Shorts-type absorbent article

Abstract

In the short pants-type absorbent article (1), the outer cover member (20, 30) has an extension portion (30E) extending downward from at least one of a pair of waist portions (1F, 1B), the extension portion (30E) has a cord-like transverse elastic member (35) stretchable in the left-right direction and an oblique elastic member (36) stretchable in a direction inclined with respect to the left-right direction, and in a state in which the short pants-type absorbent article (1) is spread out, in a portion of the absorbent core (121) overlapping the extension portion (30E), a plurality of low-basis-weight regions (40) are formed as regions in which the basis weight of the absorbent core (121) is lower than the basis weight of the surrounding regions and extends in at least one of the up-down direction and the left-right direction.

Description

TECHNICAL FIELD

[0001] The present application relates to a pant-type absorbent article. BACKGROUND

[0002] Patent Literature 1 discloses a pant-type absorbent article including an absorbent main body, a belly-side waist member, and a back-side waist member, in which the belly-side waist member and the back-side waist member are joined by a pair of joining portions on both left and right side portions. The back-side waist portion has an extension portion extending downward beyond the joining portions, which can cover the buttocks of the wearer. Further, the extension portion includes an oblique elastic member disposed at the side end portion in the left-right direction obliquely with respect to the left-right direction and a transverse elastic member disposed along the left-right direction. Therefore, the extension portion is easily maintained in a state of fitting along the contour of the buttocks of the wearer without rolling or positional deviation.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent Application Laid-Open No. 2019-30551 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] As described above, although the fit of the extension portion is enhanced by providing the elastic member in the extension portion, the absorbent core is irregularly deformed (shrinks) due to the elastic member of the extension portion, resulting in a risk of a gap being formed between the wearer and the absorbent core and thus a leakage of excrement. In particular, since the extension portion is located on the crotch side with respect to the waist portion, the proportion of the area overlapping with the absorbent core increases. That is, the elastic member provided in the extension portion easily affects the shrinkage of the absorbent core.

[0008] The present application has been achieved in view of the above-described problems, and an object of the present application is to enhance the fit of the extension portion and the absorbent core to the wearer while suppressing irregular deformation of the absorbent core due to the elastic member provided in the extension portion.

[0009] SOLUTION TO THE PROBLEM

[0010] The main aspect of the present application for achieving the above object is a pant-type absorbent article having an up-down direction, a left-right direction, and a front-rear direction, the absorbent article including: an absorbent main body including an absorbent core; and an outer cover member disposed on a non-skin side with respect to the absorbent main body; both side portions in the left-right direction of each of a pair of waist portions in the outer cover member are joined by a pair of joining portions; the outer cover member has an extension portion, which is a portion extending downward from at least either of the pair of waist portions, the extension portion having a string-like transverse elastic member, which stretches and contracts in the left-right direction, and an oblique elastic member, which stretches and contracts in an oblique direction inclined with respect to the left-right direction; and a plurality of low-basis-weight regions are provided in a portion of the absorbent core overlapping with the extension portion when the pant-type absorbent article is in an unfolded state, the low-basis-weight region being a region of the absorbent core in which a basis weight is lower than that of a surrounding region and which extends in at least either of the up-down direction and the left-right direction.

[0011] Other features of the present application will become apparent from a reading of the description.

[0012] Effects of the Invention

[0013] According to the present application, the fit of the extension portion and the absorbent core to the wearer can be enhanced while irregular deformation of the absorbent core due to the elastic members provided in the extension portion is suppressed. BRIEF DESCRIPTION OF DRAWINGS

[0014] [ Figure 1 ] Figure 1 is a front view of a pant-type disposable diaper 1.

[0015] [ Figure 2 ] Figure 2 is a schematic plan view of the diaper 1 in an unfolded and stretched state when viewed from the skin side.

[0016] [ Figure 3 ] Figure 3 is a schematic cross-sectional view taken along line A-A in Figure 2 .

[0017] [ Figure 4 ] Figure 4 is an explanatory diagram showing a low-basis-weight region 40 of the absorbent core 12.

[0018] [ Figure 5 ] Figure 5 is an explanatory diagram showing a low-basis-weight region 40 of the absorbent core 12.

[0019] [ Figure 6 ] Figure 6 A and Figure 6 B are explanatory diagrams showing the absorbent core 12.

[0020] [ Figure 7 ] Figure 7 is an explanatory view showing a diaper 1 of a modification example.

[0021] [ Figure 8 ] Figure 8 is an explanatory view showing a diaper 1 of a second embodiment.

[0022] [ Figure 9 ] Figure 9 is an explanatory view showing a diaper 1 of a third embodiment.

[0023] [ Figure 10 ] Figure 10 A is a schematic front view of the diaper 1 of the third embodiment in a natural state, Figure 10 B is a schematic front view of the diaper 1 of the third embodiment in a worn state. DETAILED DESCRIPTION

[0024] At least the following matters will become clear through the description of the present specification and the attached drawings.

[0025] A pant-type absorbent article having an up-down direction, a left-right direction, and a front-rear direction, the absorbent article including: an absorbent main body including an absorbent core; and an outer cover member disposed on a non-skin side with respect to the absorbent main body; both side portions in the left-right direction of each of a pair of waist portions in the outer cover member are joined by a pair of joining portions; the outer cover member has an extension portion, which is a portion extending downward from at least either of the pair of waist portions, the extension portion having a string-like transverse elastic member, which stretches and contracts in the left-right direction, and an oblique elastic member, which stretches and contracts in an oblique direction inclined with respect to the left-right direction; a plurality of low-basis-weight regions, which are regions of the absorbent core having a lower basis weight than surrounding regions and extending in at least either of the up-down direction and the left-right direction, are provided in a portion of the absorbent core overlapping with the extension portion when the pant-type absorbent article is in an unfolded state.

[0026] According to the pant-type absorbent article described above, the low-basis-weight regions can be contracted by the transverse elastic member and the oblique elastic member, so that irregular deformation of the absorbent core (for example, deformation in which the absorbent core protrudes toward the non-skin side) can be suppressed. Further, when the contracted absorbent core is expanded due to the transverse elastic member and the oblique elastic member when the absorbent article is worn, the absorbent core (low-basis-weight regions) can be brought into close contact with the wearer's body. Thus, the extension portion and the absorbent core can be enhanced in fit to the wearer.

[0027] In such a pant-type absorbent article, the transverse elastic member and the oblique elastic member are separate members, and have an overlapping portion in which the transverse elastic member and the oblique elastic member partially overlap in the front-rear direction.

[0028] According to the above-described pant-type absorbent article, the transverse elastic member is easily stretched in conjunction with the stretching of the oblique elastic member. Thus, the absorbent core (low basis weight region) can reliably expand in the left-right direction and closely contact the wearer's body.

[0029] In such a pant-type absorbent article, the total value of the force for stretching the oblique elastic member of the extension portion in the oblique direction by a predetermined length is greater than the total value of the force for stretching the transverse elastic member of the extension portion in the left-right direction by a predetermined length.

[0030] According to the above-described pant-type absorbent article, the transverse elastic member is easily stretched in conjunction with the stretching of the oblique elastic member having a high tensile stress. Thus, the absorbent core (low basis weight region) can reliably expand in the left-right direction and closely contact the wearer's body.

[0031] In such a pant-type absorbent article, the outer cover member has the extension portion extending downward from the rear waist portion.

[0032] According to the above-described pant-type absorbent article, the wearer's round buttocks can be covered with the extension portion, and the extension portion can be brought into close contact with the absorbent core along the buttocks that move greatly.

[0033] In such a pant-type absorbent article, one side portion of the outer cover member on one side in the front-rear direction has the extension portion, the other side portion of the outer cover member on the other side in the front-rear direction has a rectangular shape in a stretched state; the absorbent main body has an exposed portion on the lower side of the one side portion of the outer cover member in the front-rear direction and on the lower side of the other side portion of the outer cover member in the front-rear direction, the exposed portion has a non-skin side surface exposed to the outside, and a plurality of low basis weight regions are provided in a portion of the exposed portion of the absorbent core when the pant-type absorbent article is in an unfolded state; the low basis weight region is a region of the absorbent core in which the basis weight is lower than that of the surrounding region and extends in at least either one of the up-down direction and the left-right direction.

[0034] According to the above-described pant-type absorbent article, the portion of the absorbent core in the exposed portion is easily bent along the crotch portion of the wearer due to the low basis weight region without being hindered by the outer cover member. This makes it possible to suppress leakage of excreted liquid.

[0035] In such a pant-type absorbent article, the extension portion has a plurality of the transverse elastic members arranged side by side in the up-and-down direction, and the low-basis-weight region has an elongated region that is longer in the up-and-down direction than in the left-and-right direction, and in a laid-out state of the pant-type absorbent article, a position in the up-and-down direction of the elongated region overlaps positions in the up-and-down direction of two or more of the transverse elastic members.

[0036] According to the above-described pant-type absorbent article, the portion of the absorbent core that overlaps the extension portion is easily regularly contracted in a wide range in the up-and-down direction, and is easily in close contact with the wearer's body in a state of being expanded in the left-and-right direction.

[0037] In such a pant-type absorbent article, the extension portion has a plurality of the transverse elastic members arranged side by side in the up-and-down direction, and the lower end of the oblique elastic member is positioned on the lower side of the lowest transverse elastic member.

[0038] According to the above-described pant-type absorbent article, it makes all of the plurality of transverse elastic members easily stretch in conjunction with the stretching of the oblique elastic member, so that the absorbent core (low-basis-weight region) can reliably be expanded in the left-and-right direction and be in close contact with the wearer's body.

[0039] In such a pant-type absorbent article, the low-basis-weight region has an elongated region that is longer in the up-and-down direction than in the left-and-right direction, and a transverse region that is longer in the left-and-right direction than in the up-and-down direction, and the elongated region and the transverse region are arranged crossing each other.

[0040] According to the above-described pant-type absorbent article, the absorbent core is easily bent in each direction from the intersection of the elongated region and the transverse region, so that the absorbent core is easily bent along the wearer's body.

[0041] In such a pant-type absorbent article, the basis weight of an absorbent body including the absorbent core is 400 g / m 2 or more.

[0042] According to the above-described pant-type absorbent article, the absorbent capacity is high, and the low-basis-weight region can prevent the absorbent core from becoming stiff. This makes it possible to reduce the sense of discomfort when the absorbent article is worn.

[0043] In such a pant-type absorbent article, the low-basis-weight region has a plurality of longitudinal regions that are longer in the up-and-down direction than in the left-and-right direction; the plurality of longitudinal regions are arranged side by side with intervals in the left-and-right direction, the absorbent core has a plurality of compressed portions in which a portion of the absorbent core is compressed in the thickness direction, and in a stretched state of the pant-type absorbent article, an average length of the compressed portions in the left-and-right direction is smaller than an average interval between the longitudinal regions arranged side by side in the left-and-right direction.

[0044] According to the above-described pant-type absorbent article, it reduces the possibility that a compressed portion is located at a boundary portion between a low-basis-weight region (a longitudinal region) and a high-basis-weight region adjacent thereto. Therefore, the low-basis-weight region and the high-basis-weight region are difficult to be integrated. This allows the low-basis-weight region to be contracted by the elastic member, so that irregular deformation of the absorbent core can be suppressed.

[0045] In such a pant-type absorbent article, the outer member has a waist elastic member that stretches and contracts in the left-and-right direction in the waist portion, and a plurality of low-basis-weight regions are provided in a portion of the absorbent core that overlaps with the waist portion when the pant-type absorbent article is in an unfolded state, the low-basis-weight regions being regions of the absorbent core in which the basis weight is lower than that of surrounding regions and extends in at least either one of the up-and-down direction and the left-and-right direction.

[0046] According to the above-described pant-type absorbent article, irregular deformation of a portion of the absorbent core that is positioned in the waist portion can be suppressed. Furthermore, when the absorbent article is worn, when the contracted absorbent core (low-basis-weight region) expands in the left-and-right direction due to the waist elastic member, the absorbent core is allowed to be in close contact with the wearer's body.

[0047] In such a pant-type absorbent article, a total area of the low-basis-weight regions in the portion of the absorbent core that overlaps with the waist portion is smaller than a total area of the low-basis-weight regions in the portion of the absorbent core that overlaps with the extension portion when the pant-type absorbent article is in an unfolded and stretched state.

[0048] According to the above-described pant-type absorbent article, the absorbent core is easily bent along the hip and lower abdomen of the waist circle, and the fit of the absorbent core is enhanced.

[0049] In such a pant-type absorbent article, the low-basis-weight region has a transverse region that is longer in the left-and-right direction than in the up-and-down direction, and the transverse region is located in a portion of the absorbent core that overlaps with the waist portion on the back side when the pant-type absorbent article is in an unfolded state.

[0050] According to the above-described short pants-type absorbent article, the absorbent core is easily bent in the up-and-down direction along the up-and-down direction profile of the wearer's body (from the waist portion to the crotch portion), and the fit of the absorbent core is enhanced.

[0051] In such a short pants-type absorbent article, the low-basis-weight region has a long region in the left-and-right direction that is longer in the left-and-right direction than in the up-and-down direction, and a plurality of the long regions are juxtaposed in the up-and-down direction in a portion of the absorbent core that overlaps the waist portion on the front side when the short pants-type absorbent article is in the unfolded state.

[0052] According to the above-described short pants-type absorbent article, the absorbent core is easily bent in the up-and-down direction along the up-and-down direction profile of the wearer's body (from the waist portion to the crotch portion), and the fit of the absorbent core is enhanced.

[0053] In such a short pants-type absorbent article, the absorbent main body has an exposed portion on the lower side of the front side portion of the outer cover member and on the lower side of the back side portion of the outer cover member, the exposed portion has a non-skin side that is exposed to the outside, and the low-basis-weight region is provided so as to straddle the lower end of at least either the front side portion of the outer cover member or the back side portion of the outer cover member in the up-and-down direction.

[0054] According to the above-described short pants-type absorbent article, at the boundary portion between the portion of the absorbent core that is covered with the outer cover member and the portion of the absorbent core that is not covered with the outer cover member and that is easily bent, the bending of the absorbent core can be inhibited from changing sharply, and the bending can be moderated.

[0055] == Embodiments ==

[0056] The short pants-type absorbent article according to the present embodiment will be described below by way of example of a short pants-type disposable diaper for adults. However, the short pants-type absorbent article according to the present embodiment is not limited to the above, but is also applicable to a short pants-type disposable diaper for infants and young children, a short pants-type sanitary napkin, and the like.

[0057] == First Embodiment ==

[0058] <<Basic Configuration of Short Pants-Type Disposable Diaper 1>>

[0059] Figure 1 is a front view of a short pants-type disposable diaper 1 (hereinafter, also referred to as "diaper 1"). Figure 2 is a schematic plan view of the diaper 1 as viewed from the skin side in an unfolded and stretched state. Figure 3 is a schematic cross-sectional view taken along the Figure 2 center line A-A.

[0060] The stretched state of the diaper 1 refers to a state in which the elastic members included in the diaper 1 are stretched to a state in which the wrinkles in the diaper 1 are no longer visible. Specifically, the diaper 1 is stretched until the dimensions of the members constituting the diaper 1 coincide with or approximate the dimensions thereof in the state in which the elastic members do not exhibit stretchability.

[0061] As shown in Figure 1 , the diaper 1 has an upper-lower direction, a left-right direction, and a front-rear direction, and the diaper 1 has a waist opening BH and a pair of leg opening LH. In the front-rear direction, the side corresponding to the abdominal side of the wearer is the front side, and the side corresponding to the back side of the wearer is the rear side. Further, the diaper 1 has a thickness direction as shown in Figure 3 . With respect to the thickness direction, the side in contact with the wearer is the skin side, and the side opposite to the skin side is the non-skin side.

[0062] The diaper 1 has an absorbent main body 10, and outer cover members 20 and 30 arranged on the non-skin side with respect to the absorbent main body 10. The diaper 1 of the present embodiment is a so-called three-piece type, and the outer cover members have a front side outer cover member 20 and a rear side outer cover member 30. The absorbent main body 10 has an exposed portion 10E in which the non-skin side surface is exposed to the outside, on the lower side of the front side outer cover member 20 (front side portion of the outer cover member) and on the lower side of the rear side outer cover member 30 (rear side portion of the outer cover member).

[0063] As shown in Figure 2 , the non-skin side surface of the longitudinal front end portion of the absorbent main body 10 is joined to the skin side surface of the front side outer cover member 20 with an adhesive or the like, and the non-skin side surface of the longitudinal rear end portion of the absorbent main body 10 is joined to the skin side surface of the rear side outer cover member 30 with an adhesive or the like. From the diaper 1 in the stretched state, Figure 2 , the absorbent main body 10 is folded in half so that the front side outer cover member 20 and the rear side outer cover member 30 face each other, and the left and right side portions of the front side outer cover member 20 and the left and right side portions of the rear side outer cover member 30 are joined by fusion (e.g., heat fusion or ultrasonic fusion) to form a pair of joint portions 2. Thereby, the diaper 1 in the short pants type state is obtained.

[0064] In the present embodiment, in the diaper 1, the region located in the range of the upper-lower direction in which the joint portions 2 extend (i.e., the region from the position of the upper end 2a to the position of the lower end 2b of the joint portions 2) is referred to as "a pair of waist portions 1F and 1B". The waist portion located on the front side in the front-rear direction will be referred to as "front side waist portion 1F", and the waist portion located on the rear side will be referred to as "rear side waist portion 1B".

[0065] The absorbent main body 10 includes a liquid-permeable front sheet 11, an absorbent body 12 that absorbs excretions, a liquid-impermeable back sheet 13, and an outer wrapping sheet 14. These are joined with an adhesive or the like. The absorbent body 12 includes an absorbent core 121 and a liquid-permeable core wrap sheet 122 (tissue paper, nonwoven fabric, or the like) that covers the absorbent core 121. One example of the absorbent core 121 is an absorbent core obtained by forming liquid-absorbing fibers (e.g., pulp fibers) containing a highly absorbent polymer into a predetermined shape. Alternatively, the absorbent core 121 can be an SAP sheet in which an SAP layer is attached to a hydrophilic sheet, an air-laid sheet in which liquid-absorbing fibers are formed into a sheet by an air-laid method, or the like. Note that the absorbent body 12 does not necessarily include the core wrap sheet 122.

[0066] Further, the absorbent main body 10 has a leakage-preventing wall portion 15 that can stand toward the skin side in both the left and right direction sides. For example, the leakage-preventing wall portion 15 is formed by folding the left and right direction sides of the outer wrapping sheet 14 inward in the left and right direction sides in a manner positioned on the skin side of the front sheet 11, and providing a leakage-preventing wall elastic member 151 (e.g., an elastic string) that stretches in the longitudinal direction at the folded portions.

[0067] As shown in FIG. 1, the diaper 1 includes a front side outer member 20, a back side outer member 30, and an absorbent main body 10 that is interposed between the front side outer member 20 and the back side outer member 30. The front side outer member 20 and the back side outer member 30 are joined to each other at a crotch portion 1C, and are configured to be worn around the waist of a wearer. Figure 3 As shown in FIG. 1, the diaper 1 includes a front side outer member 20, a back side outer member 30, and an absorbent main body 10 that is interposed between the front side outer member 20 and the back side outer member 30. The front side outer member 20 and the back side outer member 30 are joined to each other at a crotch portion 1C, and are configured to be worn around the waist of a wearer.

[0068] As shown in FIG. 1, the diaper 1 includes a front side outer member 20, a back side outer member 30, and an absorbent main body 10 that is interposed between the front side outer member 20 and the back side outer member 30. The front side outer member 20 and the back side outer member 30 are joined to each other at a crotch portion 1C, and are configured to be worn around the waist of a wearer. Figure 2 As shown in FIG. 1, the diaper 1 includes a front side outer member 20, a back side outer member 30, and an absorbent main body 10 that is interposed between the front side outer member 20 and the back side outer member 30. The front side outer member 20 and the back side outer member 30 are joined to each other at a crotch portion 1C, and are configured to be worn around the waist of a wearer.

[0069] While the basic configuration of the diaper 1 has been described above, the configuration of the diaper 1 is not limited to the above. For example, the diaper 1 can be a two-piece diaper, i.e., the front side outer member 20 and the back side outer member 30 can be constituted by a single continuous member, or a crotch outer member that connects the front side outer member 20 and the back side outer member 30 can be provided (see the later-described Figure 7). Furthermore, the shape of the extension portion (30E) extending downward from the back waist portion (in this case, the back waist portion 1B) is not limited to a substantially trapezoidal shape, but can be, for example, a rectangular shape (see FIG. 6 described later Figure 9 ) and the like.

[0070] <<Low-basis-weight region 40 of absorbent core 12>>

[0071] Figure 4 and Figure 5 is an explanatory view that explains the low-basis-weight region 40 of the absorbent core 12. Figure 4 is a schematic plan view of the back outer cover member 30 in an unfolded and stretched state. Figure 5 is a schematic plan view of the diaper 1 in an unfolded and stretched state. Figure 6 A and Figure 6 B is an explanatory view that shows the absorbent core 12. Figure 7 is an explanatory view that shows a modification example of the diaper 1, and is a schematic plan view of the diaper 1 in an unfolded and stretched state.

[0072] The back outer cover member 30 that constitutes the diaper 1 has an extension portion 30E that extends downward from the back waist portion 1B. The extension portion 30E can cover the buttocks of the wearer. Furthermore, the extension portion 30E has a lateral elastic member 35 that stretches in the left-right direction of the diaper 1, and an oblique elastic member 36 that stretches in a direction inclined with respect to the left-right direction. The lateral elastic member 35 and the oblique elastic member 36 are string-like elastic members made of rubber, spandex, or the like.

[0073] In a stretched state in the left-right direction, the lateral elastic member 35 is fixed between the skin-side sheet 31 and the non-skin-side sheet 32 that constitute the back outer cover member 30, with an adhesive or the like. Thus, in the stretched state of the diaper 1, Figure 4 ), the lateral elastic member 35 that extends in the left-right direction is provided in the extension portion 30E. Furthermore, the extension portion 30E is provided with three lateral elastic members 35 that are arranged in parallel with a gap in the up-down direction. However, the number of the lateral elastic members 35 can be one or a plurality other than three.

[0074] The oblique elastic member 36 is provided so as to extend along the outer edge of the extension portion 30E having a substantially trapezoidal shape. Thus, the oblique elastic member 36 has an oblique portion 361 that extends in a direction inclined downward and inward in the left-right direction (hereinafter, also referred to as "inclined direction"), and a horizontal portion 362 that extends in the left-right direction. The oblique portion 361 is fixed between the skin-side sheet 31 and the non-skin-side sheet 32 with an adhesive or the like in a stretched state in the inclined direction. The horizontal portion 362 is fixed between the skin-side sheet 31 and the non-skin-side sheet 32 with an adhesive or the like in a stretched state in the left-right direction. Thus, in the stretched state of the diaper 1, Figure 4), the inclined portion 361 is located in the extension portion 30E in a state of extending along the inclined direction, and the horizontal portion 362 is located in the extension portion 30E in a state of extending along the left-right direction. Further, the extension portion 30E is provided with three inclined elastic members 36 arranged side by side with intervals in a direction orthogonal to the stretching direction. However, the number of the inclined elastic members 36 can be one or more than three. Further, the inclined elastic members 36 do not necessarily have the horizontal portion 362 (see, for example Figure 7 ).

[0075] By the transverse elastic member 35 and the inclined elastic member 36, the extension portion 30E is brought into close contact with the wearer's hip, which can suppress the position deviation and the roll of the extension portion 30E. In particular, the inclined elastic member 36 is provided to extend along the outer edge of the extension portion 30E, and thus the outer edge portion of the extension portion 30E is fitted along the contour of the hip, so that it is easy to maintain the state in which the extension portion 30E wraps the hip. Note that the inclined elastic member 36 is not limited to a string-like elastic member, but can be a sheet-like elastic member such as a stretchable nonwoven fabric or a stretchable film. This can make it difficult to leave a trace of the elastic member along the hip contour.

[0076] Further, as shown in Figure 6 A, the absorbent core 121 has a plurality of low basis weight regions 40 in which the basis weight of the absorbent core 121 is lower than the basis weight of the surrounding regions and extends along at least either one of the up-down direction and the left-right direction. The basis weight of the absorbent core 121 is the mass per unit area (g / m 2 ) of the absorbent core 121 (for example, liquid-absorbing fibrous material containing SAP). Further, the regions other than the low basis weight regions 40 in the absorbent core 121 will be referred to as high basis weight regions 43.

[0077] The low basis weight regions 40 can be groove regions in which the absorbent core 121 is recessed in the thickness direction, or can be holes (slits) that penetrate the absorbent core in the thickness direction, or can be regions that are not recessed in the thickness direction but have a lower density than the surrounding regions. The basis weight of the absorbent core 12 can be compared between the low basis weight regions 40 and the surrounding regions (high basis weight regions 43) by a known method. One example is a visual comparison method. In another method, a target portion is cut out from the absorbent core 121 as a sample, the mass and the area of each sample are measured, and the basis weight is calculated.

[0078] As shown in Figure 6As illustrated in A, the absorbent core 121 of the present embodiment is provided with a plurality of low-basis-weight regions 40 extending in the up-down direction and the left-right direction. Specifically, the low-basis-weight regions 40 have elongated regions 41 that are longer in the up-down direction than in the left-right direction, and transverse regions 42 that are longer in the left-right direction than in the up-down direction. The up-down direction length of the elongated regions 41 is greater than the left-right direction length of the transverse regions 42. With respect to one elongated region 41, a plurality of transverse regions 42 are arranged in parallel with spacing in the up-down direction. Furthermore, the transverse regions 42 intersect the elongated regions 41 or extend from the side ends of the elongated regions 41 toward one side in the left-right direction. In the absorbent core 12, the plurality of low-basis-weight regions 40 are arranged in parallel with spacing in the up-down direction, and also in the left-right direction.

[0079] Due to the difference in rigidity between the low-basis-weight regions 40 and the surrounding regions, the absorbent core 121 can bend with the low-basis-weight regions 40 as a starting point. That is, the absorbent core 121 can bend in the left-right direction along the elongated regions 41 that are long in the up-down direction, or can bend in the longitudinal direction (up-down direction) along the transverse regions 42. Thus, the absorbent core 121 can bend along the wearer's body, so that the fit of the absorbent core 121 to the wearer is good.

[0080] Note that the transverse regions 42 arranged in parallel in the left-right direction are not continuous, but are arranged with spacing in the left-right direction. Therefore, it is preferable to align the up-down direction positions of the transverse regions 42 arranged in parallel in the left-right direction. This makes it easy for the absorbent core 121 to bend in the longitudinal direction (up-down direction) along the transverse regions 42.

[0081] Furthermore, the provision of the low-basis-weight regions 40 in the absorbent core 121 allows the excreted liquid absorbed by the absorbent core 121 to spread in the up-down direction and the left-right direction along the low-basis-weight regions 40. Therefore, the excreted liquid is absorbed and held in a large area on the plane of the absorbent core 121, so that it is possible to enhance the absorbency of the absorbent core 121.

[0082] Furthermore, the diaper 1 has an extension 30E that extends downward from the back waist portion 1B, and it is preferable that, as illustrated in Figure 4 or Figure 5 illustrated, when the diaper 1 is in the unfolded state, the plurality of low-basis-weight regions 40 are provided in the portion of the absorbent core 121 that overlaps the extension 30E.

[0083] In the extension portion 30E, a transverse elastic member 35 and an oblique elastic member 36 (hereinafter, collectively referred to as "elastic members 35 and 36") are provided. Therefore, in the case where the low basis weight region 40 is not provided in the portion of the absorbent core 121 overlapping with the extension portion 30E, there is a risk that the absorbent core 121 is irregularly deformed due to the contraction force of the elastic members 35 and 36. For example, when a portion of the absorbent core 121 is deformed in a manner of protruding toward the non-skin side, a gap is formed between the absorbent core and the wearer, thereby causing leakage of the excreted liquid. In addition, this makes it easy to notice the diaper being worn through the clothes. In particular, the extension portion 30E is positioned on the crotch side compared with the waist portions 1F and 1B, and thus the proportion (length in the up-down direction) of the region overlapping with the absorbent core 121 is large. That is, the elastic members 35 and 36 provided in the extension portion 30E are more likely to affect the contraction of the absorbent core 121 than the waist elastic members 24 and 34.

[0084] Therefore, the low basis weight region 40 is provided in the portion of the absorbent core 121 overlapping with the extension portion 30E. This makes the low basis weight region 40 of the absorbent core 121 easily contract due to the elastic members 35 and 36. That is, the low basis weight region 40 is easily contracted in the left-right direction due to the transverse elastic member 35, and is easily contracted in the up-down direction due to the oblique elastic member 36 (oblique portion 361). In particular, the low basis weight region 40 is easily contracted in the left-right direction due to the transverse elastic member 35 close to the absorbent core 121. In addition, a plurality of low basis weight regions 40 (longitudinal regions 41) are arranged in parallel in the left-right direction, and a plurality of low basis weight regions 40 (transverse regions 42) are arranged in parallel in the up-down direction. Therefore, not only the portion of the absorbent core 121 overlapping with the extension portion 30E is contracted, but also the absorbent core 121 is easily regularly contracted in the left-right direction and the up-down direction in a wide range of the planar direction. Therefore, in the natural state (non-stretched state) of the diaper 1 before the diaper is worn, it is possible to prevent an unintended wrinkle from being formed in the absorbent core 121 due to the elastic members 35 and 36. In addition, even in the state where the diaper 1 is worn, it is possible to suppress irregular deformation (for example, deformation in which the absorbent core protrudes toward the non-skin side) of the absorbent core 121 due to the elastic members 35 and 36, so that it is difficult to form a gap between the wearer and the absorbent core 121, thereby enhancing the fit of the absorbent core 121 to the wearer.

[0085] Further, when the diaper 1 is worn, in a state where the contracted absorbent core 121 is expanded in the left-right direction due to the lateral elastic member 35 and in the up-down direction due to the inclined portion 361 of the inclined elastic member 36, the absorbent core 121 (low basis weight region 40) can be brought into close contact with the buttocks of the wearer. Further, when the diaper 1 is pulled up to be put on, the inclined elastic member 36 is first stretched, which makes it easy for the lateral elastic member 35 to be stretched in conjunction with the inclined elastic member 36. In particular, the inclined elastic member 36 does not extend in the up-down direction but is inclined upward and to the outside in the left-right direction. Therefore, the lateral elastic member 35 also easily stretches in the left-right direction in conjunction with the stretching of the inclined elastic member 36. Thus, the contracted absorbent core 121 (low basis weight region 40) can be reliably expanded in the left-right direction and brought into close contact with the wearer.

[0086] Further, the provision of the low basis weight region 40 in the absorbent core 121 allows the elastic members 35 and 36 to be reliably contracted in the natural state of the diaper 1 before the diaper is worn. Therefore, compared with a case where the low basis weight region 40 is not provided in the absorbent core 121 and the elastic members 35 and 36 are slightly stretched, the elastic members 35 and 36 can be stretched with a smaller force, and the diaper 1 can be easily put on.

[0087] Further, the lateral elastic member 35 and the inclined elastic member 36 are string-like elastic members. Therefore, compared with a case where the entire absorbent core 121 is contracted due to the provision of stretchable sheets that contract in the left-right direction and the up-down direction in the extension portion 30E, the absorbent core 121 is easily contracted in the predetermined direction (in particular, the left-right direction), making it more difficult for the absorbent core 121 to be irregularly deformed.

[0088] Further, the up-down direction positions of the lateral elastic member 35 and the inclined elastic member 36 can be offset from the up-down direction position of the low basis weight region 40. However, it is preferable that the up-down direction positions of the lateral elastic member 35 and the inclined elastic member 36 overlap the up-down direction position of the low basis weight region 40. This makes it easy for the low basis weight region 40 to be contracted and expanded due to the elastic members 35 and 36.

[0089] Further, in a case where the extension portion 30E has a plurality (in this example, three) of lateral elastic members 35 arranged side by side in the up-down direction, it is preferable that, when the diaper 1 is in the unfolded state, the up-down direction position of the low basis weight region 40 (longitudinal region 41) overlaps the up-down direction positions of two or more of the lateral elastic members 35. In Figure 4In this case, all of the up-and-down direction positions of the three transverse elastic members 35A to 35C overlap with the up-and-down direction positions of the longitudinal regions 41. This makes the low basis weight regions 40 easily contract and expand due to the transverse elastic members 35. In addition, it is possible to make the portions of the absorbent core 121 that overlap with the extension portions 30E regularly contract in a large range in the up-and-down direction.

[0090] Note that the overlap of the up-and-down direction positions of the transverse elastic members 35 with the up-and-down direction positions of the low basis weight regions 40 (the longitudinal regions 41) means that the low basis weight regions 40 and the transverse elastic members 35 can or can not overlap in the thickness direction. For example, in a case where the transverse elastic members 35 are arranged so as to pass through the low basis weight regions 40 in the left-and-right direction, the low basis weight regions 40 and the transverse elastic members 35 can not overlap in the thickness direction. Figure 4 In this case, the transverse elastic members 35 are arranged so as to pass through the low basis weight regions 40 in the left-and-right direction, and the low basis weight regions 40 and the transverse elastic members 35 overlap each other in the thickness direction. In this case, the low basis weight regions 40 easily contract and expand due to the transverse elastic members 35. However, the configuration is not limited to this. The following configuration is also acceptable: in a region where the extension portions 30E and the absorbent main body 10 overlap in the thickness direction, a non-stretchable region (for example, a region where the transverse elastic members 35 are not present or a plurality of positions of the transverse elastic members 35 are cut off) provided with the transverse elastic members 35, the low basis weight regions 40 and the transverse elastic members 35 (a portion that generates stretchability) do not overlap each other in the thickness direction.

[0091] In addition, it is preferable that the transverse elastic members 35 and the oblique elastic members 36 are not continuous single members, but are independent members, respectively, and the transverse elastic members 35 and the oblique elastic members 36 have an overlap portion 300 in which the transverse elastic members and the oblique elastic members partially overlap each other in the front-and-rear direction (the thickness direction). This makes the low basis weight regions 40 easily and reliably contract and expand in the left-and-right direction due to the transverse elastic members 35. In addition, the transverse elastic members 35 easily stretch along the left-and-right direction in conjunction with the stretching of the oblique elastic members 36 from the overlap portion 300 as a starting point. Therefore, the contracted absorbent core 121 (the low basis weight regions 40) can reliably expand in the left-and-right direction and closely contact the wearer.

[0092] Further, it is desirable that the total value of the force (tensile stress) for stretching the inclined portions 361 (three inclined portions 361 in this example) of the inclined elastic members 36 of the extension portion 30E by a predetermined length in the inclined direction be greater than the total value of the force (tensile stress) for stretching the lateral elastic members 35 (three lateral elastic members 35 in this example) of the extension portion 30E by a predetermined length in the left-right direction. This makes the lateral elastic members 35 easily stretch in the left-right direction in conjunction with the strong tensile force of the inclined elastic members 36. Therefore, the contracted absorbent core 121 (low basis weight region 40) can reliably expand in the left-right direction and come into close contact with the wearer. When the elastic members 35 and 36 are fixed to the sheet, the tensile stress of each of the elastic members 35 and 36 can be adjusted by adjusting the thickness and the tensile coefficient of the elastic members 35 and 36. However, the configuration is not limited to the above-described configuration, and the total value of the tensile stress of the lateral elastic members 35 can be equal to or greater than the total value of the tensile stress of the inclined elastic members 36 (inclined portions 361).

[0093] Measuring the tensile stress of each of the elastic members 35 and 36 can be performed by the following method.

[0094] (1) First, for each of the elastic members 35 and 36, a sample is prepared for each of the elastic members 35 and 36 by cutting out the portion of the elastic member fixed to the sheet in the case where the elastic member is stretched in the left-right direction or in the inclined direction, from the diaper 1 when the elastic member is in a relaxed state (non-stretched state). However, in the case where it is difficult to prepare or measure a sample for each of the elastic members 35 and 36, a group of samples of a plurality of elastic members 35 or a plurality of elastic members 36 can be prepared and measured.

[0095] (2) Next, for each sample, both ends of the sample corresponding to the left-right direction or the oblique direction of the diaper 1 are held by the chucks of the tensile testing machine. The distance between the chucks is adjusted so that the sample is in a state where the sample is not slack and is stretched. Then, the distance between the chucks is expanded by the tensile testing machine at a predetermined speed, and the load when the sample has been stretched by a predetermined length is obtained. The load at this time is defined as the tensile stress (unit: N) of each elastic member 35 and 36. Then, the total value of the tensile stress of the lateral elastic member 35 and the total value of the tensile stress of the oblique elastic member 36 are calculated and compared. For example, the distance between the chucks is set to 50 mm, the predetermined speed (stretching speed) is set to 100 mm / min, and the predetermined length (stretching length) is set to 75 mm. That is, it is recommended to obtain the stress when one elastic member 35 or 36 is stretched by 50%, and to calculate and compare the total value of the stress. However, it is recommended to appropriately change the distance between the chucks, the predetermined speed, and the predetermined length according to the sample. For example, it is recommended to make the distance between the chucks smaller than the length of the sample in a stretched state sandwiched between the chucks, thereby preventing the sheet formed of the nonwoven fabric or the like sandwiched between the elastic members 35 and 36 from being broken. Furthermore, in the case where the stretching coefficient of the elastic members 35 and 36 is low, the stretching coefficient at the time of obtaining the tensile stress can be reduced by reducing the predetermined length or the like.

[0096] Furthermore, in the region where the oblique elastic member 36 (the oblique portion 361) is provided, the force (tensile stress) for stretching a region having a unit width in a direction orthogonal to the stretching direction by a predetermined length in the stretching direction is greater than the region where the lateral elastic member 35 is provided. Therefore, it is recommended to adjust the tensile stress of each elastic member 35 and 36 to be arranged in the region having a unit width or to adjust the number of the elastic members 35 and 36. Even in this case, the lateral elastic member 35 is easily stretched in the left-right direction in conjunction with the strong stretching force of the region where the oblique elastic member 36 is provided.

[0097] The tensile stress per unit width in a direction orthogonal to the stretching direction can be measured using a tensile testing machine in the same manner as described above.

[0098] (1) First, for all (three in this example) of the lateral elastic members 35, a sample of the region where the lateral elastic member 35 is provided is prepared by cutting out the portion of the elastic member fixed to the sheet in a state where the elastic member is stretched in the left-right direction from the diaper 1 when the elastic member is in a slack state (non-stretched state). Furthermore, for all (three in this case) of the oblique elastic members 36, a sample of the region where the oblique elastic member 36 is provided is prepared by cutting out the portion of the oblique portion 361 of the elastic member 36 fixed to the sheet in a state where the elastic member 36 is stretched in the oblique direction from the diaper 1 when the elastic member 36 is in a slack state (non-stretched state).

[0099] (2) Next, measure the width of each sample (length in the direction orthogonal to the stretching direction).

[0100] (3) Next, for each sample, both ends are held by the chucks of the tensile testing machine. Then, the distance between the chucks is extended at a predetermined speed, and the load when the sample has been stretched to a predetermined length is obtained. Based on the load and the sample width measured in step (2), the load is converted into a load per unit width, and the converted load is determined as the tensile stress per unit width of the area where the transverse elastic member 35 or the inclined elastic member 36 is provided.

[0101] Note that in Figure 4 When the inclined portions 361 of the inclined elastic member 36 are spaced apart from each other in the left-right direction and multiple samples are prepared, the average value of the measured value (load) of each sample can be used.

[0102] Furthermore, the extension 30E has a plurality of (three in this example) transverse elastic members 35 arranged side by side in the vertical direction. In this case, it is preferable that the lower end 36a of the inclined elastic member 36 (more preferably, the lower end of the inclined portion 361) is located below the lowermost transverse elastic member 35C. This allows all the transverse elastic members 35A to 35C to be easily stretched in the left-right direction in conjunction with the stretching of the inclined elastic member 36. Therefore, the shrinking absorbent core 121 (low basis weight region 40) can reliably expand in the left-right direction and come into close contact with the wearer.

[0103] Furthermore, in the diaper 1 of this embodiment, the rear outer member 30 has an extension 30E, but the front outer member 20 does not have an extension and has a rectangular shape in the stretched state. Therefore, the extension 30E can cover the round buttocks. In addition, although the buttocks may deform due to the wearer's movement, a lateral elastic member 35 and an inclined elastic member 36 are provided in the extension 30E, and a low-base weight region 40 is provided in the portion of the absorbent core 121 that overlaps with the extension 30E. Therefore, the fit of the extension 30E and the absorbent core 121 to the buttocks is maintained. Furthermore, since the front outer member 20 does not have an extension, leg movement during walking, etc., can be prevented from being hindered by the extension located on the front side.

[0104] However, the construction is not limited to the above. A construction in which both the front outer member 20 and the rear outer member 30 have extensions is acceptable. In this case, it is sufficient to provide elastic members 35 and 36 in at least one of the extensions, and to provide a low-weight region 40 in the portion of the absorbent core 121 that overlaps with the extension. Alternatively, only the front outer member 20 may have an extension.

[0105] Further, the diaper 1 of the present embodiment has the exposed portion 10E of the absorbent main body 10 on the lower side of the front side outer cover member 20 and the rear side outer cover member 30. In this case, it is preferable that the portion of the absorbent core 12 located in the exposed portion 10E also be provided with the plurality of low basis weight regions 40 when the diaper 1 is in the unfolded state. This makes the portion of the absorbent core 121 located in the exposed portion 10E easily bend due to the low basis weight regions 40. In particular, in the exposed portion 10E, the bending of the absorbent core 121 is not hindered by the outer cover members 20 and 30. Thus, the absorbent core 121 is easily bent along the crotch portion of the wearer. Therefore, the fit of the portion of the absorbent core 121 that directly receives the discharged liquid to the wearer is enhanced, and leakage of the discharged liquid can be inhibited.

[0106] Further, it is preferable that the low basis weight regions 40 be provided so as to straddle the lower end (the lower end 20a of the front side outer cover member 20 in the front side outer cover member 20 and the rear side outer cover member 30 in the upper and lower directions. In this case, at the boundary between the portion of the absorbent core 121 covered by the outer cover members 20 and 30 and the portion of the absorbent core 121 not covered by the outer cover members 20 and 30 and easily bent, the abrupt change in bending of the absorbent core 121 can be inhibited, and the bending can be moderated. Figure 5

[0107] Further, it is preferable that the low basis weight regions 40 be provided so as to straddle the lower end (the lower end 20a of the front side outer cover member 20 in the front side outer cover member 20 and the rear side outer cover member 30 in the upper and lower directions. In this case, at the boundary between the portion of the absorbent core 121 covered by the outer cover members 20 and 30 and the portion of the absorbent core 121 not covered by the outer cover members 20 and 30 and easily bent, the abrupt change in bending of the absorbent core 121 can be inhibited, and the bending can be moderated.

[0107] Further, it is preferable that the low basis weight regions 40 be provided so as to straddle the lower end (the lower end 20a of the front side outer cover member 20 in the front side outer cover member 20 and the rear side outer cover member 30 in the upper and lower directions. In this case, at the boundary between the portion of the absorbent core 121 covered by the outer cover members 20 and 30 and the portion of the absorbent core 121 not covered by the outer cover members 20 and 30 and easily bent, the abrupt change in bending of the absorbent core 121 can be inhibited, and the bending can be moderated.

[0108] Further, the waist portions 1F and 1B are provided with waist elastic members 24 and 34 that stretch in the left and right directions. Thus, the low basis weight regions 40 are easily contracted due to the waist elastic members 24 and 34, and irregular deformation of the portion of the absorbent core 121 overlapping the waist portions 1F and 1B can be inhibited. Further, when the absorbent core 121 (low basis weight regions 40) expands in the left and right directions due to the waist elastic members 24 and 34, the absorbent core 121 is allowed to come into close contact with the waist of the wearer.

[0109] Further, it is desirable that the total area of the low basis weight regions 40 located in the portion of the absorbent core 121 overlapping the extension portion 30E be greater than the total area of the low basis weight regions 40 located in the portion of the absorbent core 121 overlapping the waist portion on the front and rear direction side (i.e., the front side waist portion 1F or the rear side waist portion 1B) when the diaper 1 is in the unfolded and stretched state. In this case, the portion of the absorbent core 121 that comes into contact with the lower abdomen and the buttocks of the wearer is easily bent, and the fit of the absorbent core 121 to the wearer is enhanced.

[0110] In addition, Figure 4 In the diaper 1 shown, the portion of the absorbent core 121 overlapping with the rear waist portion 1B has six low-basicity regions 40 arranged side-by-side in the left-right direction. Conversely, the portion of the absorbent core 121 overlapping with the extension portion 30E has seven low-basicity regions 40 arranged side-by-side in the left-right direction. Therefore, the area ratio of the low-basicity regions 40 per unit area in the portion of the absorbent core 121 overlapping with the extension portion 30E is greater than the area ratio of the low-basicity regions 40 per unit area in the portion of the absorbent core 121 overlapping with the rear waist portion 1B. In this case, the fit of the portion of the absorbent core 121 overlapping with the extension portion 30E to the wearer is further enhanced.

[0111] Furthermore, preferably, when the diaper 1 is in the unfolded state, at least one transversely elongated region 42 of a low-base weight region 40 is provided in the portion of the absorbent core 121 that overlaps with the rear waist portion 1B, and more preferably, a plurality of ( ) are arranged side by side in the vertical direction in this portion. Figure 4 The absorbent core 121 has two horizontally elongated regions 42. This allows the absorbent core 121 to easily bend vertically (longitudinally) along the vertical contour of the wearer's body (from the waist to the rounded hips). Therefore, it enhances the fit of the absorbent core 121 to the wearer.

[0112] Similarly, preferably, when the diaper 1 is in the unfolded state, at least one transverse region 42 of the low-base weight region 40 is provided in the portion of the absorbent core 121 that overlaps with the front waist portion 1F, and more preferably, a plurality of such regions are provided side by side in the vertical direction. Figure 5 The absorbent core 121 has three horizontally elongated regions 42. This allows the absorbent core 121 to easily bend vertically (longitudinally) along the vertical contour of the wearer's body (from the waist to the rounded lower abdomen). Therefore, it enhances the fit of the absorbent core 121 to the wearer.

[0113] However, the construction is not limited to the above description; it is sufficient to provide a low basis weight region 40 in at least the portion of the absorbent core 121 that overlaps with the extension 30E.

[0114] also, Figure 6 The shape of the low-basicity region 40 shown in Figure A is an example and is not limited thereto. For example, the low-basicity region 40 may have either a longitudinally elongated region 41 or a transversely elongated region 42. Alternatively, the longitudinally elongated region 41 and the transversely elongated region 42 may be configured to be spaced apart from each other without overlapping. However, if the low-basicity region 40 has both a longitudinally elongated region 41 and a transversely elongated region 42, this makes it easy for the absorbent core 121 to bend in both the left-right and up-down directions. Furthermore, the excrement tends to diffuse easily in both the left-right and up-down directions.

[0115] Further, if the longitudinal regions 41 and the transverse regions 42 are arranged so as to cross each other, this makes it possible for the absorbent core 121 to bend in various directions from the crossing portions. This makes it possible for the absorbent core 121 to bend along the wearer's body.

[0116] Further, as Figure 6 As shown in FIG. 1, it is preferable that the low-basis-weight regions 40 be arranged symmetrically in the left-right direction in the absorbent core 121. This makes it possible to uniformly contract the absorbent core 121 (the low-basis-weight regions 40) or diffuse the excreted liquid in the left-right direction.

[0117] Further, the plurality of low-basis-weight regions 40 provided in the absorbent core 121 are discontinuous. Specifically, the plurality of longitudinal regions 41 arranged side by side in the up-down direction are arranged apart in the up-down direction with the high-basis-weight regions 43 extending in the left-right direction provided therebetween. Further, the plurality of transverse regions 42 arranged side by side in the left-right direction are arranged apart in the left-right direction with the high-basis-weight regions 43 extending in the up-down direction provided therebetween. Thus, the appropriate rigidity of the absorbent core 121 can be maintained, and collapse of the shape of the absorbent core 121 can be suppressed. Further, even when a large amount of excreted liquid is excreted, it is possible to absorb and hold the excreted liquid in the high-basis-weight regions 43 while diffusing the excreted liquid in the low-basis-weight regions 40. Thus, leakage of the excreted liquid can be suppressed.

[0118] Further, at the longitudinal rear end portion of the absorbent core 121, a high-basis-weight region 43 that is continuous in the left-right direction is provided between the one side end and the other side end of the absorbent core 121. Thus, due to the difference in rigidity between the high-basis-weight region 43 that is continuous in the left-right direction and the surrounding regions, the rear end portion of the absorbent core 121 is easily bent in the longitudinal direction. Thus, the absorbent core 121 is easily bent in the longitudinal direction along the up-down direction contour of the wearer's body (from the waist to the rounded hips).

[0119] Further, since the diaper 1 is provided for adults, it is preferable that the basis weight of the absorbent body 12 including the absorbent core 121 be 400 g / m 2 The above and the absorbent capacity are high. However, in the case where the basis weight of the absorbent body 12 is high, the rigidity increases, and the absorbent body 12 easily becomes stiff. However, since the absorbent body 12 (the absorbent core 121) of the present embodiment has the low-basis-weight regions 40, the absorbent body 12 easily bends along the wearer's body, making it possible to alleviate the sense of discomfort during wearing of the diaper.

[0120] The basis weight of the absorbent body 12 can be measured by a well-known method. For example, a method is provided in which the absorbent body 12 is separated from the diaper 1, and the mass (g) of the absorbent body 12 and the planar area (m 2). Note that, in the case where the absorbent body 12 has the core wrap sheet 122, the total mass of the absorbent core 121 and the core wrap sheet 122 is measured, and the planar area of the core wrap sheet 122 is measured. Further, in the case where the absorbent body 12 has the core wrap sheet 122, the total mass of the absorbent core 121 and the core wrap sheet 122 is measured, and the planar area of the core wrap sheet 122 is measured. Further, in the case where the absorbent body 12 has the core wrap sheet 122, the total mass of the absorbent core 121 and the core wrap sheet 122 is measured, and the planar area of the core wrap sheet 122 is measured. Figure 6 A and Figure 6 In the absorbent body 12 shown in

[0121] Further, the absorbent core 121 can have a plurality of compressed portions 123 in which a portion of the absorbent core 121 is compressed in the thickness direction. In Figure 6 In B, a plurality of small circular compressed portions 123 are arranged side by side in the up-down direction and the left-right direction, and the compressed portions 123 are obtained by compressing the absorbent core 121 and the core wrap sheet 122. The compressed portions 123 make it possible to suppress collapse of the shape of the absorbent core 121 and the like. In the compressed portions 123, the thickness of the absorbent core 121 is thinner than the surrounding area (is a recessed portion), and the density of the liquid-absorbent fibers that constitute the absorbent core 121 is high.

[0122] Further, as shown in Figure 6 A, in the absorbent core 121, a plurality of longitudinal regions 41 (low-basis-weight regions 40) are arranged side by side with intervals in the left-right direction. In this case, it is preferable that, in the stretched state of the diaper 1, the average length d (diameter) of the compressed portions 123 in the left-right direction be smaller than the average interval W between the longitudinal regions 42 arranged side by side in the left-right direction.

[0123] This increases the probability that the compressed portions 123 are placed in the high-basis-weight regions 43 located between the longitudinal regions 41. It also reduces the probability that the compressed portions 123 are placed at the boundary portions between the longitudinal regions 41 (low-basis-weight regions 40) and the high-basis-weight regions 43. Thus, it is possible to suppress the absorbent core 121 from becoming difficult to contract due to the longitudinal regions 41 and the high-basis-weight regions 43 being integrated by the compressed portions 123 positioned at the boundary portions. This allows the absorbent core 121 (longitudinal regions 41) to contract regularly by the elastic members 35 and 36.

[0124] Further, as in the diaper 1 of the modification example shown in Figure 7 It is acceptable for the absorbent core 121 to have a two-layer structure configuration composed of an upper layer core 121A and a lower layer core 121B arranged on the non-skin side in the thickness direction with respect to the upper layer core 121A. In this case, the absorbency of the diaper 1 is enhanced. Even in this case, it is preferable that the transverse elastic member 35 and the oblique elastic member 36 be provided in the waist portion 1F and 1B Figure 7The low-basis-weight region 40 is preferably provided in the portion of the absorbent core 121 that overlaps with the extension 30E. This makes it possible to contract the low-basis-weight region 40 by the elastic members 35 and 36, making it possible to suppress irregular deformation of the absorbent core 121. Furthermore, the contracted absorbent core 121 (low-basis-weight region 40) can expand and come into close contact with the wearer.

[0125] Furthermore, in the absorbent core 121 having a two-layer structure, rigidity is further increased, and the absorbent core is more likely to stiffen. However, the low-basis-weight region 40 makes the absorbent core 121 easy to bend, making it possible to alleviate the feeling of discomfort during use of the diaper. Furthermore, in the absorbent core 121 having a two-layer structure, the low-basis-weight region 40 is provided in both the portion of the upper-layer core 121A that overlaps with the extension 30E and the portion of the lower-layer core 121B that overlaps with the extension 30E. This makes it possible to contract the low-basis-weight region 40 by the elastic members 35 and 36, making it possible to suppress irregular deformation of the absorbent core 121. Figure 7 In the present embodiment, the low-basis-weight region 40 is provided in both the portion of the upper-layer core 121A that overlaps with the extension 30E and the portion of the lower-layer core 121B that overlaps with the extension 30E. However, it is enough to provide the low-basis-weight region 40 in at least either one of the upper-layer core 121A and the lower-layer core 121B.

[0126] Furthermore, Figure 7 The diaper 1 in the present embodiment is a two-piece type, does not have an exposed portion 10E of the absorbent main body 10, and includes a crotch outer cover member 50 that is located between the front outer cover member 20 and the rear outer cover member 30 and connects them. In this case, the extension on one side in the front-rear direction is a region that extends from the lower end of the junction 2 to the lower end of the outer cover member on that side. Furthermore, although not shown, in the case of a two-piece diaper 1 having an outer cover member in which the front outer cover member 20 and the rear outer cover member 30 are seamlessly continuous with each other, the extension is a region from the lower end of the junction 2 to the lower end of the diaper 1.

[0127] ==Second Embodiment======

[0128] Figure 8 is an explanatory diagram that illustrates the diaper 1 of the second embodiment, and is a schematic plan view of the diaper 1 in an unfolded and stretched state. The transverse elastic member and the oblique elastic member provided in the extension 30E are not limited to being separate members, but can be a single member.

[0129] As with the oblique elastic member 36 of the first embodiment, Figure 8The elastic members 60 shown are provided along the outer edge of the substantially trapezoidal extension 30E. Therefore, each elastic member 60 is fixed to the sheet in a state of being stretched in the left-right direction. The elastic member 60 includes a horizontal portion 602 (corresponding to a lateral elastic member) that stretches and contracts in the left-right direction, and an inclined portion 601 that is fixed to the sheet in a state of being stretched in the inclined direction and stretches and contracts in the inclined direction. Even in this case, the low-basis-weight region 40 provided in the portion of the absorbent core 121 that overlaps the extension 30E can contract in the left-right direction and the up-down direction due to the inclined portion 601 and the horizontal portion 602, so that irregular deformation of the absorbent core 121 can be suppressed. Furthermore, when the contracted absorbent core 121 expands in the left-right direction and the up-down direction due to the inclined portion 601 and the horizontal portion 602, the absorbent core 121 is allowed to come into close contact with the wearer's body.

[0130] == Third Embodiment ==

[0131] Figure 9 is an explanatory diagram illustrating the diaper 1 of the third embodiment, and is a schematic plan of the diaper 1 in an unfolded and stretched state. Figure 10 A is a schematic front view of the diaper 1 of the third embodiment in a natural state, Figure 10 B is a schematic front view of the diaper 1 of the third embodiment in a worn state.

[0132] In the diaper 1 of the first embodiment and the second embodiment, all or part of the elastic members fixed to the sheet in a state of being stretched in the left-right direction are defined as the lateral elastic members 35 and 602, and all or part of the elastic members fixed to the sheet in a state of being stretched in the inclined direction are defined as the inclined elastic members 36 and 601. Therefore, in a state in which the diaper 1 is stretched to the extent that the wrinkles are eliminated, the lateral elastic members 35 and 602 are arranged in the left-right direction, and the inclined elastic members 36 (inclined portions 361) and 601 are arranged in the inclined direction.

[0133] In the diaper 1 of the third embodiment, the extension 30E is provided with elastic members 70 fixed to the sheet in a state of being stretched in the left-right direction, but the extension 30E is not provided with elastic members fixed to the sheet in a state of being stretched in the inclined direction. Even in this case, in the natural state (non-stretched state) of the diaper 1 shown in A and Figure 10 the natural state (non-stretched state) of the diaper 1 shown in A and Figure 10 the worn state of the diaper 1 shown in B, the elastic members 70 each have a horizontal portion 702 (corresponding to a lateral elastic member) that extends in the left-right direction and stretches and contracts in the left-right direction, and an inclined portion 701 (corresponding to an inclined elastic member) that extends in the inclined direction and stretches and contracts in the inclined direction.

[0134] Accordingly, the low-basis-weight region 40 provided in the portion of the absorbent core 121 overlapping with the extension portion 30E can contract in the left-right direction and the up-down direction due to the inclined portion 701 and the horizontal portion 702, so that irregular deformation of the absorbent core 121 can be suppressed. Further, when the contracted absorbent core 121 expands in the left-right direction and the up-down direction due to the inclined portion 701 and the horizontal portion 702, the absorbent core 121 is allowed to be in close contact with the wearer's body.

[0135] Thus far, the above-described embodiments have been explained for the purpose of facilitating the understanding of the present application, but are not to be construed in a limiting manner. The present disclosure can be changed or modified in various ways without departing from the gist thereof, and encompasses equivalents thereof.

[0136] Explanation of Reference Signs

[0137] 1: diaper (pant-type absorbent article), 2: joint portion,

[0138] 1F: front waist portion, 1B: back waist portion, 1C: crotch portion,

[0139] 10: absorbent main body, 10E: exposed portion,

[0140] 11: front sheet, 12: absorbent body,

[0141] 121: absorbent core, 122: core wrap sheet, 123: compression portion,

[0142] 13: back sheet, 14: outer cover sheet,

[0143] 15: leakage barrier portion, 151: leakage barrier elastic member,

[0144] 20: front outer cover member (outer cover member), 21: skin side sheet, 22: non-skin side sheet,

[0145] 23: cover sheet, 24: waist elastic member,

[0146] 30: back outer cover member (outer cover member), 30E: extension portion,

[0147] 31: skin side sheet, 32: non-skin side sheet,

[0148] 33: cover sheet, 34: waist elastic member,

[0149] 35: transverse elastic member, 36: inclined elastic member,

[0150] 40: low-basis-weight region, 41: longitudinal region, 42: transverse region, 43: high-basis-weight region,

[0151] 50: crotch outer cover member,

[0152] 60: elastic member,

[0153] 601: inclined portion (inclined elastic member), 602: horizontal portion (transverse elastic member)

[0154] 70: elastic member,

[0155] 701: inclined portion (inclined elastic member), 702: horizontal portion (transverse elastic member).

Claims

1. A pant-type absorbent article having an up-down direction, a left-right direction, and a front-rear direction, the absorbent article comprising: an absorbent main body including an absorbent core; and an outer cover member disposed on a non-skin side with respect to the absorbent main body; both side portions in the left-right direction of each of a pair of waist portions in the outer cover member are joined by a pair of joint portions; the outer cover member has an extension portion, the extension portion is a portion extending to a lower side from at least either of the pair of waist portions, the extension portion has a string-like transverse elastic member which stretches and contracts in the left-right direction, and an oblique elastic member which stretches and contracts in an oblique direction oblique with respect to the left-right direction; a plurality of low basis weight regions are provided in a portion of the absorbent core overlapping with the extension portion when the pant-type absorbent article is in an unfolded state, the low basis weight region is a region of the absorbent core in which a basis weight is lower than that of a surrounding region and which extends in at least either of the up-down direction and the left-right direction, wherein the low basis weight region has a plurality of longitudinal regions longer in the up-down direction than in the left-right direction; the plurality of longitudinal regions are arranged side by side with intervals in the left-right direction, the absorbent core has a plurality of compressed portions in which a portion of the absorbent core is compressed in a thickness direction, and in a stretched state of the pant-type absorbent article, an average length of the compressed portions in the left-right direction is smaller than an average interval between the longitudinal regions arranged side by side in the left-right direction.

2. The pant-type absorbent article according to claim 1, wherein the transverse elastic member and the oblique elastic member are separate members, and have an overlap portion in which the transverse elastic member and the oblique elastic member partially overlap in the front-rear direction.

3. The pant-type absorbent article according to claim 1 or 2, wherein a total value of a force for stretching the oblique elastic member of the extension portion in the oblique direction by a predetermined length is greater than a total value of a force for stretching the transverse elastic member of the extension portion in the left-right direction by a predetermined length.

4. The pant-type absorbent article according to claim 1, wherein the outer cover member has the extension portion extending to a lower side from a rear waist portion.

5. The pant-type absorbent article according to claim 1, wherein one side portion of the outer cover member located in one side in the front-rear direction has the extension portion, the other side portion of the outer cover member located in the other side in the front-rear direction has a rectangular shape in a stretched state; the absorbent main body has an exposed portion on a lower side of the one side portion of the outer cover member in the front-rear direction and on a lower side of the other side portion of the outer cover member in the front-rear direction, the exposed portion has a non-skin side surface exposed to the outside, and a plurality of low basis weight regions are provided in a portion of the absorbent core located in the exposed portion when the pant-type absorbent article is in an unfolded state. The low basis weight region is a region of the absorbent core in which the basis weight is lower than that of the surrounding region and extends in at least either of the up-down direction and the left-right direction.

6. The pant-type absorbent article according to claim 1, wherein The extension portion has a plurality of the transverse elastic members arranged side by side in the up-down direction; In a laid-open state of the pant-type absorbent article, The position of the longitudinal region in the up-down direction overlaps the positions of two or more of the transverse elastic members in the up-down direction.

7. The pant-type absorbent article according to claim 1, wherein The extension portion has a plurality of the transverse elastic members arranged side by side in the up-down direction, and The lower end of the oblique elastic member is positioned on the lower side of the lowest transverse elastic member.

8. The pant-type absorbent article according to claim 1, wherein The low basis weight region has The longitudinal region, and A transverse region that is longer in the left-right direction than in the up-down direction, and the longitudinal region and the transverse region are arranged crossing each other.

9. The pant-type absorbent article according to claim 1, wherein The basis weight of the absorbent body including the absorbent core is 400 g / m 2 The above.

10. The pant-type absorbent article according to claim 1, wherein The outer member has a waist elastic member that stretches and contracts in the left-right direction in the waist portion, and A plurality of low basis weight regions are provided in a portion of the absorbent core that overlaps the waist portion when the pant-type absorbent article is in a laid-open state, The low basis weight region is a region of the absorbent core in which the basis weight is lower than that of the surrounding region and extends in at least either of the up-down direction and the left-right direction.

11. The pant-type absorbent article according to claim 10, wherein When the pant-type absorbent article is in a laid-open and stretched state, The total area of the low basis weight regions in the portion of the absorbent core that overlaps the waist portion Is less than The total area of the low basis weight regions in the portion of the absorbent core that overlaps the extension portion.

12. The pant-type absorbent article according to claim 10 or 11, wherein The low basis weight region has a transverse region that is longer in the left-right direction than in the up-down direction, and When the pant-type absorbent article is in a laid-open state, the transverse region is in a portion of the absorbent core that overlaps the waist portion on the back side.

13. The pant-type absorbent article according to claim 10, wherein The low basis weight region has a transverse region that is longer in the left-right direction than in the up-down direction, and When the pant-type absorbent article is in a laid-open state, a plurality of the transverse regions are arranged side by side in the up-down direction in a portion of the absorbent core that overlaps the waist portion on the front side.

14. The pant-type absorbent article according to claim 1, wherein The absorbent main body has an exposed portion on the lower side of the front side portion of the outer member and the lower side of the back side portion of the outer member, The exposed portion has a non-skin side exposed to the outside, and The low-basis-weight region is provided at a lower end of at least either of a front side of the outer member and a rear side of the outer member in the up-down direction.

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