TW202045110A - Disposable diaper - Google Patents

Abstract

To provide a disposable diaper intended for wearers particularly associated with high voided volumes. Provided is a disposable diaper in which an absorber 56 chiefly comprising cotton-like pulp and an absorbent element 50 having a high-absorbent polymer are interposed between a liquid-permeable top sheet 30 and a liquid-impermeable sheet 11, wherein: an intermediate sheet 40 having a front end thereof located at a position separated from a ventral-side front end of the absorber 56 by a distance of 5-50 mm toward a crotch side is disposed at least in a front main panel and interposed between the top sheet 30 and the absorbent element 50; and the intermediate sheet 40 is made of an air-through nonwoven cloth having a weight per unit area of at least 30 g/m2 and a thickness of 3-8 mm.

Description

Disposable diapers

The present invention relates to a disposable diaper.

Due to immature bladder development or insufficient nighttime secretion of antidiuretic hormone (which can inhibit the production of urine), even people over 5 years old will experience bedwetting at night (about 800,000 people in Japan). In patients with this type of nocturia, when the cause is insufficient nighttime secretion of antidiuretic hormone, a large amount of urine will accumulate in the bladder at night. With growth, the bladder capacity will increase. Therefore, when the accumulated urine volume exceeds the bladder capacity At times, you will urinate a lot at a time.

Normally, although nocturia patients use night diapers, etc., when urinating, they are sleeping on the stomach. Since the absorbent body can only be used on the front side, the absorption capacity and speed will not keep up with the urination volume and speed, and it is very easy to leak urine. The problem. In response to the above problems, the surface material (top sheet or second sheet) generally uses high diffusive materials such as hot-air non-woven fabrics, or sets slits in the absorber, but when sleeping on your stomach, the urine will not be affected by gravity. It can diffuse toward the back side of the absorber, so it is difficult to obtain the effect of increasing the absorption speed.

In Patent Document 1 (Japanese Patent No. 3949020), for an absorbent article having a thickness of 1.5 mm to 4 mm, an intermediate sheet of 0.8 to 2 mm (so-called second sheet) is used, and the thickness of the intermediate sheet is maximized. In consideration of this structure and the scope of disclosure, it is assumed that the invention of Patent Document 1 is a sanitary napkin.

[Prior Technical Literature] (Patent Document) Patent Document 1: Japanese Patent No. 3949020

[The problem to be solved by the invention] Therefore, the main problem to be solved by the present invention is to provide a disposable diaper, which is particularly suitable for wearers with a large amount of urine. The other problem to be solved is to provide a disposable diaper, which can prevent or suppress urine leakage even if it is assumed to be sleeping on the stomach.

[Technical means to solve the problem] The disposable diapers that solve the above problems are as follows. >Basic Ideas> The basic idea of the present invention is to make the middle sheet (second sheet) fluffy and not easy to flow (that is, easy to retain liquid) in order to prevent leakage or urine leakage when sleeping on the stomach, and configure the middle sheet On the front side of the absorbent body, it can quickly inhale urine (retaining water) and transfer it to the absorbent body directly below, so that it spreads in the absorbent body to make a disposable diaper, which can prevent or inhibit floor leakage when sleeping on your stomach. Pee.

>Basic aspect> Based on related basic ideas, the following basic aspects are provided. A disposable diaper, which has an absorbent member between a liquid-permeable top sheet and a liquid-impermeable sheet. The absorbent member has an absorbent body mainly composed of cotton-like pulp and a super absorbent polymer. The characteristic of the diaper is that the middle sheet is arranged at least on the front body and exists between the top sheet and the absorbent member, and the front end of the middle sheet is located away from the front end of the abdominal side of the absorbent body toward the crotch side. ~50mm; and the aforementioned intermediate sheet is a hot-air nonwoven fabric with a mass per unit area of 30 g/m ² or more and a thickness of 3-8 mm.

As the intermediate sheet, hot-air non-woven fabric is used. The hot-air non-woven fabric is not easy to make liquid flow (easy to retain liquid), so it can quickly inhale urine that has passed through the top sheet 30, inhibit back seepage, and transfer urine to the absorber. In addition, the intermediate sheet has a mass per unit area of 30 g/m ² or more, preferably 30 to 80 g/m ² , and a thickness of 2.5 to 8 mm, preferably 3 to 7 mm, so it is fluffy and does not allow liquid to flow easily. The function of the intermediate film is remarkable.

If the intermediate sheet is bulky (thick), its rigidity can maintain a flat state. Therefore, as shown in the schematic explanatory diagram of FIG. 11, when worn, the absorber 56 in the both side edge portions of the intermediate sheet 40 It is easy to bend, and it is easy to form a space between the top sheet 30 and the top sheet 30. The space can temporarily hold urine (liquid retention), prevent urine overflow, and prevent urine leakage. As shown in the related pattern, the side edges of the intermediate sheet are preferably closer to the central side in the width direction than the side edges of the absorbent body. In addition, if the middle part of the absorbent body in the front-rear direction is further inward in the width direction than the side edges, there are cut parts with cutouts, respectively, and the fit with the wearer can be improved. , Which is narrower than the width of the absorber and straddles the cut portion, has the advantage that it can easily become the state shown in FIG. 11.

Furthermore, the front end position of the intermediate sheet is set at a position 5 to 50 mm away from the ventral front end of the absorbent body toward the crotch side. Assuming that the position of the front end of the middle sheet is consistent with the front end of the ventral side of the absorber, when sleeping on the stomach, the pressure caused by sleeping on the stomach will cause the urine absorbed by the middle sheet to leak out on the front side, causing urine leakage toward the front side. From this viewpoint, the position of the front end of the intermediate sheet is arranged at a predetermined length away from the front end of the ventral side of the absorbent body toward the crotch side, thereby preventing or suppressing urine leakage toward the front side.

The thickness of the absorber is preferably 3 to 10 mm. In order to ensure the amount of absorption, the basis of the mass per unit area is preferably 130 to 250 g/m ² , and particularly preferably 150 to 220 g/m ² .

The disposable diaper may be a shorts-type disposable diaper. For example, it can be a shorts-type disposable diaper, which has: an inner body in which there is an absorbent member between a liquid-permeable top sheet and a liquid-impermeable sheet, and the absorbent member has cotton-like pulp as The absorbent body of the main body and the super absorbent polymer; and, the outer body, which is arranged on the back side of the inner body; the two sides of the outer body are joined together to form the waist opening and the leg opening . In this form, it is preferable to adopt the following structure: in the aforementioned exterior body, a transverse elastic member is provided along the width direction at least at the waist lower part of the front body, and is provided from both sides of the aforementioned exterior body toward the crotch. The side swells and crosses the curved elastic member of the aforementioned intermediate piece. In addition to the transverse elastic member, by bending the elastic member, the intermediate sheet and the absorbent member can be fitted on the wearer's side.

[Effects of the invention] According to the present invention, it is particularly suitable for wearers with a large amount of urination, and is suitable for preventing or suppressing urine leakage. Furthermore, even assuming that it is sleeping on the stomach, urine leakage can be prevented or suppressed.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. >First shorts type disposable diaper> 1 to 6 show an example of the first shorts type disposable diaper 100. The dotted part in the cross-sectional view indicates the adhesive as a joining means for joining the constituent members on the front and back sides. The hot melt adhesive is applied on the entire surface, bead coating, and curtain Curtain coating, key part coating or spiral coating, or pattern coating (transfer of hot-melt adhesive using the relief method), etc., or alternatively or in combination, in the fixed part of the elastic member The upper surface is formed by applying a hot-melt adhesive to the outer peripheral surface of the elastic member by comb gun or Sure Wrap coating or the like. The hot-melt adhesive is not particularly limited. Existing types such as EVA (ethylene-vinyl acetate copolymer), adhesive rubber (elastic system), olefin, polyester, and polyamide can be used. The hot melt adhesive. As a joining means for joining the constituent members, a raw material welding means such as heat sealing and ultrasonic sealing can be used.

The first shorts type disposable diaper 100 includes: a front outer body 12F constituting a front body F; a rear outer body 12B constituting a back body B; and an inner body 200 that passes through the crotch from the front outer body 12F The part extending to the rear exterior body 12B is provided on the inner side of the exterior bodies 12F and 12B, and the two sides of the front exterior body 12F and the both sides of the rear exterior body 12B are joined to form the side seal part 12A, Thus, the openings formed by the front and rear end portions of the exterior bodies 12F, 12B become waist openings WO through which the wearer’s waist passes. Both sides in the width direction of the interior body 200 are defined by the lower edges of the exterior bodies 12F, 12B. The part enclosed with the side edge of the inner body 200 becomes the leg opening LO through which the leg passes with reference to FIG. 6. The inner body 200 is a part that absorbs and holds excrement such as urine, and the outer bodies 12F and 12B are parts for supporting the inner body 200 with respect to the wearer's body. In addition, the symbol Y indicates the full length of the diaper in the unfolded state (the length in the front-rear direction from the edge of the waist opening WO of the front body F with reference to FIG. 6 to the edge of the waist opening WO of the back body B), and the symbol X indicates the diaper in the unfolded state The full width.

In addition, the first shorts-type disposable diaper 100 has a waist area T and a middle area L. The waist area T is determined to have a front-rear direction range of the side seal portion 12A (the front-rear direction from the waist opening WO to the upper end of the leg opening LO Range), the middle area L is determined as the front-rear direction range of the portion forming the leg opening LO (between the front-rear direction area of the front body F with the side seal portion 12A and the back body B) . The waist area T can be conceptually divided into a "waist portion" W forming the edge of the waist opening, and a portion lower than the waist portion, that is, a "waist lower portion" U. Generally, in the case where there is a boundary in the waist area T where the stretching stress in the width direction changes (for example, the thickness and elongation of the elastic member change), the portion closer to the waist opening WO than the boundary closest to the waist opening WO side It becomes the waist W. When there is no such boundary, the part on the waist opening WO side than the absorber 56 or the inner body 200 becomes the waist W. The length in the front-rear direction varies depending on the size of the product and can be appropriately determined. For example, the waist W may be 15-40 mm, and the lower waist U may be 65-120 mm. On the other hand, the edges on both sides of the middle area L are gathered in a U-shape or a curved shape along the circumference of the wearer's legs, and this place is a part for the wearer's legs to extend in. As a result, the shorts-type disposable diaper in the expanded state is formed into a substantially hourglass shape as a whole.

>Inner body 200> The inner body 200 can take any shape, but is rectangular in the illustrated example. As shown in FIGS. 3 to 5, the inner body 200 has: a top sheet 30 on the body side; a liquid-impermeable sheet 11; and an absorbent member 50 interposed between the top sheet 30 and the liquid-impermeable sheet 11 , The inner body 200 is a main body that is responsible for the absorption function. Numeral 40 indicates an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbing member 50 in order to quickly move the liquid that has passed through the top sheet 30 to the absorbing member 50, and numeral 60 indicates to prevent leakage of excrement into the inside. The two sides of the body 200 are provided with three-dimensional pleats 60 standing up toward the body on both sides of the body 200.

The fixing of the inner body 200 to the outer bodies 12F and 12B can be performed by a bonding means based on raw material welding such as heat sealing and ultrasonic sealing, or a hot melt adhesive. In the illustrated form, the back surface of the inner body 200 is opposed to each other through the hot-melt adhesive applied on the back surface of the liquid-impermeable layer 11 and the root portion 65 of the three-dimensional corrugation 60 in this case. Fix to the inner surface of exterior body 12F, 12B. The inner and outer fixing portions 201 for fixing the inner body 200 and the outer body 12F, 12B together can be arranged in almost the entire area where the two overlap, and it is preferable to usually set the inner body 200 and the outer body 12F, 12B in the width direction. At the part other than the end.

(Top piece 30) The top sheet 30 is a liquid-permeable sheet, and for example, a porous or non-porous non-woven fabric, a porous plastic sheet, or the like can be used. In addition, the raw material fibers of the nonwoven fabric are not particularly limited. For example, olefin-based such as polyethylene or polypropylene, synthetic fibers such as polyester-based, polyamide-based, regenerated fibers such as rayon or cupra, natural fibers such as cotton, etc., or the use of two of them The above mixed fiber, composite fiber, etc. In addition, non-woven fabrics can be manufactured by any processing. As a processing method, well-known methods can be illustrated, for example, a spunlace method, a spunbonding method, a hot melt bonding method, a meltblown method, a needle punching method, a hot air method, a point bonding method, and the like. For example, if you want flexibility and drape, spunbonding and spunlace are the better processing methods. If you want fluffiness and flexibility, hot air, spot bonding, and hot melt bonding are the better processing methods. . The most suitable is polypropylene spunbond non-woven fabric.

In addition, the top sheet 30 may be composed of one sheet, or may be composed of a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet in the plane direction, or may be composed of two or more sheets.

When the three-dimensional wrinkles 60 are provided, the two sides of the top sheet 30 can pass between the liquid-impermeable sheet 11 and the three-dimensional wrinkles 60 and fold back to the back side of the absorbent member 50. In order to prevent the penetration of liquid, it is preferably Both sides of the top sheet 30 are joined to the liquid-impermeable sheet 11 and the three-dimensional gathers 60.

For the top sheet 30, for the purpose of preventing positional deviation with respect to the back side member, etc., it is desirable to fix the top sheet 30 to the top sheet 30 by bonding means based on raw material welding such as heat sealing and ultrasonic sealing or hot melt adhesive. On the adjacent member on the back side. In the manner shown in the figure, the top sheet 30 is fixed on the surface of the intermediate sheet 40 and the surface of the portion on the surface side of the absorber 56 in the packaging sheet 58 by the hot melt adhesive applied on the back surface thereof. .

(Intermediate piece 40) In order to make the liquid after passing through the top sheet 30 move to the absorber quickly, an intermediate sheet (also referred to as a "second sheet") 40 having a faster liquid penetration speed than the top sheet 30 may be provided. The intermediate sheet 40 is used for the following purposes: to make the liquid move to the absorber quickly to improve the absorption performance of the absorber, and to prevent the phenomenon of "back-seepage" of the absorbed liquid from the absorber, so that the top sheet 30 can always maintain In a dry state.

As the intermediate sheet 40, the same material as the top sheet 30, or spunlace nonwoven fabric, spunbonded nonwoven fabric, SMS nonwoven fabric, pulp nonwoven fabric, mixed sheet of pulp and rayon, dot bonded nonwoven fabric, or crepe paper can be exemplified. In particular, the hot-air non-woven fabric is bulky, so it is preferable. For the hot-air non-woven 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 is preferably high-stiffness polyester (PET). The mass per unit area is preferably 30 to 80 g/m ² , more preferably 35 to 60 g/m ² . The thickness of the raw material fiber of the non-woven fabric is preferably 2.0 to 10 dtex. In order to make the nonwoven fabric bulky, it is preferable to use eccentric fibers, hollow fibers, or eccentric and hollow fibers whose cores are not in the center as the mixed fibers of all or part of the raw fibers.

The intermediate sheet 40 of the form shown in the figure is shorter than the width of the absorber 56 and is arranged to the center, and it may be provided over the entire width. The length of the intermediate sheet 40 in the longitudinal direction may be the same as the length of the absorber 56 and may be in a short length range centered on the liquid-receiving area, for example, preferably about 40 to 70% of the length of the absorber.

For the intermediate sheet 40, for the purpose of preventing positional deviation with respect to the back side member, etc., it is desirable to fix the intermediate sheet 40 to a bonding method based on raw material welding such as heat sealing and ultrasonic sealing or a hot melt adhesive. On the adjacent member on the back side. In the illustrated form, the intermediate sheet 40 is fixed to the surface of the portion located on the surface side of the absorber 56 in the packaging sheet 58 by the hot melt adhesive applied on the back surface thereof.

According to the aforementioned problem to be solved, the mass per unit area of the intermediate sheet is 30 g/m ² or more, preferably 30 to 80 g/m ² ; and the thickness thereof is 2.5 to 8 mm, preferably 3 to 7 mm. As already explained, if the intermediate sheet is bulky (thick), it is intended to maintain a flat state due to its rigidity. Therefore, as shown in the schematic explanatory diagram of FIG. 11, when worn, it is placed on both sides of the intermediate sheet 40 At the edge portion, the absorber 56 is easy to bend, and it is easy to form a space between the absorbent body 56 and the top sheet 30. The space can temporarily hold urine (liquid retention), prevent urine overflow, and prevent urine leakage. As shown in the related aspect, the side edges of the intermediate sheet are preferably closer to the center side in the width direction than the side edges of the absorbent body. In addition, if the middle part of the absorbent body in the front-rear direction has cut parts that are cut from the side edges toward the inner side in the width direction, the fit with the wearer can be improved; further, if the middle sheet is wider than the absorbent body The width of the intermediate sheet is narrower and the intermediate sheet straddles the cut portion of the absorbent body, which has the advantage that it can easily become the state shown in FIG. 11.

Furthermore, the intermediate sheet 40 is provided at a position separated from the front end of the ventral side of the absorbent body 56 by 5 to 50 mm toward the crotch side. The position of the front end of the intermediate sheet is arranged to be away from the front end of the ventral side of the absorbent body by a predetermined length toward the crotch side, thereby preventing or suppressing leakage of urine toward the front side.

(Impermeable sheet 11) The material of the liquid-impermeable sheet 11 is not particularly limited. For example, plastic films composed of olefin resins such as polyethylene or polypropylene, laminated non-woven fabrics formed by disposing a plastic film on the surface of a non-woven fabric, and plastic films Laminated sheets made of non-woven fabrics, etc. stacked on top of each other and joined. For the liquid-impermeable sheet 11, it is preferable to use a material having liquid-impermeability and moisture permeability, which is preferably used from the viewpoint of preventing stuffiness. As a moisture-permeable plastic film, a microporous plastic film obtained by mixing an olefin resin such as polyethylene or polypropylene with an inorganic filler and forming a sheet, extending in one or two directions, is widely used . In addition, as the liquid-impermeable sheet 11, a sheet that is liquid-impermeable without using a plastic film can also be used. This kind of sheet is liquid-impermeable by the following method: Non-woven fabric of micro denier fibers; enhanced treatment of leak-proof properties by applying heat or pressure to narrow the voids of fibers; and coated with super absorbent resin or hydrophobic resin or water repellent.

The liquid-impermeable sheet 11 is not only formed to be stored in the width of the back side of the absorbent member 50 as shown in the figure, but in order to improve leakage resistance, it may be wound on both sides of the absorbent member 50 and extended to the top of the absorbent member 50. Both sides of the surface of the sheet 30 side. Regarding the width of the extension, it is appropriate that the left and right sides are larger by 5 to 20 mm.

In addition, an excretion indicator can be provided on the inside of the liquid-impermeable sheet 11, especially on the side surface of the absorber 56, which will change color when the liquid component is absorbed.

(Three-dimensional ruffle 60) The three-dimensional wrinkles 60 are belt-shaped members extending in the entire front and rear directions along both sides of the inner body 200, and are arranged to block laterally moving excrement transmitted on the top sheet 30 to prevent side leakage. The three-dimensional gathers 60 of this embodiment are provided so as to stand up from the side of the inner body 200, the root side portion is raised obliquely toward the center side in the width direction, and the portion closer to the tip side than the middle portion toward the outside in the width direction Stand up obliquely.

In more detail, the three-dimensional gathers 60 are formed by folding a band-shaped gather sheet 62 having the same length as the length in the front-rear direction of the inner body 200 in the width direction and folded into two layers, and Between the folded portion and the sheet close to the folded portion, a plurality of elongated corrugated elastic members 63 are fixed in the width direction at intervals in an extended state along the longitudinal direction. The base end portion of the three-dimensional gather 60 on the side opposite to the tip end portion (the end portion on the side opposite to the sheet folded portion in the width direction) is set as a mounting portion 65, which is fixed to the interior The back of the side edge portion of the body 200; the portion other than the mounting portion 65 is set as the protruding portion 66 (the portion on the side of the folded portion) protruding from the mounting portion 65. In addition, the protruding portion 66 is composed of a root-side portion that faces the center side in the width direction, and a tip-side portion that is turned back from the tip of the root-side portion to the outside in the width direction. This form is a surface-contact type three-dimensional gather 60, but it is also possible to adopt a line-contact type three-dimensional gather (not shown) that is not folded outward in the width direction. Furthermore, both ends of the protruding portion 66 in the front-rear direction are set as front-rear fixing portions 67. The front and rear fixing portions 67 are fixed in a fallen state with respect to the side surface of the top sheet 30. On the other hand, the protruding portion 66 The middle portion in the front-rear direction between the front-rear direction ends is set as a non-fixed free portion 68, and the corrugated elastic member 63 along the front-rear direction is fixed to the free portion 68 in an extended state.

In the free portion 68 of the three-dimensional pleats 60, the bonding of the inner layer and the outer layer of the corrugated sheet 62 and the fixing of the corrugated elastic member 63 sandwiched between the inner layer and the outer layer can be achieved by heat fusion At least one of the various application methods of the adhesive and the fixing means of raw material welding such as heat sealing and ultrasonic sealing are performed. Since the entire surface bonding of the inner layer and the outer layer of the corrugated sheet 62 is not conducive to flexibility, the parts other than the adhesive portion of the corrugated elastic member 63 are preferably not bonded or bonded weakly. The structure shown in the figure uses a comb-type spray gun or a rubber band nozzle coating method to apply hot melt adhesive only on the outer peripheral surface of the corrugated elastic member 63 and sandwich the corrugated sheet 62 Between the inner layer and outer layer of the corrugated elastic member 63, only the hot melt adhesive that has been applied to the outer peripheral surface of the corrugated elastic member 63 is used to implement the elongated elastic member relative to the inner layer and the outer layer of the corrugated sheet 62 The fixing, and the fixing between the inner layer and the outer layer of the corrugated sheet 62.

In addition, the fixation of the waterproof membrane 64 and the wrinkle sheet 62 assembled in the three-dimensional gathers 60, or the fixation of the front and rear fixing portions 67 with respect to the side surface of the inner body 200, can also be achieved by various types of hot melt adhesives. At least one of the coating method and the fixing means of the raw material welding such as heat sealing and ultrasonic sealing are performed. In the illustrated form, the waterproof membrane 64 is fixed by slot coating of a hot melt adhesive. In addition, the fixing of the front and rear fixing portions 67 in the illustrated form uses a combination of a hot-melt adhesive and a means based on raw material welding, but these fixings can also be performed by only any one means.

As the corrugated sheet 62, a non-woven fabric that is soft and excellent in uniformity and concealment, such as spunbonded non-woven fabrics (SS, SSS, etc.), SMS non-woven fabrics (SMS, SSMMS, etc.), melt-blown non-woven fabrics, etc., can be suitably used. For those obtained after water-repellent treatment with silica or the like, the mass per unit area of the fiber is preferably about 10 to 30 g/m ² . As the elongated elastic member (corrugated elastic member) 63, a rubber thread or the like can be used. When the elastic fiber rubber thread is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation during fixation is preferably 150-350%, more preferably 200-300%. Moreover, as shown in the figure, the waterproof membrane 64 may be interposed between the corrugated sheets folded into two layers.

The number of the elongated elastic members 63 provided in the free part of the three-dimensional gathers 60 is preferably 2-6, more preferably 3-5. It is appropriate that the arrangement interval 60d is 3 to 10 mm. According to this structure, in the range where the elongated elastic member 63 is arrange|positioned, it becomes easy to contact the skin on a surface. An elongated elastic member 63 may be provided not only on the tip side but also on the root side.

The fixing target of the attachment portion 65 of the three-dimensional gathers 60 can be an appropriate member such as the top sheet 30, the liquid-impermeable sheet 11, and the absorbent member 50 in the inner body 200.

In the three-dimensional wrinkle 60 configured as above, although the contraction force of the elongated elastic member 63 is used to bring the front and rear ends close to each other, the front and rear ends of the protruding portion 66 are fixed so as not to stand upright. In contrast to this, the free part is made as a non-fixed free part between the two ends in the front-rear direction, so only the free part can stand up as shown in FIG. 3 and contact the body side. In particular, if the mounting portion 65 is located on the back side of the inner body 200, the three-dimensional wrinkles 60 stand up so as to open toward the outside in the width direction at the crotch and its vicinity, so the three-dimensional wrinkles 60 will be pressed in a surface manner. Connect around the legs to improve fit.

The size of the three-dimensional gathers 60 can be appropriately determined. In the case of a paper diaper for infants, for example, as shown in FIG. 3, the standing height of the three-dimensional gathers 60 (the widthwise length of the protruding portion 66 in the unfolded state) W6 is preferably 15 ～60mm, particularly preferably 20～40mm. In addition, when the three-dimensional wrinkles 60 are parallel to the surface of the top sheet 30 and folded into a flat state, the separation distance W3 between the folds located on the innermost side is 60 to 190 mm, particularly preferably 70 to 140 mm.

In addition, unlike the illustrated form, the three-dimensional gathers can also be provided in two layers (two rows) on the left and right sides of the inner body 200.

(Absorbing member 50) The absorbent member 50 has an absorbent body 56 and a packaging sheet 58 covering the entire absorbent body 56. The packaging sheet 58 can also be omitted.

(Absorber 56) The absorber 56 may be formed of an aggregate of fibers. As the fiber assembly, in addition to the assembly formed by piling up short fibers such as cotton pulp or synthetic fibers, it is also possible to use tows (fiber bundles) of synthetic fibers such as cellulose acetate as needed. A collection of filaments obtained by spinning. The mass per unit area of the fiber may be, for example, about 100 to 300 g/m ² in the case of piling cotton pulp or short fibers, and in the case of filament aggregates, for example, it may be 30 to 120 g/m2. m ² degree. 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 assembly, the filaments may be non-crimped fibers, but crimped fibers are preferred. The crimp degree of the crimped fiber may be, for example, 5 to 75 per 2.54 cm, preferably 10 to 50, and more preferably about 15 to 50. In addition, crimped fibers crimped uniformly can be used. It is preferable to disperse and maintain superabsorbent polymer particles in the absorber 56.

The absorber 56 may also have a rectangular shape, as shown in Figures 1 and 2, if it is configured to be located at the front end, the rear end and between them, and has a narrower width than the front end and the rear end. The hourglass shape of the part improves the fit of the absorber 56 itself and the three-dimensional folds 60 to the legs and is better.

In addition, the size of the absorber 56 can be appropriately determined as long as it covers the front, rear, left, and right of the urinary opening position, but it is preferable to extend to the periphery of the inner body or its vicinity in the front and rear direction and the width direction. In addition, reference numeral 56X indicates the width of the absorber 56.

The thickness of the absorber is preferably 3 to 10 mm. In order to ensure the amount of absorption, the basis of the mass per unit area is preferably 130 to 250 g/m ² , and particularly preferably 150 to 220 g/m ² .

(Super absorbent polymer particles) A part or all of the absorber 56 may contain superabsorbent polymer particles. Regarding superabsorbent polymer particles, "powder" is included in addition to "particles". As the superabsorbent polymer particles, the particles used in this disposable diaper can be directly used. For example, the particles remain in the sieve during the screening (vibrating for 5 minutes) using a 500 µm standard sieve (JIS Z8801-1: 2006) The proportion of the particles on the upper part is preferably 30% by weight or less. In addition, the proportion of particles remaining on the sieve during the sieving (vibrating for 5 minutes) using a 180µm standard sieve (JIS Z8801-1: 2006) 60% by weight or more of particles is preferable.

As a material of the superabsorbent polymer particles, it can be used without particular limitation, but a material having a water absorption capacity of 40 g/g or more is preferable. As the superabsorbent polymer particles, there are superabsorbent polymer particles such as starch-based, cellulose-based, and synthetic polymer-based particles, and starch-acrylic acid (salt) graft copolymers and saponified starch-acrylonitrile copolymers can be used. , Sodium carboxymethyl cellulose cross-linked product and acrylic acid (salt) polymer and other super absorbent polymer particles. As the shape of the superabsorbent polymer particles, a generally used powder or granular shape is preferred, but other shapes may also be used.

As the superabsorbent polymer particles, it is preferable to use superabsorbent polymer particles having a water absorption speed of 70 seconds or less, particularly 40 seconds or less. If the water absorption speed is too slow, so-called back seepage in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 is likely to occur. As the superabsorbent polymer particles, so-called highly liquid-permeable superabsorbent polymer particles can be suitably used.

The mass per unit area of the superabsorbent polymer particles can be appropriately set in accordance with the amount of absorption required by the use of the absorbent body 56. Therefore, although it cannot be generalized, it can be set to 50 to 350 g/m ² . If the mass per unit area of the polymer is less than 50 g/m ² , it is not easy to ensure the absorption capacity. If the weight per unit area of the polymer exceeds 350 g/m ² , the effect is saturated.

If necessary, the dispersion density or the dispersion amount of the superabsorbent polymer particles can be adjusted in the plane direction of the absorber 56. For example, it is possible to make the amount of dispersion in the excretion site of the liquid larger than the amount of dispersion in other sites. In the case of considering the difference between men and women, in the case of men, the scattering density (amount) on the front side can be increased, and in the case of women, the scattering density (amount) in the center portion can be increased. In addition, it is also possible to provide a portion where the polymer does not exist locally (for example, in a dot shape) in the planar direction of the absorber 56.

(Packaging sheet 58) When the packaging sheet 58 is used, as its raw material, tissue paper, particularly crepe paper, non-woven fabric, composite laminated non-woven fabric, or perforated sheet, can be used. However, it is preferably a sheet in which the superabsorbent polymer particles do not fall out. When a non-woven fabric is used instead of crepe paper, the hydrophilic SMS non-woven fabric (SMS, SSMMS, etc.) is particularly preferred, and the material can be polypropylene, polyethylene/polypropylene composite material, etc. The mass per unit area is preferably 5 to 40 g/m ² , particularly preferably 10 to 30 g/m ² .

The packaging structure of the packaging sheet 58 can be appropriately determined, but from the viewpoints of ease of manufacture and prevention of the leakage of superabsorbent polymer particles from the front and rear edges, the following is preferred: the packaging sheet 58 surrounds the absorbent body 56 The front and back sides and the two sides are wound into a cylindrical shape, and the front and rear edges are exposed from the front and rear of the absorber 56, and the overlapped part and the wound are joined by joining means such as hot melt adhesive and raw material welding. The overlapping parts of the front and rear exposed parts are joined together.

(Exterior body 12F, 12B) The exterior bodies 12F and 12B are composed of the front exterior body 12F, which constitutes the front body F, and the rear exterior body 12B, which constitutes the rear body B. The front exterior body 12F and the rear exterior body 12F 12B, there is no continuity on the crotch side, and is separated in the front and back direction. This separation distance 12d can be set to about 150 to 250 mm, for example. It is preferable to cover a part of the exposed part of the back surface of the inner body 200 in this divided part (for example, over the entire front-to-rear direction of the part exposed between the front outer body 12F and the rear outer body 12B, but It does not extend to the front and rear ends of the inner body 200, and the side edges in the width direction do not reach the extent of the side edges of the inner body 200), or cover the entire body with a crotch cover made of non-woven fabric. The cover piece 12M can also be omitted. In addition, as shown in FIGS. 7 and 8, the exterior body 12 may be formed as an exterior body that extends from the front body F through the crotch and continues to the back body B. In other words, separately constituting the front body F and the back body B outer body 12F, 12B corresponds to the former form; the integrally forming the front body F and the rear body B outer body 12 corresponds to the latter form.

The exterior bodies 12F and 12B have a range in the front-rear direction corresponding to the waist region T, that is, a waist portion. In addition, in the present form, the front exterior body 12F does not have a portion corresponding to the middle region L, but the rear exterior body 12B has the buttocks cover 14 extending from the waist region T to the middle region L side. Although not shown, the front exterior body 12F can also be provided with a groin cover extending from the waist area T to the middle area L side, or it can be provided in a form with only the groin cover and no buttocks cover. It may also be provided that there is no part corresponding to the middle region L on both the front exterior body 12F and the rear exterior body 12B. In addition, in the illustrated form, although the lower edge of the buttocks cover portion 14 is formed linearly along the width direction like the lower edge of the front exterior body 12F, it can also be provided so as to approach the outer side in the width direction. The curve of the waist opening side.

As shown in FIGS. 3 to 5, the exterior bodies 12F and 12B are formed by joining the outer sheet layer 12S and the inner sheet layer 12H by joining means such as hot melt adhesive or welding. The sheet forming the outer sheet layer 12S and the sheet forming the inner sheet layer 12H may be separate sheets in the form shown in FIG. 8 in addition to the common sheet as shown in FIG. 5. That is, in the former case, the inner sheet layer 12H and the outer sheet layer 12H and the outer sheet are separately formed by the inner part and the outer part of a sheet folded at the edge of the waist opening WO (or the edge on the crotch side). Layer 12S. In addition, in the former form, there is an advantage that the number of sheet materials is small; in the latter form, there is an advantage that the inner sheet layer 12H and the outer sheet layer 12S are not easily shifted when they are bonded together.

As the sheet used for the outer sheet layer 12S and the inner sheet layer 12H, although there is no particular limitation in use, a non-woven fabric is preferred. For example, a non-woven fabric composed of the following fibers can be used: olefin-based such as polyethylene or polypropylene Synthetic fibers such as, polyester, polyamide, etc.; or mixed fibers, composite fibers, etc., using two or more of these fibers. Further, the non-woven fabric can be manufactured by any processing. As a processing method, a well-known method can be illustrated, for example, a spunlace method, a spun bond method, a hot melt bonding method, a melt blow method, a needle punch method, a hot air method, a point bonding method, etc. When a non-woven fabric is used, the mass per unit area is preferably about 10-30 g/m ² .

In addition, the mass per unit area of the exterior bodies 12F and 12B is preferably about 20 to 60 g/m ² .

(Stretching area/non-stretching area) Furthermore, in the outer body 12F, 12B, in order to improve the fit for the wearer's waist circumference, between the outer sheet layer 12S and the inner sheet layer 12H, an elongated shape such as a rubber thread is provided along the width direction at the waist lower part. The elastic members (horizontal elastic members) 15-19 are formed with stretchable regions that elastically expand and contract in the width direction as the elastic members expand and contract. In this stretch area, in the natural length state, the outer sheet 12S and the inner sheet 12H shrink with the contraction of the elastic member to form wrinkles or wrinkles. If they stretch in the length direction of the elastic member, the outer sheet The layer 12S and the inner sheet layer 12H can be stretched to a predetermined elongation rate without wrinkles and fully stretched. As the elastic members 15-19, synthetic rubber may be used, or natural rubber may be used. For the bonding of the outer sheet layer 12S and the inner sheet layer 12H in the exterior bodies 12F and 12B, or the fixing of the elongated elastic members 15-19 sandwiched between them, various coatings of hot melt adhesives can be used At least one of the method and the fixing means of raw material welding such as heat sealing or ultrasonic sealing. If the entire surfaces of the exterior bodies 12F and 12B are firmly fixed, it is not good for flexibility. Therefore, it is preferable that the parts other than the bonding parts of the elongated elastic members 15 to 19 are not bonded or bonded weakly. The structure shown in the figure uses a comb-type spray gun or rubber band nozzle coating method to apply hot-melt adhesive only on the outer peripheral surface of the elongated elastic members 15-19 and sandwich the two Between the sheet layers 12S and 12H, the elongated elastic members 15-19 are relative to the two sheets by using only the hot-melt adhesive that has been applied to the outer peripheral surfaces of the elongated elastic members 15-19. Fixing of 12S, 12H, and fixing of two layers 12S, 12H. The elastic members 15 to 19 can be fixed to the outer sheet layer 12S and the inner sheet layer 12H only at both ends in the expansion and contraction direction in the expansion and contraction region.

In more detail, a plurality of waist elastic members 17 are attached to the outer sheet layer 12S and the inner side at the waist W of the exterior bodies 12F and 12B in a manner continuous across the entire width direction WD at intervals in the vertical direction. Between slices 12H. In addition, among the waist elastic members 17, one or more of the elastic members arranged in the area adjacent to the lower waist U may overlap with the inner body 200, or may exclude the ones that overlap with the inner body 200. The central part in the width direction is respectively provided on both sides in the width direction. As this waist elastic member 17, it is preferable to have a thickness of about 3-22 dtex of 155 to 1880 dtex, particularly preferably about 470 to 1240 dtex (this is the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05～1.5mm ² , particularly preferably 0.1～1.0mm ² ) rubber thread, set at an interval of 4-12mm. Based on this setting, the elongation of the waist W in the width direction WD is 150-400%, Preferably, it is about 220 to 320%. In addition, the waist W does not need to be provided with the same thickness of the waist elastic member 17 or the same elongation in the entire front and rear direction. For example, on the upper and lower parts of the waist W, the thickness and elongation of the elastic member 17 It can also be different.

In addition, between the outer sheet layer 12S and the inner sheet layer 12H at the waist lower portion U of the exterior bodies 12F and 12B, a plurality of strips of lower waist elastic members composed of elongated elastic members are installed at intervals in the vertical direction. Components 15,19.

As the lower waist elastic members 15, 19, it is preferable to have a thickness of about 5 to 30 pieces of 155 to 1880 dtex, particularly preferably about 470 to 1240 dtex (this is the case of synthetic rubber. In the case of natural rubber, The rubber thread with a cross-sectional area of 0.05～1.5mm ² , preferably 0.1～1.0mm ² ), should be installed at intervals of 1～15mm, especially 3～8mm. Based on this setting, the lower waist U The elongation in the width direction is 200 to 350%, particularly preferably 240 to 300%.

In addition, between the outer sheet 12S and the inner sheet 12H at the buttocks mask portion 14 of the rear exterior body 12B, a plurality of masks composed of elongated elastic members are installed at intervals in the vertical direction.部flexible member 16.

As the mask portion elastic member 16, it is preferable to have a thickness of about 2 to 10 pieces of 155 to 1880 dtex, particularly preferably about 470 to 1240 dtex (this is the case of synthetic rubber. In the case of natural rubber, the cross-sectional area The rubber thread of 0.05～1.5mm ² , especially 0.1～1.0mm ² ), is arranged at an interval of 5～40mm, particularly preferably an interval of 5～20mm. Based on this arrangement, the mask part is in the width direction The elongation is 150-300%, particularly preferably about 180-260%.

When a groin mask is provided on the front exterior body 12F, a mask elastic member can be provided in the same manner.

As shown by the lower waist portion U and the buttocks mask portion 14 in the illustrated form, when the elastic members 15, 16, 19 are provided in the front and back directions of the absorbent body 56, in order to prevent the The contraction in the width direction of the absorber 56 includes a part or all of the portion overlapping with the absorber 56 in the width direction in the middle of the width direction (preferably including the entire inner and outer fixing portions 201), which is set as non- The expansion and contraction area A1, and both sides in the width direction are set as the expansion and contraction area A2. It is preferable to set the waist W over the entire width direction WD as the stretchable area A2, but like the waist lower portion U, a non-stretchable area may be provided in the middle of the width direction.

(Formation of non-stretching area A1) The stretchable area A2 and the non-stretchable area A1 can be formed by the following method: the elastic members 15-17, 19 are supplied between the inner sheet layer 12H and the outer sheet layer 12S, and the hot melt adhesive is used to bond The elastic members 15, 16, 19 are fixed to at least both ends in the expansion and contraction direction in the expansion and contraction area A2, and the elastic members 15, 16, 19 are not fixed in the area that becomes the non-expandable area A1, and become the non-expansion area A1. In the area in the middle of the width direction, the elastic members 15, 16, 19 are cut by pressing and heating, or almost the elastic members 15, 16, 19 are pressed and heated. The whole is cut finely, thereby maintaining stretchability in the stretchable area A2 and eliminating stretchability in the non-stretchable area A1.

>Second shorts type disposable diaper> The first underpants type disposable diaper shown in FIGS. 1 to 6 has a structure in which an inner body 200 is provided across between the front and rear outer bodies 12F and 12B. Instead of this first shorts-type disposable diaper, a second shorts-type disposable diaper as shown in FIGS. 7 to 10 may be provided with an inner body on the inner side of the outer sheet 12S and the inner sheet 12H that are not divided into front and rear. 200 construction. When the constituent materials of the second underpants-type disposable diaper are substantially the same as those of the first underpants-type disposable diaper, the same reference numerals are assigned and the description is omitted.

In the second shorts type disposable diaper, between the outer sheet layer 12S and the inner sheet layer 12H in the front body F, the side seal portions 12A, 12A on both sides are arranged so as to swell toward the crotch side and are heated by heat The front bending elastic member 70F is fixed by fusion bonding agent. In addition, between the outer sheet layer 12S and the inner sheet layer 12H in the back body B, the side seal portions 12A and 12A on both sides are arranged so as to bulge toward the crotch side and are fixed by a hot melt adhesive. The elastic member 70B is bent back.

Looking at the position of the front curved elastic member 70F in FIG. 7 and the end edge position of the intermediate piece 40 extending toward the crotch side in contrast, the front curved elastic member 70F is arranged to cover the intermediate piece 40 facing the crotch. The shape of the end portion extending laterally crosses the intermediate piece. Therefore, it is preferable to make the intermediate sheet 40 actively contact the wearer's skin to improve the absorption of urine in the intermediate sheet 40.

Furthermore, in the liquid-impermeable sheet 11, for example, a horizontal stripe design is formed at intervals in the front-rear direction of the diaper, and this horizontal stripe design is formed so as to be visually recognized from the outside.

>Others> The above example is an application example to a shorts-type disposable diaper, but it can be applied as a whole to an adhesive-type disposable diaper or a pad-type disposable diaper.

>Explanation of terms in the manual> As long as there is no special description in the specification, the following terms in the specification have the following meanings.

・As shown in the figure, the "front-rear (longitudinal) direction" refers to the direction connecting the abdominal (front) and back (rear) sides, and the "width direction" refers to the direction (left-right direction) orthogonal to the front-rear direction.

・"Elongation" refers to the value when the natural length is set to 100%. For example, the elongation of 200% means the same meaning that the elongation is 2 times.

・"Mass per unit area" is measured as follows. After pre-drying the sample or test piece, place it in a test room or device in a standard state (the temperature of the test site is 23±1°C, and the relative humidity is 50±2%) to make it into a constant state. Pre-drying refers to making the sample or test piece constant in an environment with a temperature of 100°C. In addition, for fibers with a legal moisture content of 0.0%, preliminary drying is not required. Using a template (100mm×100mm) for sample collection, a sample with a size of 100mm×100mm was cut out from the test piece in a constant state. Measure the mass of the sample and multiply it by 100 to calculate the mass per square meter as the mass per unit area.

・"Thickness" is automatically measured with an automatic thickness measuring device (KES-G5 portable compression measurement program) under the conditions of a load of 0.098N/cm ² and a pressurized area of 2cm ² .

・"Water Absorption" is measured according to JIS K7223-1996 "Test Method for Water Absorption of Super Absorbent Resin".

・"Water absorption speed" is the "time to end point" when JIS K 7224-1996 "Test Method for Water Absorption Speed of Super Absorbent Resins" is carried out using 2 g of super absorbent polymer and 50 g of physiological saline.

・"Unfolded state" refers to a state that is flat and unfolded without contraction or slack.

・As long as there is no special description, the size of each part refers to the size in the unfolded state and not in the natural long state.

・In the absence of a description of the environmental conditions in the test or measurement, the test or measurement is performed in a test room or device in a standard state (the temperature of the test site is 23±1°C, the relative humidity is 50±2%) ongoing.

[Industrial availability] The present invention can be applied to the short pants type disposable diapers such as the above-mentioned examples.

11: Liquid-impermeable tablets 12: Exterior body 12A: Side seal 12F: Front exterior body 12B: Rear exterior body 12d: The separation distance between the front exterior body and the rear exterior body 12H: inner layer 12S: Outer layer 12M: Crotch mask 14: buttocks mask 15, 16, 17, 18, 19: elastic member 30: Top piece 40: Intermediate 50: Absorbent member 56: Absorber 56X: the width of the absorber 58: Packaging film 60: Three-dimensional folds 60d: configuration interval 62: Folded sheet 63: Wrinkled elastic member (slender elastic member) 64: waterproof membrane 65: installation part 66: Protruding part 67: front and rear fixed part 68: free part 70F: Front bending elastic member 70B: Back bending elastic member 100: Shorts-type disposable diapers 200: inner body 201: Internal and external fixed part A1: Non-stretching area A2: Telescopic area F: Predecessor B: back T: Waist area W: waist WO: Waist opening LO: leg opening U: Lower waist Y: Full length of the diaper X: the full width of the diaper W3: separation distance W6: Standing height of three-dimensional folds 3-3, 4-4, 5-5, 6-6, 8-8, 9-9, 10-10: cut line

Fig. 1 is a plan view showing the unfolded state of the inner surface of the first underpants type disposable diaper. Fig. 2 is a plan view showing the unfolded state of the outer surface of the shorts-type disposable diaper. Fig. 3 is a sectional view taken along line 3-3 in Fig. 1. Fig. 4 is a sectional view taken along line 4-4 in Fig. 1. Fig. 5(a) is a sectional view taken along line 5-5 in Fig. 1; Fig. 5(b) is a sectional view taken along line 6-6 in Fig. 1. Fig. 6 is a perspective view of a shorts-type disposable diaper. Fig. 7 is a plan view showing the unfolded state of the outer surface of the second underpants type disposable diaper. Fig. 8(a) is a sectional view taken along line 8-8 in Fig. 7; Fig. 8(b) is a sectional view taken along line 9-9 in Fig. 7. Fig. 9 is a plan view of the expanded state viewed from the side of the use surface. Fig. 10 is a cross-sectional view taken along line 10-10 in Fig. 9. Fig. 11 is a transverse cross-sectional view showing the outline of the state of use of the main parts of the diaper.

Domestic hosting information (please note in the order of hosting organization, date and number) no

Foreign hosting information (please note in the order of hosting country, institution, date and number) no

11: Liquid-impermeable tablets

12F: Front exterior body

12B: Rear exterior body

12H: inner layer

12S: Outer layer

15-19: Elastic member

30: Top piece

40: Intermediate

56: Absorber

58: Packaging film

200: inner body

A1: Non-stretching area

A2: Telescopic area

Claims (4)

A disposable diaper, which has an absorbent member between a liquid-permeable top sheet and a liquid-impermeable sheet. The absorbent member has an absorbent body mainly composed of cotton-like pulp and a super absorbent polymer. The characteristic of the diaper is that the middle sheet is arranged at least on the front body and exists between the top sheet and the absorbent member, and the front end of the middle sheet is located away from the front end of the abdominal side of the absorbent body toward the crotch side. ~50mm; and the aforementioned intermediate sheet is a hot-air nonwoven fabric with a mass per unit area of 30 g/m ² or more and a thickness of 3-8 mm. The disposable diaper according to claim 1, wherein the thickness of the absorbent body is 3 to 10 mm. The disposable diaper according to claim 1 or 2, wherein the absorbent body passes through the crotch from the front body and spreads to the back body, and the middle part of the front and rear direction of the absorbent body has a blanket from both side edges toward the inner side in the width direction. The cutting part of the incision; In addition, the width of the intermediate sheet is narrower than the width of the absorber, and the intermediate sheet straddles the cut portion of the absorber. The disposable diaper according to claim 1, which has: an inner body in which there is an absorbent member between the liquid-permeable top sheet and the liquid-impermeable sheet, and the absorbent member has cotton-like pulp as The absorbent body of the main body and the super absorbent polymer; and, the outer body, which is arranged on the back side of the inner body; the two sides of the outer body are joined together to form the waist opening and the leg opening ； In addition, in the exterior body, a transverse elastic member is provided along the width direction at least at the waist lower portion of the front body, and is arranged to bulge from both sides of the exterior body toward the crotch side and cross the middle piece. Elastic member.

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