Absorbent article

Abstract

To provide an absorbent article capable of suppressing leakage of excrement.SOLUTION: An absorbent article comprises: an absorber; an upper side sheet; a lower side sheet; a sheet region disposed in a front or rear side of the absorber and formed by including the upper side sheet and the lower side sheet without the presence of the absorber; a waist shrinking part formed in a position separated from a front side end portion or a rear side end portion of the absorber, having a first shrinking member disposed in a stretched state in the width direction, and shrinking in the width direction at least in a part of the waist of a wearer; a shrinkage force non-acting region disposed at least in a part of the sheet region, having a second shrinking member extending in the width direction without adhering to the upper side sheet and the lower side sheet, and preventing shrinkage force of the second shrinking member from acting; and a pair of side shrinking parts disposed at least on both left and right sides of the sheet region, and having the second shrinking member fixed in a stretched state to at least one of the upper side sheet and the lower side sheet.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to an absorbent article. [Background technology]

[0002] 2. Description of the Related Art Absorbent articles such as diapers are known in the art (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-87383 A Summary of the Invention [Problem to be solved by the invention]

[0004] In general, absorbent articles are worn in a state where the contraction force of a contractile member is used to fit closely around the wearer's waist so as to prevent leakage of excrement such as urine and feces. There is room for improvement in technology for preventing leakage of excrement from the waist in absorbent articles.

[0005] An object of the present invention is to provide an absorbent article capable of suppressing leakage of body waste. [Means for solving the problem]

[0006] An absorbent article according to one aspect of the present invention comprises: A length along a longitudinal direction corresponding to the front-to-back direction of the wearer; A length along a width direction perpendicular to the longitudinal direction; In the front-to-rear direction, a front body region located in front of the wearer, a rear body region located behind the wearer, and a crotch region located between the front body region and the rear body region, An absorbent body disposed at least in the crotch region; An upper sheet disposed on the skin side of the absorbent body; A lower sheet disposed on the non-skin facing side of the absorbent body; a sheet area provided in front of or behind the absorbent body, the sheet area being formed including the upper sheet and the lower sheet without the absorbent body being present; a waistline contraction portion that is formed at a position spaced apart from the front end or the rear end of the absorbent body, has a first contraction member that is stretched in the width direction, and contracts in the width direction around at least a portion of the waistline of the wearer; a contraction force non-action region provided in at least a portion of the sheet region, the contraction force non-action region including a second contraction member extending in the width direction without being attached to the upper sheet and the lower sheet, in which the contraction force of the second contraction member does not act; a pair of side contraction portions provided at least on both the left and right sides of the seat area, the side contraction portions including the second contraction member fixed in a stretched state to at least one of the upper sheet or the lower sheet, and contracting in the width direction on both the left and right sides of the seat area; Equipped with. Effect of the Invention

[0007] According to the present invention, leakage of excrement can be suppressed. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a diaper according to an embodiment. [Diagram 2] FIG. 2 is an exploded perspective view of the diaper according to the embodiment. [Diagram 3] FIG. 3 is a cross-sectional view of the diaper according to the embodiment taken along the width direction at the center in the longitudinal direction. [Figure 4] FIG. 4 is a plan view of the diaper according to the embodiment in a stretched state. [Diagram 5] FIG. 5 is a cross-sectional view of an absorbent core of a diaper according to an embodiment. [Figure 6] FIG. 6 is a cross-sectional view of the diaper according to the embodiment, taken along the longitudinal direction at the center in the width direction. [Figure 7]FIG. 7 is a plan view of the rear body region of the diaper according to the embodiment in a stretched state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, absorbent articles according to embodiments of the present invention will be described with reference to the drawings. Note that the configurations of the following embodiments are merely examples, and the present invention is not limited to the configurations of these embodiments.

[0010] <Embodiment> In this embodiment, the longitudinal direction of a tape-type disposable diaper (an example of an "absorbent article" in the present application, hereinafter simply referred to as a "diaper") is the direction connecting the front body arranged opposite the wearer's abdomen and the rear body arranged opposite the wearer's back. Between the front body (one side in the longitudinal direction) and the rear body (the other side in the longitudinal direction) (the center in the longitudinal direction), a crotch portion arranged under the wearer's crotch (opposed to the crotch). In addition, when the diaper is worn by a wearer (hereinafter abbreviated as "worn state"), the side facing the wearer's skin (the inner side when worn) is the skin-facing side, and the opposite side to the skin-facing side (the outer side when worn) is the non-skin-facing side. Furthermore, the direction connecting the skin-facing side and the non-skin-facing side is the thickness direction, and the direction perpendicular to both the longitudinal direction and the thickness direction is the width direction. In addition, the view from the thickness direction is the planar view. Additionally, the front, back, left and right of the diaper 1 refer to the directions that correspond to the front, back, left and right of the wearer when the diaper 1 is worn by the wearer. For example, the left and right direction in this application refers to the directions that correspond to the left and right of the wearer when the diaper 1 is worn by the wearer, and the front and back direction in this application refers to the directions that correspond to the front and back of the wearer when the diaper 1 is worn by the wearer.

[0011] FIG. 1 is a perspective view of a diaper according to the present embodiment. The diaper 1 has a length along the longitudinal direction and a length along the width direction perpendicular to the longitudinal direction. The diaper 1 has a crotch region 1B, which is a region corresponding to the crotch of the wearer covering the pubic area when worn, a front body region 1F, which is located in front of the crotch region 1B and corresponds to the front body of the wearer, and a back body region 1R, which is located behind the crotch region 1B and corresponds to the back body of the wearer. Tapes 2L and 2R that can be attached to a front patch 2F provided on the non-wearer side surface of the front body region 1F are provided on both left and right edges of the back body region 1R. When the tapes 2L and 2R are attached to the front patch 2F (attachment portion) with the front body region 1F arranged on the wearer's abdominal side and the back body region 1R arranged on the wearer's back side, the diaper 1 is fixed to the wearer's body in a state of surrounding the wearer's abdominal circumference and thighs. Since the diaper 1 is fixed to the wearer's body in this manner, the wearer can stand and walk around while wearing the diaper 1.

[0012] In the diaper 1, an absorbent capable of absorbing and retaining liquid is disposed mainly in the crotch region 1B. In addition, in order to prevent the formation of gaps between the diaper 1 and the wearer's skin that could serve as a path for liquid to flow out, the diaper 1 is provided with leg gathers 3AL, 3AR in areas surrounding the wearer's legs (thighs), and three-dimensional gathers 3BL, 3BR (an example of the "leak prevention wall" of the present disclosure) are provided widthwise inward of the leg gathers 3AL, 3AR, and a waist gather 3R (an example of the "waist circumference contraction portion" of the present disclosure) is provided in an area surrounding the wearer's abdominal circumference. The leg gathers 3AL, 3AR, three-dimensional gathers 3BL, 3BR and waist gathers 3R form a part that surrounds the wearer's abdominal circumference. The waist gathers 3R are in close contact with the wearer's skin due to the stretching force (elastic force) of the contractile member. Therefore, liquid discharged from the wearer's private parts is absorbed into the absorbent body of the diaper 1 without leaking out of the diaper 1. The contractile member may be a linear contractile member such as a thread-like rubber (thread rubber) or a band-like rubber.

[0013] FIG. 2 is an exploded perspective view of the diaper 1. FIG. 3 is a cross-sectional view of the diaper 1 when not worn, cut in the width direction at the center in the longitudinal direction. FIG. 4 is a plan view of the diaper 1 when stretched, as viewed from the skin-facing side. Note that contractile members 4C, 4SL, and 4SR are omitted in FIG. 4. The diaper 1 has a cover sheet 4 that forms an outer surface when worn. The cover sheet 4 is a sheet-like member having a substantially rectangular appearance with constrictions 4KL and 4KR at the portions corresponding to the long sides, and forms the exterior surface of the diaper 1 from the front body region 1F to the rear body region 1R. The constrictions 4KL and 4KR are provided in the portions where the wearer's thighs are located (the leg surrounding regions 10L and 10R shown in FIG. 4). The cover sheet 4 is provided to reinforce the back sheet 5 described later and to improve the feel, and for example, a nonwoven fabric made of a liquid-impermeable thermoplastic resin can be used as the material for the cover sheet 4 in order to suppress leakage of excrement. Examples of liquid-impermeable thermoplastic resins include polyethylene (PE) and polypropylene (PP). The cover sheet 4 is not limited to a single-layer structure, and may be a multi-layer (two-layer) structure having an inner cover sheet and an outer cover sheet. The cover sheet 4 forms the outer peripheral shape (outer shape) of the absorbent pad 1. The cover sheet 4 forms an exterior surface where the front body region 1F, the crotch region 1B, and the back body region 1R are connected.

[0014] The diaper 1 has a back sheet 5 (an example of the "lower sheet" of the present disclosure), an absorbent 6, and a top sheet 7 (an example of the "upper sheet" of the present disclosure) which are laminated in this order on the skin-facing side of the cover sheet 4. The back sheet 5, the absorbent 6, and the top sheet 7 are all sheet-like members having a substantially rectangular appearance, and are laminated in this order on the cover sheet 4 with their longitudinal directions coinciding with the longitudinal direction of the cover sheet 4. The back sheet 5, like the cover sheet 4, is a sheet formed of a water-impermeable thermoplastic resin material to suppress leakage of excrement. The back sheet 5 is preferably made of a material that also has moisture permeability to suppress stuffiness when worn. The top sheet 7 is a sheet-like member disposed on the skin-facing side of the wearer. The top sheet 7 is liquid-permeable in part or in its entirety. Therefore, when the diaper 1 is worn, liquid excreted from the wearer passes through the top sheet 7, which may come into contact with the wearer's skin, into the absorbent 6, and is absorbed therein. For example, a woven fabric, a nonwoven fabric, or a porous film can be used as the material for the top sheet 7. The top sheet 7 may be hydrophilic. The basis weight of the top sheet 7 is, for example, 15 to 35 g / m 2 It is.

[0015] The back sheet 5, the absorbent 6, and the top sheet 7 all extend from the front body region 1F to the rear body region 1R. Therefore, when the cover sheet 4, in which the back sheet 5, the absorbent 6, and the top sheet 7 are laminated, covers the wearer's private parts, the longitudinal ends of the back sheet 5, the absorbent 6, and the top sheet 7 are located on the wearer's ventral side and back side. In other words, the wearer's private parts are covered by the absorbent 6 from the ventral side to the back side. Therefore, whether the wearer is in a ventral or back-down position when excreting liquid, the excreted liquid comes into contact with the absorbent 6 via the top sheet 7. The top sheet 7 and the back sheet 5 are longer in the longitudinal direction than the absorbent 6, and extend to the ends of the front body region 1F and the rear body region 1R of the diaper 1.

[0016] The diaper 1 further includes contraction members 4SL, 4SR for forming the leg gathers 3AL, 3AR described above, which are provided between the cover sheet 4 and the back sheet 5 so as to stretch in the longitudinal direction of the diaper 1. An appropriate number of contraction members 4SL, 4SR (three in this embodiment) are provided depending on the contraction force (elastic force) required for the design of the diaper 1. As shown in Fig. 4, the leg gathers 3AL, 3AR are arranged to include the leg surrounding regions at both widthwise ends of the crotch region 1B where the wearer's thighs are located. The leg surrounding regions 10L, 10R are arranged at both widthwise ends of the crotch region 1B. The leg gathers 3AL, 3AR (see Fig. 1) are formed in the areas where the contractile members 4SL, 4SR are arranged.

[0017] The diaper 1 also has long, narrow, strip-shaped side sheets 8L, 8R (an example of the "pair of left and right leak-proof sheets" of the present disclosure). The side sheets 8L, 8R are non-water-permeable (liquid-impermeable) sheets provided on the long sides of the top sheet 7. Similarly to the cover sheet 4, the side sheets 8L, 8R have constrictions 8KL, 8KR at the locations where the wearer's thighs are located (leg-surrounding regions 10L, 10R shown in FIG. 4). The side sheets 8L, 8R have contraction members 8EL, 8ER (an example of the "third contraction member" of the present disclosure) arranged along the longitudinal direction of the diaper 1 for forming three-dimensional gathers 3BL, 3BR. When the diaper 1 is worn, i.e., when the diaper 1 is U-shaped in side view, the side sheets 8L, 8R are drawn in the longitudinal direction by the contraction force of the contraction members 8EL, 8ER and rise from the top sheet 7 to form three-dimensional gathers 3BL, 3BR that prevent liquid from leaking out.

[0018] The cover sheet 4 is provided with a contraction member 4C, which prevents a gap from being formed between the diaper 1 and the wearer's abdominal circumference, on the inner side in the width direction of the diaper 1 than the contraction members 4SL, 4SR and along the longitudinal direction of the diaper 1. The contraction member 4C is provided according to the elastic force (contraction force) required for the design of the diaper 1.

[0019] The contraction member 9ER for forming the above-mentioned waist gathers 3R is disposed on the waist sheet 9R provided between the back sheet 5 and the top sheet 7 at a position further back than the end of the absorbent body 6. The contraction member 9ER is disposed between the top sheet 7 and the back sheet 5 at a position farther from the absorbent body 6 than the end of the rear body region 1R side of the waist gathers 3R (the rear end side of the diaper 1), and is a sheet-like member extending wider in the width direction than the absorbent body 6. The waist sheet 9R is formed by laminating two nonwoven fabric sheets, and the contraction member 9ER is bonded between the two nonwoven fabric sheets in a stretched state in the width direction of the diaper 1. The contraction member 9ER is disposed on the waist sheet 9R with the stretch direction being the left-right direction of the diaper 1. For this reason, the waist sheet 9R has contraction properties in the width direction of the diaper 1, and functions as a strip-shaped contraction member together with the contraction member 9ER. When the tapes 2L, 2R provided on both the left and right sides of the waist sheet 9R are attached to the front patch 2F on the abdominal side of the wearer, the contraction member 9ER exerts a contraction force to fit the diaper 1 to the wearer and prevent the formation of a gap between the diaper 1 and the wearer's abdominal circumference.

[0020] A waist sheet 9F is provided between the back sheet 5 and the top sheet 7 at a position further to the ventral side than the end of the absorbent body 6. The waist sheet 9F is disposed between the top sheet 7 and the back sheet 5 at a position farther from the absorbent body 6 than the end of the front body region 1F side of the absorbent body 6 on the tip side (the front end side of the diaper 1), and is a sheet-like member extending wider in the width direction than the absorbent body 6. The waist sheet 9F is formed by laminating two nonwoven fabric sheets, similar to the waist sheet 9R. Note that no contraction member is disposed in the waist sheet 9F, and therefore the waist sheet 9F does not have contraction properties. Note that the basis weight of the waist sheets 9F and 9R is, for example, 12 to 25 g / m 2 It is.

[0021] In the present application, the state in which sheets are overlapped is not limited to a state in which the overlapping sheets are in full contact with each other, but includes a concept including a state in which the sheets are partially overlapping each other. In addition, the state in which sheets are bonded to each other includes a concept including a state in which another sheet is interposed between the sheets and the sheets are bonded to each other via the other sheet.

[0022] Next, the absorbent body 6 will be described. The absorbent body 6 according to this embodiment has a substantially rectangular shape. In the diaper 1 according to this embodiment, the absorbent body 6 has a configuration in which the proportion of SAP is relatively high.

[0023] FIG. 5 is a cross-sectional view showing the absorbent body 6 extracted from the cross-sectional view of FIG. 3. The absorbent body 6 has an absorbent core 6C and a core wrap sheet 6W that wraps the absorbent core 6C. The core wrap sheet 6W is made of a sheet that has water permeability at least on the skin-facing side, and allows liquid that has passed through the top sheet 7 to flow into the absorbent core 6C. In this embodiment, the core wrap sheet 6W is made of two tissues. One of the two tissues is placed on the non-skin-facing side, folded into the widthwise end of the skin-facing side, and bonded to the other tissue placed on the skin-facing side, including the widthwise end of the skin-facing side. As a result, the core wrap sheet 6W covers the skin-facing side and non-skin-facing side of the absorbent core 6C to wrap the absorbent core 6C and prevent the absorbent core 6C from losing its shape. The core wrap sheet 6W may be made of a single sheet.

[0024] The absorbent core 6C has a layered structure in which, from the non-skin facing side, a flow guide layer 60A, a lower SAP layer 60B, a base layer 60C, an upper SAP layer 60D, and a diffusion layer 60E are laminated. The flow guide layer 60A and the diffusion layer 60E are formed of nonwoven fabric. The flow guide layer 60A has the function of diffusing urine throughout the entire absorbent core 6C on the non-skin facing side. The diffusion layer 60E has the function of diffusing urine throughout the entire absorbent core 6C on the skin facing side. In this embodiment, the flow guide layer 60A and the diffusion layer 60E have a basis weight of, for example, 45 g / m 2 It is formed of an airlaid nonwoven fabric.

[0025] The lower SAP layer 60B is formed by bonding a large number of SAP (Super Absorbent Polymer) particles to the skin-facing side of the flow guidance layer 60A with a hot melt adhesive. In this way, the lower SAP layer 60B, which is formed by containing SAP particles, a super absorbent polymer, is disposed on the skin-facing side of the flow guidance layer 60A. The upper SAP layer 60D is formed by bonding a large number of SAP particles to the non-skin-facing side of the diffusion layer 60E with a hot melt adhesive. In this way, the upper SAP layer 60D, which is formed by containing SAP particles, a super absorbent polymer, is disposed on the non-skin-facing side of the diffusion layer 60E. Thus, in this embodiment, two SAP layers are formed in the absorbent core 6C.

[0026] In this embodiment, the SAP particles refer to a resin composition containing SAP in a granular form. The term "SAP-containing resin composition" as used herein includes both a composition consisting of SAP alone and a composition containing SAP as the main component and containing other substances to the extent that they do not adversely affect the water absorption. Examples of "other substances" include additives (such as surface modifiers added to make the particle surface hydrophobic) and unreacted monomers remaining during the synthesis of SAP.

[0027] The base layer 60C is disposed between the two SAP layers and is made of a bulky air-through nonwoven fabric. The base layer 60C is liquid permeable and diffuses liquids such as urine into the lower SAP layer 60B and the upper SAP layer 60D. The absorbent body 6 can absorb and retain liquids such as urine by the entire lower SAP layer 60B and upper SAP layer 60D.

[0028] Fig. 6 is a cross-sectional view of the diaper 1 when not being worn, cut longitudinally at the widthwise centre. As shown in Fig. 6, the core wrap sheet 6W is not bonded at the skin-facing side and non-skin-facing side at the longitudinal end sides of the diaper 1. The reason for this non-adhesion will be described later. The waist sheets 9F, 9R are bonded at their skin-facing sides to the top sheet 7, and at their non-skin-facing sides to the back sheet 5. For example, a hot melt adhesive is used for this adhesion.

[0029] When the absorbent core is made of pulp, the SAP particles are entangled with the pulp fibers and are unlikely to fall off from the absorbent core. However, in this embodiment, the absorbent core 6C does not contain pulp. In this embodiment, the SAP particles are adhered to the flow guide layer 60A made of an airlaid nonwoven fabric and the diffusion layer 60E made of an airlaid nonwoven fabric. In the absorbent body 6 having such a configuration, the SAP particles are unlikely to be entangled with the fibers and the like, and the SAP particles are likely to fall off at the end sides of the absorbent body 6 in the width direction and the length direction.

[0030] Although the SAP particles in the lower SAP layer 60B are adhered to the flow guide layer 60A with a hot melt adhesive, some SAP particles may peel off and fall off from the flow guide layer 60A. For this reason, the diaper 1 according to this embodiment may contain unfixed SAP particles. If no measures are taken in the diaper, these SAP particles may leak out to the outside of the diaper. For example, if a gap is formed between the top sheet and the back sheet, the SAP particles that have fallen off from the absorbent body may spread to the longitudinal end sides of the diaper and leak out from between the top sheet and the back sheet.

[0031] Therefore, the diaper 1 according to this embodiment includes waist sheets 9F, 9R arranged at the end side of the absorbent body 6 in the longitudinal direction. The top sheet 7 and the back sheet 5 are weakly bonded or non-bonded to each other at the end side of the absorbent body 6, i.e., between the absorbent body 6 and the waist sheets 9F, 9R. More specifically, the top sheet 7 and the back sheet 5 are weakly bonded or non-bonded in the areas D1 and D2 shown in FIG. 6. D1 is the distance between the absorbent body 6 and the waist sheet 9R on the side of the rear body region 1R. D2 is the distance between the absorbent body 6 and the waist sheet 9F on the side of the front body region 1F. The specific lengths of D1 and D2 are omitted. Here, the term "weakly bonded" refers to an adhesive strength that allows the sheets bonded to each other to be peeled off without tearing, and is an adhesive strength that is expected to cause the sheets to naturally peel off due to the action (for example, the contraction force of a contraction member) that occurs when the diaper 1 is worn. By making the top sheet 7 and the back sheet 5 non-bonded or weakly bonded in the regions D1 and D2, the SAP particles fall off the lower SAP layer 60B and the upper SAP layer 60D, enter between the top sheet 7 and the back sheet 5, and pull them apart, forming a space (hereinafter sometimes referred to as the "SAP storage space") between the top sheet 7 and the back sheet 5, and the SAP particles can be stored in the SAP storage space. In addition, since the waist sheets 9F and 9R are arranged on the longitudinal end side of the SAP storage space, the SAP particles are prevented from moving toward the end side of the waist sheets 9F and 9R. Since the waist sheets 9F and 9R are bonded relatively strongly to the top sheet 7 and the back sheet 5, the SAP storage space is prevented from communicating with the outside of the diaper 1, and the leakage of the SAP particles to the outside can be prevented. Furthermore, since the waist sheets 9F, 9R are wider than the absorbent body 6, even if SAP particles that have leaked into the SAP storage space move in the width direction, the waist sheets 9F, 9R can suppress the leakage of the SAP particles.

[0032] In addition, in the region D2, when the top sheet 7 and the back sheet 5 are not bonded, no hot melt adhesive is applied between the top sheet 7 and the back sheet 5, and when the top sheet 7 and the back sheet 5 are weakly bonded, a small amount of hot melt adhesive is applied between the top sheet 7 and the back sheet 5, so that the region D2 has a relatively low rigidity and is easily folded. Here, when the hook portions 20L, 20R of the tapes 2L, 2R in the worn state of the diaper 1 are attached to the loop portion of the front patch 2F and the front (abdominal) ends of the tapes 2L, 2R overlap with the region D2 in the thickness direction, the diaper 1 is easily folded toward the non-skin side in front of the front ends. In this way, when the top sheet 7 and the back sheet 5 in the worn state of the diaper 1 are folded toward the non-skin side in the region D2, the SAP particles can be blocked at the folded portion.

[0033] Furthermore, the waist sheets 9F, 9R have a thickness larger than the average particle size of the SAP particles. For example, the average particle size of the SAP particles is 0.3 to 0.4 mm, and the waist sheets 9F, 9R are thicker than 0.4 mm, for example, about 1 mm to 1.5 mm. Even if the SAP particles move into the SAP storage space, the SAP storage space is located between the absorbent body 6 and the waist sheets 9F, 9R, and therefore the thickness of the absorbent body 6 and the waist sheets 9F, 9R can prevent the SAP in the SAP storage space from coming into contact with the wearer's skin surface via the top sheet 7. This makes it possible for the diaper 1 to prevent the SAP particles that have moved into the SAP storage space from feeling thick and giving a foreign body sensation to the wearer.

[0034] Furthermore, when the distances D1, D2 between the absorbent body 6 and the waist sheets 9F, 9R are 10 mm or less, the skin of the wearer's abdomen and back is curved, so that the skin is unlikely to come into contact with the top sheet 7 above the SAP storage space, and the SAP does not give a foreign body sensation to the skin even when body pressure is applied to the diaper 1. By setting the absorbent body 6 and the waist sheets 9F, 9R to a thickness of 1 mm or more, the wearer's skin comes into contact with the absorbent body 6 and the waist sheets 9F, 9R, and the wearer's skin is prevented from coming into contact with the SAP in the SAP storage space. Therefore, the diaper 1 can prevent the wearer from feeling uncomfortable due to contact with SAP particles.

[0035] Moreover, each distance D1, D2 between the absorbent body 6 and the waist sheets 9F, 9R in the longitudinal direction of the diaper 1 is preferably at least twice the average particle size of the SAP particles. More preferably, each distance D1, D2 is at least 10 times the average particle size of the SAP particles. When the SAP particles fall off the lower SAP layer 60B and the upper SAP layer 60D and a space for storing SAP is formed between the top sheet 7 and the back sheet 5, by setting each distance between the absorbent body 6 and the waist sheets 9F, 9R as described above, it is possible to prevent the force of the SAP particles peeling the top sheet 7 and the back sheet 5 from acting on the adhesion between the waist sheets 9F, 9R and the top sheet 7 and the back sheet 5. Therefore, the diaper 1 can prevent the waist sheets 9F, 9R from peeling off the top sheet 7 and the back sheet 5, and suppress leakage of the SAP particles.

[0036] In addition, the waist sheet 9F on the front body region 1F side does not have contractility. Therefore, in the front body region 1F side, the core wrap sheet 6W is not subjected to a contraction force in the width direction, and the core wrap sheet 6W is prevented from opening in the thickness direction. In addition, when a contraction force is applied to the absorbent 6, the SAP particles are likely to fall off from the lower SAP layer 60B and the upper SAP layer 60D, but in the front body region 1F side, the absorbent 6 is not subjected to a contraction force, and the SAP particles are less likely to fall off.

[0037] The crotch region side of the waist sheet 9F and the back sheet 5 may be weakly bonded or not bonded at all. This forms a space for storing SAP between the crotch region side of the waist sheet 9F and the back sheet 5, and when SAP particles are stored in the space, the waist sheet 9F is disposed closer to the skin than the space, thereby reducing the contact with the skin (foreign body sensation) of the SAP particles in the space. As described above, the top sheet 7 and the back sheet 5 are folded toward the non-skin side in the region within D2 when worn, thereby further reducing the contact with the skin of the SAP particles in the space.

[0038] As shown in Fig. 4, the three-dimensional gathers 3BL, 3BR formed by the contractile force of the contractile members 8EL, 8ER of the side sheets 8L, 8R are arranged along the widthwise edge of the top sheet 7 and extend in the longitudinal direction of the diaper 1. The insides of the side sheets 8L, 8R in the widthwise direction are not bonded to the top sheet 7, and the inside edges in the widthwise direction become free ends 8AL, 8AR to form the three-dimensional gathers 3BL, 3BR standing up on the skin-facing side. The side sheets 8L, 8R have joints 8BL, 8BR at which the outer sides in the width direction of the diaper are joined to the sheets arranged on the non-skin-facing side. Specifically, the joints 8BL, 8BR are areas that are bonded to the top sheet 7, back sheet 5, and cover sheet 4 arranged on the non-skin-facing side by hot melt adhesive. The inner ends in the width direction of the diaper at the joints 8BL, 8BR become the fold lines 30L, 30R that become the standing ends in the width direction of the three-dimensional gathers 3BL, 3BR. The joints 8BL, 8BR are joints that form the fold lines 30L, 30R because the ends in the width direction become the fold lines 30L, 30R. The side sheets 8L, 8R are not bonded to the top sheet 7 on the inner side of the fold lines 30L, 30R. As a result, when the diaper 1 is worn, the diaper 1 is stretched in the longitudinal direction, and the contractile force of the contractile members 8EL, 8ER provided on the side sheets 8L, 8R causes the inner sides of the fold lines 30L, 30R of the side sheets 8L, 8R to rise towards the skin side, forming three-dimensional gathers 3BL, 3BR.

[0039] When the three-dimensional gathers 3BL, 3BR are raised, the fixed parts 31L, 31R (one example of the "pair of front and rear fixed parts" of the present disclosure) are formed as the raised ends in the longitudinal direction of the diaper 1. In FIG. 4, the fixed parts 31L, 31R are illustrated as being filled in. The fixed parts 31L, 31R are formed on both ends of the diaper 1 in the longitudinal direction, inside the fold lines 30L, 30R in the width direction of the diaper 1. The fixed parts 31L, 31R are formed on both sides of the front body region 1F and the back body region 1R, and each fixed part 31L, 31R is disposed across the absorbent body 6 and the waist sheets 9F, 9R when viewed in the thickness direction. The fixed parts 31L, 31R are formed by applying a hot melt adhesive between the non-skin facing sides of the side sheets 8L, 8R and the top sheet 7. The side sheets 8L, 8R are also fixed to the top sheet 7 by fixing portions 31L, 31R.

[0040] Here, there is no non-adhesive region between the fixing parts 31L, 31R and the layers between the top sheet 7 and the absorbent body 6, and between the top sheet 7 and the waist sheet 9F, 9R. The "between layers" refers to the between the sheets, and the top sheet 7 and the absorbent body 6, and the top sheet 7 and the waist sheet 9F, 9R are adhered to the non-skin-facing side of the fixing parts 31L, 31R. The fixing parts 31L, 31R increase the rigidity of the longitudinal end side of the absorbent body 6. In addition, since the fixing parts 31L, 31R are arranged across the waist sheet 9F, which has no contractile force, contraction of the absorbent body 6 is also suppressed on the front body region 1F side, and therefore, on the front side of the absorbent body 6, it is possible to suppress the SAP particles from falling off the lower SAP layer 60B and the upper SAP layer 60D. Furthermore, even if the fixing parts 31L, 31R are disposed across the waist sheet 9R having a contractile force, the rigidity of the absorbent body 6 on the rear body region 1R side can be increased, thereby preventing the rear end of the absorbent body 6 from twisting. Note that, in order to prevent the absorbent body 6 from twisting, the fixing parts 31L, 31R are preferably formed so as to overlap the absorbent body 6 on the end side in the width direction of the absorbent body 6.

[0041] Furthermore, even if the SAP particles leak outside the fold lines 30L, 30R and penetrate between the side sheets 8L, 8R and the top sheet 7 or the back sheet 5, the SAP can be contained in the SAP containing space and the waist sheets 9F, 9R can prevent the SAP particles from leaking to the outside.

[0042] As shown in FIG. 4, the top sheet 7 has embossed grooves 20 formed in a diagonal lattice pattern. The embossed grooves 20 are formed by embossing the top sheet 7 (3D embossing). The top sheet 7 may be formed by laminating two nonwoven fabric sheets, and the embossed grooves 20 may be formed by embossing these two nonwoven fabric sheets. The top sheet 7 may be formed by a single nonwoven fabric sheet, and the embossed grooves 20 may be formed by embossing this nonwoven fabric sheet. With the embossed grooves 20 formed in the top sheet 7 of the diaper 1, the SAP particles contained in the lower SAP layer 60B and upper SAP layer 60D of the absorbent body 6 and the SAP particles contained in the flow guide layer 6 This makes it difficult for the wearer to feel particles such as OA or SAP particles that have fallen off from the diffusion layer 60E, and thus suppresses deterioration in the wearing comfort.

[0043] Next, the rear body region 1R of the diaper 1 according to this embodiment will be described with reference to Fig. 7. Fig. 7 is a view showing only the rear body region of the diaper according to this embodiment in a stretched state. Note that Fig. 7 shows the state in which the tape 2L is folded.

[0044] The diaper 1 according to this embodiment includes a sheet region 11, which is located behind the absorbent body 6 and is formed without the absorbent body and includes the top sheet 7 and the back sheet 5. The sheet region 11 is an area formed by the sheet materials of the top sheet 7, the back sheet 5, the waist sheet 9R and the cover sheet 4. A contraction member 9ER is disposed in the sheet region 11. In this embodiment, the contraction member 9ER is rubber thread, and a plurality of rubber threads as the contraction members 9ER are provided in a stretched state in the width direction of the diaper 1.

[0045] Here, the contraction member 9ER is divided into a contraction member 9ER1 (an example of a "first contraction member" in the present disclosure) disposed relatively to the rear side of the diaper 1, and a contraction member 9ER2 (an example of a "second contraction member" in the present disclosure) disposed relatively to the front side of the diaper 1. The contraction member 9ER1 is a contraction member for forming a waist gather 3R. The waist gather 3R contracts the rear waist circumference of the diaper 1 in the width direction when worn, and fits the diaper 1 closely to the waist circumference of the wearer.

[0046] The contraction member 9ER2 is provided in the sheet region 11, and is fixed in a stretched state to the top sheet 7 and the back sheet 5 via the waist sheet 9R. In addition, the extension region of the contraction member 9ER2 is provided with a contraction force non-working region 13 in which the contraction member 9ER2, whose contraction force acts directly on neither the top sheet 7 nor the back sheet 5, is not present. The contraction force non-working region 13 is an area in which the contraction force of the contraction member 9ER extending within the region does not act, and the region does not contract due to this contraction force. The contraction member 9ER2 is bonded to the waist sheet 9R, and in the contraction force non-working region 13, the waist sheet 9R is not bonded to the top sheet 7 and the back sheet 5. Therefore, in the contraction force non-working region 13, the contraction member 9ER2 is not bonded to the top sheet 7 and the back sheet 5, and the region is an area in which the contraction member 9ER2, whose contraction force acts directly, is not present.

[0047] The non-contractile region 13 is provided so that its longitudinal direction extends in the width direction of the diaper 1, centered at the center in the width direction of the diaper 1. On both left and right sides of the non-contractile region 13, contractile members 9ER2 are fixed to the top sheet 7 and the back sheet 5 via the waist sheet 9R, and a pair of side gathers 12L, 12R (one example of the "side contractile portion" of the present disclosure) that contract in the width direction of the diaper 1 on both left and right sides of the sheet region 11 due to the contractile force of the contractile member 9ER2 are formed.

[0048] In the diaper 1 according to the present embodiment, the contraction member 9ER1 contracts, causing the waist gather 3R to adhere closely to the wearer's waist, and thus the diaper 1 is fixed to the wearer. If the contraction member of the waist gather is arranged close to the absorbent body, and the absorbent body 6 contracts due to the contraction force of the contraction member, causing the absorbent body to lose its shape, the absorbent body's contact with the skin will deteriorate. Furthermore, there is a risk that the absorbent material such as pulp or SAP in the absorbent body will become uneven, causing the amount of absorbent material to become relatively small and causing liquid such as urine to leak from the portion where the amount of absorption is insufficient. Therefore, the diaper 1 according to the present embodiment provides a contraction force non-acting region 13 between the contraction member 9ER1 and the absorbent body 6, which suppresses the contraction force of the contraction member 9ER1 from acting on the absorbent body 6 and suppresses the absorbent body 6 from losing its shape. As a result, the diaper 1 suppresses the SAP in the absorbent body 6 from becoming uneven, and also suppresses the leakage of liquid such as urine. Furthermore, the diaper 1 suppresses the absorbent body 6 from losing its shape, and prevents the absorbent body 6 from becoming unevenly contacted with the skin.

[0049] Furthermore, since the contraction member 9ER2 extends into the contraction non-operating region 13, the contraction force of the contraction member 9ER2 presses the top sheet 7 against the wearer's skin. This allows the diaper 1 to block excrement in the contraction non-operating region 13 and prevent excrement from leaking from the back side. The diaper 1 prevents the contraction forces of the contraction members 9ER1, 9ER2 from acting on the absorber 6 while bringing the top sheet 7 in the contraction non-operating region 13 into close contact with the skin, thereby preventing excrement from leaking.

[0050] Furthermore, the corrective force of the contractile member 9ER2 acts to press the top sheet 7 against the skin, but does not act to press the sheet material on the non-skin-facing side of the waist sheet 9R against the skin, so that a space can be formed between the back sheet 5 on the non-skin-facing side of the waist sheet 9R and the top sheet 7. The diaper 1 can temporarily store urine in this space and sequentially absorb this urine with the absorbent 6. Therefore, the diaper 1 can prevent urine leakage even when a large amount of urine flows toward the rear body region 1R.

[0051] In addition, it is preferable that the degree of contraction of the contraction member 9ER2 is equal to or greater than the degree of contraction of the contraction member 9ER1. Here, the degree of contraction can be calculated by dividing the natural length of the contraction member by the length of the contraction member when fixed to the sheet. The following formula (1) is used to calculate the degree of contraction. Shrinkage rate = (natural length of shrinkage member) / (length of shrinkage member when fixed to sheet) (1)

[0052] Since the entire contraction member 9ER1 is fixed to the back sheet 5 and the cover sheet 4 via the waist sheet 9R, the contraction member 9ER1 contracts together with the back sheet 5 and the cover sheet 4 when the diaper 1 is not worn or is being worn. On the other hand, the contraction member 9ER2 is not attached to the waist sheet 9R in the contraction force non-acting region 13. Since the absorbent 6, which has a relatively high rigidity, is disposed in front of the contraction member 9ER2 (the crotch region 1B side), the contraction force non-acting region 13 contracts slightly due to the contraction force of the contraction member 9ER1, but hardly at all. Therefore, when the diaper 1 is not worn, the contraction member 9ER2 moves closer to the contraction member 9ER1, which is more contracted, but when the diaper 1 is worn, the contraction member 9ER1 is stretched, so that the contraction member 9ER2 moves closer to the front side (the crotch region 1B side). That is, as the contraction member 9ER2 moves from the rear side to the front side when the diaper 1 is put on, the contraction force non-acting region 13 including the contraction member 9ER2 presses against the crotch region 1B side of the contraction force non-acting region 13. This enables the diaper 1 to prevent the formation of spaces between the contraction force non-acting region 13 and the crotch region 1B of the contraction force non-acting region 13 and the wearer's skin.

[0053] In addition, in this embodiment, a plurality of contraction members 9ER2 are provided in the longitudinal direction of the diaper 1, spaced apart from each other. When the diaper 1 is put on, the plurality of contraction members 9ER2 move toward the crotch region 1B, thereby preventing the crushed crotch region 1B side of the contraction force non-acting region 13 from expanding again toward the non-skin side. If a planar contraction member is used to press the entire diaper, wrinkles that have already formed may remain in the front and rear of the contraction force non-acting region 13. If wrinkles occur around the waist gathers in the diaper, liquid may leak out from gaps created by the wrinkles. On the other hand, in this embodiment, linear rubber threads are used as the contraction members 9ER2. Since the plurality of contraction members 9ER2 move independently toward the crotch region 1B, the sheet in the contraction force non-acting region 13 is stretched by the plurality of contraction members 9ER2, making it difficult for wrinkles to occur in the front and rear. This allows the diaper 1 to prevent liquid from leaking out from wrinkles.

[0054] In addition, the waist gather 3R and the side gathers 12L and 12R of the diaper 1 are shrinkable. By doing so, the diaper 1 fits closely to the wearer's skin. Even if liquid such as urine temporarily accumulates on the non-skin facing side of the non-contraction force acting region 13, the diaper 1 can prevent the accumulated liquid from leaking out by surrounding the non-contraction force acting region 13 with the waist gathers 3R and the side gathers 12L, 12R. In this way, the diaper 1 according to this embodiment can temporarily collect liquid such as watery stool or urine that has flowed behind the absorbent body 6, and can prevent the liquid from leaking. The diaper 1 according to this embodiment can prevent leakage of excrement.

[0055] 7, the rear fixed parts 31L, 31R are provided on the rear side of the diaper 1 relative to the non-contractile region 13. With this configuration, the three-dimensional gathers 3BL, 3BR stand upright in the left-right direction of the non-contractile region 13 in the diaper 1, and thus can block excrement such as urine and watery stool that leaks outward in the width direction from the non-contractile region 13. Thus, the diaper 1 can prevent lateral leakage of excrement. In addition, in the longitudinal direction of the diaper 1, the three-dimensional gathers 3BL, 3BR stand upright from the fixed parts 31L, 31R, and thus the three-dimensional gathers 3BL, 3BR stand upright on the width direction outer side of the non-contractile region 13. When the rear fixing parts 31L, 31R are provided so as to partially overlap the non-contraction region 13, the front end parts of the fixing parts 31L, 31R become the folding starting points of the non-contraction region 13, forming spaces on the non-skin side of the non-contraction region 13, and allowing the three-dimensional gathers 3BL, 3BR to stand up from the skin side of the spaces. This configuration also enables the diaper 1 to prevent body excrement from leaking from the back.

[0056] Moreover, the side gathers 12L, 12R are provided on the outer side in the width direction of the diaper 1 than the fold lines 30L, 30R which are the rising ends in the width direction of the three-dimensional gathers 3BL, 3BR. With this configuration, the diaper 1 can arrange the rising ends in the width direction of the three-dimensional gathers 3BL, 3BR at the left and right ends of the contraction force non-acting region 13, and the contraction of the side gathers 12L, 12R can press the three-dimensional gathers 3BL, 3BR against the wearer's skin. Therefore, the diaper 1 can make the three-dimensional gathers 3BL, 3BR rise toward the skin, thereby suppressing side leakage of excrement.

[0057] The length of the non-contraction-force-exposed region 13 in the longitudinal direction of the diaper 1 is preferably 15 mm or more and 45 mm or less. The length of the non-contraction-force-exposed region 13 in the longitudinal direction can be determined based on the basis weight of the nonwoven fabric. For example, as the basis weight of the nonwoven fabric increases, the thickness of the nonwoven fabric also increases, and the space formed on the non-skin-facing side becomes smaller due to the thickness of the nonwoven fabric. Therefore, the basis weight of the waist sheet 9R is set to 8 to 25 g / m2. 2If the basis weight falls within this range, the length of the non-contractile region 13 in the longitudinal direction of the diaper 1 is preferably within the above-mentioned range.

[0058] In addition, in the contraction force non-working region 13, at least one of the sheets stacked in the thickness direction is not bonded to each other. In this embodiment, the waist sheet 9R is not bonded to the top sheet 7 and the back sheet 5. With this configuration, no adhesive is applied to at least one of the non-skin-facing side and the skin-facing side of the waist sheet 9R in the contraction force non-working region 13, so the rigidity of the contraction force non-working region 13 is relatively smaller than that of the surrounding area. As a result, even if the contraction force of the contraction member 9ER1 acts on the contraction force non-working region 13, wrinkles generated in the contraction force non-working region 13 can be made fine, and the extension range of these wrinkles can be shortened. By shortening the extension range of the wrinkles, the diaper 1 can suppress leakage of excrement through these wrinkles. In addition, the diaper 1 can press the top sheet 7, which is relatively soft to the touch, against the skin surface, improving the wearing comfort.

[0059] <Other embodiments> Although the present embodiment has been described above, the content of the present invention is not limited to the above embodiment. In the above embodiment, a tape-type disposable diaper has been described as an example, but the present invention is not limited thereto, and the present invention is also applicable to absorbent articles such as absorbent pads and pants-type disposable diapers.

[0060] For example, even in a pants-type diaper, by providing the non-contraction-force acting region 13 and the side gathers 12L, 12R in front of the waist gathers in the rear body region, the non-contraction-force acting region 13 can be expanded toward the non-skin surface, thereby forming a space between the non-contraction-force acting region 13 and the skin surface. This allows the pants-type diaper to suppress leakage of excrement.

[0061] In the above embodiment, the configuration of the diaper 1 is described in which the contraction force non-acting region 13 is provided in the rear body region 1R to prevent excrement from leaking from the rear side, but the present invention is not limited to this. The diaper 1 can prevent excrement from leaking from the front side by providing a contraction force non-acting region in the front body region 1F, providing waist gathers in front of the contraction force non-acting region, and providing side gathers on the left and right sides of the contraction force non-acting region. For example, pants-type diapers have waist gathers on the front and back, so a contraction force non-acting region can be provided on the front side. Note that a tape-type diaper may also have a contraction force non-acting region on the front body region 1F side.

[0062] The features included in each of the embodiments and the modified examples thereof disclosed above can be combined with each other. [Explanation of symbols]

[0063] 1. Diapers 1B...Inseam area 1F: Front body area 1R: Back body area 2L, 2R Tape 2F: Front patch 3BL, 3BR... Contraction material 3L, 3R: 3D gathers 4. Cover sheet 5. Back sheet 6. Absorber 6C··Absorbent core 6W··Core wrap sheet 7. Top sheet 8R, 8L··Side seat 8EL, 8ER... Contraction material 9F, 9R West Seat 9ER Contraction material 11. Sheet area 12L, 12R: Side gathers 13. Contraction force non-acting area 20 Embossed groove 30L, 30R ·· Folding line 31L,31R·Fixed part 60A･･･Driving layer 60B··Bottom SAP layer 60C··Base 60D··Upper SAP layer 60E··Breaking layer

Claims

1. A length along a longitudinal direction corresponding to the front-to-back direction of the wearer; A length along a width direction perpendicular to the longitudinal direction; In the front-to-rear direction, a front body region located in front of the wearer, a rear body region located behind the wearer, and a crotch region located between the front body region and the rear body region; An absorbent disposed at least in the crotch region; An upper sheet disposed on the skin side of the absorbent body; A lower sheet disposed on the non-skin facing side of the absorbent body; a sheet area provided in front of or behind the absorbent body, the sheet area being formed including the upper sheet and the lower sheet without the absorbent body being present; a waistline contraction portion that is formed at a position spaced apart from the front end portion or the rear end portion of the absorbent body, has a first contraction member that is provided in a stretched state in the width direction, and contracts in the width direction around at least a portion of the waistline of the wearer; a contraction force non-action region provided in at least a portion of the sheet region, the contraction force non-action region including a second contraction member extending in the width direction without being bonded to the upper sheet and the lower sheet, in which the contraction force of the second contraction member does not act; a pair of side contraction sections provided at least on both the left and right sides of the seat area, the side contraction sections including the second contraction member fixed in a stretched state to at least one of the upper sheet or the lower sheet, and contracting in the width direction on both the left and right sides of the seat area; An absorbent article comprising:

2. The degree of contraction of the second contraction member is equal to or greater than the degree of contraction of the first contraction member. The absorbent article of claim 1.

3. The second contraction member is a linear contraction member, A plurality of the second contraction members are provided spaced apart from each other in the longitudinal direction. The absorbent article according to claim 1 or 2.

4. A pair of left and right leak-proof sheets are disposed on both sides of the upper sheet in the width direction and extend in the longitudinal direction, The leak-proof sheet is a leak-preventing wall having an inner side in the width direction that is not bonded to the upper sheet and an inner end portion in the width direction that is a free end and stands on the skin side; a third contraction member provided on the leak preventing wall in a stretched state in the longitudinal direction; a joint portion that is provided on the outer side of the leak preventing wall in the width direction and that is joined to the upper sheet to form a standing end of the leak preventing wall in the width direction; a pair of front and rear fixing parts that are provided on both outer sides of the leak preventing wall in the longitudinal direction and form upstanding ends in the longitudinal direction when the leak preventing wall stands up; having The fixing portion is provided on the end side in the longitudinal direction relative to the contraction force non-action region. The absorbent article according to claim 1 or 2.

5. The length of the contraction force non-acting region in the longitudinal direction is 15 mm or more and 45 mm or less. The absorbent article according to claim 1 or 2.

6. In the contraction force non-acting region, at least one of the sheets laminated in the thickness direction is not bonded to each other. The absorbent article according to claim 1 or 2.

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