Absorbent articles

Abstract

To provide an absorbent article when a disposal tape is extended, making a part connected to the disposal tape less likely to float and making the disposal tape easily extend.SOLUTION: An absorbent article 1 comprises an absorbent body 2 having an absorber 3, and a disposal tape 10 on a non-skin-facing surface. The absorber 3 includes an absorption sheet configured to clamp an absorbent polymer between two same or different liquid permeable sheets. The disposal tape 10 is disposed at a position overlapped with the absorber 3 in plan view of the absorbent article 1, and in a thickness-directional area from the disposal tape 10 to the absorber 3, members from the disposal tape 10 to the liquid permeable sheet in the skin-facing surface side of the absorber 3 are integrated together.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an absorbent article provided with a disposal tape.

Background Art

[0002] As an absorbent article that can be disposed of easily and hygienically after use, an absorbent article having a disposal tape provided on the outer surface thereof and capable of maintaining the state of the absorbent article rolled up small with the disposal tape is known. For example, Patent Document 1 describes an absorbent article in which a tape fastener is fixed to the outer surface of the outer sheet of the rear waist panel. In the absorbent article of this document, the outer sheet and an illustration sheet arranged on the inner surface side of the outer sheet are joined, and thus, it is described in the document that there is no risk of a part of the outer sheet being torn when the tape fastener is used.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the absorbent article described in Patent Document 1, the tape fastener is positioned to overlap with the absorbent core in a plan view of the absorbent article. The absorbent core described in the same document is a mixture of superabsorbent polymer particles and fluff pulp. Because the absorbent core has such a structure, in the absorbent article described in the same document, when the tape fastener is pulled to use it, the absorbent core that overlaps with the tape fastener may unravel, causing the tape fastener to lift up together with the outer sheet and the illustration sheet. Therefore, the absorbent article described in the same document is difficult to stretch the tape fastener, and it is not easy to sufficiently prevent the tape fastener from peeling off the outer surface of the absorbent article. Therefore, the object of the present invention is to provide an absorbent article that can overcome the drawbacks of the prior art described above. [Means for solving the problem]

[0005] The present invention relates to an absorbent article comprising an absorbent body having an absorbent material, and having a disposal tape provided on the non-skin-facing side, The absorbent material includes an absorbent sheet having a structure in which an absorbent polymer is sandwiched between two identical or different liquid-permeable sheets, and the absorbent polymer is fixed by joining the two liquid-permeable sheets together. The aforementioned waste tape is positioned so as to overlap with the absorbent material in a plan view of the absorbent article. The present invention provides an absorbent article in which the components from the waste tape to the absorbent material to the liquid permeable sheet on the skin-facing side of the absorbent material are integrated in the thickness direction region from the waste tape to the absorbent material. [Effects of the Invention]

[0006] According to the present invention, an absorbent article is provided in which the portion attached to the waste tape does not easily lift up when the waste tape is stretched, and the waste tape is easy to stretch. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 is a plan view of a pant-type disposable diaper, which is one embodiment of the absorbent article of the present invention, when unfolded and extended, as seen from the skin-facing side. [Figure 2] Figure 2 is a cross-sectional view taken along line II-II in Figure 1. [Figure 3] Figure 3 is a cross-sectional view taken along line III-III in Figure 1. [Figure 4] Figure 4(a) is a schematic perspective view showing the process of stretching the disposal tape in forming the diaper disposal form shown in Figure 1, and Figure 4(b) is a schematic perspective view showing the disposal tape wrapped around the outer surface of the rolled-up diaper. [Figure 5] Figures 5(a) to (i) are plan views of the portion of the back outer casing where the waste tape is placed, as seen from the non-skin-facing side. [Figure 6] Figure 6(a) is a schematic cross-sectional view showing the absorbent sheet of the diaper shown in Figure 1, and Figure 6(b) is a schematic perspective view showing the same absorbent sheet. [Modes for carrying out the invention]

[0008] Figure 1 shows a disposable pant-type diaper (hereinafter also simply referred to as "diaper") 1, which is one embodiment of the absorbent article of the present invention. As shown in Figure 1, the diaper 1 has an abdominal portion A that is positioned on the wearer's abdominal side when worn, a dorsal portion B that is positioned on the wearer's back, and a crotch portion C located between the abdominal portion A and the dorsal portion B. The diaper 1 has a longitudinal direction X corresponding to the direction extending from the abdominal portion A through the crotch portion C to the dorsal portion B, and a transverse direction Y perpendicular to the longitudinal direction X.

[0009] The diaper 1 comprises an absorbent body 2 and an outer casing disposed on the non-skin-facing side of the absorbent body 2. The outer casing includes a ventral outer casing 4A disposed on the ventral side A and a dorsal outer casing 4B disposed on the dorsal side B. The absorbent body 2 is stretched and fixed between the ventral outer casing 4A and the dorsal outer casing 4B.

[0010] Diaper 1 is formed by joining together the ventral outer casing 4A's side portions 4e, 4e along the longitudinal direction X and the dorsal outer casing 4B's side portions 4f, 4f along the longitudinal direction X to form a pair of side seal portions (not shown), a waist opening (not shown), and a pair of leg openings (not shown).

[0011] The ventral outer casing 4A and the dorsal outer casing 4B each have an outer layer sheet 42, an inner layer sheet 41 positioned on the skin-facing side of the outer layer sheet 42, and a plurality of elastic members 43 positioned between the two sheets 41 and 42. In this embodiment, as shown in Figures 2 and 3, the members constituting the ventral outer casing 4A and the dorsal outer casing 4B are joined together by an adhesive 6. Specifically, the inner layer sheet 41 and the outer layer sheet 42 are joined together by the adhesive 6.

[0012] In this embodiment, the absorbent body 2, as shown in Figures 2 and 3, includes an absorbent 3, a surface sheet 21 disposed on the skin-facing side of the absorbent 3, and a back sheet 22 disposed on the non-skin-facing side of the absorbent 3. As shown in Figure 1, the absorbent 3 includes an upper absorbent 31 and a lower absorbent 32 disposed on the non-skin-facing side of the upper absorbent 31, but the absorbent 3 may be a single layer consisting only of the lower absorbent 32. As shown in Figure 2, the upper absorbent 31 and the lower absorbent 32 are integrally covered by a core wrap sheet 33, but if the absorbent consists only of the lower absorbent 32, only the lower absorbent 32 is covered by the core wrap sheet 33. In this specification, if the absorbent 3 consists only of the lower absorbent 32, the lower absorbent 32 may be read as the absorbent.

[0013] As shown in Figure 1, the lower absorbent 32 has a longer length in the vertical direction X than the upper absorbent 31. More specifically, the lower absorbent 32 has an extension portion 32e that extends from the dorsal side B edge of the upper absorbent 31. In this embodiment, the lower absorbent 32 is longer than the upper absorbent 31 not only in the vertical direction X but also in the horizontal direction Y.

[0014] The lower absorber 32 is composed of a single absorption sheet. The absorption sheet has a structure in which an absorbent polymer is sandwiched between two liquid-permeable sheets, either the same or different, and the absorbent polymer is fixed by joining the two liquid-permeable sheets together. Such an absorption sheet is manufactured by spraying particles of an absorbent polymer onto a wet liquid-permeable sheet and then laminating and pressing another sheet using the adhesiveness caused by the absorption of water by the particles. Such a manufacturing method is described, for example, in Japanese Patent Laid-Open No. 8-246395 related to a previous application of the present applicant.

[0015] In the present embodiment, as shown in FIG. 1, the length (width) of the upper absorber 31 in the lateral direction Y is not constant over the entire length in the longitudinal direction X, and the length in the lateral direction Y is longer and wider at one end side in the longitudinal direction X than at the other end side. In the present embodiment, among both end portions in the longitudinal direction X of the upper absorber 31, the relatively wider longitudinal end portions are arranged to be positioned on the ventral (front) side of the wearer of the absorbent article.

[0016] The upper absorber 31 is composed of, for example, a laminate of hydrophilic fibers such as cellulose including pulp, a mixed laminate of the hydrophilic fibers and an absorbent polymer, and the like.

[0017] In the present embodiment, as shown in FIGS. 2 and 3, each member constituting the absorbent main body 2 is joined by an adhesive 6. Specifically, the back sheet 22 and the portion covering the non-skin-facing surface of the lower absorber 32 in the core wrap sheet 33 are joined by the adhesive 6. Also, the extension portion 32e of the lower absorber 32 and the portion covering the skin-facing surface of the extension portion 32e in the core wrap sheet 33 are joined by the adhesive 6. Further, the portion covering the skin-facing surface of the extension portion 32e in the core wrap sheet 33 and the front sheet 21 are joined by the adhesive 6.

[0018] In this embodiment, as shown in FIGS. 1 to 3, a disposal tape 10 is provided on the non-skin-facing surface of the diaper 1. Specifically, the disposal tape 10 is fixed to the non-skin-facing surface of the back exterior body 4B, that is, the non-skin-facing surface of the outer layer sheet 42 of the back exterior body 4B.

[0019] The disposal tape 10 is arranged at a position overlapping the lower absorber layer 32 in the plan view of the diaper 1. The entire disposal tape 10 may overlap with the lower absorber layer 32, or only a part of it may overlap with the lower absorber layer 32. A part of the disposal tape 10 may overlap with the upper absorber layer 31, but it is preferably not overlapped. Details of the fixing position of the disposal tape 10 will be described later.

[0020] The disposal tape 10 is used to maintain the disposal form of the diaper 1. The disposal tape 10 is located at a substantially central portion in the lateral direction Y of the back exterior body 4B of the diaper 1. Also, the disposal tape 10 is provided such that its longitudinal direction coincides with the longitudinal direction X of the diaper 1.

[0021] FIG. 2 shows the cross-sectional structure of the disposal tape 10 in a three-folded state. The disposal tape 10 is mainly composed of three parts. Specifically, the disposal tape 10 is composed of a fixing part 12, an extension part 15, and a fastening part 18. These three parts are arranged along the longitudinal direction of the disposal tape 10 in this order. Also, these three parts are in a three-folded state laminated in this order. No other members are interposed between the fixing part 12 and the extension part 15, and the two are directly connected continuously. Similarly, no other members are interposed between the extension part 15 and the fastening part 18, and the two are directly connected continuously. In FIG. 2, for convenience of explanation, gaps are shown between the fixing part 12 and the extension part 15 and between the extension part 15 and the fastening part 18.

[0022] The fixing portion 12 of the disposal tape 10 has a fixing portion sheet piece 13. The fixing portion sheet piece 13 has a first surface 13a and a second surface 13b. In the disposal tape 10 which is folded in three, the fixing portion sheet piece 13 has its first surface 13a facing the extended portion 15 and its second surface 13b facing the outer surface of the diaper 1, except for the folded portion 13' which will be described later. The fixing portion 12 also has a fixing portion adhesive portion 14. The fixing portion adhesive portion 14 is provided on the second surface 13b of the fixing portion sheet piece 13. The fixing portion 12 is fixed to the outer surface of the back outer casing 4B of the diaper 1 by the fixing portion adhesive portion 14. The disposal tape 10 is irremovably fixed to the outer surface of the back outer casing 4B of the diaper 1 via this fixing portion adhesive portion 14. As a method for fixing the disposal tape 10 to the outer surface of the diaper 1, known methods such as hot-melt adhesives or fusion can be used. In this embodiment, the fixing part 12 has a shape that is elongated in one direction and has a longitudinal direction and a width direction.

[0023] The extension portion 15 has an extension portion sheet piece 16. The extension portion sheet piece 16 may be the same length as the fixing portion sheet piece 13 described above, or it may be a different length. Also, the extension portion sheet piece 16 may be the same width as the fixing portion sheet piece 13, or it may be a different width. The extension portion sheet piece 16 has a first surface 16a and a second surface 16b. In the tri-folded waste tape 10, the extension portion sheet piece 16 has its first surface 16a facing the fastening portion 18 and its second surface 16b facing the fixing portion 12, except for the portion that overlaps with the folded portion 16' and folded portion 13' described later.

[0024] The stretchable portion 15 has an adhesive portion 17 for the stretchable portion. The adhesive portion 17 for the stretchable portion is provided on the second surface 16b of the sheet piece 16 for the stretchable portion. The adhesive portion 17 for the stretchable portion is designed to repelly join the stretchable portion 15 and the fixing portion 12 in the tri-folded waste tape 10. Therefore, it is preferable that the adhesive portion 17 for the stretchable portion is made of a low-tack adhesive.

[0025] As shown in Figure 2, the fixing portion 12 has a sheet piece 13 for the fixing portion that has a folded portion 13' at one end in the long side direction X1 of the waste tape 10, which is folded back toward the extension portion 15. The folded portion 13' is joined to one end of the sheet piece 16 for the extension portion in the extension portion 15 on the side of the second surface 16b. In this way, the fixing portion 12 and the extension portion 15 are directly connected. As a method for connecting the fixing portion 12 and the extension portion 15, known methods such as adhesives such as hot melt adhesives, fusion, or a combination of these can be used.

[0026] The fastening portion 18 of the disposal tape 10 can be fastened at any position on the outer surface of the diaper 1, and is the portion that is fastened to the outer surface of the diaper 1 when the disposal form of the diaper 1 is maintained with the disposal tape 10. A pinch piece 23 is provided on the end of the fastening portion 18 opposite to the folded portion 16' of the extension portion 15 in the long side direction X1 of the disposal tape 10. The fastening portion 18 forms the tip area of ​​the disposal tape 10 and has a sheet piece 19 for the fastening portion. The sheet piece 19 for the fastening portion may be the same length as the sheet piece 13 for the fixing portion or the sheet piece 16 for the extension portion, or it may be a different length. The sheet piece 19 for the fastening portion may be the same width as the sheet piece 13 for the fixing portion or the sheet piece 16 for the extension portion, or it may be a different width. The sheet piece 19 for the fastening portion has a first surface 19a and a second surface 19b. In the tri-folded waste tape 10 of this embodiment, the fastening sheet piece 19 has its second surface 19b facing the extended portion 15.

[0027] The fastening portion 18 has an adhesive portion 20 for fastening. The adhesive portion 20 for fastening is provided on the second surface 19b of the sheet piece 19 for fastening. The adhesive portion 20 for fastening removably joins the fastening portion 18 and the stretched portion 15 of the tri-folded waste tape 10, and securely fastens the fastening portion 18 to any position on the outer surface of the diaper 1. From this viewpoint, it is preferable to determine the degree of adhesiveness of the adhesive portion 20 for fastening.

[0028] As mentioned earlier, the sheet piece 16 for the extension portion in the extension portion 15 has a folded portion 16' formed at one end in the long side direction X1, which is folded back towards the fastening portion 18. The folded portion 16' is joined to one end of the sheet piece 19 for the fastening portion in the fastening portion 18 on the side of the second surface 19b. In this way, the extension portion 15 and the fastening portion 18 are directly connected. A pinch piece 23 is joined to the other end of the sheet piece 19 for the fastening portion in the fastening portion 18 on the side of the second surface 19b. The pinch piece 23 is a separate sheet piece from the sheet piece 19 for the fastening portion. As methods for connecting the extension portion 15 and the fastening portion 18, and for joining the gripping piece 23 and the fastening portion sheet piece 19, known methods such as hot-melt adhesives, fusion, or a combination thereof can be used, respectively.

[0029] Figure 4(b) shows the disposal method of diaper 1 when it is used. When disposing of diaper 1, roll it up from the crotch area C towards the waist opening to create the rolled-up form shown in Figure 4(a). In the rolled-up form of diaper 1, the disposal tape 10 provided on the back side B is exposed on the outside of the rolled-up diaper 1. Next, as shown in Figure 4(a), while holding the rolled-up diaper 1 with one hand, grasp the pinch piece 23 with the other hand and pull to release the three-fold state of the disposal tape 10. While stretching the extension portion, wrap the disposal tape 10 around the outer circumference of the rolled-up diaper 1, and fasten the fastening portion 18 to an appropriate position on the outer surface of the rolled-up diaper 1. Note that Figure 4(b) shows an example where the fastening portion 18 is fastened on the fixing portion 12, but the position where the fastening portion 18 is fastened is not limited to the components of the disposal tape 10.

[0030] In the embodiment shown in Figure 1, the components from the disposal tape 10 to the liquid permeable sheet on the skin-facing side of the lower absorbent layer 32 are integrated in the thickness direction region from the disposal tape 10 to the lower absorbent layer 32. This point will be described in detail below. In this embodiment, adjacent components are joined together in the thickness direction region from the disposal tape 10 to the liquid permeable sheet on the skin-facing side of the lower absorbent layer 32. More specifically, as described above, the back outer casing 4B and the absorbent body 2 are joined together by adhesives 6 and 27. Furthermore, both the back outer casing 4B and the absorbent body 2 are joined together by adhesive 6, as shown in Figures 2 and 3. In addition, the disposal tape 10 is joined to the outer surface of the back outer casing 4B by the adhesive part 14 for fixing. The location of each adhesive 6 and 27 joining adjacent components may or may not overlap with the disposal tape 10 in a plan view of the diaper 1.

[0031] In the present invention, "the members from the disposal tape to the liquid permeable sheet on the skin-facing side of the lower absorbent layer are integrated in the thickness direction region from the disposal tape to the lower absorbent layer" means that each adhesive 6, 27 joining adjacent members from the disposal tape 10 to the liquid permeable sheet on the skin-facing side of the lower absorbent layer 32 is located within a tape vicinity region R, which consists of a region located near the fixing portion 12 of the disposal tape 10 and a region overlapping with the fixing portion 12, in a plan view of the diaper 1. Here, the tape vicinity region R means a region in a plan view of the diaper 1 where, when the length L in the width direction Y of the fixing portion 12 of the disposal tape 10 is 100, the distance D from the periphery of the fixing portion 12 is preferably 150 or less, more preferably 100 or less, and even more preferably 75 or less (see Figures 5(a) to (i)). More specifically, the tape vicinity region R is a region where the distance D is preferably 15 mm or less, more preferably 10 mm or less, and even more preferably 5 mm or less (see Figures 5(a) to (i)).

[0032] The locations of the adhesives 6,27 that join adjacent members in the thickness direction may all overlap or only partially overlap.

[0033] The adhesives 6 and 27 that join adjacent members in the thickness direction may be applied to the entire area between each member, or to only a portion of the area between each member. For example, each adhesive 6 and 27 may be applied only to the position that overlaps with the fixing portion 12 of the disposal tape 10 in a plan view of the diaper 1. The application pattern of the adhesive 6,27 is not particularly limited and may be, for example, stripe-like, spiral-like, etc. Furthermore, the adhesives 6, 27 used to join adjacent members in the thickness direction may be of the same type or different types.

[0034] The advantages of integrating the components from the waste tape 10 to the liquid-permeable sheet on the skin-facing side of the lower absorbent layer 32 are as follows. If the components from the disposal tape 10 to the liquid-permeable sheet on the skin-facing side of the lower absorbent layer 32 are integrated, then when the tri-folded disposal tape 10 is unfolded and stretched as shown in Figure 4(a), the components from the disposal tape 10 to the liquid-permeable sheet on the skin-facing side of the lower absorbent layer 32 are lifted as a single unit. Therefore, it is possible to prevent only the back outer casing 4B and the components in its vicinity, which are the components to which the disposal tape 10 is directly fixed, from lifting up. In other words, it is possible to prevent the force applied when the disposal tape 10 is pulled from concentrating at the joint between the disposal tape 10 and the component to which the disposal tape 10 is directly attached. As a result, the disposal tape 10 becomes less likely to peel off the outer surface of the diaper 1. Due to this, the diaper 1 of this embodiment has the advantageous effect of making it easier to stretch the disposal tape 10.

[0035] The positional relationship between the adhesives 6, 27 joining adjacent components and the tape vicinity region R when the components from the waste tape 10 to the liquid permeable sheet on the skin-facing side of the lower absorbent 32 are integrated will be explained using the first adhesive 6a joining the back outer casing 4B and the back sheet 22, and the second adhesive 6b joining the back sheet 22 and the lower absorbent 32 as examples, with reference to Figures 5(a) to (i). In Figures 5(a) to (i), the areas where the first adhesive 6a is applied are marked with a downward-sloping diagonal line to the right, and the areas where the second adhesive 6b is applied are marked with a downward-sloping diagonal line to the left. Figure 5(a) shows a state in which a part of the back outer casing 4B and the back sheet 22 has been broken.

[0036] In the example shown in Figure 5(a), the first adhesive 6a is applied in a stripe pattern extending in the horizontal direction Y, and the second adhesive 6b is applied in a stripe pattern extending in the vertical direction X. The distance Sa between adjacent first adhesives 6a, 6a in the vertical direction X is longer than the length Lx in the vertical direction of the fixing portion 12 of the disposal tape 10, and the first adhesives 6a do not overlap with the fixing portion 12 of the disposal tape 10 in a plan view of the diaper 1. However, the first adhesives 6a are located within the tape vicinity region R. Furthermore, the distance Sb between adjacent second adhesives 6b, 6b in the lateral direction Y is longer than the length Ly in the lateral direction of the fixing portion 12 of the disposal tape 10, and the second adhesives 6b do not overlap with the fixing portion 12 of the disposal tape 10 in a plan view of the diaper 1. However, the second adhesives 6b are located within the tape vicinity region R. Therefore, in the example shown in Figure 5(a), the components from the waste tape 10 to the liquid-permeable sheet on the skin-facing side of the lower absorbent 32 are integrated, and the above-mentioned effects are achieved.

[0037] In the example shown in Figure 5(b), the first adhesive 6a is applied in a stripe pattern extending in the horizontal direction Y, and the second adhesive 6b is applied in a stripe pattern extending in the vertical direction X. The distance Sa between adjacent first adhesives 6a, 6a in the vertical direction X is shorter than the length Lx in the vertical direction of the fixing portion 12 of the disposal tape 10, and the first adhesives 6a overlap with the fixing portion 12 of the disposal tape 10 in a plan view of the diaper 1. The distance Sb between adjacent second adhesives 6b, 6b in the lateral direction Y is longer than the length Ly in the lateral direction of the fixing portion 12 of the disposal tape 10, and the second adhesives 6b do not overlap with the fixing portion 12 of the disposal tape 10 in a plan view of the diaper 1. However, the second adhesives 6b are located within the tape vicinity region R. Therefore, in the example shown in Figure 5(b), the components from the waste tape 10 to the liquid-permeable sheet on the skin-facing side of the lower absorbent 32 are integrated.

[0038] In the example shown in Figure 5(c), the first adhesive 6a is applied in a stripe pattern extending in the horizontal direction Y, and the second adhesive 6b is applied in a stripe pattern extending in the vertical direction X. The distance Sa between adjacent first adhesives 6a, 6a in the vertical direction X is longer than the length Lx in the vertical direction of the fixing portion 12 of the disposal tape 10, and the first adhesives 6a do not overlap with the fixing portion 12 of the disposal tape 10 in a plan view of the diaper 1. However, the first adhesives 6a are located within the tape vicinity region R. The distance Sb between adjacent second adhesives 6b, 6b in the lateral direction Y is shorter than the length Ly in the lateral direction of the fixing portion 12 of the disposal tape 10, and the second adhesives 6b overlap with the fixing portion 12 of the disposal tape 10 in a plan view of the diaper 1. Therefore, in the example shown in Figure 5(c), the components from the waste tape 10 to the liquid-permeable sheet on the skin-facing side of the lower absorbent 32 are integrated. In the example shown in Figure 5(b) or (c), in a plan view of the diaper 1, the first adhesive 6a or the second adhesive 6b overlaps with the fixing portion 12 of the disposal tape 10. Therefore, compared to the example shown in Figure 5(a), the components from the disposal tape 10 to the liquid-permeable sheet on the skin-facing side of the lower absorbent layer 32 become more firmly integrated, and the above-mentioned effects are even more pronounced.

[0039] In the example shown in Figure 5(d), the first adhesive 6a is applied in a stripe pattern extending in the lateral direction Y, and the second adhesive 6b is applied continuously over the entire area between the back sheet 22 and the lower absorbent layer 32. The distance Sa between adjacent first adhesives 6a, 6a in the vertical direction X is longer than the length Lx in the vertical direction of the fixing portion 12 of the disposal tape 10, and the first adhesives 6a do not overlap with the fixing portion 12 of the disposal tape 10 in a plan view of the diaper 1. However, the first adhesives 6a are located within the tape vicinity region R. Therefore, in the example shown in Figure 5(d), the components from the waste tape 10 to the liquid-permeable sheet on the skin-facing side of the lower absorbent 32 are integrated.

[0040] In the example shown in Figure 5(e), the first adhesive 6a is continuously applied over the entire area between the back outer casing 4B and the back sheet 22, while the second adhesive 6b is applied in a stripe pattern extending in the vertical direction X. The distance Sb between adjacent second adhesives 6b, 6b in the lateral direction Y is longer than the length Ly in the lateral direction of the fixing portion 12 of the disposal tape 10, and the second adhesives 6b do not overlap with the fixing portion 12 of the disposal tape 10 in a plan view of the diaper 1. However, the second adhesives 6b are located within the tape vicinity region R. Therefore, in the example shown in Figure 5(e), the components from the waste tape 10 to the liquid-permeable sheet on the skin-facing side of the lower absorbent layer 32 are integrated. In the example shown in Figure 5(d) or (e), in a plan view of the diaper 1, the first adhesive 6a or the second adhesive 6b overlaps with the entire area of ​​the fixing portion 12 of the disposal tape 10. Therefore, compared to the example shown in Figure 5(b) or (c), the components from the disposal tape 10 to the liquid-permeable sheet on the skin-facing side of the lower absorbent layer 32 are more firmly integrated, and the above-mentioned effects are even more pronounced.

[0041] In the example shown in Figure 5(f), the first adhesive 6a is applied in a stripe pattern extending in the horizontal direction Y, and the second adhesive 6b is applied in a stripe pattern extending in the vertical direction X. The distance Sa between adjacent first adhesives 6a, 6a in the vertical direction X is shorter than the length Lx in the vertical direction of the fixing portion 12 of the disposal tape 10, and the first adhesives 6a overlap with the fixing portion 12 of the disposal tape 10 in a plan view of the diaper 1. Furthermore, the distance Sb between adjacent second adhesives 6b, 6b in the lateral direction Y is shorter than the length Ly in the lateral direction of the fixing portion 12 of the disposal tape 10, and the second adhesives 6b overlap with the fixing portion 12 of the disposal tape 10 in a plan view of the diaper 1. Therefore, in the example shown in Figure 5(f), the components from the waste tape 10 to the liquid-permeable sheet on the skin-facing side of the lower absorbent 32 are integrated. In the example shown in Figure 5(f), in a plan view of the diaper 1, both the first adhesive 6a and the second adhesive 6b overlap with the fixing portion 12 of the disposal tape 10. Therefore, compared to the example shown in Figure 5(d) or (e), the components from the disposal tape 10 to the liquid-permeable sheet on the skin-facing side of the lower absorbent layer 32 are more firmly integrated, and the above-mentioned effects are even more pronounced.

[0042] In the example shown in Figure 5(g), the first adhesive 6a is continuously applied over the entire area between the back outer casing 4B and the back sheet 22, while the second adhesive 6b is applied in a stripe pattern extending in the vertical direction X. The distance Sb between adjacent second adhesives 6b, 6b in the lateral direction Y is shorter than the length Ly in the lateral direction of the fixing portion 12 of the disposal tape 10, and the second adhesives 6b overlap with the fixing portion 12 of the disposal tape 10 in a plan view of the diaper 1. Therefore, in the example shown in Figure 5(g), the components from the waste tape 10 to the liquid-permeable sheet on the skin-facing side of the lower absorbent layer 32 are integrated.

[0043] In the example shown in Figure 5(h), the first adhesive 6a is applied in a stripe pattern extending in the lateral direction Y, and the second adhesive 6b is applied continuously over the entire area between the back sheet 22 and the lower absorbent layer 32. The distance Sa between adjacent first adhesives 6a, 6a in the vertical direction X is shorter than the length Lx in the vertical direction of the fixing portion 12 of the disposal tape 10, and the first adhesives 6a overlap with the fixing portion 12 of the disposal tape 10 in a plan view of the diaper 1. Therefore, in the example shown in Figure 5(h), the components from the waste tape 10 to the liquid-permeable sheet on the skin-facing side of the lower absorbent 32 are integrated. In the example shown in Figure 5(g) or (h), in a plan view of the diaper 1, both the first adhesive 6a and the second adhesive 6b overlap with the fixing portion 12 of the disposal tape 10, and either the first adhesive 6a or the second adhesive 6b overlaps with the entire area of ​​the fixing portion 12 of the disposal tape 10. Therefore, compared to the example shown in Figure 5(f), the components from the disposal tape 10 to the liquid-permeable sheet on the skin-facing side of the lower absorbent layer 32 are integrated more firmly, and the above-mentioned effects are even more pronounced.

[0044] In the example shown in Figure 5(i), the first adhesive 6a is continuously applied over the entire area between the back outer casing 4B and the back sheet 22, and the second adhesive 6b is continuously applied over the entire area between the back sheet 22 and the lower absorbent layer 32. Therefore, in the example shown in Figure 5(i), the components from the waste tape 10 to the lower absorbent layer 32 are integrated. In the example shown in Figure 5(i), in a plan view of the diaper 1, both the first adhesive 6a and the second adhesive 6b overlap the entire area of ​​the fixing portion 12 of the disposal tape 10. Therefore, compared to the example shown in Figure 5(g) or (h), the components from the disposal tape 10 to the liquid-permeable sheet on the skin-facing side of the lower absorbent layer 32 are more firmly integrated, and the above-mentioned effects are even more pronounced.

[0045] In the thickness region from the disposal tape 10 to the liquid-permeable sheet on the skin-facing side of the lower absorbent layer 32, it is preferable that at least a portion of the adhesives 6a and 6b joining adjacent members overlap in the tape vicinity region R in a plan view of the diaper 1, as shown in Figures 5(a) to (e), from the viewpoint of ensuring that the above-mentioned effects are reliably achieved. Furthermore, in order to further enhance the above-mentioned effects, it is even more preferable that at least a portion of the adhesives 6a and 6b joining adjacent members overlap in the region that overlaps with the fixing portion 12 of the disposal tape 10 in a plan view of the diaper 1, as shown in Figures 5(f) to (h), and even more preferable that all of the adhesives 6a and 6b located within the region that overlaps with the fixing portion 12 of the disposal tape 10 in a plan view of the diaper 1, as shown in Figure 5(i).

[0046] In the case of the tri-folded disposal tape 10, from the viewpoint of making the above-mentioned effects even more pronounced, it is preferable that at least the area of ​​the fixing portion 12 that overlaps with the area S (see Figure 2) from the end of the disposal tape 10 on the crotch side C to the end of the pinch piece 23 on the crotch side C overlaps with the lower absorbent material 32 in a plan view of the diaper 1.

[0047] In the tri-folded disposal tape 10, it is preferable that the fixing portion 12 is positioned so as to overlap with the extended portion 32e (see Figure 1) of the lower absorbent layer 32 in a plan view of the diaper 1. Since the extended portion 32e of the lower absorbent layer 32 is the part that extends from the upper absorbent layer 31, the upper absorbent layer 31 is not present in the extended portion 32e in a plan view of the diaper 1. By positioning the fixing portion of the tri-folded disposal tape 10 so as to overlap with the extended portion 32e of the lower absorbent layer 32, it is more effectively prevented that the upper absorbent layer 31 will unravel when the disposal tape 10 is pulled, and that the member to which the disposal tape 10 is directly fixed (in this embodiment, the back outer casing 4B) will not lift up. From the viewpoint of making this effect even more pronounced, in the tri-folded waste tape 10, it is preferable that at least the area of ​​the fixing portion 12 that overlaps with the area S from the end of the waste tape 10 on the crotch side C to the end of the gripping piece 23 on the crotch side C overlaps with the extended portion 32e of the lower absorbent 32.

[0048] In a plan view, the tri-folded waste tape 10 may have its entire fixing portion 12 overlapping the extended portion 32e of the lower absorbent 32, or only a portion of it may overlap the extended portion 32e of the lower absorbent 32. If only a portion of the fixing portion 12 overlaps the extended portion 32e of the lower absorbent 32, the other portion of the fixing portion 12 may overlap the upper absorbent 31, but it is preferable that it does not overlap. However, from the viewpoint of more effectively preventing the upper absorbent 31 from unraveling when the waste tape 10 is pulled and the member to which the waste tape 10 is directly fixed from lifting up, it is preferable that, in a plan view, the entire fixing portion 12 of the tri-folded waste tape 10 overlaps the extended portion 32e of the lower absorbent 32. Since the waste tape 10, and especially the fixing portion 12 of the waste tape 10, does not overlap with the upper absorbent 31, it is possible to prevent the upper absorbent 31 from unraveling when the waste tape 10 is pulled, thereby more effectively preventing the member to which the waste tape 10 is directly fixed (in this embodiment, the back outer casing 4B) from lifting up.

[0049] As shown in Figure 1, the diaper 1 of this embodiment has a polymer-free region 5 in the extended portion 32e of the lower absorbent layer 32 where absorbent polymer is absent. The diaper 1 may have only one polymer-free region 5, or it may have two or more. Figure 1 shows a state in which there are two polymer-free regions 5. The shape of the polymer-free region 5 is not particularly limited and may be, for example, rectangular, elliptical, or circular. Figure 1 shows a polymer-free region 5 that has a rectangular shape that is long in the vertical direction X of the diaper 1. Note that the absence of absorbent polymer means that absorbent polymer is substantially absent, and does not negate the presence of absorbent polymer that has been unintentionally scattered.

[0050] In this embodiment, the polymer-free region 5 is a slit that penetrates the lower absorbent layer 32. The polymer-free region 5 is not limited to being continuous, as long as it has a rectangular shape that is long in the longitudinal direction X of the diaper 1, but may also be a discontinuous sequence of points or a series of short line segments along the longitudinal direction.

[0051] Preferably, in a plan view of the diaper 1, the fixing portion 12 of the disposal tape 10 is positioned so that it overlaps with the polymer-free region 5. This ensures that even when the lower absorbent layer 32 absorbs liquid and the absorbent polymer in the lower absorbent layer 32 swells, the two liquid-permeable sheets contained in the lower absorbent layer 32 do not easily separate at the position where they overlap with the fixing portion 12. This further effectively prevents the member to which the disposal tape 10 is directly fixed from lifting when the disposal tape 10 is pulled. The fixing portion 12 may overlap entirely with the polymer-free region 5, or only a part of it may overlap with the polymer-free region 5. If there are multiple polymer-free regions 5, the fixing portion 12 may overlap some of the polymer-free regions 5 in a plan view, or it may overlap with all of the polymer-free regions 5. From the viewpoint of more effectively preventing the member to which the waste tape 10 is directly fixed from lifting up, it is preferable that, in the waste tape 10, at least the area of ​​the fixing portion 12 that overlaps with the region S (see Figure 2) from the end of the waste tape 10 on the crotch side C to the end of the gripping piece 23 on the crotch side C overlaps with the polymer-free region 5 in a plan view.

[0052] The absorbent sheet constituting the lower absorbent layer 32 is preferably structured such that the absorbent polymer 26 is fixed by an adhesive 27 between two identical or different liquid-permeable sheets 25a and 25b, as shown in Figures 6(a) and (b). Such an absorbent sheet structure is described, for example, in the Japanese Patent Application Publication No. 2018-102907, an earlier application of the present applicant.

[0053] In the absorbent sheet 25 shown in Figures 6(a) and (b), the adhesive 27 is arranged on the surface of each sheet 25a and 25b facing the absorbent polymer 26. Each liquid-permeable sheet 25a and 25b in the absorbent sheet 25 has a portion 28 where they are directly joined by the adhesive 27 without going through the absorbent polymer 26, and a portion 29 where both liquid-permeable sheets 25a and 25b are joined by the adhesive 27 via the absorbent polymer particles 26. This configuration allows the absorbent polymer particles 26 to be held in a predetermined position on the absorbent sheet 25, further reducing unintended movement and uneven distribution of the absorbent polymer particles 26, and further improving the liquid absorbency of the absorbent sheet 25.

[0054] As the adhesive 27 in the absorbent sheet 25, it is preferable to use one that has flexibility to stretch in accordance with the swelling change accompanying the liquid absorption of the absorbent polymer 26. Examples of such raw materials include acrylic adhesives containing one or more vinyl monomer (co)polymers such as 2-ethylhexyl acrylate, butyl acrylate, ethyl acrylate, cyanoacrylate, vinyl acetate, methyl methacrylate, etc. (such as ethylene vinyl acetate copolymer), silicone adhesives containing polydimethylsiloxane polymer polymers, natural rubber adhesives containing natural rubber, isoprene adhesives containing one or more polyisoprene, chloroprene, etc., styrene-butadiene copolymer (SBR), styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene-butadiene-styrene block copolymer (SEBS), styrene-ethylene-propylene-styrene block copolymer (SEPS), and other rubber adhesives. These may be used individually or in combination of two or more. As shown in Figure 6, when the adhesive 27 is placed on the surfaces of each sheet 25a and 25b facing the absorbent polymer 26, the adhesive placed on one liquid-permeable sheet 25a and the adhesive placed on the other liquid-permeable sheet 25b may be of the same type or different types.

[0055] In the absorbent sheet 25, it is preferable that the two liquid-permeable sheets 25a and 25b are bonded together by the adhesive 27, even when the absorbent polymer 26 absorbs liquid and swells in the area that overlaps with the disposal tape 10, more specifically the fixing portion 12 of the disposal tape 10, when the diaper 1 is viewed from above. By using such an absorbent sheet 25 as the lower absorbent layer 32, even when the lower absorbent layer 32 absorbs liquid and the absorbent polymer 26 of the lower absorbent layer 32 swells, the two liquid-permeable sheets 25a and 25b contained in the lower absorbent layer 32 are less likely to separate, thus more effectively preventing the disposal tape 10 from lifting when the disposal tape 10 is pulled.

[0056] Here, the state in which the absorbent polymer 26 has absorbed liquid and swollen means the state in which the absorbent polymer 26 has absorbed urine, etc., to a saturated state. From the viewpoint of more effectively preventing the disposal tape 10 from floating up when the disposal tape 10 is pulled, it is preferable that the two liquid permeable sheets 25a and 25b are bonded together by adhesive 27 so that even when the amount of liquid absorbed by the absorbent polymer 26 reaches the saturated water absorption capacity of the absorbent polymer 26, the bond between the two liquid permeable sheets 25a and 25b is maintained, and the two liquid permeable sheets 25a and 25b do not peel off from each other. More specifically, it is preferable that the two liquid permeable sheets 25a and 25b do not peel off from each other even when the absorbent sheet 25 is immersed in physiological saline for 30 minutes.

[0057] In this embodiment, it is preferable that the waste tape 10, which is folded into a tri-fold state, has opposing surfaces in the thickness direction that are joined together in a peelable manner. It is also preferable that the stretch portion 15 of the waste tape 10 is stretchable in the direction of the long side of the waste tape 10. By configuring the waste tape 10 in this way, when the waste tape 10 is pulled, the stretch portion 15 of the waste tape 10 stretches, so even when the diaper 1 absorbs liquid and swells, the waste tape 10 can be easily wrapped around the outer circumference of the diaper 1, and the diaper 1 can be easily disposed of.

[0058] In this embodiment, the absorbent 3 included an upper absorbent 31 and a lower absorbent 32. However, the absorbent 3 may instead consist only of the lower absorbent 32 and not include the upper absorbent 31. In other words, the absorbent 3 may consist only of an absorbent sheet. The advantages of the absorbent 3 consisting only of an absorbent sheet are as follows: Because the absorbent 3 consists only of an absorbent sheet and does not have an upper absorbent 31, the upper absorbent 31 does not unravel when the waste tape 10 is pulled, thus more effectively preventing the member to which the waste tape 10 is directly fixed (in this embodiment, the back outer casing 4B) from lifting up.

[0059] Next, the constituent materials of the diaper 1 of this embodiment will be described. As the surface sheet 21, a liquid-permeable sheet such as a nonwoven fabric or a perforated film can be used. The surface sheet 21 may have an uneven surface on the side facing the skin. For example, multiple protrusions can be formed in a scattered pattern on the side facing the skin of the surface sheet 21. Alternatively, alternating ridges and grooves extending in one direction can be formed on the side facing the skin of the surface sheet 21. For such purposes, the surface sheet 21 can also be formed using two or more nonwoven fabrics.

[0060] On the other hand, the backing sheet 22 can be, for example, a liquid-impermeable film or a spunbond, meltblown, or spunbond laminated nonwoven fabric. A liquid-impermeable film may be provided with multiple micropores to give it water vapor permeability. To further improve the feel of the absorbent article, a sheet with a good texture, such as a nonwoven fabric, may be laminated to the outer surface of the backing sheet 22.

[0061] For example, the core wrap sheet 33 can be made of tissue paper made of hydrophilic fibers or a nonwoven fabric that is permeable to liquids.

[0062] As the liquid-permeable sheet that constitutes the lower absorbent layer 32, a fiber sheet mainly made of fibrous material such as wood pulp can be used.

[0063] Although the present invention has been described above based on its embodiments, the present invention can be modified as appropriate without being limited to the above embodiments. For example, in the embodiment shown in Figure 1, the upper absorber 31 had a longer length in the lateral direction Y and a wider width at one end in the vertical direction X compared to the other end. However, the upper absorber 31 may have a constant length (width) in the lateral direction Y along its entire length in the vertical direction X.

[0064] Furthermore, in the above-described embodiment, the members constituting the absorbent body 2, the ventral outer casing 4A, and the dorsal outer casing 4B were joined together by adhesive 6. However, adjacent members in the thickness direction may be joined together by joining means other than adhesive, such as heat fusion or pressure bonding. Alternatively, joining by adhesive and joining by other means may be combined. Even if adjacent members from the waste tape 10 to the liquid permeable sheet on the skin-facing side of the lower absorbent 32 are joined together by joining means other than adhesive, the effect of the present invention is achieved in that the portion joined to the waste tape 10 is less likely to lift when the waste tape 10 is stretched, and the waste tape 10 is easier to stretch. When adjacent members from the waste tape 10 to the liquid permeable sheet on the skin-facing side of the lower absorbent 32 are joined together by joining means other than adhesive, it is preferable that the arrangement pattern of the joints between adjacent members be the same as the arrangement pattern of adhesive 6 in the above-described embodiment.

[0065] With regard to the embodiments described above, the present invention further discloses the following absorbent articles. <1> An absorbent article comprising an absorbent body having an absorbent material, and having a disposal tape provided on the non-skin-facing side, The absorbent material includes an absorbent sheet having a structure in which an absorbent polymer is sandwiched between two identical or different liquid-permeable sheets, and the absorbent polymer is fixed by joining the two liquid-permeable sheets together. The aforementioned waste tape is positioned so as to overlap with the absorbent material in a plan view of the absorbent article. An absorbent article in which the members from the waste tape to the absorbent material to the liquid permeable sheet on the skin-facing side of the absorbent material are integrated in the thickness direction region from the waste tape to the absorbent material.

[0066] <2> The absorbent body consists only of the absorbent sheet, <1> Absorbent articles as described above. <3> The absorbent body includes an upper absorbent layer and a lower absorbent layer disposed on the non-skin-facing side of the upper absorbent layer. The lower absorbent is made of the absorbent sheet, <1> Absorbent articles as described above.

[0067] <4> The absorbent article has an abdominal portion that is positioned on the wearer's abdominal side when worn, a dorsal portion that is positioned on the wearer's back, and a crotch portion located between the abdominal portion and the dorsal portion. The aforementioned disposal tape has a fixing portion, an extendable portion, and a fastening portion fixed to the outer surface of the absorbent article, arranged in this order along the longitudinal direction extending from the ventral side through the crotch area to the dorsal side, and is provided on the outer surface of the absorbent article in a tri-fold state stacked in this order. Each adhesive that joins adjacent members in the thickness direction region from the waste tape to the lower absorbent layer is located within a tape vicinity region, which in a plan view of the absorbent article consists of a region located near the fixing portion of the waste tape and a region overlapping with the fixing portion. <3> Absorbent articles as described above. <5> The tape vicinity region is a region in a plan view of the absorbent article where, when the widthwise length of the fixing portion of the waste tape is 100, the distance from the periphery of the fixing portion is preferably 150 or less, more preferably 100 or less, and even more preferably 75 or less. <4> Absorbent articles as described above. <6> The tape vicinity region is preferably a region where the distance from the periphery of the fixing portion of the waste tape is 15 mm or less, more preferably 10 mm or less, and even more preferably 5 mm or less. <4> or the above <5> Absorbent articles as described above. <7> The absorbent article has an abdominal portion positioned on the wearer's abdominal side, a dorsal portion positioned on the wearer's back, and a crotch area located between the abdominal and dorsal portions. The aforementioned disposal tape has a fixing portion, an extendable portion, and a fastening portion fixed to the outer surface of the absorbent article, arranged in this order along the longitudinal direction extending from the ventral side through the crotch area to the dorsal side, and is provided on the outer surface of the absorbent article in a tri-fold state stacked in this order. In the aforementioned vertical direction, a pinch is provided at the end of the fastening portion opposite to the extension portion. In the tri-folded waste tape, at least the portion of the fixing part that overlaps with the area from the end of the waste tape on the crotch side to the end of the gripping piece on the crotch side is positioned so as to overlap with the lower absorbent layer in a plan view of the absorbent article. <3> ~the aforementioned <6> The absorbent article described in any one of the following.

[0068] <8> The absorbent article has an abdominal portion that is positioned on the wearer's abdominal side when worn, a dorsal portion that is positioned on the wearer's back, and a crotch portion located between the abdominal portion and the dorsal portion. The lower absorbent has an extended portion that extends from the back-side edge of the upper absorbent, The aforementioned waste tape is positioned in a location that overlaps with the extended portion in a plan view of the absorbent article. <3> ~the aforementioned <7> The absorbent article described in any one of the following. <9> The aforementioned waste tape is positioned so as not to overlap with the upper absorbent layer in a plan view of the absorbent article. <8> Absorbent articles as described above. <10> The aforementioned disposal tape has a fixing portion, an extendable portion, and a fastening portion fixed to the outer surface of the absorbent article, arranged in this order along the longitudinal direction extending from the ventral side through the crotch area to the dorsal side, and is provided on the outer surface of the absorbent article in a tri-fold state stacked in this order. The tri-folded waste tape is positioned such that the fixing portion overlaps with the extended portion of the lower absorbent in a plan view of the absorbent article. <8> or the above <9> Absorbent articles as described above. <11> In the longitudinal direction extending from the ventral portion through the crotch area to the dorsal portion, a pinch is provided at the end of the fastening portion opposite to the extension portion. In the tri-folded waste tape, at least the portion of the fixing part that overlaps with the area from the end of the waste tape on the crotch side to the end of the gripping piece on the crotch side is positioned to overlap with the extended portion of the lower absorbent, <10> Absorbent articles as described above.

[0069] <12> The lower absorbent has at least a polymer-free region in the extended portion where the absorbent polymer is not present. The aforementioned waste tape is positioned in a location that overlaps with the polymer-free region in a plan view of the absorbent article. <8> ~the aforementioned <11> The absorbent article described in any one of the following. <13> The aforementioned disposal tape has a fixing portion, an extendable portion, and a fastening portion fixed to the outer surface of the absorbent article, arranged in this order along the longitudinal direction extending from the ventral side through the crotch area to the dorsal side, and is provided on the outer surface of the absorbent article in a tri-fold state stacked in this order. The aforementioned waste tape is positioned such that, in a plan view of the absorbent article, the fixing portion overlaps with the polymer-free region. <12> Absorbent articles as described above. <14> The aforementioned disposal tape has a fixing portion, an extendable portion, and a fastening portion fixed to the outer surface of the absorbent article, arranged in this order along the longitudinal direction extending from the ventral side through the crotch area to the dorsal side, and is provided on the outer surface of the absorbent article in a tri-fold state stacked in this order. The fixed portion is such that its entirety overlaps with the polymer-free region. <12> or the above <13> Absorbent articles as described above. <15> The aforementioned disposal tape has a fixing portion, an extendable portion, and a fastening portion fixed to the outer surface of the absorbent article, arranged in this order along the longitudinal direction extending from the ventral side through the crotch area to the dorsal side, and is provided on the outer surface of the absorbent article in a tri-fold state stacked in this order. The aforementioned fixing portion is such that only a portion of it overlaps with the polymer-free region. <12> or the above <13> Absorbent articles as described above. <16> The aforementioned disposal tape has a fixing portion, an extendable portion, and a fastening portion fixed to the outer surface of the absorbent article, arranged in this order along the longitudinal direction extending from the ventral side through the crotch area to the dorsal side, and is provided on the outer surface of the absorbent article in a tri-fold state stacked in this order. In the longitudinal direction of the absorbent article, a pinch is provided at the end of the fastening portion opposite to the extension portion. In the aforementioned waste tape, at least the portion of the fixing part that overlaps with the region from the end of the waste tape on the crotch side to the end of the gripping piece on the crotch side is positioned such that it overlaps with the polymer-free region in a plan view. <12> ~the aforementioned <15> The absorbent article described in any one of the following.

[0070] <17> The shape of the polymer-free region is rectangular, elliptical, or circular, etc. <12> ~the aforementioned <16> The absorbent article described in any one of the following. <18> The absorbent article has only one polymer-free region, <12> ~the aforementioned <17> The absorbent article described in any one of the following. <19> The absorbent article has two or more polymer-free regions, <12> ~the aforementioned <17> The absorbent article described in any one of the following. <20> The aforementioned disposal tape has a fixing portion, an extendable portion, and a fastening portion fixed to the outer surface of the absorbent article, arranged in this order along the longitudinal direction extending from the ventral side through the crotch area to the dorsal side, and is provided on the outer surface of the absorbent article in a tri-fold state stacked in this order. The fixing portion, in a plan view, overlaps with some of the polymer-free regions among the plurality of polymer-free regions, <19> Absorbent articles as described above. <21> The aforementioned disposal tape has a fixing portion, an extendable portion, and a fastening portion fixed to the outer surface of the absorbent article, arranged in this order along the longitudinal direction extending from the ventral side through the crotch area to the dorsal side, and is provided on the outer surface of the absorbent article in a tri-fold state stacked in this order. The fixing portion overlaps with all of the polymer-free regions in a plan view, <19> or the above <20> Absorbent articles as described above.

[0071] <22> The absorbent sheet has a structure in which an absorbent polymer is fixed by an adhesive present between two liquid-permeable sheets. <1> ~the aforementioned <21> The absorbent article described in any one of the following. <23> In the absorbent sheet, the absorbent polymer is fixed by an adhesive present between the two liquid-permeable sheets. Even if the absorbent polymer absorbs liquid and swells in the area that overlaps with the waste tape when the absorbent article is viewed from above, the two liquid-permeable sheets are bonded together by the adhesive, <1> ~the aforementioned <22> The absorbent article described in any one of the following. <24> The adhesive in the absorbent sheet is arranged on the surface of each liquid-permeable sheet facing the absorbent polymer. Each of the liquid-permeable sheets has a portion that is directly joined by the adhesive without the absorbent polymer in between, and a portion 29 in which both liquid-permeable sheets are joined by the adhesive via particles of the absorbent polymer. <22> or the above <23> Absorbent articles as described above. <25> The adhesive in the absorbent sheet has the flexibility to stretch in response to the swelling change caused by the absorption of liquid by the absorbent polymer. <22> ~the aforementioned <24> The absorbent article described in any one of the following.

[0072] <26> The adhesive in the absorbent sheet is one or more selected from the group consisting of rubber adhesives, such as acrylic adhesives containing one or more (co)polymers of vinyl monomers including 2-ethylhexyl acrylate, butyl acrylate, ethyl acrylate, cyanoacrylate, vinyl acetate, methyl methacrylate, etc. (such as ethylene vinyl acetate copolymer), silicone adhesives containing polydimethylsiloxane polymer polymers, natural rubber adhesives containing natural rubber, isoprene adhesives containing one or more polyisoprene, chloroprene, etc., styrene-butadiene copolymer (SBR), styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene-butadiene-styrene block copolymer (SEBS), styrene-ethylene-propylene-styrene block copolymer (SEPS), etc. <25> Absorbent articles as described above. <27> The adhesive in the absorbent sheet is arranged on the surface of each liquid-permeable sheet that faces the absorbent polymer. The adhesive provided on one of the liquid-permeable sheets and the adhesive provided on the other liquid-permeable sheet are of the same type. <22> ~the aforementioned <26> The absorbent article described in any one of the following. <28> The adhesive in the absorbent sheet is arranged on the surface of each liquid-permeable sheet that faces the absorbent polymer. The adhesive provided on one of the liquid-permeable sheets and the adhesive provided on the other liquid-permeable sheet are of different types. <22> ~the aforementioned <27> The absorbent article described in any one of the following. <29> The absorbent article has an abdominal portion that is positioned on the wearer's abdominal side when worn, a dorsal portion that is positioned on the wearer's back, and a crotch portion located between the abdominal portion and the dorsal portion. The aforementioned disposal tape has a fixing portion, an extendable portion, and a fastening portion fixed to the outer surface of the absorbent article, arranged in this order along the longitudinal direction extending from the ventral side through the crotch area to the dorsal side, and is provided on the outer surface of the absorbent article in a tri-fold state stacked in this order. The aforementioned folded waste tape has opposing surfaces in the thickness direction that are joined together in a peelable manner. The extension portion is extendable in the vertical direction, <1> ~the aforementioned <28> The absorbent article described in any one of the following. [Explanation of Symbols]

[0073] 1 diaper 2 Absorbent body 21 Surface sheet 22 Back sheet 3 Absorbent 31 Upper absorber 32 Lower absorber 33 Core Wrap Sheet 4A Ventral outer casing 4B Dorsal outer casing 41 Inner layer sheet 42 Outer layer sheet 43 Elastic members 10 Disposal Tape X vertical direction Y (horizontal direction)

Claims

1. An absorbent article comprising an absorbent body having an absorbent material, and having a disposal tape provided on the non-skin-facing side, The absorbent article comprises an abdominal portion positioned on the wearer's abdominal side and a dorsal portion positioned on the wearer's back side when worn. The absorbent body includes an upper absorbent layer and a lower absorbent layer disposed on the non-skin-facing side of the upper absorbent layer. The lower absorbent layer consists of absorbent sheets having a structure in which an absorbent polymer is sandwiched between two identical or different liquid-permeable sheets, and the absorbent polymer is fixed by joining the two liquid-permeable sheets together. The lower absorbent has an extended portion that extends from the back-side edge of the upper absorbent, The lower absorbent has at least a polymer-free region in the extended portion where the absorbent polymer is not present. The aforementioned waste tape is positioned in a location that overlaps with the polymer-free region in a plan view of the absorbent article. An absorbent article in which the members from the waste tape to the absorbent material to the liquid permeable sheet on the skin-facing side of the absorbent material are integrated in the thickness direction region from the waste tape to the absorbent material.

2. The absorbent article according to claim 1, wherein the waste tape is positioned so as not to overlap with the upper absorbent layer in a plan view of the absorbent article.

3. In the absorbent sheet, the absorbent polymer is fixed by an adhesive present between the two liquid-permeable sheets. The absorbent article according to claim 1 or 2, wherein even if the absorbent polymer absorbs liquid and swells in the area that overlaps with the waste tape when the absorbent article is viewed from above, the two liquid-permeable sheets are bonded together by the adhesive.

4. The absorbent article has a crotch area located between the ventral and dorsal portions, The aforementioned disposal tape has a fixing portion, an extendable portion, and a fastening portion fixed to the outer surface of the absorbent article, arranged in this order along the longitudinal direction extending from the ventral side through the crotch area to the dorsal side, and is provided on the outer surface of the absorbent article in a tri-fold state stacked in this order. The aforementioned folded waste tape has opposing surfaces in the thickness direction that are joined together in a peelable manner. The absorbent article according to claim 1 or 2, wherein the extension portion is extendable in the longitudinal direction.

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