Pants-type disposable wear

Abstract

To provide a back side barrier that automatically rises and fits.SOLUTION: A back side barrier 70 includes a first part 71 fixed to the back B over the whole in a width direction WD, a second part 72 extending forward from the front edge of the first part 71, and a third part 73 folded back rearward from the front edge of the second part 72 and extending rearward. A part positioned in the middle of the width direction WD of the back side barrier 70 is a high rising part 81 where the second part 72 and the third part 73 rise from the surface of the back B, A part positioned on the two lateral sides of the high rising part 81 of the back side barrier 70 is a low rising part 82 where the second part 72 does not rise, and the third part 73 rises. A slender barrier elastic member 74 is attached to at least the rear end part of the third part 73 over the high rising part 81 and the low rising part 82.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a pants-type disposable wearing article having a back leakage prevention function. [Background technology]

[0002] Pant-type disposable wearing articles such as pants-type disposable diapers and pants-type sanitary napkins have widthwise elasticity in the waist area, which makes it difficult for gaps to form between the wearer's back and the diaper, making it less likely for urine and other excrement to leak from the back (so-called back leakage).

[0003] For example, a typical pants-type disposable diaper includes an outer shell that forms at least the waist-circumference portions of the front and rear panels, and an inner shell that includes an absorber and is attached to the outer shell so as to extend from the front panel to the rear panel. Side seals are formed by joining both side edges of the outer shell of the front panel to both side edges of the outer shell of the rear panel, thereby forming a waist opening and a pair of left and right leg openings. The outer shell is provided with elastic members in the waist-circumference region defined by the side seals in the front-to-rear direction (the front-to-rear direction range from the waist opening to the upper ends of the leg openings), thereby imparting widthwise stretchability. As the elastic members, those that use elongated elastic members such as rubber threads, as well as those that use elastic films, are also known (see, for example, Patent Documents 1 and 2).

[0004] Furthermore, in order to further improve the back leakage prevention, it has been proposed to provide a back barrier in pants-type disposable wearing articles (see, for example, Patent Document 1).

[0005] However, in conventional pants-type disposable wearing articles equipped with a back barrier, the back barrier has sometimes been used in a collapsed state. That is, the back barrier is attached in a flat, folded state during manufacturing and is not only pressurized in the thickness direction, but also remains pressed in the thickness direction until use. Therefore, even when the product is used, the raised portion may remain in a collapsed state and weakly attached to the opposing surface. Therefore, if the product is used without noticing this state, the leak prevention function may be insufficient, and it is therefore desirable to raise the back barrier once before use. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-252303 [Patent Document 2] Japanese Patent Application Laid-Open No. 2013-75106 Summary of the Invention [Problem to be solved by the invention]

[0007] SUMMARY OF THE INVENTION It is therefore a primary object of the present invention to provide a pants-type disposable wearing article in which the back barrier automatically rises to fit snugly. [Means for solving the problem]

[0008] The following pants-type disposable wearing article has solved the above problems. <First aspect> An integrated outer body extending from the front body to the back body, or an outer body provided separately on the front body and the back body, An inner body attached to the middle of the outer body in the width direction so as to extend from the front body through the crotch area to the back body; A pair of side seals formed by joining both side portions of the exterior body in the front body and both side portions of the exterior body in the back body, respectively; a waist opening formed by the front edge of the front body and the rear edge of the back body; leg openings provided on both sides of the interior body, a back barrier having an inwardly rising portion extending widthwise from one of the side seals to the other side seal on the waist opening side of the crotch portion of the back body; The back-side barrier has, across its entire width, a first portion fixed to the back body, a second portion extending forward from a front edge of the first portion, and a third portion folded back from the front edge of the second portion and extending rearward, a portion of the back barrier located at the middle in the width direction is a high rise portion in which the back surface of the second portion and the front surface of the back body are not joined over the entirety, and the front surface of the second portion and the back surface of the third portion are not joined over the entirety; The portions of the back barrier located on both sides of the high rise portion are low rise portions in which at least the front end of the back surface of the second portion and the front surface of the back body are joined over the entirety, and the front surface of the second portion and the back surface of the third portion are not joined over the entirety, an elongated barrier elastic member is attached to at least a rear end of the third portion along the width direction so as to extend from one of the low rise portions through the high rise portion to the other low rise portion; a portion of the third portion having the barrier elastic member elastically contracts in the width direction together with the barrier elastic member in a natural length state, and is elastically extensible in the width direction; A pants-type disposable wearing article characterized by:

[0009] (Action and effect) In this pants-type disposable wearable article, the third portion of the back barrier rises to conform to the skin and adheres closely to the skin when worn, thereby reducing gaps between the back body and the body surface and preventing leakage. In particular, the back barrier has a high-rise portion in the middle of the width direction, where gaps are likely to occur, in which the second and third portions rise (i.e., the riseable height is relatively high), while on both sides of the high-rise portion, the second portion does not rise and only the third portion rises (i.e., the riseable height is low). Because the high-rise portion has a high riseable height, it provides excellent leak prevention but also allows for relatively free movement. On the other hand, the low-rise portion has poorer leak prevention properties but is more likely to maintain its folded state. Therefore, if the entire width of the back barrier were a high-rise portion, the third portion would partially collapse forward when putting on or while wearing the article, potentially resulting in an undesirable condition such as a poor fit. In contrast to this, when low rising portions are continuous on both sides of a high rising portion as in the present article, the folded-back state of the high rising portion is maintained by the action of maintaining the folded-back state of the low rising portion.

[0010] <Second aspect> The dimension of the second portion in the front-rear direction is 10 to 30 mm, The second portion is not provided with an elastic member, The dimension of the third portion in the front-rear direction is 0.5 to 1.5 times the dimension of the second portion in the front-rear direction, The third portion includes a plurality of the barrier elastic members provided at intervals in the front-rear direction, No elastic member is provided within 5 mm of the boundary between the third portion and the second portion, The third portion has a maximum elongation rate of 200 to 300% in the width direction. A pants-type disposable wearing article according to a first embodiment.

[0011] (Action and effect) The dimensions of each part of the back barrier can be determined as appropriate, but it is preferable to set them within the range of this embodiment because the highly raised part of the third part rises to fit closer to the skin and makes easier surface contact.

[0012] <Third aspect> the inner body has an absorber extending from a position forward of the crotch area to the first portion, The end portion of the low rise portion on the center side in the width direction is located on both end portions in the width direction of the absorbent body. A pants-type disposable wearing article according to the first or second aspect.

[0013] (Action and effect) If the width of the high rise portion is unnecessarily wide or the low rise portion, which has the shape-maintaining effect of the high rise portion, is easily deformed, there is a high risk that the high rise portion will become undesirable due to deformation that occurs during wear.In contrast, in this embodiment, the low rise portion extends to the portion having the relatively rigid absorbent body and becomes the high rise portion from there, so the shape-maintaining effect of the low rise portion is enhanced, and as a result, the shape-maintaining effect of the high rise portion is also enhanced.

[0014] <Fourth aspect> a longitudinally elongated elastic member is attached adjacent to at least both the front and rear of the third portion in a longitudinal range of the exterior body including the side seal, and the elastic member is attached along the width direction; a region of the exterior body having the elastic member elastically contracts in the width direction together with the elastic member of the exterior body in a natural length state and is elastically extensible in the width direction; The barrier elastic member and the elastic member of the exterior body are elastic members having the same thickness and elastic modulus and attached at the same elongation rate. The pants-type disposable wearing article according to any one of the first to third aspects.

[0015] (Action and effect) Pants-type disposable wearing articles generally have elastic members that run along the width of the waist region of the outer body. In this case, if the tightness provided by the barrier elastic member differs from the tightness provided by the elastic members of the outer body located in the vicinity of the barrier elastic member, this may cause discomfort. Therefore, as in the present embodiment, it is preferable to attach the elastic members of the barrier elastic member and the elastic members of the outer body located in the vicinity of the barrier elastic member in the vicinity of the barrier elastic member, which have the same thickness and elastic modulus and are attached at the same elongation rate, to reduce the likelihood of discomfort. [Effects of the Invention]

[0016] As described above, the present invention provides advantages such as the back barrier automatically rising up to fit. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 2 is a plan view showing the inner surface of the pants-type disposable diaper in an unfolded state. [Figure 2] FIG. 2 is a plan view showing the outer surface of the pants-type disposable diaper in an unfolded state. [Figure 3] 2 is a cross-sectional view taken along line 2-2 of FIG. 1. [Figure 4] 3 is a cross-sectional view of FIG. 1 taken along line 3-3. [Figure 5] 1(a) is a cross-sectional view taken along line 4-4 in FIG. 1, and FIG. 1(b) is a cross-sectional view taken along line 5-5 in FIG. [Figure 6] FIG. 1 is a perspective view of a pants-type disposable diaper. [Figure 7] FIG. 2 is a plan view showing the outer surface of the inner body in the deployed state together with the outline of the outer body. [Figure 8] 6 is a cross-sectional view taken along line 6-6 of FIG. 1. [Figure 9] FIG. 2 is a perspective view showing a main part of the inner surface of the pants-type disposable diaper. [Figure 10] FIG. 10 is a schematic diagram showing a cross section of the back barrier viewed from the crotch side toward the waist opening side. [Figure 11] 1A is a schematic diagram of a longitudinal section of a high-rise portion, and FIG. 1B is a schematic diagram of a longitudinal section of a low-rise portion. [Figure 12] 1. (a) is a cross-sectional view of another example corresponding to the cross section 4-4 in FIG. 1, and (b) is a cross-sectional view of another example corresponding to the cross section 5-5 in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] A pants-type disposable diaper will be described in detail below as an example of a pants-type disposable wearing article, with reference to the accompanying drawings. Adjacent components in the thickness direction are fixed or joined as needed, in addition to the fixed or joined portions described below, in the same manner as known diapers. The dotted patterns in the cross-sectional view indicate adhesives such as hot-melt adhesives used as the fixing or joining means. Hot-melt adhesives can be applied by known methods, such as slot coating, continuous or dotted bead coating, spiral, Z-shaped, or wavy spray coating, or pattern coating (transfer of hot-melt adhesive using a relief printing method). Alternatively or in addition to this, hot-melt adhesive can be applied to the outer surface of the elastic member to fix the elastic member to an adjacent member. Hot-melt adhesives include, for example, EVA-based, adhesive rubber-based (elastomer-based), polyolefin-based, and polyester / polyamide-based adhesives, but no particular limitation is imposed on them. Material welding methods, such as heat sealing and ultrasonic sealing, can also be used to fix or join the components. In areas 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 using a hot melt adhesive, intermittent pattern application such as a spiral, Z-shape, or wavy pattern can be suitably used. When applying to an area greater than the application width of a single nozzle, intermittent pattern application such as a spiral, Z-shape, or wavy pattern can be performed with or without gaps in the width direction. Material welding methods such as heat sealing and ultrasonic sealing can also be used to join the components.

[0019] Furthermore, as the nonwoven fabric in the following description, known nonwoven fabrics can be used as appropriate depending on the location and purpose. The constituent fibers of the nonwoven fabric can be selected without particular limitation, for example, synthetic fibers such as polyolefins (e.g., polyethylene or polypropylene), polyesters, and polyamides (including single-component fibers as well as core-sheath and other composite fibers), regenerated fibers (e.g., rayon or cupra), and natural fibers (e.g., cotton), and mixtures of these can also be used. To increase the flexibility of the nonwoven fabric, it is preferable to use crimped fibers as the constituent fibers. Furthermore, the constituent fibers of the nonwoven fabric can be hydrophilic fibers (including fibers made hydrophilic by a hydrophilizing agent), hydrophobic fibers, or water-repellent fibers (including fibers made water-repellent by a water-repellent agent). Furthermore, nonwoven fabrics are generally classified 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), etc. depending on the fiber length, sheet formation method, fiber bonding method, and laminated structure, and any of these nonwoven fabrics can be used.

[0020] 1 to 6 show a pants-type disposable diaper. This pants-type disposable diaper has an annular waist region T formed by joining both sides of a front body F and both sides of a back body B with side seals 12A; a middle region L extending from the waist region T of the front body F through the crotch region to the waist region T of the back body B; a waist opening WO provided on the side of the waist region T opposite the middle region L; and leg openings LO provided on both sides of the middle region L in the width direction WD. In other words, the waist region T is defined as the region between the edge of the waist opening WO and an imaginary line passing through the upper ends of the leg openings LO and extending in the width direction, and the middle region L is defined as the range in the front-to-back direction LD between the lower end of the side seals 12A of the front body F and the lower end of the side seals 12A of the back body B. In the unfolded state shown in Figs. 1 and 2, both side edges of the middle region L are constricted in a U-shape or curved shape to fit around the legs of the wearer, and the overall shape of the diaper is generally hourglass-shaped.

[0021] This pants-type disposable diaper comprises two main assemblies: outer bodies 12F, 12B that form at least the waist region T; and an inner body 200 attached to the outer bodies 12F, 12B so as to extend from the front body F to the back body B. An opening formed by the front and rear ends of the outer bodies 12F, 12B forms a waist opening WO through which the wearer's torso is inserted. The inner body 200 has leg openings LO on both widthwise sides, enclosed by the lower edges of the outer bodies 12F, 12B and the side edges of the inner body 200. The inner body 200 absorbs and retains excrement such as urine, and the outer bodies 12F, 12B support the inner body 200 against the wearer's body. Furthermore, the symbol Y denotes the overall length of the diaper in its unfolded state (the length in the front-to-rear direction LD from the edge We of the waist opening WO of the front body F to the edge We of the waist opening WO of the back body B), and the symbol X denotes the overall width of the diaper in its unfolded state.

[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 is an assembly that performs an absorbing function, and includes a top sheet 30 that faces the body, a liquid-impermeable sheet 11, and an absorbent element 50 interposed between them. Reference numeral 40 denotes an intermediate sheet (second sheet) that is 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 come into contact with the wearer's legs in order to prevent excrement from leaking out the sides of the inner body 200.

[0023] (Top sheet) The top sheet 30 is liquid-permeable, and examples thereof include a perforated or non-perforated nonwoven fabric and a perforated plastic sheet. The top sheet 30 may consist of a single sheet, or a laminated sheet obtained by bonding two or more sheets together. Similarly, the top sheet 30 may consist of a single sheet, or two or more sheets in the planar direction.

[0024] The side edges of the top sheet 30 may be folded back at the side edges of the absorbent element 50, or may not be folded back and may extend out to the sides beyond the side edges of the absorbent element 50.

[0025] The top sheet 30 is preferably fixed to an adjacent backside member by a material welding joining means such as heat sealing or ultrasonic sealing, or by a hot melt adhesive, in order to prevent misalignment relative to the backside member, etc. In the illustrated example, the top sheet 30 is fixed to the 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 backside of the top sheet 30.

[0026] (middle seat) An intermediate sheet (also called a "second sheet") 40, which has a faster liquid permeability rate than the top sheet 30, can be provided to allow liquid that has permeated the top sheet 30 to quickly transfer to the absorbent body 56 and to prevent the absorbed liquid from "backflowing back" from the absorbent body 56. The intermediate sheet 40 can also be omitted.

[0027] Examples of the intermediate sheet 40 include the same material as the top sheet 30, spunlace nonwoven fabric, spunbond nonwoven fabric, SMS nonwoven fabric, pulp nonwoven fabric, a mixed sheet of pulp and rayon, point-bond nonwoven fabric, and crepe paper. Air-through nonwoven fabric is particularly preferred because of its bulkiness. For the air-through nonwoven fabric, it is preferable 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 2is preferable, and 17 to 50 g / m 2 The thickness of the raw material fibers 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 material fibers.

[0028] 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 entire length of the diaper, the same as the length of the absorbent element 50, or may be within a short length range centered on the liquid-receiving region.

[0029] In order to prevent the intermediate sheet 40 from shifting relative to the backside member, it is desirable to fix the intermediate sheet 40 to the backside adjacent member by a joining means that uses material welding such as heat sealing or ultrasonic sealing, or by a hot melt adhesive. 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 backside of the intermediate sheet 40.

[0030] (Liquid-impermeable sheet) The material of the liquid-impermeable sheet 11 is not particularly limited, but examples thereof include a plastic film made of a polyolefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric in which a plastic film is provided on the surface of a nonwoven fabric, and a laminated sheet in which a nonwoven fabric or the like is overlaid and bonded to a plastic film. A liquid-impermeable and moisture-permeable material, which is preferred from the viewpoint of preventing stuffiness, is preferably used for the liquid-impermeable sheet 11. A widely used moisture-permeable plastic film is a microporous plastic film obtained by kneading an inorganic filler into a polyolefin resin such as polyethylene or polypropylene, forming the sheet, and then stretching the sheet in a uniaxial or biaxial direction. In addition, nonwoven fabrics using microdenier fibers, nonwoven fabrics whose leak-proofing properties have been enhanced by reducing the voids in the fibers through the application of heat or pressure, and sheets that have been made liquid-impermeable without using a plastic film by coating with a highly absorbent resin or a hydrophobic resin or a water-repellent agent can also be used as the liquid-impermeable sheet 11, but it is preferable to use a resin film in order to obtain sufficient adhesive strength when bonding with the cover nonwoven fabric 13 described below via a hot melt adhesive.

[0031] The liquid-impermeable sheet 11 is made to have a width that fits behind the absorbent element 50 as shown in the figure, and in order to improve leakproofness, it can also be made to wrap around both sides of the absorbent element 50 and extend to both sides of the absorbent element 50 on the side of the top sheet 30. The appropriate width of this extension is about 5 to 20 mm on each side.

[0032] (Get up and gather) The rising gathers 60 extend along both side portions of the inner body 200 over the entire length in the front-to-rear direction LD, and are provided to come into contact with the wearer's legs to prevent side leakage. If necessary, the rising gathers 60 can be omitted.

[0033] 1, 3, and 4 stand up from the side of the inner body 200 to the front side. These stand up gathers 60 have a base side portion 60B that stands up obliquely toward the widthwise center, and a tip side portion 60A that stands up obliquely from the middle toward the widthwise outer side, but are not limited to this and can be modified as appropriate, such as a form in which the entire gathers stand up toward the widthwise center.

[0034] Explaining in more detail, the rising gathers 60 in the illustrated example are formed by folding back in two a band-shaped gathered nonwoven fabric 62 having a length equal to the longitudinal length of the inner body 200 in the width direction WD at its tip, and by 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 of the rising gathers 60 located opposite the tip (the end opposite the folded-back portion of the sheet in the width direction WD) forms a root portion 65 fixed to the side portion of the inner body 200 on the back side of the liquid-impermeable sheet 11, and the portion other than this root portion 65 forms a main body portion 66 (the portion on the folded-back portion side) extending from the root portion 65. The main body portion 66 also has a root portion 60B extending toward the center in the width direction, and a tip portion 60A that is folded back at the tip of the root portion 60B and extends outward in the width direction. This configuration is a surface-contact type of rising gathers 60, but it is also possible to use a line-contact type of rising gathers 60 that are not folded back outward in the width direction. The front-to-back end portions of the main body portion 66 are laid-down portions 67 that are fixed in a laid-down state to the side surfaces of the topsheet 30, while the front-to-back intermediate portion between them is an unfixed free portion 68, and gathered elastic members 63 that extend along the front-to-back direction LD are fixed in a stretched state to at least the tip portions of these free portions 68.

[0035] In the rising gathers 60 configured as described above, the contractile force of the gathered elastic members 63 acts to bring the front-to-rear end portions closer together, but while the front-to-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, and therefore only the free portion 68 stands up so as to abut against the body side as shown by the arrow in Fig. 3. In particular, when the base portion 65 is located on the back side of the inner body 200, the free portion 68 stands up so as to open outward in the width direction in the crotch region and its vicinity, and the rising gathers 60 come into surface contact with the leg circumference, improving the fit.

[0036] In a bent form, such as the illustrated example of the rising gathers 60, in which the main body portion 66 is composed of a base portion 60B extending toward the center in the width direction and a tip portion 60A folded back at the tip of the base portion 60B and extending outward in the width direction, the tip portion 60A and the base portion 60B are joined in a folded state at the fallen portion 67, and the base portion 60B is joined in a folded state to the topsheet 30. To join the opposing surfaces at the fallen portion 67, at least one of various application methods of hot melt adhesive and material welding means such as heat sealing and ultrasonic sealing can be used. In this case, the joining of the base portion 60B and the topsheet 30 and the joining of the tip portion 60A and the base portion 60B may be performed by the same means or by different means. For example, one preferred embodiment is to join the root side portion 60B and the top sheet 30 with a hot melt adhesive, and to join the tip side portion 60A and the root side portion 60B by material welding.

[0037] Gathered nonwoven fabrics 62 include spunbond nonwoven fabrics (SS, SSS, etc.) and SMS nonwoven fabrics (SMS, SSMMS, etc.), Meltblown nonwoven fabric A nonwoven fabric that is soft, uniform, and has excellent hiding power, such as the above, can be preferably treated with a water-repellent agent such as silicone, if necessary, and has a fiber weight of 10 to 30 g / m. 2It is preferable that the thickness is about 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 be formed of the gathered nonwoven fabric 62, as in the example shown.

[0038] The number of gathered elastic members 63 provided in the free portion of the rising gathers 60 is preferably 2 to 6, more preferably 3 to 5. The appropriate spacing is 3 to 10 mm. With this configuration, the gathered elastic members 63 can easily contact the skin over the entire area where they are arranged. The gathered elastic members 63 may be arranged not only on the tip side but also on the base side.

[0039] In the free portion 68 of the rising gathers 60, at least one of various application methods of hot melt adhesive and material welding, such as heat sealing or ultrasonic sealing, can be used to bond the inner and outer layers of the gathered nonwoven fabric 62 together and to secure the gathered elastic member 63 sandwiched therebetween. Bonding the entire surfaces of the inner and outer layers of the gathered nonwoven fabric 62 reduces flexibility, so it is preferable to leave the areas other than the adhesive joints of the gathered elastic member 63 unbonded or to only weakly bond them. In the illustrated example, hot melt adhesive is applied only to the outer peripheral surface of the gathered elastic member 63 using an application means such as a comb gun or a SureWrap nozzle, and the gathered elastic member 63 is sandwiched between the inner and outer layers of the gathered nonwoven fabric 62. This results in a structure in which the gathered elastic member 63 is secured to the inner and outer layers of the gathered nonwoven fabric 62 and the inner and outer layers of the gathered nonwoven fabric 62 are secured together solely by the hot melt adhesive applied to the outer peripheral surface of the gathered elastic member 63.

[0040] Similarly, the waterproof film 64 incorporated into 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 various application methods of hot melt adhesive and material welding such as heat sealing or ultrasonic sealing.

[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 in some cases.

[0042] (absorber) The absorbent body 56 can be formed from a fiber assembly. This fiber assembly can be made by stacking staple fibers such as cotton-like pulp or synthetic fibers, or it can be made from a filament assembly obtained by opening a tow (fiber bundle) of synthetic fibers such as cellulose acetate as needed. When cotton-like pulp or staple fibers are stacked, the fiber weight can be, for example, 100 to 300 g / m 2 In the case of a filament aggregate, for example, 30 to 120 g / m 2 The fineness of 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 crimp degree of the crimped fibers can be, for example, 5 to 75, preferably 10 to 50, and more preferably 15 to 50, particles per 2.54 cm. Uniformly crimped fibers can also be used. It is preferable that highly absorbent polymer particles are dispersed and retained in the absorbent body 56.

[0043] The absorbent body 56 may be rectangular in shape, but as shown in Figure 7, etc., it is preferable to have an hourglass shape with a narrower constricted portion 56N in the middle in the front-to-back direction than the front and back sides, 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 to the front, rear, left, and right of the urination opening position, but it is preferable that it extends to or near the peripheral edge of the inner body 200 in the front-to-rear direction LD and the width direction WD. The symbol 56X indicates the overall width of the absorber 56.

[0045] (Superabsorbent polymer particles) The absorbent body 56 may contain superabsorbent polymer particles in part or in its entirety. The term "superabsorbent polymer particles" includes not only "particles" but also "powder." The superabsorbent polymer particles used in this type of disposable diaper can be used as is. For example, it is desirable that the percentage of particles remaining on a 500 μm standard sieve (JIS Z8801-1:2006) after sieving (shaking for 5 minutes) is 30% by weight or less, and it is also desirable that the percentage of particles remaining on a 180 μm standard sieve (JIS Z8801-1:2006) after sieving (shaking for 5 minutes) is 60% by weight or more.

[0046] The material of the superabsorbent polymer particles is not particularly limited, but a water absorption capacity of 40 g / g or more is preferred. Examples of superabsorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based materials, such as 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 the commonly used powder-like form, but other shapes can also be used.

[0047] The basis weight of the highly absorbent polymer particles can be determined appropriately depending on the absorption amount required for the application of the absorbent body 56. Therefore, although it cannot be generalized, it is generally in the range of 50 to 350 g / m 2 It can be said that:

[0048] (packaging sheet) When using the packaging sheet 58, tissue paper, especially crepe paper, nonwoven fabric, polylaminated nonwoven fabric, perforated sheet, etc. can be used as the material. 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 polypropylene, polyethylene / polypropylene composite material, etc. can be used as the material. The basis weight is 5 to 40 g / m 2 , especially 10 to 30 g / m 2 It is preferable that:

[0049] The packaging form of the packaging sheet 58 can be determined as appropriate, but from the standpoint of ease of manufacturing 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 body 56 in a cylindrical shape, with the front and rear edges extending beyond the front and rear of the absorbent body 56, and to join the overlapping parts of the wrapped and protruding front and rear edges by a joining means such as a hot melt adhesive or material welding.

[0050] (Nonwoven cover) In a pants-type disposable diaper with a two-part exterior, the inner body 200 is exposed between the front exterior body 12F and the rear exterior body 12B, so it is preferable to provide a cover nonwoven fabric 13 that covers the back surface of the inner body 200 from between the front exterior body 12F and the inner body 200 to between the rear exterior 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.

[0051] The cover nonwoven fabric 13 is not particularly limited by the type of fiber or the method of bonding (entangling) the fibers, and can be appropriately selected from, for example, the same materials as the first and second sheets of the exterior bodies 12F and 12B described below. As an example of the cover nonwoven fabric 13, an air-through nonwoven fabric can be suitably used, and in this case, the basis weight is 20 to 40 g / m 2 The thickness is preferably 0.3 to 1.0 mm. The cover nonwoven fabric 13 may be a non-porous nonwoven fabric that does not have holes that penetrate from the front to the back, or a porous nonwoven fabric that has a large number of holes that penetrate from the front to the back at intervals.

[0052] 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 interior body 200 from the front end to the rear end as shown in Figures 2 and 5, or may extend in the front-rear direction LD from the front-rear direction central position of the area where the front exterior body 12F and the interior body 200 overlap to the front-rear direction central position of the area where the rear exterior body 12B and the interior body 200 overlap as shown in Figure 7. In the example shown in Figure 7, 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 determined as appropriate, but typically can be approximately 20 to 40 mm each.

[0053] The widthwise range of the cover nonwoven fabric 13 is set to a range that can hide the exposed back surface of the liquid-impermeable sheet 11. For this reason, in the illustrated example, the liquid-impermeable sheet 11 is exposed between the base ends of the left and right rising gathers 60, and therefore the cover nonwoven fabric 13 is provided so as to cover the widthwise range from the back side of the base end of at least one of the rising gathers 60 to the back side of the base end of the other rising gather 60. This allows the liquid-impermeable sheet 11 to be concealed by the cover nonwoven fabric 13 and the gathered nonwoven fabric 62 of the rising gathers 60. Furthermore, even if the widthwise end 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 widthwise end ends of the cover nonwoven fabric 13, it is still possible to conceal the liquid-impermeable sheet 11 by the cover nonwoven fabric 13 and the gathered nonwoven fabric 62. 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.

[0054] The inner and outer surfaces of the cover nonwoven fabric 13 can be bonded to their opposing surfaces via a hot melt adhesive. The fixed area of ​​the cover nonwoven fabric 13 can be the entire front-to-back direction and the entire width direction of the cover nonwoven fabric 13, or a portion can be left unfixed. For example, if both widthwise ends 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 absorber 56 shrink somewhat, which has the advantage of making the cover nonwoven fabric 13 less susceptible to wrinkles or folds. In this case, the width of the unfixed portions at both widthwise ends of the cover nonwoven fabric 13 can be determined as appropriate, but can be, for example, 3 to 10 mm, preferably 5 to 8 mm.

[0055] (Interior body fixing part) The inner body 200 can be fixed to the outer bodies 12F, 12B by a joining means that uses 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 surfaces of the outer bodies 12F, 12B via a hot melt adhesive that is 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 base portions 65 of the rising gathers 60. The inner body fixing portions 201, 202 that fix the inner body 200 to the outer bodies 12F, 12B can be provided over almost the entire overlapping area, as shown in FIG. 2, and can also be provided in areas excluding both widthwise ends of the inner body 200, for example.

[0056] (exterior body) The exterior bodies 12F, 12B in the illustrated example are composed of a rectangular front exterior body 12F that forms the waist region T of the front body F and a rectangular back exterior body 12B that forms the waist region T of the back body B, and the front exterior body 12F and the back exterior body 12B are not continuous on the crotch side but are spaced apart in the front-to-back direction LD. This separation distance 12d can be, for example, approximately 0.4 to 0.5 times the total length Y. The exterior bodies 12F, 12B may also be an integrated body that is continuous from the front body F to the back body B through the crotch area.

[0057] The portion of the outer body 12F, 12B located in the waist-surrounding region T can be divided into a waist portion W that forms the end on the waist opening WO side, and a lower waist portion U that is the portion below this. If the portion of the outer body 12F, 12B located in the waist-surrounding region T has a boundary where the stretchability in the width direction WD changes (for example, where the thickness or elongation rate of the elastic member changes), the waist portion W is the portion closer to the waist opening WO than the boundary closest to the waist opening WO. If there is no such boundary, the waist extension portion 12E that extends further toward the waist opening WO than the absorbent body 56 or inner body 200 is the waist portion W. The length of these portions in the front-to-back direction LD varies depending on the size of the product and can be determined as appropriate; as an example, the waist portion W can be 15 to 40 mm, and the lower waist portion U can be 65 to 120 mm.

[0058] In the illustrated example, the front exterior body 12F and the rear exterior body 12B have the same dimension in the front-to-rear direction LD and neither has a portion located in the middle region L, but as shown by the two-dot chain line in Fig. 7, the rear exterior body 12B has a longer dimension in the front-to-rear direction than the front exterior body 12F, and the front exterior body 12F does not have a portion located in the middle region L, but the rear exterior body 12B may have a buttocks covering portion C extending from the waist region T toward the middle region L. Although not shown, 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, or a configuration may be adopted in which a groin covering portion is provided but no buttocks covering portion is provided.

[0059] The exterior bodies 12F, 12B incorporate elastic members 15, 17 to improve fit around the wearer's waist, and form stretchable regions A2 that stretch in the width direction WD in conjunction with the stretching of the elastic members 15, 17. In these stretchable regions A2, pleats form as they contract in the width direction WD together with the elastic members 15, 17 when at their natural length. When worn, the pleats expand and the garment can be stretched to a predetermined stretch rate without pleating. The elastic members 15, 17 can be any known elongated elastic member, such as a thread or strip. The elastic members 15, 17 may be made of synthetic or natural rubber.

[0060] To explain the elastic members 15, 17 in the illustrated example in more detail, a plurality of waist elastic members 17 are attached to the waist portion W of the outer bodies 12F, 12B at intervals in the front-to-rear direction so as to be continuous over the entire width direction WD. Furthermore, one or more of the waist elastic members 17 arranged in the region adjacent to the lower waist portion U may overlap the inner body 200, or may be provided on both sides in the width direction except for the central portion in the width direction that overlaps with the inner body 200. The waist elastic members 17 should have 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 2 to 15, and especially about 4 to 10, rubber threads (approximately 170 mm long) at intervals of 2 to 12 mm, especially 3 to 7 mm, and the resulting elongation rate in the width direction WD of the waist portion W is preferably about 150 to 400%, especially 220 to 320%. The intervals between the waist elastic members 17 in the front-to-back direction LD may be constant or may vary midway in the front-to-back direction LD.

[0061] It is also preferable that a plurality of lower waist elastic members 15 made of elongated elastic members are attached to the lower waist portion U of the exterior bodies 12F, 12B at intervals in the front-to-rear direction. The lower waist elastic members 15 should have a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber, or a cross-sectional area of ​​0.05 to 1.5 mm in the case of natural rubber). 2 , especially 0.1 to 1.0 mm 2 It is preferable to provide about 5 to 30 elastic threads (approximately 150 mm) at intervals of 1 to 15 mm, especially 3 to 8 mm, and the resulting elongation rate in the width direction WD of the waist lower portion U is preferably about 200 to 350%, especially about 240 to 300%. The intervals between the waist lower elastic members 15 in the front-to-back direction LD may be constant or may vary midway in the front-to-back direction LD as in the illustrated example.

[0062] When the lower waist elastic members 15 are provided in the front-to-rear range including the absorbent body 56, as in the lower waist portion U in the illustrated example, in order to prevent contraction of the absorbent body 56 in the width direction WD in part or all of it, 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 body fastening parts 201, 202) is made into a non-elastic region A1, and both sides of that in the width direction are made into elastic regions A2. It is preferable that the entire 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.

[0063] The stretchable region A2 and non-stretchable region A1 can be achieved by, during the manufacture of the outer garments 12F, 12B, fixing the elastic member 15, and then cutting the lower-waist elastic member 15 in the region that will become the non-stretchable region A1 by applying pressure and heat, either at a single location in the middle of the width or by cutting it into multiple small locations, thereby retaining stretchability in the stretchable region A2 while eliminating stretchability in the non-stretchable region A1. In these cases, cut pieces 16 of the elastic member that do not substantially contribute to stretching will remain in the outer garments 12F, 12B in the non-stretchable region A1.

[0064] (Laminated structure of the exterior body) In the example shown in Fig. 5, the waist portion W has an outer portion 18 in which a first sheet 12S made of nonwoven fabric or the like and a second sheet 12H made of nonwoven fabric or the like are laminated, and an inner portion 19 formed by folding at least the first sheet 12S inward at the edge We of the waist opening WO, and the inner portion 19 is joined to the outer portion 18 via a hot melt adhesive HM (or by welding). In the example shown in Fig. 5, the first sheet 12S and second sheet 12H of the outer portion 18 are Waist W5, the second sheet 12H is also folded back at the edge of the waist opening WO and forms an inner portion 19 together with the first sheet 12S, and the second sheet 12H of the inner portion 19 extends only to the middle of the waist portion W in the front-to-back direction LD, and the first sheet 12S extends from the waist portion W to the lower waist portion U, covering the end of the inner body 200 on the waist opening WO side; however, the present invention is not limited to this, and for example, both the first sheet 12S and the second sheet 12H may extend to the lower waist portion U, or both the first sheet 12S and the second sheet 12H may be contained within the waist portion W, or may extend only as far as the waist opening WO side of the inner body 200 and not cover the end of the inner body 200. 5, the second sheet 12H of the front body F may be present only in the outer portion 18 and may not extend to the inner portion 19. Furthermore, unlike the illustrated example, at least one of the front body F and the back body B may not have the inner portion 19.

[0065] The material of the first sheet 12S and the second sheet 12H can be determined appropriately as long as it is a nonwoven fabric. For example, the first sheet 12S and the second sheet 12H can be a nonwoven fabric made of synthetic fibers such as polyolefins such as polyethylene and polypropylene, polyesters, and polyamides, or mixed fibers or composite fibers using two or more of these. Examples of fiber bonding methods include the air-through method and the point bond method. The fineness, basis weight, and thickness of the nonwoven fabric used for the first sheet 12S and the second sheet 12H can be determined appropriately. For example, the nonwoven fabric used for the first sheet 12S and the second sheet 12H can have a fineness of 1.0 to 2.5 dtex and a basis weight of 10 to 30 g / m, respectively. 2 Preferably, the nonwoven fabric is a long fiber nonwoven fabric having a thickness of 0.15 to 0.50 mm.

[0066] In the example shown in Figure 5, the waist elastic member 17 provided in the waist portion W is provided between the outer portion 18 and the inner portion 19, but it may also be provided between the first sheet 12S and the second sheet 12H in the outer portion 18 or the inner portion 19.

[0067] The lower waist elastic member 15 provided in the lower waist portion U is provided between the first sheet 12S and the second sheet 12H continuing from the outer portion 18, but is not limited to this and can also be provided between other sheets.

[0068] These elastic members 15, 17 are fixed to at least one of the first sheet 12S and the second sheet 12H at at least both ends of the stretchable region A2 (i.e., not only at both ends in the stretchable direction, but also across the entire stretchable direction, or intermittently in the stretchable direction). Any known method can be used for this fixing. For example, the elastic members 15, 17 can be fixed to the first sheet 12S and the second sheet 12H with a hot melt adhesive HM. The waist elastic member 17 shown in the figure employs this fixing structure. Alternatively or additionally, the elastic members 15, 17 can be fixed to the first sheet 12S and the second sheet 12H by sandwiching them between the welded portions of the first sheet 12S and the second sheet 12H, spaced apart from each other by a distance smaller than the natural length of the elastic members 15, 17. In the latter case, the surfaces of the elastic members 15, 17 can be fixed to at least one of the first sheet 12S and the second sheet 12H in addition to forming the welded portions. Furthermore, together with these, the elastic members 15, 17 can be welded to the first sheet 12S and the second sheet 12H in addition to welding the first sheet 12S and the second sheet 12H in the side seal 12A.

[0069] (dorsal barrier) Characteristically, as shown in Figures 1, 5, and 8 to 11, on the waist opening WO side of the crotch portion of the back body B, a back barrier 70 having a portion rising on the inside (toward the body surface) extends in the width direction WD from one side seal 12A to the other side seal 12A. The back barrier 70 has, throughout its width direction WD, a first portion 71 fixed to the back body B, a second portion 72 extending forward from the front edge of the first portion 71, and a third portion 73 folded back from the front edge of the second portion 72 and extending rearward. The portion of the back barrier 70 located in the middle of the width direction WD is a high-rise portion 81 in which the back surface of the second portion 72 is not joined to the front surface of the back body B over the entirety, and the front surface of the second portion 72 is not joined to the back surface of the third portion 73 over the entirety. The portions of the back barrier 70 located on either side of the high-rise portion 81 are low-rise portions 82 in which at least the front end of the back surface of the second portion 72 is joined to the front surface of the back body B over the entirety, and the front surface of the second portion 72 is not joined to the back surface of the third portion 73 over the entirety. Furthermore, an elongated barrier elastic member 74 is attached to at least the rear end of the third portion 73 along the width direction WD so as to extend from one low rise portion 82 through the high rise portion 81 to the other low rise portion 82, and the portion of the third portion 73 having the barrier elastic member 74 elastically contracts in the width direction WD together with the barrier elastic member 74 in its natural length state, and is also elastically extensible in the width direction WD.

[0070] In the drawings, the symbol HM1 indicates a hot melt adhesive for fixing the first portion 71 to the back piece B, and the symbol HM2 indicates a hot melt adhesive for fixing the second portion 72 in the low rise portion 82 to the back piece B. The hot melt adhesive for fixing the second portion 72 in the low rise portion 82 to the back piece B may be provided over almost the entire back surface of the second portion, or may be provided only on the front end portion of the back surface of the second portion.

[0071] It is preferable that the low-rise portion 82 (in the illustrated example, the portion fixed with hot melt adhesive HM2) extends over the entire width direction WD of the area between the high-rise portion 81 and the side seal 12A, as in the illustrated example; however, the low-rise portion 82 may be provided only on the high-rise portion 81 side rather than the middle of the width direction WD of the area between the high-rise portion 81 and the side seal 12A, and both the second portion 72 and the third portion 73 may be fixed in a folded state on the side seal 12A side (i.e., the back surface of at least the front end of the second portion 72 and the surface of the back body B may be joined over the entire width direction WD, and the surface of the second portion 72 and the back surface of at least the rear end of the third portion 73 may be joined over the entire width direction WD).

[0072] As shown in Figs. 9 to 11, when the pants-type disposable wearing article is worn, the third portion 73 of the back barrier 70 rises to conform to the skin and adheres closely to the skin, thereby reducing gaps between the back body portion B and the body surface and preventing leakage. In particular, as shown in Figs. 10 and 11, the back barrier 70 has a high-rise portion 81 in the middle in the width direction WD, where gaps are likely to occur, in which the second portion 72 and the third portion 73 rise (i.e., have a relatively high riseable height), while on both sides of the high-rise portion 81, the second portion 72 does not rise and only the third portion 73 rises (i.e., have a low riseable height). The high-rise portion 81 has a high riseable height, which provides excellent leakage prevention but also allows for relatively free movement. On the other hand, the low-rise portion 82 has poorer leakage prevention properties but is more likely to maintain its folded-up state. Therefore, if the entire width direction WD of the back barrier 70 were made up of the high-rise portion 81, there is a risk that the third portion 73 would partially collapse forward when putting on or while wearing the article, resulting in an undesirable state such as a poor fit. In contrast, if the low-rise portions 82 are continuous on both sides of the high-rise portion 81 as in the present article, the folded-back state of the low-rise portions 82 is maintained, and this also serves to maintain the folded-back state of the high-rise portions 81.

[0073] The first portion 71, second portion 72, and third portion 73 of the back barrier 70 can be formed by attaching a dedicated barrier sheet 75 to the back body portion B, as in the example shown in Fig. 5, or by using the inner portion 19 of the exterior bodies 12F and 12B, as in the example shown in Fig. 12. More specifically, in the back barrier 70 of the example shown in Fig. 5, the first portion 71, second portion 72, and third portion 73 are formed by a barrier sheet 75 that is folded in half at the leading end of the third portion 73 to form a two-layer structure, and a barrier elastic member 74 is fixed between the layers of the barrier sheet 75 in the third portion 73. The method of fixing the barrier elastic member 74 to the barrier sheet 75 can be selected appropriately in the same way as the fixing of the elastic members 15 and 17 of the exterior bodies 12F and 12B described above, and the same structure as that for fixing the elastic members 15 and 17 of the exterior bodies 12F and 12B can be used, or a different fixing structure can be used. The two-layer structure of the barrier sheet 75 only needs to be provided in the portion having the barrier elastic member 74, and therefore in the illustrated example, the first portion 71 and the second portion 72 do not need to have a two-layer structure. Also, in the illustrated example, the first portion 71 of the barrier sheet 75 is folded back together with the exterior bodies 12F, 12B at the edge of the waist opening WO and extends to the outer portions 18 of the exterior bodies 12F, 12B, but this is not limited thereto, and the first portion 71 may extend only to the inner portions 19 of the exterior bodies 12F, 12B, or may extend only to the crotch side of the inner portions 19 of the exterior bodies 12F, 12B.

[0074] 12, the first portion 71, the second portion 72, and the third portion 73 are formed by the inner portion 19 of the exterior bodies 12F and 12B. The first sheet 12S forming the inner portion 19 of the exterior bodies 12F and 12B is folded in half, with the leading edge of the third portion 73 as the folding position, to form a two-layer structure including the first portion 71, the second portion 72, and the third portion 73. A barrier elastic member 74 is fixed between layers of the barrier sheet 75 in the third portion 73. The method for fixing the barrier elastic member 74 to the barrier sheet 75 can be selected appropriately, similar to the method for fixing the elastic members 15 and 17 of the exterior bodies 12F and 12B described above. The same structure as that for fixing the elastic members 15 and 17 of the exterior bodies 12F and 12B can be used, or a different fixing structure can be used. The two-layer structure formed by the first sheet 12S only needs to be provided in at least the portion having the barrier elastic member 74. Therefore, in the illustrated example, the first portion 71 and the second portion 72 do not need to have a two-layer structure.

[0075] The third portion 73 preferably has a plurality of barrier elastic members 74, particularly about 3 to 5, spaced apart in the front-to-rear direction LD, while the second portion 72 may have elastic members but preferably does not have any. The barrier elastic members are provided across the entire width of the high-rising portion. On the other hand, as long as the barrier elastic members 74 are provided across most of the low-rising portion 82 on the high-rising portion 81 side, they may or may not extend to the side edges of the low-rising portion 82 (i.e., across the entire width of the back barrier).

[0076] The dimensions of each part of the back barrier 70 can be determined as appropriate. As an example, if the second portion 72 is not provided with an elastic member and the third portion 73 is provided with multiple barrier elastic members 74 spaced apart in the front-to-back direction LD, it is preferable that the barrier elastic members 74 are not provided within 5 mm of the boundary between the third portion 73 and the second portion 72. This allows the highly raised portion 81 of the third portion 73 to rise to better conform to the skin and facilitate surface contact. Furthermore, in this case, the dimension of the second portion 72 in the front-to-back direction LD is preferably 10 to 30 mm, and the dimension of the third portion 73 in the front-to-back direction LD is preferably 0.5 to 1.5 times the dimension of the second portion 72 in the front-to-back direction LD. The third portion 73 preferably has an elongation rate of 200 to 300% at maximum extension in the width direction WD. Furthermore, it is preferable that the barrier elastic member 74 is not provided within 5 mm from the rear end of the third portion 73 (the tip of the back barrier 70) and the layers of the two-layer structure are not joined together, as this will result in a hollow, flexible portion being formed at the tip of the back barrier 70.

[0077] The positions of each part of the back barrier 70 may be determined as appropriate, but it is preferable that the boundary 76 between the first part 71 and the second part 72 is located on the rear end of the absorbent body 56. Furthermore, it is preferable that the central end of the low-rise part 82 in the width direction WD is located on both ends of the absorbent body 56 in the width direction WD. If the width of the high-rise part 81 is unnecessarily wide or if the low-rise part 82, which has the shape-maintaining effect of the high-rise part 81, is easily deformed, there is a high risk that the high-rise part 81 will become undesirable due to deformation that occurs during wear. In contrast, if the low-rise part 82 extends to a part of the absorbent body 56 with a relatively high rigidity and becomes the high-rise part 81 from there, the shape-maintaining effect of the low-rise part 82 will be enhanced, and as a result, the shape-maintaining effect of the high-rise part 81 will also be enhanced.

[0078] If the tightness provided by the barrier elastic member 74 differs from the tightness provided by the elastic members 15, 17 of the exterior bodies 12F, 12B located in the vicinity thereof (in the illustrated example, the lower-waist elastic member 15), this may cause discomfort. Therefore, in this case, it is preferable that the barrier elastic member 74 and the elastic members 15, 17 of the exterior bodies 12F, 12B located in the vicinity thereof are elastic members 15, 17 of the same thickness and modulus of elasticity attached with the same elongation rate, as this reduces the likelihood of such discomfort.

[0079] <Explanation of terms used in the specification> In the present specification, the following terms have the following meanings unless otherwise specified in the specification.

[0080] "Front-rear direction" refers to the direction indicated by the symbol LD in the drawing (longitudinal direction), and "width direction" refers to the direction indicated by the symbol WD in the drawing (left-right direction), with the front-rear direction and width direction being perpendicular to each other.

[0081] "Front side" means the side closest to the wearer's skin when worn, and "reverse side" means the side farthest from the wearer's skin when worn.

[0082] "Front" means the side of a component that is closest to the wearer's skin when worn, and "back" means the side that is farthest from the wearer's skin when worn.

[0083] "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.

[0084] "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, use a sample collection template (100mm x 100mm) to cut out a sample measuring 100mm x 100mm. Measure the weight of the sample and multiply it by 100 to calculate the weight per square meter, which is the basis weight.

[0085] "Thickness" was measured using an automatic thickness measuring device (KES-G5 handy compression measurement program) with a load of 0.098 N / cm 2 , and pressure area: 2cm 2 Automatic measurement is performed under the following conditions.

[0086] The water absorption capacity is measured according to JIS K7223-1996 "Test method for water absorption capacity of superabsorbent resins."

[0087] "Deployed state" means a flat, deployed state without contraction (including any contraction, such as contraction due to elastic members) or slack.

[0088] Unless otherwise specified, the dimensions of each part refer to the dimensions in the unfolded state, not in the natural length state.

[0089] If no environmental conditions are specified for a test or measurement, the test or measurement shall be carried out in a test room or device under standard conditions (temperature 23±1°C, relative humidity 50±2%). [Industrial Applicability]

[0090] The present invention can be used in pants-type disposable wearing articles such as pants-type disposable diapers and pants-type sanitary napkins. [Explanation of symbols]

[0091] 11...liquid-impermeable sheet, 12A...side seal, 12B...rear outer body, 12E...waist extension portion, 12F, 12B...outer body, 12F...front outer body, 12H...second sheet, 12S...first sheet, 13...cover nonwoven fabric, 15, 17...elastic member, 15...lower waist elastic member, 17...waist elastic member, 18...outer portion, 19...inner portion, 200...inner body, 201, 202...inner body fixing portion, 30...top sheet, 40...intermediate sheet, 50...absorbent element, 56...absorbent body, 58...packaging sheet, 60...rising gather , 60A...tip side portion, 60B...base side portion, 62...gathered nonwoven fabric, 67...folded portion, 68...free portion, 70...back barrier, 71...first portion, 72...second portion, 73...third portion, 74...barrier elastic member, 75...barrier sheet, 81...high rise portion, 82...low rise portion, A1...non-stretchable region, A2...stretchable region, B...back body, C...buttocks covering portion, F...front body, L...middle region, LD...front and rear direction, LO...leg opening, T...torso region, U...lower waist portion, W...waist portion, WD...width direction, WO...waist opening.

Claims

1. An integrated outer body extending from the front body to the back body, or an outer body provided separately on the front body and the back body, An inner body attached to the middle of the outer body in the width direction so as to extend from the front body through the crotch area to the back body; A pair of side seals formed by joining both side portions of the exterior body in the front body and both side portions of the exterior body in the back body, respectively; a waist opening formed by the front edge of the front body and the rear edge of the back body; leg openings provided on both sides of the interior body, a back barrier having an inwardly rising portion extending in a width direction from one of the side seals to the other side seal on a side closer to the waist opening than the crotch portion in the back body; the back-side barrier has, across its entire width, a first portion fixed to the rear body, a second portion extending forward from a front edge of the first portion, and a third portion folded back from the front edge of the second portion and extending rearward; a portion of the back-side barrier located at the middle in the width direction is a high-rise portion in which the back surface of the second portion and the front surface of the back body are not joined together over the entirety, and the front surface of the second portion and the back surface of the third portion are not joined together over the entirety; the back-side barrier has portions located on both sides of the high-rise portion, each of which is a low-rise portion in which at least a front end portion of the back surface of the second portion is joined to the front surface of the back body over the entirety, and the front surface of the second portion is not joined to the back surface of the third portion over the entirety; an elongated barrier elastic member is attached to at least a rear end of the third portion along the width direction so as to extend from one of the low rise portions through the high rise portion to the other low rise portion; a portion of the third portion having the barrier elastic member elastically contracts in the width direction together with the barrier elastic member in a natural length state, and is elastically extensible in the width direction; A pants-type disposable wearing article characterized by:

2. The dimension of the second portion in the front-to-rear direction is 10 to 30 mm, The second portion is not provided with an elastic member, the dimension of the third portion in the front-to-rear direction is 0.5 to 1.5 times the dimension of the second portion in the front-to-rear direction; The third portion includes a plurality of barrier elastic members provided at intervals in the front-rear direction, an elastic member is not provided within 5 mm of a boundary between the third portion and the second portion; The third portion has a maximum elongation rate of 200 to 300% in the width direction.

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

3. the inner body has an absorber extending from a position forward of the crotch portion to the first portion, The end portion of the low rise portion on the center side in the width direction is located on both end portions in the width direction of the absorbent body.

3. The pants-type disposable wearing article according to claim 1 or 2.

4. a longitudinally elongated elastic member is attached to at least both front and rear sides of the third portion in a longitudinal range of the exterior body including the side seal, and the elastic member is attached to each side of the third portion in a width direction; a region of the exterior body having the elastic member elastically contracts in the width direction together with the elastic member of the exterior body in a natural length state and is elastically extensible in the width direction; The barrier elastic member and the elastic member of the exterior body are elastic members having the same thickness and elastic modulus and attached at the same elongation rate. The pants-type disposable wearing article according to any one of claims 1 to 3.

Images