TW201828904A - Pants-type disposable diaper - Google Patents

Abstract

To improve the visibility of decorative printing without using a dedicated decorative printed sheet. This problem is resolved by providing a front-side outer body (12F) and a back-side outer body (12B), and an inner body (200) which is attached in such a way as to extend from the front-side outer body (12F) to the back-side outer body (12B), and which has a built-in absorption element (50), wherein: at least an intermediate portion in the width direction of the inner body (200) constitutes a part (203) without a liquid impermeable sheet (11) to the outside of the absorption element (50); there is the liquid impermeable sheet (11) comprising a resin film to which decorative printing (27) has been applied, passing to the outside of an outside sheet layer (12S) in the front-side outer body (12F) and the back-side outer body (12B), and covering the entire part of the inner body (200) which does not include the liquid impermeable sheet (11); and the entire outer surface of the liquid impermeable sheet (11) is covered by a cover sheet (13) comprising non-woven fabric.

Description

Shorts type disposable diaper

The present invention relates to a shorts type disposable diaper.

Generally, a shorts-type disposable diaper includes an outer body that separately or integrally forms a front body and a rear body, and an inner body including an absorbent body that is attached to the outside from the front body to the rear body. For the body, both side edges of the outer body of the front body and both side edges of the outer body of the back body are joined together to form a side seal portion, thereby forming a waist opening and a pair of left and right leg openings.

In such a shorts type disposable diaper, in order to improve the fit to the body, the outer body is formed into a laminated structure having a plurality of layers, and various elastic members are installed between the layers in an extended state. Among them, the following structure has a higher fit to the body: it is spaced in the front-rear direction in a waist region defined as a front-rear direction range corresponding to the side seal portion, or an intermediate region between the front-rear waist regions. The elongated elastic members in the width direction are attached at intervals and in a state of being extended in the width direction, respectively (for example, refer to Patent Documents 1 to 5).

On the other hand, a shorts type disposable diaper is known to have a structure in which a decorative print such as a character or a pattern is provided so that it can be visually confirmed from the outer surface of the product. Such decorative printing is performed in addition to a dedicated printing sheet provided between the layers of the exterior body or between the exterior body and the interior body (for example, refer to Patent Documents 1 to 6). The liquid-impermeable sheet covering the back side of the absorbent member is implemented (for example, refer to Patent Documents 7 and 8).

However, in the former case, since the decorative printing is close to the outer surface of the product, it can be visually confirmed more clearly. On the other hand, a dedicated sheet needs to be provided. In contrast, in the latter case, it is not necessary to provide a dedicated sheet, and decorative printing can be provided in a wide range. However, especially in the area that fits the exterior, it is necessary to visually confirm the decoration through multiple sheet layers. Printing, visual confirmation is low.

[Prior Art Literature] (Patent Literature) Patent Literature 1: Japanese Patent Application Laid-Open No. 2004-073428 Patent Literature 2: Japanese Patent Publication No. 2006-525857 Patent Literature 3: Japanese Patent Publication No. 2011-147516 Patent Literature 4: Japan Japanese Patent Application Publication No. 2014-028308 Patent Literature 5: Japanese Patent Publication No. 4964993 Patent Literature 6: Japanese Patent Publication No. 2001-000478 Patent Literature 7: Japanese Patent Publication No. 2001-517098 Patent Literature 8: Japanese Patent Publication No. 2005-315651 Bulletin

[Problems to be Solved by the Invention] Therefore, the main problem to be solved by the present invention is to improve the visual confirmation of decorative printing without using a dedicated decorative printing sheet.

[Technical Means for Solving the Problem] A typical aspect of the present invention that solves the above problems is as follows. <First aspect> A shorts-type disposable diaper comprising: an exterior body constituting at least a waist area of a front body and at least a waist area of a rear body; and an interior body having an absorbent member built in, extending from the front body The rear body is attached to an exterior body, the exterior body includes: an elastic member; an inner sheet layer adjacent to an inner side of the elastic member; and an outer sheet layer adjacent to an outer side of the elastic member; and The two sides of the outer body of the front body and the two sides of the outer body of the back body are respectively joined together to form a waist opening and a pair of left and right leg openings. Features of the shorts type disposable diaper The at least intermediate portion in the width direction of the inner body is a portion that does not have a liquid-impermeable sheet at a position outside the absorbent member, and the shorts-type disposable diaper has a liquid-impermeable material composed of a resin film. The liquid-impermeable sheet passes through a part located outside the outer sheet layer in the exterior body, and covers the entirety of the interior body part without the liquid-impermeable sheet. In the liquid-impermeable tablet Embodiment of the decorative print, and the cover sheet of liquid-impermeable sheet is composed of the entire outer surface of the nonwoven fabric covered.

(Effects and Effects) The first aspect has a feature that a liquid-impermeable sheet conventionally conventionally installed in an inner body is moved to the outer side of the outer body, and the outer side is further covered with a cover sheet to form a product like a cloth. surface. As a result, if a decorative print is provided on the liquid-impermeable sheet, not only a dedicated decorative print sheet is not required, but the decorative print is close to the outer surface of the product, and visual confirmation can be performed more clearly.

<Second aspect> The shorts-type disposable diaper according to the first aspect, wherein both side edges of the cover sheet are located at positions on the center side in the width direction from the positions of both side edges of the absorbent member, and The inner surface of the cover sheet is adhered to the facing surface by a hot-melt adhesive in at least two end portions in a region other than the front and rear end portions thereof.

(Effects) If the side end portion of the cover sheet is located at a portion with low rigidity or is easily deformed, it may peel even if it is adhered to the facing surface. In addition, if the side end portion of the cover sheet is likely to rub against the wearer's legs, there is a higher fear of peeling, and there is also a concern that a poor step may worsen the skin feel. On the other hand, in this second aspect, the side end portion of the cover sheet is located in a region having an absorbing member, that is, a region having higher rigidity than the surroundings, less deformation, and less friction with the wearer's legs. Adhesion to the opposite side is difficult to peel off, and the skin feel is not easily deteriorated. In addition, since the side end portion of the cover sheet is adhered to the facing surface, the boundary is seamlessly integrated without being noticeable.

<Third aspect> The shorts-type disposable diaper according to the second aspect, wherein the inner sheet layer and the outer sheet layer are non-woven fabrics, and the fibers of the inner sheet layer, the outer sheet layer, and the cover sheet are aligned in a width direction.

(Effects) In this way, if the fiber alignment of the inner sheet layer, the outer sheet layer, and the cover sheet is the same in the width direction, the longitudinal and lateral elongation (or aspect ratio of the tensile elongation) is close. Therefore, when using When the deformation occurs in the middle, the inner sheet layer, the outer sheet layer, and the cover sheet can be deformed integrally, and the seams of the cover sheet and the exterior body that are overlapped and adhered are not easy to be noticed, and the side ends of the cover sheet are difficult to peel off.

<Fourth aspect> The shorts type disposable diaper according to any one of the first to third aspects, wherein the cover sheet extends toward the waist opening on at least one of the front body and the back body, and is directed toward the waist opening at the waist opening. The inside of the inner sheet is folded back.

(Effects) The front and rear edges of the cover are not exposed on the outer surface of the product, and the appearance becomes good. In addition, it is difficult for the front and rear edges of the cover sheet to rub against the clothing and peel off.

<Fifth aspect> The shorts type disposable diaper according to any one of the first to fourth aspects, wherein the exterior body has a non-stretchable area provided in a width of an area overlapping the absorbent member. A middle portion in the direction; and a telescopic area provided on both sides in the width direction of the non-stretchable area; and the cover sheet is provided in a width direction range of the non-stretchable area.

(Effects) If the cover sheet is provided in the width direction range of the non-stretchable region in this way, there are fewer wrinkles in the entire cover sheet range, and the appearance is excellent. On the other hand, if the cover sheet extends to the expansion and contraction area, shrinkage wrinkles are also formed on the cover sheet. Therefore, the side ends of the cover sheet are easily peeled off, or the wrinkles are noticeable and have an unnatural appearance.

<Sixth aspect> The shorts type disposable diaper according to any one of the first to fifth aspects, wherein the outer sheet layer is a non-woven fabric, and positions of both edges of the liquid-impermeable sheet and the cover are The positions of the two edges of the sheet are consistent, and the inner surface of the cover sheet is adhered to the liquid-tightness by a hot-melt adhesive in at least both end portions in a region other than its front and rear ends. And the inner surface of the liquid-impermeable sheet is adhered to the exterior body by hot-melt adhesive on at least both end portions in a region other than the front and rear end portions thereof.

(Effects) In this case, both end portions of the cover sheet are adhered to the outer sheet layer made of a non-woven fabric via a liquid-impermeable sheet made of a resin film. The joining of the layers becomes firm.

<Seventh aspect> The shorts-type disposable diaper according to any one of the first to sixth aspects, wherein the shorts-type disposable diaper includes at least a front side outer body and a structure that constitute a front body that is formed separately from each other. At least the rear side exterior body of the rear body is used as the exterior body, and the front side exterior body and the rear side exterior body are separated in the middle of the front-rear direction along the front-rear direction.

(Effects) The position where the front exterior body and the rear exterior body are separated in the front-rear direction corresponds to the supply position of urine, and is an area where leakage resistance is particularly important. In the present invention, although the liquid-impermeable sheet is located on the outside of the exterior body, in such an exterior two-part structure, it is possible to separate the front exterior body and the rear exterior body at positions separated in the front-rear direction. The liquid-impermeable sheet covers the portion of the inner body that does not have the liquid-impermeable sheet without the outer body interposed therebetween. Therefore, urine cannot easily penetrate into the outer body and leak out to the outside. Furthermore, since the cover sheet is provided throughout the front exterior body and the rear exterior body, it has a continuous appearance and skin feel throughout the front exterior body and the rear exterior body. Therefore, the present invention is suitable to be combined with such an exterior two-part structure.

<Eighth aspect> The underpants-type disposable diaper according to any one of the first to seventh aspects, wherein the cover sheet is an apertured non-woven fabric having a plurality of holes passing through the front and back surfaces at intervals.

(Effects and Effects) If the cover sheet is such a perforated nonwoven fabric, not only the air permeability, flexibility, bulkiness (soft feeling), etc. can be improved, but also the decorative printing of the liquid-impermeable sheet can be easily seen.

[Effects of the Invention] As described above, according to the present invention, there is an advantage that the visual confirmation of decorative printing can be improved without using a dedicated decorative printing sheet.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The dotted pattern in the cross-sectional view indicates that the adhesive is used as a bonding means for joining the constituent members on the front side and the back side. The entire surface is applied by hot-melt adhesive, linear coating, curtain, etc. Coating, key part coating or spiral coating, or pattern coating (transfer of hot-melt adhesive by letterpress), or the fixed part of the elastic member is used instead of the adhesive or with This adhesive is formed by coating the outer peripheral surface of the elastic member together with a coating gun or a glue coating. Examples of the hot-melt adhesive include EVA-based, adhesive rubber-based (elastic), olefin-based, and polyester polyamide-based adhesives, and can be used without particular limitation. As a joining means for joining the constituent members, a means based on material welding such as heat sealing or ultrasonic sealing may be adopted.

An example of a shorts type disposable diaper is shown to FIG. 1 thru | or FIG. The shorts-type disposable diaper includes a front outer body 12F constituting at least a waist portion of a front body F, a rear outer body 12B constituting at least a waist portion of a rear body B, and an inner body 200 having an absorbent member 50 built therein. It is installed on the exterior bodies 12F and 12B in such a manner that it extends from the front exterior body 12F through the intermediary part to the rear exterior body 12B. The two sides of the front exterior body 12F and two of the rear exterior body 12B The side portions are joined to form a side seal portion 12A, whereby the openings formed by the front and rear end portions of the exterior bodies 12F and 12B become waist openings WO through which the wearer passes, and both sides of the interior body 200 in the width direction The portions surrounded by the lower edges of the exterior bodies 12F and 12B and the side edges of the interior body 200 are leg openings LO through which the legs pass. The inner body 200 is a part that absorbs and retains feces such as urine, and the outer bodies 12F and 12B are support bodies that support the inner body 200 with respect to the body of the wearer. In addition, the reference numeral Y indicates the full length of the diaper in the unfolded state (the length in the front-rear direction from the edge portion of the waist opening WO of the front body F to the edge portion of the waist opening WO of the rear body B), and the reference numeral X indicates the entire length of the diaper in the extended state width.

The shorts-type disposable diaper of this embodiment has a waist region T and a middle region L, and this waist region T is determined to have a front-to-back direction range having a side seal portion 12A (a front-to-back direction range from the waist opening WO to the upper end of the leg opening LO) The intermediate region L is determined as the range of the front-rear direction of the portion forming the leg opening LO (between the front-rear direction region of the front body F having the side seal portion 12A and the front-rear direction region of the rear body B having the side seal portion 12A). The waistline region T can be conceptually divided into a waist portion W forming an edge portion of the waist opening and a lower waist portion U that is a portion lower than the waist portion W. Generally, when there is a boundary where the stretching stress in the width direction WD changes in the waist region T (for example, the thickness and elongation of the elastic member changes), the boundary closest to the waist opening WO side is closer to the waist opening WO side. The part becomes the waist W, and when there is no such boundary, the side of the waist opening WO that is closer to 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 to 40 mm, and the lower waist U may be 65 to 120 mm. On the other hand, the edges of both sides of the middle region L are folded into a zigzag shape or a curved shape along the periphery of the wearer's legs, and this is a place where the wearer's legs are extended. As a result, the pants-type disposable diaper in the unfolded state is formed into a substantially hourglass shape as a whole.

(Inner Body) The inner body 200 may have any shape, but is rectangular in the form shown in the figure. As shown in FIG. 3 to FIG. 5 (b), the inner body 200 includes an absorbing member 50 and a liquid-permeable top sheet 30 covering the front side of the absorbing member, and the inner body is a main body that performs an absorbing function. Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent member 50 in order to rapidly move the liquid which has passed through the top sheet 30 toward the absorbent member 50, and reference numeral 60 designates to prevent excrement from leaking into the body. The three-dimensional folds 60 protruding from both sides of the body 200 from both sides of the body 200 so as to contact the periphery of the wearer's legs.

(Top Sheet) The top sheet 30 has a property of allowing liquid to pass through, and examples thereof include porous or non-porous nonwoven fabrics, porous plastic sheets, and the like. The raw fiber of the nonwoven fabric is not particularly limited. For example, olefins such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide, synthetic fibers such as rayon or copper ammonia fibers, natural fibers such as cotton, etc., or two or more of them may be used. Mixed fibers, composite fibers, etc. In addition, the nonwoven fabric can be manufactured by any processing. As the processing method, for example, a known method can be exemplified by a spunlace method, a spunbond method, a hot rolling method, a melt-blown method, a needle punch method, a hot air method, and a point bonding method. For example, if flexibility and drapability are pursued, spunbonding and spunlace are preferred processing methods, and if bulkiness and flexibility are pursued, hot air, spot bonding, and hot rolling are preferred processing methods.

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 planar direction, or may be composed of two or more sheets.

Both side portions of the top sheet 30 may be folded back at the side edges of the absorbent member 50, or may be projected laterally than the side edges of the absorbent member 50 without being folded back.

For the top sheet 30, for the purpose of preventing positional deviation from the back-side member, etc., it is desirable to fix the top sheet 30 to On the part adjacent to the back side. In the illustrated embodiment, the top sheet 30 is fixed to the front surface of the middle sheet 40 and the packaging sheet 58 on the front side of the absorbent body 56 by a hot-melt adhesive applied to the back surface thereof. .

(Intermediate Sheet) An intermediate sheet (also referred to as a second sheet) 40 having a liquid transmission rate faster than that of the top sheet 30 may be provided in order to move the liquid that has passed through the top sheet 30 to the absorber quickly. The intermediate sheet 40 is used for the purpose of rapidly moving liquid to the absorbent body to improve the absorption performance of the absorbent body, and to prevent the absorbed liquid from seeping back from the absorbent body. The intermediate sheet 40 may be omitted.

Examples of the intermediate sheet 40 include the same material as the top sheet 30, or a spunlace nonwoven fabric, a spunbond nonwoven fabric, an SMS nonwoven fabric, a pulp nonwoven fabric, a mixed sheet of pulp and rayon, a point-bonded nonwoven fabric, or a crepe paper. In particular, hot air nonwoven fabrics are bulky and therefore preferred. For the hot-air nonwoven fabric, it is preferable to use a composite fiber having a core-sheath structure. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferred. The weight per unit area is preferably 17 to 80 g / m ² , and more preferably 25 to 60 g / m ² . The thickness of the raw fiber of the nonwoven fabric is preferably 2.0 to 10 dtex. In order to bulk the non-woven fabric, it is preferable to use an eccentric core fiber, a hollow fiber, or an eccentric and hollow fiber as the mixed fibers of all or part of the raw fiber.

The intermediate sheet 40 in the form shown is shorter than the width of the absorber 56 and is arranged to the center, and may be provided over the entire width. The length of the intermediate sheet 40 in the front-rear direction may be the same as the total length of the diaper, or may be the same as the length of the absorbent member 50, or may be within a short length range centered on the region receiving the liquid.

For the intermediate sheet 40, it is desirable to fix the intermediate sheet 40 to the intermediate sheet 40 by heat-sealing or ultrasonic sealing based on a material welding method or a hot-melt adhesive for the purpose of preventing positional displacement from the back-side member. On the part adjacent to the back side. In the illustrated embodiment, the intermediate sheet 40 is fixed to the front surface of the portion of the packaging sheet 58 located on the front side of the absorbent body 56 by a hot-melt adhesive applied to the back surface thereof.

(Three-dimensional pleated portion) The three-dimensional pleated portion 60 extends along the entire side of the inner body 200 along the entire front-rear direction LD, stands from the side of the inner body 200 to the front side, and surrounds the wearer's legs Contact to prevent side leakage.

Regarding the three-dimensional pleated portion 60 of this aspect, the root-side portion 60B stands obliquely toward the center in the width direction, and the portion 60A on the distal side than the middle portion stands obliquely toward the outside in the width direction. However, the three-dimensional pleated portion is not limited to this. It is also possible to appropriately change the manner in which the entire structure rises toward the center in the width direction. To explain in more detail, the three-dimensional pleated portion 60 of the present embodiment is configured as follows: a belt-shaped pleated portion nonwoven fabric 62 having a length equal to the length in the front-rear direction of the inner body 200 has a width at the end portion. It is folded back in the direction WD to be folded into two parts, and a plurality of elongated wrinkles are elastically fixed in the widthwise direction WD at intervals between the folded-back part and the sheet in the vicinity thereof. Part 63. The base end portion (the end portion on the side opposite to the sheet folded-back portion in the width direction WD) of the three-dimensional wrinkle portion 60 on the side opposite to the end portion is a side portion fixed on the back side of the inner body 200. The upper root portion 65, and the portion other than the root portion 65 is a main body portion 66 (a portion on the side of the folded-back portion) protruding from the root portion 65. In addition, the main body portion 66 includes a root-side portion 60B that extends toward the center in the width direction, and a tip-side portion 60A that is folded back at the end of the root-side portion 60B and extends outward in the width direction. This embodiment is a three-dimensional wrinkle portion 60 of a surface contact type, but a three-dimensional wrinkle portion 60 of a line contact type that does not fold back in the width direction outside may be used. Further, both ends of the main body portion 66 in the front-rear direction are lodging portions 67 which are fixed with respect to the side surface of the top sheet 30 in an inverted state, and the middle portion in the front-rear direction between them is not fixed freely. The portion 68 is fixed to at least a distal end portion of the free portion 68 in a stretched state with the wrinkle portion elastic member 63 along the front-rear direction LD.

In the three-dimensional pleated portion 60 configured as described above, the contraction force of the pleated portion elastic member 63 acts to bring the both ends in the front-rear direction closer, but the ends in the front-rear direction in the main body portion 66 do not stand up. As opposed to this, an unfixed free portion 68 is formed between the two end portions. Therefore, as shown in FIG. 3, only the free portion 68 stands up to abut the body side. In particular, if the root portion 65 is located on the back side of the inner body 200, the free portion 68 is erected in the intercondylar portion and its vicinity so as to spread outward in the width direction, so that the three-dimensional fold portion 60 abuts on the surface. Around the legs for improved fit.

As the wrinkle portion nonwoven fabric 62, those which are excellent in softness, uniformity, and concealment, such as spunbond nonwoven fabrics (SS, SSS, etc.), SMS nonwoven fabrics (SMS, SSMMS, etc.), meltblown nonwoven fabrics, etc., as required, can be suitably used as needed. It is preferable that the weight per unit area of the pleated nonwoven fabric obtained by subjecting the nonwoven fabric to a hydrophobic treatment is about 10 to 30 g / m ² . As the corrugated portion elastic member 63, a rubber thread or the like can be used. When a spandex rubber thread is used, the thickness is preferably 470 to 1240 dtex, and more preferably 620 to 940 dtex. The elongation at the time of fixing is preferably 150 to 350%, and more preferably 200 to 300%. The term "elongation" means a value when the natural length is 100%. In addition, as shown in the figure, the waterproof membrane 64 may be interposed between the pleated nonwoven fabric 62 folded in two parts. In this case, the pleated nonwoven fabric may be partially omitted at the portion where the waterproof membrane 64 is present. 62. However, in order to form the appearance of the product and the feel of the skin like a cloth, it is necessary to form at least the outer surface from the base end to the end of the three-dimensional wrinkle portion 60 by the wrinkle portion nonwoven fabric 62 as shown in the figure.

In the three-dimensional pleated portion 60 of the present embodiment, the main body portion 66 is composed of a root-side portion 60B extending toward the center in the width direction and a terminal-side portion 60A folded back at the end of the root-side portion 60B to extend outward in the width direction. In the curved form, at the lodging portion 67, the tip-side portion 60A and the root-side portion 60B are joined together in the lodging state, and the root-side portion 60B is joined to the top sheet 30 in the lodging state. For joining the facing surfaces in the lodging portion 67, at least one of a hot-melt adhesive based on various coating methods, and a material-based welding method such as heat sealing or ultrasonic sealing can be used. In this case, the joining of the root-side portion 60B and the top sheet 30 and the joining of the distal-side portion 60A and the root-side portion 60B may be performed by the same means, or may be performed by different means. For example, a preferred method is to join the root-side portion 60B and the top sheet 30 by a hot-melt adhesive, and to bond the end-side portion 60A and the root-side portion 60B by material welding.

The number of pleated portion elastic members 63 provided in the free portion of the three-dimensional pleated portion 60 is preferably 2 to 6, and more preferably 3 to 5. The arrangement interval 60d is preferably 3 to 10 mm. If comprised in this way, it will become easy to surface-contact skin in the range in which the wrinkle part elastic member 63 was arrange | positioned. The corrugated portion elastic member 63 may be arranged not only on the distal end side but also on the root side.

At the free portion 68 of the three-dimensional wrinkle portion 60, various applications can be applied to the bonding of the inner layer and the outer layer of the wrinkle portion nonwoven fabric 62 or the fixing of the wrinkle portion elastic member 63 sandwiched between them. At least one of a method such as a hot-melt adhesive, and a heat-sealing or ultrasonic sealing-based fixing means based on material welding. If the inner layer and the outer layer of the wrinkle portion nonwoven fabric 62 are bonded together over the entire surface, the flexibility is impaired. Therefore, it is preferable not to adhere or weakly adhere to the portion other than the adhesive portion of the wrinkle portion elastic member 63. . The method shown in the figure has a structure in which a hot-melt adhesive is applied to only the outer peripheral surface of the wrinkle portion elastic member 63 by applying means such as a coating gun or a glue nozzle, and the wrinkle portion is elasticized. The member 63 is sandwiched between the inner layer and the outer layer of the wrinkle-section nonwoven fabric 62, and thus the wrinkle-section elastic member is made of only the hot-melt adhesive applied to the outer peripheral surface of the wrinkle-section elastic member 63. 63 is fixed to the inner and outer layers of the pleated nonwoven fabric 62 and the fixation between the inner and outer layers of the pleated nonwoven fabric 62.

Similarly, for fixing the waterproof film 64 and the pleated portion nonwoven fabric 62 or the lodging portion 67 incorporated in the three-dimensional pleated portion 60, a hot-melt adhesive based on various coating methods, and heat-sealing or super At least one of methods based on material welding, such as sonic sealing.

The size of the three-dimensional wrinkle portion 60 in this embodiment can be appropriately determined, but in the case of a diaper for an infant, for example, as shown in FIG. 3, the rising height of the three-dimensional wrinkle portion 60 (the width of the main body portion 66 in the unfolded state) Directional length) W2 is preferably 15 to 60 mm, and particularly preferably 20 to 40 mm. The separation distance W1 between the innermost fold lines in a state where the three-dimensional pleated portion 60 is flatly folded parallel to the front surface of the top sheet 30 is preferably 60 to 190 mm, and particularly preferably 70 to 140 mm.

(Absorbent Member) The absorbent member 50 includes an absorber 56 and a packaging sheet 58 that covers the entire absorber 56. When the shape retention of the absorbent body 56 is excellent, the packaging sheet 58 may be omitted as necessary.

(Absorbent Body) The absorbent body 56 may be formed of an aggregate of fibers. As the fiber aggregate, in addition to an aggregate obtained by accumulating short fibers such as cotton pulp or synthetic fibers, a tow (fiber bundle) of synthetic fibers such as cellulose acetate may be used as needed. A filament assembly obtained from fibers. The weight per unit area of the fiber may be, for example, about 100 to 300 g / m ² when the cotton pulp or short fibers are accumulated, and in the case of a filament aggregate, for example, about 30 to 120 g. / m ² . The fineness in the case of a synthetic fiber 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 filament may be a non-crimped fiber, but is preferably a crimped fiber. 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 approximately 15 to 50. In addition, crimped fibers that are uniformly crimped are used in many cases. It is preferable to disperse and hold the superabsorbent polymer particles in the absorber 56.

The absorbent body 56 may have a rectangular shape, but as shown in FIG. 1 and FIG. 7 and the like, an hourglass shape having a narrowed portion 56N having a width narrower than the front and back sides in the middle of the front-to-rear direction is provided. The absorbent body 56 and the three-dimensional pleated portion 60 are preferable in terms of their fit to the surroundings of the legs.

In addition, the size of the absorbent body 56 may be appropriately determined as long as it covers the front, back, left, and right sides of the urination opening position. However, it is preferable that the size of the absorbent body 56 extends to or near the peripheral edge portion of the inner body 200 in the front-back direction LD and the width direction WD. Reference numeral 56X indicates the full width of the absorber 56.

(Super Absorbent Polymer Particles) Part or all of the absorber 56 may contain super absorbent polymer particles. The superabsorbent polymer particles include "powder" in addition to "particles". As the superabsorbent polymer particle 54, a superabsorbent polymer particle used in such an absorbent article can be used as it is. The particle diameter of the superabsorbent polymer particles is not particularly limited, but it is desirable that the particle diameter is such that, for example, a sieve using a standard 500 μm sieve (JIS Z 8801-1: 2006) (vibrating sieve for 5 minutes) is performed. The proportion of particles remaining on the 500 μm standard sieve when the screen (5 minute shaker) using a 180 μm standard sieve (JIS Z 8801-1: 2006) was performed on the particles that fell below the sieve during the above screening. It is 30% by weight or less, and the proportion of particles remaining on a standard sieve of 180 μm is 60% by weight or more.

The material for the superabsorbent polymer particles can be used without particular limitation, but a material having a water absorption of 40 g / g or more is preferable. Examples of the superabsorbent polymer particles include superabsorbent polymer particles such as starches, celluloses, and synthetic polymers. Saponification products of starch-acrylic acid (salt) graft polymers and starch-acrylonitrile copolymers can be used. , Carboxymethylcellulose sodium cross-linked product and acrylic (salt) polymer and other superabsorbent polymer particles. The shape of the superabsorbent polymer particles is preferably a powder or granular shape that is generally used, but other shapes may be used.

As the superabsorbent polymer particles, it is preferred 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, the so-called back osmosis in which the liquid supplied into the absorbent body 56 returns to the outside of the absorbent body 56 easily occurs.

As the superabsorbent polymer particle, it is preferable to use a superabsorbent polymer particle having a gel strength of 1,000 Pa or more. Thereby, even when it is formed as the bulky absorbent body 56, the sticky feeling after liquid absorption can be effectively suppressed.

The weight per unit area of the superabsorbent polymer particles can be appropriately determined in accordance with the amount of absorption required for the use of the absorbent body 56. Therefore, it cannot be generalized, but it can be 50 to 350 g / m ² . When the weight per unit area of the polymer is less than 50 g / m ² , it is difficult to secure the absorption amount. When the weight per unit area of the polymer exceeds 350 g / m ² , the effect is saturated.

(Packaging Sheet) When the packaging sheet 58 is used, as its material, tissue paper, in particular, crepe paper, nonwoven fabric, composite laminated nonwoven fabric, a sheet with small holes, and the like can be used. However, a sheet in which the superabsorbent polymer particles do not come out is desired. When a non-woven fabric is used instead of a crepe paper, a hydrophilic SMS non-woven fabric (SMS, SSMMS, etc.) is particularly preferable, and the material can be polypropylene, polyethylene / polypropylene composite material, or the like. The weight per unit area is desirably 5 to 40 g / m ² , and particularly preferably 10 to 30 g / m ² .

The packaging method of the packaging sheet 58 can be appropriately determined, but from the viewpoints of ease of production and prevention of leakage of the superabsorbent polymer particles from the front and rear edges, it is preferable that the packaging sheet 58 surrounds the front surface of the absorbent body 56. And the back and the two sides are wound into a cylindrical shape, and the front and rear edge portions are exposed from the front and back of the absorbent body 56. The overlapping parts and the front and back are exposed by using a bonding means such as hot-melt adhesive and material welding. The overlapping parts are joined together.

(Part without liquid-impermeable sheet) As shown in FIGS. 3 to 5 (b), at least the middle portion in the width direction of the inner body 200 does not have a liquid-impermeable sheet at a position outside the absorption member 50. Part 11 of 203. That is, in the present embodiment, the liquid-impermeable sheet 11 that has been conventionally provided in the inner body 200 to prevent bleeding to the back side is not provided in the inner body 200. Further, in this embodiment, since the waterproof film 64 built in the three-dimensional pleated portion 60 extends to the back side of the absorbing member 50 in both ends in the width direction of the inner body 200, both ends in the width direction have The portion of the liquid-impermeable sheet 11 may have a form in which the waterproof film 64 does not exist in the three-dimensional pleated portion 60 or a form in which the waterproof film does not extend to the back side of the inner body 200. In this case, The entire width direction of the inner body 200 is a portion that does not include the liquid-impermeable sheet 11 at a position outside the absorption member 50. In addition, a water-repellent film other than the water-repellent film 64 of the three-dimensional pleated portion 60 may be provided on the outer side of the absorbing member 50 in both ends of the width direction WD of the inner body 200.

(Exterior Body) The exterior bodies 12F and 12B are composed of a front exterior body 12F that constitutes at least a waistline portion of the front body F, and a rear exterior body 12B that constitutes at least a waistline portion of the rear body B. The body 12F and the rear exterior body 12B are discontinuous on the intercondylar side and are separated in the front-back direction LD. The separation distance 12d may be, for example, about 150 to 250 mm. In addition, as shown in FIG. 12 to FIG. 13 (b), the exterior body 12 may be an integral exterior body (exterior-integrated type) that is continuous from the front body F through the chin to the rear body B.

The exterior bodies 12F and 12B have a waistline portion which is a front-rear direction range corresponding to the waistline region T. In addition, in this embodiment, the size of the front exterior body 12B in the front-back direction is longer than that of the front exterior body 12F. The front exterior body 12F does not have a portion corresponding to the middle region L, but the rear exterior body 12B It has a hip cover part C which protrudes from the waist area T to the middle area L side. Although it is not shown in the figure, the front outer body 12F may be provided with a groin cover portion extending from the waist area T to the middle area L side, or a groin cover portion may be provided without a hip cover portion, or The portions corresponding to the middle region L may not be provided on both the front exterior body 12F and the rear exterior body 12B. In addition, although the lower edge of the hip cover portion C is formed in a straight line in the width direction WD in the same manner as the lower edge of the front-side exterior body 12F in the illustrated embodiment, it may be closer to the waist opening side as it goes outward in the width direction. The curve.

As shown in Fig. 4 to Fig. 5 (b), the outer bodies 12F and 12B are formed by bonding the outer sheet layers 12S and 12S on the outer side and the inner side of the elastic members 15 to 19 which will be described later by bonding means such as hot-melt adhesive or welding. The inner sheet layer 12H is joined. The sheet forming the outer sheet layer 12S and the sheet forming the inner sheet layer 12H may be a common sheet, or may be separate sheets. That is, in the former case, the inner and outer portions of a sheet are folded back at the edge of the waist opening WO (or at the edge of the intercondylar side) on part or all of the exterior body, respectively, to form the inside. The sheet layer 12H and the outer sheet layer 12S. Further, in the former method, there is an advantage that the number of sheets is small, and in the latter method, there is an advantage that positional displacement is difficult to occur when the inner sheet layer 12H and the outer sheet layer 12S are bonded. The method shown in the figure corresponds to the latter. The sheet forming the inner sheet 12H extends only to the edge of the waist opening WO, but the sheet forming the outer sheet 12S bypasses the waist-side edge of the sheet of the inner sheet 12H backward. The inside is folded back, and the folded-back portion 12r extends so as to cover the waist-side end of the inner body 200.

The sheets used for the outer sheet layer 12S and the inner sheet layer 12H can be used without particular limitation, but a non-woven fabric is preferable. For example, the following non-woven fabrics can be used. The non-woven fabrics are made of olefins such as polyethylene or polypropylene, and polyesters. Based, synthetic fibers such as polyamide, or mixed fibers or composite fibers using two or more of them. In addition, the nonwoven fabric can be manufactured by any processing. As the processing method, for example, a known method can be exemplified by a spunlace method, a spunbond method, a hot rolling method, a melt-blown method, a needle punch method, a hot air method, and a point bonding method. When a nonwoven fabric is used, the weight per unit area is preferably about 10 to 30 g / m ² . The thickness of the non-woven fabric for the outer sheet layer 12S and the non-woven fabric for the inner sheet layer 12H is preferably 0.1 to 0.5 mm, respectively.

In addition, it is preferable that the total weight per unit area (the sum of the weight per unit area of the outer sheet layer 12S and the weight per unit area of the inner sheet layer 12H) of the nonwoven fabric used for the exterior bodies 12F and 12B is approximately 20 to 60 g. / m ² .

(Stretchable and non-stretchable regions) In order to improve the fit to the wearer's waist on the exterior bodies 12F and 12B, it is preferable to provide elastic members 15 to 19 between the outer sheet layer 12S and the inner sheet layer 12H. As a result, a stretchable region A2 that is elastically stretched in the width direction WD as the elastic members 15 to 19 are stretched and contracted is formed. In this stretched area A2, in a state of natural length, the outer sheet layer 12S and the inner sheet layer 12H shrink as the elastic member shrinks, thereby forming wrinkles or creases. When the outer sheet layer 12S and the inner sheet layer 12H are formed, When the elastic member is stretched in the longitudinal direction, it can be stretched to a predetermined elongation rate such that it is stretched to the limit without wrinkles. As the elastic members 15 to 19, well-known elastic members such as a belt, a net, and a film may be used without particular limitation in addition to the elongated elastic members (examples of the drawings) such as rubber threads. As the elastic members 15 to 19, synthetic rubber 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 elastic members 15 to 19 sandwiched between them, a hot-melt adhesive based on various coating methods can be used. And at least one of fixing means based on material welding such as heat sealing or ultrasonic sealing. If the entire surfaces of the exterior bodies 12F and 12B are firmly fixed, the flexibility is impaired. Therefore, it is preferable that portions other than the adhesion portions of the elastic members 15 to 19 are not adhered or weakly adhered. The method shown in the figure has a structure in which a hot-melt adhesive is applied to only the outer peripheral surfaces of the elastic members 15 to 19 by a coating means such as a coating gun or a gluing nozzle and sandwiched between the two sheet layers 12S, Between 12H, the fixing of the elastic members 15 to 19 to the two sheet layers 12S and 12H and the two sheet layers 12S and 12H using only the hot-melt adhesive applied to the outer peripheral surfaces of the elastic members 15 to 19 are performed. Fixing between sheet layers 12S, 12H. The elastic members 15 to 19 may be fixed to the outer sheet layer 12S and the inner sheet layer 12H only at both ends in the telescopic direction in the telescopic area.

The elastic members 15 to 19 shown in the drawings will be described in more detail. The plurality of waist elastic members 17 are attached to the waist portions of the exterior bodies 12F and 12B at intervals in the front-rear direction so as to be continuous throughout the entire width direction WD. Between the outer sheet layer 12S and the inner sheet layer 12H at W. In addition, one or more of the waist elastic members 17 disposed in a region adjacent to the lower waist portion U may overlap the inner body 200 or may remove the width overlapping the inner body 200. The central portion is provided on both sides in the width direction. As the waist elastic member 17, it is preferable to provide approximately 3 to 22 pieces of 155 to 1880 dtex at a distance of 4 to 12 mm, and particularly preferably approximately 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, cut The rubber thread having an area of 0.05 to 1.5 mm ² , particularly preferably about 0.1 to 1.0 mm ² ), based on this setting, the elongation of the waist W in the width direction WD is preferably 150 to 400%, and particularly preferably about 220 to 320%. In addition, for the waist W, it is not necessary to use the same thickness of the waist elastic members 17 in the front-rear direction LD or to provide the same elongation. For example, the thickness or the elongation of the elastic members 17 may be different at the upper and lower portions of the waist W.

In addition, a plurality of lower waist elastic members made of elongated elastic members are attached between the outer sheet layer 12S and the inner sheet layer 12H at the lower waist portion U of the exterior bodies 12F and 12B at intervals in the front-rear direction. 15, 19.

As the lower waist elastic members 15 and 19, it is preferable to provide approximately 5 to 30 pieces with a thickness of 155 to 1880 dtex at 1 to 15 mm, particularly preferably at intervals of 3 to 8 mm, and particularly preferably approximately 470 to 1240 dtex (in the case of synthetic rubber). In the case of natural rubber, a rubber thread having a cross-sectional area of 0.05 to 1.5 mm ² , particularly preferably about 0.1 to 1.0 mm ² ), based on the elongation of the lower waist portion U in the width direction WD, is preferably 200 to 350%, particularly preferably about 240 to 300%.

Further, between the outer sheet layer 12S and the inner sheet layer 12H in the hip cover portion C of the rear exterior body 12B, a cover portion elastic member 16 made of an elongated elastic member is attached.

As the cover portion elastic member 16, it is preferable to provide one or a plurality of 155 to 1880 dtex at a distance of 155 to 1880 dtex, and particularly preferably about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber). (The cross-sectional area is 0.05 to 1.5 mm ² , particularly preferably about 0.1 to 1.0 mm ² ). Based on the provided elongation of the hip cover portion C in the width direction WD, it is preferably 150 to 300%, and particularly preferably It is 180 to 260%.

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

When the elastic members 15, 16, 19 are provided in the front-rear direction range having the absorbent body 56 as in the lower waist portion U or the hip cover portion C of the embodiment shown in FIG. 2 or the like, in order to cover part or all of the range The shrinkage of the absorbent body 56 in the width direction WD is prevented, and the middle of the width direction (preferably including the entirety of the inner and outer joint portions 201 and 202) including a part or all of the portion overlapping the absorbent body 56 in the width direction WD is set to The non-stretchable area A1 is set as the stretchable area A2 on both sides in the width direction. It is preferable to set the waist W to the entire width direction WD as the stretchable area A2, but a non-stretchable area A1 may be provided in the middle of the width direction similarly to the lower waist portion U. Of course, as in the form shown in FIG. 11, the non-stretchable region A1 may not be provided without cutting the elastic member.

Such a stretchable region A2 and a non-stretchable region A1 can be formed by supplying elastic members 15 to 17, 19 between the inner sheet layer 12H and the outer sheet layer 12S in at least the telescopic direction in the stretchable region A2. At both ends, the elastic members 15, 16, 19 are fixed with a hot-melt adhesive. In the area that becomes the non-stretchable area A1, the elastic members 15, 16, 19 are not fixed, and in the area that becomes the non-stretchable area A1. , At a part in the middle of the width direction, the elastic members 15, 16, 19 are cut by pressing and heating, or almost all of the elastic members 15, 16, 19 are cut by fine and heating, so that Scalability is retained in the stretchable area A2, while scalability is eliminated in the non-stretchable area A1. In the former case, as shown in FIG. 4, in the non-stretchable area A1, the remaining portion after being cut continuously with the elastic members 15, 16, 19 of the stretchable area A2 is contracted as a redundant elastic member 18 to a natural length alone. It remains between the outer sheet layer 12S and the inner sheet layer 12H in the state. In the latter case, although not shown, the remaining parts after being cut off continuously with the elastic members 15, 16, 19 of the stretchable area A2, and The cut pieces of the elastic members that are continuous with the elastic members 15, 16, and 19 of the two stretchable regions A2 are left as extra elastic members, and are left between the outer sheet layer 12S and the inner sheet layer 12H when they are contracted to a natural length.

(Internal and External Joints) The fixing of the inner body 200 to the outer bodies 12F and 12B can be performed by a material welding method such as heat sealing or ultrasonic sealing, or a hot-melt adhesive. The inner and outer joint portions 201 and 202 that fix the inner body 200 and the outer bodies 12F and 12B together can be provided in almost the entire area where the two overlap. Outside the Ministry.

(Liquid-impermeable sheet) As shown in FIG. 21 (b), a liquid-impermeable sheet 11 made of a resin film is provided. The liquid-impermeable sheet 11 passes through the outer casings 12F and 12B. The outer sheet portion 12S in the middle covers the entire portion 203 of the inner body 200 that does not have the liquid-impermeable sheet 11. This aspect is different from the conventional aspect which has the liquid-impermeable sheet 11 inside the exterior bodies 12F and 12B like FIG. 21 (a). The liquid-impermeable sheet 11 is a decorative printed sheet to which a decorative print 27 is applied as shown in FIGS. 2 and 7. Alternatively, the decorative sheet may include a sheet dedicated to decoration without providing a decorative printed sheet.

As for the liquid-impermeable sheet 11, as long as it can cover the entire portion 203 of the inner body 200 without the liquid-impermeable sheet 11, the size and position in the front-rear direction and the width direction can be appropriately determined. Generally, when the liquid-impermeable sheet 11 is a two-part type, it is preferable that the inner body 200 has the narrowest width as shown in FIG. 8 (in the case of the illustrated form, it is the inner body). 200 full width 200x) The liquid-impermeable sheet is provided with a narrower full width 11x in the width direction range. In the case of an exterior-integrated type, it is preferable that the exterior body 12 and the interior body be as shown in FIG. 12. The narrowest part of 200 has the larger width (the outer body 12 in the illustrated form) in the width direction of the narrowest part, and is provided with a narrower full width 11x. sheet. The full width 11x of the liquid-impermeable sheet 11 is preferably 10 mm or more larger than the full width of the portion 203 of the inner body 200 that does not have the liquid-impermeable sheet 11. In particular, in order to improve the leakproofness, when the three-dimensional wrinkle portion 60 has a root portion 65 fixed to a side portion on the back side of the inner body 200, it is preferable that the root portion 65 and the liquid-impermeable property The sheet 11 has an overlapping portion of 5 mm or more in the width direction. Furthermore, as shown in the figure, in the form in which the three-dimensional wrinkle portion 60 includes the waterproof film 64 in the root portion 65, it is preferable that the waterproof film and the liquid-impermeable sheet 11 in the root portion 65 have a width of 5 mm in the width direction. The overlapping part above.

The size 11y of the liquid-impermeable sheet 11 in the front-back direction is the same as the size of the front-back direction of the absorbent member 50 as shown in FIG. The liquid-impermeable sheet is longer than the absorbing member 50 as shown in FIGS. 9 (a) and 9 (b), and is provided in a larger range in the front-rear direction than the absorbing member 50. The liquid-impermeable sheet 11 may be folded back to the inside of the exterior bodies 12F and 12B at the waist opening in the same manner as the cover sheet 13 shown in FIGS. 9 (a) and 9 (b). However, as shown in FIG. In the case where the liquid-impermeable sheet is provided only on the outer sides of the exterior bodies 12F and 12B, it is preferable that the edge of the waist opening WO side of the liquid-impermeable sheet 11 be separated from the waist opening WO to the intercondylar side, particularly preferably It is located on the intercondylar side from the waist W.

Particularly in the case of a two-part exterior type such as this, the position where the front exterior body 12F and the rear exterior body 12B are separated in the front-rear direction LD corresponds to the urine supply position, and leakproofness is particularly important. Area. In this embodiment, although the liquid-impermeable sheet 11 is located outside the exterior bodies 12F and 12B, in such a two-part exterior structure, the front exterior body 12F and the rear exterior body 12B are in the front-back direction LD. At the upper separation position, the liquid-impermeable sheet 11 can be used to cover the portion 203 of the inner body 200 that does not have the liquid-impermeable sheet 11 without the outer bodies 12F and 12B. Therefore, it is not easy to place urine on the outer skin. The bodies 12F and 12B penetrate inside and ooze to the outside. In particular, when the three-dimensional pleated portion 60 has a root portion 65 fixed to a side portion on the back side of the inner body 200, the front outer body 12F and the rear outer body 12B are in the front-rear direction LD. At the separated position, the root portion 65 of the three-dimensional pleated portion 60 and the liquid-impermeable sheet 11 can be directly adhered together, so that a structure excellent in leak resistance can be formed. In addition, since the cover sheet 13 described later is provided throughout the front exterior body 12F and the rear exterior body 12B, it has a continuous appearance and skin feel throughout the front exterior body 12F and the rear exterior body 12B.

The material of the liquid-impermeable sheet 11 is not particularly limited, and examples thereof include a plastic film made of an olefin resin such as polyethylene or polypropylene. The liquid-impermeable sheet 11 is preferably a material having liquid-impermeable and moisture-permeable properties, which is preferably used from the viewpoint of preventing stuffiness. As a moisture-permeable plastic film, a microporous plastic film obtained by mixing an inorganic filler with an olefin resin such as polyethylene or polypropylene, forming a sheet, and extending along one or two axes is widely used.

The liquid-impermeable sheet 11 is attached with a pattern for decoration (including characters of painting and single-dot patterns), a method of using or displaying functions such as assistance, size, or a display of a manufacturer or a product name, a characteristic function, or the like. Decorative printing. When a highly opaque resin film is used for the liquid-impermeable sheet 11, it is necessary to perform printing on the outer surface. However, for example, when a highly transparent resin film is used, the printing section can be provided in a liquid-impermeable layer. The inner surface of the sexual sheet 11.

In the case of the exterior-integrated type, the inner surface of the liquid-impermeable sheet 11 is adhered to the outer sheet layer 12S as the facing body by a hot-melt adhesive 11H. In addition, the exterior two-part type In the case, the inner surface of the liquid-impermeable sheet 11 is adhered to the outer sheet 12S of the front-side exterior body 12F and the rear-side exterior body 12B and the back of the inner body 200 by a hot-melt adhesive 11H. As for the liquid-impermeable sheet 11, it is preferable that at least both side end portions (preferably the entire width direction) are continuously adhered in the product length direction in the main region other than the front and rear end portions thereof. Further, in a form in which the three-dimensional pleated portion 60 includes the waterproof film 64 in the root portion 65 as shown in the figure, a portion where the waterproof film 64 and the liquid-impermeable sheet 11 at the root portion 65 overlap is located in the waterproof film. The width of all the adhesive layers between 64 and the liquid-impermeable sheet 11 (in the case where the adhesive layer is one layer) is preferably 3 mm or more, particularly preferably 5 mm or more, in the adhesive layer. In the case of multiple layers, it is preferable to have all the portions where the adhesive layers overlap, and the width of the portions where the adhesive layers overlap is preferably 3 mm or more. The front and rear end portions of the liquid-impermeable sheet 11 are not adhered to the exterior bodies 12F and 12B, but may be adhered to the exterior body in the same manner as the region between the front and rear end portions.

(Cover Sheet) The entire outer surface of the liquid-impermeable sheet 11 is covered with a cover sheet 13 made of a non-woven fabric. Thereby, even if the liquid-impermeable sheet 11 is provided outside the exterior bodies 12F and 12B, the product outer surface like a cloth can be formed. In addition, since the decorative print 27 is provided on the liquid-impermeable sheet 11, it is not necessary to use a dedicated decorative print 27 sheet. In addition, although the decorative print 27 can be seen through the cover sheet 13 through perspective, the decorative print 27 27 is close to the outer surface of the product, and can be visually confirmed more clearly.

In the illustrated form, one cover sheet 13 is used to cover the entire outer surface of the liquid-impermeable sheet 11, but it may be configured that cover sheets 13 and the like are provided on the front body and the back body respectively, and multiple cover sheets are used to cover The entire outer surface of the liquid-impermeable sheet 11.

The range of the cover sheet 13 in the front-rear direction is not particularly limited, and can be the same as or larger than the liquid-impermeable sheet 11. Reference numeral 13y in the figure indicates the entire length of the cover sheet 13. For example, as shown in at least one of the front body F and the back body B, as shown in FIGS. 9 (a) and 9 (b), the cover sheet 13 extends toward the waist opening WO, bypasses the edge of the waist opening WO, and moves toward the waist opening WO. The insides of the exterior bodies 12F and 12B are folded back. As a result, the front edge and the rear edge of the cover sheet 13 are not exposed on the outer surface of the product, and the appearance becomes good. In addition, the front edge and the rear edge of the cover sheet 13 do not easily peel off by rubbing against clothing.

In particular, as shown in the figure, if the cover sheet 13 extends to the end on the waist opening WO side of the inner body 200, the folded-back portion 12r of the outer sheet layer 12S of the outer body 12F, 12B can be omitted. In this case, the liquid-impermeable sheet 11 can be folded back inside the exterior bodies 12F and 12B in the same manner as the cover sheet 13, but it is preferable that the liquid-impermeable sheet 11 has a waist opening as shown in the figure. The edge on the WO side is separated toward the intercondylar side with respect to the waist opening WO.

The width direction range of the cover sheet 13 is not particularly limited. In consideration of a manufacturing method described later, it is preferably the same as the liquid-impermeable sheet 11 as shown in FIG. 10, but may be more liquid-impermeable as shown in FIG. 3. Wide range of sex movies. Reference numeral 13x in the figure indicates the full width of the cover sheet 13. Among them, if the cover sheet 13 extends to the stretchable area A2, shrinkage wrinkles are also formed on the cover sheet 13, and therefore, the side ends of the cover sheet 13 are easily peeled off, or the wrinkles are noticeable and become unnatural. On the other hand, if the cover sheet 13 is provided in the width direction range of the non-stretchable area A1, wrinkles are small in the entire range of the cover sheet 13 and the appearance is excellent, which is preferable. In addition, it is more preferable that both side edges of the cover sheet 13 are located on the center side in the width direction from the positions of both side edges of the absorbing member 50. That is, if the side end portion of the cover sheet 13 is located at a portion with low rigidity or is easily deformed, it may peel even if it is adhered to the facing surface. In addition, if the side end portion of the cover sheet 13 is likely to rub against the wearer's legs, there is a higher fear of peeling, and there is also a concern that a step difference deteriorates the skin feel. On the other hand, if the side end portion of the cover sheet 13 is located in a region having the absorbing member 50, that is, a region having higher rigidity than the surroundings, which is not easily deformed, and which does not easily rub against the wearer's legs, the skin feel is not easily deteriorated In addition, when the side ends are adhered to the facing surface, the adhesion is not easy to peel off, and the borders are seamlessly integrated without being noticeable. In addition, in order to form such a structure, it is necessary to provide the liquid-impermeable sheet 11 such as the waterproof film 64 of the three-dimensional pleated portion 60 on the back side of both side portions of the absorbing member 50 in the inner body 200, and provide The width of the liquid-impermeable sheet 11 outside the exterior bodies 12F and 12B is narrowed. In addition, if there is no non-woven fabric on the outer side in the width direction than the positions on both sides of the absorbent member 50 and on the outer side of the outer sheet layer 12S in the exterior bodies 12F and 12B, the portion that does not overlap the absorbent member 50 It is thin and suitable for expansion and contraction, and a portion overlapping the absorbing member 50 is preferable in terms of a soft feel.

The type of the non-woven fabric used for the cover sheet 13 or the processing method of the combination (crosslinking) of the fibers is not particularly limited, and the same non-woven fabric as the material of the exterior bodies 12F and 12B may be appropriately selected, but hot air is desirable. Not woven. The weight per unit area of the cover sheet 13 is preferably about 20 to 40 g / m ² . In addition, the thickness of the cover sheet 13 is preferably 0.3 to 1.0 mm. When the inner sheet layer 12H and the outer sheet layer 12S are non-woven, the thickness of the cover sheet 13 may be thinner than the thickness of each of the inner sheet layer 12H and the outer sheet layer 12S. , But preferably thicker than each of the inner sheet layer 12H and the outer sheet layer 12S. On the other hand, in the case where the inner sheet layer 12H and the outer sheet layer 12S are non-woven fabrics, if the fiber orientations of the inner sheet layer 12H, the outer sheet layer 12S, and the cover sheet 13 are the same in the width direction WD, the vertical and horizontal stretching is extended. Rate (or aspect ratio of tensile elongation) is close. Therefore, when deformation occurs during use, the inner sheet layer 12H, the outer sheet layer 12S, and the cover sheet 13 can be deformed integrally, making it difficult for the side ends of the cover sheet 13 Peeling is preferred. As for the cover sheet 13, it is preferable that the part overlapping with the liquid-impermeable sheet 11 or the area having the decorative print 27 is a single layer, but in other areas, it may be two layers, as shown in FIG. 22 It is also possible to form a double-layer structure by folding back both sides of the cover sheet 13 toward the center side in the width direction WD or by attaching a non-woven fabric separately, and install the elastic member 13G between the layers along the front-back direction LD. This part can be stretched in the front-rear direction.

As the cover sheet 13, a non-porous non-woven fabric having no holes penetrating the front and back surfaces may be used. However, in this embodiment, if the cover sheet is a perforated non-woven fabric provided with a plurality of holes 14 penetrating the front and back surfaces at intervals, not only The air permeability is improved, and the visual confirmation of the decorative printing of the liquid-impermeable sheet is also good, which is preferable.

When a perforated non-woven fabric is used for the cover sheet 13, a region in which the holes 14 are not present may be provided in a part of the cover sheet 13 in the front-back direction LD. However, if the effect of improving the air permeability is considered, it is desirable to provide the entire cover孔 14。 Hole 14. On the other hand, in a mode in which the both ends in the width direction WD of the cover sheet 13 have regions in which the holes 14 do not exist, if the holes 14 are opened by a method other than punching by a cutter, the holes will be described later. The fibers of the peripheral portion 14e of 14 will retreat outward or vertically, causing the peripheral portion 14e of the hole 14 to warp, so that the thickness of the perforated area becomes thicker than the non-perforated area. Therefore, the cover sheet is stored in a rolled state. In the case of the material of 13, the part of the non-porous region is loosely wound, and there is a concern that wrinkles or creases may be formed in the non-porous region on both sides. Therefore, it is desirable to form the hole 14 throughout the entire width direction WD as shown in the figure. In addition, since holes are formed in the cover sheet 13 in the manufacturing step of the diaper, a non-porous material can be used, and the formation position of the holes can be arbitrarily controlled. However, there is a problem in that a hole forming device is introduced. Therefore, the entire manufacturing becomes huge, which increases the cost or maintenance burden. In addition, it is difficult to adjust the hole shape and flexibility in a high-speed production line. Therefore, it is preferable to manufacture using a material having holes formed throughout the entire front-rear direction and the entire width direction.

The planar shape (opening shape) of each hole 14 can be appropriately set. In addition to the long hole shape shown in FIGS. 17 (a) and 17 (b), it can also be set to FIG. 17 (c), A perfect circle as shown in FIG. 17 (e), a polygon such as an ellipse, a triangle, a rectangle, and a rhombus as shown in FIG. 17 (d), and an arbitrary shape such as a star or a cloud. The size of each hole 14 is not particularly limited. The maximum size 14L in the front-back direction LD is preferably 0.4 to 1.8 mm, particularly preferably 0.8 to 1.3 mm, and the maximum size 14W in the width direction WD is preferably 0.3 to 1.5 mm. It is particularly preferably 0.5 to 1.0 mm. In the case where the shape of the hole 14 is a long shape in one direction such as a long hole shape, an ellipse shape, a rectangle shape, a rhombus shape, or the like, the maximum size in the length direction is preferably the maximum size in a direction perpendicular to the length direction. 2.5 times or less. When the shape of the hole 14 is long in one direction, the longitudinal direction of the hole 14 is desirably the front-back direction LD, but may be the width direction WD or the oblique direction.

The area and area ratio of each hole 14 may be appropriately determined, but the area is preferably about 0.2 to 2.5 mm ² (particularly preferably about 0.5 to 1.5 mm ² ), and the area ratio is preferably about 1.0 to 15.0% ( It is particularly preferably about 5.0 to 10.0%).

The planar arrangement of the holes 14 may be appropriately determined, but a regularly repeated planar arrangement is preferable, except for the oblique lattice shape as shown in FIG. 17 (a) or the hexagonal lattice shape as shown in FIG. 17 (b). (These are also referred to as staggered), the square lattice shape shown in FIG. 17 (c), the rectangular lattice shape shown in FIG. 17 (d), and the parallel body lattice shown in FIG. 17 (e) (as shown in the figure) , A group of a plurality of parallel oblique columns is arranged in such a way that two groups intersect each other) (including a shape in which these oblique columns are inclined at an angle of less than 90 degrees with respect to the front-back direction LD) In addition to repeating the pattern, the groups of the holes 14 (the arrangement of the group units may be regular or irregular, or may have a pattern or a letter shape, etc.) may be regularly repeated.

The space 14y in the front-back direction and the space 14x in the width direction can be appropriately determined, but considering the air permeability, it is desirable to set them in the range of 0.5 to 8 mm, and it is particularly desirable to set them in the range of 1 to 5 mm. Here, if the front-to-back direction interval 14y and the width-direction interval 14x are averaged, it is preferable to set their average value in the range of 1 to 5 mm. In particular, as shown in FIG. 17 (d), the shape of the hole 14 is formed to be slender in the front-back direction LD, and the front-back direction interval is narrower than the maximum size 14L in the front-back direction LD of the hole 14. 14y The rows of the holes 14 aligned in the front-back direction are repeated at predetermined intervals in the width direction WD, and the width-direction interval 14x of the holes 14 is larger than the maximum size 14L in the front-back direction LD of the holes 14 (more preferably, the Dimensions of 14W or more in the width direction) can significantly improve the air permeability without impairing the flexibility or bulkiness. In addition, the tensile strength of the sheet in the front-rear direction which is important during manufacture will not decrease. Preferred.

The cross-sectional shape of the hole 14 may be any one of the following methods. In the first method, as shown in FIGS. 14 (a) to 14 (c), the thickness of the nonwoven fabric approaches the hole 14 as it approaches the periphery of the hole 14. The edge of the hole 14 is thinner, and the edge of the hole 14 is located in the middle of the thickness direction of the non-woven fabric. In the second mode, as shown in FIGS. 15 (a) to 15 (c), the peripheral portion 14e of the hole 14 is tilted toward the front side. And the raised height 14h is substantially uniform; and the third aspect, as shown in FIGS. 16 (a) to 16 (c), the peripheral portion 14e of the hole 14 is warped toward the front side, and the peripheral portion 14e has The facing portion having the highest raised height 14i and the portion having the lowest raised height 14j, wherein the portion having the lowest raised height 14j faces in a direction perpendicular to the facing portion having the highest raised height 14i. Facing part. From the viewpoint of improving the air permeability, the second and third aspects are preferred in which the portion having the hole 14 is thicker than the surroundings. In particular, in the third aspect, the raised heights 14i and 14j of the peripheral portion 14e of the holes 14 The gap formed by the difference is preferable because it improves the air permeability. In the second and third aspects, the raised heights 14g, 14h, and 14i (apparent height in a state where no pressure is measured using an optical microscope) are preferably about 0.2 to 1.2 mm. In the third aspect, The highest raised height 14i is preferably about 1.1 to 1.4 times the lowest raised height 14j.

The hole 14 may be a punched hole formed by a cut end of the fiber at the edge portion, or may be a non-punched hole (the fiber density of the peripheral portion is high) such that there is almost no fiber cutting at the edge portion of the hole 14 End, and the non-punched hole is formed by inserting a needle between fibers to expand. The former is suitable for the first aspect, and the latter is suitable for the second and third aspects. For example, if the hole 14 having a long shape in one direction is formed by the insertion of a needle, the fibers of the peripheral portion 14e of the hole 14 are retracted outward or vertically, and the peripheral portion 14e of the hole 14 is raised, and The raised height i of the facing portion in the longitudinal direction of the hole 14 is higher than the raised height j of the facing portion in a direction perpendicular to the longitudinal direction. In the second and third aspects described above, the edge portion of the portion where the peripheral portion 14e of the hole 14 is raised toward the surface may have a lower fiber density than the surrounding portion, but it is preferably the same level or higher. . In addition, the fibers in the peripheral portion 14e of the hole 14 are desirably fused to each other, but they may not be fused to each other.

Regarding the inner surface of the cover sheet 13, when the front-back direction range and the width direction range of the cover sheet 13 and the liquid-impermeable sheet 11 are the same, the inner surface of the cover sheet is only adhered to the When the cover sheet 13 is made larger than the liquid-impermeable sheet 11 as shown in FIG. The superimposed portion of the liquid-impermeable sheet 11 is adhered to the liquid-impermeable sheet 11 by a hot-melt adhesive 13H, and the portion of the inner surface of the cover sheet that exceeds the liquid-impermeable sheet 11 is fused by heat. The adhesive 13H is adhered to the exterior body.

Regarding the cover sheet 13, the cover sheet 13 is adhered to at least both end portions, preferably the entire width direction WD, in the main area except for the front and rear end portions (about 2 to 10 mm). In this case, the cover sheet 13 The side end portion of is preferably adhered to the facing surface, and therefore, the boundary is seamlessly integrated without being noticeable, which is preferable. The front and rear ends of the cover sheet 13 are not adhered to the exterior bodies 12F and 12B, but may be adhered to the exterior body in the same manner as the main area. In particular, when the outer sheet layer 12S is non-woven and the positions of the side edges of the liquid-impermeable sheet 11 and the side edges of the cover sheet 13 coincide, the inner surface of the cover sheet 13 is In areas other than the front and rear end portions, at least both end portions are adhered to the liquid-impermeable sheet 11 by a hot-melt adhesive 13H, and for the inner surface of the liquid-impermeable sheet 11, In areas other than the front and rear end portions, at least both end portions are adhered to the exterior bodies 12F and 12B by the hot-melt adhesive 11H. In this case, the both end portions of the cover sheet 13 are formed of a resin film with a gap therebetween. The liquid-impermeable sheet 11 is adhered to the outer sheet layer 12S made of a non-woven fabric, and therefore, the joints between both side end portions of the cover sheet 13 and the outer sheet layer 12S are firmly formed.

In this way, a structure in which at least both end portions of the cover sheet 13 are bonded by the hot-melt adhesive 13H can be manufactured according to, for example, the manufacturing method shown in FIGS. 20 (a) and 20b. That is, the manufacturing method includes an outer body assembling step (not shown), an elastic member cutting step 301, an inner body attaching step 302, a cover sheet bonding step 303, a waist folding step 304, an unillustrated folding step, and an unillustrated folding step. The illustrated side engagement cut-off step. 20 (a) is a flowchart of a manufacturing facility, and FIG. 20 (b) is a plan view showing changes in the assembled state, and the two figures are drawn in correspondence.

In the outer body assembly step, a sheet continuous in the MD direction is folded toward the CD direction by sandwiching an elastic member continuously supplied in the MD direction, or two sheets continuous in the MD direction are pasted. Together, the outer band 120 having the elastic member interposed between the inner sheet layer and the outer sheet layer is formed. In the exterior band-shaped body 120, the portion to be the exterior body is repeated and continuous in the MD direction so that the width direction WD is the same as the MD direction in the manufacturing line. In the illustrated form, an exterior band-shaped body 120 including a portion of the front-side exterior body 12F which is an exterior two-part type, and an exterior including a portion of the rear-side exterior body 12B are separately formed. The belt-shaped body 120, but in the case of the exterior-integrated type, the exterior-shaped belt-shaped body 120 may be one.

Next, an elastic member cutting step 301 is performed on the formed outer band body 120 as necessary, and a predetermined interval is formed in the MD direction. A cutting device 310 such as heat embossing is used to locate the rear and inner parts. The elastic member 121 at the portion CT where the body 200 overlaps is cut, and at this portion CT, the contraction force of the elastic member 121 is substantially ineffective.

In the inner body mounting step 302, while the outer band 120 is transported in parallel in the CD direction at intervals in the same direction as the unfolded state of the diaper, the outer band 120 is simultaneously and concurrently known by other manufacturing lines by a known method. The manufactured inner body 200 in the unfolded state is sequentially joined to the parts of the outer band body 120 that become the respective outer bodies, thereby forming an inner body assembly in which the parts that become each diaper are in the unfolded state in Continuous in the MD direction. These joining and fixing can be performed by an appropriate means such as a hot-melt adhesive.

In the cover sheet bonding step 303, the cover sheet 13 is adhered to the surface of the exterior band-shaped body 120 opposite to the joining surface of the interior body 200 at intervals in the MD direction. The cover sheet bonding step 303 is only required to be forward than the folding step. However, since the cover sheet 13 extends from the front body F to the rear body B, in the case of an exterior two-part type as shown in the figure, the After the positional relationship between the exterior band-shaped body 120 that is part of the front exterior body 12F and the exterior band 120 that is part of the rear-side exterior body 12B is determined, that is, the interior After the body mounting step 302 is preferred.

In the waist folding step 304, the outer end portion 122 of the outer band 120 in the CD direction is folded back toward the center in the CD direction, and the elastic member 123 is continuously sandwiched under the folded portion in the MD direction. Thereby, attachment of the waist elastic member 17 and formation of the folded-back portion 12r can be performed.

Although the steps after this are not shown, a shorts type disposable diaper can be manufactured by a well-known method. That is, in the folding step, the interior assembly after the interior body 200 is mounted on the exterior belt body 120 and the cover sheet 13 is installed is folded in half in the CD direction, thereby forming a half-folded belt body and joined at the side portions. In the cutting step, the outer body of the front body and the outer body of the rear body are joined together at a portion of the two-folded belt-shaped body that becomes the both sides of each diaper, and the outer body of the front body is joined at the boundary of each diaper. The body and the outer body of the back body were cut, whereby individual diapers were obtained.

It is characterized in that in the cover sheet bonding step 303, the belt-shaped body 130 that is a continuous belt-shaped cover sheet is conveyed along its continuous direction while being borrowed on the bonding surface facing the exterior belt-shaped body 120. The hot-melt adhesive is continuously applied in the MD direction by the coating device 312, and then each cover sheet 13 is cut at intervals in the MD direction by a slide knife 311, and the cover sheet 13 is separated at intervals in the MD direction. The cut cover sheet 13 is adhered to the surface of the exterior band-shaped body 120 opposite to the joint surface of the interior body 200. Thereby, the hot-melt adhesive can be continuously applied to the right side edge of the cover sheet 13 in the width direction WD except for the front and rear end portions of the cover sheet 13, and there can be no overflow of the hot-melt adhesive. The side end portion of the cover sheet 13 is firmly adhered to the facing surface.

In particular, as shown in the figure, before the cover sheet bonding step 303, a form in which the following resin film bonding step 305 is added is a preferred form: a liquid-impermeable sheet made of a resin film subjected to decorative printing The belt-shaped body 111 is continuously adhered to the adhesive surface of the belt-shaped body 130 of the cover sheet facing the exterior belt-shaped body 120 in the MD direction. Reference numeral 313 denotes a coating device for applying a hot-melt adhesive to the adhesive surface of the band-like body 130 of the cover sheet and the band-like body 111 of the liquid-impermeable sheet. Thus, in the cover sheet bonding step 303, the hot melt adhesive is continuously applied in the MD direction by the coating device 312 to the cover sheet of the belt-shaped body 111 to which the liquid-impermeable sheet is adhered. The band-shaped body 130 faces the adhesive surface of the exterior band-shaped body 120, and then each cover sheet 13 and the liquid-impermeable sheet 11 are cut at intervals in the MD direction by a slide knife 311, The cut cover sheet 13 and the liquid-impermeable sheet 11 are adhered to the surface of the exterior band-shaped body 120 opposite to the joining surface of the interior body 200 at intervals in the MD direction. In addition, in this case, both side edges of the cover sheet 13 in the product coincide with both side edges of the liquid-impermeable sheet 11. In this form, after the strip-shaped body 111 of the liquid-impermeable sheet made of a resin film is adhered to the strip-shaped body of the cover sheet 13, each cover sheet 13 is cut out and adhered to the exterior belt-shaped body 120. Since the rigidity of each cover sheet 13 after cutting is increased corresponding to the presence of the resin film, and the air permeability is significantly reduced, the slide blade 311 is used to hold the suction as shown by the arrow in the figure, and it is relative to the outer tape. When the shape body 120 is intermittently adhered, the shape and suction retention are stable, and stable adhesion can be achieved.

Although it is not shown in the figure, the strip body 111 of the liquid-impermeable sheet may not be adhered to the strip body 130 of the cover sheet, but may be adhered to the exterior strip body 120 before the cover sheet 13 is adhered. The liquid-impermeable sheet 11 is connected, and the cover sheet 13 is adhered to the liquid-impermeable sheet.

In the case where the cover sheet 13 is a perforated nonwoven fabric, a previously processed perforated nonwoven fabric can be used as the cover sheet 13. However, in order to reduce material costs, processing on a manufacturing line is preferable. However, when a non-woven fabric is perforated, the higher the speed of the processing line, the more difficult it is to perform high-precision processing with stability. On the other hand, in the cover sheet bonding step 303 of the manufacturing method shown in the figure, the cutting and intermittent sticking are performed to make the supply speed of the band-shaped body 130 of the cover sheet to the cover sheet bonding step 303 slow. If a perforation device 314 is added to the supply line of the belt-shaped body of the cover sheet 13 for the cover sheet bonding step 303 as shown in the figure, and a perforation step 306 for the cover sheet 13 is performed, stable perforation processing can be realized. Therefore, it is preferable.

On the other hand, in the case of the cover sheet 13 having the holes 14, a preferred bonding structure is: as shown in FIGS. 18 (a) to 18 (d), on the inner surface and the outer surface of the cover sheet 13 In at least one of the bonding regions, the hot-melt adhesive 13H does not exist at the center side of the peripheral edge portion 14i of the area overlapping the hole 14, and the thermal fusion bonding is performed outside the peripheral edge portion 14i of the area overlapping the hole 14. Agent 13H is present in a continuous plane. Since the hot-melt adhesive 13H does not exist at the center side of the peripheral edge portion 14i of the area overlapping the hole 14, the air permeability is excellent. In addition, such an adhesive structure is provided only on the surface on the opposite side of the surface in contact with the skin. At the portion having such an adhesive structure, it is not easy for the skin to feel sticky due to the hot-melt adhesive 13H. The peripheral portion 14e of the hole 14 is reliably fixed to the facing surface.

As a typical adhesion state, the following states can be exemplified: as shown in FIGS. 18 (a) and 18 (b), the hot-melt adhesive 13H does not exist in the area overlapping the hole 14, and Outside the area where the 14 overlaps, the hot-melt adhesive 13H exists in a continuous plane shape; and, as shown in FIGS. 18 (c) and 18 (d), the hot-melt adhesive 13H is at the periphery of the area where the hot-melt adhesive 13H overlaps. The portion 14i overflows, but the hot-melt adhesive 13H does not exist at the center side of the peripheral edge portion 14i of the area overlapping the hole 14, and the hot-melt adhesive 13H exists outside the peripheral edge portion 14i of the area overlapping the hole 14. Exist in a continuous surface. The former state is a particularly desirable state. However, since the peripheral edge portion 14i of the area overlapping the hole 14 is a portion close to the peripheral portion 14e of the hole 14 and the cover sheet 13 has a certain thickness, even if the heat is made as in the latter case, The fusing adhesive 13H overflows in this portion, but at a portion where only the surface on the opposite side of the surface in contact with the skin adheres, when the surface of the cover sheet 13 on the side opposite to the adhesive surface is touched by hand, There is almost no direct contact with the hot-melt adhesive 13H. The overflow width of the hot-melt adhesive 13H at the peripheral edge portion 14i of the area overlapping the hole 14 is preferably less than or equal to half of the thickness of the cover sheet 13 and about 0.5 mm or less. In addition, it is desirable that the hot-melt adhesive 13H is not present in a portion of 80% or more of the area of the area overlapping the hole 14.

The cross-sectional shape of the hole 14 in the cover sheet 13 is not particularly limited, but if the peripheral portion 14e of the hole 14 is a warped portion that is warped toward the liquid-impermeable sheet 11 as described above, the liquid-impermeable property The pore diameter viewed from the surface on the opposite side of the sheet 11 is smaller than the pore diameter viewed from the liquid-impermeable sheet 11 side. Therefore, in a portion where only the surface on the opposite side of the surface in contact with the skin is adhered, when the surface on the opposite side of the adhesion surface is touched by hand, the hot-melt adhesive 13H is not easily touched. In addition, since the warped portion supports the cover sheet 13 with respect to the facing surface like a support post, it is more bulky and has better air permeability than a non-porous nonwoven fabric having the same basis weight. In addition, in the area other than the peripheral portion 14e of the hole 14, the adhesion between the cover sheet 13 and the liquid-impermeable sheet 11 easily floats (although it is depicted as hot melt in FIGS. 18 (a) to 18 (d). The adhesive 13H fills the space between the sheets without a gap, but the substantial application amount is small, and a gap is easily generated). Therefore, the peripheral portion 14e of the hole 14 is reliably adhered, and it becomes ineffective in other areas. Complete adhesion (substantially smaller adhesion area), thereby obtaining excellent softness and softness.

Such an adhesive structure can be manufactured by applying a hot-melt adhesive to the adhesive surface of a porous non-woven fabric in a continuous surface shape without using air, and bonding it to the opposite surface. . This method is based on a new finding: if a hot-melt adhesive is applied to the adhesive surface of a non-woven fabric in a continuous surface without using air, The surface tension of the fusion adhesive is provided with a hole (hole) in the center of the portion of the hot-melt adhesive that overlaps the hole of the non-woven fabric, and the opening is enlarged to the periphery of the hole of the non-woven fabric. That is, if such an adhesion method is adopted, as shown by the arrow shown in FIG. 19, after the hot-melt adhesive 13H is continuously applied to the perforated nonwoven fabric and before being bonded to the target member, Due to the surface tension of the hot-melt adhesive 13H, a hole (hole) h is opened in the center of the portion of the hot-melt adhesive 13H that coincides with the hole 14 of the non-woven fabric, and the opening h is enlarged to the hole 14 of the non-woven fabric.的 围 部 14e。 The surrounding portion 14e. Therefore, after the porous nonwoven fabric is adhered to the target member, as shown in the examples shown in FIGS. 18 (a) to 18 (d), the hot-melt adhesive 13H does not exist in most of the holes 14, nor does it exist. Since the hot-melt adhesive 13H is detached or exuded from the hole 14 due to air, it is not easy to produce a sticky skin touch when the surface on the opposite side of the adhesive surface is touched by hand.

As a hot-melt applicator that applies a hot-melt adhesive in a continuous plane without using air, it can be suitably used: slit coating to adhere the coating head (die) to the non-woven fabric with holes Surface contact, extruding a hot-melt adhesive from a gap provided in the end of the coating head along the CD direction (a direction perpendicular to the MD direction (conveying direction of the manufacturing line)) for coating; or a non-contact type slot type For coating, the hot-melt adhesive is extruded from a gap in the CD direction provided at the end of the coating head with the coating head (die) floating from the adhesive surface of the perforated nonwoven fabric. The difference in the conveying speed of the hole non-woven fabric extends the hot-melt adhesive, thereby coating it into an extremely thin film.

The bonding conditions can be appropriately determined, but in order to quickly move the hot-melt adhesive 13H that overlaps the hole 14 to the peripheral portion 14e of the hole 14 and firmly bond the peripheral portion 14e of the hole 14, it is desirable to satisfy the following conditions At least one. Melt viscosity of hot-melt adhesive (temperature 140 ° C): 3000 ～ 2600mpas Melt viscosity of hot-melt adhesive (temperature 160 ℃): 1150 ～ 1550mpas Temperature when applying hot-melt adhesive to porous nonwoven fabric: 110 ～ 150 ℃ Application amount of hot-melt adhesive for porous nonwoven fabric: 1.0 ～ 8.0g / m ² Open time after application of hot-melt adhesive: 0.1 ～ 1.0 second

<Explanation of Terms in the Manual> Unless otherwise stated in the manual, the following terms in the manual have the following meanings.

・ The "front-back (longitudinal) direction" refers to the direction connecting the ventral (front) and back (back) sides, and the "width direction" refers to the direction (left-right) perpendicular to the front-back direction.

・ "MD direction" refers to the conveying direction of the manufacturing line and is an abbreviation for the machine direction. "CD direction" refers to the transverse direction perpendicular to the MD direction and is an abbreviation for the cross direction. Either one is the front-back direction of the product and the other is the product. The width direction. The MD direction of the nonwoven fabric is the direction in which the fibers of the nonwoven fabric are aligned.

・ "Fiber orientation" is the direction along which the non-woven fibers are along, and can be determined by, for example, the following measurement methods: Measurement methods according to the fiber alignment test method, wherein the fiber alignment test method is based on the TAPPI standard method T481 Test method for zero-distance tensile strength; or a simple measurement method for determining the fiber alignment direction based on the ratio of the tensile strength in the front-back direction and the width direction.

・ "Front side" refers to the side close to the wearer's skin when wearing shorts-type disposable diapers, and "back side" refers to the side farther from the wearer's skin when wearing shorts-type disposable diapers.

・ "Front" refers to the side of the part that is close to the wearer's skin when wearing shorts-type disposable diapers, and "back" refers to the side that is far from the wearer's skin when wearing shorts-type disposable diapers.

・ "Area ratio" refers to the ratio of the target area to the unit area, and is the ratio of the area of the target area (for example, the hole) in the target area (for example, the mask) divided by the area of the target area and expressed as a percentage. In a method in which a plurality of target portions are provided at intervals, it is desirable to set a target area for a size including 10 or more target portions and obtain an area ratio. For example, the area ratio of the pores can be measured using, for example, a device manufactured by KEYENCE Corporation under the trade name VHX-1000, setting the measurement conditions to 20 times, and performing the measurement in the following order. (1) Set the lens to 20 times and adjust the focal length. Adjust the position of the non-woven fabric so that 4 × 6 holes appear. (2) Specify the brightness of the area of the hole and measure the area of the hole. (3) Click on the color extraction of "Area Measurement" in "Measurement and Notes". Click on the part of the hole. (4) Click “Measuring together” and select “Show measurement result window” to save as CSV data.

・ "Elongation" means the value when the natural length is 100%.

・ "Gel strength" is measured as follows. 49.0 g of artificial urine (mixed with urea: 2 wt%, sodium chloride: 0.8 wt%, calcium chloride dihydrate: 0.03 wt%, magnesium sulfate heptahydrate: 0.08 wt%, and ion-exchanged water: 97.09 wt% 1.0 g of a superabsorbent polymer was added to the mixture and stirred with a blender. The generated gel was allowed to stand in a constant temperature and humidity tank at 40 ° C. × 60% RH for 3 hours, and then returned to normal temperature. The gel strength was measured with a curd meter (Curdmeter-MAX ME-500 manufactured by I.techno Engineering). .

・ "Weight per unit area" is measured as follows. After the sample or test piece is pre-dried, it is placed in a test room or device in a standard state (the temperature of the test site is 20 ± 5 ° C and the relative humidity is 65% or less), so that it becomes a constant state. Pre-drying means that the sample or test piece is made constant in an environment with a relative humidity of 10 to 25% and a temperature of not more than 50 ° C. In addition, the fiber having a legal moisture content of 0.0% may not be subjected to preliminary drying. Using a template for sample selection (200 mm × 250 mm, ± 2 mm), a specimen having a size of 200 mm × 250 mm (± 2 mm) was cut out from the test piece in a constant state. The weight of the sample was measured, and the weight per square meter was calculated 20 times as the weight per unit area.

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

・ Water absorption is measured in accordance with JIS K7223-1996 "Test method for water absorption of superabsorbent resin".

・ The water absorption rate is the "time to the end point" when performing JIS K7224-1996 "Test method for water absorption rate of superabsorbent resin" using 2g of superabsorbent polymer and 50g of physiological saline.

・ "Expanded state" refers to a state that is flatly expanded without contraction or slack.

・ The dimensions of each part are the dimensions in the unfolded state and not in the natural length state unless otherwise specified.

・ If there is no record of the environmental conditions in the test or measurement, the test or measurement is performed in a standard laboratory (the test place is at a temperature of 20 ± 5 ° C and a relative humidity of 65% or less) in a test room or device. .

[Industrial Applicability] The present invention can be used for shorts-type disposable diapers.

11‧‧‧ Liquid-impermeable tablet

12A‧‧‧Side seal

12B‧‧‧ Rear side body

12F‧‧‧Front exterior body

12H‧‧‧ inside sheet

12S‧‧‧outer sheet

13‧‧‧ cover

14‧‧‧hole

17‧‧‧ waist elastic

18‧‧‧ excess elastic parts

200‧‧‧Inner body

201, 202‧‧‧ inside and outside joints

27‧‧‧Decorative printing

30‧‧‧Top film

301‧‧‧ Elastic parts cutting step

302‧‧‧Inner body installation steps

303‧‧‧Covering steps

304‧‧‧Waist Back Step

305‧‧‧Resin film bonding steps

306‧‧‧Perforation steps

40‧‧‧ Intermediate

50‧‧‧ Absorptive member

56‧‧‧ Absorber

58‧‧‧Packaging tablets

60‧‧‧Three-dimensional folds

60A‧‧‧Terminal side part

60B‧‧‧Root side part

62‧‧‧ Wrinkled non-woven fabric

67‧‧‧ Loose portion

A1‧‧‧Non-retractable area

A2‧‧‧Retractable area

B‧‧‧ behind

C‧‧‧Hip cover

F‧‧‧ Formerly

L‧‧‧ middle area

LD‧‧‧Forward and Backward

T‧‧‧waist area

U‧‧‧ Waist

W‧‧‧ Waist

WD‧‧‧Width direction

WO‧‧‧ Waist opening

FIG. 1 is a plan view showing an inner surface of a pants-type disposable diaper in an unfolded state. FIG. 2 is a plan view showing an outer surface of the pants-type disposable diaper in an expanded state. FIG. 3 is a sectional view taken along line 2-2 in FIG. 1. FIG. 4 is a sectional view taken along line 3-3 in FIG. 1. FIG. 5 (a) is a cross-sectional view taken along line 4-4 in FIG. 1, and FIG. 5 (b) is a cross-sectional view taken along line 5-5 in FIG. 1. FIG. 6 is a perspective view of a shorts type disposable diaper (a hole is omitted). FIG. 7 is a plan view showing an outer surface of the inner body in a developed state. FIG. 8 is a plan view showing the outer surface of the inner body in the expanded state together with the outline of the outer body. FIG. 9 (a) is a cross-sectional view taken along line 4-4 in FIG. 1, and FIG. 9 (b) is a cross-sectional view taken along line 5-5 in FIG. 1. FIG. 10 is a cross-sectional view taken along line 2-2 in FIG. 1. FIG. 11 is a plan view showing an outer surface of the pants-type disposable diaper in an expanded state. FIG. 12 is a plan view showing an outer surface of the pants-type disposable diaper in an expanded state. FIG. 13 (a) is a sectional view taken along line 4-4 in FIG. 12, and FIG. 13 (b) is a sectional view taken along line 5-5 in FIG. Fig. 14 (a) is a perspective view showing a hole of the non-woven fabric, Fig. 14 (b) is a plan view showing a hole of the non-woven fabric, and Fig. 14 (c) is taken along line 8-8 in Fig. 14 (b) Cutaway view. Fig. 15 (a) is a perspective view showing the holes of the non-woven fabric, Fig. 15 (b) is a top view showing the holes of the non-woven fabric, and Fig. 15 (c) is taken along line 8-8 in Fig. 15 (b) Cutaway view. Fig. 16 (a) is a perspective view showing the holes of the non-woven fabric, Fig. 16 (b) is a top view showing the holes of the non-woven fabric, and Fig. 16 (c) is taken along line 8-8 in Fig. 16 (b) Cutaway view. 17 (a) to 17 (e) are enlarged top views of important portions of the non-woven fabric having holes. 18 (a) and 18 (c) are cross-sectional views of an adhesive portion of the cover sheet, and FIGS. 18 (b) and 18 (d) are plan views of the adhesive portion of the cover sheet. FIG. 19 is a plan view showing a change in the application of the hot-melt adhesive. FIG. 20 (a) is a flowchart of a manufacturing facility of a shorts type disposable diaper, and FIG. 20 (b) is a plan view showing a change in an assembled state. FIG. 21 (a) is an exploded assembly view showing an important part of a conventional laminated structure, and FIG. 21 (b) is an exploded assembly view showing an important part of a laminated structure of the present invention. FIG. 22 is an exploded assembly view showing an important part of the laminated structure of the present invention.

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Claims (8)

A shorts-type disposable diaper includes an outer body constituting at least a waist region of a front body and at least a waist region of a rear body; and an inner body having an absorbent member built therein, which extends from the front body to the rear body. The exterior body includes: an elastic member; an inner sheet layer adjacent to an inner side of the elastic member; and an outer sheet layer adjacent to an outer side of the elastic member; and the front body Both sides of the outer body and both sides of the outer body of the rear body are joined together to form a waist opening and a pair of left and right leg openings. The shorts type disposable diaper is characterized in that: the inner At least the middle portion in the width direction of the package is a portion that does not have a liquid-impermeable sheet at a position outside the absorbent member. The shorts-type disposable diaper has a liquid-impermeable sheet made of a resin film. The liquid-permeable sheet passes through a portion located outside the outer sheet layer in the exterior body and covers the entirety of the interior body without the liquid-impermeable sheet. Decoration on liquid-permeable sheet Brushes, and the cover sheet of liquid-impermeable sheet composed of the whole outer surface of a non-woven fabric covering. The shorts-type disposable diaper according to claim 1, wherein both side edges of the cover sheet are located at positions on the center side in the width direction from positions of both side edges of the absorbent member, and the cover sheet In the area other than the front and rear end portions of the inner surface, at least both end portions are adhered to the facing surface by a hot-melt adhesive. The shorts type disposable diaper according to claim 2, wherein the inner sheet layer and the outer sheet layer are non-woven fabrics, and the fibers of the inner sheet layer, the outer sheet layer, and the cover sheet are aligned in a width direction. The shorts-type disposable diaper according to any one of claims 1 to 3, wherein the cover sheet extends toward the waist opening on at least one of the front body and the back body, and extends toward the inner sheet layer at the waist opening. Turn inside. The shorts-type disposable diaper according to any one of claims 1 to 3, wherein the outer body has a non-stretchable region provided in a widthwise middle portion of a region overlapping the absorbent member; And, the telescopic area is provided on both sides in the width direction of the non-stretchable area; and the cover sheet is provided in the width direction range of the non-stretchable area. The shorts type disposable diaper according to any one of claims 1 to 3, wherein the outer sheet layer is a non-woven fabric, and the positions of the edges of the two sides of the liquid-impermeable sheet and the sides of the cover sheet The positions of the edges are the same. The inner surface of the cover sheet is adhered to the liquid-impermeable sheet by a hot-melt adhesive at least at both end portions in a region other than the front and rear end portions thereof, and, The inner surface of the liquid-impermeable sheet is adhered to the exterior body by a hot-melt adhesive in at least two end portions in a region other than the front and rear end portions thereof. The shorts-type disposable diaper according to any one of claims 1 to 3, wherein the shorts-type disposable diaper includes at least a waistline front outer body constituting a front body and at least a rear body constituting a rear body formed separately from each other. The outer body at the rear side of the waistline portion is used as the outer body, and the front outer body and the rear outer body are separated at the middle of the front-rear direction along the front-rear direction. The shorts-type disposable diaper according to any one of claims 1 to 3, wherein the cover sheet is a perforated nonwoven fabric provided with a plurality of holes penetrating the front and back surfaces at intervals.