Short pants type disposable diaper

Abstract

A pair of shorts-type disposable diaper (1) has an absorbent main body (10) equipped with an absorbent core (11), a belly-side waist portion (30), and a back-side waist portion (40), the belly-side waist portion (30) being provided with a belly-side waist elastic member (35). The belly-side waist portion (30) has a belly-side low stretch area (61) including a portion in which at least a part of the belly-side waist elastic member (35) is discontinuous in the left-right direction, thereby reducing the contractive force as compared with other areas. In the left-right direction, one side end of the belly-side low stretch area (61) is located more toward the one side than one side end of the absorbent core (11), and the other side end of the belly-side low stretch area (61) is located more toward the other side than the other side end of the absorbent core (11). The belly-side waist portion (30) has a portion in which the absorbent core (11) and the belly-side low stretch area (61) overlap each other when viewed in the thickness direction.

Description

Technical Field

[0001] This invention relates to a shorts-type disposable diaper. Background Technology

[0002] In shorts-type disposable diapers, to prevent the diaper from slipping off the wearer's body (waist) when put on, a common practice is to configure as many waist elastic members (e.g., elastic threads) as possible to enhance the contraction around the waist and ensure close contact between the diaper and the wearer's body. For example, Patent Document 1 discloses a shorts-type absorbent article in which multiple waist elastic members 52 are configured in the waist portion E, which is positioned around the waist and extends circumferentially.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2001-314441 Summary of the Invention

[0006] The problem the invention aims to solve

[0007] In the shorts-type diaper described in Patent Document 1, which incorporates multiple elastic waistbands in the waist area, the lateral contraction of these elastic waistbands causes the absorbent core (absorbent material) to contract in the same direction, potentially leading to decreased absorbency and fit when the diaper is worn. Specifically, this can create the impression of the absorbent material being loose on the wearer's abdomen (front), potentially causing discomfort. Furthermore, near the leg openings on the abdomen, where the fat layer is thinner than on the back, strong contraction of the elastic waistbands can leave rubber marks on the skin around the wearer's legs, potentially causing discomfort.

[0008] The present invention was made in view of conventional problems such as those described above, and the object of the present invention is to provide a shorts-type disposable diaper in which the absorbent core hardly shrinks on the ventral side and hardly forms rubber marks on the wearer's skin.

[0009] Solution for solving the problem

[0010] A key aspect of the invention for achieving the above objectives is a shorts-type disposable diaper having intersecting vertical, horizontal, and front-back directions. The disposable diaper includes: an absorbent body comprising a liquid-absorbent core; a ventral waist portion; and a dorsal waist portion. The ventral waist portion is provided with a plurality of ventral waist elastic members that extend and contract in the horizontal direction. The ventral waist portion has a low-elasticity ventral region, which is a region where the contractile force is reduced compared to other regions due to at least a portion of each of the plurality of ventral waist elastic members being discontinuous in the horizontal direction. In the horizontal direction, one end of the low-elasticity ventral region is located on one side relative to one end of the absorbent core; the other end of the low-elasticity ventral region is located on the other side relative to the other end of the absorbent core. The disposable diaper has a portion where the absorbent core overlaps with the low-elasticity ventral region when viewed in the unfolded state along the thickness direction.

[0011] Other features of the invention will become clear from reading this specification with reference to the accompanying drawings.

[0012] The effects of the invention

[0013] According to the present invention, a shorts-type disposable diaper can be provided, wherein the absorbent core hardly shrinks on the ventral side and hardly leaves rubber marks on the wearer's skin. Attached Figure Description

[0014] [ Figure 1 ] Figure 1 This is a schematic 3D diagram of diaper 1.

[0015] [ Figure 2 ] Figure 2 This is a plan view of diaper 1 in its unfolded and elongated state.

[0016] [ Figure 3 ] Figure 3 It is along Figure 2 A schematic cross-sectional view of line AA in the diagram.

[0017] [ Figure 4 ] Figure 4 It is along Figure 2 A schematic cross-sectional view of line BB in the diagram.

[0018] [ Figure 5 ] Figure 5 This is a diagram showing the configuration of the design logo section 90.

[0019] [ Figure 6 ] Figure 6 A and Figure 6B are plan and cross-sectional views showing a variant of diaper 1, respectively. Detailed Implementation

[0020] From the description in this specification and the accompanying drawings, at least the following will become clear.

[0021] A shorts-type disposable diaper has intersecting vertical, horizontal, and front-back directions. The disposable diaper includes: an absorbent body comprising a liquid-absorbent core; a ventral waist portion; and a dorsal waist portion. The ventral waist portion is provided with a plurality of ventral waist elastic members that stretch and contract in the horizontal direction. The ventral waist portion has a low-stretch region, which is a region where the contractile force is reduced compared to other regions due to at least a portion of each of the plurality of ventral waist elastic members being discontinuous in the horizontal direction. In the horizontal direction, one end of the low-stretch region is located on one side relative to one end of the absorbent core; the other end of the low-stretch region is located on the other side relative to the other end of the absorbent core. The disposable diaper has a portion where the absorbent core overlaps with the low-stretch region when viewed in the unfolded state along the thickness direction.

[0022] According to the aforementioned shorts-type disposable diaper, the contractile force of the waist elastic member in the abdominal waist area hardly acts on the absorbent core, and the absorbent core hardly contracts when the diaper is put on. This suppresses the deterioration of absorbency and fit. Furthermore, since the absorbent core hardly contracts in the abdominal area, which is easily visible when the diaper is put on, the user experiences minimal discomfort. Additionally, the contractile force caused by the waist elastic member does not act on the lateral side of the absorbent core, so the waist elastic member hardly presses against the wearer's skin near the leg openings on the abdominal side, preventing the formation of rubber marks on the skin.

[0023] In such a shorts-type disposable diaper, it is desirable that the back waist portion is provided with a plurality of back waist elastic members that stretch in the left-right direction, the back waist portion having a back low stretch region, the back low stretch region being a region where the contractile force is reduced compared to other regions due to at least a portion of each of the plurality of back waist elastic members being discontinuous in the left-right direction, and the left-right width of the back low stretch region is narrower than the left-right width of the ventral low stretch region.

[0024] According to the aforementioned shorts-type disposable diaper, the contractile force acting on the back waist is large. Therefore, although the contractile force acting on the ventral waist is small, an appropriate strength of contractile force in the circumferential direction acts on the ventral waist as a whole and the entire back waist. In addition, the lateral contraction of the back waist pulls the ventral waist to the left and right sides. As a result, the sheet components constituting the ventral waist come into close contact with the wearer's skin and tighten, so that the ventral waist will hardly slip off.

[0025] In such shorts-type disposable diapers, it is desirable that the lateral width of the low-elasticity back area is narrower than the lateral width of the absorbent core.

[0026] The aforementioned shorts-type disposable diaper features a wider back stretch area (smaller than the absorbent core) that increases the elasticity of the back side. This widens the stretch area and enhances the contractile force exerted on the back waist by the waist elastic member, ensuring adequate contractile force across the entire waistband. Furthermore, because the contractile force from the waist elastic member acts on the absorbent core on the back, the core conforms easily to the wearer's body, effectively preventing leakage of feces and other substances.

[0027] In such a shorts-type disposable diaper, it is desirable that the absorbent body has a pair of leak-proof wall portions on both sides in the left-right direction, and that one end of the ventral low-stretch region is located on one side relative to one side of the leak-proof wall portion in the left-right direction, and the other end of the ventral low-stretch region is located on the other side relative to the other side of the leak-proof wall portion.

[0028] According to the aforementioned shorts-type disposable diaper, when the diaper is worn, the contractile force caused by the elastic waistband hardly acts on the leak-proof wall, which makes it easy for the leak-proof wall to remain upright without folding or twisting. Therefore, it causes almost no discomfort to the wearer and can suppress side leakage of excrement.

[0029] In such a shorts-type disposable diaper, it is desirable that, in the left-right direction, one end of the ventral low-stretch region is located on one side relative to one end of the absorbent body, and the other end of the ventral low-stretch region is located on the other side relative to the other end of the absorbent body.

[0030] According to the above-mentioned shorts-type disposable diapers, the contraction force caused by the elastic waist component hardly acts on the left and right ends of the absorbent body and its outer area, so there is almost no rubber mark near the wearer's legs.

[0031] In such a shorts-type disposable diaper, it is desirable to have a pair of side joints at both ends in the left-right direction, the pair of side joints connecting the ventral waist portion and the dorsal waist portion in a ring manner, and in the region in the left-right direction between the outer left-right end of the absorbent body and the side joints, the ventral low-stretch region is narrower in the left-right direction than the region adjacent to the outer left-right side of the ventral low-stretch region.

[0032] According to the aforementioned shorts-type disposable diaper, the ventral stretch area is larger than the ventral low stretch area in the two outer regions of the absorbent body, which makes it easier for the contraction force of the waist elastic member to take effect. Therefore, compared with the case where the ventral stretch area is narrower than the ventral low stretch area, the deterioration of the fit of the ventral waist part on the wearer's abdomen can be suppressed.

[0033] In such a shorts-type disposable diaper, it is desirable to have a pair of side joints at both ends in the left-right direction, the pair of side joints connecting the ventral waist portion and the dorsal waist portion in a ring manner, and in the region in the left-right direction between the outer left-right end of the absorbent body and the side joints, the ventral low-stretch region is wider in the left-right direction than the region adjacent to the outer left-right side of the ventral low-stretch region.

[0034] Based on the aforementioned shorts-type disposable diaper, compared to a case where the stretchable area on the abdomen is larger than the low-stretch area on the abdomen, the contractile force acting on the waist can be reduced, thus further making the absorbent body less prone to shrinkage. Furthermore, the area where the contractile force caused by the waist elastic member has almost no effect becomes larger on the left and right sides of the absorbent body, thus preventing rubber marks from forming on the skin around the wearer's abdomen and legs.

[0035] In such a shorts-type disposable diaper, it is desirable that the vertical length of the portion where the low-elasticity area is provided on the abdominal waist is longer than the vertical length of the portion where the low-elasticity area is not provided.

[0036] According to the above-mentioned shorts-type disposable diaper, the lateral contraction force generated by the waist elastic member is weakened in a wide range of vertical direction on the abdominal side waist, the absorbent core hardly shrinks, and hardly forms rubber marks on the wearer's skin.

[0037] In such a shorts-type disposable diaper, it is desirable that the vertical length of the portion in the ventral waist section where the low-elasticity ventral area is provided is equal to or less than the vertical length of the portion where the low-elasticity ventral area is not provided.

[0038] Based on the aforementioned shorts-type disposable diapers, compared to cases where the low-elasticity area is larger than the elasticity area, the contractile force exerted by the waist elastic component on the abdominal waist can be increased. Therefore, positional deviation and deterioration of fit can be suppressed when putting on the diaper.

[0039] In such shorts-type disposable diapers, it is desirable that elastic members be continuously arranged from one end to the other in the upper part of the ventral waist and the dorsal waist.

[0040] According to the above-mentioned shorts-type disposable diaper, a waist elastic member is continuously arranged circumferentially in the upper part of the waist opening formed on the abdominal side and the back side, which can enhance the fit of the waist opening.

[0041] In such a shorts-type disposable diaper, it is desirable that the back waist section is provided with a plurality of back waist elastic members that extend and retract in the left-right direction, and that the average stress of the abdominal waist elastic members in the ventral waist section is less than the average stress of the back waist elastic members in the back waist section.

[0042] Based on the aforementioned shorts-type disposable diaper, by configuring the waist elastic member to weaken the stress in the ventral waist area, rubber marks are virtually eliminated from the wearer's ventral skin. Furthermore, by configuring the waist elastic member to strengthen the stress in the back waist area, the contractile force on the back is enhanced, thereby compensating for the weak contractile force on the ventral side. This makes it easier to prevent the back and ventral waist areas from slipping off the wearer's body (waist area) when putting on the diaper.

[0043] In such a shorts-type disposable diaper, it is desirable that, in the vertical direction, let F1 be the range in the ventral waist section where the ventral low-elasticity area is provided, and let F2 be the range in the ventral waist section where the ventral low-elasticity area is not provided, the average stress of the back waist elastic member in the range corresponding to range F1 in the back waist section is greater than the average stress of the back waist elastic member in the range R2 corresponding to range F2 in the back waist section.

[0044] According to the above-mentioned shorts-type disposable diaper, by increasing the stress in the area (R1) of the back waist corresponding to the area F1 of the abdominal waist, the area F1 of the abdominal waist is easily stretched in the left and right direction through the area (R1), which can suppress the reduction of contractile force as a whole. Therefore, when wearing diaper 1, the abdominal waist and back waist can be prevented from slipping off the wearer's body.

[0045] In such a shorts-type disposable diaper, it is desirable that, in the vertical direction, within the range corresponding to range F1 in the dorsal waist section, the average stress of the dorsal waist elastic member in the upper half of the range is greater than the average stress of the dorsal waist elastic member in the lower half of the range.

[0046] According to the above-mentioned shorts-type disposable diaper, in the area (R1) corresponding to the area F1 of the back waist and the ventral waist, the lower area (R1d) in the vertical direction is part of the leg opening. Therefore, by making the stress in the lower area (R1d) weaker than the stress in the upper area (R1u), the excessive contractile force on the wearer's legs is hardly exerted, and discomfort can be minimized.

[0047] In such a shorts-type disposable diaper, it is desirable that, among the abdominal waist elastic members continuously disposed in the abdominal waist portion from one end to the other in the left-right direction, the lowermost abdominal waist elastic member in the vertical direction is located below the upper abdominal end of the absorbent core in the vertical direction.

[0048] According to the aforementioned shorts-type disposable diaper, in a continuous elastic member extending from one end to the other in the left-right direction, the upper end of the absorbent core is pressed against the wearer's body by the contractile force of the elastic member located at the lower end, and almost no gap is formed between the upper end of the absorbent core and the wearer's skin. Therefore, excretions such as urine can be prevented from leaking from this gap to the outside (upper side) of the absorbent core.

[0049] In such a shorts-type disposable diaper, it is desirable that, among the abdominal waist elastic members continuously disposed in the abdominal waist portion from one end to the other in the left-right direction, the lowermost abdominal waist elastic member in the vertical direction is located above the upper abdominal end of the absorbent core in the vertical direction.

[0050] In the aforementioned shorts-type disposable diaper, the absorbent core does not cover any waist elastic member, therefore the contractile force of the waist elastic member does not act on the absorbent core. This makes it easier to prevent the absorbent core from contracting in the lateral direction.

[0051] In such a shorts-type disposable diaper, it is desirable that the shorts-type disposable diaper has a design mark portion that, when viewed in the thickness direction, overlaps with at least a portion of the abdominal waist portion, and that the lateral width of the design mark portion is narrower than the lateral width of the abdominal low stretch region.

[0052] Based on the aforementioned shorts-type disposable diaper, the waistband component hardly contracts in the left-right direction within the low-elasticity area on the abdomen. Therefore, the design markings located inside this low-elasticity area also hardly contract in the left-right direction. Consequently, when viewing the diaper from the abdomen, the user can easily visually identify the design markings.

[0053] ===Implementation Methods===

[0054] The following description uses a shorts-type disposable diaper (hereinafter also referred to as "diaper 1") as an example to illustrate the shorts-type absorbent articles according to the present invention. However, the shorts-type diapers according to the present invention are also applicable to shorts-type absorbent articles other than diapers, such as shorts-type sanitary napkins and other shorts-type absorbent articles.

[0055] <The Construction of Diaper 1>

[0056] Figure 1 This is a schematic 3D diagram of diaper 1. Figure 2 This is a plan view of diaper 1 in its unfolded and elongated state. Figure 3 It is along Figure 2 A schematic cross-sectional view of line AA in the diagram. Figure 4 It is along Figure 2 The schematic cross-sectional view taken from line BB in the figure. Note that the “stretched state” of diaper 1 refers to the state in which the entire diaper 1 (the entire product) is stretched to the point of being wrinkle-free. Specifically, the diaper is stretched to the point that the dimensions of the constituent components of diaper 1 (e.g., the absorbent body 10, waist member 20, etc., described later) are the same as or close to the dimensions of the components themselves.

[0057] exist Figure 1 In the shorts-type configuration shown, diaper 1 has intersecting vertical, horizontal, and front-back directions, and has a waist opening BH and a pair of leg openings LH and LH.

[0058] The upper side in the vertical direction corresponds to the waist opening side, and the lower side corresponds to the crotch side. Furthermore, the front side in the front-back direction corresponds to the wearer's abdomen, and the back side corresponds to the wearer's back. Additionally, in Figure 2 In its unfolded state, diaper 1 has longitudinal and transverse sections that intersect each other. The longitudinal section is perpendicular to the longitudinal section. Figure 1 The vertical direction is consistent with the horizontal direction and corresponds to the length direction of the absorbent body 10. Figure 1 The left and right directions are consistent. Furthermore, such as... Figure 3 As shown, the direction in which the constituent components of diaper 1 are stacked is called the thickness direction. In the thickness direction, the side that contacts the wearer's skin is the skin side, and the opposite side of the skin side is the non-skin side.

[0059] The diaper 1 has an absorbent body 10 for liquid absorption and a waist member 20 disposed on the non-skin side of the absorbent body 10. The waist member 20 has a ventral waist portion 30 and a dorsal waist portion 40, with the ventral waist portion 30 corresponding to the front part of the diaper 1 and the dorsal waist portion 40 corresponding to the back part of the diaper 1. That is, the diaper 1 of this embodiment is a so-called three-piece shorts-type diaper, including the absorbent body 10 as a first component that contacts the crotch of the wearer and absorbs excrement such as urine, the ventral waist portion 30 as a second component that covers the ventral part of the wearer, and the dorsal waist portion 40 as a third component that covers the dorsal part of the wearer. However, the diaper 1 is not limited to being a three-piece type, but may be a two-piece shorts-type diaper having the waist member 20 and the absorbent body 10 formed integrally with the front and back parts.

[0060] exist Figure 2 In its unfolded state, with the ventral waist portion 30 and the dorsal waist portion 40 arranged parallel to each other in the longitudinal direction, the absorbent body 10 spans between the ventral waist portion 30 and the dorsal waist portion 40. The longitudinal ends 10ea and 10eb of the absorbent body 10 are respectively joined and fixed to the skin side of the nearest waist portion 30 and 40, forming a roughly H-shaped shape in the plan view. Then, the absorbent body 10 in this state is folded at a folded position at the central position CL in the longitudinal direction. In this folded state, the ventral waist portion 30 and the dorsal waist portion 40, facing each other, are joined and connected at their left and right side portions 30sw and 40sw, forming a pair of side joints 50 and 50. That is, the ventral waist portion 30 and the dorsal waist portion 40 are formed into a ring shape through these side joints 50 and 50. Therefore, the diaper 1 becomes as follows... Figure 1 The design depicts a shorts-like configuration with a waist opening (BH) and a pair of leg openings (LH and LH). Note that the side joints (50) are formed using known joining methods such as welding or bonding.

[0061] (Absorbent Subject 10)

[0062] like Figure 3 and Figure 4 As shown, the absorbent body 10 has an absorbent core 11 for absorbing excrement, a front sheet 12 disposed on the skin side in the thickness direction relative to the absorbent core 11, and a back sheet 13 disposed on the non-skin side relative to the absorbent core 11. However, the absorbent body 10 may include other sheet members. For example, a second sheet (not shown) may be provided in the thickness direction between the front sheet 12 and the absorbent core 11.

[0063] The absorbent core 11 is a component that absorbs and retains excretory fluids such as urine, and is formed of liquid-absorbent fibers (e.g., pulp fibers) containing a highly absorbent polymer (SAP). Note that liquid-permeable sheet components (e.g., tissue paper or nonwoven fabric) can also be used. Figure 4 The core wrapper 11b) covers the outer peripheral surface of the absorbent core 11.

[0064] The front sheet 12 is a liquid-permeable sheet and is made of hydrophilic and breathable nonwoven fabric, spunbond nonwoven fabric, etc. The back sheet 13 has a two-layer structure, which includes a liquid-impermeable sheet 13a and a hydrophobic outer sheet 13b disposed on the non-skin side of the liquid-impermeable sheet 13a. The liquid-impermeable sheet 13a can be a resin film, etc., and the outer sheet 13b can be a flexible nonwoven fabric sheet, etc.

[0065] On the left and right sides of the absorbent body 10, a pair of leak-proof wall portions 15 are respectively configured to extend longitudinally (the length direction of the absorbent body 10). In this embodiment, the leak-proof wall portions 15 are formed by the aforementioned outer sheet 13b. Specifically, in the left-right direction (lateral direction), a portion of the outer sheet 13b extends beyond the two ends 11es and 11es of the absorbent core 11, and as such... Figure 4 The outer ends 15es and 15es are folded towards the skin at their folded positions. The pair of leak-proof wall portions 15 are formed by further folding the outer sheet 13b at multiple positions relative to the absorbent core 11 on the skin side. Leak-proof wall elastic members 16, such as elastic threads, are attached to the skin-side end (front end) of each leak-proof wall portion 15 in a state of elongation along the longitudinal direction (the length direction of the absorbent body 10). When the diaper 1 is put on, due to the elasticity exhibited by the leak-proof wall elastic members 16, the leak-proof wall portions 15 stand upright from the starting point of the outer ends 15es and 15es towards the wearer's skin, and thus the diaper 1 fits against the wearer's crotch.

[0066] In addition, the leg elastic member 17, such as the elastic thread, is attached to the left and right sides of the absorbent body 10 while extending longitudinally (in the length direction of the absorbent body 10). When the diaper 1 is put on, due to the elasticity of the leg elastic member 17, the sides of the absorbent body 10 contract, and the diaper 1 easily fits around the wearer's legs.

[0067] (Abdominal and waist area 30)

[0068] like Figure 3As shown, the ventral waist portion 30 includes: a skin side sheet 31 disposed on the skin side in the thickness direction; a non-skin side sheet 32 ​​stacked adjacent to the non-skin side of the skin side sheet 31; and a ventral waist elastic member 35 (hereinafter also simply referred to as "waist elastic member 35") disposed between the skin side sheet 31 and the non-skin side sheet 32 ​​in the thickness direction. The ventral waist portion 30 basically has a two-layer structure composed of the skin side sheet 31 and the non-skin side sheet 32, but may partially have a three-layer or more structure including the skin sheet 36 described later. The skin side sheet 31 and the non-skin side sheet 32 ​​are disposed as follows: Figure 2 The plan view shown has a rectangular sheet component, which is formed from SMS nonwoven fabric, etc.

[0069] In this embodiment, the ventral waist portion 30 has a fold-back portion 32f, in which the upper end (front end in the longitudinal direction) of the non-skin side piece 32 is folded back from the non-skin side to the skin side and from the upper side to the lower side in the vertical direction. By covering a portion (upper end) of the skin side piece 31 with the fold-back portion 32f, the upper edge of the skin side piece 31 is prevented from biting into the wearer's skin. However, it is not necessary to provide the fold-back portion 32f.

[0070] Multiple elastic waist members 35 are arranged side-by-side in the vertical direction between the skin side panel 31 and the non-skin side panel 32, and are attached in a state of extension in the horizontal direction. The abdominal waist section 30 fits around the wearer's abdominal waist due to the elasticity of the elastic waist members 35.

[0071] The waist elastic member 35 can be attached using an adhesive such as a hot melt adhesive. For example, the waist elastic member 35 can be attached as follows: a hot melt adhesive is applied to the waist elastic member 35, which is then stretched at a predetermined elongation ratio and sandwiched between the skin side piece 31 and the non-skin side piece 32. That is, the skin side piece 31 and the non-skin side piece 32 are joined via the waist elastic member 35 using an adhesive. Alternatively, the waist elastic member 35 can be attached by applying an adhesive to the skin side piece 31 side and the non-skin side piece 32 side.

[0072] Additionally, the ventral waist region 30 may have a skin panel 36. For example... Figure 3 As shown, the skin patch 36 is a sheet member arranged to cover the upper end 10ea (the front end in the longitudinal direction) of the absorbent body 10 from the skin side, and functions as a cover. This prevents the upper edge of the absorbent body 10 from biting into the wearer's skin when the diaper 1 is put on. The skin patch 36 is formed of SMS nonwoven fabric or the like. Here, the skin patch 36 is not mandatory.

[0073] (Back and waist area 40)

[0074] The dorsal waist portion 40 has a structure substantially the same as that of the ventral waist portion 30. Specifically, the dorsal waist portion 40 includes: a skin side sheet 41 disposed on the skin side in the thickness direction; a non-skin side sheet 42 stacked adjacent to the non-skin side of the skin side sheet 41; and a dorsal elastic member 45 (hereinafter also simply referred to as "waist elastic member 45") disposed between the skin side sheet 41 and the non-skin side sheet 42 in the thickness direction. The structure of each member is substantially the same as that of the members of the ventral waist portion 30.

[0075] However, the shape of the dorsal waist section 40 differs from that of the ventral waist section 30. Specifically, as... Figure 2 As shown, the back waist portion 40 includes a buttock cover 40b, which has a generally trapezoidal shape and is located below the side joint portion 50 (side portion 40sw) in the vertical direction. In the buttock cover 40b, the width in the horizontal direction increases from the lower side to the upper side in the vertical direction. The buttock cover 40b is provided so that the back waist portion 40 can cover the wearer's buttocks when the diaper 1 is worn.

[0076] <Configuration of waist elastic components 35 and 45>

[0077] Next, the configuration of the waist elastic member 35 provided in the ventral waist portion 30 and the waist elastic member 45 provided in the dorsal waist portion 40 will be described in detail. As described above, the waist elastic members 35 and 45 are attached in a state of extension in the left and right direction, thus giving the waist portions 30 and 40 elasticity in the left and right direction.

[0078] Incidentally, when the waist elastic members 35 and 45 exhibit contractile force throughout the entire area of ​​the waist portions 30 and 40, the waist portions 30 and 40 are prone to contracting more overall, and due to the waist elastic members 35 and 45, there is a risk of causing discomfort to the wearer or forming linear marks on the wearer's skin. Furthermore, as the waist elastic members 35 and 45 contract in the lateral direction, the absorbent core 11 (absorbent body 10) also contracts in the lateral direction, reducing the area that can absorb excrement, leading to a risk of impaired absorbency. Additionally, when the absorbent core 11 contracts on the front (abdominal side) of the diaper 1, the wearer or caregiver can easily visually recognize the contraction of the absorbent core 11, making it easy to create the impression that the absorbency and fit of the diaper 1 have deteriorated.

[0079] Therefore, in the diaper 1 of this embodiment, by providing areas in the waist section 30 and 40 where the contraction force caused by the waist elastic members 35 and 45 hardly works, it is possible to suppress the contraction of the absorbent core 11 in the left-right direction and the formation of rubber marks on the wearer's skin.

[0080] In diaper 1, the waist elastic member 35 disposed in the abdominal waist section 30 includes continuous elastic members 35s and discontinuous elastic members 35c. The continuous elastic members 35s are continuous from one end to the other in the left-right direction, and each discontinuous elastic member 35c is at least partially discontinuous in the left-right direction. Figure 2 In the ventral waist section 30, multiple continuous elastic members 35s, 35s... are arranged in the upper region in the vertical direction, and multiple discontinuous elastic members 35c, 35c... are arranged in the region below the region where the continuous elastic members 35s are arranged.

[0081] The discontinuous elastic members 35c all have a component in the left and right central parts. Figure 2 The diagonal line indicates the discontinuity 61. In the discontinuity 61, the contractile force caused by the waist elastic member 35 is weakened or non-existent. That is, in the ventral waist portion 30, the area where the discontinuity 61 is formed is a low-extension region where the contractile force caused by the waist elastic member 35 is reduced compared to other regions. In the following text, the discontinuity 61 will also be referred to as the ventral low-extension region 61.

[0082] For example, the ventral low-elasticity region 61 is formed as follows. First, in the manufacturing step of the ventral waist portion 30, the waist elastic member 35, which is in a state of elongation in the left-right direction, is bonded to the skin side piece 31 and non-skin side piece 32 constituting the ventral waist portion 30. At this time, in the region where the discontinuity portion 61 is formed, the waist elastic member 35 is not bonded to the skin side piece 31 and non-skin side piece 32. Next, the waist elastic member 35 disposed in the region overlapping with the discontinuity portion 61 is cut near the central position in the left-right direction. Then, the cut waist elastic member 35 is contracted to both sides in the left-right direction from the cut position, and then the contraction stops at the two ends in the left-right direction of the discontinuity portion 61 (the positions where the waist elastic member 35 is bonded). Therefore, a portion of each waist elastic member 35 (discontinuous elastic member 35c) becomes discontinuous in the left-right direction, and the ventral low-elasticity region 61 is formed in this discontinuity portion. In this way, the operation of forming a discontinuous section by contracting a portion of the waist elastic member 35 will also be called "cutback".

[0083] Note that the ventral low-elasticity region 61 can be formed by methods other than cutting. For example, the following method can be adopted: attaching the waist elastic member 35 by applying an adhesive to the entire ventral waist portion 30, and cutting the waist elastic member 35 at multiple locations in a predetermined area (the area where the discontinuity 61 is to be formed) to make the waist elastic member 35 discontinuous, thereby forming a discontinuity 61 (ventral low-elasticity region 61) where contraction force does not exist.

[0084] Furthermore, in the ventral waist region 30, the area outside the ventral low-tension region 61 is referred to as the ventral extension region 71. The ventral extension region 71 is a region in which the contraction force in the left-right direction caused by the continuous elastic member 35s or the discontinuous elastic member 35c is more effective than that in the ventral low-tension region 61.

[0085] The diaper 1 of this embodiment has a portion where the low-elasticity abdominal region 61 overlaps with the absorbent core 11 when viewed along the thickness direction (see [reference]). Figure 2 Furthermore, the lateral width W61 of the ventral low-elasticity region 61 is wider than the lateral width W11 of the absorbent core 11 (W61>W11). In other words, in the lateral direction, one end 61es1 of the ventral low-elasticity region 61 is located on one side relative to one end 11es1 of the absorbent core 11, and the other end 61es2 of the ventral low-elasticity region 61 is located on the other side relative to the other end 11es2 of the absorbent core 11.

[0086] Therefore, in the ventral waist section 30, the contractile force of the waist elastic member 35 hardly acts on the absorbent core 11. Thus, when the diaper 1 is worn, the absorbent core 11 hardly contracts in the lateral direction, suppressing the deterioration of its absorbency and fit. Furthermore, the absorbent core 11 hardly contracts visually when the diaper 1 is worn, thus minimizing user discomfort. Additionally, the contractile force caused by the waist elastic member 35 does not act on the outer region located in the lateral direction of the absorbent core 11; therefore, when the diaper 1 is worn, the waist elastic member 35 hardly presses against the wearer's skin near the thin-layered ventral leg openings, preventing the formation of rubber marks on the skin.

[0087] In addition, similar to the ventral waist section 30, the dorsal waist elastic member 45 provided in the dorsal waist section 40 includes a continuous elastic member 45s and a discontinuous elastic member 45c. The continuous elastic member 45s is continuous from one end to the other in the left-right direction, and each discontinuous elastic member 45c is at least partially discontinuous in the left-right direction.

[0088] The discontinuous elastic members 45c all have a central part in the left-right direction composed of Figure 2 The discontinuity 62, indicated by the diagonal line, is where the contraction force caused by the waist elastic member 45 is weakened or nonexistent. That is, in the back waist section 40, the area where the discontinuity 62 is formed is a low-extension region where the contraction force caused by the waist elastic member 45 is reduced compared to other regions. Hereinafter, the discontinuity 62 will also be referred to as the back low-extension region 62. Furthermore, in the back waist section 40, the area other than the back low-extension region 62 is defined as the back extension region 72.

[0089] Additionally, in the diaper 1 of this embodiment, such as Figure 2 As shown, the lateral width W62 of the dorsal low-elasticity region 62 is narrower than the lateral width W61 of the ventral low-elasticity region 61 (W61>W62). Therefore, the contractile force acting on the dorsal waist portion 40 of the diaper 1 caused by the waist elastic member 45 is greater than the contractile force acting on the ventral waist portion 30 caused by the waist elastic member 35. As described above, in the ventral waist portion 30 of the diaper 1, widening the ventral low-elasticity region 61 weakens the overall contractile force of the waist elastic member 35. However, in this case, when the diaper 1 is put on, the ventral waist portion 30 is more likely to slip off the wearer's body, thus posing a risk of deterioration in the fit of the diaper 1. Therefore, in the dorsal waist portion 40, by making the dorsal low-elasticity region 61 narrower than the ventral low-elasticity region 61, the contractile force acting on the dorsal waist portion 40 caused by the waist elastic member 45 is increased.

[0090] Therefore, in diaper 1, although the contractile force acting on the ventral waist portion 30 is weak, the contractile force acting on the dorsal waist portion 40 is strong. Thus, in the ventral waist portion 30 and the dorsal waist portion 40 as a whole, a suitable intensity of contractile force acts circumferentially. Furthermore, the lateral contraction of the dorsal waist portion 40 makes it easy for the ventral waist portion 30, which is connected to the dorsal waist portion 40, to be pulled to the left and right sides. Therefore, the skin side piece 31 and non-skin side piece 32 constituting the ventral waist portion 30 are in close contact with the wearer's skin and tighten, preventing the ventral waist portion 30 from slipping off. Therefore, when diaper 1 is worn, a good fit around the wearer's waist can be achieved.

[0091] In addition, in the left-right direction, one end 62es1 of the dorsal low-elasticity region 62 is located on the other side with respect to one end 11es1 of the absorbent core 11, and the other end 62es2 of the dorsal low-elasticity region 62 is located on one side with respect to the other end 11es2 of the absorbent core 11. That is, in the dorsal waist portion 40, the left-right width W62 of the dorsal low-elasticity region 62 is narrower than the left-right width W11 of the absorbent core 11 (W62 < W11). By making the dorsal low-elasticity region 62 small in this way, the contraction force caused by the waist elastic member 45 acting on the dorsal waist portion 40 becomes larger than that acting on the ventral side, and this can make it easy to ensure an appropriate contraction force for the entire waist member 20. In addition, since the contraction force caused by the waist elastic member 45 acts on the absorbent core 11 on the dorsal side, the absorbent core 11 is easily fitted to the wearer's body, so that leakage of excrement such as feces can be suppressed. Note that when the contraction force caused by the waist elastic member 45 acts on the absorbent core 11, there is a risk that the absorbent core 11 may bend in the left-right direction. However, when the diaper 1 is worn, the dorsal side of the diaper 1 is hardly visually recognized and noticeable, so that even when the absorbent core 11 bends on the dorsal side, the user hardly feels uneasy.

[0092] In addition, as Figure 4 shown, in the left-right direction, one end 61es1 of the ventral low-elasticity region 61 is located on one side with respect to one standing start point 15es1 of the leak-proof wall portion 15, and the other end 61es2 of the ventral low-elasticity region 61 is located on the other side with respect to the other standing start point 15es2 of the leak-proof wall portion 15. That is, in the ventral waist portion 30, the left-right width W61 of the ventral low-elasticity region 61 is larger than the left-right interval W15 between the standing start points 15es and 15es of the leak-proof wall portion 15 (W61 > W15). Therefore, when the diaper 1 is worn, the contraction force caused by the waist elastic member 35 hardly acts on the leak-proof wall portion 15, which makes it easy for the pair of leak-proof wall portions 15 to maintain the standing state while maintaining the interval W15 without folding and distorting the leak-proof wall portion 15. Therefore, hardly any discomfort is caused to the wearer, and side leakage of excrement can be suppressed.

[0093] In addition, as Figure 2As shown, in the left - right direction, one end 61es1 of the ventral low - stretch region 61 is located on one side relative to one end 10es1 of the absorbent body 10, and the other end 61es2 of the ventral low - stretch region 61 is located on the other side relative to the other end 10es2 of the absorbent body 10. That is, in the ventral waist portion 30, the left - right direction width W61 of the ventral low - stretch region 61 is greater than the left - right direction width W10 of the absorbent body 10 (W61>W10). The left and right ends 10es1 and 10es2 of the absorbent body 10 are each a part that forms the corresponding leg - girth opening LH of the diaper 1 and is likely to press against the groin of the wearer. Therefore, when the waist elastic member 35 is arranged to overlap with the left and right ends 10es1 and 10es2 of the absorbent body 10, the waist elastic member 35 is likely to press against the skin near the legs of the wearer, and there is a risk of easily forming rubber marks. In contrast, in the diaper 1 of the present embodiment, the contraction force caused by the waist elastic member 35 hardly acts on the left and right ends 10es1 and 10es2 of the absorbent body 10 and the regions outside thereof. Therefore, rubber marks are hardly formed in the region around the legs of the wearer.

[0094] Then, it is desirable that in the region in the left - right direction between the outer end 10es (for example, the other end 10es2 in the left - right direction) of the absorbent body 10 and the side joining portion 50 (the side joining portion 50 on the other side in the left - right direction), the left - right direction width W61s of the ventral low - stretch region 61 is narrower than the width W71s of the ventral stretch region 71 adjacent to the outside in the left - right direction of the ventral low - stretch region 61 (W61s<W71s). In the ventral waist portion 30, the ventral low - stretch region 61 is set wide, which makes the overall contraction force weak, and there is a risk that the fit on the ventral side of the wearer becomes insufficient. Therefore, in the regions on the left and right sides of the ventral low - stretch region 61, making the ventral stretch region 71 larger than the ventral low - stretch region 61 makes the contraction force of the waist elastic member 35 likely to act. Therefore, compared with the case where the ventral stretch region 71 is narrower than the ventral low - stretch region 61, the deterioration of the fit of the ventral waist portion 30 on the ventral side of the wearer can be suppressed, and at the same time, almost no rubber marks are formed.

[0095] However, a structure can be adopted in which the lateral width W61s of the low-elasticity ventral region 61 is greater than the width W71s of the ventral elastic region 71 adjacent to the lateral side of the low-elasticity ventral region 61 (W61s>W71s). According to this structure, since the contractile force acting on the ventral waist portion 30 is smaller compared to the previous case, the absorbent body 10 can be further made less prone to contraction. Furthermore, the area where the contractile force caused by the waist elastic member 35 hardly exerts its effect becomes larger on the left and right sides of the absorbent body 10, thus preventing rubber marks from forming on the skin around the wearer's ventral legs.

[0096] In addition, such as Figure 2 As shown, the vertical length L61 of the ventral low-elasticity region 61 is longer than the vertical length L71 of the portion of the ventral elasticity region 71 adjacent to the ventral low-elasticity region 61 (L61>L71). In other words, in the ventral waist portion 30, the vertical length of the portion where the ventral low-elasticity region 61 is formed (corresponding to L61) is longer than the vertical length of the portion where the ventral low-elasticity region 61 is not formed (corresponding to L71). Therefore, within the vertical width range of the ventral waist portion 30, the lateral contraction force caused by the waist elastic member 35 is weakened, the absorbent core 11 hardly contracts, and almost no rubber marks are formed on the wearer's skin.

[0097] On the other hand, with Figure 2 Conversely, the vertical length L61 of the ventral low-elasticity region 61 can be equal to or less than the vertical length L71 of the portion of the ventral elasticity region 71 adjacent to the ventral low-elasticity region 61 (L61≤L71). In other words, in the ventral waist portion 30, the vertical length (corresponding to L61) of the portion where the ventral low-elasticity region 61 is formed can be equal to or less than the vertical length (corresponding to L71) of the portion where the ventral low-elasticity region 61 is not formed. With the above configuration, compared to the case where the length L61 is greater than the length L71, the contractile force of the waist elastic member 35 acting on the ventral waist portion 30 can be increased. For example, when the diaper size is large or when it is desirable to prevent the wearer's waistline from deteriorating, it is desirable for the ventral waist portion 30 to have a certain degree of elasticity. Therefore, in such cases, by adjusting the length in a manner that satisfies L61≤L71, positional deviation and deterioration of fit when the diaper 1 is worn can be suppressed.

[0098] Furthermore, it is desirable that elastic members be continuously arranged from one end to the other in the upper part of the ventral waist portion 30 and the dorsal waist portion 40 in the left-right direction. In the diaper 1 of this embodiment, as... Figure 2As shown, in the ventral waist section 30, the waist elastic member 35 is continuously arranged between a pair of side joints 50 and 50 located at the left and right ends. Similarly, in the dorsal waist section 40, the waist elastic member 45 is continuously arranged between a pair of side joints 50 and 50 located at the left and right ends. The upper ends of the waist sections 30 and 40 form the waist opening BH of the diaper 1. Therefore, the continuous arrangement of the waist elastic members 35 and 45 along the circumference of the waist opening BH enhances the fit of the waist opening BH. Note that even when the contraction force in the waist opening BH is high, there is almost no problem of rubber marks forming around the wearer's legs, and the likelihood of causing discomfort to the wearer when wearing the diaper 1 is low.

[0099] Furthermore, in diaper 1, it is desirable that the average stress of the waist elastic member 35 disposed on the ventral waist portion 30 is less than the average stress of the waist elastic member 45 disposed on the dorsal waist portion 40. That is, it is desirable that the force required to stretch the ventral waist portion 30, on which the elastic member 35 is disposed, by a unit length in the lateral direction is less than the force required to stretch the dorsal waist portion 40, on which the elastic member 45 is disposed, by a unit length in the lateral direction. By disposing the waist elastic member 35 in a manner that weakens the stress in the ventral waist portion 30, rubber marks are virtually prevented from forming on the wearer's ventral skin. On the other hand, by disposing the waist elastic member 45 in a manner that strengthens the stress in the ventral waist portion 40, the contractile force on the dorsal side is enhanced to compensate for the weakened contractile force on the ventral side. This makes it easier to prevent the waist portions 30 and 40 from slipping off the wearer's waist when diaper 1 is put on.

[0100] Note that stress can be measured using a tensile testing machine (e.g., an automatic plotter manufactured by Shimadzu Corporation) in the following manner. First, a sample is prepared by cutting out the portion to be measured from the diaper 1. In the above case, a pair of side joints 50 and 50 are peeled off to separate the ventral waist portion 30 and the dorsal waist portion 40. Then, the absorbent body 10 is cut at the longitudinal central position CL, separating the diaper 1 into the ventral waist portion 30 and the dorsal waist portion 40 as the sample. Next, the sample (e.g., the ventral waist portion 30) is left in its natural state, and the length between the clamps of the tensile testing machine is adjusted to be equal to the left-right length of the sample in its natural state. Then, the pair of side joints 50 and 50 are held and fixed as a whole in the vertical direction by the clamps. Afterward, the sample is pulled in the left-right direction at a constant rate, and the force when the sample elongates by a predetermined length (e.g., 125 mm) is measured. This measurement is performed n times (e.g., n = 3), and the average value is defined as the stress of each sample.

[0101] Note that "natural state" refers to the state of diaper 1 after being placed for a predetermined time. For example, after removing diaper 1 from its packaging, pull the abdominal waist section 30 and the back waist section 40 outwards to the left and right to place waist sections 30 and 40 in an "extended state." Then, maintain the "extended state" for 15 seconds, stop pulling, and place diaper 1 on a flat surface such as a table. The natural state is the state after 5 minutes of being placed flat on a flat surface.

[0102] Furthermore, as described above, in order to reduce the stress in the ventral waist portion 30 to that in the dorsal waist portion 40, it is recommended that the elongation ratio of the waist elastic member 35 when attached to the ventral waist portion 30 be less than that of the waist elastic member 45 when attached to the dorsal waist portion 40. In this case, since the leg opening LH can easily unfold on the ventral side, the wearer's legs (toes) will hardly get stuck in the leg opening LH during the putting on of the diaper 1, thereby enhancing the wearability of the diaper 1.

[0103] Additionally, a back treatment strap 80 can be provided on the non-skin side of the back waist section 40 of the diaper 1 (see...). Figure 2 The finishing band 80 is a strip-shaped component used when discarding the diaper 1. For example, by rolling the diaper 1 from the crotch side to the waist opening side after use and securing it in the rolled-up state with the finishing band 80, the diaper 1 can be discarded while maintaining a compact shape. When the stress in the abdominal waist portion 30 is less than the stress in the dorsal waist portion 40, when the used diaper 1 is rolled up such that the dorsal waist portion 40 is on the outside (i.e., the abdominal waist portion 30 is on the inside), the dorsal waist portion 40 on the outside contracts, thereby reducing the volume of the diaper 1 in the rolled-up state. In addition, by securing the diaper 1, which has been rolled up in this way, with the finishing band 80 located in the dorsal waist portion 40, the diaper 1 can be discarded in a more compact shape, which enhances convenience for the user.

[0104] Additionally, in the vertical direction, let F1 be the area of ​​the ventral waist 30 where the ventral low-tension region 61 is provided (see...). Figure 2 And let F2 be the range where the ventral low-twist region 61 is not set (see...). Figure 2Ideally, the average stress of the waist elastic member 45 in region R1 corresponding to region F1 of the back waist section 40 should be greater than the average stress of the waist elastic member 45 in region R2 corresponding to region F2 of the back waist section 40. In region F1 of the ventral waist section 30, due to the presence of the ventral low-elasticity region 61, the stress caused by the ventral waist section 30 is smaller in region F1 compared to region F2. That is, the ventral waist section 30 has a weak contractile force in region F1, making it easier for the ventral waist section 30 to slip off the wearer's body. Therefore, by making the stress in region R1 corresponding to region F1 of the back waist section 40 stronger than the stress in region R2, region F1 of the ventral waist section 30 is more easily pulled in the lateral direction by region R1 of the back waist section 40, thereby suppressing the overall reduction in contractile force. Therefore, when wearing diaper 1, the abdominal waist section 30 and the back waist section 40 can be prevented from slipping off the wearer's body.

[0105] Furthermore, it is desirable that the average stress of the waist elastic member 45 in the upper region R1u, located at the center in the vertical direction within region R1 of the back waist portion 40, is greater than the average stress of the waist elastic member 45 in the lower region R1d, located at the center in the vertical direction within region R1 of region R1. In region R1 of the back waist portion 40, the lower region in the vertical direction is the portion close to the leg opening LH. Therefore, by making the stress in this region weaker than the stress in the upper region of the back waist portion 40 within region R1, excessive contractile force is hardly exerted around the wearer's legs, and discomfort is minimized when wearing the diaper 1. In this embodiment, the low-elasticity back region 62 is configured to overlap with a portion of region R1d of the back waist portion 40, which makes it easier to reduce the stress of the waist elastic member 45 in region R1d compared to region R1u.

[0106] Furthermore, among the multiple continuous elastic members 35s continuously provided in the ventral waist portion 30 from one end to the other in the left-right direction, the continuous elastic member disposed at the lowest point in the vertical direction is the lower continuous elastic member 35sd. It is desirable that the lower continuous elastic member 35sd has a portion that overlaps with the absorbent core 11 when viewed along the thickness direction. That is, as Figure 2 As shown, it is desirable that, in the vertical direction, the lower continuous elastic member 35sd is disposed below the upper ventral end 11ea of ​​the absorbent core 11. According to this configuration, when the diaper 1 is worn, the upper end of the absorbent core 11 is pressed against the wearer's body due to the contractile force of the lower continuous elastic member 35sd, and almost no gap is formed between the upper end of the absorbent core 11 and the wearer's skin. Therefore, leakage of excrement such as urine from this gap to the outer (upper) side of the absorbent core 11 can be prevented.

[0107] However, a configuration can be adopted in which the lower continuous elastic member 35sd is disposed above the upper ventral end 11ea of ​​the absorbent core 11. That is, a configuration can be adopted in which the lower continuous elastic member 35sd does not have a portion overlapping with the absorbent core 11 when viewed along the thickness direction. In this case, the absorbent core 11 does not overlap with either the continuous elastic member 35sd or the discontinuous elastic member 35c, so the contraction force of the waist elastic member 35 does not act on the absorbent core 11. This makes it easier to prevent the absorbent core 11 from contracting in the left-right direction.

[0108] In addition, a design mark section 90 is provided on the abdominal waist section 30. The design mark section 90 has a design mark such as a graphic or text, and the design mark section 90 can be visually identified when the diaper 1 is viewed from the front (abdominal side). Figure 5 This is a plan view of the diaper 1 as viewed from the non-skin side, and a diagram showing the configuration of the design mark section 90. (See diagram below.) Figure 5 As shown, the design mark portion 90 is configured such that at least a portion of it overlaps with the ventral waist portion 30 when viewed along the thickness direction. For example, the design mark portion 90 is formed by printing graphics, text characters, etc., on a predetermined area of ​​the skin side sheet 31 and non-skin side sheet 32 ​​constituting the ventral waist portion 30. Alternatively, the design mark portion 90 may be formed on another component (e.g., the liquid-impermeable sheet 13a of the absorbent body 10 or a separate sheet component) that is configured to overlap with the ventral waist portion 30.

[0109] With the design mark portion 90 configured as described, it is desirable that the lateral width W90 of the design mark portion 90 is narrower than the lateral width W61 of the abdominal low-elasticity region 61 (W61>W90). Since the waist member 30 hardly contracts in the lateral direction within the abdominal low-elasticity region 61, the design mark portion 90 located in the area inside the abdominal low-elasticity region 61 also hardly contracts in the lateral direction. Therefore, when viewing the diaper 1 from the front (abdominal side), the user can easily visually identify the design mark portion 90.

[0110] <Variant Example>

[0111] Figure 6 A and Figure 6 B are plan and cross-sectional views showing a variant of diaper 1, respectively. Figure 6 A corresponds to Figure 2 The picture, Figure 6 B corresponds to Figure 3 The image. In Figure 6 In the variant shown, the ventral waist section 30 does not have a waist elastic member 35. The rest of the structure is the same as that of the diaper 1 described above.

[0112] In this variant, since the waist elastic member 35 is not provided, the elasticity does not apply to the entire area of ​​the abdominal waist portion 30. That is, the low-elasticity abdominal region 65 is configured to extend from one end of the abdominal waist portion 30 in the left-right direction to the other end. In other words, in the diaper 1 of this variant, since the abdominal waist portion 30 does not have the waist elastic member 35, the absorbent core 11 is more difficult to contract in the left-right direction, so that the rubber marks caused by the waist elastic member 35 are almost not formed on the wearer's abdomen.

[0113] However, when wearing the diaper 1 according to this variant, the entire abdominal waist section 30 does not stretch, resulting in poor fit and a risk that the waist member 20 may easily slip off the wearer's body. Therefore, in this variant, it is desirable to increase the stress of the waist elastic member 45 provided in the back waist section 40 compared to the above embodiment. In this case, the contractile force of the waist elastic member 45 acting on the back waist section 40 increases, thus pulling the abdominal waist section 30 connected by the side joints 50 and 50 to the left and right sides, and the abdominal waist section 30 easily comes into contact with the wearer's body (abdomen). In addition, when the abdominal waist section 30 is pulled to the left and right sides, the pulling force causes the tensile force to act on the sheet member (skin side sheet 31 or non-skin side sheet 32) constituting the abdominal waist section 30, and the abdominal waist section 30 is in close contact with the wearer's body in a taut state. Therefore, even when the weight of the diaper 1 increases due to excrement, the abdominal waist section 30, which is in close contact with the wearer's body, is tightened and there is almost no positional deviation. Thus, in the modified diaper 1, since the abdominal waist section 30 does not have a waist elastic member 35, the absorbent core 11 hardly contracts in the left and right directions, and the rubber marks caused by the waist elastic member 35 are almost not formed on the wearer's abdomen.

[0114] ===Other Implementation Methods===

[0115] While the above embodiments of the present invention have been described, they are intended to facilitate understanding of the invention and not to limit its interpretation. Furthermore, variations and modifications can be made to the invention within its scope, and its equivalents are also included.

[0116] In diaper 1, the areas of the ventral waist portion 30 and the dorsal waist portion 40 can be adjusted so that the area ratio of the ventral waist portion 30 to the dorsal waist portion 40 is within a predetermined range. For example, if the area of ​​the ventral waist portion 30 is in the range of 30 to 50, it is desirable that the area of ​​the dorsal waist portion 40 is in the range of 50 to 70, and more preferably, the area ratio of the ventral waist portion 30 to the dorsal waist portion 40 is 35:65. By making the area of ​​the dorsal waist portion 40 larger than that of the ventral waist portion 30, even under conditions of high stress in the dorsal waist portion 40, the contractile pressure can be reduced, resulting in almost no discomfort to the wearer.

[0117] Explanation of reference numerals in the attached figures

[0118] 1: Diapers (disposable shorts type diapers),

[0119] 10: Absorbent subject,

[0120] 11: Absorbent core; 11b: Core-encapsulated sheet; 11c: Narrow portion.

[0121] 12: Front view,

[0122] 13: Backside film, 13a: Liquid-impermeable film, 13b: Outer packaging film.

[0123] 15: Leak-proof wall section; 16: Leak-proof wall elastic component; 17: Leg circumference elastic component.

[0124] 20: Waist components,

[0125] 30: Abdominal and waist area, 30sw: Side area,

[0126] 31: Side view of the skin

[0127] 32: Non-skin side plate; 32f: Fold-back portion.

[0128] 35: Waist elastic component (abdominal waist elastic component),

[0129] 35s: continuous elastic member; 35c: discontinuous elastic member.

[0130] 36: Skin patch

[0131] 40: Back and waist area,

[0132] 40b: Buttock cover, 40sw: Side,

[0133] 41: Skin side view, 42: Non-skin side view, 42f: Regression zone,

[0134] 45: Waist elastic component (back waist elastic component),

[0135] 45s: continuous elastic member; 45c: discontinuous elastic member.

[0136] 46: Skin patch

[0137] 50: Side joint,

[0138] 61: Ventral low-extension region (discontinuous part),

[0139] 62: Low-extension area on the dorsal side (discontinuous part),

[0140] 65: Low-extension area on the ventral side.

[0141] 71: Ventral stretching area,

[0142] 72: Rear telescopic area,

[0143] 80: Post-processing tape

[0144] 90: Logo Design Department

[0145] BH: Waist opening; LH: Leg opening.

[0146] CL: Central position (longitudinal, length direction).

Claims

1. A shorts-type disposable diaper, having intersecting vertical, horizontal, and front-back directions. The disposable diaper includes: An absorbent body, comprising a liquid-absorbent core; The abdominal and lumbar region; and Back and waist area The abdominal waist section is provided with multiple abdominal waist elastic components that extend and retract in the left-right direction. The ventral waist region has a low-elasticity ventral area. The ventral low-elasticity region is a region where, compared to other regions, the contractile force is reduced because at least a portion of each of the plurality of ventral waist elastic members is discontinuous in the left-right direction. In the left and right directions, One end of the ventral low-elasticity region is located on one side relative to one end of the absorbent core; The other end of the ventral low-elasticity region is located on the other side relative to the other end of the absorbent core; The disposable diaper has a portion in which the absorbent core overlaps with the low-elasticity abdominal region when the shorts-type disposable diaper is viewed in its unfolded state along the thickness direction. The back side waist section is provided with multiple back side waist elastic members that extend and retract in the left-right direction, and The average stress of the elastic member in the ventral waist section is less than the average stress of the elastic member in the dorsal waist section. In the vertical direction, Let F1 be the range of the abdominal low-elasticity area within the abdominal waist region, and Let F2 be the range of the abdominal waist region where the abdominal low-elasticity area is not provided. The average stress of the elastic member of the back waist in the range corresponding to range F1 in the back waist section. Greater than The average stress of the elastic member of the back waist in the range corresponding to range F2 in the back waist section. In the vertical direction, within the range corresponding to range F1 in the back waist section, the average stress of the back waist elastic member in the upper half of the range is greater than the average stress of the back waist elastic member in the lower half of the range.

2. The shorts-type disposable diaper according to claim 1, characterized in that, The back waist section has a low-elasticity area. The dorsal low-extension region is a region where the contractile force is reduced compared to other regions because at least a portion of each of the plurality of dorsal waist elastic members is discontinuous in the left-right direction. The width of the dorsal low-extension region in the left-right direction is narrower than that of the ventral low-extension region in the left-right direction.

3. The shorts-type disposable diaper according to claim 2, characterized in that, The width of the low-extension region on the back side is narrower in the left-right direction than the width of the absorbent core in the left-right direction.

4. The shorts-type disposable diaper according to any one of claims 1 to 3, characterized in that, The absorbent body has a pair of leak-proof walls on both sides in the left-right direction, and In the left and right directions, One end of the low-expansion area on the ventral side is located on one side relative to one side of the anti-leakage wall, and The other end of the low-twist area on the ventral side is located on the other side relative to the other end of the leak-proof wall.

5. The shorts-type disposable diaper according to claim 1, characterized in that, In the left and right directions, One end of the ventral low-stretch region is located on one side relative to one end of the absorbent body, and The other end of the ventral low-stretch region is located on the other side relative to the other end of the absorbent body.

6. The shorts-type disposable diaper according to claim 5, characterized in that, A pair of side joints are provided at both ends in the left-right direction. The pair of side joints connect the ventral waist and the dorsal waist in a ring-like manner, and In the region in the left-right direction between the outer left and right ends of the absorbent body and the side joint portion. The width of the ventral low-extension region in the left-right direction is narrower than the width of the region adjacent to the outer left-right direction of the ventral low-extension region.

7. The shorts-type disposable diaper according to claim 5, characterized in that, A pair of side joints are provided at both ends in the left-right direction. The pair of side joints connect the ventral waist and the dorsal waist in a ring-like manner, and In the region in the left-right direction between the outer left and right ends of the absorbent body and the side joint portion. The width of the ventral low-extension region in the left-right direction is wider than the width of the region adjacent to the outer left-right direction of the ventral low-extension region.

8. The shorts-type disposable diaper according to claim 1, characterized in that, In the ventral waist region, The vertical length of the portion with the ventral low-extension region is longer than the vertical length of the portion without the ventral low-extension region.

9. The shorts-type disposable diaper according to claim 1, characterized in that, In the ventral waist region, The vertical length of the portion with the ventral low-extension region is equal to or less than the vertical length of the portion without the ventral low-extension region.

10. The shorts-type disposable diaper according to claim 1, characterized in that, In the upper ends of the ventral waist and the dorsal waist Elastic members are continuously arranged from one end to the other in the left-right direction.

11. The shorts-type disposable diaper according to claim 1, characterized in that, In the abdominal waist elastic member continuously disposed in the abdominal waist portion from one end to the other in the left-right direction, The ventral waist elastic member located at the lowest point in the vertical direction is located below the upper ventral end of the absorbent core in the vertical direction.

12. The shorts-type disposable diaper according to claim 1, characterized in that, In the abdominal waist elastic member continuously disposed in the abdominal waist portion from one end to the other in the left-right direction, The ventral waist elastic member located at the lowest point in the vertical direction is located above the upper ventral end of the absorbent core in the vertical direction.

13. The shorts-type disposable diaper according to claim 1, characterized in that, The shorts-type disposable diaper has a design feature that, when viewed in the thickness direction, overlaps with at least a portion of the abdominal waist area, and The width of the design mark in the left-right direction is narrower than the width of the low-extension area on the ventral side in the left-right direction.

Images