Pants-type disposable absorbent article

Abstract

To provide an absorbent article suppressing increase in the thickness of a product due to a post-treatment tape.SOLUTION: An underpants-type disposable absorbent article is characterized in that a post-treatment tape 70 attached in a folded state of being folded in the longitudinal direction a plurality of times is attached to a rear outer wrapper 12B, a laminated part overlapped with an absorber 56 is provided at least a part of the folded post-treatment tape 70, a recessed area 71 in which no absorber 56 is present is provided at a part overlapped with the laminated part or at a further wide area, and the post-treatment tape 70 is stored in the recessed area 71.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a pant-type disposable absorbent article equipped with a post-treatment tape. [Background technology]

[0002] Pants-type disposable absorbent articles generally have a strip-shaped post-treatment tape on the back of the article to hold the article in a rolled-up state after use (see Patent Documents 2 and 3). This post-treatment tape generally has a root portion fixed to the outer surface of the article, a main portion extending from the root portion, and an adhesive portion provided at least at the tip of the main portion, and when holding the article in a rolled-up state after use, the main portion is generally wrapped around the outer periphery of the rolled article and the adhesive portion is adhered to the outer periphery of the article. In addition, the post-treatment tape needs to be of a certain length to hold the rolled-up article, so it is often attached in a folded state with multiple folds.

[0003] However, when a post-treatment tape that is folded multiple times is fixed to the rear exterior body of a pants-type disposable absorbent article, the area where the post-treatment tape is placed becomes locally thick (protrudes), which causes the following problems. That is, if the thickness of the product increases due to the post-treatment tape, when multiple products are stacked in the thickness direction and sealed in a packaging bag, the number of sheets that can be sealed per bag may decrease. In addition, there is a possibility that the post-treatment tape may get caught on clothing or other objects while the article is being worn, making it impossible to use the post-treatment tape. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-50912 A [Patent Document 2] Patent No. 4828625 [Patent Document 3] JP 2019-170730 A Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, a main object of the present invention is to suppress an increase in product thickness caused by the post-treatment tape. [Means for solving the problem]

[0006] The pants-type disposable absorbent article that solves the above problems is as follows. <First aspect> The garment has a tubular waist region that is continuous in a waist direction, an intermediate region that extends from a lower end of a front portion of the waist region through a crotch area to a lower end of a rear portion of the waist region, a waist opening, and a pair of left and right leg openings, an absorbent body extending from a front portion of the waist region through the crotch region to a rear portion of the waist region; A pants-type disposable absorbent article having a belt-shaped post-treatment tape attached to a rear portion of the waist region in a folded state by being folded back multiple times in the front-rear direction, the post-treatment tape has a laminated portion at least a part of which overlaps with the absorbent body, the laminated portion is located between positions where the laminated portion overlaps with both side edges of the absorbent body and is located forward of a position where the laminated portion overlaps with a rear end of the absorbent body; A recessed area is provided in a portion overlapping the entire laminated portion or in a wider area, the recessed area being free of the absorbent body or having a recess formed in the bottom surface of the absorbent body; a thickness of the recessed area excluding the post-treatment tape is smaller than a thickness of an area having the absorbent body around the recessed area; A pants-type disposable absorbent article.

[0007] (Action and effect) In this way, when there is a laminated portion (thickest portion) where at least a part of the post-treatment tape overlaps with the absorbent, a recessed area where the absorbent is thin or absent is provided in the portion overlapping the entire laminated portion or in a wider area, and the thickness of the recessed area excluding the post-treatment tape is made thinner than the thickness of the area around the recessed area that has the absorbent, thereby suppressing an increase in product thickness caused by the post-treatment tape. As a result, when a large number of products are stacked in the thickness direction and enclosed in a packaging bag, the risk of a reduction in the number of products enclosed per bag can be reduced. In addition, the post-treatment tape is less likely to get caught on clothing or objects while the article is being worn.

[0008] <Second aspect> The recessed region is a region in which a recess is formed on the bottom surface of the absorbent body by embossing or the like, or a region in which the absorbent body is composed of an upper layer and a lower layer and only the upper layer is present. A pants-type disposable absorbent article according to a first embodiment.

[0009] (Action and effect) The recessed area can be an area without an absorbent body by providing a slit in the absorbent body, but in that case, since there is a risk of reducing the absorption performance in a relatively important area, it is preferable to make it an area with a recess on the bottom surface of the absorbent body. The method of forming a recess on the bottom surface of the absorbent body is not limited, but it can be formed, for example, by embossing the absorbent body alone or including the member located on the back side of the absorbent body. In addition, when the absorbent body is formed of two layers, an upper layer and a lower layer, it is also possible to make the part where only the upper layer and no lower layer are present a recess.

[0010] <Third aspect> The pants-type disposable absorbent article is a disposable swimsuit having an outer surface made of a nonwoven fabric, In the post-treatment tape, in the folded state, adjacent layers are bonded together via the hook material of the mechanical fastener, and in a state where the post-treatment tape is unfolded from the folded state, the hook material of the mechanical fastener remains on at least one of the front and rear surfaces, The hook material of the mechanical fastener is provided at least on the laminated portion, With the pant-type disposable wearing article in a rolled-up state, the post-treatment tape is unfolded from the folded state and wound around the pant-type disposable wearing article in the rolled-up state, and the hook member of the mechanical fastener remaining on at least one of the front and rear surfaces of the post-treatment tape is attached to an outer surface of the pant-type disposable wearing article in the rolled-up state. A pants-type disposable absorbent article according to the first or second embodiment.

[0011] (Action and effect) As one type of pants-type disposable wearing article, pants-type disposable swimsuits (also called swimming pants) intended for use in pools for infants and small children are commercially available (see, for example, Patent Document 1). However, no conventional pants-type disposable swimsuits have been provided with a post-treatment tape. The reason is that an adhesive is generally used as a joining means for fixing the post-treatment tape to the outer surface of the product, and if the outer surface of the product or the adhesive is wet, the post-treatment tape cannot be fixed. Therefore, the present inventor came up with the idea of ​​using a hook material (male material) of a mechanical fastener (hook-and-loop fastener) as a joining means that can be fixed even when wet. However, since the hook material is thicker than the adhesive, it is desirable to combine it with the aforementioned recessed area.

[0012] <Fourth aspect> an exterior body that forms at least the waist region; an inner body attached to the outer body so as to extend from a front portion of the waist region through the crotch area to a rear portion of the waist region; The absorbent body is incorporated in the inner body, The exterior body is formed by laminating a plurality of sheet layers, the post-treatment tape is interposed between adjacent sheet layers of the exterior body, The sheet layer overlapping the outside of the post-treatment tape in the exterior body has a slit for pulling out the post-treatment tape to the outside, an opening for exposing the post-treatment tape to the outside, or a perforation for forming these. A pants-type disposable absorbent article according to any one of the first to third aspects.

[0013] (Action and effect) When the post-treatment tape is built into the exterior body, the post-treatment tape is pressed against the absorbent body side, so that an increase in the thickness of the product can be further suppressed. In addition, since the post-treatment tape is hidden while the article is being worn, unlike a general post-treatment tape that is exposed to the outside, it is possible to prevent the post-treatment tape from getting caught on clothing, toys, and other objects. Furthermore, it is not necessary to provide a joining means on the adjacent surface of the folded-back post-treatment tape, in which case an increase in the thickness of the product can be further suppressed. In addition, in the case of pants-type disposable wearing articles, the sheet layer of the exterior body is often colored, or a sheet layer on which a design such as a character is printed is interposed in the exterior body, and in such cases, it is preferable to place the post-treatment tape on the absorbent body side of these sheet layers, since the post-treatment tape does not interfere with the appearance of the coloring, design, etc. After use, the post-treatment tape can be used by pulling it out or exposing it to the outside.

[0014] <Fifth aspect> At least one of the sheet layers located between the absorbent body and the after-treatment tape has a portion overlapping with the recessed region cut out or compressed in the thickness direction so as to be thinner than the surrounding area. A pants-type disposable absorbent article according to any one of the first to fourth aspects.

[0015] (Action and effect) According to this embodiment, an increase in the product thickness can be further suppressed, which is preferable. Effect of the Invention

[0016] The present invention provides the advantage that an increase in product thickness due to the post-treatment tape is suppressed. [Brief description of the drawings]

[0017] [Figure 1] FIG. 2 is a plan view showing the inner surface of the pants-type disposable swimsuit in an open state. [Diagram 2] FIG. 2 is a plan view showing the outer surface of the pants-type disposable swimsuit in an open state. [Diagram 3] 2 is a cross-sectional view of FIG. 1 along line 2-2. [Figure 4] 3 is a cross-sectional view of FIG. 1 along line 3-3. [Diagram 5] 1(a) is a cross-sectional view taken along line 4-4 in FIG. 1, and FIG. [Figure 6] FIG. 1 is a perspective view of a pants-type disposable swimsuit. [Figure 7] This is a plan view showing only the essential parts of the outer surface of the pants-type disposable swimsuit in an open state. [Figure 8] 3 is a cross-sectional view of FIG. 1 along line 3-3. [Figure 9] 1(a) is a cross-sectional view taken along line 4-4 in FIG. 1, and FIG. [Figure 10] 1(a) is a cross-sectional view taken along line 4-4 in FIG. 1, and FIG. [Figure 11] FIG. [Figure 12] FIG. [Figure 13] FIG. 2 is a plan view showing the outer surface of the pants-type disposable swimsuit in an open state. [Figure 14] FIG. 2 is a plan view showing the outer surface of the pants-type disposable swimsuit in an open state. [Figure 15] 1(a) is a cross-sectional view taken along line 4-4 in FIG. 1, and FIG. [Figure 16] 3 is a cross-sectional view of FIG. 1 along line 3-3. [Figure 17] FIG. [Figure 18] FIG. 2 is a perspective view showing a state in which a pants-type disposable diaper is being post-treated. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] An example of a pants-type disposable swimsuit will be described in detail below with reference to the attached drawings. Each component adjacent in the thickness direction is fixed or joined as necessary in the same manner as known diapers, except for the fixed or joined parts described below. The dotted parts in the cross-sectional view indicate an adhesive such as a hot melt adhesive as the fixing or joining means. The hot melt adhesive can be applied by known methods such as slot application, continuous line or dotted line bead application, spiral, Z-shaped, wavy, etc. spray application, or pattern coating (transfer of hot melt adhesive by letterpress printing). Alternatively or in addition to this, at the fixing part of the elastic member, the hot melt adhesive can be applied to the outer circumferential surface of the elastic member to fix the elastic member to the adjacent member. As the hot melt adhesive, for example, EVA-based, adhesive rubber-based (elastomer-based), olefin-based, polyester-polyamide-based, and other types are available, but they can be used without any particular limitation. As the fixing or joining means for joining each component, material welding means such as heat sealing and ultrasonic sealing can also be used. In a portion where liquid permeability in the thickness direction is required, adjacent components in the thickness direction are fixed or joined in an intermittent pattern. For example, when such intermittent fixing or joining is performed with a hot melt adhesive, intermittent pattern coating in a spiral, Z-shape, wave shape, etc. can be suitably used, and when coating an area greater than the coating width of one nozzle, intermittent pattern coating in a spiral, Z-shape, wave shape, etc. can be performed with or without gaps in the width direction. As a joining means for joining each component, material welding means such as heat sealing and ultrasonic sealing can also be used.

[0019] In addition, as the nonwoven fabric in the following description, known nonwoven fabrics can be appropriately used depending on the part and purpose. The constituent fibers of the nonwoven fabric can be selected without particular limitation from synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, polyamides, etc. (including single-component fibers and composite fibers such as core-sheath fibers), regenerated fibers such as rayon and cupra, natural fibers such as cotton, etc., and these can also be used in combination. In order to increase the flexibility of the nonwoven fabric, it is preferable to use crimped fibers as the constituent fibers. In addition, the constituent fibers of the nonwoven fabric can be hydrophilic fibers (including fibers that have been made hydrophilic by a hydrophilizing agent), hydrophobic fibers, or water-repellent fibers (including fibers that have been made water-repellent by a water-repellent agent). Furthermore, nonwoven fabrics are generally classified according to the length of the fibers, the sheet formation method, the fiber bonding method, and the laminated structure into staple fiber nonwoven fabrics, long fiber nonwoven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, thermal bond (air-through) nonwoven fabrics, needle punched nonwoven fabrics, point bond nonwoven fabrics, laminated nonwoven fabrics (including SMS nonwoven fabrics and SMMS nonwoven fabrics in which a meltblown layer is sandwiched between spunbond layers), and the like, and any of these nonwoven fabrics can be used.

[0020] 1 to 6 show an example of a pants-type disposable swimsuit. This pants-type disposable swimsuit includes a rectangular front exterior body 12F constituting at least the waist region T of the front body F, a rectangular rear exterior body 12B constituting at least the waist region T of the rear body B, and an inner body 200 attached to the exterior bodies 12F, 12B so as to extend from the front exterior body 12F through the crotch area to the rear exterior body 12B. Both sides of the front exterior body 12F and both sides of the rear exterior body 12B are joined to form side seal parts 12A, and an opening formed by the front and rear ends of the exterior bodies 12F, 12B becomes a waist opening WO through which the wearer's torso passes, and the parts on both sides of the inner body 200 in the width direction surrounded by the lower edges of the exterior bodies 12F, 12B and the side edges of the inner body 200 become leg openings LO through which the legs pass. The inner body 200 is a portion that absorbs and retains excrement such as urine, and the outer bodies 12F, 12B are portions that support the inner body 200 against the wearer's body. Also, the symbol Y indicates the overall length of the swimsuit in the unfolded state (the length in the front-to-rear direction from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the back body B), and the symbol X indicates the overall width of the swimsuit in the unfolded state.

[0021] In this pants-type disposable swimsuit, the tubular waist region T, which is continuous in the waist direction, is determined as a front-rear range having the side seal portion 12A (front-rear range from the waist opening WO to the upper end of the leg opening LO). Also, the middle region L, which extends from the lower end of the front part of the waist region through the crotch part to the lower end of the rear part of the waist region, is determined as a front-rear range of the part forming the leg opening LO (between the front-rear region having the side seal portion 12A of the front body F and the front-rear region having the side seal portion 12A of the rear body B). The waist region T can be conceptually divided into a "waist portion" W, which forms the edge of the waist opening, and a "lower waist portion" U, which is the part below the "waist portion" W. Usually, when the waist region T has a boundary where the stretch stress in the width direction WD changes (for example, the thickness or elongation rate of the elastic member changes), the waist portion W is the part closer to the waist opening WO than the boundary closest to the waist opening WO, and when there is no such boundary, the part extending toward the waist opening WO side from the absorbent body 56 or the inner body 200 is the waist portion W. These front-rear lengths vary depending on the size of the product and can be determined appropriately, but as an example, the waist part W can be 15 to 40 mm, and the lower waist part U can be 65 to 120 mm. On the other hand, both side edges of the middle region L are narrowed in a U-shape or curved shape so as to fit around the legs of the wearer, and these are the areas where the wearer's legs are inserted. As a result, the pants-type disposable swimsuit in the opened state has a generally hourglass shape.

[0022] (Interior body) The inner body 200 can have any shape, but is rectangular in the illustrated form. As shown in Figures 3 to 5, the inner body 200 comprises a top sheet 30 that contacts the wearer's skin, a liquid-impermeable sheet 11, and an absorbent element 50 interposed therebetween. Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer liquid that has permeated the top sheet 30 to the absorbent element 50, and reference numeral 60 denotes rising gathers 60 that extend from both sides of the inner body 200 so as to contact the wearer's skin in order to prevent excrement from leaking to both sides of the inner body 200.

[0023] (Top sheet) The top sheet 30 has a property of being permeable to liquid, and examples of the top sheet 30 include a perforated or non-perforated nonwoven fabric, a perforated plastic sheet, etc. Both side portions of the top sheet 30 may be folded back to the back side at the side edges of the absorbent element 50, or may not be folded back and may extend beyond the side edges of the absorbent element 50.

[0024] The top sheet 30 is desirably fixed to an adjacent member on the back side by a joining means that uses material welding such as heat sealing or ultrasonic sealing, or by a hot melt adhesive, in order to prevent the top sheet 30 from shifting relative to the member on the back side, etc. In the illustrated example, the top sheet 30 is fixed to the front surface of the intermediate sheet 40 and the surface of the portion of the packaging sheet 58 that is located on the front side of the absorbent body 56 by a hot melt adhesive applied to the back surface of the top sheet 30.

[0025] (middle seat) The intermediate sheet 40 is joined to the back surface of the top sheet 30 in order to quickly move excreted liquid that has passed through the top sheet 30 to the absorbent body 56 and to prevent it from flowing back. The intermediate sheet 40 and the top sheet 30 can be joined together using a hot melt adhesive, heat embossing or ultrasonic welding.

[0026] As the intermediate sheet 40, a resin film having a large number of through holes can be used in addition to using a nonwoven fabric. The same material as that of the top sheet 30 can be used as the nonwoven fabric, but a material having higher hydrophilicity than the top sheet 30 or a material having a higher fiber density is preferred because it has excellent liquid transfer characteristics from the top sheet 30 to the intermediate sheet 40. For example, an air-through nonwoven fabric can be suitably used as the intermediate sheet 40. For the air-through nonwoven fabric, it is preferred to use composite fibers with a core-sheath structure, and in this case, the resin used for the core may be polypropylene (PP), but polyester (PET) with high rigidity is preferred. The basis weight is 17 to 80 g / m 2 is preferable, and 25 to 60 g / m 2The thickness of the raw fiber of the nonwoven fabric is preferably 2.0 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use eccentric fibers, hollow fibers, or eccentric and hollow fibers as all or part of the raw fiber mixture in order to make the nonwoven fabric bulky.

[0027] In the illustrated example, the intermediate sheet 40 is positioned in the center and is shorter than the width of the absorbent body 56, but it may be provided across the entire width. The length of the intermediate sheet 40 in the front-to-rear direction may be the same as the length of the inner body 200 or the absorbent element 50, or may be within a short length range centered on the region that receives liquid.

[0028] The intermediate sheet 40 is desirably fixed to the adjacent member on the rear side by a joining means such as heat sealing or ultrasonic sealing that uses material welding, or by a hot melt adhesive, in order to prevent the intermediate sheet 40 from being misaligned with respect to the member on the rear side. In the illustrated example, the intermediate sheet 40 is fixed to the surface of the portion of the packaging sheet 58 that is located on the front side of the absorbent body 56 by a hot melt adhesive applied to the rear side.

[0029] (Liquid-impermeable sheet) The material of the liquid-impermeable sheet 11 is not particularly limited, but examples thereof include plastic films made of olefin resins such as polyethylene and polypropylene, laminated nonwoven fabrics in which a plastic film is provided on the surface of a nonwoven fabric, and laminated sheets in which a nonwoven fabric is laminated and bonded to a plastic film. For the liquid-impermeable sheet 11, it is preferable to use a material that is liquid-impermeable and moisture-permeable, which is preferred from the viewpoint of preventing stuffiness. As a moisture-permeable plastic film, a microporous plastic film obtained by kneading an inorganic filler into an olefin resin such as polyethylene or polypropylene to form a sheet and then stretching it in a uniaxial or biaxial direction is widely used. In addition, a sheet that has been made liquid-impermeable without using a plastic film by a method such as a nonwoven fabric using microdenier fibers, a method of strengthening leakproofness by applying heat or pressure to reduce the voids in the fibers, or a method of coating with a highly water-absorbent resin or a hydrophobic resin or a water-repellent agent can also be used as the liquid-impermeable sheet 11.

[0030] The liquid-impermeable sheet 11 is made wide enough to fit on the back side of the absorbent element 50 as shown in the figure, but in order to improve leak-proofing, it can also be made to wrap around both sides of the absorbent element 50 and extend to both sides of the top sheet 30 side of the absorbent element 50.

[0031] (Rising Gathers) The rising gathers 60 extend along both sides of the inner body 200 throughout the front-to-rear direction LD and are provided to come into contact with the wearer's skin to prevent side leakage, and include what are generally called three-dimensional gathers.

[0032] 1, 3 and 4 are so-called three-dimensional gathers, which rise from the side of the inner body 200 to the front side. The rise gathers 60 have a base side portion 60B that rises obliquely toward the widthwise center, and a tip side portion 60A that rises obliquely from the middle portion toward the widthwise outer side, but are not limited to this and can be appropriately modified, such as a form in which the gathers rise as a whole toward the widthwise center.

[0033] More specifically, the rising gathers 60 in the illustrated example are formed by folding back a strip-shaped gathered nonwoven fabric 62 having a length equal to the front-rear length of the inner body 200 in the width direction WD at its tip portion and folding it in two, and fixing a plurality of elongated gathered elastic members 63 at intervals in the width direction WD between the folded-back portion and the sheet in the vicinity thereof in a stretched state along the longitudinal direction. The base end portion of the rising gathers 60 located opposite the tip portion (the end portion opposite the folded-back portion of the sheet in the width direction WD) is a root portion 65 fixed to the side portion on the back side of the liquid-impermeable sheet 11 in the inner body 200, and the portion other than this root portion 65 is a main portion 66 (portion on the folded-back portion side) extending from the root portion 65. The main body portion 66 has a root side portion 60B extending toward the center in the width direction, and a tip side portion 60A that is folded back at the tip of the root side portion 60B and extends outward in the width direction. This form is a surface contact type of risen gather 60, but a line contact type of risen gather 60 that is not folded back outward in the width direction can also be used. The front-to-rear direction both end portions of the main body portion 66 are laid down portions 67 that are fixed to the side surfaces of the top sheet 30 in a laid down state, while the front-to-rear direction intermediate portion located between them is an unfixed free portion 68, and a gather elastic member 63 extending along the front-to-rear direction LD is fixed in a stretched state to at least the tip portion of this free portion 68.

[0034] In the rising gathers 60 configured as described above, the contractile force of the gather elastic member 63 acts to bring the front-rear end portions closer together, but while the front-rear end portions of the main body portion 66 are fixed so as not to stand up, the portion between them is an unfixed free portion 68, so that only the free portion 68 stands up to abut against the body side as shown by the arrow in Fig. 3. In particular, when the root portion 65 is located on the back side of the inner body 200, the free portion 68 stands up to open outward in the width direction in the crotch area and its vicinity, so that the rising gathers 60 come into surface contact with the leg circumference, improving the fit.

[0035] In the illustrated example of the raised gathers 60, in a bent form in which the main body portion 66 is made up of a root portion 60B extending toward the center in the width direction and a tip portion 60A folded back at the tip of the root portion 60B and extending outward in the width direction, the tip portion 60A and the root portion 60B are joined in a fallen state at the fallen portion 67, and the root portion 60B is joined in a fallen state to the top sheet 30. At least one of various application methods of hot melt adhesives and material welding means such as heat sealing and ultrasonic sealing can be used to join the opposing surfaces at the fallen portion 67. In this case, the joining of the root portion 60B and the top sheet 30 and the joining of the tip portion 60A and the root portion 60B may be performed by the same means or by different means. For example, in one preferred embodiment, the base portion 60B and the top sheet 30 are joined by a hot melt adhesive, and the tip portion 60A and the base portion 60B are joined by material welding.

[0036] As the gathered nonwoven fabric 62, a nonwoven fabric that is soft and has excellent uniformity and hiding properties, such as a spunbond nonwoven fabric (SS, SSS, etc.), an SMS nonwoven fabric (SMS, SSMMS, etc.), or a meltblown nonwoven fabric, and that is treated with a water repellent treatment using silicone or the like as necessary, can be suitably used. The fiber basis weight is 10 to 30 g / m 2 It is preferable that the thickness is about 470 to 1240 dtex, and more preferably 620 to 940 dtex. The elongation rate at the time of fixing is preferably 150 to 350%, and more preferably 200 to 300%. As shown in the figure, a waterproof film 64 can be interposed between the gathered nonwoven fabric 62 folded in two. In this case, the gathered nonwoven fabric 62 can be partially omitted where the waterproof film 64 is present. However, in order to make the product look and feel like cloth, it is necessary that at least the outer surface of the rising gathers 60 from the base end to the tip end is formed of the gathered nonwoven fabric 62, as in the example shown in the figure.

[0037] The number of gather elastic members 63 provided in the free portion of the rising gathers 60 is preferably 2 to 6, and more preferably 3 to 5. The appropriate arrangement interval 60d is 3 to 10 mm. With this arrangement, the gather elastic members 63 can easily come into contact with the skin in a surface area within the range in which they are arranged. The gather elastic members 63 may be arranged not only on the tip side but also on the base side.

[0038] In the free portion 68 of the rising gather 60, at least one of hot melt adhesives applied by various application methods and material welding fixing means such as heat sealing and ultrasonic sealing can be used to bond the inner layer and the outer layer of the gathered nonwoven fabric 62 together and to fix the gathered elastic member 63 sandwiched therebetween. If the entire surfaces of the inner layer and the outer layer of the gathered nonwoven fabric 62 are bonded together, flexibility is lost, so it is preferable that the parts other than the bonding parts of the gathered elastic member 63 are not bonded or are weakly bonded. In the illustrated example, a hot melt adhesive is applied only to the outer peripheral surface of the gathered elastic member 63 by an application means such as a comb gun or a surwrap nozzle, and the gathered elastic member 63 is sandwiched between the inner layer and the outer layer of the gathered nonwoven fabric 62, so that the gathered elastic member 63 is fixed to the inner layer and the outer layer of the gathered nonwoven fabric 62 and the inner layer and the outer layer of the gathered nonwoven fabric 62 are fixed only by the hot melt adhesive applied to the outer peripheral surface of the gathered elastic member 63.

[0039] Similarly, the waterproof film 64 incorporated in the rising gathers 60 can be fixed to the gathered nonwoven fabric 62, and the fallen portion 67 can be fixed using at least one of hot melt adhesives applied by various application methods and material welding means such as heat sealing or ultrasonic sealing.

[0040] The dimensions of the rising gathers 60 in the illustrated example can be determined as appropriate, but in the case of a disposable swimsuit for infants, for example, as shown in Figure 3, the rising height W2 of the rising gathers 60 (the widthwise length of the main body portion 66 in the unfolded state) is preferably 15 to 60 mm, and particularly preferably 20 to 40 mm. Furthermore, when the rising gathers 60 are folded flat so as to be parallel to the surface of the top sheet 30, the distance W1 between the innermost folds is preferably 60 to 190 mm, and particularly preferably 70 to 140 mm.

[0041] (Absorption element) The absorbent element 50 has an absorbent body 56 and a wrapping sheet 58 that wraps the entire absorbent body 56. The wrapping sheet 58 may be omitted.

[0042] (Absorbent) The absorbent body 56 can be formed by a fiber assembly. As the fiber assembly, in addition to stacked staple fibers such as cotton-like pulp or synthetic fibers, a filament assembly obtained by opening a tow (fiber bundle) of synthetic fibers such as cellulose acetate as required can be used. When stacking cotton-like pulp or staple fibers, the fiber weight is, for example, 100 to 300 g / m 2 In the case of a filament aggregate, for example, the weight is 30 to 120 g / m 2 The fineness of the synthetic fibers is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex. In the case of a filament aggregate, the filaments may be non-crimped fibers, but are preferably crimped fibers. The degree of crimp of the crimped fibers can be, for example, about 5 to 75, preferably 10 to 50, and more preferably 15 to 50, per 2.54 cm. Uniformly crimped fibers can be used. It is preferable to disperse and hold high-absorbent polymer particles in the absorbent body 56.

[0043] The absorbent body 56 may be rectangular in shape, but as shown in the illustrated example, it is preferable that the absorbent body 56 has an hourglass shape with a narrower constricted portion in the middle in the front-to-back direction than either side of the front or back, as this improves the fit of the absorbent body 56 itself and the rising gathers 60 around the legs.

[0044] The dimensions of the absorber 56 can be determined as appropriate as long as it extends from the front to the back and the left to the right of the urination opening position, but it is preferable that it extends to the peripheral edge of the inner body 200 or its vicinity in the front-back direction LD and the width direction WD.

[0045] (Superabsorbent polymer particles) It is preferable that the absorbent body 56 does not contain a superabsorbent polymer, but it can contain one. The superabsorbent polymer particles include "powder" as well as "particles". As the superabsorbent polymer particles, known ones can be used as they are. For example, it is preferable that the ratio of particles remaining on a 500 μm standard sieve (JIS Z8801-1:2006) when sieved (shaking for 5 minutes) is 30% by weight or less, and it is also preferable that the ratio of particles remaining on a 180 μm standard sieve (JIS Z8801-1:2006) when sieved (shaking for 5 minutes) is 60% by weight or more.

[0046] The material of the superabsorbent polymer particles is not particularly limited, but preferably has a water absorption of 40 g / g or more. The superabsorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based materials, and may be starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, crosslinked products of sodium carboxymethylcellulose, and acrylic acid (salt) polymers. The shape of the superabsorbent polymer particles is preferably a powder-like shape that is commonly used, but other shapes may also be used.

[0047] The highly absorbent polymer particles preferably have a water absorption speed of 70 seconds or less, particularly 40 seconds or less. If the water absorption speed is too slow, the liquid supplied into the absorbent body 56 tends to flow back out of the absorbent body 56, which is called backflow.

[0048] Moreover, the highly absorbent polymer particles preferably have a gel strength of at least 1000 Pa. This makes it possible to effectively prevent the sticky feeling after absorbing liquid, even when the absorbent body 56 is bulky.

[0049] (packaging sheet) When the wrapping sheet 58 is used, the material that can be used is tissue paper, particularly crepe paper, nonwoven fabric, polylaminated nonwoven fabric, a sheet with small holes, etc. However, it is preferable that the sheet does not allow the superabsorbent polymer particles to escape. When using nonwoven fabric instead of crepe paper, hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material that can be used is polypropylene, polyethylene / polypropylene composite, etc. The basis weight is 5 to 40 g / m 2 , especially 10 to 30 g / m 2 It is preferable that the following be used.

[0050] The packaging form of the packaging sheet 58 can be determined as appropriate, but from the standpoint of ease of manufacture and preventing leakage of superabsorbent polymer particles from the front and rear edges, it is preferable to wrap it around the front, back, and both side surfaces of the absorbent 56 in a cylindrical shape, with the front and rear edges extending beyond the front and rear of the absorbent 56, and to join the overlapping parts of the wrapped sheet and the overlapping parts of the protruding front and rear edges by a joining means such as a hot melt adhesive or material welding.

[0051] (Exterior body) The exterior bodies 12F, 12B in the illustrated example are composed of a rectangular front exterior body 12F which is a portion constituting at least the waist region T of the front body F, and a rectangular back exterior body 12B which is a portion constituting at least the waist region T of the back body B, and the front exterior body 12F and the rear exterior body 12B are not continuous on the crotch side, but are separated in the front-to-back direction LD. This separation distance 12d can be, for example, about 150 to 250 mm. Also, as shown in FIG. 7, the exterior body 12 may be continuous from the front body F to the back body B through the crotch. In this case, the exterior body forms the waist region and the middle region.

[0052] In the illustrated example, the rear exterior body 12B has a longer front-to-rear dimension than the front exterior body 12F, and the front exterior body 12F does not have a portion corresponding to the middle region L, but the rear exterior body 12B has a buttocks covering portion C extending from the waist region T toward the middle region L. Although not illustrated, the front exterior body 12F may also be provided with a groin covering portion extending from the waist region T toward the middle region L. Also, although not illustrated, both the front exterior body 12F and the rear exterior body 12B do not have to have a portion extending from the waist region T toward the middle region L (the front-to-rear dimensions of the front exterior body 12F, the rear exterior body 12B, and the side seal portion may all be the same).

[0053] When the buttocks cover portion C is provided, the length of the rear exterior body 12B in the front-rear direction LD can be determined appropriately, for example, to be 1.1 to 1.5 times the length of the side seal portion 12A in the front-rear direction LD.

[0054] As shown in Fig. 4 and Fig. 5, the exterior bodies 12F, 12B are formed by bonding an outer sheet layer and an inner sheet layer adjacent to the outer side and the inner side of the elastic members 15-19 described later, respectively, by a bonding means such as a hot melt adhesive or welding. The outer sheet layer and the inner sheet layer can be formed of two sheets 12S, 12H as in the example shown in Fig. 5 and the example shown in Fig. 15, or can be formed of a single sheet material 12S as shown in Fig. 10. That is, in the latter case, in part or all of the exterior bodies 12F, 12B, the inner sheet layer and the outer sheet layer are respectively formed by the inner part and the outer part of a single sheet material 12S folded back at the edge of the waist opening WO (which may be the edge on the crotch side). In the example shown in Fig. 5, the sheet material 12H forming the inner sheet layer extends only to the lower end of the waist portion, but the sheet material 12S forming the outer sheet layer is folded around the waist opening WO side of the sheet material 12H of the inner sheet layer and folded back inward, and this folded back portion 12r extends so as to cover the end of the inner body 200 on the waist opening WO side. In this case, in most of the waist portion W, the sheet material forming the outer sheet layer and the sheet material forming the inner sheet layer are a single sheet material 12S, and in the other parts, they are separate sheet materials 12S, 12H. On the other hand, in the example shown in Fig. 9, the sheet material 12H forming the inner sheet layer extends only to the edge of the waist opening WO, but the sheet material 12S forming the outer sheet layer is folded around the edge of the waist opening WO side of the sheet material 12H of the inner sheet layer and folded back inward, and this folded back portion 12r extends so as to cover the end of the inner body 200 on the waist opening WO side.

[0055] The sheet materials 12S, 12H used for the outer sheet layer and the inner sheet layer can be used without any particular limitation, but nonwoven fabric is preferable. When nonwoven fabric is used, the fiber basis weight is 10 to 30 g / m 2 It is preferable to set the temperature to about 100°C.

[0056] (Stretchable area / non-stretchable area) In order to improve the fit around the waist of the wearer, the exterior bodies 12F and 12B are provided with elastic members 15-19 between the outer sheet layer and the inner sheet layer, and an elastic region A2 is formed that elastically stretches in the width direction WD with the elastic members 15-19. In the elastic region A2, in the natural length state, the outer sheet layer, the inner sheet layer, and the sheet layer bonded thereto shrink with the elastic members 15-19 shrinking, forming wrinkles or folds, and when the elastic members 15-19 are stretched in the longitudinal direction, the outer sheet layer, the inner sheet layer, and the sheet layer bonded thereto can be stretched to a predetermined elongation rate at which the outer sheet layer, the inner sheet layer, and the sheet layer bonded thereto are fully stretched without wrinkles. As the elastic members 15-19, in addition to elongated elastic members such as thread rubber (illustrated example), known elastic members such as strips, nets, films, etc. can be used without any particular limitation. As the elastic members 15-19, synthetic rubber or natural rubber may be used.

[0057] At least one of hot melt adhesives applied by various coating methods and material welding fixing means such as heat sealing and ultrasonic sealing can be used to bond adjacent sheet layers in the thickness direction of exterior bodies 12F, 12B and fix elastic members 15-19 sandwiched therebetween. For example, elastic members 15-19 may be fixed to the outer sheet layer and inner sheet layer only at both ends in the stretch direction in the stretch region, or hot melt adhesive may be applied only to the portions through which elastic members 15-19 pass, to fix elastic members 15-19 to the outer sheet layer and inner sheet layer and to fix outer sheet layer and inner sheet layer together. However, in the case of disposable swimsuits, it is desirable for the swimsuit to maintain sufficient strength even after immersion in water, so it is preferable to apply hot melt adhesive in a planar or spiral pattern to one of the opposing surfaces of the outer sheet layer and the inner sheet layer, and also apply hot melt adhesive to the outer peripheral surfaces of the elastic members 15-19 using an application means such as a comb gun or a SureWrap nozzle, and then sandwich the elastic members 15-19 between the outer sheet layer and the inner sheet layer, thereby fixing the elastic members 15-19 to the outer sheet layer and the inner sheet layer and joining the outer sheet layer and the inner sheet layer.

[0058] To explain the elastic members 15-19 in the illustrated example in more detail, a plurality of waist elastic members 17 are attached at intervals in the front-rear direction between the outer sheet layer and the inner sheet layer in the waist portion W of the outer bodies 12F, 12B so as to be continuous over the entire width direction WD. Of the waist elastic members 17, one or more arranged in the area adjacent to the waist lower portion U may overlap the inner body 200, or may be provided on both sides in the width direction except for the width direction central portion overlapping with the inner body 200. The waist elastic member 17 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber; in the case of natural rubber, a cross-sectional area of ​​0.05 to 1.5 mm 2 , especially 0.1 to 1.0 mm 2 It is preferable to provide about 3 to 22 rubber threads of about 1.5 mm each at intervals of 4 to 12 mm, and the resulting stretchability in the width direction WD of the waist portion W is preferably about 150 to 400%, and particularly about 220 to 320%. Also, it is not necessary for the waist portion W to use waist elastic members 17 of the same thickness or to have the same stretchability in all of its front-to-back directions LD, and for example, the thickness or stretchability of the elastic members 17 may be different in the upper and lower parts of the waist portion W.

[0059] Between the outer sheet layer and the inner sheet layer in the waist lower portion U of the exterior bodies 12F, 12B, a plurality of waist lower elastic members 15, 19 made of elongated elastic members are attached at intervals in the front-rear direction.

[0060] The lower waist elastic members 15, 19 have a thickness of 155 to 1880 dtex, particularly 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm 2 , especially 0.1 to 1.0 mm 2 It is preferable to provide about 5 to 30 rubber threads (approximately 15 mm long) at intervals of 1 to 15 mm, especially 3 to 8 mm, and the resulting elongation rate of the waist lower portion U in the width direction WD is preferably about 200 to 350%, especially about 240 to 300%.

[0061] In addition, a cover elastic member 16 made of an elongated elastic member is attached between the outer sheet layer and the inner sheet layer in the buttocks covering portion C of the rear exterior body 12B. The buttocks covering portion C is contracted toward the center in the width direction WD by the cover elastic member 16.

[0062] The cover elastic member 16 has a thickness of 155 to 1880 dtex, particularly 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm 2 , especially 0.1 to 1.0 mm 2 It is preferable to provide a rubber thread of about 150 to 400%, and more preferably 250 to 350%, in order to provide an elongation rate of the buttocks-covering part C in the width direction WD of the buttocks-covering part C. The number of the cover-part elastic members 16 can be determined appropriately, but is preferably 3 to 10, and more preferably 3 to 5.

[0063] On the other hand, when a groin cover portion is provided on the front exterior body 12F, a cover portion elastic member can be provided in the same manner as the buttocks cover portion C.

[0064] When the elastic members 15, 16, 19 are provided in the front-rear range having the absorbent body 56, as in the illustrated example of the lower waist portion U and the buttocks-covering portion C, in order to prevent contraction of the absorbent body 56 in the width direction WD in part or all of the absorbent body 56, the widthwise middle including part or all of the part overlapping with the absorbent body 56 in the width direction WD (preferably including the entire inner and outer joining portions 201, 202) is made into a non-elastic region A1, and both sides in the width direction are made into elastic regions A2. It is preferable that the waist portion W is made into an elastic region A2 over the entire width direction WD, but as with the lower waist portion U, a non-elastic region A1 may be provided in the widthwise middle.

[0065] Such stretchable region A2 and non-stretchable region A1 can be constructed by providing elastic members 15-17, 19 between the inner sheet layer and the outer sheet layer, fixing the elastic members 15, 16, 19 at least at both ends in the stretch direction in the stretchable region A2 using a hot melt adhesive, but not fixing them in the region that will become the non-stretchable region A1, and cutting the elastic members 15, 16, 19 in the region that will become the non-stretchable region A1 at one location in the middle of the width direction using pressure and heat, or cutting them into multiple small locations, so as to retain stretchability in the stretchable region A2 while eliminating stretchability in the non-stretchable region A1. In the former case, as shown in FIG. 4, in the non-stretchable region A1, the cut remnants continuing from the elastic members 15, 16, 19 of the stretchable region A2 remain between the outer sheet layer and the inner sheet layer in a state in which they have individually shrunk to their natural length as unnecessary elastic members 18. In the latter case, although not shown, the cut remnants continuing from the elastic members 15, 16, 19 of the stretchable region A2 and cut pieces of elastic members that are not continuing from the elastic members 15, 16, 19 of both stretchable regions A2 remain between the outer sheet layer and the inner sheet layer in a state in which they have individually shrunk to their natural length as unnecessary elastic members 18.

[0066] (Non-woven cover) In a pants-type disposable absorbent article with a two-piece exterior, the inner body 200 is exposed between the front outer body 12F and the rear outer body 12B, so it is preferable to have a cover nonwoven fabric 13 that covers the back surface of the inner body 200 from between the front outer body 12F and the inner body 200 to between the rear outer body 12B and the inner body 200 so that the liquid-impermeable sheet 11 is not exposed on the back surface of the inner body 200.

[0067] The nonwoven fabric used for the cover nonwoven fabric 13 can be appropriately selected from the same material as that of the exterior bodies 12F and 12B, for example.

[0068] The front-rear direction range of the cover nonwoven fabric 13 is not particularly limited, and may extend in the front-rear direction LD over the entire area from the front end to the rear end of the inner body 200 as shown in Fig. 2 and Fig. 5, or may extend in the front-rear direction LD from the front-rear direction middle position of the area where the front exterior body 12F and the inner body 200 overlap to the front-rear direction middle position of the area where the rear exterior body 12B and the inner body 200 overlap as shown in Fig. 9. In the example shown in Fig. 9, the front-rear direction length 13y of the overlapping portion between the cover nonwoven fabric 13 and the front exterior body 12F and the front-rear direction length 13y of the overlapping portion between the cover nonwoven fabric 13 and the rear exterior body 12B can be appropriately determined, but usually can be about 20 to 40 mm each.

[0069] The width direction range of the cover nonwoven fabric 13 is set to a range capable of hiding the exposed back surface portion of the liquid-impermeable sheet 11. For this reason, in the illustrated example, since the liquid-impermeable sheet 11 is exposed between the base ends of the left and right rising gathers 60, the cover nonwoven fabric 13 is provided so as to cover at least the width direction range from the back side of the base end of one rising gather 60 to the back side of the base end of the other rising gather 60. This allows the liquid-impermeable sheet 11 to be hidden by the cover nonwoven fabric 13 and the gathered nonwoven fabric 62 of the rising gathers 60. Also, even if the width direction ends of the cover nonwoven fabric 13 do not cover the back sides of the base ends of the rising gathers 60, but the gathered nonwoven fabric 62 covers the back sides of the width direction ends of the cover nonwoven fabric 13, it is possible for the cover nonwoven fabric 13 and the gathered nonwoven fabric 62 to hide the liquid-impermeable sheet 11. In this case, since both side edges of the cover nonwoven fabric 13 are covered with the gathered nonwoven fabric 62, there is an advantage that both side edges of the cover nonwoven fabric 13 are less likely to peel off from the liquid-impermeable sheet 11.

[0070] The inner and outer surfaces of the cover nonwoven fabric 13 can be bonded to the opposing surfaces via a hot melt adhesive. The fixed area of ​​the cover nonwoven fabric 13 can be the entire front-rear direction and the entire width direction of the cover nonwoven fabric 13, or a part of the fixed area can be left unfixed. For example, if both ends of the width direction of the cover nonwoven fabric 13 are unfixed, the cover nonwoven fabric 13 is less susceptible to the influence of the rising gathers 60 even if the sides of the absorbent body 56 are somewhat shrunk, which is advantageous in that wrinkles and folds are less likely to form in the cover nonwoven fabric 13. In this case, the width of the unfixed parts of both ends of the width direction of the cover nonwoven fabric 13 can be appropriately determined, and can be, for example, 3 to 10 mm, preferably 5 to 8 mm.

[0071] (Internal and external joints) The inner body 200 can be fixed to the outer bodies 12F, 12B by a joining means using material welding such as heat sealing or ultrasonic sealing, or by a hot melt adhesive. In the illustrated example, the inner body 200 is fixed to the inner surface of the outer bodies 12F, 12B via a hot melt adhesive applied to the back surface of the inner body 200, that is, in this case, the back surface of the liquid-impermeable sheet 11 and the root portion 65 of the rising gathers 60. The inner and outer joining portions 201, 202 that fix the inner body 200 and the outer bodies 12F, 12B can be provided in almost the entire overlapping area as shown in FIG. 2, and can also be provided in a portion excluding both ends in the width direction of the inner body 200, for example.

[0072] (Post-treatment tape) The rear portion of the waist region T has a belt-like post-treatment tape 70 attached in a folded state by being folded back multiple times in the front-rear direction LD between the positions where it overlaps with the side edges of the absorbent body 56 and forward of the position where it overlaps with the rear end of the absorbent body 56. In the illustrated example, the post-treatment tape 70 is directly fixed to the outer surface of the exterior body 12, or to the outer surface of the rear exterior body 12B in the case of a pants-type disposable absorbent article with a two-part exterior, but it can also be indirectly connected via other members (the term "connection" in the present invention includes indirect connection in addition to direct fixing and connection). The post-treatment tape 70 can be fixed to the exterior body 12 by an adhesive 73 such as a synthetic rubber adhesive, a natural rubber adhesive, an acrylic resin adhesive, or a silicone resin adhesive so as not to peel off, as shown in FIG. 11, etc., or by other means such as a hook material of a mechanical fastener.

[0073] The post-treatment tape 70 is not particularly limited as long as it is attached in a folded state in which it is folded back multiple times in the front-rear direction LD. For example, the post-treatment tape 70 shown in Fig. 11 has a three-fold (Z-shaped cross section) structure formed by a first sheet S1, which is applied to the surface of the exterior body 12 side and fixed to the outer surface of the exterior body 12 by the adhesive 73, a second sheet S2 connected to the tip part of the first sheet S1 folded back outward, and a third sheet S3 fixed to the tip part of the second sheet S2 folded back outward, and the second sheet S2 is releasably adhered to the first sheet S1 by the adhesive 74 applied to the surface of the first sheet S1 side, and the third sheet S3 is releasably adhered to the second sheet S2 by the adhesive 75 applied to the surface of the second sheet S2 side. The surfaces of the sheets S1 to S3 opposite to the adhesives 74, 75 are treated with a release agent or the like to make them removable, and the adhesives 73, 74 and 74, 75 between the sheets S1 to S3 and the adhesive portions to the exterior body 12 are connected so as not to be peeled off. The tape S4 is connected to the leading end of the third sheet S3 by the adhesive 75 to form a tab 77. The tape S4 may be colored to make it easier to find. Although not shown, the leading end of the third sheet S3 may have a portion without the adhesive 75 to form the tab 77.

[0074] At the time of disposal, the diaper 100 is rolled or folded so that the top sheet 30 and the front body F are on the inside, and then the post-treatment tape 70 is peeled off and unfolded, and the rolled or folded diaper 100 is wrapped from the rear body B through the waist opening WO to the outer surface on the opposite side, as shown in Fig. 18, and fixed with the adhesive 75 of the third sheet S3. At this time, the adhesive 74 of the second sheet S2 is exposed to the outer surface, although not shown.

[0075] Although the dimensions of the post-treatment tape 70 are not particularly limited, taking into consideration pinching the tab 77 and rolling up the diaper 100 for fastening, the dimensions of the post-treatment tape 70 are preferably such that the length 70W in the width direction WD is 5 to 30 mm, and the total length when unfolded (excluding the sheet S1 fixed to the exterior body 12) is 100 to 300 mm. Also, the length 70L in the front-rear direction LD of the post-treatment tape 70 in the folded state is preferably 40 to 100 mm.

[0076] The post-treatment tape 70 has a laminated portion that is at least a portion that overlaps with the absorbent body 56. The laminated portion can be appropriately determined as long as it is between the positions where it overlaps with both side edges of the absorbent body 56 and is forward of the position where it overlaps with the rear end of the absorbent body 56, but if it is provided in only one place, it is preferably located in the center in the width direction WD. In addition, it is preferable that the attachment position of the post-treatment tape 70 is the non-stretchable region A1 of the exterior body 12 because this makes it easier to attach. The rear end of the folded post-treatment tape 70 may be separated from the rear end of the absorbent 56 toward the front in the fore-and-aft direction LD (as shown in the example), or the rear end of the post-treatment tape 70 may overlap the rear end of the absorbent 56, or a portion of the front side of the post-treatment tape 70 may have a laminated portion that overlaps with the absorbent 56, and the remaining portion may be located in an area where the absorbent 56 is not present, so that the post-treatment tape 70 straddles both the area where the absorbent 56 is present and the area where the absorbent 56 is not present.

[0077] The belt-shaped post-processing tape 70 can be formed by connecting a plurality of sheets S1 to S4 as shown in FIG. 11, or can be formed from a single sheet as shown in FIG. 12. When the post-processing tape 70 is formed by connecting a plurality of sheets, the number of sheets is not particularly limited, and the post-processing tape 70 can be formed from four sheets as shown in FIG. 11, five sheets (not shown), or fewer or more sheets. The number of sheets varies depending on the required length of the post-processing tape 70. In the following, each layer of the post-processing tape 70 with the folding position as a boundary therebetween is also referred to as a first portion D1, a second portion D2, and a third portion D3 in order from the root of the folded sheet. The number of times the post-processing tape 70 is folded can be appropriately determined taking into consideration the length of the post-processing tape 70, the thickness of the folded post-processing tape 70, and the like.

[0078] In the case where the pants-type disposable wearing article is a disposable swimsuit, if the adhesives 73 to 75 of the post-treatment tape 70, especially the adhesive 75, are adhesive products such as glue, such as synthetic rubber adhesives, natural rubber adhesives, acrylic resin adhesives, silicone resin adhesives, etc., their adhesive strength decreases when wetted with water, so that when the post-treatment tape 70 is wrapped around a rolled or folded disposable swimsuit and fixed when it is discarded after use, it may not be possible to fix it. In addition, there is a possibility that the folded post-treatment tape 70 may unfold during wearing, or the part fixed to the exterior body 12 may peel off. Therefore, in the post-treatment tape 70 for disposable swimsuits, it is preferable to use a hook material (male material) of a mechanical fastener (hook and loop fastener) whose adhesive strength is not affected even when wetted with water, instead of the adhesive 75 at least at the tip portion (the third portion D3 in the illustrated example). In this case, the means for attaching the second part D2 to the first part D1 and the means for fixing the first part D1 to the outer surface of the outer casing 12 can also be the hook material (male material) of a mechanical fastener (hook-and-loop fastener). However, since these are parts that are not used when rolling up and fixing the article after use, they can also be adhesive.

[0079] When using a hook member of a mechanical fastener as the fastening means for the post-treatment tape 70, it is preferable that the opposing surface of the hook member is made of nonwoven fabric or a loop member (female member) of the mechanical fastener and is joined to the opposing surface. For this reason, for example, in the example shown in Fig. 11, the sheets S1 to S3 can be made of nonwoven fabric, or the loop member of the mechanical fastener can be attached to the opposing surface of the sheets S1 to S3 facing the hook member.

[0080] (Concave area 71) As shown in Figs. 4 and 5, the diaper has a recessed area 71 without the absorbent 56 in a portion overlapping the entire laminated portion of the post-treatment tape 70 or in a wider area, and the thickness of the recessed area 71 excluding the post-treatment tape 70 is preferably thinner than the thickness of the area around the recessed area 71 that has the absorbent 56. This makes it possible to suppress an increase in product thickness caused by the post-treatment tape 70. As a result, when a large number of products are laminated in the thickness direction and enclosed in a packaging bag, the risk of a decrease in the number of products enclosed per bag can be reduced. In addition, the post-treatment tape 70 is less likely to get caught on clothing or objects while wearing the article. In particular, as described above, in the case of pants-type disposable swimsuits, it is preferable to use a hook material of a mechanical fastener as a joining means for fixing the post-treatment tape 70 to the outer surface of the product, but the thickness of the post-treatment tape 70 increases and becomes even thicker when folded, so it is preferable to provide the recessed area 71 when at least a part of the hook material is provided in the laminated portion of the post-treatment tape.

[0081] The difference between the thickness of the recessed region 71 excluding the post-treatment tape 70 and the thickness of the region surrounding the recessed region 71 having the absorbent 56 can be determined as appropriate, but it is preferable that the former is 0.25 to 0.75 times the latter. Also, it is preferable that the recessed region 71 of the diaper is recessed to some extent in the product state as in the illustrated example, and that part or all of the thickness of the post-treatment tape 70 is contained within the recessed region 71, but it is also acceptable for the recessed region 71 to be barely or not recessed at all in the product state, and for the post-treatment tape 70 to simply be pressed in by pressure.

[0082] In order to form the recessed region 71, if a portion not having the absorbent body 56, such as a slit 72, is formed in the absorbent body 56 as shown in Figures 4 and 5, there is a risk of the absorption performance being reduced in a relatively important portion. Therefore, it is preferable that the recessed region 71 is a region having a recess 78 on the bottom surface of the absorbent body 56. The method of forming the recess 78 on the bottom surface of the absorbent body 56 is not limited, but for example, as shown in Figures 8 and 9, it can be formed by embossing the absorbent body 56 alone or including a member located on the back side of the absorbent body 56. In addition, when the absorbent body 56 is formed of two layers, an upper layer and a lower layer, as shown in Figure 10, it is also possible to form the recess 78 in the portion where only the upper layer and no lower layer are present.

[0083] In order to further suppress an increase in the product thickness, it is also preferable that at least one of the sheet layers (for example, at least one of the sheet materials 12S, 12H in the illustrated example) located between the absorbent body 56 and the post-treatment tape 70 has a portion overlapping the recessed region 71 cut out or compressed in the thickness direction by embossing or the like so as to be thinner than the surrounding area. For the same reason, it is also preferable that the cover nonwoven fabric 13 does not extend in the front-rear direction LD to a position overlapping the recessed region 71 or the laminated portion of the post-treatment tape 70.

[0084] The thickness of absorbent body 56 when recessed area 71 is an area not having absorbent body 56, and the depth of recessed area 78 when absorbent body 56 has a recess on its bottom surface, can be determined as appropriate, and is preferably equal to or greater than the maximum thickness of post-treatment tape 70, and is preferably approximately 1.5 to 3.0 mm.

[0085] The dimensions of the recessed area 71 can be appropriately determined to be the same as or wider than the laminated portion of the post-treatment tape 70. As an example, the length of the recessed area in the front-rear direction LD can be 1.2 to 1.5 times the length of the laminated portion of the post-treatment tape 70 in the front-rear direction, and the length of the recessed area in the width direction WD can be 1.5 to 3.0 times the length of the laminated portion of the post-treatment tape 70. In addition, in order to maintain the absorption performance, it is preferable that the recessed area 71 is located to a certain extent (for example, 30 mm or more) away from the side edge of the absorbent body 56 rather than being located at the side end portion of the absorbent body 56. It may be or may not be away from the rear edge of the absorbent body 56. If it is away, it will be able to absorb excreted liquid even if it flows behind the recessed area 71, and if it is not away, the post-treatment tape 70 will be attached at a position close to the waist part W. In addition, when the recessed area 71 is an area that does not have an absorbent body 56, the dimensions of the recessed area 71 are equal to the dimensions of the slit 72 that does not have an absorbent body 56, and when the recessed area 71 is an area that has a recess 78 on the bottom surface of the absorbent body 56, the dimensions of the recessed area 71 are equal to the dimensions of the recess 78 of the absorbent body 56.

[0086] When the outer casing 12 has a laminated structure of multiple sheet materials 12S, 12H, as shown in Figures 13 to 17, it is also preferable to interpose the post-processing tape 70 between adjacent sheet layers of the outer casing, and to have perforations 76 (which may be pre-cut instead of perforations 76) in the sheet layer overlapping the outside of the post-processing tape 70 in the outer casing for forming a slit for pulling the post-processing tape 70 to the outside or an opening for exposing it to the outside.

[0087] If the post-treatment tape 70 is present inside the exterior body 12, the post-treatment tape 70 is not exposed, so not only does it look good, but it is also safe, as there is no risk of the post-treatment tape 70 getting caught on clothing, swimsuits, play equipment, etc. In addition, since the exterior body 12 holds the post-treatment tape 70 in the slit 72 or the recess 78 of the recessed area 71, the product is not bulky when stored and can be packed efficiently. Furthermore, the second part D2 does not necessarily need to be joined to the adjacent first part D1 and third part D3. Therefore, at least one of the joining means of the first part D1 and the second part D2 and the joining means of the second part D2 and the third part D3 can be omitted, in which case the thickness caused by folding the post-treatment tape 70 is suppressed. The adhesive 75 of the third part D3 or a hook material instead thereof needs to be provided to roll up and fix the absorbent article after use, but does not need to be joined to the second part D2.

[0088] When removing the post-processing tape 70 built into the exterior body 12, the perforation 76 can be torn, and the tab 77 located at the tip of the third portion D3 can be pinched to stretch the folded post-processing tape 70. As shown in Fig. 13, when there is a perforation 76 extending in the width direction WD parallel to the portion where the tab 77 is located, the post-processing tape 70 can be pulled out by inserting a fingertip into the torn perforation 76 and pinching the tab 77. As shown in Fig. 14, when there are perforations 76 surrounding the portion where the post-processing tape 70 is located on three sides, the entire post-processing tape 70 can be exposed, and the tab 77 can be pinched to unfold the post-processing tape 70. As in the latter case, the post-processing tape 70 has perforations 76 extending from an end of the post-processing tape 70 along the width direction WD to the front-rear direction LD of the post-processing tape 70, and the entire post-processing tape 70 is exposed when all the perforations 76 are torn, which is preferable because it makes it easier to remove the post-processing tape 70. There are no limitations on the length or position of the perforations 76, but it is preferable that the perforations 76 have a position and length that makes it easy to grip the tab 77.

[0089] The perforations 76 may be provided around the recessed area 71 as in the illustrated example, or may be provided between the periphery of the recessed area 71 and the periphery of the post-treatment tape 70 .

[0090] Furthermore, when the attachment portion of the post-treatment tape 70 in the outer casing 12 has a laminated structure of three or more layers, the post-treatment tape 70 may be attached between any sheet layers, but if it is attached closer to the absorbent body 56, the number of sheet layers pressing the post-treatment tape 70 toward the absorbent body 56 increases, making it easier to reduce the thickness of the product.

[0091] <Explanation of terms used in the specification> As used herein, the following terms have the following meanings unless otherwise specified in the specification.

[0092] The "front-rear direction" refers to the direction indicated by the symbol LD in the drawing (longitudinal direction), and the "width direction" refers to the direction indicated by the symbol WD in the drawing (left-right direction), with the front-rear direction and the width direction being perpendicular to each other.

[0093] "Front side" means the side closest to the wearer's skin when worn, and "back side" means the side away from the wearer's skin when worn.

[0094] "Front surface" means the surface of a component that is closest to the wearer's skin when worn, and "back surface" means the surface that is away from the wearer's skin when worn.

[0095] "Elongation rate" refers to the value when the natural length is 100%. For example, an elongation rate of 200% is equivalent to an elongation ratio of 2 times.

[0096] "Gel strength" is measured as follows: 1.0g of superabsorbent polymer is added to 49.0g of artificial urine (a mixture of urea: 2wt%, sodium chloride: 0.8wt%, calcium chloride dihydrate: 0.03wt%, magnesium sulfate heptahydrate: 0.08wt%, and ion-exchanged water: 97.09wt%) and stirred with a stirrer. The resulting gel is left in a thermo-hygrostat at 40℃ x 60%RH for 3 hours, then returned to room temperature, and the gel strength is measured with a card meter (I.techno Engineering: Curdmeter-MAX ME-500).

[0097] - "Basis weight" is measured as follows. After pre-drying the sample or test piece, leave it in a test room or device under standard conditions (test location: temperature 23±1°C, relative humidity 50±2%) until it reaches a constant weight. Pre-drying refers to bringing the sample or test piece to a constant weight in an environment at a temperature of 100°C. Note that pre-drying is not necessary for fibers with an official moisture regain of 0.0%. From the test piece that has reached a constant weight, a sample template (100mm x 100mm) is used to cut out a sample measuring 100mm x 100mm. The weight of the sample is measured and multiplied by 100 to calculate the weight per square meter, which is the basis weight.

[0098] The "thickness" of the product is measured using a thickness gauge from Ozaki Manufacturing Co., Ltd. (Peacock, dial thickness gauge, model H (measurement range 0-10mm, measurement area 10mm diameter circular terminal, measurement force approximately 1.7N, pressure approximately 21.7KPa)) with the sample and thickness gauge held horizontally.

[0099] The "thickness" of nonwoven fabric sheets was measured using an automatic thickness measuring device (KES-G5 handy compression measurement program) with a load of 0.098N / cm 2 , and pressure area: 2cm 2 The measurement is performed automatically under the following conditions.

[0100] The water absorption is measured according to JIS K7223-1996 "Test method for water absorption of superabsorbent resins".

[0101] The water absorption rate is the "time to the end point" when 2g of superabsorbent polymer and 50g of physiological saline are used and the JIS K7224-1996 "Test method for water absorption rate of superabsorbent polymers" is performed.

[0102] "Unfolded state" means a flat, unfolded state without contraction (including any contraction, such as contraction due to elastic members) or sagging.

[0103] *Unless otherwise specified, the dimensions of each part refer to the dimensions in the unfolded state, not in the natural length state. [Industrial Applicability]

[0104] The present invention is not limited to the pants-type disposable swimsuits described above, but can be used for pants-type disposable wearing articles in general, such as pants-type disposable diapers and pants-type sanitary napkins. [Explanation of symbols]

[0105] 11: liquid impermeable sheet, 12A: side seal portion, 12B: rear outer body, 12F: front outer body, 13: cover nonwoven fabric, 16: cover elastic member, 17: waist elastic member, 18: unnecessary elastic member, 30: top sheet, 40: intermediate sheet, 50: absorbent element, 56: absorbent body, 58: packaging sheet, 60: rising gathers, 60A: tip side portion, 60B: base side portion, 62: gathered nonwoven fabric, 67: fallen portion, 68: free portion, 70...post-treatment tape, 71...recessed area, 72...slit, 76...perforation, 78...recess, 200...inner body, 201, 202...inner and outer joints, A1...non-stretchable area, A2...stretchable area, B...back body, C...buttocks cover portion, D1...first portion, D2...second portion, D3...third portion, F...front body, L...middle region, LD...front to back direction, LO...leg opening, T...torso region, U...lower waist portion, W...waist portion, WD...width direction, WO...waist opening.

Claims

1. The garment has a tubular waist region that is continuous in a waist direction, an intermediate region that extends from a lower end of a front portion of the waist region through a crotch area to a lower end of a rear portion of the waist region, a waist opening, and a pair of left and right leg openings, an absorbent body extending from a front portion of the waist region through the crotch region to a rear portion of the waist region; A pants-type disposable absorbent article having a belt-shaped post-treatment tape attached to a rear portion of the waist region in a folded state by being folded back multiple times in the front-rear direction, the post-treatment tape has a laminated portion at least a part of which overlaps with the absorbent body, the laminated portion is located between positions where the laminated portion overlaps with both side edges of the absorbent body and is located forward of a position where the laminated portion overlaps with a rear end of the absorbent body; A recessed area has a recess formed by embossing on the bottom surface of the absorbent body in a portion overlapping the entire laminated portion or in a wider area, The thickness of the product excluding the post-treatment tape in the recessed area and the thickness of the product in the area having the absorbent body around the recessed area were measured using a dial thickness gauge model H manufactured by Ozaki Seisakusho Co., Ltd. with the product and the thickness gauge held horizontally. the thickness of the product excluding the post-treatment tape in the recessed area is thinner than the thickness of the product in the area having the absorbent body around the recessed area; A pants-type disposable absorbent article.

2. The depth of the recess is equal to or greater than the maximum thickness of the post-treatment tape.

2. The pants-type disposable absorbent article according to claim 1.

3. The pants-type disposable absorbent article is a disposable swimsuit having an outer surface made of a nonwoven fabric, In the post-treatment tape, in the folded state, adjacent layers are bonded together via the hook material of the mechanical fastener, and in a state where the post-treatment tape is unfolded from the folded state, the hook material of the mechanical fastener remains on at least one of the front and rear surfaces, The hook material of the mechanical fastener is provided at least on the laminated portion, With the pant-type disposable wearing article in a rolled-up state, the post-treatment tape is unfolded from the folded state and wrapped around the pant-type disposable wearing article in the rolled-up state, and the hook member of the mechanical fastener remaining on at least one of the front and rear surfaces of the post-treatment tape is attached to an outer surface of the pant-type disposable wearing article in the rolled-up state.

3. A pants-type disposable absorbent article according to claim 1 or 2.

4. An exterior body that forms at least the waist area; an inner body attached to the outer body so as to extend from a front portion of the waist region through the crotch area to a rear portion of the waist region; The absorbent body is incorporated in the inner body, The exterior body is formed by laminating a plurality of sheet layers, the post-treatment tape is interposed between adjacent sheet layers of the exterior body, a sheet layer overlapping the outside of the post-treatment tape in the exterior body has a slit for pulling out the post-treatment tape to the outside, an opening for exposing the post-treatment tape to the outside, or a perforation for forming either of these; The perforations are provided around the recessed area. The pants-type disposable absorbent article according to any one of claims 1 to 3.

5. The laminated portion is a portion located at the center in the width direction of the absorbent body and away from the rear end of the absorbent body toward the front side. The pants-type disposable absorbent article according to any one of claims 1 to 4.

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