Disposable shorts-type clothing

Abstract

The above problem is solved by a shorts-type disposable diaper characterized by having a back barrier (70) that is unfolded in a natural length and automatically rolled up when stretched.

Description

Technical Field

[0001] The present invention relates to a shorts-type disposable wearing article with a back leakage prevention function. Background Art

[0002] Disposable shorts-type wearable articles such as shorts-type disposable diapers and shorts-type sanitary products have widthwise stretchability in the waist area, which makes it difficult for a gap to form between the wearer's back and the diaper, so it is difficult for urine and other excretions to leak from the back side (so-called back leakage).

[0003] For example, a typical shorts-type disposable diaper comprises an outer body that forms at least a waist portion of the front body and a waist portion of the back body; and an inner body including an absorbent body, which is attached to the outer body in a manner extending from the front body to the back body. The side edges of the outer body of the front body are joined to the side edges of the outer body of the back body to form side seals, thereby forming a waist opening and a pair of left and right leg openings. Furthermore, elastic components are provided on the outer body in a waist region defined as a front-to-back range having the side seals (the front-to-back range from the waist opening to the upper ends of the leg openings), thereby adding widthwise stretchability. In addition to using elongated elastic components such as rubber threads, it is also known to use elastic films as elastic components. (See, for example, Patent Documents 1-2).

[0004] Due to this high level of back leakage prevention, some users actively use shorts-type disposable clothing articles during long periods of sleep, such as at night. Given this usage pattern, even shorts-type disposable clothing articles are naturally desired to be equipped with a back barrier. Therefore, proposals have long been made to provide shorts-type disposable clothing articles with a back barrier (see, for example, Patent Document 1).

[0005] However, conventional shorts-type disposable wearing articles equipped with back barriers are sometimes used with the back barrier in a collapsed state. Specifically, the back barrier is installed in a flat, tilted position during manufacture, and is not only compressed in the thickness direction, but also remains compressed in this direction until use. Consequently, even during use, the upright portion may remain in a tilted position, weakly attached to the opposing surface. Therefore, if this condition is not observed and the product is used, the leak-proof function may be inadequate. Therefore, it is desirable to immediately erect the back barrier during use.

[0006] In addition, pad-type absorbent articles are sometimes placed on the inner surface of shorts-type disposable wearable articles for use. In this case, if the back barrier is in a flat and tilted state, there is a concern that the pad-type absorbent article may be mistakenly placed on the back barrier, and the back barrier may not function.

[0007] Prior art literature

[0008] Patent Literature

[0009] Patent Document 1: Japanese Patent Application Laid-Open No. 2001-252303

[0010] Patent Document 2: Japanese Patent Application Laid-Open No. 2013-75106 Summary of the Invention

[0011] Problems to be solved by the invention

[0012] Therefore, a main object of the present invention is to provide a shorts-type disposable wearing article in which a back barrier can be raised unconsciously during use.

[0013] Means for solving problems

[0014] The shorts-type disposable wearing article that has solved the above-mentioned problems is as follows.

[0015] <Method 1>

[0016] A shorts-type disposable wearing article, characterized in that the shorts-type disposable wearing article comprises: an outer body extending from the front to the back portion as a whole, or outer bodies provided separately in the front and back portions; an inner body extending from the front to the back portion, which is attached to the middle of the outer body in the width direction; side seals formed by joining the two side portions of the outer body in the front portion and the two side portions of the outer body in the back portion; a waist opening and a pair of left and right leg openings; and a back barrier provided at the back portion. The back barrier has a first blocking position for blocking the movement of excrement to the rear and a second blocking position for blocking the movement of excrement to both sides in the width direction at a position closer to the waist opening than the crotch portion, and the back barrier has a barrier sheet extending from the front side of the first blocking position to the rear side with a width wider than the first blocking position, and the barrier sheet has: a base portion adjacent to the rear side of the first blocking position; and a main portion adjacent to the front side of the first blocking position, the base portion being fixed to the front side of the back body portion, and the main portion having : two side portions adjacent to the outer side of the second blocking position; and an intermediate portion located between the second blocking position, the two side portions of the main portion having: a first portion extending toward the front side of the first blocking position; a second portion folded back toward the front side at a bending position along the front edge of the first portion and then extending toward the rear side; and a third portion folded back toward the front side at a bending position along the rear edge of the second portion and then extending toward the front side, the back side of the first portion being fixed to the front side of the back body portion, and the back side of the second portion being fixed to The front side of the first part, the third part is not fixed to the second part, the middle part of the main part is not fixed to the front side of the back part, the shorts-type disposable wearing article is provided with a slender barrier elastic component, the barrier elastic component extends from the third part on one side of the main part to the third part on the other side in the width direction, the barrier elastic component is not provided at the rear end part of the third part, and in a natural length state, the main part and the barrier elastic component elastically shrink in the width direction together.

[0017] (Effect)

[0018] The back barrier of this shorts-type disposable wearable article has a unique folded structure and arrangement of barrier elastic components. As a result, when in its natural length, the main portion of the barrier sheet has a fold from the first portion to the second portion, and a fold from the second portion to the third portion, on both sides. However, in the intermediate portion between these folds, the folds gradually expand forward as they move toward the widthwise center. At the widthwise center, the folds are partially expanded forward, or fully expanded forward (the first state).

[0019] The reason for this is uncertain, but it is believed that the middle portion of the main section, which includes the barrier elastic component, is a free, unfixed portion, and the barrier elastic component is only provided at a position away from the rear edge of the third section. Therefore, when the middle portion of the main section elastically contracts together with the barrier elastic component, the third section freely tilts toward the center in the width direction. This reduces the component of the force applied to the middle portion of the main section by the elastic contraction force of the barrier elastic component that causes the middle portion of the main section to fold back in the same direction as the two side sections. Furthermore, it is believed that the expansion of the middle portion of the main section is influenced by the formation of contraction wrinkles extending in the front-to-back direction throughout the entire middle portion of the main section, resulting in increased rigidity (making it difficult to bend in the front-to-back direction).

[0020] On the other hand, when worn, if the main part of the barrier sheet is stretched in the width direction together with the elastic part of the barrier, then at both sides of the main part, the folding from the first part to the second part is maintained, and the folding from the second part to the third part is also maintained to a certain extent. However, in the middle part of the main part, the part (hereinafter also referred to as the rotating part) that is closer to the end side of the imaginary line along the width direction passing through the boundary (folding position) between the first part and the second part rotates toward the rear side with the imaginary line as the center (second state).

[0021] The reason for this is uncertain, but it's thought to be because the barrier elastic member is stretched in a nearly straight line along the width direction. This increases the component of the force applied to the middle portion of the main section by the elastic contraction of the barrier elastic member that causes it to fold back in the same direction as the two side portions. Meanwhile, the third portion is not fixed throughout the entire width direction, making the folding force less effective. The degree of this rotation can be adjusted appropriately by adjusting the placement of the barrier elastic member, for example, to allow the barrier to slightly rise from its natural length or to tilt back toward the rear (toward the waist opening) in the opposite direction of its natural length.

[0022] Furthermore, as can be seen from the changes between the first and second states described above, in the somewhat contracted wearing state, the central portion of the main section is not fixed to the front of the back section, and the base section located at the rear and the two side portions of the main section located on either side thereof are directly or indirectly fixed to the front of the back section. Therefore, a pocket opening toward the crotch is formed between the central portion of the main section and the front of the back section. Therefore, the movement of excrement entering this pocket toward the rear and sides is blocked.

[0023] As described above, in the present shorts-type disposable wearing article, since the back barrier changes as in the above-mentioned first state, second state and wearing state, the back barrier automatically stands up during use, and it is less likely to occur that the back barrier is directly used in a crushed state or that a pad-type absorbent article is mistakenly placed on the back barrier.

[0024] <Method 2>

[0025] According to the first embodiment of the shorts-type disposable wearing article, the width dimension of the middle portion of the main portion is 180 mm to 200 mm, the front-to-back dimension of the second portion is 5 mm to 25 mm, the front-to-back dimension of the third portion is 10 mm to 35 mm, the elongation of the third portion at maximum elongation in the width direction is 180% to 280%, and the distance between the rear edge of the third portion and the elastic component of the barrier member in the front-to-back direction is 3 mm to 20 mm.

[0026] (Effect)

[0027] The dimensions of each part of the barrier sheet can be appropriately determined, but if it is within the scope of this method, when the third part is stretched to more than 0.4 times the maximum stretch rate, the angle of the aforementioned rotating part relative to the front of the back part is about 90 degrees, and when it is stretched to more than 0.6 times the maximum stretch rate, the rotating part tilts toward the back side (waist opening side), so it is preferred.

[0028] <Method 3>

[0029] According to the first or second embodiment, the shorts-type disposable wearing article is provided with at least one of the following slender shaping elastic components: a slender shaping elastic component extending in the width direction from the second part of one side of the main part to the second part of the other side; a slender shaping elastic component extending in the width direction from the first part of one side of the main part to the first part of the other side; and a slender shaping elastic component extending in the width direction over both sides of the base part, wherein in a state of natural length, the main part and the shaping elastic component elastically contract in the width direction together.

[0030] (Effect)

[0031] In this embodiment, in addition to the barrier elastic component passing through the third part, a shaping elastic component passing through the first part, the second part and at least one of the base parts is also provided. As a result, not only the shape of the back barrier is neat, but also the middle part of the main part is easy to unfold in a natural length state, which is preferred.

[0032] <Method 4>

[0033] The shorts-type disposable wearing article according to any one of items 1 to 3, wherein the inner body has an absorbent body provided in a range including the crotch portion, and has a waist stretch region that elastically contracts in the width direction within a range in the front-to-back direction of the outer body having the side seals, and has a non-stretch region in the middle in the width direction of a region of the outer body overlapping with the absorbent body, the waist stretch region has a portion adjacent to the waist opening side of the rear end of the absorbent body, and the base of the barrier sheet is fixed to a portion of the waist stretch region adjacent to the waist opening side of the rear end of the absorbent body and can stretch and contract together with the waist stretch region.

[0034] (Effect)

[0035] Many shorts-type disposable wearable articles with absorbent bodies have a waist stretch zone, as in this embodiment. This stretch zone can be used to firmly press the rear end of the absorbent body and its vicinity against the wearer's skin. Furthermore, the stretch zone is often not provided in the portion of the outer body that overlaps the absorbent body. This embodiment utilizes this waist stretch zone. Specifically, if the base portion of the barrier sheet is fixed to the portion of the waist stretch zone adjacent to the waist opening at the rear end of the absorbent body, and is configured to stretch along with the waist stretch zone, not only does the shape of the back barrier sheet remain regular, but the central portion of the main body is also more easily expanded when in its natural length.

[0036] <Method 5>

[0037] The pants-type disposable wearing article according to any one of the first to fourth aspects, wherein at least the middle portion of the main portion of the barrier sheet has different colors, patterns, or displays on the front and back sides.

[0038] (Effect)

[0039] In this embodiment, the user can easily recognize the automatic deformation of the back barrier member (the change between the first state and the second state). Therefore, when the present shorts-type disposable wearing article is placed on the inner surface of the article, the user can easily visually confirm the correct wearing position of the article.

[0040] Effects of the Invention

[0041] As described above, according to the present invention, there is an advantage such as that the back barrier can be raised unconsciously during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1It is a top view (inner surface side) of the pants-type disposable diaper in the unfolded state.

[0043] Figure 2 It is a top view (outer surface side) of the pants-type disposable diaper in the unfolded state.

[0044] Figure 3 The back side barrier is removed and the Figure 1 Cross-sectional view of line 1-1.

[0045] Figure 4 1 and 2 are views showing a back barrier portion in an expanded state, wherein (a) is a top view, (b) is a cross-sectional view taken along line 5-5 in (a), and (c) is a cross-sectional view taken along line 6-6 in (a).

[0046] Figure 5 It is along Figure 1 Cross-sectional view of line 2-2.

[0047] Figure 6 It is along Figure 1 Cross-sectional view along line 3-3.

[0048] Figure 7 This is a perspective view of a shorts-type disposable diaper when being worn.

[0049] Figure 8 It is along Figure 1 Cross-sectional view of line 4-4.

[0050] Figure 9 1 and 2 are views showing a back barrier portion in a state of natural length, wherein (a) is a top view, (b) is a cross-sectional view along line 5-5 in (a), and (c) is a cross-sectional view along line 6-6 in (a).

[0051] Figure 10 It is a cross-sectional view showing changes of main parts during wearing.

[0052] Figure 11 It is a perspective view showing the stretched state during wearing.

[0053] Figure 12 This is a cross-sectional view showing another example with the back-side barrier removed.

[0054] Figure 13 It is a top view (inner surface side) of the pants-type disposable diaper in the unfolded state.

[0055] Figure 14 It is along Figure 13 Cross-sectional view of line 1-1.

[0056] Figure 15 1 is a top view showing the back barrier portion in the deployed state.

[0057] Figure 16 This is a cross-sectional view showing changes in the main parts during conventional wearing. DETAILED DESCRIPTION

[0058] Hereinafter, an example of a shorts-type disposable diaper will be described in detail with reference to the accompanying drawings. In addition, the dot pattern portion in the figure represents an adhesive as a joining means for joining together the components located on the front and back sides thereof, which is formed by applying a hot melt adhesive to the entire surface, linearly, curtain-like, at key locations, or spirally, or pattern-like (transfer of a hot melt adhesive in relief printing), or the fixing portion of the elastic component is formed by applying the adhesive to the outer peripheral surface of the elastic component by a coating gun or gluing, etc., instead of or together with the adhesive. As hot melt adhesives, there are, for example, EVA-based, adhesive rubber-based (elastic system), olefin-based, polyester / polyamide-based adhesives, and the like, which can be used without particular limitation. As a joining means for joining the components, a means based on material welding, such as heat sealing or ultrasonic sealing, can also be used.

[0059] Figures 1 to 7 The figure shows a shorts-type disposable diaper. This shorts-type disposable diaper (hereinafter also referred to as a diaper) comprises: an outer body 20 that is an integral body extending from the front body F to the back body B; and an inner body 10 that is fixed to the inner surface of the outer body 20 in a manner extending from the front body F to the back body B. The inner body 10 is formed by sandwiching an absorbent body 13 between a liquid-permeable top sheet 11 and a liquid-impermeable sheet 12. During manufacturing, the back surface of the inner body 10 is joined by a hot melt adhesive or other joining means ( Figure 2 After the inner body 10 and the outer body 20 are folded at the boundary between the front body portion F and the back body portion B, that is, at the center in the front-to-back direction LD (longitudinal direction), the two sides are joined together by heat welding or hot melt adhesive to form side seals 21. This creates a shorts-type disposable diaper having a waist opening and a pair of left and right leg openings. The outer body 20 can also be provided separately on the front body portion F and the back body portion B.

[0060] (Structural example of inner body)

[0061] like Figures 4 to 6 As shown, the inner body 10 has a structure in which an absorbent body 13 is interposed between a top sheet 11 and a liquid-impermeable sheet 12, and the absorbent body 13 absorbs and retains the excretion liquid that has passed through the top sheet 11. The planar shape of the inner body 10 is not particularly limited, but is generally set to be a substantially rectangular shape as shown in the figure.

[0062] As the top sheet 11 covering the front side (skin contact side) of the absorbent body 13, it is preferred to use a non-woven fabric with or without holes, a porous plastic sheet, etc. As for the fabric fibers that constitute the non-woven fabric, in addition to synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, it can also be regenerated fibers such as rayon or cuprammonium fibers, natural fibers such as cotton, and non-woven fabrics obtained by appropriate processing methods such as hydroentanglement, spunbonding, hot rolling, meltblowing, and needle punching can be used. Among these processing methods, hydroentanglement is excellent in terms of softness and drape, and hot rolling is excellent in terms of bulkiness and softness. When a plurality of through holes are formed in the top sheet 11, urine and the like are quickly absorbed. In the illustrated embodiment, the top sheet 11 rolls up the side edge of the absorbent body 13 and extends to the back side of the absorbent body 13.

[0063] The liquid-impermeable sheet 12, which covers the back side (non-skin-contacting side) of the absorbent core 13, is made of a liquid-impermeable plastic sheet such as polyethylene or polypropylene. However, in recent years, moisture-permeable sheets have become preferred to prevent dampness. Suitable examples of this water-insulating / moisture-permeable sheet include microporous sheets formed by melt-kneading inorganic particles such as calcium carbonate in an olefin resin such as polyethylene or polypropylene to form a sheet, followed by uniaxial or biaxial stretching. In the illustrated embodiment, the liquid-impermeable sheet 12 is folded back toward the back side along with the top sheet 11 on both sides of the absorbent core 13 in the width direction WD. However, this is not limited to this structure, and other known structures may be employed.

[0064] As the absorbent body 13, a known absorbent body can be used. For example, an absorbent body based on a pulp fiber compact, an aggregate of filaments such as cellulose acetate, or a nonwoven fabric, with a superabsorbent polymer mixed and fixed thereto as needed, can be used. The overall shape of the absorbent body 13 can be a roughly hourglass shape with a narrowed portion in the crotch area that is narrower than the width at the front and rear ends, or a suitable shape such as a rectangle. The absorbent body 13 can be positioned within a region including the rear end of the inner body 10 or within only a portion of the inner body 10. However, in general, it is preferably positioned over the entire region of the inner body 10, excluding the front and rear ends.

[0065] In order to maintain the shape and polymer, etc., the absorbent body 13 can be packaged with a packaging sheet 14 having liquid permeability and liquid retention, such as crepe paper, as needed. As the packaging sheet 14, thin paper (especially crepe paper), non-woven fabric, polyethylene laminated non-woven fabric, a sheet with small holes, etc. can be used. However, a sheet from which superabsorbent polymer particles do not fall out is preferred. When non-woven fabric is used instead of crepe paper, hydrophilic SMS non-woven fabric (SMS, SSMMS, etc.) is particularly preferred, and its material can be polypropylene, polyethylene / polypropylene composite material, etc. The unit area weight of the packaging sheet 14 is preferably 5 to 40 g / m 2 , particularly preferably 10 to 30 g / m 2 .

[0066] The packaging form of the packaging sheet 14 can be determined appropriately, but from the perspective of ease of manufacturing and preventing superabsorbent polymer particles from leaking from the front and rear edges, it is preferably in the following form: the packaging sheet 14 is wound into a cylindrical shape in a manner that surrounds the front and back surfaces and both side surfaces of the absorbent body 13, and its front and rear edges extend from the front and rear of the absorbent body 13, and the overlapping parts of the wound parts and the overlapping parts of the front and rear extending parts are joined together using joining means such as hot melt adhesives and material welding.

[0067] On both sides of the inner body 10 in the width direction WD, there are standing gathers 90. The standing gathers 90 have standing portions 94 standing up from the sides of the inner body 10. The standing portions 94 are in contact with the wearer's groin, around the legs, and around the buttocks to prevent side leakage. Figure 5 and Figure 6 As shown, the standing gathers 90 shown in the illustration have a gather-fixing portion 91 fixed to the side of the back of the inner body 10; a main portion 92 extending from the gather-fixing portion 91 through the side of the inner body 10 to the side of the front of the inner body 10; a collapsed portion 93, formed by the front and rear ends of the main portion 92 being collapsed and fixed to the side of the front of the inner body 10; and a standing portion 94, formed by leaving the collapsed portion 93 free from the gaps between them. These portions have a two-layer structure formed by folding back a gather sheet 95. Between these layers, elongated gather elastic members 96 are positioned, such as at the ends of the standing portions 94. This structure allows the standing portions 94 of the standing gathers 90 to stand upright in contact with the wearer's skin. A water-resistant nonwoven fabric is preferably used for the gather sheet 95.

[0068] The gathering elastic members 96 can be made of commonly used materials such as styrene rubber, olefin rubber, polyurethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene-butadiene rubber, silicone, and polyester. To prevent visibility from the outside, the gathering elastic members 96 can be arranged with a thickness of 925 dtex or less, a tension of 150-350%, and a spacing of 7.0 mm or less. In addition to the linear form shown in the illustration, the gathering elastic members 96 can also be in the form of bands of a certain width.

[0069] The fabric fibers constituting the aforementioned pleated sheet 95 are similar to those of the top sheet 11. In addition to synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters, and polyamides, regenerated fibers such as rayon and cuprammonium, and natural fibers such as cotton can also be used. Non-woven fabrics produced by appropriate processing methods such as spunbonding, thermal bonding, meltblowing, and needle punching can be used. In particular, non-woven fabrics with excellent breathability due to a reduced weight per unit area can be used to prevent dampness. Furthermore, for the pleated sheet 95, a waterproof non-woven fabric coated with a silicone-based, paraffin-based, metal-based, or alkyl chromium chloride-based waterproofing agent is preferably used to prevent the penetration of urine, prevent rashes, and improve skin feel (dryness).

[0070] (Example of the structure of the outer casing)

[0071] like Figures 4 to 6 As shown, the outer body 20 is formed into a two-layer structure consisting of a pressing sheet 20A and a back sheet 20B. The pressing sheet 20A and the back sheet 20B are each made of a nonwoven fabric or the like. Elastic members 24 to 27 are disposed between the pressing sheet 20A and the back sheet 20B, and between the nonwoven fabric of the folded portion 20C formed by folding the back sheet 20B inward at the edge of the waist opening. In its natural length, the outer body 20 contracts due to the contractile force of the elastic members 24 to 27, thereby imparting stretchability to the outer body 20. The outer body 20 has a generally hourglass shape in plan view, due to the concave leg girth lines 29 formed on both sides of the center in the front-to-back direction LD to form leg openings.

[0072] In the outer casing 20 of the illustrated embodiment, as the elastic member, Figure 1 and Figure 2In the expanded configuration shown, the garment comprises a waist elastic member 24 positioned near the waist opening 23, and a plurality of lower waist elastic members 25 spaced longitudinally along the widthwise direction WD in the front and back sections F and B. In addition to the lower waist elastic members 25, each of the front and back sections F and B comprises a plurality of curved elastic members 26 and 27. These curved elastic members 26 and 27 extend in a pattern extending from one side seal 21 along one leg opening toward the crotch, traversing the crotch, and then along the other leg opening to the other side seal 21. These curved elastic members 26 and 27 are arranged at intervals, not intersecting one another. Each of these elastic members 24-27 is secured in a state of being stretched at a predetermined rate along its extension direction. Furthermore, the outer garment 20 does not include so-called leg elastic members that extend continuously from the side seals of the front section F to the side seals of the back section B along the leg line 29.

[0073] The waist elastic members 24 are elongated elastic members, such as multiple rubber threads, spaced longitudinally within the side seals 21 formed by the joined front and back sections F and B, near the waist opening. The waist elastic members 24 are used to secure the diaper to the wearer by applying a stretching force to the waist. In the illustrated example, rubber threads are used for the waist elastic members 24, but a belt-shaped stretchable member, for example, may also be used. In the illustrated example, the waist elastic members 24 are sandwiched between the nonwoven fabric of the folded portion 20C of the back sheet 20B at the waist, but they may also be sandwiched between the pressure sheet 20A and the back sheet 20B.

[0074] The lower waist elastic members 25 are elongated elastic members, such as rubber threads, arranged longitudinally and spaced apart, extending approximately from the top to the bottom of the side seals 21. They are used to apply a stretching force in the width direction WD to the waist areas of the front and back sections F and B, respectively, to ensure a close fit of the diaper to the body. Furthermore, the boundary between the waist elastic members 24 and the lower waist elastic members 25 need not be clearly defined. For example, even if the number of elastic members arranged longitudinally and spaced apart along the width direction WD in the front and back sections F and B is uncertain, it is sufficient that a few elastic members on the upper side function as waist elastic members, and the remaining elastic members function as lower waist elastic members.

[0075] In the back section B, the back-curved elastic member 26, provided separately from the lower waist elastic member 25, is a slender elastic member such as a rubber thread, arranged along a predetermined curve. While a single back-curved elastic member 26 is preferred, multiple members are preferred. In the illustrated example, four such slender elastic members are arranged at intervals, rather than crossing each other. These back-curved elastic members 26 are not essentially a bundle of two or three closely spaced elastic members. Instead, three or more (preferably four or more) back-curved elastic members 26 are arranged at intervals of approximately 3 to 20 mm (preferably 6 to 16 mm) to form a predetermined stretch zone.

[0076] In the front portion F of the outer body 20, the ventral curving elastic member 27, provided separately from the lower waist elastic member 25, is a slender elastic member such as a rubber thread, arranged along a predetermined curve. While a single ventral curving elastic member 27 is preferred, a plurality of ventral curving elastic members are preferred. In the illustrated example, four ventral curving elastic members are arranged at intervals, rather than intersecting each other. These ventral curving elastic members 27 are not essentially a bundle of two or three closely spaced elastic members. Instead, three or more (preferably four or more) ventral curving elastic members 27 are arranged at intervals of approximately 3 to 20 mm (preferably 6 to 16 mm) to form a predetermined stretch zone.

[0077] In addition, if Figure 2 As shown, the waist elastic members 25 and the curved elastic members 26 and 27 disposed in the front and back sections F and B are continuously fixed to the outer body 20 during manufacture. Then, the middle portion of the portion overlapping the absorbent body 13 in the width direction WD (the portion surrounded by the two-dot chain line in the figure) can be finely cut in a predetermined cutting pattern to form a non-contracted portion where contraction does not occur. The portion extending laterally from this non-contracted portion serves as the contracted portion where contraction does occur (i.e., the portion where the waist elastic members 25 and the curved elastic members 26 and 27 remain continuously). This prevents unnecessary contraction of the inner body (particularly the absorbent body 13) in the width direction WD. Of course, the waist elastic members 25 and the curved elastic members 26 and 27 can also be disposed continuously across the inner body 10.

[0078] As can be seen from this example, the contracted portion of the area where the elastic members 24 to 27 are arranged becomes the stretch zone, and the non-contracted portion becomes the non-stretch zone. The stretch zone may be provided only in the back body portion B, closer to the waist than the rear end of the absorbent body 13, or may be provided in various areas as shown in the example or other known examples.

[0079] The outer body 20 can be manufactured using the techniques described in, for example, Japanese Patent Application Laid-Open Nos. 4-28363 and 11-332913. Furthermore, to discontinuously cut the curved elastic members 26 and 27 on the inner body 10, it is preferable to use the cutting methods described in Japanese Patent Application Laid-Open Nos. 2002-35029, 2002-178428, and 2002-273808.

[0080] Unlike the example shown in the figure, the curved elastic members 26 and 27 may be provided on only one of the front section F and the back section B. Furthermore, when the curved elastic members 26 and 27 are provided on both the front section F and the back section B, a configuration (not shown) may be adopted in which part or all of the group of curved elastic members 27 arranged on the front section F side intersects with part or all of the group of curved elastic members 26 arranged on the back section B side. However, it is preferred that, as in the example shown in the figure, the group of curved elastic members 27 arranged on the front section F side and the group of curved elastic members 26 arranged on the back section B side do not intersect with each other, but are separated in the longitudinal direction at an intermediate position in the front-to-back direction LD, particularly at a position slightly offset from the front section F.

[0081] Furthermore, the curved elastic members 26 and 27 do not need to be curved as a whole, and may partially have a linear portion.

[0082] The elongation of the elastic parts 24 to 27 when fixed can be determined appropriately, but in the case of normal adult use, the waist elastic part 24 can be about 160 to 320%, the elastic part 25 below the waist can be about 160 to 320%, and the curved elastic parts 26 and 27 can be about 230 to 320%.

[0083] (cover piece)

[0084] like Figure 1 and Figure 4As shown, cover sheets 50 and 60 may be provided to cover the front and rear ends of the inner body 10 attached to the inner surface of the outer body 20 and prevent leakage from the front and rear edges of the inner body 10. To further illustrate the illustrated embodiment, the front cover sheet 50 extends from near the waist opening of the front body F to a position overlapping the front end of the inner body 10, and the rear cover sheet 60 extends from near the waist opening of the rear body B to a position overlapping the rear end of the inner body 10, covering the entire width of the front body F. In addition to being substantially entirely bonded to opposing surfaces using a hot melt adhesive or the like, the cover sheets 50 and 60 may also have non-bonded portions at the crotch-side edges of the cover sheets 50 and 60 extending throughout the entire width direction WD (or only in the center). In this latter case, not only does the adhesive not overflow, but this portion can also be slightly raised from the top sheet, functioning as a leak-proof barrier.

[0085] If the cover sheets 50 and 60 are attached separately as shown in the figure, while there is an advantage of greater freedom in the choice of fabrics, there are also disadvantages such as an increase in the number of materials and manufacturing steps. Therefore, it is also possible to extend the folded portion 20C formed by folding the outer body 20 toward the inner surface of the diaper to the portion overlapping the inner body 10, thereby forming a portion equivalent to the cover sheets 50 and 60 described above.

[0086] (Back side barrier)

[0087] like Figure 1 、 Figure 3 and Figure 4 As shown in the figures, etc., a back barrier 70 is provided in the back body portion B at a position closer to the waist opening than the crotch portion. The back barrier 70 has a first blocking position B1 that blocks the movement of excrement to the rear, and a second blocking position B2 that blocks the movement of excrement to both sides in the width direction WD. The first blocking position B1 is not particularly limited, but is preferably a position overlapping with the rear end of the inner body 10, and more preferably between the rear end of the inner body 10 and the rear end of the absorbent body 13. However, it may also be a position overlapping with the rear end of the absorbent body 13. The second blocking position B2 is not particularly limited, but preferably passes near the side edge 10e of the inner body 10 (for example, between the end 90e of the standing gather 90 and a position that is a mirror image of the end 90e relative to the side edge 10e of the inner body 10) and extends in the front-to-back direction LD.

[0088] The back barrier 70 mainly includes: a barrier sheet 71, which extends from the front side of the first blocking position B1 to the back side with a width wider than the width direction dimension of the first blocking position B1 (the interval in the width direction of the second blocking position B2); and a barrier elastic component described later. Regarding the barrier sheet 71, in addition to configuring a dedicated sheet as shown in the example, it can also be formed by extending the cover sheet 60 of the back body part B toward the crotch side. The material of the barrier sheet 71 is not particularly limited, but it is preferably the same material as the pleated sheet 95, but it is also possible to use the same material as the pressing sheet 20A or the back sheet 20B, or the same material as the cover sheets 50, 60.

[0089] The barrier sheet 71 includes a base portion 72 adjacent to the rear side of the first blocking position B1, and a main portion 73 adjacent to the front side of the first blocking position B1. The base portion 72 is fixed to the front side of the back body portion B (in the illustrated example, the front side of the cover sheet 60 in the outer body 20). On the other hand, the main portion 73 includes two side portions 73s adjacent to the outside (both sides) of the second blocking position B2, and a middle portion 73m located between the second blocking positions B2. The two side portions 73s of the main portion 73 include a first portion 81 extending forward of the first blocking position B1; a second portion 82 folded back toward the front at a bend along the front edge of the first portion 81 and then extending backward; and a third portion 83 folded back toward the front at a bend along the rear edge of the second portion 82 and then extending forward. The back surface of the first portion 81 is fixed to the front surface of the back body portion B, and the back surface of the second portion 82 is fixed to the front surface of the first portion 81. The third portion 83 is not fixed to the second portion 82. The middle portion 73m of the main portion 73 is not fixed to the front surface of the back body portion B (in the illustrated example, the front surface of the cover sheet 60 in the outer body 20 and the front surface of the inner body 10). The base 72 and the first portion 81 and the second portion 82 may be fixed by using hot melt adhesives HM1 and HM2 as shown in the example. However, although not shown, the barrier sheet 71 may also be fixed by welding the surface material.

[0090] In addition, the main portion 73 includes an elongated barrier elastic member 74 extending from one third portion 83 to the other third portion 83 in the width direction WD. In the state of the natural length, as shown in FIG. Figure 9As shown, the main portion 73 and the barrier elastic component 74 elastically shrink in the width direction WD. However, the barrier elastic component 74 is not set to extend from the rear end of the third part 83 on one side to the rear end of the third part 83 on the other side. In the example shown in the figure, the barrier sheet 71 has a double-layer structure integrated by a hot melt adhesive (the dotted part in the cross-sectional view), etc., and the barrier elastic component 74 and the like are sandwiched between its layers and fixed by a hot melt adhesive, etc., but the barrier elastic component 74 and the like can also be fixed to either side of the front and back of the barrier sheet 71. In addition, when the barrier sheet 71 is designed to have a double-layer structure, in addition to folding a sheet in half at the rear end (or the front end) as shown in the example shown in the figure, two different sheets can also be stacked. In addition, in order to improve waterproofness and composability, a waterproof sheet similar to the liquid-impermeable sheet 12 can also be sandwiched between the layers of the barrier sheet 71.

[0091] In this way, if the back barrier 70 has a characteristic folded structure and the arrangement of the barrier elastic member 74, it becomes Figure 9 That is, the main portion 73 of the barrier sheet 71 is as shown in FIG. Figure 9 As shown in (b), there is a fold from the first part 81 to the second part 82 and a fold from the second part 82 to the third part 83, but in the middle part 73m between them, the fold gradually expands to the front side as it moves toward the center side of the width direction WD. Figure 9 As shown in (c), it is fully extended to the front side (or extended to the middle of the front side) (the first state). The reason for this is not clear, but it is believed that the reason is that the middle part 73m of the main part 73 having the barrier elastic part 74 is a free part that is not fixed, and the barrier elastic part 74 is only provided at a position away from the rear edge of the third part 83. Therefore, when the middle part 73m of the main part 73 and the barrier elastic part 74 are elastically contracted, as shown in FIG. Figure 9 As shown in (a), the third portion 83 freely tilts toward the center in the width direction WD, and the component of the force applied to the middle portion 73m of the main portion 73 by the elastic contraction force of the barrier elastic member 74, which causes the middle portion 73m of the main portion to fold back in the same direction as the side portions, is reduced. Furthermore, it is believed that the expansion of the middle portion 73m of the main portion 73 is also influenced by the formation of contraction wrinkles extending in the front-to-back direction LD throughout the entire middle portion 73m of the main portion 73, resulting in increased rigidity (making it difficult to bend in the front-to-back direction LD).

[0092] On the other hand, when the barrier sheet 71 is worn, if the main portion 73 and the barrier elastic member 74 are stretched in the width direction WD, the two side portions 73s of the main portion 73 are as follows. Figure 4As shown in (b), the folding from the first part 81 to the second part 82 is maintained, and the folding from the second part 82 to the third part 83 is also maintained to a certain extent. However, in the middle part 73m of the main part 73, as shown in FIG. Figure 4 As shown by the arrows in (a) and (c), the pivoted portion, located distal to an imaginary line along the width direction WD passing through the boundary between the first and second portions 81 and 82 (the folded position), pivots rearward about this imaginary line (second state). The reason for this is uncertain, but it is believed that the barrier elastic member 74 is stretched in a manner approximating a straight line along the width direction WD. This elastic contraction of the barrier elastic member 74 increases the component of the force acting on the middle portion 73m of the main portion 73 in the direction of folding back similarly to the side portions. Meanwhile, the third portion is not fixed throughout the entire width direction, making the folding force less effective. The degree of this pivoting can be adjusted appropriately by, for example, the placement of the barrier elastic member 74. It can be set to slightly rise from its natural length or tilted back toward the rear (toward the waist opening) in the opposite direction of its natural length.

[0093] In addition, it can be seen from the changes between the first and second states that, in the wearing state in which the garment is shrunk to a certain extent, since the middle portion 73m of the main portion 73 is not fixed to the front of the back body portion B, and the base portion 72 located on the rear side and the side portions 73s of the main portion 73 located on both sides thereof are directly or indirectly fixed to the front of the back body portion B, a pocket-shaped back barrier 70 is formed between the middle portion 73m of the main portion 73 and the front of the back body portion B, which is open to the crotch side. Therefore, the movement of excrement reaching the pocket toward the rear and sides can be blocked. Figure 13 and Figure 14 As shown, if the upright portion 94 of the upright pleats 90 is located within the pocket, the pocket of the back barrier 70 is easily opened due to the upright force of the upright pleats 90, so this is preferred. However, the collapsed portion 93 of the upright pleats 90 may be located within the pocket of the back barrier 70, or the rear end of the inner body 10 may be located closer to the front of the pocket of the back barrier 70.

[0094] As described above, in the present shorts-type disposable diaper, since the back barrier 70 changes between the first state, the second state, and the wearing state, the back barrier 70 automatically stands up during use, and it is less likely that the back barrier 70 will be used directly in a state where it is crushed. Furthermore, let us now consider the case where a pad-type absorbent article is placed on the inner surface of the present shorts-type disposable diaper. The shorts-type disposable diaper before wearing is in the state Figure 10 In order to wear the shorts type disposable diaper, as shown in (a). Figure 11As shown in FIG. 1 , when the legs are passed through the leg openings and are stretched to a certain extent, as shown by the arrows in the figure, the main portion 73 of the barrier sheet 71 and the barrier elastic member 74 are stretched in the width direction WD due to the extension of the waist region of the outer body 20 in the width direction. As a result, as shown in FIG. Figure 10 As shown in (b), in the middle portion 73m of the main portion 73, the rotating portion is rotated and rolled up. Figure 10 As shown in (c), the pad type absorbent article 30 can be laid out so that the rear end of the pad type absorbent article 30 is aligned along the rolled position of the back barrier 70. Then, when the shorts type disposable wearing article is lifted up and put on, as shown in FIG. Figure 10 As shown in (d), the back barrier 70 returns to a state close to its natural length and covers the rear end of the pad-type absorbent article 30. Figure 16 As shown in (a), if the back barrier 170 does not automatically stand up when in use, the back barrier 170 will not function properly for the pad-type absorbent article 30 unless the back barrier 170 is manually stood up and the pad-type absorbent article 30 is inserted thereunder. Figure 16 As shown in (b) of FIG. 1 , the pad-type absorbent article 30 may be mistakenly placed on the back barrier 170 .

[0095] By appropriately determining the dimensions of each portion of the barrier sheet 71 and the elongation of the third portion 83, it is possible to adjust the degree of elongation to which the intermediate portion 73m of the main portion 73 rotates.

[0096] The size of the middle portion 73m of the main portion 73 in the width direction WD: 180 to 200 mm

[0097] Dimension L2 of the second portion 82 in the front-back direction LD: 5 to 25 mm

[0098] Dimension L3 of the third portion 83 in the front-back direction LD: 10 to 35 mm

[0099] Elongation of the third portion 83 at maximum elongation in the width direction WD: 180-280%

[0100] The distance 74D between the rear edge of the third portion 83 and the barrier elastic member 74 in the front-to-back direction LD is 3 to 20 mm.

[0101] In this case, when the third portion is stretched to 0.4 times or more of the maximum stretch rate, the angle of the aforementioned rotating portion relative to the front of the back portion B is about 90 degrees, and when it is stretched to 0.6 times or more of the maximum stretch rate, the angle of the rotating portion relative to the front of the back portion B is about 90 degrees. Figure 4The maximum extension state shown is the same, and the rotating portion tilts toward the rear side (waist opening side). In addition, such action is not limited to this condition.

[0102] In addition to the barrier elastic member 74, a shaping elastic member 75 is provided that passes through at least one of the first portion 81, the second portion 82, and the base portion 72 and extends across the entire width direction WD of the back barrier 70. This is preferable because, when the back barrier 70 and the shaping elastic member 75 elastically contract in the width direction WD in its natural length, the shape of the back barrier 70 remains uniform and the intermediate portion 73m easily expands in its natural length. The illustrated example includes one elongated shaping elastic member 75 extending in the width direction WD from one second portion 82 of the main portion 73 to the other second portion 82, and three elongated shaping elastic members 75 extending in the width direction WD across both side portions 73s of the base portion 72. No shaping elastic member 75 is provided that passes through the first portion 81. When a plurality of the shaping elastic members 75 are provided in any of the base portion 72 , the first portion 81 , and the second portion 82 , the intervals between them in the front-back direction LD may be approximately 3 to 7 mm.

[0103] The shorts-type disposable diaper of this example has a waist stretch region (stretch region based on the waist elastic component 24 and the lower waist elastic component 25) that elastically contracts in the width direction WD within the range of the front-to-back direction LD of the outer body 20 having the side seal portion 21, and has a non-stretch region in the middle of the width direction WD of the region overlapping with the absorbent body 13. In such a case, if the base 72 of the barrier sheet 71 is fixed to the portion of the waist opening side adjacent to the rear end of the absorbent body 13 in the waist stretch region and is configured to be stretchable together with the waist stretch region, the shape of the back barrier 70 becomes neat, and therefore it is preferred. In addition, in the state of natural length, the waist stretch region elastically contracts in the width direction WD, while the non-stretch region does not contract, and therefore, as shown in FIG. Figure 9 As shown in (a), the portion including the back barrier 70 shrinks less in the width direction WD as it moves toward the front side, so that the back barrier 70 becomes fan-shaped. As a result, the middle portion 73m is more easily expanded in the natural length state.

[0104] The color or pattern of the front and back of the barrier sheet 71 may be the same, but if at least the middle portion 73m (preferably the entire portion) of the main portion 73 of the barrier sheet 71 is Figure 15 As shown, the colors of the front and back sides are different, so that the user can easily see the automatic deformation of the back barrier 70 ( Figure 9 The first state shown in (a) is Figure 15, and the second state shown in the figure), so it is preferred. In addition, when the pad-type absorbent article 30 is laid on the inner surface of the shorts-type disposable diaper for use, there is also an advantage that the proper wearing position of the pad-type absorbent article 30 can be easily visually confirmed. The example in the figure envisions a situation where, although it is hidden on the back side in the first state, the first surface exposed to the front side is colored as shown by the oblique lines in the figure in the second state, and the opposite second surface is not colored. However, it may also be a structure where the second surface is colored oppositely without coloring the first surface; or, different colors are applied to the first and second surfaces. Regarding coloring, appropriate methods such as printing on the barrier sheet 71 and gluing on the raw material of the barrier sheet 71 may be adopted. In addition, instead of coloring, a pattern may be printed, or a pattern may be added by embossing, or a display such as text or a mark may be added.

[0105] <Explanation of terms used in this manual>

[0106] When the following terms are used in the specification, they have the following meanings unless otherwise specified in the specification.

[0107] The “front-rear direction” refers to the direction (longitudinal direction) indicated by symbol LD in the drawings, and the “width direction” refers to the direction (left-right direction) indicated by WD in the drawings. The front-rear direction is perpendicular to the width direction.

[0108] The "expanded state" refers to a state in which the device is flatly expanded without shrinkage or relaxation.

[0109] "Elongation" refers to the value when the natural length is 100%. For example, an elongation of 200% is synonymous with a stretch ratio of 2.

[0110] · "Weight per unit area" is measured as follows. After pre-drying the sample or test piece, place it in a test room or device under standard conditions (the test site is a temperature of 23±1°C and a relative humidity of 50±2%) to make it a constant state. Pre-drying means that the sample or test piece is kept at a temperature of 100°C. In addition, for fibers with a legal moisture content of 0.0%, pre-drying is not required. From the test piece that has become a constant state, use a template (100mm×100mm) for sample collection to cut a sample of 100mm×100mm per square meter. Measure the weight of the sample, multiply it by 100, and calculate the weight per square meter as the weight per unit area.

[0111] "Thickness" is measured using an automatic thickness gauge (KES-G5 portable compression tester) at a load of 0.098 N / cm 2 、The pressure area is 2cm 2 Automatic measurement under the conditions of

[0112] In the absence of any description of the environmental conditions during testing or measurement, the testing or measurement was conducted in a test room or device under standard conditions (test location temperature 23±1°C, relative humidity 50±2%).

[0113] · Unless otherwise specified, the dimensions of each part refer to the dimensions in the unfolded state, not the dimensions in the natural length state.

[0114] Industrial applicability

[0115] The present invention can be used not only for the underpants-type disposable diapers as in the above-mentioned examples, but also for all underpants-type disposable wearing articles such as underpants-type disposable diaper covers and underpants-type sanitary products.

[0116] Description of labels

[0117] 10: Inner body; 11: Top sheet; 12: Liquid-impermeable sheet; 13: Absorbent body; 14: Wrapping sheet; 20: Outer body; 20C: Folding portion; 21: Side seal portion; 24: Waist elastic component; 25: Elastic component below waist; 26, 27: Curved elastic component; 26: Dorsal curved elastic component; 27: Ventral curved elastic component; 29: Leg girth; 90: Standing pleats; 91: Pleated fixing portion; 92: Main body; 93: Falling portion; 94: Standing portion; 9 5: Pleated sheet; 96: Pleated elastic component; F: Front body; B: Back body; LD: Front-to-back direction; WD: Width direction; 70: Back barrier sheet; 71: Barrier sheet; 72: Base; 73: Main part; 73s: Both sides; 73m: Middle part; 74: Barrier elastic component; 75: Shaping elastic component; 81: Part 1; 82: Part 2; 83: Part 3; B1: First blocking position; B2: Second blocking position; 30: Pad-type absorbent article.

Claims

1. A shorts-type disposable wearing article, characterized in that: The shorts-type disposable wearing article comprises: An integral outer body extending from the front to the back, or outer bodies provided separately on the front and back parts; An inner body extending from the front body portion to the back body portion, and attached to the middle of the outer body in the width direction; Side seals formed by joining the two side portions of the outer body in the front body portion and the two side portions of the outer body in the back body portion; Waist opening and a pair of left and right leg openings; as well as A back barrier is provided at a position of the back body portion closer to the waist opening than the crotch portion. The back blocking member has a first blocking position for blocking the movement of excrement to the rear and a second blocking position for blocking the movement of excrement to both sides in the width direction. The back blocking member includes a blocking piece extending from the front side to the rear side of the first blocking position with a width wider than that of the first blocking position. The barrier sheet has: a base portion adjacent to the rear side of the first blocking position; and a main portion adjacent to the front side of the first blocking position, The base is fixed to the front side of the back body portion, The main portion includes: two side portions adjacent to the outer sides of the second blocking position; and a middle portion located between the second blocking positions. The two side portions of the main portion include: a first portion extending toward the front side of the first blocking position; and a second portion folded toward the front side at a bent position along the front edge of the first portion and then extending toward the rear side. and a third portion that is folded back toward the front side at a bent position along the rear edge of the second portion and then extends toward the front side. The back of the first part is fixed to the front of the back part, and the back of the second part is fixed to the front of the first part, and the third part is not fixed to the second part. The middle portion of the main portion is not fixed to the front of the back portion, The pants-type disposable wearing article is provided with an elongated barrier elastic member, the barrier elastic member extending in the width direction from the third portion on one side of the main portion to the third portion on the other side. The barrier elastic component is not provided at the rear end portion of the third portion. In a state of a natural length, the main portion elastically contracts in the width direction together with the barrier elastic member.

2. The shorts-type disposable wearing article according to claim 1, wherein: The width of the middle portion of the main portion is 180 mm to 200 mm. The size of the second part in the front-to-back direction is 5mm to 25mm, The dimension of the third part in the front-to-back direction is 10 mm to 35 mm. The elongation of the third portion at maximum elongation in the width direction is 180% to 280%. The distance between the rear edge of the third portion and the barrier elastic component in the front-to-back direction is 3 mm to 20 mm.

3. The shorts-type disposable wearing article according to claim 1 or 2, wherein: The shorts-type disposable wearing article is provided with at least one of the following elongated shaping elastic members: a slender shaping elastic member extending in the width direction from the second portion on one side of the main portion to the second portion on the other side; a long and narrow shaping elastic member extending in the width direction from the first portion on one side of the main portion to the first portion on the other side; as well as elongated shaping elastic members extending in the width direction over both sides of the base, In a state of a natural length, the main portion elastically contracts in the width direction together with the shaping elastic member.

4. The shorts-type disposable wearing article according to claim 1 or 2, wherein: The inner body has an absorbent body provided in a range including the crotch portion. The outer body has a waist stretch region that is elastically contractible in the width direction within the front-back direction of the side seal portion, and a non-stretch region in the middle of the width direction of the region of the outer body that overlaps with the absorbent body. The waist stretch zone has a portion adjacent to the waist opening side of the rear end of the absorbent body. The base of the barrier sheet is fixed to a portion of the waist stretch region adjacent to the waist opening of the rear end of the absorbent body and is stretchable together with the waist stretch region.

5. The shorts-type disposable wearing article according to claim 1 or 2, wherein: The front and back sides of at least the middle portion of the main portion of the barrier sheet have different colors, patterns or displays.

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