Disposable pants-type 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] This invention relates to a pant-type disposable wearable article having a back leakage prevention function. [Background technology]

[0002] Disposable wearable items such as pant-type disposable diapers and pant-type sanitary napkins have elasticity in the width direction around the waist, making it difficult for gaps to form between the wearer's back and the diaper, thus reducing the likelihood of urine or other excretions leaking from the back (so-called back leakage).

[0003] For example, a typical disposable pull-up diaper comprises an outer body that forms at least the waist area of ​​the front and back panels, and an inner body containing an absorbent material attached to the outer body so as to extend from the front to the back. The side edges of the front outer body and the side edges of the back outer body are joined to form a side seal, thereby creating a waist opening and a pair of left and right leg openings. The outer body is provided with an elastic member in the waist area defined as the front-to-back range where the side seal is located (the front-to-back range from the waist opening to the upper end of the leg openings), thereby adding elasticity in the width direction. As for the elastic member, in addition to using an elongated elastic member such as elastic thread, it is also known to use an elastic film (see, for example, Patent Documents 1-2).

[0004] Furthermore, to further enhance the ability to prevent leakage from the back, it has been proposed to provide a dorsal barrier in pant-type disposable wear items (see, for example, Patent Document 1).

[0005] However, with conventional disposable pants-type garments equipped with a dorsal barrier, the dorsal barrier was sometimes used in a collapsed state. Specifically, the dorsal barrier is attached in a flattened state during manufacturing and is not only pressed in the thickness direction, but also remains pressed in the thickness direction until use. As a result, even when using the product, the raised portion may remain collapsed and weakly attached to the opposite surface. Therefore, if this situation is not noticed during use, the leak prevention function may be insufficient, and it is desirable to raise the dorsal barrier once before use. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2001-252303 [Patent Document 2] Japanese Patent Publication No. 2013-75106 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] Therefore, the main objective of the present invention is to provide a pant-type disposable wearable item in which the dorsal barrier automatically rises up to fit. [Means for solving the problem]

[0008] The following disposable pant-type garments solve the above problems. <First aspect> An integrated outer covering extending from the front to the back, or outer coverings separately provided on the front and back, An inner body is attached to the middle of the width direction of the outer body so as to extend from the front body through the crotch area to the back body, A pair of side seals are formed by joining together both sides of the outer covering on the front panel and both sides of the outer covering on the back panel, A waist opening formed by the front edge of the front bodice and the back edge of the back bodice, The interior body is provided with leg openings on both sides, On the back of the garment, a back barrier having a portion that rises inward extends in the width direction from one side seal to the other side seal, on the side of the waist opening that is closer to the crotch area. The dorsal barrier has, over its entire width, a first portion fixed to the back panel, a second portion extending forward from the front edge of the first portion, and a third portion folded back from the front edge of the second portion and extending backward. The portion of the back barrier located in the middle in the width direction is a raised portion in which the back surface of the second portion and the front surface of the back panel are not joined together throughout, and the front surface of the second portion and the back surface of the third portion are not joined together throughout. The portions of the back barrier located on both sides of the high-rising portion are low-rising portions in which at least the front end of the back surface of the second portion and the surface of the back panel are joined together over the entire length, while the surface of the second portion and the back surface of the third portion are not joined together over the entire length. An elongated barrier elastic member is attached to at least the rear end of the third portion, extending in the width direction from one of the low-rising portions through the high-rising portion to the other low-rising portion. The portion of the third part having the barrier elastic member is elastically contracted in the width direction together with the barrier elastic member in its natural length state, and is also elastically stretchable in the width direction. A pant-type disposable wearable article characterized by the following features.

[0009] (Effects and Benefits) In these disposable pant-type garments, the third portion of the back barrier rises to conform to the skin during wear, thereby reducing gaps between the back and the body surface and preventing leaks. Specifically, the back barrier has a high rise section in the middle of the width direction where gaps are likely to occur, where both the second and third portions rise (i.e., the height to which they can rise is relatively high), while on both sides, the second portion does not rise and only the third portion rises (i.e., the height to which they can rise is low). The high rise section offers superior leak prevention due to its high rise height, but also allows for relatively free movement. On the other hand, the low rise section is less leak-proof, but its folded state is easier to maintain. Therefore, if the entire width direction of the back barrier were a high rise section, there is a risk that the third portion may partially collapse forward during putting on or wearing the garment, worsening the fit and resulting in undesirable conditions. In contrast, in this product, where low-rising sections are continuous on both sides of a high-rising section, the folded state of the high-rising section is maintained by the action of maintaining the folded state of the low-rising section.

[0010] <Second aspect> The front-to-back dimension of the second part is 10-30 mm. The second portion is not provided with an elastic member. The front-to-back dimension of the third part is 0.5 to 1.5 times the front-to-back dimension of the second part. The third portion is provided with multiple barrier elastic members spaced apart 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 elongation rate of the third portion at its maximum widthwise extension is 200-300%. A disposable, wearable item of the pant type according to the first embodiment.

[0011] (Effects and Benefits) The dimensions and the like of each part of the back barrier can be determined as appropriate, but it is preferable that within the scope of this embodiment, the raised part of the third part rises more along the skin and is more likely to come into contact with the surface.

[0012] <The third aspect> The interior body has an absorber extending from the front side of the crotch part to the first part. The end on the center side in the width direction of the low-raised part is located on both ends in the width direction of the absorber. A pants-type disposable wearing article according to the first or second aspect.

[0013] (Function and effect) If the width of the high-raised part is unnecessarily wide or the low-raised part having the function of maintaining the shape of the high-raised part is easily deformed, the possibility that the high-raised part will be in an unfavorable state due to the deformation occurring during wearing increases. On the other hand, in this embodiment, the low-raised part extends to the part having a relatively high-rigidity absorber, and then becomes the high-raised part. Therefore, the function of maintaining the shape of the low-raised part is enhanced, and as a result, the function of maintaining the shape of the high-raised part is also enhanced.

[0014] <The fourth aspect> In the range in the front-rear direction of the outer body having the side seal, at least on both the front and rear sides adjacent to the third part, elongated elastic members along the width direction are respectively attached. The region of the outer body having the elastic member is elastically contracted in the width direction together with the elastic member of the outer body in the state of the natural length and is elastically extensible in the width direction. The barrier elastic member and the elastic member of the outer body are those in which elastic members having the same thickness and the same elastic modulus are attached at the same elongation rate. A pants-type disposable wearing article according to any one of the first to third aspects.

[0015] (Function and effect) In disposable, pant-type garments, it is common for the outer garment to have an elastic member that extends along the width direction around the waist. In this case, if the feeling of tightness from the barrier elastic member differs from the feeling of tightness from the elastic members of the outer garment located near the front and back of the barrier elastic member, it may cause discomfort. Therefore, as in this embodiment, it is preferable to attach the barrier elastic member and the elastic members of the outer garment located near the front and back of the barrier elastic member to be elastic members of the same thickness and elastic modulus with the same elongation rate to minimize discomfort. [Effects of the Invention]

[0016] As described above, the present invention offers advantages such as the dorsal barrier automatically rising and fitting to the body. [Brief explanation of the drawing]

[0017] [Figure 1] This is a plan view showing the inner surface of a pant-type disposable diaper in its unfolded state. [Figure 2] This is a plan view showing the outer surface of a pant-type disposable diaper in its unfolded state. [Figure 3] This is a cross-sectional view of section 2-2 in Figure 1. [Figure 4] This is a cross-sectional view of section 3-3 in Figure 1. [Figure 5] (a) A cross-sectional view of line 4-4 in Figure 1, and (b) a cross-sectional view of line 5-5 in Figure 1. [Figure 6] This is a perspective view of a pull-up type disposable diaper. [Figure 7] This is a plan view showing the outer surface of the interior unit in its deployed state, along with the outline of the exterior unit. [Figure 8] This is a cross-sectional view of section 6-6 in Figure 1. [Figure 9] This is a perspective view showing the main parts of the inside of a pull-up type disposable diaper. [Figure 10] This is a schematic diagram showing a cross-section of the dorsal barrier, viewed from near the groin area towards the waist opening. [Figure 11] (a) A schematic diagram of the longitudinal section of the high-rise portion, and (b) A schematic diagram of the longitudinal section of the low-rise portion. [Figure 12] (a) A cross-sectional view of another example corresponding to section 4-4 in Figure 1, and (b) A cross-sectional view of another example corresponding to section 5-5 in Figure 1. [Modes for carrying out the invention]

[0018] The following describes a disposable diaper of the pant type as an example of a disposable wearable item of the pant type, with reference to the attached drawings. Each adjacent component in the thickness direction is fixed or joined as necessary, in the same way as known diapers, in addition to the fixing or joining parts described below. The dotted pattern in the cross-sectional view indicates adhesives such as hot melt adhesives used as fixing or joining means. Hot melt adhesives can be applied by known methods such as slot application, continuous linear or dotted bead application, spiral, Z-shaped, or wavy spray application, or pattern coating (transfer of hot melt adhesive using a relief printing method). Alternatively, or in conjunction with these methods, at the fixing parts of elastic members, hot melt adhesive can be applied to the outer surface of the elastic member to fix the elastic member to the adjacent member. Examples of hot melt adhesives include EVA-based, adhesive rubber-based (elastomer-based), polyolefin-based, and polyester / polyamide-based adhesives, but they can be used without particular limitation. As fixing or joining means for joining each component, means of material welding such as heat sealing or ultrasonic sealing can also be used. 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 with hot melt adhesive, intermittent pattern coating such as spiral, Z-shaped, or wavy can be suitably used. When coating an area exceeding the coating width of a single nozzle, intermittent pattern coating such as spiral, Z-shaped, or wavy can be performed with or without gaps in the width direction. As a joining means for joining each component, material welding methods such as heat sealing or ultrasonic sealing can also be used.

[0019] Furthermore, in the following description, known nonwoven fabrics can be used as appropriate depending on the part and purpose. The constituent fibers of the nonwoven fabric can be selected without particular limitation, including, for example, polyolefin-based fibers such as polyethylene or polypropylene, polyester-based fibers, polyamide-based fibers, etc. (including single-component fibers as well as composite fibers such as core-sheath fibers), regenerated fibers such as rayon and cupro, and natural fibers such as cotton, and these can also be used in mixtures. To increase the flexibility of the nonwoven fabric, it is preferable to use crimped fibers as constituent fibers. In addition, the constituent fibers of the nonwoven fabric may be hydrophilic fibers (including fibers that have become hydrophilic due to a hydrophilizing agent), hydrophobic fibers, or water-repellent fibers (including fibers that have become water-repellent due to 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 lamination structure into short fiber nonwoven fabrics, long fiber nonwoven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, thermal bond (air-through) nonwoven fabrics, needle punch nonwoven fabrics, point bond nonwoven fabrics, and laminated nonwoven fabrics (including SMS nonwoven fabrics and SMMS nonwoven fabrics, etc., which have a meltblown layer sandwiched between spunbond layers), and any of these nonwoven fabrics can be used.

[0020] Figures 1 to 6 show a pant-type disposable diaper. This pant-type disposable diaper has an annular waist region T formed by joining both sides of the front panel F and both sides of the back panel B with side seals 12A, an intermediate region L extending from the waist region T of the front panel F through the crotch area to the waist region T of the back panel B, a waist opening WO provided on the side of the waist region T opposite the intermediate region L, and leg openings LO provided on both sides of the intermediate 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 the upper end of the leg opening LO and extending in the width direction, and the intermediate region L is defined as the range LD in the front-to-back direction between the lower end of the side seal 12A of the front panel F and the lower end of the side seal 12A of the back panel B. In the unfolded state shown in Figures 1 and 2, both side edges of the intermediate region L are constricted in a U-shape or curved shape to conform to the wearer's legs, and the overall shape of the diaper is roughly hourglass-shaped.

[0021] Furthermore, this pant-type disposable diaper comprises two main assemblies, namely outer bodies 12F and 12B that form at least the waist area T, and an inner body 200 attached to the outer bodies 12F and 12B so as to extend from the front body F to the back body B. The openings formed by the front and rear ends of the outer bodies 12F and 12B become the waist opening WO through which the wearer's torso passes, and the portions enclosed on both sides in the width direction of the inner body 200 by the lower edges of the outer bodies 12F and 12B and the side edges of the inner body 200, respectively, become the leg openings LO through which the legs pass. The inner body 200 is the part that absorbs and retains excrement such as urine, and the outer bodies 12F and 12B are the parts that support the inner body 200 against the wearer's body. Also, the symbol Y indicates the total length of the diaper in the unfolded state (the length LD in the front-to-back direction 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 indicates the total width of the diaper in the unfolded state.

[0022] (Interior structure) The inner lining 200 can take any shape, but in the illustrated form it is rectangular. As shown in Figures 3 to 5, the inner lining 200 comprises a top sheet 30 that faces the body, a liquid-impermeable sheet 11, and an absorbent element 50 interposed between them, and is an assembly that performs the absorption function. Reference numeral 40 indicates 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 indicates riser gathers 60 that extend from both sides of the inner lining 200 to contact the wearer's legs in order to prevent excrement from leaking out on both sides of the inner lining 200.

[0023] (Top sheet) The top sheet 30 is permeable to liquids and can be made of perforated or non-perforated nonwoven fabrics or perforated plastic sheets, for example. 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] Both sides of the top sheet 30 may be folded back to the back at the side edges of the absorption element 50, or they may be left unfolded and protrude laterally beyond the side edges of the absorption element 50.

[0025] To prevent misalignment of the top sheet 30 relative to the back-side component, it is desirable to fix it to the adjacent component on the back side using a joining method that involves material welding, such as heat sealing or ultrasonic sealing, or by using a hot-melt adhesive. 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 56 by a hot-melt adhesive applied to its back surface.

[0026] (Intermediate sheet) To quickly transfer the liquid that has permeated through the top sheet 30 to the absorbent material 56, and to prevent the "backflow" phenomenon of the absorbed liquid from the absorbent material 56, an intermediate sheet (also called a "second sheet") 40 can be provided, which has a faster liquid permeation rate than the top sheet 30. The intermediate sheet 40 can also be omitted.

[0027] Examples of the intermediate sheet 40 include the same material as the top sheet 30, as well as spunlace nonwoven fabric, spunbond nonwoven fabric, SMS nonwoven fabric, pulp nonwoven fabric, a mixed sheet of pulp and rayon, point-bonded nonwoven fabric, or crepe paper. Air-through nonwoven fabric is particularly preferred due to its bulkiness. For air-through nonwoven fabric, it is preferable to use a composite fiber with a core-sheath structure. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET), which has high rigidity, is preferred. The basis weight is 17-80 g / m². 2Preferably, 17-50 g / m 2 This is more preferable. The thickness of the raw fibers for the nonwoven fabric is preferably 2.0 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use off-center fibers without a core in the center, hollow fibers, or off-center and hollow fibers as all or part of the mixed fibers of the raw fibers.

[0028] In the illustrated example, the intermediate sheet 40 is shorter than the width of the absorbent body 56 and positioned in the center, but it may also be provided across the entire width. The length of the intermediate sheet 40 in the front-to-back direction may be the same as the total length of the diaper, the same as the length of the absorbent element 50, or it may be within a short length range centered on the area that receives liquid.

[0029] It is desirable to fix the intermediate sheet 40 to the adjacent member on the back side using a joining method that involves material welding, such as heat sealing or ultrasonic sealing, or by hot melt adhesive, for purposes such as preventing misalignment with the member on the back 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 56 by hot melt adhesive applied to its back surface.

[0030] (Liquid-impermeable sheet) The material of the liquid-impermeable sheet 11 is not particularly limited, but examples include plastic films made of polyolefin resins such as polyethylene and polypropylene, laminated nonwoven fabrics with a plastic film on the surface of a nonwoven fabric, and laminated sheets made by layering and bonding a nonwoven fabric to a plastic film. It is preferable to use a material that is both liquid-impermeable and breathable for the liquid-impermeable sheet 11, as this is preferred from the viewpoint of preventing stuffiness. As a breathable plastic film, a microporous plastic film obtained by kneading an inorganic filler into a polyolefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching it in a uniaxial or biaxial direction is widely used. In addition to the above, nonwoven fabrics using microdenier fibers, nonwoven fabrics whose leak-proof properties are enhanced by reducing the voids in the fibers through the application of heat or pressure, and sheets that are made impermeable to liquids without using plastic films, such as those coated with superabsorbent resins, hydrophobic resins, or water-repellent agents, can also be used as impermeable sheets 11. However, it is desirable to use a resin film in order to obtain sufficient adhesive strength when bonding with the cover nonwoven fabric 13, which will be described later, via a hot-melt adhesive.

[0031] The liquid-impermeable sheet 11 is designed to fit behind the absorbent element 50, as shown in the figure. In addition, to enhance leak prevention, it can be extended around both sides of the absorbent element 50 to the sides of the top sheet 30 of the absorbent element 50. The width of this extended portion should be approximately 5 to 20 mm on each side.

[0032] (Gathered up) The rise-up gathers 60 extend along both sides of the inner lining 200 over the entire length of the front-to-back LD and are provided to contact the wearer's legs and prevent lateral leakage. The rise-up gathers 60 can be omitted if necessary.

[0033] The rising gathers 60 (so-called three-dimensional gathers) shown in Figures 1, 3, and 4 rise from the sides of the interior body 200 to the front. In these rising gathers 60, the base portion 60B rises diagonally toward the center in the width direction, and the tip portion 60A rises diagonally toward the outside in the width direction from the middle portion, but it is not limited to this, and it is possible to make appropriate changes, such as a form in which the entire structure rises toward the center in the width direction.

[0034] More specifically, the rise-up gather 60 in the illustrated example is made by folding a strip of gathered nonwoven fabric 62, which has a length equal to the front-to-back length of the inner lining 200, in the width direction WD at the tip and overlapping it in half, and fixing multiple elongated gathered elastic members 63 in an extended state along the longitudinal direction, spaced apart in the width direction WD, between the folded portion and the sheets in the vicinity thereof. The base end of the rise-up gather 60, located opposite the tip (the end opposite the folded portion in the width direction WD), is a root portion 65 fixed to the side of the inner lining 200 on the back side of the liquid-impermeable sheet 11, and the portion other than this root portion 65 is a main body portion 66 (the portion on the folded portion side) extending from the root portion 65. Furthermore, the main body portion 66 has a base portion 60B that extends towards the center in the width direction, and a tip portion 60A that is folded back at the tip of the base portion 60B and extends outward in the width direction. This form is a surface contact type rising gather 60, but a line contact type rising gather 60 that is not folded back outward in the width direction can also be adopted. The front and rear ends of the main body portion 66 are fixed to the side surface of the top sheet 30 in a folded state as a folded portion 67, while the front and rear intermediate portion located between them is an unfixed free portion 68, and a gathered elastic member 63 that is aligned with the front and rear direction LD is fixed in an extended state to at least the tip of this free portion 68.

[0035] In the rise-up gather 60 configured as described above, the contraction force of the gather elastic member 63 acts to bring both ends in the front-to-back direction closer together. However, while both ends of the main body portion 66 in the front-to-back direction are fixed so as not to stand up, the area between them is an unfixed free portion 68. Therefore, only the free portion 68 stands up so as to come into contact with the body side, as indicated by the arrows in Figure 3. In particular, if 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 area and its vicinity, so that the rise-up gather 60 comes into contact with the legs over a surface area, improving the fit.

[0036] In a bent form where the main body portion 66 consists of a base portion 60B extending toward the center in the width direction and a tip portion 60A that is folded back at the tip of the base portion 60B and extends outward in the width direction, the tip portion 60A and the base portion 60B are joined in a collapsed state at the collapsed portion 67, and the base portion 60B is joined to the top sheet 30 in a collapsed state. For joining the opposing surfaces at the collapsed portion 67, at least one of hot melt adhesives applied by various methods and material welding means such as heat sealing or ultrasonic sealing can be used. In this case, the joining of the base portion 60B and the top sheet 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 configuration is to join the base portion 60B and the top sheet 30 using a hot melt adhesive, and to join the tip portion 60A and the base portion 60B by material welding.

[0037] As the gathered nonwoven fabric 62, flexible, uniform, and opaque nonwoven fabrics such as spunbond nonwoven fabrics (SS, SSS, etc.), SMS nonwoven fabrics (SMS, SSMMS, etc.), and meltblown nonwoven fabrics, which have been treated with a water-repellent coating such as silicone as needed, can be suitably used, and the fiber weight should be 10-30 g / m². 2It is preferable to have a degree of gathering. As the gathered elastic member 63, thread elastic or the like can be used. When spandex thread elastic is used, the thickness is preferably 470 to 1240 dtex, and more preferably 620 to 940 dtex. The elongation rate when fixed is preferably 150 to 350%, and more preferably 200 to 300%. In addition, as shown in the figure, a waterproof film 64 can be interposed between the two folded gathered nonwoven fabrics 62, and in this case, the gathered nonwoven fabric 62 can be partially omitted in the part where the waterproof film 64 is present, but in order to make the appearance and feel of the product like cloth, it is necessary that at least the outer surface from the base end to the tip of the rising gather 60 is formed of gathered nonwoven fabric 62, as shown in the illustrated example.

[0038] The number of elastic gather members 63 provided in the free portion of the rising gather 60 is preferably 2 to 6, and more preferably 3 to 5. The spacing between them is appropriately 3 to 10 mm. With this configuration, the area where the elastic gather members 63 are placed will be more likely to make contact with the skin over a larger surface area. Elastic gather members 63 may be placed not only at the tip but also at the base.

[0039] In the free portion 68 of the rising gather 60, at least one of the following methods can be used to bond the inner and outer layers of the gathered nonwoven fabric 62 and to fix the gathered elastic member 63 sandwiched between them: hot melt adhesive applied by various methods and fixing means such as heat sealing or ultrasonic sealing. Bonding the entire inner and outer layers of the gathered nonwoven fabric 62 would impair flexibility, so it is preferable that the parts of the gathered elastic member 63 other than the bonded parts are not bonded or are weakly bonded. In the illustrated example, hot melt adhesive is applied only to the outer surface of the gathered elastic member 63 using an application means such as a comb gun or Surewrap nozzle, and it is sandwiched between the inner and outer layers of the gathered nonwoven fabric 62. This structure allows the gathered elastic member 63 to be fixed to the inner and outer layers of the gathered nonwoven fabric 62 and to be fixed between the inner and outer layers of the gathered nonwoven fabric 62 using only the hot melt adhesive applied to the outer surface of the gathered elastic member 63.

[0040] Similarly, for fixing the waterproof film 64 incorporated into the rising gather 60 and the gathered nonwoven fabric 62, and for fixing the collapsed portion 67, at least one of the following methods can be used: hot melt adhesive applied by various methods, and material welding such as heat sealing or ultrasonic sealing.

[0041] (Absorption element) The absorbent element 50 comprises an absorbent body 56 and a packaging sheet 58 that encloses the entire absorbent body 56. The packaging sheet 58 may be omitted in some cases.

[0042] (Absorbent) The absorbent body 56 can be formed from a fiber aggregate. This fiber aggregate can be made by stacking short fibers such as cotton pulp or synthetic fibers, or by using filament aggregates obtained by opening tows (fiber bundles) of synthetic fibers such as cellulose acetate as needed. For fiber basis weight, when using cotton pulp or stacked short fibers, for example, 100-300 g / m² is used. 2 It can be set to a certain extent, and in the case of filament aggregates, for example, 30-120 g / m². 2 The fineness can be set to a certain extent. In the case of synthetic fibers, the fineness 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 crimped fibers are preferred. The degree of crimp of the crimped fibers can be, for example, 5 to 75 per 2.54 cm, preferably 10 to 50, and more preferably 15 to 50. Uniformly crimped fibers can also be used. It is preferable to disperse and retain highly absorbent polymer particles in the absorbent body 56.

[0043] The absorbent material 56 may be rectangular in shape, but as shown in Figure 7, it is preferable to have an hourglass shape with a constricted portion 56N in the middle in the front-to-back direction that is narrower than both the front and back sides, because this improves the fit of the absorbent material 56 itself and the riser gather 60 around the legs.

[0044] Furthermore, the dimensions of the absorbent body 56 can be appropriately determined as long as it extends in all directions (front, back, left, and right) around the urinary opening, but it is preferable that it extends to the peripheral edge of the inner body 200 or its vicinity in the front-to-back direction LD and the width direction WD. Reference numeral 56X indicates the total width of the absorbent body 56.

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

[0046] While there are no particular limitations on the material used for the superabsorbent polymer particles, those with a water absorption capacity of 40 g / g or more are preferred. Examples of superabsorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based materials. Starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, crosslinked sodium carboxymethylcellulose, and acrylic acid (salt) polymers can be used. While the commonly used granular form is preferred for the superabsorbent polymer particles, other forms can also be used.

[0047] The basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the application of the absorbent material 56. Therefore, it is not possible to say definitively, but it is generally between 50 and 350 g / m². 2 It can be done this way.

[0048] (Packaging sheet) When using the packaging sheet 58, as its material, tissue paper, particularly crepe paper, non-woven fabric, poly-laminated non-woven fabric, a sheet with small holes, etc. can be used. However, it is desirable that the sheet prevents the high-absorbency polymer particles from escaping. When using non-woven fabric instead of crepe paper, hydrophilic SMS non-woven fabric (SMS, SSMMS, etc.) is particularly suitable, and its material can use polypropylene, polyethylene / polypropylene composite material, etc. The basis weight is 5~40 g / m 2 , particularly 10~30 g / m 2 is desirable.

[0049] The packaging form of the packaging sheet 58 can be determined as appropriate. From the viewpoints of ease of manufacture and prevention of leakage of high-absorbency polymer particles from the front and rear edges, etc., it is wound cylindrically so as to surround the front, back, and both side surfaces of the absorber 56, and the front and rear edge portions thereof protrude from the front and rear of the absorber 56, and the overlapping portions of the wound and overlapping portions and the front and rear protruding portions are joined by joining means such as hot melt adhesive and material welding. This form is preferable.

[0050] (Cover non-woven fabric) In the case of a disposable diaper of the outer two-piece type pant type, since the interior body 200 is exposed between the front outer body 12F and the rear outer body 12B, a cover non-woven fabric 13 is provided to cover the back surface of the interior body 200 from between the front outer body 12F and the interior body 200 to between the rear outer body 12B and the interior body 200 so that the liquid-impermeable sheet 11 is not exposed on the back surface of the interior body 200. This is preferable.

[0051] The cover non-woven fabric 13 is not particularly limited by the type of fiber and the method of fiber bonding (interlacing). For example, the same ones as the first sheet and the second sheet of the outer bodies 12F and 12B described later can be appropriately selected. As an example of the cover non-woven fabric 13, an air-through non-woven fabric can be preferably used. In that case, the basis weight is 20~40 g / m 2 , and the thickness is preferably 0.3~1.0 mm. As the cover non-woven fabric 13, a non-porous non-woven fabric having no holes penetrating the front and back surfaces may be used, or a porous non-woven fabric having a large number of holes penetrating the front and back surfaces at intervals may be used.

[0052] The front-to-rear range of the cover nonwoven fabric 13 is not particularly limited. As shown in Figures 2 and 5, it may extend in the front-to-rear direction LD over the entire length from the front end to the rear end of the interior body 200. As shown in Figure 7, it may extend in the front-to-rear direction LD from the midpoint of the overlapping area between the front exterior body 12F and the interior body 200 to the midpoint of the overlapping area between the rear exterior body 12B and the interior body 200. In the example shown in Figure 7, the front-to-rear length 13y of the overlapping portion between the cover nonwoven fabric 13 and the front exterior body 12F, and the front-to-rear length 13y of the overlapping portion between the cover nonwoven fabric 13 and the rear exterior body 12B can be determined as appropriate, but are usually about 20 to 40 mm each.

[0053] The widthwise range of the cover nonwoven fabric 13 is such that it can conceal 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 lift-up gathers 60, the cover nonwoven fabric 13 is provided to cover a widthwise range from the back surface of the base end of at least one lift-up gather 60 to the back surface of the base end of the other lift-up 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 lift-up gathers 60. Alternatively, even if the gathered nonwoven fabric 62 covers the back surfaces of both widthwise ends of the cover nonwoven fabric 13 instead of the widthwise ends of the cover nonwoven fabric 13 covering the back surfaces of the base ends of the lift-up gathers 60, it is still possible to conceal the liquid-impermeable sheet 11 with the cover nonwoven fabric 13 and the gathered nonwoven fabric 62. In this case, since both sides of the cover nonwoven fabric 13 are covered by the gathered nonwoven fabric 62, there is an advantage that both sides 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 opposing surfaces via hot-melt adhesive. The fixed area of ​​the cover nonwoven fabric 13 can be the entire front-to-back and widthwise directions, or a portion can be left unfixed. For example, if both ends of the cover nonwoven fabric 13 in the widthwise direction are left unfixed, the cover nonwoven fabric 13 will be less affected even if the sides of the absorbent body 56 contract somewhat due to the influence of the rising gathers 60, resulting in the advantage that wrinkles and folds are less likely to form in the cover nonwoven fabric 13. In this case, the width of the unfixed portion at both ends of the cover nonwoven fabric 13 in the widthwise direction can be determined as appropriate, but for example, it can be 3 to 10 mm, preferably 5 to 8 mm.

[0055] (Interior body fixing part) The interior body 200 can be fixed to the exterior bodies 12F and 12B by joining means such as heat sealing or ultrasonic sealing, which involve material welding, or by using a hot melt adhesive. In the illustrated example, the interior body 200 is fixed to the inner surfaces of the exterior bodies 12F and 12B via a hot melt adhesive applied to the back surface of the interior body 200, that is, in this case, the back surface of the liquid-impermeable sheet 11 and the base portion 65 of the rising gather 60. The interior body fixing parts 201 and 202 that fix the interior body 200 to the exterior bodies 12F and 12B can be provided over almost the entire area where they overlap, as shown in Figure 2, and can also be provided in the portion excluding both ends in the width direction of the interior body 200.

[0056] (Exterior) The outer garments 12F and 12B in the illustrated example consist of a rectangular front outer garment 12F that forms the waist area T of the front body F, and a rectangular rear outer garment 12B that forms the waist area T of the back body B. The front outer garment 12F and the rear outer garment 12B are not continuous at the crotch and are separated in the front-to-back direction LD. This separation distance 12d can be, for example, about 0.4 to 0.5 times the total length Y. The outer garments 12F and 12B may also be a single, continuous piece that passes through the crotch area from the front body F to the back body B.

[0057] The portion of the outer casing 12F and 12B located in the waist 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 the waist portion. If the portion of the outer casing 12F and 12B located in the waist region T has a boundary where the stretching force 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 on the waist opening WO side of the boundary that is closest to the waist opening WO. If there is no such boundary, the waist extension portion 12E that extends beyond the absorber 56 or inner casing 200 towards the waist opening WO becomes the waist portion W. The lengths of these in the front-to-back direction LD vary depending on the size of the product and can be determined as appropriate, but for example, the waist portion W can be 15 to 40 mm and the lower waist portion U can be 65 to 120 mm.

[0058] Furthermore, in the illustrated example, the front outer casing 12F and the rear outer casing 12B have equal dimensions in the front-to-back direction LD, and neither has a portion located in the intermediate region L. However, as shown by the dashed line in Figure 7, the rear outer casing 12B has a longer front-to-back dimension than the front outer casing 12F, and the front outer casing 12F does not have a portion located in the intermediate region L, but the rear outer casing 12B may have a buttock cover portion C extending from the torso region T towards the intermediate region L. Although not shown, the front outer casing 12F may also be provided with an inguinal cover portion extending from the torso region T towards the intermediate region L, or it may be provided with an inguinal cover portion but not a buttock cover portion.

[0059] The outer casings 12F and 12B incorporate elastic members 15 and 17 to improve the fit around the wearer's waist, forming an elastic stretchable region A2 that stretches and contracts in the width direction WD along with the expansion and contraction of the elastic members 15 and 17. In this stretchable region A2, when at its natural length, it contracts in the width direction WD together with the elastic members 15 and 17 to form pleats, and when worn, stretched in the width direction WD together with the elastic members 15 and 17, the pleats spread out, allowing it to stretch to a predetermined elongation rate where it is fully extended without pleats. As the elastic members 15 and 17, any known elongated elastic members such as threads or strips can be used without particular limitation. Synthetic rubber or natural rubber may be used as the elastic members 15 and 17.

[0060] To describe the elastic members 15 and 17 in the illustrated example in more detail, multiple waist elastic members 17 are attached to the waist portion W of the outer bodies 12F and 12B at intervals in the front-rear direction so as to be continuous throughout the entire width direction WD. Furthermore, one or more of the waist elastic members 17 located in the region adjacent to the lower waist portion U may overlap with the inner body 200, or they may be provided on both sides in the width direction, excluding the central portion in the width direction that overlaps with the inner body 200. The waist elastic members 17 have a thickness of 155 to 1880 dtex, particularly around 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 mm²). 2 Especially 0.1~1.0mm 2 It is preferable to provide 2 to 15 strands, particularly 4 to 10 strands, of elastic thread (of a certain degree) at intervals of 2 to 12 mm, especially at intervals of 3 to 7 mm, and the resulting elongation rate of the width direction WD of the waist portion W is preferably 150 to 400%, particularly 220 to 320%. The spacing of the front-rear direction LD of the waist elastic member 17 may be constant or may change in the middle of the front-rear direction LD.

[0061] Furthermore, it is preferable that multiple waist-lower elastic members 15, made of elongated elastic material, are attached to the waist-lower portion U of the outer casings 12F and 12B at intervals in the front-to-back direction. The waist-lower elastic members 15 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, the cross-sectional area should be 0.05 to 1.5 mm²). 2 Especially 0.1~1.0mm 2 It is preferable to provide about 5 to 30 strands of elastic thread (of a certain degree) at intervals of 1 to 15 mm, particularly 3 to 8 mm, and the resulting elongation rate of the width direction WD of the lower waist U is preferably 200 to 350%, particularly 240 to 300%. The spacing of the front-rear direction LD of the lower waist elastic member 15 may be constant, or it may change in the middle of the front-rear direction LD as shown in the illustrated example.

[0062] When the lower waist elastic member 15 is provided in the front-to-back range having an absorbent 56, as in the lower waist portion U of the illustrated example, in order to prevent contraction of the absorbent 56 in the width direction WD in part or all of the portion, the middle of the width direction including part or all of the portion overlapping the absorbent 56 in the width direction WD (preferably including the entirety of the interior fixing portions 201 and 202) is designated as a non-stretchable region A1, and both sides of it in the width direction are designated as stretchable regions A2. It is preferable that the waist portion W is designated as a stretchable region A2 over the entire width direction WD, but similar to the lower waist portion U, a non-stretchable region A1 may be provided in the middle of the width direction.

[0063] Such expandable region A2 and non-expandable region A1 can be constructed during the manufacturing of the outer casings 12F and 12B by fixing the elastic member 15, and then, in the region that will become the non-expandable region A1, cutting the lower waist elastic member 15 at one point in the middle of the width direction by applying pressure and heating, or by cutting it into many small pieces at multiple points, thereby retaining elasticity in the expandable region A2 while eliminating elasticity in the non-expandable region A1. In these cases, cut pieces 16 of the elastic member that do not substantially contribute to expansion and contraction will remain in the non-expandable region A1 within the outer casings 12F and 12B.

[0064] (Laminated structure of the exterior) In the example shown in Figure 5, the waist portion W has an outer portion 18 formed by laminating a first sheet 12S and a second sheet 12H made of nonwoven fabric or the like, and an inner portion 19 formed by folding at least the first sheet 12S inward at the edge We of the waist opening WO. 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 Figure 5, the first sheet 12S and the second sheet 12H of the outer portion 18 extend from the waist portion W to the lower waist portion U (over the entire waist area T in the illustrated example), but is not limited to this, and can be modified as appropriate, such as forming the lower waist portion U with a different sheet. Furthermore, in the front panel F of the example shown in Figure 5, the second sheet 12H is also folded back at the edge of the waist opening WO, forming an inner portion 19 together with the first sheet 12S. The second sheet 12H of the inner portion 19 extends only to the middle of the front-to-back direction LD in the waist portion W, while the first sheet 12S extends from the waist portion W to the lower waist portion U, covering the end of the inner lining 200 on the waist opening WO side. However, this 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 they may extend only to the waist opening WO side of the inner lining 200 and not cover the end of the inner lining 200. Also, similar to the back panel B of the example shown in Figure 5, the second sheet 12H of the front panel F may only exist in the outer portion 18 and not extend to the inner portion 19. Furthermore, unlike the illustrated example, the inner portion 19 does not need to be provided in at least one of the front panel F and the back panel B.

[0065] The materials for the first sheet 12S and the second sheet 12H can be appropriately determined as long as they are nonwoven fabrics. For example, the first sheet 12S and the second sheet 12H can be nonwoven fabrics made of synthetic fibers such as polyethylene, polyolefins such as polypropylene, polyesters, polyamides, or mixed fibers and composite fibers using two or more of these. Examples of fiber bonding methods include the air-through method and the point-bonding method. The fineness, basis weight, and thickness of the nonwoven fabric used for the first sheet 12S and the second sheet 12H can be appropriately determined. For example, the nonwoven fabrics used for the first sheet 12S and the second sheet 12H may have a fineness of 1.0 to 2.5 dtex and a basis weight of 10 to 30 g / m², respectively. 2 Preferably, it is a long-fiber nonwoven fabric with 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 located between the outer portion 18 and the inner portion 19, but it may also be located 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 located between the first sheet 12S and the second sheet 12H, which extend from the outer portion 18, but is not limited to this arrangement and can also be provided between other sheets.

[0068] These elastic members 15 and 17 are fixed to at least one of the first sheet 12S and the second sheet 12H at at least both ends of the expansion / contraction region A2 (i.e., this includes not only structures that fix only both ends in the expansion / contraction direction, but also structures that fix along the entire expansion / contraction direction, and structures that fix intermittently in the expansion / contraction direction). Any known method can be used for this fixing. For example, the elastic members 15 and 17 can be fixed to the first sheet 12S and the second sheet 12H via a hot melt adhesive HM. The waist elastic member 17 in the illustrated example employs this fixing structure. Alternatively, the elastic members 15 and 17 can also 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, which are spaced at intervals narrower than the natural length of the elastic members 15 and 17. In the latter case, the surfaces of the elastic members 15 and 17 can be fixed to at least one of the first sheet 12S and the second sheet 12H along with the formation of the welded portion. Furthermore, along with these, the elastic members 15 and 17 can also be welded to the first sheet 12S and the second sheet 12H along with the welding of 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 8-11, on the back panel B, on the side of the waist opening WO that is closer to the crotch, a dorsal barrier 70 has a portion that rises inward (towards the body surface) and extends in the width direction WD from one side seal 12A to the other side seal 12A. The back barrier 70 has a first portion 71 fixed to the back panel B along its entire width WD, 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 backward. The portion of the back barrier 70 located in the middle of the width WD is a high-rise portion 81 in which the back surface of the second portion 72 and the front surface of the back panel B are not joined together throughout, and the front surface of the second portion 72 and the back surface of the third portion 73 are not joined together throughout. The portions of the back barrier 70 located on both sides 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 and the front surface of the back panel B are joined together throughout, and the front surface of the second portion 72 and the back surface of the third portion 73 are not joined together throughout. Furthermore, an elongated barrier elastic member 74 is attached to at least the rear end of the third portion 73, extending along the width direction WD from one low-rising portion 82 through the high-rising portion 81 to the other low-rising portion 82. The portion of the third portion 73 having the barrier elastic member 74 is elastically contracted in the width direction WD together with the barrier elastic member 74 in its natural length state, and is also elastically expandable in the width direction WD.

[0070] In the figure, the symbol HM1 indicates a hot-melt adhesive for fixing the first part 71 to the back panel B, and the symbol HM2 indicates a hot-melt adhesive for fixing the second part 72 of the low-rise portion 82 to the back panel B. The hot-melt adhesive for fixing the second part 72 of the low-rise portion 82 to the back panel B may be applied over almost the entire back surface of the second part, or it may be applied only to the front end of the back surface of the second part.

[0071] The low-rise portion 82 (the portion fixed with hot-melt adhesive HM2 in the illustrated example) preferably extends over the entire width WD of the region 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 side of the high-rise portion 81 beyond the midpoint of the width WD of the region 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 of the side seal 12A (that is, the back surface of at least the front end of the second portion 72 and the surface of the back panel B may be joined over the entire width 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 WD).

[0072] In these disposable pant-type garments, as shown in Figures 9 to 11, when worn, the third portion 73 of the back barrier 70 rises up to conform to the skin and adheres closely to the skin, thereby suppressing gaps between the back panel B and the body surface and preventing leakage. In particular, as shown in Figures 10 and 11, the back barrier 70 has a high rise-up portion 81 in the middle of the width direction WD where gaps are likely to occur, where the second portion 72 and the third portion 73 rise up (i.e., the height to which they can rise is relatively high), while on both sides, the second portion 72 does not rise up and only the third portion 73 rises up (i.e., the height to which they can rise is low), forming a low rise-up portion 82. The high rise-up portion 81 has excellent leak prevention capabilities due to its high rise-up height, but it is relatively easy to move in. On the other hand, the low rise-up portion 82 has inferior leak prevention capabilities, but its folded state is easily maintained. Therefore, if the entire widthwise WD of the dorsal barrier 70 is a high-rise portion 81, there is a risk that the third portion 73 may partially tilt forward when putting on or wearing the item, worsening the wearing comfort and resulting in an undesirable condition. In contrast, as in this item, if low-rise portions 82 are continuous on both sides of the high-rise portion 81, the folded state of the high-rise portion 81 is maintained by the action of maintaining the folded state of the low-rise portions 82.

[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 B, as shown in the example in Figure 5, or by utilizing the inner portion 19 of the outer casings 12F and 12B, as shown in the example in Figure 12. More specifically, in the back barrier 70 of the example in Figure 5, the first portion 71, second portion 72, and third portion 73 are formed by a barrier sheet 75 that is folded in half with the tip of the third portion 73 as the folding point, creating 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 fixing of the barrier elastic member 74 to the barrier sheet 75 can be appropriately selected, similar to the fixing of the elastic members 15 and 17 of the outer casings 12F and 12B described above, and the same structure as the fixing of the elastic members 15 and 17 of the outer casings 12F and 12B can be adopted, or a different fixing structure can be adopted. 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 at the edge of the waist opening WO together with the outer bodies 12F and 12B and extends to the outer portion 18 of the outer bodies 12F and 12B, but it is not limited to this, and it may extend only to the inner portion 19 of the outer bodies 12F and 12B, or only to the crotch area side beyond the inner portion 19 of the outer bodies 12F and 12B.

[0074] In the structure shown in Figure 12, the inner portions 19 of the outer casings 12F and 12B form a first portion 71, a second portion 72, and a third portion 73. The first sheet 12S forming the inner portions 19 of the outer casings 12F and 12B is folded in half with the tip of the third portion 73 as the folding point, so that the first portion 71, the second portion 72, and the third portion 73 have 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 fixing of the barrier elastic member 74 to the barrier sheet 75 can be appropriately selected in the same way as the fixing of the elastic members 15 and 17 of the outer casings 12F and 12B described above, and the same structure as the fixing of the elastic members 15 and 17 of the outer casings 12F and 12B can be adopted, or a different fixing structure can be adopted. The two-layer structure of the first sheet 12S 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.

[0075] In the third portion 73, it is preferable that several barrier elastic members 74 are provided at intervals in the front-rear direction LD, particularly about 3 to 5 of them. In the second portion 72, elastic members may be provided, but it is preferable that they are not. The barrier elastic members are provided over the entire width of the high-rising portion. On the other hand, the barrier elastic members 74 are provided over most of the low-rising portion 82 on the side of the high-rising portion 81, and may be provided up to the side edge of the low-rising portion 82 (i.e., over the entire width of the dorsal barrier), or they may not be provided up to the side of the low-rising portion 82.

[0076] The dimensions of each part of the dorsal barrier 70 can be determined as appropriate. For example, if the second part 72 is not provided with an elastic member, and the third part 73 is provided with multiple barrier elastic members 74 spaced apart in the front-rear direction LD, it is preferable that the barrier elastic members 74 are not provided within 5 mm of the boundary between the third part 73 and the second part 72. This allows the high-rising portion 81 of the third part 73 to rise more closely to the skin and to make contact with the surface more easily. Furthermore, in this case, the dimension of the front-rear direction LD of the second part 72 is preferably 10 to 30 mm, and the dimension of the front-rear direction LD of the third part 73 is preferably 0.5 to 1.5 times the dimension of the front-rear direction LD of the second part 72. The elongation rate of the third part 73 when the width direction WD is at its maximum elongation is preferably 200 to 300%. Furthermore, it is preferable that the portion of the third section 73 within 5 mm from the rear end (the tip of the dorsal barrier 70) does not have a barrier elastic member 74, and that the layers of the two-layer structure are not joined, because this forms a hollow, flexible portion at the tip of the dorsal barrier 70.

[0077] The positions of each part of the dorsal barrier 70 can 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 56. It is also preferable that the central end of the width direction WD of the low rise portion 82 is located on both ends of the width direction WD of the absorbent 56. If the width of the high rise portion 81 is unnecessarily wide, or if the low rise portion 82, which has the shape-retaining effect of the high rise portion 81, is easily deformed, there is a high risk that the high rise portion 81 will be in an undesirable state due to deformation that occurs during wear. On the other hand, if the low rise portion 82 extends to a part with a relatively rigid absorbent 56, and from there becomes the high rise portion 81, the shape-retaining effect of the low rise portion 82 will be enhanced, and as a result the shape-retaining effect of the high rise portion 81 will also be enhanced.

[0078] If the tightening sensation from the barrier elastic member 74 differs from the tightening sensation from the elastic members 15 and 17 (in the illustrated example, the waist-lower elastic member 15) of the outer casings 12F and 12B located near the front and rear of the barrier elastic member 74, it may cause discomfort. Therefore, in this case, it is preferable that the elastic members 15 and 17 of the barrier elastic member 74 and the outer casings 12F and 12B located near the front and rear of the barrier elastic member 74 are elastic members 15 and 17 of the same thickness and elastic modulus, attached with the same elongation rate, as this reduces the likelihood of such discomfort.

[0079] <Explanation of terms used in the specification> The following terms in this specification shall have the meanings set forth below, unless otherwise specified in this specification.

[0080] "Front-back direction" refers to the direction indicated by the symbol LD in the diagram (vertical direction), and "width direction" refers to the direction indicated by WD in the diagram (left-right direction). The front-back direction and the width direction are orthogonal to each other.

[0081] "Front side" refers to the side that is closer to the wearer's skin when worn, while "back side" refers to the side that is further away from the wearer's skin when worn.

[0082] "Surface" refers to the side of a material that is closer to the wearer's skin when worn, while "back" refers to the side that is further away from the wearer's skin when worn.

[0083] • "Elongation rate" refers to the value relative to the natural length, which is set at 100%. For example, an elongation rate of 200% is equivalent to an elongation ratio of 2.

[0084] "Weight" is measured as follows: After pre-drying the sample or test piece, leave it in a test room or apparatus under standard conditions (temperature 23±1°C, relative humidity 50±2%) to reach a constant weight. Pre-drying means bringing the sample or test piece to a constant weight in an environment of 100°C. Note that pre-drying is not necessary for fibers with an official moisture content of 0.0%. Using a sample-taking template (100mm x 100mm), cut out a sample measuring 100mm x 100mm from the test piece that has reached a constant weight. Measure the weight of the sample, multiply it by 100 to calculate the weight per square meter, and this is the weight.

[0085] • "Thickness" was measured using an automatic thickness measuring instrument (KES-G5 handy compression measurement program) with a load of 0.098 N / cm². 2 , and pressure area: 2cm 2 Automatic measurement is performed under these conditions.

[0086] • Water absorption is measured according to JIS K7223-1996 "Test method for water absorption of superabsorbent polymers".

[0087] "Deployed state" refers to a state in which the body is unfolded flat without any contraction (including contraction due to elastic members, etc.) or slack.

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

[0089] Unless otherwise specified, the tests and measurements shall be conducted in a test room or apparatus under standard conditions (temperature 23±1°C, relative humidity 50±2%). [Industrial applicability]

[0090] This invention can be used for disposable wearable items of the pant type, such as pant-type disposable diapers and pant-type sanitary napkins. [Explanation of Symbols]

[0091] 11…Liquid-impermeable sheet, 12A…Side seal, 12B…Rear outer casing, 12E…Waist extension, 12F,12B…Outer casing, 12F…Front outer casing, 12H…Second sheet, 12S…First sheet, 13…Cover nonwoven fabric, 15,17…Elastic member, 15…Waist lower elastic member, 17…Waist elastic member, 18…Outer part, 19…Inner part, 200…Inner casing, 201,202…Inner casing fixing part, 30…Top sheet, 40…Intermediate sheet, 50…Absorbing element, 56…Absorbing material, 58…Packaging sheet, 60…Upright gather ,60A...tip side portion, 60B...base side portion, 62...gathered nonwoven fabric, 67...fallen 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 rising portion, 82...low rising portion, A1...non-stretchable area, A2...stretchable area, B...back body, C...buttocks cover portion, F...front body, L...intermediate area, LD...front-to-back direction, LO...leg opening, T...waist area, 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 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 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 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:

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 the exterior body adjacent to at least both front and rear sides of the third portion in a longitudinal direction range including the side seal, and the elastic member is attached to the exterior body adjacent to ... 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.

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