 spans multiple first adhesive portions 71, even if the absorbent article 1 is subjected to force in the second direction D2 and deforms so that the gaps between the first adhesive portions 71 narrow, the second adhesive portion 72, which extends in the second direction D2 so as to span the first adhesive portions 71, can prevent the top sheet 10 from lifting. As a result, the gap between the top sheet 10 and the second sheet 25 is reduced, and a decrease in absorption speed and stickiness of the top sheet 10 can be suppressed. By providing both the first adhesive portions 71 and the second adhesive portions 72, fuzzing of the fibers of the top sheet 10, a decrease in absorption speed, and stickiness of the top sheet 10 can be suppressed.

[0032] In particular, in the configuration where the second direction D2 is the width direction W, the absorbent article 1 is susceptible to forces directed inward in the width direction W, and the lifting of the top sheet 10 when the gap between the first adhesive portions 71 narrows can be effectively suppressed. By suppressing the lifting of the top sheet 10, the gap between the top sheet 10 and the second sheet is reduced, and the transfer of bodily fluids from the top sheet to the second sheet is accelerated. Furthermore, in the configuration where the top sheet 10 has cellulose fibers (such as cotton), the top sheet tends to become sticky due to the presence of highly absorbent cellulose fibers, but by having the first adhesive portions 71 and the second adhesive portions 72 function hydrophobicly and suppressing the lifting of the top sheet, the decrease in absorption speed and the stickiness of the top sheet can be effectively suppressed.

[0033] The second adhesive portion 72 only needs to be positioned across two first adhesive portions 71 that are spaced apart in the second direction D2, and may also span across three or more first adhesive portions 71 that are spaced apart in the second direction D2. Figure 8 shows an absorbent article according to a modified example. Figure 8(A) shows a configuration in which the second adhesive portion 72 is positioned across three or more first adhesive portions 71 that are spaced apart in the second direction D2. As in this modified example, the more first adhesive portions 71 that the second adhesive portion 72 spans, the easier it is to suppress the lifting of the top sheet 10, and the more effectively the reduction in absorption speed and stickiness of the top sheet can be suppressed.

[0034] The first adhesive portion 71 may be linear in shape, extending along the first direction D1. Because the first adhesive portion 71 is linear in shape, intersections where the second adhesive portion 72 and the first adhesive portion 71 intersect can be provided at intervals in the first direction D1, thereby suppressing the movement of the top sheet 10 relative to the second sheet 25 and the lifting of the top sheet 10 throughout the entire first direction D1. In this embodiment, the first adhesive portion 71 extends linearly along the first direction D1, and the length 712 of each first adhesive portion 71 in the second direction D2 is the same as the spacing G71 of the first adhesive portions 71 in the second direction D2.

[0035] A linearly extending adhesive portion (for example, the first adhesive portion 71) may be provided by contact coating such as coater coating, and a curved adhesive portion (for example, the second adhesive portion 72) may be provided by non-contact coating. In a configuration in which adhesive is applied by both contact coating and non-contact coating, it is preferable to perform non-contact coating after contact coating. This prevents adhesive from adhering to the equipment used for subsequent coating processes.

[0036] The shape of the first adhesive portion 71 or the second adhesive portion 72 that swings in the second direction D2 while extending in the first direction D1 may be a shape in which wave shapes with amplitudes extending in the second direction are connected in the first direction, or a shape in which Ω shapes are connected in the first direction, or a shape in which spiral shapes are connected in the first direction.

[0037] The length 712 of the first adhesive portion 71 in the second direction D2 may be shorter than the length 722 of the second adhesive portion 72 in the second direction D2. Because the length of the second adhesive portion 72 that swings in the second direction D2 is long and the length of the linearly extending first adhesive portion 71 is short, the area of ​​the region to which the adhesive is applied can be suppressed and the ability to draw in bodily fluids can be improved. The length of the first adhesive portion 71 in the second direction D2 is the distance between the two ends of the first adhesive portion 71 in the second direction that extends in the first direction D1. Note that in the case of a linear form in which the first adhesive portion extends along the first direction D1, the width W71 of the first adhesive portion 71 in the orthogonal direction and the length 712 of the first adhesive portion 71 in the second direction D2 are the same. The length 722 of the second adhesive portion 72 in the second direction D2 is the distance between the two ends of the second adhesive portion 72 in the second direction D2 that extends in the first direction D1. In this embodiment, the length 712 of the first adhesive portion 71 in the second direction D2 is 1 mm, and the length 722 of the second adhesive portion 72 in the second direction D2 is 5 mm. The length 722 of the second adhesive portion 72 in the second direction D2 may be twice or more the length 712 of the first adhesive portion 71 in the second direction D2, and preferably three times or more.

[0038] The orthogonal width W71 of the first adhesive portion 71 may be wider than the orthogonal width W72 of the second adhesive portion 72. The orthogonal width of the adhesive is the width perpendicular to the direction in which the adhesive extends, and is the width of the coated adhesive line. Because the width W71 of the first adhesive portion 71 is wide, it is easier to secure the area of ​​the intersection where the first adhesive portion 71 and the second adhesive portion 72 intersect, suppressing the movement of the top sheet 10, suppressing fiber fuzzing, suppressing the lifting of the top sheet 10, and suppressing leakage of bodily fluids and stickiness of the top sheet 10. In this embodiment, the width W71 of the first adhesive portion 71 is 1 mm. Also, the area ratio of the first adhesive portion 71 may be higher than the area ratio of the second adhesive portion 72. The area ratio of the adhesive can be calculated by the area of ​​adhesive placed per unit area.

[0039] At least one of the orthogonal width W71 of the first adhesive portion 71 and the orthogonal width W72 of the second adhesive portion 72 may be thicker than the average fiber diameter of the top sheet 10. The fibers can be restrained by at least one of the first adhesive portion 71 and the second adhesive portion 72, making it easier to suppress fuzzing of the fibers of the top sheet 10. The average fiber diameter can be measured by a scanning electron microscope, and the average value of the fiber diameters measured for N=30 or more fibers can be used as the average fiber diameter. Note that when measuring in cross-section, care should be taken as the fiber shape may have changed during cutting. Also, when measuring in the planar direction, there may be welding, so measurement should be avoided in areas where the shape has changed, such as welded areas.

[0040] The thickness of the first adhesive portion 71 placed within the top sheet 10 may be greater than the thickness of the second adhesive portion 72 placed within the top sheet 10. By placing the first adhesive portion 71 and the second adhesive portion 72 within the top sheet 10, the fibers can be restrained by the adhesive within the thickness direction of the top sheet 10, and even if the fibers break within the top sheet 10, the fraying of the fibers can be suppressed. Furthermore, because the first adhesive portion 71 is thicker and the second adhesive portion 72 is thinner, the thicker first adhesive portion 71 suppresses fiber fraying, while ensuring the flow of bodily fluids within the top sheet 10 in the overlapping area with the thinner second adhesive portion 72. The thickness of the adhesive portions placed within the top sheet can be compared by viewing the cross-section of the top sheet with an electron microscope.

[0041] As shown in Figure 8(B), in the modified example, adjacent second adhesive portions 72 in the second direction D2 may be spaced apart in the second direction. The length 722 of the second adhesive portion 72 in the second direction D2 may be longer than the distance D72 between adjacent second adhesive portions. The distance D72 between adjacent second adhesive portions is the distance in the second direction between the outer edge of one second adhesive portion 72 in the second direction and the outer edge of the other second adhesive portion 72 in the second direction. According to this embodiment, the gap between the second adhesive portions can be reduced, and the lifting of the top sheet 10 can be further suppressed. In addition, since the second adhesive portion 72 extends in the first direction D1 while swinging in the second direction D2, unlike a linear shape, a region in the second direction D2 where no adhesive is placed is provided. Therefore, even if the length of the second adhesive portion 72 in the second direction D2 is increased, a region where no adhesive is placed can be secured.

[0042] The top sheet 10 and the back sheet 20 may be bonded together by a third adhesive portion 73. Figure 7 shows the third adhesive portion 73 as viewed from the skin side T1 of the back sheet 20. Multiple third adhesive portions 73 extend at least in the first direction D1 and are spaced apart in the second direction D2. The third adhesive portions 73 are distributed across the entire area of ​​the back sheet 20 in the front-to-back direction L. An absorbent core 31 is positioned between the back sheet 20 and the top sheet 10 and side sheets 15. In areas where the third adhesive portion 73 overlaps with the absorbent core 31, it bonds the back sheet 20 and the core wrap sheet 32 ​​located on the non-skin side of the absorbent core 31. In the region outside the absorbing core 31 in the planar direction (the region outside the absorbing core 31 in the front-rear direction, and the region outside the absorbing core in the width direction), the top sheet 10 and the back sheet 20 are bonded together by the first adhesive portion 71, the second adhesive portion 72, and the third adhesive portion 73. According to this embodiment, the edges of the top sheet 10 in the width direction W and the edges of the top sheet 10 in the front-rear direction L are firmly bonded together by the first adhesive portion 71, the second adhesive portion 72, and the third adhesive portion 73. Therefore, even when force is applied to the absorbent article from the outside in the width direction or the outside in the front-rear direction, the lifting of the top sheet can be suppressed, and the fuzzing of the top sheet can be further suppressed.

[0043] Next, the absorbent article 1X according to the second embodiment will be described with reference to Figures 9 and 10. Figure 9 is a front view of the absorbent article 1X according to the second embodiment, and Figure 10 is a cross-sectional view of the absorbent article 1X passing through the center in the front-rear direction and along the width direction W. In the description of the second embodiment, components similar to those of the first embodiment described above will be referred to with the same reference numerals and their description will be omitted. The absorbent article 1 according to the first embodiment is an absorbent article used attached to a wearable item, while the absorbent article 1X according to the second embodiment is a panty-type absorbent article having a waistband member. More specifically, the absorbent article 1X according to the second embodiment is a shorts-type sanitary napkin.

[0044] The absorbent article 1 comprises an absorbent body 2 having a top sheet 10, an absorbent core 31, and a back sheet 20, and a waist member 5 that covers the wearer's waist. The waist member 5 comprises a front waist member that covers the wearer's abdominal side and a rear waist member that covers the wearer's back side. The outer parts of the front waist member and the outer parts of the rear waist member are joined by a side joint 60 to form a pant shape. In the pant shape, there is a waist opening 101 into which the wearer's waist is inserted, and a pair of leg openings 102 into which the wearer's legs are inserted.

[0045] The absorbent article 1 has a second sheet 25, separate from the core wrap sheet 32, positioned between the top sheet 10 and the core wrap sheet 32. A first adhesive portion 71 and a second adhesive portion 72 are positioned between the top sheet 10 and the second sheet 25.

[0046] The absorbent article 1X has an elastic crotch member 27 that is located on the non-skin side T2 of the absorbent core 31 and stretches in the front-to-back direction. The elastic crotch member 27 may be made of elastic thread or an elastic sheet. In this embodiment, the elastic crotch member 27 is made of elastic thread arranged in an extended state in the front-to-back direction L, and multiple members are arranged at intervals in the width direction W. The elastic crotch member 27 only needs to be located on the non-skin side T2 of the absorbent core 31, and in this embodiment, it is located on the non-skin side T2 of the back sheet 20.

[0047] The first adhesive portion 71 and the second adhesive portion 72 are provided in the area overlapping with the crotch elastic member 27. The area where the first adhesive portion 71 and the second adhesive portion 72 are provided includes an area where the top sheet 10 and the second sheet 25 are not bonded and are easily deformed, an area where the top sheet 10 and the second sheet 25 are firmly bonded together at the intersection where the second adhesive portion 72 and the first adhesive portion 71 intersect, an area where only the first adhesive portion 71 is provided, and an area where only the second adhesive portion 72 is provided. In the easily deformable area, the stretching and contracting caused by the crotch elastic member 27 is transmitted to the top sheet 10 side (skin side), while in the less deformable area, fraying of the top sheet 10 can be suppressed.

[0048] The first adhesive portion 71 and the second adhesive portion 72 may be provided in a region that overlaps with the crotch elastic member 27 and in a region that extends outward in the front-to-back direction L from the crotch elastic member 27. Since the first adhesive portion 71 and the second adhesive portion 72 are provided not only in the region that overlaps with the crotch elastic member 27 but also in the region that extends outward in the front-to-back direction L from the crotch elastic member 27, it is possible to suppress fuzzing of the top sheet 10 in that region even when the region outside in the front-to-back direction L lifts up due to the stretching and contracting of the crotch elastic member 27.

[0049] In the second embodiment, the first adhesive portion 71 and the second adhesive portion 72 are arranged over the entire front-to-back L of the top sheet 10, and the crotch elastic member 27 is positioned in the center of the top sheet in the front-to-back direction and not at the front-to-back ends of the top sheet. The crotch elastic member 27 is positioned only in the area overlapping with the absorption core 31 and not in the area not overlapping with the absorption core 31.

[0050] Although the present invention has been described in detail using the embodiments described above, it will be clear to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the claims. Therefore, the description herein is for illustrative purposes only and is not intended to be restrictive in any way to the present invention. [Explanation of Symbols]

[0051] 1, 1X: Absorbent articles 10: Top sheet 20: Back seat 25: Second row seats 27: Inseam stretchable material 31: Absorption core 71: 1st adhesive part 72:Second adhesive part 73:Third adhesive part D1: 1st direction D2 :Second direction L: Front and back direction T: Thickness direction T1: Skin side T2: Non-skin side W: width direction

Claims

1. A top sheet that comes into contact with the wearer's skin, along a planar direction that includes a first direction and a second direction which are mutually orthogonal, A second sheet that contacts the non-skin side of the top sheet, An absorbent core positioned on the non-skin side of the second sheet, An absorbent article having a back sheet positioned on the non-skin side of the absorbent core, The top sheet and the second sheet are bonded together by a first bonding portion where adhesive is provided and a second bonding portion where adhesive is provided in a different shape from the first bonding portion. The first adhesive portion extends at least in the first direction and is arranged in multiples with intervals between them in the second direction. The second adhesive portion extends in the first direction while swinging in the second direction, and multiple portions are arranged at intervals in the second direction. The absorbent article wherein the second adhesive portion spans a plurality of the first adhesive portions arranged at intervals in the second direction.

2. The absorbent article according to claim 1, wherein the first adhesive portion is linear in shape and extends along the first direction.

3. The absorbent article according to claim 1 or claim 2, wherein the thickness of the first adhesive portion disposed within the top sheet is greater than the thickness of the second adhesive portion disposed within the top sheet.

4. The absorbent article according to claim 1 or claim 2, wherein at least one of the width of the first adhesive portion in a direction perpendicular to the direction in which the first adhesive portion extends, and the width of the second adhesive portion in a direction perpendicular to the direction in which the second adhesive portion extends, is thicker than the average fiber diameter of the top sheet.

5. The two adhesive portions that are adjacent in the two directions are spaced apart in the two directions. The absorbent article according to claim 1 or claim 2, wherein the length of the second adhesive portion in the second direction is longer than the distance between adjacent second adhesive portions.

6. In the region outside the planar direction of the absorbing core, the top sheet and the back sheet are bonded together by the first adhesive portion, the second adhesive portion, and the third adhesive portion, as described in claim 1 or 2.

7. The aforementioned absorbing core has an elastic crotch member positioned on the non-skin side that stretches in the front-to-back direction, The absorbent article according to claim 1 or claim 2, wherein the first adhesive portion and the second adhesive portion are provided in a region that overlaps with the crotch elastic member.

8. The absorbent article according to claim 7, wherein the first adhesive portion and the second adhesive portion are provided in a region that overlaps with the crotch elastic member and in a region that extends outward in the front-rear direction from the crotch elastic member.

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