absorbent materials
By designing alternating thick-walled and thin-walled sections on the top of the absorbent material and applying adhesive to the non-skin side to form a spiral or serpentine area, the problems of planar stability and urine absorption during installation of the absorbent material are solved, thereby improving operability and absorption efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- LIBAODE CO LTD
- Filing Date
- 2025-11-06
- Publication Date
- 2026-07-31
AI Technical Summary
Existing absorbent materials are difficult to keep flat during installation, have poor operability, and are not absorbent enough for urine.
The top plate design features alternating thick and thin wall sections along the width direction, with adhesive applied to the non-skin side to form a spiral or serpentine bonding area, enhancing planar rigidity and visual distinguishability. At the same time, it forms an uneven structure on the skin side to promote urine diffusion.
It improves the operability of absorbent materials and the efficiency of urine absorption, ensures planar stability and rapid diffusion of urine during use, and enhances the ability to absorb urine.
Smart Images
Figure CN122478710A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to absorbent articles such as incontinence pads (including light incontinence pads), sanitary napkins, and disposable diapers. Background Technology
[0002] Various top sheets for absorbent articles are known in the past. For example, Patent Document 1 discloses a nonwoven fabric having protrusions and recesses extending in the front-back direction, with the protrusions and recesses arranged alternately in the width direction; Patent Document 2 discloses an absorbent article having a nonwoven fabric with protrusions and recesses arranged alternately in the width direction as a top sheet.
[0003] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2010-285735 Patent Document 2: Japanese Patent Application Publication No. 2017-038838 Summary of the Invention The problem that the invention aims to solve When an absorbent article is installed in underwear or placed in the crotch area of the wearer, it is handled by grasping the front and back ends of the absorbent article. However, it is desirable for the absorbent article to remain as flat as possible to improve its operability. Furthermore, after being worn in the crotch area, it is desirable for the absorbent article to have excellent absorbency for bodily fluids such as urine. The present invention has been made in view of the above-mentioned circumstances, and its object is to provide an absorbent article that has excellent operability and excellent absorbency for bodily fluids such as urine.
[0004] Methods for solving problems The absorbent article of the present invention, which can solve the aforementioned problem, is described below.
[0005] [1] An absorbent article having a front-to-back direction and a width direction, and having a top sheet and a back sheet and an absorbent body disposed between the top sheet and the back sheet; The top plate has thick-walled portions and thin-walled portions extending along the front-rear direction, and a plurality of the thick-walled portions and a plurality of the thin-walled portions are alternately arranged along the width direction; On the skin-side surface of the top sheet, the thin-walled portion is recessed compared to the thick-walled portion; on the non-skin-side surface of the top sheet, the thin-walled portion is recessed compared to the thick-walled portion. The thick-walled portion and the thin-walled portion extend from the area overlapping with the absorber to the front of the front edge of the absorber and the rear of the rear edge of the absorber; The non-skin-facing side of the top sheet has: a first adhesive region coated with adhesive in a spiral or serpentine manner extending along the front-back direction; a second adhesive region fully coated with adhesive; the first adhesive region is disposed at least overlapping the absorbent, and the second adhesive region is disposed on the front and rear sides of the first adhesive region, and at least in front of the front edge of the absorbent and behind the rear edge of the absorbent.
[0006] [2] According to the absorbent article of [1], the second adhesive region is provided starting from the region that overlaps with at least one of the front end and the rear end of the absorbent.
[0007] [3] According to the absorbent article of [2], in the region where at least one of the front end and rear end of the absorbent overlaps with the second adhesive region, the length of the overlapping region in the front-rear direction is less than 20% of the length of the absorbent in the front-rear direction.
[0008] [4] The absorbent article according to any one of [1]-[3], wherein the second adhesive region has: a first region extending from at least the front edge of the absorbent to the front edge of the top sheet; and a second region extending from at least the rear edge of the absorbent to the rear edge of the top sheet.
[0009] [5] The absorbent article according to any one of [1]-[4], wherein the front edge and the rear edge of the absorbent are formed in a straight line.
[0010] [6] The absorbent article according to any one of [1]-[5], wherein the absorbent has a multilayer sheet member, wherein a water-absorbing resin is disposed between the sheet members but no pulp fibers are disposed; The absorbent has: a sealed portion where the sheet components are joined together; a non-sealed portion where the sheet components are not joined together; and a water-absorbing resin disposed in the non-sealed portion. The plurality of sealing portions and the plurality of non-sealing portions extend along the front-back direction and are alternately arranged in the width direction.
[0011] [7] The absorbent article according to any one of [1]-[6], wherein the top sheet is a nonwoven fabric, and in the thin-walled portion, the nonwoven fabric of the top sheet is heat-embossed.
[0012] [8] The absorbent article according to any one of [1]-[7], wherein the thick-walled portion and the thin-walled portion extend continuously from the front edge of the top sheet to the rear edge in the front-rear direction.
[0013] The effects of the invention In the absorbent article according to an embodiment of the present invention, the thick-walled portion and the thin-walled portion of the top sheet extend from the area overlapping with the absorbent body to the front of the front edge of the absorbent body and the rear of the rear edge of the absorbent body. A second adhesive area, fully coated with adhesive, is provided on the non-skin-facing side of the top sheet, at least in front of the front edge of the absorbent body and behind the rear edge of the absorbent body. Therefore, the rigidity of the absorbent article in the planar direction of the front and rear portions is increased, and the absorbent article is easily maintained in a planar shape when the user grasps the front and rear ends for operation, thus improving the operability of the absorbent article. Furthermore, in the absorbent article according to an embodiment of the present invention, since the unevenness of the top sheet caused by the thick-walled portion and the thin-walled portion is more clearly formed in the second adhesive area where adhesive is fully coated, the area where the absorbent body is present and the area where it is not can be easily distinguished visually when operating the absorbent article, making it easy to correctly place the absorbent article in a suitable position in the underwear or crotch area. On the other hand, in the first adhesive area on the non-skin side of the top sheet, the adhesive is applied in a spiral or serpentine manner extending in the front-back direction. Therefore, the top sheet easily forms folds extending in the width direction in the first adhesive area. As a result, in the first adhesive area, on the skin side of the top sheet, both the front-back and width directions of urine are ensured. Because the first adhesive area overlaps with the absorbent, urine excreted onto the skin side of the top sheet easily diffuses in both the front-back and width directions in the area overlapping with the absorbent, allowing for rapid and effective absorption of urine through the top sheet. Attached Figure Description
[0014] Figure 1 As an example of the absorbent article of the present invention, a top view of the incontinence pad is shown from the top sheet side.
[0015] Figure 2 express Figure 1 A cross-sectional view along the width of the top plate of the absorbent article shown.
[0016] Figure 3 express Figure 1 A cross-sectional view of the absorbent article at point III-III.
[0017] Figure 4 Schematic representation in Figure 1 A top view of the adhesive coating pattern on the non-skin-facing adhesive areas of the top sheet of the absorbent article shown.
[0018] Figure 5 express Figure 1 The example shown is an absorbent body of an absorbent article, and a cross-sectional view is shown in the width direction of the absorbent body.
[0019] Figure 6Indicates the view from the top side. Figure 5 A partial cross-sectional top view of the absorber shown.
[0020] Explanation of reference numerals in the attached figures 1: Absorbent material; 2: Top sheet; 21: Thick-walled portion; 22: Thin-walled portion; 23: Skin side; 24: Non-skin side; 25: First bonding area; 26: Second bonding area; 3: Back sheet; 4: Absorbent body; 41: Front edge; 42: Rear edge; 43: Sheet component; 44: Water-absorbing resin; 45: Adhesive layer; 46: Sealing portion; 47: Non-sealing portion; 5: Liner paper; 6: Stand-up flap; 7: Side sheet; 8: Elastic component for standing up. Detailed Implementation
[0021] The absorbent article of the present invention will be described with reference to the accompanying drawings. It should be noted that the present invention is not limited to the embodiments shown in the drawings. Figures 1-4 In this paper, an example of an absorbent article of the present invention is shown, which is a structural example of a light incontinence pad. Figure 1 This is a top view of an absorbent material (incontinence pad) viewed from the top side. Figure 2 express Figure 1 A cross-sectional view along the width of the top plate of the absorbent article shown. Figure 3 express Figure 1 The cross-sectional view of the absorbent article at point III-III shown. Figure 4 schematically representing from Figure 1 The illustrated absorbent article shows a top view of the adhesive coating pattern on the non-skin-facing adhesive areas of the top sheet after removing the side panels. It should be noted that the absorbent article of the present invention is not limited to the embodiment shown in the accompanying drawings.
[0022] The absorbent article 1 has a top sheet 2, a back sheet 3, and an absorbent body 4 disposed therebetween. The top sheet 2 is disposed on the skin side of the absorbent body 4, and the back sheet 3 is disposed on the non-skin side of the absorbent body 4. Excrement passing through the top sheet 2 is contained by the absorbent body 4. The back sheet 3 prevents excrement from leaking out. The absorbent article 1 is applicable, for example, to incontinence pads (including incontinence pads), sanitary napkins, disposable diapers, etc., and is particularly suitable for incontinence pads and sanitary napkins.
[0023] The absorbent article 1 has a front-to-back direction y and a width direction x. The front-to-back direction y represents the length direction of the absorbent article 1. The front-to-back direction y corresponds to the direction extending in the front-to-back direction between the wearer's crotch when the absorbent article 1 is worn. The width direction x represents the direction that is on the same plane as the absorbent article 1 and is orthogonal to the front-to-back direction y. The width direction x corresponds to the left-to-right direction of the wearer when wearing the absorbent article 1. Furthermore, the direction parallel to the plane formed by the front-to-back direction y and the width direction x is defined as the planar direction, and the direction perpendicular to this plane is defined as the thickness direction z. The absorbent article 1 defines a skin side and a non-skin side in the thickness direction z.
[0024] The top sheet 2 is positioned to face the wearer's skin when the absorbent article 1 is worn. The top sheet 2 is preferably liquid-permeable. For example, a nonwoven fabric made of hydrophilic fibers such as cellulose, synthetic fibers, or cotton yarn can be used as the top sheet 2; or a nonwoven fabric made of hydrophobic fibers such as polyolefins (e.g., polypropylene, polyethylene), polyesters (e.g., PET), or polyamides (e.g., nylon) can be used, wherein the surface of the hydrophobic fibers is hydrophilicized by a surfactant.
[0025] Preferably, the backing sheet 3 is liquid-impermeable. The backing sheet 3 can be a nonwoven fabric or a plastic film formed from hydrophobic fibers such as polyolefins (e.g., polypropylene, polyethylene), polyesters (e.g., PET), or polyamides (e.g., nylon). Alternatively, a laminate of nonwoven fabric and plastic film can also be used as the backing sheet 3.
[0026] Preferably, the top sheet 2 and the back sheet 3 are formed to be longer than the absorber 4 in the front-rear direction y. Specifically, preferably, the top sheet 2 and the back sheet 3 are configured to extend in front of the front edge 41 and behind the rear edge 42 of the absorber 4.
[0027] The absorbent article 1 may also have a backing paper 5 between the absorbent body 4 and the backing sheet 3. By providing the backing paper 5, the shape retention of the absorbent article 1 can be improved.
[0028] Preferably, the absorbent article 1 has stand-up flaps 6 on both sides in the width direction x of the skin side. The stand-up flaps 6 prevent side leakage of urine, etc. The stand-up flaps 6 can be formed, for example, by joining side panels 7 extending in the front-back direction y to both sides of the top panel 2 in the width direction x, and providing an elastic member 8 for standing up in the inner portion of the side panels 7 in the width direction x. By such arrangement of the side panels 7 and the elastic member 8, the contractile force of the elastic member 8 causes the inner portion of the side panels 7 in the width direction x to stand up towards the wearer's skin, thus forming the stand-up flaps 6. Preferably, the stand-up flaps 6 or side panels 7 are selected from: a liquid-impermeable plastic film, a liquid-impermeable nonwoven fabric, or a combination thereof.
[0029] The nonwoven fabric used for the sheets described above can be spunbond nonwoven fabric, dot-bonded nonwoven fabric, hot-air nonwoven fabric, meltblown nonwoven fabric, air-laid nonwoven fabric, spunlace nonwoven fabric, or SMS nonwoven fabric, etc. The preferred mass per unit area of these sheets is 8 g / m². 2 The above, more preferably 10g / m 2 The above; in addition, 40g / m 2 the following.
[0030] The absorbent body 4 is not particularly limited as long as it contains an absorbent material capable of absorbing urine and other excrement. For example, the absorbent body 4 can be a molded body formed by shaping the absorbent material into a predetermined shape, or it can be an absorbent body formed by covering the molded body with a covering sheet such as a paper sheet (e.g., thin paper or tissue paper) or a liquid-permeable nonwoven fabric sheet. Examples of absorbent materials include hydrophilic fibers such as pulp fibers, or absorbent resins such as polyacrylic acid, polyaspartic acid, cellulose, and starch / acrylonitrile. Furthermore, the absorbent material may also contain polyolefin fibers such as polyethylene and polypropylene, polyester fibers such as PET, or heat-melting fibers such as polyamide fibers. To improve its affinity with urine, these heat-melting fibers may also be hydrophilicated using surfactants or the like.
[0031] From the viewpoint of increasing the absorption rate of urine, etc., the absorbent material preferably contains hydrophilic fibers. Furthermore, from the viewpoint of increasing absorbency, the absorbent material preferably contains a water-absorbing resin. Therefore, as an example of absorbent body 4, it may also contain hydrophilic fibers (especially pulp fibers) and water-absorbing resin. In this case, it is preferable, for example, to use a material formed by mixing or dispersing water-absorbing resin within an aggregate of hydrophilic fibers. Absorbent body 4 may have multiple absorbent layers.
[0032] The absorbent 4 can be a sheet-like absorbent. Examples of sheet-like absorbents include those with absorbent resin between the sheet components but without pulp fibers. This type of sheet-like absorbent has absorbent resin between the sheet components, at least in the planar direction, thus enabling high absorbency. Furthermore, since the sheet-like absorbent does not have pulp fibers between the sheet components, it can be formed into a thin, non-bulky material.
[0033] The absorbent body 4 can have multiple sheet-like absorbent bodies. For example, the absorbent body 4 can have a first sheet-like absorbent body on the top sheet 2 side and a second sheet-like absorbent body on the back sheet 3 side. The number of absorbent layers contained in the absorbent body 4 can be appropriately determined according to the application; for example, it can also have more than three sheet-like absorbent bodies. In addition to being arranged in planar direction, this absorbent body 4 also has layers of absorbent resin in the thickness direction, thus providing an absorbent article with higher water absorption while maintaining a thin profile.
[0034] The shape (planar shape) of the absorber 4 is not particularly limited. The shape of the absorber 4 can be determined appropriately according to the application, for example, it can be roughly rectangular, hourglass-shaped, gourd-shaped, or shuttlecock-shaped. When the absorber 4 has multiple absorber layers, the shape (planar shape) and / or size of the absorber layers can be different from each other.
[0035] The top sheet 2 has thick-walled portions 21 and thin-walled portions 22 extending along the front-rear direction y, and the plurality of thick-walled portions 21 and the plurality of thin-walled portions 22 are alternately arranged along the width direction x. Figure 2 As shown, on the skin side 23 of the top plate 2, the thin-walled portion 22 is recessed compared to the thick-walled portion 21; on the non-skin side 24 of the top plate 2, the thin-walled portion 22 is recessed compared to the thick-walled portion 21.
[0036] The thick-walled portion 21 and the thin-walled portion 22 of the top sheet 2 extend from the area overlapping with the absorbent body 4 to the front of the front edge 41 of the absorbent body 4 and the rear of the rear edge 42 of the absorbent body 4. The non-skin-facing side 24 of the top sheet 2 has: a first adhesive region 25 coated with adhesive in a spiral or serpentine manner extending in the front-back direction y; and a second adhesive region 26 fully coated with adhesive. The first adhesive region 25 is at least provided in the area overlapping with the absorbent body 4, and the second adhesive region 26 is provided in front of and behind the first adhesive region 25, that is, at least in front of the front edge of the absorbent body 4 and behind the rear edge of the absorbent body 4. The area where the top sheet 2 overlaps with the absorbent body 4, and the area in front of the front edge of the absorbent body 4 and the area behind the rear edge of the absorbent body 4 that does not overlap with the absorbent body 4, are determined when viewed from the side of the absorbent article 1 facing the user's skin.
[0037] In the top sheet 2, the thick-walled portion 21 is formed to be thicker than the thin-walled portion 22. The thick-walled portion 21 is formed to bulge more than the thin-walled portion 22 on both the skin-side 23 and non-skin-side 24 of the top sheet 2; that is, on the skin-side 23, the thick-walled portion 21 bulges more towards the skin than the thin-walled portion 22, and on the non-skin-side 24, the thick-walled portion 21 bulges more towards the non-skin-side than the thin-walled portion 22. In the top sheet 2, the thick-walled portion 21 and the thin-walled portion 22 extend along the front-rear direction y, and multiple thick-walled portions 21 and multiple thin-walled portions 22 are alternately arranged along the width direction x. The thick-walled portion 21 and the thin-walled portion 22 are arranged as strips extending along the front-rear direction y. Therefore, the top sheet 2 is not easily bent in the front-rear direction y on either the skin-side or non-skin-side. In the top sheet 2, based on the formation of thick-walled portions 21 and thin-walled portions 22 arranged in strips extending in the front-rear direction y, the thick-walled portions 21 and thin-walled portions 22 extend from the area overlapping with the absorber 4 to the front of the front edge 41 of the absorber 4 and the rear of the rear edge 42 of the absorber 4.
[0038] An adhesive is applied to the non-skin side 24 of the top sheet 2, which bonds the top sheet 2 to the component in contact with its non-skin side. The non-skin side 24 of the top sheet 2 has a first adhesive region 25 and a second adhesive region 26. The first adhesive region 25 is at least overlapping the absorber 4, and the second adhesive region 26 is located on the front and rear sides of the first adhesive region 25, that is, at least in front of the front edge 41 of the absorber 4 and behind the rear edge 42 of the absorber 4. In the first adhesive region 25, the adhesive is applied in a spiral or serpentine manner extending in the front-rear direction y, and in the second adhesive region 26, the adhesive is applied completely.
[0039] As described above, in the absorbent article 1, the thick-walled portion 21 and the thin-walled portion 22 of the top sheet 2 extend from the area overlapping with the absorbent body 4 to the front and rear of the absorbent body 4, and the non-skin side 24 of the top sheet 2 is fully coated with adhesive in the second bonding area 26, which is disposed at least on the front and rear sides of the absorbent body 4. This increases the rigidity of the absorbent article 1 in the planar direction of the front and rear portions. Therefore, when a user grasps the front and rear ends of the absorbent article 1 for operation, the absorbent article 1 is easily maintained in a flat shape, and the operability of the absorbent article 1 is improved when it is installed in underwear or placed in the crotch area of the wearer. Furthermore, in the absorbent article 1, by fully coating the top sheet 2 with adhesive in the second bonding area 26 on the front and rear sides of the absorbent body 4, the unevenness of the top sheet 2 caused by the thick-walled portion 21 and the thin-walled portion 22 is more clearly formed in the second bonding area 26. Therefore, when handling the absorbent article 1, the area where the absorbent body 4 is present and the area where it is not present can be easily distinguished by visual inspection, and the absorbent article 1 can be easily and correctly placed in the appropriate position in the underwear or crotch area.
[0040] On the other hand, as described above, in the top sheet 2 having thick-walled portions 21 and thin-walled portions 22 arranged in a strip shape extending in the front-rear direction y, the diffusion of urine and the like in the front-rear direction y is increased on the skin side 23 of the top sheet 2, but the diffusion in the width direction x tends to decrease. In particular, in the second bonding region 26, the strip-shaped unevenness extending in the front-rear direction y is more clearly formed by the thick-walled portions 21 and thin-walled portions 22. In contrast, in the first bonding region 25, since the adhesive is applied in a spiral or serpentine manner extending in the front-rear direction y, the top sheet 2 is intermittently bonded in the front-rear direction y in the first bonding region 25. Therefore, wrinkles extending in the width direction x are easily generated in the top sheet 2 in the first bonding region 25. Furthermore, in the skin-side surface 23 of the top sheet 2, a thin-walled portion 22 is recessed, forming a groove extending in the front-rear direction y. However, in the first adhesive region 25, the shallow and deep portions of the groove alternate in the front-rear direction y. As a result, in the first adhesive region 25, on the skin-side surface 23 of the top sheet 2, diffusion of urine in the front-rear direction y is ensured, as well as diffusion in the width direction x. In particular, since the first adhesive region 25 overlaps with the absorbent 4, urine excreted onto the skin-side surface 23 of the top sheet 2 easily diffuses in both the front-rear direction y and the width direction x in the area overlapping with the absorbent 4, allowing the urine to be quickly and effectively absorbed through the top sheet 2. In addition, in the first adhesive region 25 of the top sheet 2, the strip-shaped unevenness extending in the front-rear direction y through the thick-walled portion 21 and the thin-walled portion 22 is not very noticeable, giving an impression of softness to the touch.
[0041] like Figure 4 As shown, in the first bonding region 25, the adhesive portion coated with a spiral or serpentine pattern is formed as a whole extending in the front-back direction y. That is, the extension direction of the repeating spiral or serpentine curve pattern is approximately the same as the front-back direction y. The adhesive portion refers to the part that is actually coated with adhesive, and in the first bonding region 25, the adhesive portion is formed to extend in a spiral or serpentine manner in the front-back direction y. The first bonding region 25 is defined as the region surrounding the adhesive portion coated with a spiral or serpentine pattern.
[0042] Spiral adhesive portions can be formed, for example, by applying adhesive using a spiral coating method, while serpentine adhesive portions can be formed, for example, by applying adhesive using an omega coating method. Serpentine shapes include, for example, repeating patterns in the form of sine waves or Ω shapes. The amplitude of the spiral or serpentine patterned adhesive portion is preferably 5 mm or more, more preferably 10 mm or more; furthermore, it is preferably 25 mm or less, more preferably 20 mm or less.
[0043] Preferably, the adhesive portions extending in a serpentine or spiral shape in the front-to-back direction y are arranged in multiple rows in the width direction x to form the first adhesive region 25. In this case, among the adhesive portions arranged in multiple rows in the width direction x, adjacent adhesive portions can be arranged to partially overlap each other, or adjacent adhesive portions can be arranged separately in the width direction x. It should be noted that if arranged in the latter manner, urine and the like can easily pass through the top sheet 2 and be rapidly absorbed by the absorbent body 4, which is preferable. In the first adhesive region 25, the distance between the multiple rows of adhesive portions arranged in the width direction x and adjacent adhesive portions is preferably 10 mm or less, more preferably 8 mm or less, and even more preferably 5 mm or less; furthermore, it is preferably 1 mm or more, and more preferably 2 mm or more.
[0044] In the second bonding region 26, the adhesive is completely coated, meaning that an adhesive portion is formed on the entire surface of the second bonding region 26. In the second bonding region 26, as long as the adhesive portion forms on the entire surface of the region, the method of applying the adhesive is not particularly limited. For example, the adhesive can be applied in a planar manner, or it can be applied in a linear manner without gaps, thereby achieving complete adhesive coating. Furthermore, a linear adhesive can be applied overlying a planar adhesive coating. In either case, if the adhesive is completely coated, this region becomes the second bonding region 26.
[0045] In the first bonding area 25 and the second bonding area 26, the top sheet 2 and the component in contact with its non-skin side are bonded. In the portion where the top sheet 2 overlaps with the absorbent body 4, the top sheet 2 can be bonded to the absorbent body 4, or a second sheet can be disposed between the top sheet 2 and the absorbent body 4, and the top sheet 2 is bonded to the second sheet. In the portion where the top sheet 2 does not overlap with the absorbent body 4, the top sheet 2 can be bonded to the back sheet 3, or a liner 5 can be disposed between the back sheet 3 and the absorbent body 4, and the top sheet 2 is bonded to the liner 5. It should be noted that in the portion where the top sheet 2 overlaps with the absorbent body 4, preferably, the top sheet 2 is directly bonded to the absorbent body 4, and preferably, no other component is disposed between the top sheet 2 and the absorbent body 4. As a result, the top sheet 2 is prone to produce wrinkles extending in the width direction x in the first bonding area 25. It should be noted that, as described later, in at least the front edge and the rear edge of the absorbent article 1, from the viewpoint of preventing leakage in the forward and backward directions, it is preferable that the top sheet 2 and the back sheet 3 are directly bonded.
[0046] The thick-walled portion 21 and the thin-walled portion 22 of the top sheet 2 will be described in detail. The top sheet 2 is preferably a nonwoven fabric. Preferably, the thick-walled portion 21 and the thin-walled portion 22 are formed by embossing the nonwoven fabric to thin the embossed portion. That is, in the top sheet 2, the thin-walled portion 22 is preferably an embossed portion. This ensures the rigidity of the top sheet 2 at the thin-walled portion 22, making it less prone to bending in the front-to-back direction (y) and also less prone to bending in the width direction (x) at the thin-walled portion 22, thus improving the rigidity of the top sheet 2 in the planar direction. The embossed portion of the thin-walled portion 22 can be a heat-embossed portion, i.e., a portion embossed while being heated, or a non-heat-embossed portion, i.e., a portion embossed without heating, but the former is more preferred. That is, more preferably, the nonwoven fabric of the top sheet 2 at the thin-walled portion 22 is heat-embossed. This makes it easier to ensure the rigidity of the thin-walled portion 22 of the top sheet 2.
[0047] To create a thin-walled portion 22 that is more recessed than the thick-walled portion 21 on both the skin-side 23 and non-skin-side 24 of the top sheet 2, as an example, an embossing roller and a flat roller are prepared, alternatingly arranged axially with raised strips and grooves extending circumferentially on the circumferential surface. Non-woven fabric is then held between the embossing roller and the flat roller to perform embossing. As another example, two embossing rollers, alternatingly arranged axially with raised strips and grooves extending circumferentially on the circumferential surface, are prepared, with the raised strips facing each other, and non-woven fabric is held between the two rollers to perform embossing. If the thin-walled portion 22 is a heat-embossed portion, one or both of the rollers can be heated. In the above example, it is preferable to heat both rollers before use.
[0048] The thickness T1 of the thick-walled portion 21 of the top sheet 2 is preferably 0.3 mm or more, and more preferably 0.4 mm or more. This ensures the thickness of the top sheet 2 and improves the rigidity of the top sheet 2 in the forward and backward direction y. On the other hand, the thickness T1 of the thick-walled portion 21 of the top sheet 2 is preferably 1.8 mm or less, and more preferably 1.5 mm or less. This prevents the thickness of the top sheet 2 from becoming too thick, and makes it easier to ensure the liquid permeability of the top sheet 2.
[0049] The spacing between the plurality of thick-walled portions 21 arranged in the width direction x is preferably 1 mm or more, more preferably 2 mm or more, and even more preferably less than 5 mm. The spacing between the thick-walled portions 21 refers to the distance between the thickest part of one thick-walled portion 21 and the thickest part of an adjacent thick-walled portion 21 in the width direction x. Thus, by using the thick-walled portions 21 and the thin-walled portions 22, it is easy to improve the rigidity of the top sheet 2 in the forward and backward direction y. The spacing between the plurality of thin-walled portions 22 arranged in the width direction x is also the same as the spacing between the thick-walled portions 21 described above.
[0050] In the top sheet 2, preferably, the thickness T1 of the thick-walled portion 21 is 3 times or more but less than 15 times the thickness T2 of the thin-walled portion 22. By making the thickness T1 of the thick-walled portion 21 more than 3 times the thickness T2 of the thin-walled portion 22, the difference between the thickness T1 of the thick-walled portion 21 and the thickness T2 of the thin-walled portion 22 becomes larger, making the top sheet 2 less prone to bending in the front-rear direction y, thus improving the rigidity of the top sheet 2 in the front-rear direction y. By making the thickness T1 of the thick-walled portion 21 less than 15 times the thickness T2 of the thin-walled portion 22, the thickness of the thin-walled portion 22 is ensured, making the top sheet 2 less prone to bending in the width direction x, thus improving the rigidity of the top sheet 2 in the width direction x. The thickness T1 of the thick-walled portion 21 is preferably less than 12 times the thickness T2 of the thin-walled portion 22, more preferably less than 10 times.
[0051] The thickness T1 of the thick-walled portion 21 and the thickness T2 of the thin-walled portion 22 of the top sheet 2 can be determined by peeling the top sheet 2 from the absorbent article 1 and cutting it along the width direction x, and measuring the thickness T1 of the thick-walled portion 21 and the thickness T2 of the thin-walled portion 22 at the cut surface. The thickness T1 of the thick-walled portion 21 is determined by measuring the thickness of the thickest part of the thick-walled portion 21 located between adjacent thin-walled portions 22 in the width direction x, and the thickness T2 of the thin-walled portion 22 is determined by measuring the thickness of the thinnest part of the thin-walled portion 22 located between adjacent thick-walled portions 21 in the width direction x. The top sheet 2 is cut along the width direction x at three locations: within 1 cm in front of the front edge 41 of the absorber 4, within 1 cm behind the rear edge 42 of the absorber 4, and at the center of the front-rear direction y that overlaps with the absorber 4. The thicknesses of the 5 or 6 thick-walled portions 21 and thin-walled portions 22 at the center of the width direction x are measured respectively, and their average values are calculated as the thickness T1 of the thick-walled portion 21 and the thickness T2 of the thin-walled portion 22. The thicknesses of the thick-walled portion 21 and the thin-walled portion 22 can be easily measured based on the image of the cut surface of the top sheet 2.
[0052] In the top sheet 2, the thick-walled portion 21 and the thin-walled portion 22 are preferably disposed over a wider area in front of the front edge 41 of the absorber 4, and more preferably over a wider area in rear of the rear edge 42 of the absorber 4. In the portion of the top sheet 2 located in front of the front edge 41 of the absorber 4, the length (maximum length) of the strip-shaped thick-walled portion 21 and thin-walled portion 22 in the front-rear direction y is preferably 50% or more, more preferably 70% or more, and even more preferably 80% or more. Particularly preferably, the strip-shaped thick-walled portion 21 and thin-walled portion 22 extend integrally along the front-rear direction y in the portion of the top sheet 2 located in front of the front edge 41 of the absorber 4. In the portion of the top sheet 2 located behind the rear edge 42 of the absorber 4, the length of the strip-shaped thick-walled portion 21 and thin-walled portion 22 in the front-rear direction y is preferably 50% or more, more preferably 70% or more, and even more preferably 80% or more. Particularly preferably, the strip-shaped thick-walled portion 21 and thin-walled portion 22 extend integrally in the front-rear direction y in the portion of the top sheet 2 located behind the rear edge 42 of the absorber 4. Particularly preferably, the strip-shaped thick-walled portion 21 and thin-walled portion 22 extend in the front-rear direction y and are alternately arranged in the width direction x in the portion of the top sheet 2 located behind the rear edge 42 of the absorber 4.
[0053] In the top sheet 2, preferably, the thick-walled portion 21 and the thin-walled portion 22, configured as strips, are provided over a relatively wide range of the portion overlapping with the absorber 4. In the portion of the top sheet 2 overlapping with the absorber 4, the length (maximum length) of the strip-shaped thick-walled portion 21 and thin-walled portion 22 in the front-rear direction y is preferably 20% or more, more preferably 40% or more, further preferably 60% or more, and even more preferably 80% or more. Particularly preferably, the thick-walled portion 21 and the thin-walled portion 22 extend continuously from the front edge 41 of the absorber 4 along the front-rear direction y to the rear edge 42.
[0054] Preferably, the thick-walled portion 21 and the thin-walled portion 22 extend continuously from the front edge of the top sheet 2 along the front-rear direction y to the rear edge. This easily ensures the rigidity of the absorbent article 1 in the planar direction throughout the front-rear direction y, improving operability when grasping the front and rear ends of the absorbent article 1.
[0055] The length of the overall width direction x of the plurality of thick-walled portions 21 and thin-walled portions 22 arranged in strips is preferably 80% or more, more preferably 90% or more, and may also be longer than the length of the width direction x of the absorbent body 4. Furthermore, the length of the overall width direction x of the plurality of thick-walled portions 21 and thin-walled portions 22 arranged in strips is preferably 80% or more, more preferably 90% or more, of the length of the width direction x of the top sheet 2. If the absorbent article 1 is formed in this way, it is easy to ensure planar rigidity over a wide range of width direction x of the absorbent article 1.
[0056] The preferred mass per unit area of the top sheet 2 is 20 g / m². 2 Above and 35g / m 2 The following applies. If the top sheet 2 is formed in this manner, it is easy to ensure the rigidity of the top sheet 2 in the planar direction, and it is also easy to ensure the liquid permeability of the top sheet 2. More preferably, the mass per unit area of the top sheet 2 is 22 g / m². 2 The above is further preferred to be 25g / m 2 The above; furthermore, 32g / m 2 The following is a further preferred value: 30g / m 2 the following.
[0057] The first adhesive region 25 and the second adhesive region 26 of the top sheet 2 will be described in detail. In the non-skin side 24 of the top sheet 2, the first adhesive region 25 is provided at least overlapping with the absorbent 4, and may also be provided in a region that does not overlap with the absorbent 4. Preferably, the first adhesive region 25 is provided over a wider range in the portion overlapping with the absorbent 4. In the portion overlapping with the absorbent 4, the length of the first adhesive region 25 in the front-rear direction y is preferably 60% or more, more preferably 70% or more, and even more preferably 80% or more.
[0058] In the non-skin side 24 of the top sheet 2, the second adhesive region 26 may be provided at least in a region that does not overlap with the absorbent 4, and may also be provided in a region that overlaps with the absorbent 4. In the non-skin side 24 of the top sheet 2, the second adhesive region 26 is preferably provided in a wider range extending to the front portion of the front edge 41 of the absorbent 4, and is also preferably provided in a wider range extending to the rear portion of the rear edge 42 of the absorbent 4.
[0059] In one embodiment of the present invention, preferably, in the non-skin side 24 of the top sheet 2, the second adhesive region 26 has a first region and a second region, wherein the first region extends at least to the front edge of the top sheet 2 in front of the front edge 41 of the absorbent 4, and the second region extends to the rear edge of the top sheet 2 behind the rear edge 42 of the absorbent 4. If the second adhesive region 26 is further provided starting from a region that overlaps with at least one of the front end and rear end of the absorbent 4, the front end and / or rear end of the absorbent 4 are joined in the planar direction between the top sheet 2 and the back sheet 3, thus making it more difficult to leak to the front of the front edge 41 and / or the rear edge 42 of the absorbent 4. In the front-rear direction y of the absorbent article 1, a first adhesive region 25 is provided between the first region and the second region of the second adhesive region 26. Preferably, the first adhesive region 25 is arranged to overlap more than 80% with the absorbent 4 in a top view.
[0060] In the portion of the top sheet 2 located in front of the front edge 41 of the absorber 4, the length of the second adhesive region 26 in the front-rear direction y is preferably 50% or more, more preferably 70% or more, further preferably 80% or more, and particularly preferably 100% of the length of the portion in the front-rear direction y. That is, particularly preferably, the second adhesive region 25 extends all the way to the front edge of the top sheet 2. Since the front edge of the top sheet 2 is directly bonded and fixed to the front edge of the back sheet 3, leakage in the forward direction can be expected to be prevented.
[0061] In the portion of the top sheet 2 located behind the rear edge 42 of the absorber 4, the length of the second adhesive region 26 in the front-rear direction y is preferably 50% or more, more preferably 70% or more, further preferably 80% or more, and particularly preferably 100% of the length of the portion in the front-rear direction y. That is, particularly preferably, the second adhesive region 25 extends all the way to the rear edge of the top sheet 2. Since the rear edge of the top sheet 2 is directly bonded and fixed to the rear edge of the back sheet 3, leakage in the rearward direction can be expected to be prevented.
[0062] Preferably, the second adhesive region 26 is positioned from an area overlapping with the absorbent body 4 in a top view to an area not overlapping with the absorbent body 4. Specifically, preferably, the second adhesive region 26 is positioned from an area overlapping at least one of the front and rear ends of the absorbent body 4 to an area not overlapping with the absorbent body 4. Thus, in the absorbent article 1, the planar rigidity from the area overlapping at least one of the front and rear ends of the absorbent body 4 to the area not overlapping with the absorbent body 4 is increased. As a result, when a user grasps the front and rear ends of the absorbent article 1 for operation, the absorbent article 1 is less prone to bending at the front edge 41 and rear edge 42 of the absorbent body 4, improving the operability of the absorbent article 1. More preferably, in the absorbent article 1, in both the front and rear ends of the absorbent body 4, the second adhesive region 26 is positioned from an area overlapping with the absorbent body 4 to an area not overlapping with the absorbent body 4.
[0063] When the second adhesive region 26 is provided as described above, preferably, in the region where at least one of the front end and rear end of the absorbent 4 overlaps with the second adhesive region 26, the length of the overlapping region of the second adhesive region 26 in the front-rear direction y is less than 20% of the length of the absorbent 4 in the front-rear direction y. In the second adhesive region 26 of the top sheet 2, the diffusion of urine in the width direction x is easily reduced. In the region overlapping with the absorbent 4, if the length of the second adhesive region 26 in the front-rear direction y is less than 20% of the length of the absorbent 4, then in the region of the top sheet 2 overlapping with the absorbent 4, the diffusion of urine in the width direction x of the skin side 23 of the top sheet 2 can be ensured, and urine can easily and quickly pass through the top sheet 2 and be well absorbed by the absorbent 4. In the second adhesive region 26, the length of the front-rear direction y of the region overlapping with the front end of the absorbent 4 can be less than 20% of the length of the front-rear direction y of the absorbent 4, and the length of the front-rear direction y of the region overlapping with the rear end of the absorbent 4 can be less than 20% of the length of the front-rear direction y of the absorbent 4. The total length of the front-rear direction y of the regions overlapping with the front and rear ends of the absorbent 4 can be less than 20% of the length of the front-rear direction y of the absorbent 4. Preferably, in the region overlapping with the absorbent 4, the length of the front-rear direction y of the second adhesive region 26 is less than 20% of the length of the front-rear direction y of the absorbent 4. That is, preferably, the total length of the front-rear direction y of the second adhesive region 26 provided in the region overlapping with the absorbent 4 is less than 20% of the length of the front-rear direction y of the absorbent 4. Furthermore, more preferably, the length of the front-rear direction y of the second adhesive region 26 in the region overlapping with the front half of the absorbent 4 and the length of the front-rear direction y of the second adhesive region 26 in the region overlapping with the rear half of the absorbent 4 are both less than 10% of the length of the front-rear direction y of the absorbent 4.
[0064] The second adhesive region 26 can be located on the front and rear sides of the first adhesive region 25. It can be separated from the first adhesive region 25 in the front-rear direction y, or it can be connected to the first adhesive region 25 in the front-rear direction y. It should be noted that the second adhesive region 26 is preferably connected to the first adhesive region 25 in the front-rear direction y, and the non-skin side 24 of the top sheet 2 preferably does not form a non-adhesive region between the first adhesive region 25 and the second adhesive region 26. If a non-adhesive region is formed between the first adhesive region 25 and the second adhesive region 26, a large wrinkle extending in the width direction x is easily formed in the top sheet 2 in this non-adhesive region, which easily hinders the diffusion of urine, etc., in the front-rear direction y. However, by setting the second adhesive region 26 to be connected to the first adhesive region 25 in the front-rear direction y, the diffusion of urine, etc., in the front-rear direction y is easily ensured on the skin side 23 of the top sheet 2.
[0065] The length of the first adhesive region 25 in the width direction x and the length of the second adhesive region 26 in the width direction x are not particularly limited, but preferably, the length of the second adhesive region 26 in the width direction x is longer than the length of the first adhesive region 25 in the width direction x. This makes it easier for the user to grasp the front and rear ends of the absorbent article 1 for operation. That is, because the rigidity of the absorbent article 1 in the planar direction is increased in the second adhesive region 26 on the front and rear sides of the absorbent body 4, it is easier for the user to grasp the front and rear ends of the absorbent article 1; furthermore, when grasping the front and rear ends of the absorbent article 1, it is easier to maintain the absorbent article 1 in a planar shape. Therefore, by making the second adhesive region 26 wider in the width direction x, the operability of the user when grasping the front and rear ends of the absorbent article 1 is improved.
[0066] The length of the first adhesive region 25 in the width direction x is preferably 50% or more of the length of the top sheet 2 in the width direction x, more preferably 60% or more. Furthermore, the length of the first adhesive region 25 in the width direction x is preferably 30% or more of the length of the absorbent body 4 in the width direction x, more preferably 35% or more, and even more preferably 70% or more. To maintain the shape of the absorbent article 1, the length of the first adhesive region 25 in the width direction x can be configured up to 110% of the length of the absorbent body 4 in the width direction x.
[0067] The length of the second adhesive region 26 in the width direction x is preferably 70% or more, more preferably 80% or more, of the length of the top sheet 2 in the width direction x. Furthermore, the length of the second adhesive region 26 in the width direction x is preferably 40% or more, more preferably 45% or more, of the length of the absorbent 4 in the width direction x.
[0068] As described above, from the viewpoint of further maximizing the effect of forming thick-walled portions 21 and thin-walled portions 22 in the top sheet 2 and providing second adhesive regions 26 fully coated with adhesive on the front and rear sides of the absorbent body 4, in the absorbent article 1, preferably, at least one of the front edge 41 and the rear edge 42 of the absorbent body 4 is formed as a straight line; more preferably, both the front edge 41 and the rear edge 42 of the absorbent body 4 are formed as straight lines in the width direction x. If the front edge 41 and the rear edge 42 of the absorbent body 4 are formed as straight lines, the absorbent article 1 is easily bent at that location. In the absorbent article 1, since the top sheet 2 is formed as described above, it is easier to achieve the effect that the absorbent article 1 is not easily bent at the front edge 41 and the rear edge 42 of the absorbent body 4. In this case, preferably, the front edge 41 and the rear edge 42 of the absorbent body 4 are formed as straight lines extending in the width direction x. As such an absorbent body 4, a rectangular shape absorbent body 4 can be cited as an example.
[0069] The length of the front portion of the front edge 41 of the top sheet 2 and the absorbent body 4 in the front-rear direction y is preferably 2 cm or more and 7 cm or less, and the length of the rear portion of the rear edge 42 of the top sheet 2 and the absorbent body 4 in the front-rear direction y is preferably 2 cm or more and 7 cm or less. If the absorbent article 1 is formed in this way, it further benefits from having a thick-walled portion 21 and a thin-walled portion 22 arranged in a strip along the front-rear direction y in the top sheet 2, and providing a second adhesive area 26 fully coated with adhesive on the front and rear sides of the absorbent body 4. That is, the rigidity of the absorbent article 1 in the planar direction is improved in the front and rear portions, and the absorbent article 1 is easily maintained in a planar shape when the user grasps the front and rear ends of the absorbent article 1 for operation. The length of the front portion of the front edge 41 of the top sheet 2 and the rear portion of the rear edge 42 of the absorbent body 4 in the front-rear direction y is more preferably 2.5 cm or more, and even more preferably 6 cm or less.
[0070] The top sheet 2 formed as described above, especially when the absorber 4 is a sheet-like absorber, is particularly effective in cases such as... Figure 5 as well as Figure 6 As shown, the absorbent 4 has multiple sheet members 43, with absorbent resin 44 disposed between the sheet members 43 and no pulp fibers disposed therebetween. The sealing portions 46 where the sheet members 43 interlock and the non-sealing portions 47 where the sheet members 43 do not interlock are arranged in a strip extending in the front-rear direction y. It is particularly preferable when the non-sealing portions 47 are provided with absorbent resin 44. Figure 5 In the diagram, a cross-sectional view is shown in the width direction x of the absorber 4, which is a sheet-like absorber; in Figure 6 The image shows a partial cross-sectional top view of the absorber 4, which is a sheet-like absorber, as seen from the top plate 2 side.
[0071] The absorbent 4, constructed as described above, exhibits excellent diffusion of urine and the like in the forward-backward direction (y), but its diffusion in the width direction (x) tends to decrease. However, in the top sheet 2, a first adhesive region 25 is formed in the area overlapping with the absorbent 4. Within this first adhesive region 25, both the forward-backward (y) and width direction (x) diffusion of urine and the like are ensured on the skin-side surface 23 of the top sheet 2. Therefore, the decrease in the width direction (x) diffusion of the absorbent 4 can be compensated for. Consequently, the absorption performance of the absorbent 4 for urine and the like can be improved.
[0072] Furthermore, in the absorbent body 4 constructed as described above, the absorbent resin 44 may overflow from the front and rear ends of the absorbent body 4. However, this possibility is eliminated by the second adhesive region 26 on the non-skin side 24 of the top sheet 2. That is, in the non-skin side 24 of the top sheet 2, since a fully adhesive region, namely the second adhesive region 26, which is fully coated with adhesive is provided at least in the front portion of the front edge 41 of the absorbent body 4 and at least in the rear portion of the rear edge 42 of the absorbent body 4, it is possible to prevent the absorbent resin 44 from overflowing from the front and rear ends of the absorbent body 4. Preferably, the second adhesive region 26 is repeatedly provided in the front-rear direction y at a distance of 2-20 mm inward from the front edge 41 and / or the rear edge 42 of the absorbent body 4. For example, when a multi-layer sheet absorbent is configured as absorbent 4, the second adhesive region 26 repeats in the front-rear direction y at least 5 mm inside the front edge 41 and / or rear edge 42 of absorbent 4. Even when the absorbent resin swells when the absorbent article 1 is used, leakage in the front and / or rear directions can be prevented because the movement of the absorbent resin in the front and / or rear directions is suppressed by the second adhesive region 26.
[0073] right Figure 5 as well as Figure 6 The structure of the absorbent shown will be described in detail. The absorbent 4 has multiple sheet members 43, with absorbent resin 44 disposed between the sheet members 43, but no pulp fibers are disposed therebetween. That is, the absorbent 4 has sheet members 43 disposed on both the skin side and the non-skin side, and although absorbent resin 44 is disposed between these sheet members 43, no pulp fibers are disposed between these sheet members 43. It should be noted that pulp fibers that are unavoidably mixed in during manufacturing are permissible between the sheet members 43. With the above-described structure, the absorbent 4 can be formed into a thin form while having a high absorbency capacity.
[0074] The shape (planar shape) of the absorber 4 is not particularly limited. Examples of possible shapes for the absorber 4 include: approximately rectangular, hourglass-shaped, gourd-shaped, or shuttlecock-shaped.
[0075] As the absorbent resin 44, the following can be used: polyacrylic acid-based absorbent resins such as sodium polyacrylate; starch-based absorbent resins such as starch-acrylonitrile graft copolymers, starch-acrylic acid graft copolymers, or starch-acrylamide graft copolymers; and polyvinyl alcohol-based absorbent resins such as cross-linked polyvinyl alcohol. In terms of high liquid absorption capacity, polyacrylic acid-based absorbent resins such as sodium polyacrylate are preferred as the absorbent resin 44.
[0076] The sheet component 43 is liquid-permeable and can be made of nonwoven fabric, for example, hydrophilic fibers such as cellulose, synthetic fibers, or cotton yarn; or it can be made of hydrophobic fibers such as polyolefins (e.g., polypropylene, polyethylene), polyesters (e.g., PET), or polyamides (e.g., nylon), wherein the surface of the hydrophobic fibers is hydrophilicized by a surfactant. Alternatively, woven fabrics, knitted fabrics, or porous plastic films can also be used as the sheet component 43. Preferably, a nonwoven sheet component is used as the sheet component 43.
[0077] As for the sheet component 43, it is possible to set the sheet component on the skin side and the sheet component on the non-skin side separately, or to fold one sheet component, with the folded side serving as the sheet component on the skin side and the other side serving as the sheet component on the non-skin side.
[0078] The absorbent 4 has: a sealing portion 46 where sheet members 43 are joined to each other, and a non-sealing portion 47 where the sheet members 43 are not joined to each other. A water-absorbing resin 44 is disposed within the non-sealing portion 47. Multiple sealing portions 46 and multiple non-sealing portions 47 extend along the longitudinal direction y and are alternately arranged in the width direction x. The sealing portions 46 are formed by joining the sheet members 43 to each other using an adhesive or by welding the sheet members 43 together (heat sealing or ultrasonic welding, etc.). The non-sealing portions 47 are defined as portions where the sheet members 43 are not joined to each other; the portion other than the sealing portions 46 corresponds to the non-sealing portion 47. Furthermore, the absorbent 4 may also have water-absorbing resin 44 disposed within the sealing portion 46.
[0079] exist Figure 5In this process, an adhesive layer 45 is formed by coating an adhesive inside the sheet member 43. In the non-sealed portion 47, absorbent resin 44 is fixed to the sheet member 43 via the adhesive layer 45. While the adhesive layer 45 can be provided on at least one of the skin-side sheet member 43 and the non-skin-side sheet member 43, it is preferable that the adhesive layer 45 is provided on both. At least a portion of the absorbent resin 44 can be fixed to the adhesive layer 45. As long as the absorbent resin 44 is fixed to the sheet member 43 via the adhesive layer 45, the absorbent resin 44 is difficult to move between the sheet members 43 before absorption, easily ensuring the absorbent body 4's ability to absorb urine, etc. Even after absorption, the gelled absorbent resin 44 is difficult to move between the sheet members 43, resulting in the absorbent resin 44 becoming lumpy and less likely to cause discomfort to the wearer.
[0080] Preferably, the adhesive layer 45 fixes the absorbent resin 44 without hindering the absorption or swelling of the absorbent resin 44. To form such an adhesive layer 45, it is preferably formed by a curtain coating method, a spiral coating method, an omega coating method, a coater method, or the like.
[0081] Preferably, even if the absorbent resin 44 absorbs water, the sealing portion 46 still maintains the bonding between the sheet members 43. Therefore, even after the absorbent resin 44 absorbs water, the absorbent body 4's ability to absorb urine, etc., is easily ensured. According to this viewpoint, preferably, the sealing portion 46 is formed by bonding the sheet members 43 together with an adhesive such as a rubber-based adhesive or a styrene-based elastomer, or by fusing the sheet members 43 together.
[0082] In the absorbent body 4, the sealing portion 46 and the non-sealing portion 47 are configured as strips extending in the front-rear direction y. Preferably, the sealing portion 46 is formed to span the entire length of the front-rear direction y. If the absorbent body 4 is formed in this way, urine and the like can easily diffuse in the front-rear direction y at the sealing portion 46, and urine and the like entering the absorbent body 4 through the top sheet 2 can easily diffuse in the front-rear direction y on the absorbent body 4, and urine and the like can be quickly absorbed by the absorbent body 4. The non-sealing portion 47 is preferably provided in two or more rows side by side in the width direction x, and preferably in three or more rows. The sealing portion 46 is preferably provided in three or more rows side by side in the width direction x, and preferably in four or more rows.
[0083] The length of each sealing portion 46 in the width direction x is preferably 1 mm or more, more preferably 2 mm or more; furthermore, it is preferably 10 mm or less. Preferably, the length of each sealing portion 46 located on the outermost side in the width direction x is longer than the length of each sealing portion 46 located on the inner side in the width direction x. In the case of the sealing portions 46 located on the outermost side in the width direction x, the length of each of them in the width direction x is preferably 2 mm or more and 10 mm or less. The length of each sealing portion 46 located on the inner side in the width direction x is preferably shorter than the length of the sealing portion 46 located on the outermost side in the width direction x, preferably 1 mm or more and 5 mm or less. According to the above structure, when the absorbent resin 44 swells during the use of the absorbent article 1, the movement and swelling of the absorbent resin 44 in the width direction x are moderately suppressed without hindering the swelling.
[0084] The length of the width direction x of each non-sealing portion 47 is preferably 5 mm or more, more preferably 8 mm or more; furthermore, it is preferably 50 mm or less, more preferably 30 mm or less, and even more preferably 20 mm or less. Preferably, the length of the width direction x of each of the outermost non-sealing portions 47 is longer than the length of the width direction x of each of the inner non-sealing portions 46 located on the outermost non-sealing portion 47 in the width direction x.
[0085] Although the amount of water-absorbing resin 44 disposed in the non-sealing part 47 is not particularly limited, it is preferably 100 g / m 2 The above, more preferably 150g / m 2 The above; in addition, 400g / m³ is preferred. 2 Below. If the water-absorbing resin 44 is at 100g / m³ 2 If the above amounts are configured within the non-sealed portion 47, the absorption capacity of the absorbent 4 can be easily increased. On the other hand, if the water-absorbing resin 44 is at 400 g / m³... 2 If the following amount is configured in the non-sealed portion 47, even if the water-absorbing resin 44 absorbs water, it is easy to maintain the bonding between the sheet members 43 in the sealed portion 46.
Claims
1. An absorbent article having a front-to-back direction and a width direction, and having a top sheet and a back sheet and an absorbent body disposed between the top sheet and the back sheet, characterized in that, The top plate has thick-walled portions and thin-walled portions extending along the front-rear direction, and a plurality of the thick-walled portions and a plurality of the thin-walled portions are alternately arranged along the width direction; On the skin-side surface of the top sheet, the thin-walled portion is recessed compared to the thick-walled portion; on the non-skin-side surface of the top sheet, the thin-walled portion is recessed compared to the thick-walled portion. The thick-walled portion and the thin-walled portion extend from the area overlapping with the absorber to the front of the front edge of the absorber and the rear of the rear edge of the absorber; The non-skin-friendly side of the top sheet has: The first bonding area is coated with adhesive in a spiral or serpentine manner extending along the front-back direction; The second bonding area is fully coated with adhesive; The first adhesive region is disposed at least overlapping the absorbent, and the second adhesive region is disposed on the front and rear sides of the first adhesive region, and at least in front of the front edge of the absorbent and behind the rear edge of the absorbent.
2. The absorbent article according to claim 1, characterized in that, The second adhesive region is provided starting from the area that overlaps with at least one of the front end and rear end of the absorbent.
3. The absorbent article according to claim 2, characterized in that, In the region where at least one of the front end and rear end of the absorbent overlaps with the second adhesive region, the length of the overlapping region in the front-rear direction is less than 20% of the length of the absorbent in the front-rear direction.
4. The absorbent article according to any one of claims 1-3, characterized in that, The second bonding area has: The first region extends at least from the front edge of the absorber to the front edge of the top sheet; The second region extends at least from the rear edge of the absorber to the rear edge of the top sheet.
5. The absorbent article according to any one of claims 1-3, characterized in that, The front and rear edges of the absorber are formed in a straight line.
6. The absorbent article according to any one of claims 1-3, characterized in that, The absorbent has multiple sheet components, with absorbent resin disposed between the sheet components but no pulp fibers disposed therebetween. The absorber has: The sealing portion where the sheet components join together; The sheet components are non-sealed portions that are not joined to each other; the non-sealed portions are provided with water-absorbing resin; The plurality of sealing portions and the plurality of non-sealing portions extend along the front-back direction and are alternately arranged in the width direction.
7. The absorbent article according to any one of claims 1-3, characterized in that, The top sheet is made of non-woven fabric, and in the thin-walled portion, the non-woven fabric of the top sheet is heat-embossed.
8. The absorbent article according to any one of claims 1-3, characterized in that, The thick-walled portion and the thin-walled portion extend continuously from the front edge of the top sheet to the rear edge in the front-rear direction.