TWI746723B - Shorts type disposable diaper and manufacturing method thereof - Google Patents

Abstract

The problem to be solved by the present invention is to provide a shorts-type disposable diaper and a manufacturing method thereof. In the shorts-type disposable diaper, the part that does not overlap the absorbent member is thin and suitable for stretching, and the part that overlaps the absorbent member is soft The tactile feel is excellent in this respect. The above-mentioned problem is solved by the following solution. A shorts-type disposable diaper is provided with: a front outer body 12F; a rear outer body 12B; and an inner body 200 in which the absorbent member 50 is built in. The body 200 is installed from the front exterior body 12F to the rear exterior body 12B; wherein the shorts-type disposable diaper has a cover sheet 13 made of non-woven fabric, and the cover sheet 13 passes through the absorbent member 50 The position of both side edges of the absorbing member 50 is located on the center side in the width direction and on the outer side than the outer sheet layer 12S in the exterior body. And the outer part of the outer sheet layer 12S in the exterior body does not have non-woven fabrics other than the cover sheet 13, and the inner surface of the cover sheet 13 is at least on both sides in the area other than the front and rear ends Adhere to the opposite surface with hot melt adhesive.

Description

Shorts type disposable diaper and manufacturing method thereof

The present invention relates to a shorts-type disposable diaper and a manufacturing method thereof.

Generally speaking, a shorts-type disposable diaper has: an outer body, which separately or integrally constitutes a front body and a back body; and, an inner body including an absorbent member, which is installed on the outer body in a manner that extends from the front body to the back body In the body, the side edges of the outer body of the front body and the side edges of the outer body of the back body are joined together to form a side seal, 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 exterior body is formed into a laminated structure having a plurality of sheets, and various elastic members are installed between the sheets in an extended state. Among them, the following structure has a relatively high fit with respect to the body: in the waist area defined as the front-rear direction range corresponding to the side seal portion, or the intermediate area between the front and rear waist areas, it is separated in the front-rear direction An elongated elastic member along the width direction is attached at intervals and in a state extended in the width direction to form a stretchable area (for example, refer to Patent Documents 1 to 5).

In addition, in general underpants-type disposable diapers, the outer body is required to be more stretchable than the absorbent member in the width direction. Therefore, it is preferable that the outer body is closer to the outer side in the width direction than the absorbent member. In the area of the elastic member, the inner sheet and the outer sheet adjacent to the inner and outer sides of the elastic member are made of thin non-woven fabrics to avoid damage to stretchability or thickening. On the other hand, in order to suppress the stiff feel caused by having the inner body at the part of the outer body that coincides with the inner body, it is preferable that the inner sheet layer and the outer sheet layer use soft thickness Non-woven.

However, since the conventional exterior body is formed of sheets that are continuous in the width direction and has a laminated structure that is continuous in the width direction, it is impossible to have the part overlapping the absorbent member and the part not overlapping the absorbent member. Opposite characteristics.

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

[Problem to be solved by the invention] Therefore, the main problem to be solved by the present invention is to provide a shorts-type disposable diaper in which the part that does not overlap with the absorbent member is thin and suitable for expansion and contraction, and the part that overlaps with the absorbent member It is excellent in soft touch.

[Technical Means for Solving the Problems] A representative mode of the present invention that solves the above-mentioned problems is as follows. <First aspect> A shorts-type disposable diaper, comprising: an outer body that constitutes at least the waist region of the front body and at least the waist region of the back body; and, an inner body in which the absorbent member is incorporated, which extends from the front body It is mounted to an outer body in a manner to the back body, the outer body having: an elastic member; an inner sheet layer adjacent to the inner side of the elastic member; and, an outer side sheet layer adjacent to the outer side of the elastic member, and , Both sides of the outer body of the front body and both sides of the outer body of the back body are joined together to form a waist opening and a pair of left and right leg openings. The characteristics of the shorts-type disposable diaper The shorts-type disposable diaper has a cover sheet made of a non-woven fabric, and the cover sheet passes through the center side in the width direction rather than the position of the both side edges of the absorbent member and is larger than the all in the outer body. The portion of the outer sheet layer on the outside extends in the front-rear direction, and is located on the outer side in the width direction than the position of both side edges of the absorbent member and on the outer side of the outer sheet layer in the exterior body , There is no non-woven fabric other than the cover sheet, and the inner surface of the cover sheet, in the area other than the front and rear ends, at least two side ends are bonded to the opposing surface by hot melt adhesive .

(Effects) In this method, a cover sheet made of non-woven fabric is additionally laminated and pasted on the exterior body, and the cover sheet passes through the center side in the width direction than the position on both sides of the absorbent member and is higher than the exterior body. The outer sheet layer in the body extends in the front-rear direction, and is positioned on the widthwise outer side than the position of the both side edges of the absorbent member and on the outer side than the outer sheet layer in the exterior body , There is no non-woven fabric other than the cover sheet, so the part that does not overlap the absorbent member is thin and suitable for stretching, and the part that overlaps the absorbent member is excellent in terms of soft touch. In addition, when the additional non-woven fabric is overlapped and pasted only on the outer side of the exterior body, when the exterior body expands and contracts in the width direction, there is a concern that the seams between the stacked non-woven fabric and the exterior body become conspicuous. Or the side ends of the non-woven fabrics pasted in an overlapping manner are easy to peel off. In particular, if the side end of the cover sheet is located at a portion with low rigidity or is easily deformed, peeling may occur even if it is adhered to the facing surface. In addition, if the side end of the cover sheet is likely to rub against the wearer's legs, there is a higher risk of peeling, and there is also a concern that the step difference makes the skin feel worse. On the other hand, in this method, the side end of the cover sheet is located in an area where the rigidity is higher than the surroundings and is not easily deformed and does not easily rub against the wearer's legs. Therefore, the adhesion to the facing surface is difficult to peel off , And the skin feel is not easy to deteriorate. In addition, since the side ends of the cover sheet are adhered to the facing surface, the boundary is seamlessly integrated and not conspicuous. Furthermore, in this aspect, the width direction range of the cover sheet is located in the area with the absorbent member, that is, the area that is thicker than the surrounding area and has low flexibility and air permeability. Therefore, the increase in thickness caused by the cover sheet and the Of course, the reduction in flexibility and air permeability caused by this hardly becomes a problem.

<Second aspect> The shorts-type disposable diaper according to the first aspect, wherein the inner sheet layer and the outer sheet layer are non-woven fabrics, and the fiber orientation of the inner sheet layer, the outer sheet layer, and the cover sheet is the width direction.

(Effects) In this way, if the fiber orientations of the inner sheet, outer sheet, and cover sheet are the same in the width direction, the longitudinal and longitudinal tensile elongation (or the aspect ratio of the tensile elongation) are close. Therefore, when in use When deformation occurs in the inner sheet, the outer sheet and the cover sheet can be deformed integrally, the seams between the cover sheet and the outer body that are superposedly adhered are not easily noticeable, and the side ends of the cover sheet are difficult to peel off.

<3rd aspect> The shorts-type disposable diaper according to the 1st or 2nd aspect, wherein the front edge of the cover sheet is located on the rear side than the front edge of the absorbent member, and the rear edge of the cover sheet is located A position closer to the front side than the rear edge of the absorbing member.

(Effects) If the front and rear edges of the cover sheet are located in low-rigidity portions or are easily deformed, they are easily separated from the opposing surface. Even if they are adhered to the opposing surface, they may peel off. In addition, if the front edge and the rear edge of the cover sheet are separated or peeled from the facing surface, wrinkles in the boundary portion between the cover sheet and the exterior body are likely to become conspicuous and give an unnatural appearance. In contrast, in the second aspect of the present invention, the front edge and the rear edge of the cover sheet are located in the area with the absorbing member, that is, the area where the rigidity is higher than the surrounding area and is not easily deformed. Therefore, it is difficult to separate or peel off from the facing surface. Therefore, it is possible to prevent a situation in which wrinkles in the boundary portion between the cover sheet and the outer sheet layer become noticeable and become an unnatural appearance.

<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 faces the waist opening at the waist opening. The inner side of the inner sheet is folded back.

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

<Fifth aspect> A shorts-type disposable diaper according to any one of aspects 1 to 4, wherein the outer covering body has a non-stretchable area provided in the width of the area overlapping the absorbent member Direction middle part; and, a stretchable region, which is provided on both sides of the non-stretchable region in the width direction; and the cover sheet is provided within the widthwise range of the non-stretchable region.

(Effects) If the cover sheet is provided in the width direction range of the non-stretchable area in this way, wrinkles are less in the entire range of the cover sheet, and the aesthetics are excellent. In contrast, if the cover sheet extends to the stretchable region, 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 give an unnatural appearance.

<Sixth aspect> The shorts-type disposable diaper according to any one of aspects 1 to 5, wherein a decorative printed sheet is interposed between the outer sheet layer of the exterior body and the cover sheet , The decorative printing sheet has decorative printing adjacent to the inner surface of the cover sheet.

(Effects) In this aspect, a decorative printing sheet is interposed between the outer sheet layer of the exterior body and the cover sheet, and the decorative printing can be seen through only the cover sheet, so the visual confirmation of the decorative printing is high.

<Seventh aspect> The underpants-type disposable diaper according to any one of the aspects 1 to 6, wherein the underpants-type disposable diaper includes at least the front side of the waist portion of the front body formed separately from each other and a structure At least the waist portion of the back body is a rear outer body as the outer body, the front outer body and the rear outer body are separated in the front-rear direction in the middle of the front-to-rear direction, and the inner body has a covering body The liquid-impermeable sheet on the back side of the absorbent member, the liquid-impermeable sheet having an exposed portion exposed at least in the widthwise middle portion of the back surface of the inner body, the liquid-impermeable sheet It is a decorative printed sheet with decorative printing in the exposed portion of the area between the front side exterior body and the rear side exterior body, and the cover sheet is at least from the front side in the front-to-rear direction The exterior body extends to the rear exterior body.

(Effects) In the case of decorative printing on the liquid-impermeable sheet with the exposed part exposed on the back of the inner body, if the two-part exterior structure of this method is adopted, and the liquid-impermeable sheet is The decorative printing is exposed at the part where the front exterior body and the rear exterior body are separated in the front-to-rear direction. At the part covered by the cover sheet, the decorative printing can only be seen through the cover sheet, so it can Improve the visual confirmation of the decorative printing of the liquid-impermeable sheet. In addition, since the cover sheet extends at least from the front exterior body to the rear exterior body in the front-rear direction, it has a continuous appearance and skin feel throughout the front exterior body and the rear exterior body.

<Eighth aspect> The shorts-type disposable diaper according to any one of aspects 1 to 7, wherein the inner sheet layer and the outer sheet layer are non-woven fabrics, and the cover sheet is thicker than the inner sheet layer and the inner sheet layer. The thickness of each of the outer sheet layers is thick.

(Effects) As a result, the part that does not overlap the absorbent member is thinner and is suitable for expansion and contraction, and the part that overlaps the absorbent member is more excellent in terms of soft touch.

<Ninth aspect> A shorts-type disposable diaper according to any one of aspects 1 to 8, wherein the cover sheet is a perforated nonwoven fabric in which a plurality of holes penetrating the front and back surfaces are provided at intervals.

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

<10th aspect> A method for manufacturing a shorts-type disposable diaper, which is the method for manufacturing a shorts-type disposable diaper of the first aspect, characterized in that the method for manufacturing the shorts-type disposable diaper includes: an outer body assembly Step, forming a belt-shaped exterior body, on the belt-shaped exterior body, the part that becomes the exterior body repeats and continues in the MD direction in such a way that the width direction thereof is consistent with the MD direction; the interior body installation step , While conveying the belt-shaped exterior body so that the width direction of the diaper becomes the MD direction, the separately manufactured interior body in the unfolded state is sequentially joined to the belt-like exterior body. The parts of each exterior body thus form an interior assembly body in which the parts of each diaper are continuous in the MD direction in an unfolded state; the cover sheet bonding step, which separates the cover sheet in the MD direction Adhered to the surface of the belt-shaped exterior body on the side opposite to the joining surface of the interior body; a folding step, which folds the interior assembly body in the CD direction, thereby forming a half-fold Belt-shaped body; and, the side part joining and cutting off step, which joins the outer body of the front body and the outer body of the back body at the part of each diaper in the double-folded belt body that becomes the side part Together, and cut the outer body of the front body and the outer body of the back body at the boundary of each diaper to obtain each diaper; and, in the step of adhering the cover sheet, one side will be in a strip shape The strip-shaped body of the continuous cover sheet is conveyed along its continuous direction, while continuously applying hot-melt adhesive to the strip-shaped body of the cover sheet facing the strip-shaped exterior body in the MD direction On the bonding surface, the strip-shaped body of the cover sheet is cut into individual cover sheets at intervals in the MD direction, and the cut cover sheet is bonded at intervals in the MD direction On the surface of the belt-shaped exterior body on the side opposite to the joining surface of the interior body.

(Effects) In the form where the cover sheet is attached to the back of the inner body as in the past, the MD direction of the assembly line of the inner body is regarded as the front and back direction of the inner body. When the cover sheet is pasted, the front and back of the cover sheet The direction is also set as the MD direction. In this case, it is difficult to apply the hot-melt adhesive used to stick the cover sheet to the side edges of the cover sheet accurately and to the limit. Therefore, it is difficult to apply the hot-melt adhesive to both ends of the cover sheet as described above. Adhesive. On the other hand, if the cover sheet is pasted like this, the hot melt adhesive can be continuously applied to the right side edge of the cover sheet in the width direction, except for the front and rear ends of the cover sheet. The overflow of the hot melt adhesive firmly adheres the side ends of the cover sheet to the opposite surface. Therefore, the shorts-type disposable diaper of the first aspect can be easily manufactured.

<Eleventh aspect> The method for manufacturing a shorts-type disposable diaper according to a tenth aspect, wherein a resin film bonding step is provided before the cover sheet bonding step, and decoration is applied in the resin film bonding step The printed resin film is adhered to the adhesive surface of the tape-shaped body of the cover sheet facing the tape-shaped exterior body, and, in the cover sheet bonding step, continuously in the MD direction The hot-melt adhesive is applied to the adhesive surface facing the belt-shaped exterior body in the belt-shaped body of the cover sheet to which the resin film is bonded, and then spaced in the MD direction The band-shaped body of the cover sheet is cut into individual cover sheets at intervals, and the cut cover sheet is bonded to the band-shaped exterior body and the cover sheet at intervals in the MD direction. The surface on the side opposite to the joining surface of the inner body.

(Effects) In this method, after the resin film is pasted on the band-shaped body of the cover sheet, each cover sheet is cut and pasted on the band-shaped exterior body. Therefore, the cut of each cover sheet The rigidity is increased corresponding to the presence of the resin film. Therefore, when the tape-shaped exterior body is intermittently pasted, the shape is stable and stable pasting can be achieved.

<12th aspect> The method of manufacturing a shorts-type disposable diaper according to the 10th or 11th aspect, wherein a perforation step is provided before the cover sheet bonding step, and in the perforation step, the cover sheet is adhered to the cover sheet. A plurality of holes penetrating the front and back surfaces of the cover sheet are formed in the cover sheet on the supply line for supplying the strip-shaped body of the cover sheet in the subsequent step.

(Effects) If the cover sheet is such a perforated nonwoven fabric, the air permeability, flexibility, bulkiness (softness), etc. can be improved, so it is preferable. In this case, a pre-processed perforated non-woven fabric can be used as the cover sheet, but in order to reduce material costs, processing on the manufacturing line is preferable. However, in the case of perforating a nonwoven fabric, the faster the processing line speed, the more difficult it is to perform high-precision processing stably. In this regard, in the cover sheet bonding step of the above-mentioned manufacturing method, the supply speed of the band-shaped body of the cover sheet for the cover sheet bonding step is slowed due to the cutting and intermittent bonding. Therefore, if the method is In this way, by performing the perforation step for the cover sheet on the supply line of the strip-shaped body that supplies the cover sheet to the cover sheet bonding step, stable perforation processing can be realized.

[Effects of the Invention] As described above, according to the present invention, there are advantages such as a shorts-type disposable diaper, etc.: the part that does not overlap the absorbent member is thin and suitable for expansion and contraction, and the part that overlaps the absorbent member is soft to the touch The feeling is excellent in this aspect.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The dotted part in the cross-sectional view shows the adhesive as a joining means for joining the components on the front side and the back side. The whole surface coating, linear coating, curtain It is formed by coating, key part coating or spiral coating, or pattern coating (transfer of hot-melt adhesive by relief printing), or the fixed part of the elastic member replaces the adhesive or It is formed by applying the adhesive to the outer peripheral surface of the elastic member using a coating gun, glue coating, or the like. As the hot-melt adhesive, there are types of adhesives such as EVA-based, adhesive rubber-based (elastic system), olefin-based, and polyester polyamide-based adhesives, and they can be used without particular limitations. As a joining means for joining the constituent members, a means based on material welding such as heat sealing or ultrasonic sealing may also be used.

Figures 1 to 8 show an example of a shorts-type disposable diaper. This shorts type disposable diaper is provided with: a front outer body 12F constituting at least the waist part of the front body F; a rear outer body 12B constituting at least the waist part of the back body B; and an inner body 200 in which the absorbent member 50 is built-in , It is installed in the exterior body 12F, 12B in a manner extending from the front exterior body 12F through the crotch to the rear exterior body 12B, both sides of the front exterior body 12F and the rear exterior body 12B The sides are joined to form the side seal 12A, whereby the openings formed by the front and rear ends of the exterior bodies 12F and 12B become waist openings WO through which the wearer's waist can pass. Both sides in the width direction of the interior body 200 , The portions respectively surrounded by the lower edges of the exterior bodies 12F and 12B and the side edges of the interior body 200 become leg openings LO through which the legs can pass. The inner body 200 is a part that absorbs and retains excrement such as urine, and the outer bodies 12F and 12B are support bodies that perform the function of supporting the inner body 200 with respect to the wearer's body. In addition, the symbol Y indicates the full length of the diaper in the unfolded state (the length in the front-rear direction from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the back body B), and the symbol X indicates the entire length of the diaper in the unfolded state. width.

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

(Interior body) The interior body 200 can take any shape, but is rectangular in the form shown in the figure. As shown in FIGS. 3 to 5(b), the inner body 200 includes an absorbent member 50 and a liquid-permeable top sheet 30 covering the front side of the absorbent member. The inner body is a main body that performs an absorption function. Numeral 40 indicates an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbing member 50 in order to quickly move the liquid that has passed through the top sheet 30 to the absorbing member 50, and numeral 60 indicates that to prevent leakage of excrement into the inside. The two sides of the body 200 are three-dimensional wrinkles 60 that protrude from both sides of the inner body 200 so as to contact the wearer's legs.

(Top Sheet) The top sheet 30 has a property of permeating liquid, and examples thereof include porous or non-porous non-woven fabrics, porous plastic sheets, and the like. In addition, the raw material fiber of the nonwoven fabric is not particularly limited. For example, olefin-based such as polyethylene or polypropylene, synthetic fibers such as polyester-based, polyamide-based, regenerated fibers such as rayon or cupra, natural fibers such as cotton, etc., or two or more of them are used. The mixed fiber, composite fiber and so on. In addition, non-woven fabrics can be manufactured by any process. As a processing method, well-known methods can be illustrated, for example, a spunlace method, a spunbond method, a hot rolling method, a melt blown method, a needle punch method, a hot air method, a point bonding method, and the like. For example, if flexibility and drapability are sought, spunbonding and spunlace are the preferred processing methods, and if bulkiness and flexibility are sought, 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 plane direction, or may be composed of two or more sheets.

The both sides of the top sheet 30 may be folded back to the back side at the side edge of the absorbent member 50, and may not be folded back but may protrude laterally from the side edge of the absorbent member 50.

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

(Intermediate Sheet) In order to make the liquid that has passed through the top sheet 30 move to the absorber quickly, an intermediate sheet (also referred to as a second sheet) 40 whose liquid permeation speed is faster than that of the top sheet 30 may be provided. The intermediate sheet 40 is used for the purpose of moving the liquid to the absorber quickly to improve the absorption performance of the absorber, and preventing the absorbed liquid from seeping back from the absorber. The intermediate piece 40 may be omitted.

As the intermediate sheet 40, the same material as the top sheet 30, or spunlace nonwoven fabric, spunbonded nonwoven fabric, SMS nonwoven fabric, pulp nonwoven fabric, mixed sheet of pulp and rayon, dot-bonded nonwoven fabric, or crepe paper can be exemplified. In particular, hot-air non-woven fabrics are bulky and therefore preferred. For the hot-air nonwoven fabric, it is preferable to use a composite fiber with a core-sheath structure. In this case, the resin used for the core may be polypropylene (PP), but it is preferably high-stiffness polyester (PET). 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 make the nonwoven fabric bulky, it is preferable to use an eccentric fiber, a hollow fiber, or an eccentric and hollow fiber whose core is not in the center as the mixed fiber of all or part of the raw fiber.

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

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

(Three-dimensional gathers part) The three-dimensional gathers part 60 extends along both sides of the inner body 200 over the entire front and rear direction LD, and stands up from the side of the inner body 200 to the front side, and is in contact with the wearer's legs. Contact and prevent side leakage.

Regarding the three-dimensional corrugated portion 60 of this embodiment, the root-side portion 60B stands up obliquely toward the center side in the width direction, and the portion 60A that is closer to the end side than the middle portion rises obliquely outward in the width direction, but the three-dimensional corrugated portion is not limited to this It may be appropriately changed, such as a manner in which the whole rises toward the center side in the width direction. In more detail, the three-dimensional gather portion 60 of the present embodiment is configured as follows: a belt-shaped gather portion non-woven 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 and folded into two parts, and between the folded part and the adjacent sheet, a plurality of elongated folds are fixed at intervals in the width direction WD in a state elongated in the longitudinal direction. Part 63. The base end portion of the three-dimensional gather portion 60 on the side opposite to the distal end portion (the end portion on the side opposite to the sheet-folded portion in the width direction WD) is a side portion fixed to the back side of the inner body 200 The upper root portion 65, the portion other than the root portion 65 is the main body portion 66 (the portion on the side of the turned-back portion) protruding from the root portion 65. In addition, the main body portion 66 has a root side portion 60B that extends to the center side 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. The present method is a surface contact type three-dimensional corrugation portion 60, but a line contact type three-dimensional corrugation portion 60 that is not folded outward in the width direction may be adopted. In addition, the front and rear end portions of the main body portion 66 are the undulating portions 67 that are fixed to the side surface of the top sheet 30 in the collapsed state. On the other hand, the front and rear middle portions located between them are not fixed freely. The portion 68 is fixed to at least the end portion of the free portion 68 in an extended state of the corrugated elastic member 63 along the front-rear direction LD.

In the three-dimensional corrugated portion 60 configured as described above, the contraction force of the corrugated elastic member 63 acts to bring the front and rear ends close to each other, but the front and rear ends of the main body 66 do not stand up. In contrast to this, a free portion 68 that is not fixed is formed between the two ends. Therefore, as shown in FIG. 3, only the free portion 68 stands up so as to abut against 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 rises from the crotch portion and its vicinity so as to splay outward in the width direction, so the three-dimensional corrugated portion 60 will abut on the surface. Around the legs to improve fit.

As the wrinkle non-woven fabric 62, spunbonded non-woven fabrics (SS, SSS, etc.), SMS non-woven fabrics (SMS, SSMMS, etc.), melt-blown non-woven fabrics, etc., which are soft and excellent in uniformity and concealment can be used as needed. ^{It is preferable that the weight of the unit area of the fiber is about 10-30 g/m 2 in the} non-woven fabric of the wrinkle part obtained by water-repellent treatment of the non-woven fabric. As the gather elastic member 63, a rubber thread or the like can be used. In the case of using a spandex rubber thread, the thickness is preferably 470 to 1240 dtex, and more preferably 620 to 940 dtex. The elongation at the time of fixation is preferably 150 to 350%, and more preferably 200 to 300%. In addition, the term "elongation" indicates the value when the natural length is 100%. In addition, as shown in the figure, a waterproof membrane 64 may be interposed between the wrinkle non-woven fabric 62 folded into two parts. In this case, the wrinkle non-woven fabric may be partially omitted at the portion where the waterproof membrane 64 is present. 62. However, in order to form the appearance and skin feel of the product like a cloth, it is necessary to form at least the outer surface of the three-dimensional gather part 60 from the base end to the end with the gather part non-woven fabric 62 as shown in the figure.

In the three-dimensional corrugated portion 60 of the present embodiment, the main body portion 66 is composed of a root side portion 60B extending to the center side 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. In the bent configuration of, 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 the joining of the facing surfaces in the lodging portion 67, at least one of hot-melt adhesives based on various coating methods, and means based on material welding such as heat sealing and 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 join the end side portion 60A and the root side portion 60B by material welding.

The number of corrugation elastic members 63 provided in the free part of the three-dimensional corrugation part 60 is preferably 2 to 6, and more preferably 3 to 5. It is appropriate for the arrangement interval 60d to be 3 to 10 mm. With such a configuration, it is easy to contact the skin on the surface within the range where the wrinkle elastic member 63 is arranged. The corrugation elastic member 63 may be arranged not only on the tip side but also on the root side.

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

Similarly, for the fixing of the waterproof membrane 64 and the non-woven fabric 62 of the wrinkle portion 60 incorporated in the three-dimensional wrinkle portion 60, or the fixing of the lodging portion 67, hot melt adhesives based on various coating methods, and heat sealing or superposition can be used. At least one of the means based on material welding such as sonic sealing.

The size of the three-dimensional gathers 60 in this embodiment can be appropriately determined, but in the case of diapers for infants, for example, as shown in FIG. The direction length) W2 is preferably 15 to 60 mm, particularly preferably 20 to 40 mm. In addition, the separation distance W1 between the innermost fold lines in a state where the three-dimensional gathers 60 is flatly folded in parallel with the front surface of the top sheet 30 is preferably 60 to 190 mm, particularly preferably 70 to 140 mm.

(Absorbent member) The absorbent member 50 has an absorber 56 and a packaging sheet 58 covering the entire absorber 56. When the shape maintainability of the absorber 56 is excellent, etc., you may omit the packaging sheet 58 as needed.

(Absorber) The absorber 56 may be formed of an aggregate of fibers. As the fiber assembly, in addition to the assembly formed by piling short fibers such as cotton pulp or synthetic fibers, it is also possible to use tows (fiber bundles) of synthetic fibers such as cellulose acetate as needed. A collection of filaments (filament) obtained by spinning. The weight per unit area of the fiber may be, for example, about 100 to 300 g/m ² in the case of piling cotton-like pulp or short fibers, and in the case of filament aggregates, for example, about 30 to 120 g. /m ² . In the case of synthetic fibers, the fineness is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex. In the case of a filament assembly, the filaments may be non-crimped fibers, but crimped fibers are preferred. The degree of crimp of the crimped fiber may be, for example, 5 to 75 per 2.54 cm, preferably 10 to 50, and more preferably about 15 to 50. In addition, crimped fibers that are evenly crimped are used in many cases. It is preferable to disperse and hold superabsorbent polymer particles in the absorber 56.

The absorber 56 may have a rectangular shape, but if it is also formed into an hourglass shape in the middle of the front-rear direction that has a narrower width than the front and rear sides 56N in the middle of the front-rear direction as shown in Figs. 1 and 7, it absorbs The body 56 itself and the three-dimensional gathers 60 have improved fit with respect to the legs and are therefore preferable.

In addition, the size of the absorber 56 can be appropriately determined as long as it covers the front, rear, left, and right sides of the urinary opening position, but it is preferable to extend to the peripheral edge portion of the inner body 200 or its vicinity in the front-rear direction LD and the width direction WD. In addition, reference numeral 56X represents the full width of the absorber 56.

(Superabsorbent polymer particles) A part or all of the absorber 56 may contain superabsorbent polymer particles. With regard to superabsorbent polymer particles, "powder" is included in addition to "particles". As the superabsorbent polymer particles 54, the superabsorbent polymer particles used in such absorbent articles can be used as they are. The particle size of the superabsorbent polymer particles is not particularly limited, but it is desirable to have such a particle size: for example, when performing screening (5 minutes vibrating sieve) using a standard sieve of 500 μm (JIS Z 8801-1: 2006), The proportion of particles remaining on the 500μm standard sieve when the particles falling under the sieve in the above screening are sieved using a 180μm standard sieve (JIS Z 8801-1: 2006) (5 minutes vibrating sieve) It is 30% by weight or less, and the ratio of particles remaining on a 180 μm standard sieve is 60% by weight or more.

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

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

As the superabsorbent polymer particles, it is preferable to use superabsorbent polymer particles having a gel strength of 1000 Pa or more. Thereby, even in the case of forming the bulky absorber 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 according to the amount of absorption required by the use of the absorbent body 56. Therefore, it cannot be generalized, but it can be 50 to 350 g/m ² . If the weight per unit area of the polymer is less than 50 g/m ² , it is difficult to ensure the absorption capacity. If 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, particularly crepe paper, non-woven fabric, composite laminated non-woven fabric, sheet with small holes, etc. can be used. However, it is desired to be a sheet in which the superabsorbent polymer particles do not fall out. In the case of using non-woven fabrics instead of crepe paper, hydrophilic SMS non-woven fabrics (SMS, SSMMS, etc.) are particularly preferred, and polypropylene, polyethylene/polypropylene composite materials, etc. can be used as the material. The weight per unit area is desirably 5 to 40 g/m ² , and particularly desirably 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 manufacture and prevention of the leakage of superabsorbent polymer particles from the front and rear edges, the following method is preferable: the packaging sheet 58 surrounds the front surface of the absorber 56 It is wound into a cylindrical shape with the back and both sides, and the front and rear edges are exposed from the front and back of the absorber 56, and the overlapped part and the front and back are exposed by joining means such as hot melt adhesive and material welding. The overlapping parts are joined together.

(Part not having liquid-impermeable sheet) In the form shown in Figs. 3 to 5(b), at least the widthwise middle part of the inner body 200 is not impermeable to the part outside the absorbent member 50. The part 203 of the liquid sheet 11. That is, in this embodiment, the liquid-impermeable sheet 11 that prevents bleeding toward the back side, which is generally provided in the inner body 200 in the past, is not provided in the inner body 200. In addition, in this embodiment, since the waterproof membrane 64 incorporated in the three-dimensional gathers 60 extends to the back side of the absorbent member 50 at 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, however, may be in a form in which the waterproof membrane 64 is not present in the three-dimensional corrugated portion 60, or in a form in which the waterproof membrane 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 part that does not have the liquid-impermeable sheet 11 at a location outside the absorbent member 50. In addition, waterproof membranes other than the waterproof membrane 64 of the three-dimensional corrugated portion 60 may be provided at a location outside the absorbent member 50 at both ends in the width direction WD of the inner body 200.

(Exterior body) The outer body 12F, 12B is composed of a front outer body 12F that constitutes at least the waist portion of the front body F, and a rear outer body 12B that constitutes at least the waist portion of the back body B. The front outer The body 12F and the rear outer body 12B are discontinuous on the crotch side and are separated in the front-rear direction LD. The separation distance 12d may be about 150 to 250 mm, for example. In addition, as shown in FIGS. 12 to 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 crotch to the rear body B.

The exterior bodies 12F and 12B have a waist part which is a front-rear direction range corresponding to the waist area T. As shown in FIG. In addition, in this embodiment, the front-to-rear dimension of the rear exterior body 12B is longer than that of the front exterior body 12F, and the front exterior body 12F does not have a portion corresponding to the middle region L, but the rear exterior body 12B It has a buttocks cover C protruding from the waist area T to the middle area L side. Although not shown in the figure, a groin cover extending from the waist area T to the middle area L side is also provided on the front exterior body 12F, or the groin cover is provided but the buttocks cover is not provided, or It is not necessary to provide a portion corresponding to the intermediate region L on both the front exterior body 12F and the rear exterior body 12B. In addition, although the lower edge of the buttocks cover portion C and the lower edge of the front exterior body 12F are formed linearly in the width direction WD in the illustrated manner, it may be formed closer to the waist opening side as it goes to the width direction outside. Curve.

As shown in Figures 4 to 5(b), the exterior bodies 12F and 12B are formed by joining the outer sheet layers 12S and 12S on the outer and inner sides of the elastic members 15 to 19, which will be described later, by joining means such as hot-melt adhesive or welding. The inner sheet layers 12H are joined together. The sheet forming the outer sheet layer 12S and the sheet forming the inner sheet layer 12H may be a common sheet or separate sheets. That is, in the former case, part or all of the exterior body is formed by using the inner part and the outer part of a sheet folded at the edge of the waist opening WO (or at the edge of the crotch side) respectively to form the inner side Sheet layer 12H and outer sheet layer 12S. In addition, the former method has an advantage that the number of sheets is small, and the latter method has an advantage that it is difficult to cause positional shift when bonding the inner sheet layer 12H and the outer sheet layer 12S. The method shown in the figure corresponds to the latter. The sheet forming the inner sheet layer 12H only extends to the edge of the waist opening WO, but the sheet forming the outer sheet layer 12S goes around the waist side edge of the sheet of the inner sheet layer 12H. The inner side is folded back, and the folded-back portion 12r extends so as to cover the waist end of the inner body 200.

As the sheets used for the outer sheet layer 12S and the inner sheet layer 12H, they can be used without particular limitation, but non-woven fabrics are preferred. For example, the following non-woven fabrics can be used. Synthetic fibers such as polyamide-based, polyamide-based, or mixed fibers or composite fibers using two or more of them. In addition, the non-woven fabric can be manufactured by any process. As a processing method, well-known methods can be illustrated, for example, a spunlace method, a spunbond method, a hot rolling method, a melt blown method, a needle punch method, a hot air method, a point bonding method, and the like. In the case of using a non-woven fabric, its weight per unit area is preferably about 10-30 g/m ² . In addition, it is preferable that the thickness of the non-woven fabric used for the outer sheet layer 12S and the non-woven fabric used for the inner sheet layer 12H is 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 about 20 to 60 g /m ² .

(Stretching area and non-stretching area) In the outer body 12F, 12B, in order to improve the fit for the waist of the wearer, it is preferable to provide elastic members 15 to 19 between the outer sheet layer 12S and the inner sheet layer 12H , Thereby forming an expansion and contraction area A2 that elastically expands and contracts in the width direction WD in accordance with the expansion and contraction of the elastic members 15-19. In this stretch area A2, in a naturally long state, the outer sheet layer 12S and the inner sheet layer 12H shrink with the contraction of the elastic member, thereby forming wrinkles or folds. When the outer sheet layer 12S and the inner sheet layer 12H When the elastic member is stretched in the longitudinal direction, it can be stretched to a predetermined elongation rate as follows: ultimate stretch without wrinkles. As the elastic members 15 to 19, in addition to elongated elastic members (illustrated examples) such as rubber threads, known elastic members such as a belt shape, a mesh shape, and a film shape can also be used without particular limitation. As the elastic members 15-19, 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 15-19 sandwiched between them, hot melt adhesives 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 will be impaired. Therefore, it is preferable not to adhere or weakly adhere the parts other than the adhesive portions of the elastic members 15 to 19. In the form shown in the figure, it is a structure in which a hot-melt adhesive is applied to only the outer peripheral surfaces of the elastic members 15-19 by coating means such as a coating gun or a glue nozzle, and the two sheets 12S, Therefore, only the hot-melt adhesive applied on the outer peripheral surface of the elastic members 15-19 is used to fix the elastic members 15-19 with respect to the two sheets 12S, 12H, and the two Fixation between the layers 12S and 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 expansion and contraction direction in the expansion and contraction region.

The elastic members 15-19 of the illustrated form will be described in more detail. A plurality of waist elastic members 17 are attached to the waists of the exterior bodies 12F, 12B at intervals in the front-rear direction so as to be continuous over the entire width direction WD. Between the outer sheet 12S and the inner sheet 12H at W. In addition, one or more of the waist elastic members 17 arranged in the area adjacent to the lower waist portion U may overlap with the inner body 200, or the width overlapping with the inner body 200 may be removed The central part of the direction is respectively provided on both sides of the width direction. As the waist elastic member 17, it is preferable to provide about 3-22 pieces at an interval of 4-12mm, with a thickness of 155-1880dtex, particularly preferably about 470-1240dtex (in the case of synthetic rubber. In the case of natural rubber, cut An area of 0.05 to 1.5 mm ² , particularly preferably about 0.1 to 1.0 mm ² ) of the rubber thread, based on the set waist W in the width direction WD elongation, preferably 150 to 400%, particularly preferably about 220 to 320%. In addition, for the waist W, it is not necessary to use the same thickness or the same elongation of the waist elastic member 17 in the front-rear direction LD.

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

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

In addition, between the outer sheet layer 12S and the inner sheet layer 12H in the buttocks 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 elastic member 16, it is preferable to provide one or a plurality of them at intervals in the front-rear direction. The thickness is 155 to 1880 dtex, particularly preferably about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber) , A rubber thread with 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 hip cover portion C in the width direction WD, preferably 150 to 300%, particularly preferred It is 180～260%.

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

As shown in Fig. 2 and the like in the lower waist portion U or the buttocks cover portion C, when the elastic members 15, 16, 19 are provided in the range of the front-rear direction with the absorber 56, in order to cover a part or all of the range To prevent shrinkage of the absorber 56 in the width direction WD, the middle in the width direction (preferably including the entire inner and outer joint portions 201, 202) including a part or all of the portion overlapping with the absorber 56 in the width direction WD is set to In the non-stretchable area A1, both sides in the width direction are set as the stretchable area A2. It is preferable to set the waist W over the entire width direction WD as the stretchable area A2, but like the waist lower portion U, a non-stretchable area A1 may be provided in the middle of the width direction. Of course, as in the form shown in FIG. 11, the elastic member may not be cut without providing the non-stretchable area A1.

Such a stretchable area A2 and a non-stretchable area A1 can be formed by supplying elastic members 15-17, 19 between the inner sheet layer 12H and the outer sheet layer 12S, in the stretchable area A2 at least in the stretch direction At both ends, the elastic members 15, 16, 19 are fixed with hot-melt adhesive. In the area that becomes the non-stretching area A1, the elastic members 15, 16, 19 are not fixed, and in the area that becomes the non-stretching area A1 , At a position in the middle of the width direction, the elastic members 15, 16, 19 are cut by pressing and heating, or almost the whole of the elastic members 15, 16, 19 is cut finely by pressing and heating, thereby The stretchability is maintained in the stretchable area A2, while the stretchability is eliminated in the non-stretchable area A1. In the former case, as shown in FIG. 4, in the non-stretching area A1, the elastic members 15, 16, 19 of the stretchable area A2 are cut continuously and the remaining part is separately contracted to the natural length as an extra elastic member 18 In the state of remaining between the outer sheet layer 12S and the inner sheet layer 12H, in the latter case, although not shown, the remaining part after cutting continuous with the elastic members 15, 16, 19 of the stretch area A2, and the The cut pieces of the elastic members that are continuous with the elastic members 15, 16, and 19 of the two stretchable regions A2 remain between the outer sheet layer 12S and the inner sheet layer 12H in a state of being individually contracted to a natural length as an excess elastic member.

(Inner-outer joint part) The fixing of the inner body 200 to the outer bodies 12F and 12B can be performed by a bonding means based on material welding such as heat sealing and ultrasonic sealing, or a hot melt adhesive. The inner and outer joints 201, 202 that fix the inner body 200 and the outer body 12F, 12B together can be arranged in almost the entire area where the two overlap, for example, can be arranged on both ends of the inner body 200 except for the widthwise ends Outside the department.

(Liquid-impermeable sheet) In this embodiment, as shown in FIG. 21(b), a liquid-impermeable resin film is provided on the outer side of the outer sheet 12S in the exterior bodies 12F and 12B. The liquid-impermeable sheet 11 covers the entire portion 203 of the inner body 200 that does not have the liquid-impermeable sheet 11. The present form is different from the conventional form in which the liquid-impermeable sheet 11 is provided on the inner side of the exterior bodies 12F and 12B as shown in FIG. 21(a) in this point. In addition, this liquid-impermeable sheet 11 is a decorative printed sheet to which decorative printing 27 is applied as shown in FIGS. 2 and 7. In addition, a decorative sheet may be included without providing a decorative printed sheet.

Regarding the liquid-impermeable sheet 11, as long as it can cover the entire portion 203 of the inner body 200 that does not have the liquid-impermeable sheet 11, the size and position in the front-rear direction and the width direction can be appropriately determined. Generally, for the liquid-impermeable sheet 11, in the case of an exterior two-part type, it is preferable that the width of the inner body 200 is the narrowest part as shown in FIG. 8 (in the case of the illustrated form, the inner body The liquid-impermeable sheet is provided with a narrower full width 11x within the width direction range of the full width 200x of 200. In the case of an exterior integrated type, it is preferable to place the exterior body 12 and the interior body as shown in FIG. The narrowest part of 200 has the larger width (the outer body 12 in the figure) and the narrowest part in the width direction is provided with this liquid impermeability with a narrower full width 11x piece. In addition, the full width 11x of the liquid-impermeable sheet 11 is preferably greater than the full width of the portion 203 of the inner body 200 that does not have the liquid-impermeable sheet 11 by 10 mm or more. In particular, in order to improve leakage resistance, in the case where the three-dimensional corrugated portion 60 has a root portion 65 fixed to the side portion on the back side of the inner body 200, it is preferable that the root portion 65 and liquid impermeability 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 corrugated portion 60 includes the waterproof membrane 64 in the root portion 65, it is preferable that the waterproof membrane of the root portion 65 and the liquid-impermeable sheet 11 have a width of 5 mm in the width direction. Overlapping part of the above.

The front-rear dimension 11y of the liquid-impermeable sheet 11 is the same as the front-rear dimension of the absorbent member 50 as shown in FIG. However, the liquid-impermeable sheet is longer than the absorption member 50 as shown in FIGS. 9( a) and 9 (b ), and is provided in a range in the front-rear direction larger than the absorption member 50. The liquid-impermeable sheet 11 can also be folded back inside the outer body 12F, 12B at the waist opening in the same way as the cover sheet 13 shown in Figs. 9(a) and 9(b), but as shown in Fig. 8 In the case where the liquid-impermeable sheet is provided only on the outside of the exterior bodies 12F, 12B, it is preferable to separate the edge of the liquid-impermeable sheet 11 on the side of the waist opening WO to the crotch side with respect to the waist opening WO, and it is particularly preferable It is located closer to the crotch side than the waist W.

Especially in the case of the exterior two-part split type such as this method, 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 leakage prevention is particularly important. Area. In this embodiment, although the liquid-impermeable sheet 11 is located on the outside of the exterior bodies 12F and 12B, in such an exterior two-part structure, the front exterior body 12F and the rear exterior body 12B are in the front-rear direction LD At the upper separated 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 intervening the outer bodies 12F and 12B. Therefore, it is not easy for urine to be placed on the outer body. The bodies 12F and 12B are soaked in and exuded to the outside. In particular, in the case where the three-dimensional corrugated portion 60 has the root portion 65 fixed to the side on the back side of the interior body 200, the front exterior body 12F and the rear exterior body 12B are in the front-rear direction LD At the separated position, the root portion 65 of the three-dimensional corrugated portion 60 and the liquid-impermeable sheet 11 can be directly bonded together, so that a structure with excellent leakage resistance can be formed. Furthermore, since the cover sheet 13 described later is provided over the front exterior body 12F and the rear exterior body 12B, it is formed into 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. For example, a plastic film made of an olefin resin such as polyethylene or polypropylene can be exemplified. For the liquid-impermeable sheet 11, it is preferable to use a material having liquid-impermeability and moisture permeability, which is preferably used from the viewpoint of preventing stuffiness. As a moisture-permeable plastic film, a microporous plastic film obtained by mixing an olefin resin such as polyethylene or polypropylene with an inorganic filler and forming a sheet and then extending in one or two directions is widely used.

The liquid-impermeable sheet 11 is attached with patterns for decoration (including figures of paintings and single-dot patterns), use methods or use aids, size and other functional display, or manufacturer or product name, feature function and other logo display, etc. Decorative printing. When a highly opaque resin film is used for the liquid-impermeable sheet 11, it is necessary to print on the outer surface. However, for example, when a highly transparent resin film is used, the printing section can also be provided on the liquid-impermeable sheet. The inner surface of the sex piece 11.

In the case of the exterior integral type, the inner surface of the liquid-impermeable sheet 11 is adhered to the outer sheet 12S as the facing surface of the exterior body by the hot-melt adhesive 11H. In addition, the exterior is divided into two parts. In the case of, the inner surface of the liquid-impermeable sheet 11 is bonded to the outer sheet 12S of the front exterior body 12F and the rear exterior body 12B and the back surface of the interior body 200 by the hot-melt adhesive 11H. Regarding the liquid-impermeable sheet 11, it is preferable that at least both side ends (preferably the entire width direction) be continuously adhered in the product length direction in the main area except for the front and rear ends thereof. Furthermore, in the form in which the three-dimensional wrinkle portion 60 includes the waterproof membrane 64 in the root portion 65 as shown in the figure, the portion where the waterproof membrane 64 of the root portion 65 overlaps the liquid-impermeable sheet 11 is located in the waterproof membrane The width of all the adhesive layers between 64 and the liquid-impermeable sheet 11 (when the adhesive layer is one layer, this layer) is preferably 3 mm or more, particularly preferably 5 mm or more. In the case of multiple layers, it is preferable to have all the parts where the adhesive layers overlap, and the width of the part 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, 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 on the outer side of the exterior bodies 12F and 12B, it is possible to form the outer surface of a product like a cloth. In addition, since the decorative printing 27 is provided on the liquid-impermeable sheet 11, it is not only unnecessary to use the dedicated decorative printing 27 sheets, but also, although the decorative printing 27 can be seen through the cover sheet 13, the decorative printing 27 is close to the outer surface of the product, allowing visual confirmation more clearly.

In the illustrated form, one cover sheet 13 is used to cover the entire outer surface of the liquid-impermeable sheet 11. However, it can also be configured to provide cover sheets 13 on the front body and the back body, respectively, and cover with a plurality of cover sheets The entire outer surface of the liquid-impermeable sheet 11.

The range of the front-rear direction of the cover sheet 13 is not particularly limited, and may be the same as the liquid-impermeable sheet 11 or a larger range. The reference numeral 13y in the figure indicates the full length of the cover sheet 13. For example, it may be: in at least one of the front body F and the back body B, as shown in Fig. 9(a) and Fig. 9(b), the cover sheet 13 extends toward the waist opening WO, and goes around the edge of the waist opening WO. The inner sides of the exterior bodies 12F and 12B are folded back. Thereby, 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, it is unlikely that the front and rear edges of the cover sheet 13 rub against clothes and peel off.

In particular, as shown in the figure, if the cover sheet 13 extends to the end of the inner body 200 on the waist opening WO side, the folded 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 to the inside of the outer body 12F, 12B in the same way as the cover sheet 13. However, it is preferable that the waist of the liquid-impermeable sheet 11 is opened as shown in the figure. The edge on the WO side is separated from the waist opening WO to the crotch side.

The width direction range of the cover sheet 13 is not particularly limited. In consideration of the manufacturing method described later, it is preferably the same as the liquid-impermeable sheet 11 as shown in FIG. 10, but it may be more liquid-impermeable as shown in FIG. 11 wide range of sex films. The reference number 13x in the figure represents the full width of the cover sheet 13. However, if the cover sheet 13 extends to the stretchable area A2, shrinkage wrinkles are also formed on the cover sheet 13. Therefore, the side ends of the cover sheet 13 are easily peeled off, or the wrinkles are noticeable, giving an unnatural appearance. On the other hand, if the cover sheet 13 is provided in the width direction range of the non-stretching area A1, there are few wrinkles in the whole range of the cover sheet 13, and it is excellent in aesthetics, so it is preferable. In addition, it is more preferable if the side edges of the cover sheet 13 are positioned closer to the center in the width direction than the position of the side edges of the absorbent 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, peeling may occur even if it is adhered to the opposing 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 risk of peeling, and there is also a concern that the step difference makes the skin feel worse. On the other hand, if the side end of the cover sheet 13 is located in the area with the absorbent member 50, that is, in the area where the rigidity is higher than the surrounding area and is not easily deformed and does not easily rub against the wearer's legs, the skin feel is not easily deteriorated. And, when the side end is adhered to the opposing surface, the adhesion is not easy to peel off. In addition, in order to form such a structure, it is necessary to provide liquid-impermeable sheets 11 such as the waterproof membrane 64 of the three-dimensional corrugated portion 60 mentioned above on the back side of both sides of the absorbent member 50 in the inner body 200, and make the installation The width of the liquid-impermeable sheet 11 on the outside of the exterior bodies 12F and 12B is narrowed.

The type of fiber used in the non-woven fabric of the cover sheet 13 or the method of processing the bonding (crosslinking) of the fibers are not particularly limited. The non-woven fabric of the same material as the outer body 12F, 12B can be appropriately selected, but it is desirable to use hot air Non-woven. In addition, 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 fabrics, the thickness of the cover sheet 13 may be thinner than the respective thicknesses of the inner sheet layer 12H and the outer sheet layer 12S. , But it is preferably thicker than the thickness of 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 orientation 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 longitudinal and transverse stretch elongation The ratio (or the aspect ratio of the 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, and the side ends of the cover sheet 13 are difficult to Peeling is therefore preferred. Regarding the cover sheet 13, it is preferable that the part that overlaps the liquid-impermeable sheet 11 or the area with the decorative printing 27 is a single layer, but in areas other than this, it can also be two layers, as shown in FIG. 22, for example. As shown, it may also be: by folding back both sides of the cover sheet 13 to the center side in the width direction WD or separately sticking a non-woven fabric to form a double-layer structure, the elastic member 13G is installed between the layers along the front-rear direction LD, This part can be expanded and contracted in the front-rear direction.

For the cover sheet 13, a non-porous non-woven fabric that does not have holes penetrating the front and back surfaces can be used. The air permeability is improved, and the visual confirmation of the decorative printing of the liquid-impermeable sheet also becomes good, which is preferable.

In the case of using a perforated nonwoven fabric for the cover sheet 13, it is possible to have an area where the holes 14 are not present in a portion of the cover sheet 13 in the front-rear direction LD. However, if the effect of improving the air permeability is considered, it is desirable to provide the entire front-rear direction.孔14. On the other hand, in the form in which both ends of the cover sheet 13 in the width direction WD have regions where the holes 14 are not present, if the holes 14 are opened by a method other than punching by a cutter, as will be described later, The fibers in the peripheral portion 14e of the hole 14 are retracted to the outside or in the vertical direction, and the peripheral portion 14e of the hole 14 is warped, so that the thickness of the porous area becomes thicker than the non-porous area. Therefore, the cover is stored in a rolled state In the case of the material of the sheet 13, the portion of the non-porous area is loosely wound, and there is a concern that wrinkles or creases may be formed in the non-porous areas on both sides. Therefore, it is desirable to form the hole 14 over the entire width direction WD as shown in the figure. In addition, by forming holes in the cover sheet 13 in the manufacturing step of the diaper, it is possible to use non-porous materials and arbitrarily control the formation position of the holes. However, there is a problem that the hole forming equipment is introduced. Therefore, the entire manufacturing becomes huge and the cost or maintenance burden increases. In addition, it is difficult to adjust the hole shape and flexibility in a high-speed production line. Therefore, it is preferable to use a material having holes formed in the entire front-rear direction and the entire width direction for production.

The planar shape (opening shape) of each hole 14 can be set appropriately. In addition to the elongated hole shape shown in Figure 17 (a) and Figure 17 (b), it can also be set as Figure 17 (c), A perfect circle as shown in FIG. 17(e), polygons such as an ellipse, triangle, rectangle, and rhombus as shown in FIG. 17(d), and arbitrary shapes such as a star shape and a cloud shape. The size of each hole 14 is not particularly limited. The maximum dimension 14L in the front-rear direction LD is preferably 0.4 to 1.8 mm, particularly preferably 0.8 to 1.3 mm, and the maximum dimension 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 shape that is long in one direction, such as a long hole, an ellipse, a rectangle, a rhombus, etc., the largest dimension in the longitudinal direction is preferably the largest dimension in the direction perpendicular to the longitudinal direction. 2.5 times or less. In addition, when the shape of the hole 14 is a shape that is long in one direction, it is desirable that the longitudinal direction of the hole 14 is the front-rear direction LD, but it may be the width direction WD or the oblique direction.

Regarding the area and area ratio of each hole 14 as long as it is appropriately determined, 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%).

Regarding the planar arrangement of the holes 14, it can be determined appropriately, but a regularly repeated planar arrangement is preferable, except for the diagonal lattice shape shown in FIG. 17(a) or the hexagonal lattice shape shown in FIG. 17(b) (These are also called staggered shapes), square grids shown in Fig. 17(c), rectangular grids shown in Fig. 17(d), parallel grids shown in Fig. 17(e) (as shown in the figure) , A plurality of groups of parallel oblique rows are arranged in two groups so as to cross each other), etc. (including the shape where the groups of these oblique rows are inclined at an angle of less than 90 degrees with respect to the front-rear direction LD). In addition to the ground repetition, the group of holes 14 (the arrangement of the group unit may be regular or irregular, and may also be a pattern or a character shape, etc.) may be regularly repeated.

Regarding the front-rear direction interval 14y and the width direction interval 14x of the holes 14, they can be determined appropriately, but considering the air permeability, it is desirable to set them in the range of 0.5-8mm, and it is particularly desirable to set them in the range of 1-5mm. Inside, if the front-rear 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 into a shape elongated in the front-rear direction LD, and the front-rear direction interval is narrower than the maximum dimension 14L in the front-rear direction LD of the hole 14 The rows of holes 14 arranged in the front-rear direction 14y are repeated at predetermined intervals in the width direction WD, and the width-wise interval 14x of the holes 14 is larger than the maximum dimension 14L in the front-rear direction LD of the holes 14 (more preferably 3 times or more of the 14W dimension in the width direction), the air permeability can be significantly improved without compromising flexibility or bulkiness. In addition, the sheet tensile strength in the front and rear directions, which is important during manufacturing, does not decrease, so it is Preferred.

The cross-sectional shape of the hole 14 may be any of the following methods: The first method, in which, as shown in Figs. 14(a)-14(c), the thickness of the non-woven fabric approaches the hole 14 from 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; the second method, in which, as shown in Figure 15 (a)-Figure 15 (c), the peripheral portion 14e of the hole 14 is warped to the front side And the warped height 14h is approximately uniform; and, the third mode, in which, as shown in FIGS. 16(a)-16(c), the peripheral portion 14e of the hole 14 is warped toward the front side, and the peripheral portion 14e has The opposite part with the highest lift height 14i and the part with the lowest lift height 14j, wherein the part with the lowest lift height 14j is opposed to the opposite part with the highest lift height 14i The opposite part. From the viewpoint of improving air permeability, it is desirable to have the second method and the third method in which the portion of the hole 14 is thicker than the surroundings. In particular, in the third method, due to the raised height 14i, 14j of the peripheral portion 14e of the hole 14 The gap formed by the difference helps to improve the air permeability and is therefore preferable. In the second and third aspects, the lift heights 14h, 14i, 14j (apparent heights measured with an optical microscope in a state where no pressure is applied) are preferably about 0.2 to 1.2 mm, In the third aspect, the highest tilting height 14i is preferably about 1.1 to 1.4 times the lowest tilting height 14j.

The hole 14 may be a punched hole with the edge formed by the cut end of the fiber, or it may be a non-punched hole (high fiber density in the surrounding portion): there is almost no fiber cut at the edge of the hole 14 The non-punched hole is formed by inserting a needle between the fibers to expand. The former is suitable for the above-mentioned first method, and the latter is suitable for the above-mentioned second and third methods. For example, if a hole 14 having a shape that is long in one direction is formed by inserting a needle, the fibers in the peripheral portion 14e of the hole 14 are retracted outward or in the vertical direction, so that the peripheral portion 14e of the hole 14 is warped, and, The raised height 14i of the opposed portion in the longitudinal direction of the hole 14 is higher than the raised height 14j of the opposed portion in the direction perpendicular to the longitudinal direction. In the second and third methods described above, the edge portion of the portion where the peripheral portion 14e of the hole 14 is raised to the surface may have a fiber density lower than that of the surrounding portion, but it is preferably equal or higher. . In addition, it is desirable that the fibers in the peripheral portion 14e of the hole 14 are welded together, but they may not be welded together.

Regarding the inner surface of the cover sheet 13, when the front and rear 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 bonded to the non-woven fabric by the hot melt adhesive 13H. For the liquid-permeable sheet 11 (for a form in which the widthwise range is the same, refer to FIG. 10), when the cover sheet 13 is larger than the liquid-impermeable sheet 11 as shown in FIG. 3, the inner surface of the cover sheet and The overlapped portion of the liquid-impermeable sheet 11 is bonded to the liquid-impermeable sheet 11 by a hot-melt adhesive 13H, and the portion of the inner surface of the cover sheet that extends from the liquid-impermeable sheet 11 is hot-melted The adhesive 13H is bonded to the exterior body.

Regarding the cover sheet 13, in the main area except the front and rear ends (2-10mm), at least both side ends, preferably the entire width direction WD is bonded to the opposite surface. In this case, the cover sheet 13 The side end is adhered to the facing surface, and therefore, the boundary is seamlessly integrated without being conspicuous, 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 a non-woven fabric and the positions of the side edges of the liquid-impermeable sheet 11 coincide with the positions of the side edges of the cover sheet 13, the inner surface of the cover sheet 13 is in addition to In the area other than the front and rear ends, at least both ends are bonded to the liquid-impermeable sheet 11 by the hot-melt adhesive 13H, and, for the inner surface of the liquid-impermeable sheet 11, in addition to In the area other than the front and rear ends, at least both side ends are bonded to the exterior bodies 12F, 12B by the hot-melt adhesive 11H. In this case, both side ends of the cover sheet 13 are made of resin film. The liquid-impermeable sheet 11 is adhered to the outer side sheet layer 12S made of a non-woven fabric, and therefore the bonding between the both side ends of the cover sheet 13 and the outer sheet layer 12S becomes firm.

In the case of the cover sheet 13 with the hole 14, a preferred bonding structure is: as shown in Figure 18 (a)-Figure 18 (d), at least one of the inner surface and the outer surface of the cover sheet 13 is adhered In the bonding area, the hot-melt adhesive 13H does not exist on the central side of the peripheral edge portion 14i of the area overlapping the hole 14, and the hot-melt adhesive 13H is continuous outside the peripheral edge portion 14i of the area overlapping the hole 14 Faceted existence. Since there is no hot-melt adhesive 13H at the center side of the peripheral edge portion 14i of the region overlapping the hole 14, the air permeability is excellent. In addition, there is such an adhesive structure only on the surface opposite to the surface in contact with the skin, and the part with such an adhesive structure is unlikely to produce a sticky skin feel due to the hot-melt adhesive 13H , And the peripheral portion 14e of the hole 14 is reliably fixed to the opposing surface.

As a representative bonding state, the following state can be exemplified: as shown in Figure 18 (a) and Figure 18 (b), there is no hot-melt adhesive 13H in the area overlapping the hole 14, and the Outside the area where 14 overlaps, the hot-melt adhesive 13H is present in a continuous plane; and, as shown in Figure 18(c) and Figure 18(d), the hot-melt adhesive 13H is on the periphery of the area where the hole 14 overlaps. The portion 14i overflows, but the hot-melt adhesive 13H does not exist on the central side of the peripheral portion 14i of the area overlapping the hole 14, and the hot-melt adhesive 13H is outside the peripheral portion 14i of the area overlapping the hole 14 Exists as 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 latter is heated The fusion adhesive 13H overflows in this part, but at the part where only the surface on the opposite side of the skin contacting surface is bonded, when the cover sheet 13 is touched with the surface on the opposite side to the adhesive surface by hand, There is almost no direct contact with the hot melt adhesive 13H. In addition, 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 half of the thickness of the cover sheet 13 and less than about 0.5 mm. In addition, it is desirable that the hot-melt adhesive 13H does not exist 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. However, 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, it will not be liquid-impermeable. The pore diameter observed from the liquid-impermeable sheet 11 side is smaller than the pore diameter observed from the surface on the opposite side of the sheet 11 side. Therefore, it is not easy to touch the hot-melt adhesive 13H at the part 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 adhesive surface is touched by hand. In addition, the warped portion supports the cover sheet 13 with respect to the facing surface like a support column, and therefore becomes bulkier compared to a non-porous non-woven fabric of the same basis weight, and is also more excellent in air permeability. In addition, since the adhesion between the cover sheet 13 and the liquid-impermeable sheet 11 in the area other than the peripheral portion 14e of the hole 14 is likely to float (although it is depicted as hot melt in Figure 18 (a)-Figure 18 (d) Adhesive 13H fills the space between the sheets without gaps, but the substantial amount of application is small, and gaps are likely to occur). Therefore, the surrounding portion 14e of the hole 14 is reliably bonded, and it becomes non-existent in other areas. Complete bonding (the substantial bonding area is small), so that excellent softness and softness can be obtained.

Such a bonding structure can be manufactured by the following method: without using air, the hot-melt adhesive is applied to the bonding surface of the porous non-woven fabric in a continuous surface, and the opposite surface is bonded together . This method is based on the following new discovery: If the hot-melt adhesive is applied to the bonding surface of the porous non-woven fabric in a continuous surface without using air, it will be heated due to heat before bonding to the opposing surface. For the surface tension of the fusion adhesive, an opening (hole) is opened in the center of the part of the hot fusion adhesive that overlaps the hole of the perforated nonwoven fabric, and the opening is expanded to the periphery of the hole of the perforated nonwoven fabric. That is, if such a bonding method is adopted, as shown by the change shown by the arrow in FIG. 19, after the hot melt adhesive 13H is applied to the porous non-woven fabric in a continuous plane and before being bonded to the target member, Due to the surface tension of the hot-melt adhesive 13H, an opening (hole) h is opened in the center of the portion of the hot-melt adhesive 13H that overlaps the hole 14 of the perforated nonwoven fabric, and the opening h is expanded to the hole 14 of the perforated nonwoven fabric. The surrounding part 14e. Therefore, after the perforated non-woven fabric is bonded to the target part, as shown in Figs. 18(a) to 18(d), there is no hot-melt adhesive 13H in most of the holes 14 and neither Since the hot-melt adhesive 13H falls off or oozes from the hole 14 due to air, it is not easy to produce a sticky skin feel when touching the surface on the opposite side of the adhesive surface by hand.

As a hot-melt applicator that applies hot-melt adhesive in a continuous surface without using air, it can be suitably used: slit coating, which makes the application head (die) and the perforated non-woven fabric bonded In surface contact, the hot melt adhesive is extruded and applied from the gap in the CD direction (direction perpendicular to the MD direction (the conveying direction of the manufacturing line)) provided at the end of the coating head; or non-contact type slit type For coating, the hot melt adhesive is extruded from the gap in the CD direction provided at the end of the coating head with the coating head (die) floating from the bonding surface of the perforated nonwoven fabric, and The difference in the conveying speed of the perforated non-woven fabric causes the hot melt adhesive to extend and coat it into an extremely thin film.

The bonding conditions can be appropriately determined. However, in order to make the hot melt adhesive 13H superimposed on the hole 14 move to the peripheral portion 14e of the hole 14 quickly and firmly adhere to the peripheral portion 14e of the hole 14, it is desirable to satisfy the following conditions At least one of them.

The melt viscosity of the hot melt adhesive (temperature 140℃): 3000~2600mPa. s

The melt viscosity of the hot melt adhesive (temperature 160℃): 1150~1550mPa. s

Temperature when hot melt adhesive is applied to porous non-woven fabric: 110~150℃

Application amount of hot melt adhesive for porous non-woven fabric: 1.0~8.0g/m ²

Open time after application of hot melt adhesive: 0.1~1.0 seconds

<Other forms>

As shown in Figures 23 to 25(b), it is also possible to use the conventional structure in which the liquid-impermeable sheet 11 is attached to the inner body 200, and at the same time pass through the outer sheets of the outer body 12F, 12B. The outer portion of the layer 12S is provided with a cover piece 13 extending in the front-rear direction. In the case where the decorative printing 27 is provided on the liquid-impermeable sheet 11 in this form, if the exterior two-part structure is adopted as shown in the figure, and the part of the liquid-impermeable sheet 11 with the decorative printing 27 is outside the front side The body 12F and the rear exterior body 12B are exposed at the part separated in the front-rear direction LD, and at the part covered by the cover sheet 13, the decorative print 27 can be seen through only the cover sheet 13, so The visibility of the decorative printing 27 of the liquid-impermeable sheet 11 can be improved. In addition, since the cover sheet 13 extends at least from the front exterior body 12F to the rear exterior body 12B in the front-rear direction LD, it has a continuous appearance and skin feel throughout the front exterior body 12F and the rear exterior body 12B. .

As shown in Figures 23 to 25(b), while adopting the conventional structure in which the liquid-impermeable sheet 11 is attached to the inner body 200, it passes through the outer sheet layer 12S in the outer body 12F, 12B. When the cover sheet 13 extending in the front-rear direction is provided in the position, it is not necessary for the cover sheet 13 to cover the liquid-impermeable sheet 11 to the portion of the liquid-impermeable sheet 11 covered by the exterior bodies 12F and 12B. As shown in Figure 25 (a) and Figure 25 (b), the front edge of the cover sheet 13 is positioned behind the front edge of the absorbent member 50, and the rear edge of the cover sheet 13 is positioned behind the absorbent member 50. The position of the edge on the front side is also a preferred way. That is, if the front edge and the rear edge of the cover sheet 13 are located in a portion with low rigidity or are easily deformed, they are easily separated from the facing surface, and even if they are adhered to the facing surface, there is a possibility of peeling. In addition, if the front edge and the rear edge of the cover sheet 13 are separated or peeled off from the facing surface, the wrinkles in the boundary portion between the cover sheet 13 and the exterior body are likely to become conspicuous and have an unnatural appearance. In contrast, if the front and rear edges of the cover sheet 13 are located in the area with the absorbing member 50, that is, the area where the rigidity is higher than the surrounding area and is not easily deformed, it is difficult to separate or peel off from the facing surface, thereby preventing the following Situation: The wrinkles in the boundary portion between the cover sheet 13 and the outer sheet layer 12S become noticeable and have an unnatural appearance.

Regarding the decorative printed sheet, in addition to only the liquid-impermeable sheet 11, it may be replaced by the design of providing the decorative print 27 on the liquid-impermeable sheet 11, or the decorative print 27 may be provided in the liquid-impermeable sheet 11. At the same time as the sheet 11, as shown in FIGS. 23 to 25(b), a printed sheet 25 dedicated for decoration is provided at an appropriate position. The reference numeral 25H denotes a hot-melt adhesive for bonding the printed sheet 25. The position where the printed sheet 25 is provided is not particularly limited, but, for example, as shown in the figure, if it is formed in a form in which the printed sheet 25 is provided on the outer side of the outer sheet layer 12S in the exterior bodies 12F and 12B If the cover sheet 13 is further adhered to the outside, the cover sheet 13 covers almost the entire portion of the printed sheet 25 with decorative printing, and the visual confirmation of the decorative printing becomes excellent.

The base material of the printing sheet 25 is not particularly limited as long as it is suitable for printing. For example, paper such as crepe paper, a resin film, or the like can be used. In the case of using crepe paper, the thickness is preferably 100 to 150 μm, and the density is preferably 100 to 200 kg/m ³ . Crepe paper of such a thickness and density can be manufactured by setting the weight per unit area to 10 g/m ² or more and setting the crepe rate to about 10%. And, the density can be calculated based on the weight and thickness per unit area. In addition, the crepe rate is a value calculated based on ((circumferential speed of the Yankee dryer)-(circumferential speed of the take-up reel))/(circumferential speed of the Yankee dryer)×100 (%). As the decorative printing of the printed sheet 25, it is possible to use decorative patterns (including figures in paintings and single-dot patterns), use methods or use aids, size and other function display, or manufacturer or product name, feature function and other identification display, etc. Appropriate decorative printing.

<About the manufacturing method> The structure in which at least both side ends of the cover sheet 13 are bonded by the hot-melt adhesive 13H can be manufactured in accordance with the manufacturing method shown in FIG. 20(a) and FIG. 20(b), for example. That is, the manufacturing method includes the outer body assembly step not shown, the elastic member cutting step 301, the inner body mounting step 302, the cover sheet bonding step 303, the waist folding step 304, the not shown folding step, and the not shown. The side joining and cutting off step shown in the figure. In addition, FIG. 20(a) is a flowchart of the manufacturing facility, and FIG. 20(b) is a plan view showing the change of the assembled state, and the two figures are drawn in correspondence.

In the step of assembling the exterior body, one sheet continuous in the MD direction is folded in the CD direction or two sheets continuous in the MD direction are pasted by sandwiching the elastic member continuously supplied in the MD direction. Together, a band-shaped exterior body 120 with elastic members interposed between the inner sheet layer and the outer sheet layer is thus formed. In the belt-shaped exterior body 120, the part which becomes an exterior body repeats and continues in the MD direction so that the width direction WD may correspond to the MD direction in a manufacturing line. In the illustrated form, there are separately formed: a strip-shaped exterior body 120 that includes a portion that becomes the two-parted front exterior body 12F of the exterior exterior; and a strip-shaped exterior body that includes a portion that becomes the rear exterior body 12B. The exterior body 120, however, in the case of an exterior integrated type, there may be one band-shaped exterior body 120.

Next, the elastic member cutting step 301 is performed on the formed belt-shaped exterior body 120 as needed, with a predetermined interval in the MD direction, and a cutting device 310 such as thermal embossing is used to place the back and the interior The elastic member 121 at the portion CT where the body 200 overlaps is cut, and the contraction force of the elastic member 121 is in a state in which the contraction force of the elastic member 121 does not substantially act at this portion CT.

In the inner body mounting step 302, while the belt-shaped outer body 120 is conveyed in parallel in the CD direction at intervals in the same arrangement as the unfolded state of the diaper, the belt-shaped outer body 120 is conveyed simultaneously in parallel by a known method by other manufacturing lines. The manufactured inner body 200 in the expanded state is sequentially joined to the parts of the belt-shaped outer body 120 that become the respective outer bodies, thereby forming the following inner assembly: the parts that become the individual diapers are in the expanded state Continuous in MD direction. These joining and fixing can be performed by suitable means such as hot melt adhesive.

In the cover sheet bonding step 303, the cover sheet 13 is bonded to the surface of the belt-shaped outer body 120 on the opposite side to the bonding surface of the inner body 200 at intervals in the MD direction. The cover sheet bonding step 303 only needs to be before the folding step. However, since the cover sheet 13 extends from the front body F to the back body B, in the case of an exterior two-part type as shown in the figure, it includes: After the positional relationship between the belt-shaped outer body 120 of the front outer body 12F and the belt-shaped outer body 120 including the part of the rear outer body 12B is determined, that is, the inner body After the body mounting step 302 is preferred.

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

The steps after this are not shown in the figure, but a shorts-type disposable diaper can be manufactured by a known method. That is, in the folding step, the interior assembly body with the interior body 200 and the cover sheet 13 attached to the belt-shaped exterior body 120 is folded in half in the CD direction, thereby forming a double-folded belt-like body. In the joining and cutting-off step, the outer covering body of the front body and the outer covering body of the back body are joined together at the portions of the diapers in the double-folded belt-shaped body that become both sides, and the front body is joined at the boundary of each diaper The outer body and the outer body of the back body are cut to obtain each diaper.

It is characterized in that, in the cover sheet bonding step 303, while conveying the belt-shaped body 130 of the continuous belt-shaped cover sheet along its continuous direction, it borrows on the bonding surface facing the belt-shaped exterior body 120. The hot-melt adhesive is continuously applied in the MD direction by the coating device 312, and then cut into individual cover sheets 13 at intervals in the MD direction by the sliding blade 311, and cut at intervals in the MD direction The cut cover piece 13 is adhered to the surface of the band-shaped exterior body 120 on the opposite side to the joining surface of the interior body 200. As a result, except for the front and rear ends of the cover sheet 13, the hot melt adhesive can be continuously applied to the right side edges of the cover sheet 13 in the width direction WD, and there can be no overflow of the hot melt adhesive. The side ends of the cover sheet 13 are firmly adhered to the opposite surface.

In particular, as shown in the figure, a form in which the following resin film bonding step 305 is added before the cover sheet bonding step 303 is a preferred mode: a liquid impermeable sheet made of a resin film that has been decorated and printed The strip-shaped body 111 is continuously adhered to the bonding surface of the strip-shaped body 130 of the cover sheet facing the strip-shaped exterior 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-shaped body 130 of the cover sheet that is bonded to the band-shaped body 111 of the liquid-impermeable sheet. Thus, in the cover sheet bonding step 303, the hot melt adhesive is continuously applied to the cover sheet of the band 111 to which the liquid-impermeable sheet is bonded by the coating device 312 in the MD direction. The adhesive surface of the belt-shaped body 130 facing the belt-shaped exterior body 120 is then cut into each cover sheet 13 and the liquid-impermeable sheet 11 at intervals in the MD direction using a sliding knife 311, and the The cut cover sheet 13 and the liquid-impermeable sheet 11 are adhered to the surface of the belt-shaped exterior body 120 on the opposite side to the joint surface of the interior body 200 at intervals in the MD direction. In this case, the side edges of the cover sheet 13 in the product coincide with the side edges of the liquid-impermeable sheet 11. In this form, after the strip-shaped body 111 of the liquid-impermeable sheet composed 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 strip-shaped exterior body 120. Therefore, , The rigidity of each cover sheet 13 after cutting is increased corresponding to the resin film, and the air permeability is significantly reduced. Therefore, the sliding blade 311 is sucked and held as shown by the arrow in the figure. When the body 120 is intermittently pasted, the shape and suction retention are stable, and stable pasting can be achieved.

Although not shown in the figure, it may be that instead of adhering the strip 111 of the liquid impermeable sheet to the strip 130 of the cover sheet, it can be adhered to the strip outer body 120 before the cover sheet 13 is adhered. The liquid-impermeable sheet 11 is attached, and the cover sheet 13 is adhered from the liquid-impermeable sheet. In addition, in the case where the liquid-impermeable sheet 11 is provided on the back side of the absorbent member in the inner body 200, the liquid-impermeable sheet 11 can be adhered in the manufacturing step of the inner body 200 (not shown). The step of sticking the liquid-impermeable sheet 11 to the belt-shaped body 130 or the belt-shaped exterior body 120 of the cover sheet is omitted.

When the cover sheet 13 is a perforated non-woven fabric, a pre-processed perforated non-woven fabric can be used as the cover sheet 13, but in order to reduce the material cost, processing on the manufacturing line is preferable. However, in the case of perforating a nonwoven fabric, the faster the processing line speed, the more difficult it is to perform high-precision processing stably. In contrast, in the cover sheet bonding step 303 of the manufacturing method of the illustrated form, the supply speed of the cover sheet ribbon 130 to the cover sheet bonding step 303 is slowed due to the cutting and intermittent bonding. If, as shown in the figure, the punching device 314 is added to the supply line for supplying the band-shaped body of the cover sheet 13 to the cover sheet bonding step 303, and the punching step 306 for the cover sheet 13 is performed, stable punching processing can be realized. Therefore preferred.

<Explanation of terms in the specification> Unless otherwise stated in the specification, the following terms in the specification have the following meanings.

・"Front-to-back (longitudinal) direction" refers to the direction connecting the abdomen (front) and back (rear) side, and "width direction" refers to the direction (left-right direction) perpendicular to the front-to-rear direction.

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

・"Fiber orientation" is the direction along which the fibers of the nonwoven fabric follow, and can be determined by, for example, the following measurement method: According to the measurement method of the fiber orientation test method, the fiber orientation test method is based on the TAPPI standard method T481 A test method for zero-distance tensile strength; or a simple measurement method for determining the direction of fiber alignment based on the ratio of the tensile strength in the front-to-rear 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 component that is close to the wearer's skin when wearing shorts-type disposable diapers, and "back" refers to the side farther from the wearer's skin when wearing shorts-type disposable diapers.

・"Area ratio" refers to the ratio of the target part to the unit area, and is the ratio of the total area of the target part (for example, hole) in the target area (for example, cover sheet) divided by the area of the target area and expressed as a percentage. In the method in which a plurality of target parts are provided at intervals, it is desirable that the target area is set for a size including 10 or more target parts, and the area ratio is obtained. For example, for the area ratio of the holes, for example, a device under the trade name of VHX-1000 from KEYENCE Corporation can be used, the measurement condition is set to 20 times, and the measurement can be performed in the following procedure. (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 the color extraction of "Area Measurement" of "Measurement and Comment". Click on the part of the hole. (4) Click "Measure together" and select "Display measurement result window" to save as CSV data.

・"Elongation" refers to the value when the natural length is set to 100%.

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

・"Weight per unit area" is measured as follows. After pre-drying the sample or test piece, place it in a test room or device in a standard state (the temperature of the test site is 20±5°C, and the relative humidity is below 65%) to make it into a constant state. Preliminary drying means to make the sample or test piece constant in an environment with a relative humidity of 10-25% and a temperature of not more than 50°C. In addition, pre-drying is not necessary for fibers with a legal moisture content of 0.0%. Using the sample selection template (200mm×250mm, ±2mm), cut a sample with a size of 200mm×250mm (±2mm) from the test piece in a constant state. Measure the weight of the sample and calculate the weight per square meter 20 times as the weight per unit area.

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

・Water absorption is measured in accordance with JIS K7223-1996 "Test Method for Water Absorption of Super Absorbent Resin".

・The water absorption speed is the "time to the end point" when JIS K7224-1996 "Test Method for Water Absorption Speed of Super Absorbent Resins" is carried out using 2 g of super absorbent polymer and 50 g of physiological saline.

・"Expanded state" refers to a state that is flat and unfolded without shrinking or slack.

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

・In the absence of a description of the environmental conditions in the test or measurement, the test or measurement is performed in a test room or device in a standard state (the test site is at a temperature of 20±5°C and a relative humidity of 65% or less) .

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

11‧‧‧Impermeable sheet 12A‧‧‧Side seal 12B‧‧‧Back exterior body 12F‧‧‧Front exterior body 12H‧‧‧Inner sheet 12S‧‧‧Outer sheet 13‧‧ ‧Cover sheet 14‧‧‧Hole 17‧‧‧Waist elastic part 18‧‧‧Excess elastic part 200‧‧‧Inner body 201,202‧‧‧Internal and external joint 27‧‧‧Decorative printing 30‧‧‧Top sheet 301‧‧‧Elastic component cutting step 302‧‧‧Inner body installation step 303‧‧‧Cover sheet bonding step 304‧‧‧Waist folding step 305‧‧‧Resin film bonding step 306‧‧‧Perforating step 40 ‧‧‧Intermediate sheet 50‧‧‧Absorbent member 56‧‧‧Absorbent 58‧‧‧Packing sheet 60‧‧‧Three-dimensional folds 60A‧‧‧End side part 60B‧‧‧Root side part 62‧‧‧Wrinkles Pleated non-woven fabric 67‧‧‧Lodging part A1‧‧‧Non-stretching area A2‧‧‧Stretching area B‧‧‧Back body C‧‧‧Hip cover part F‧‧‧Front body L‧‧‧Middle area LD‧‧‧ Front and back direction T‧‧‧Waist area U‧‧‧Lower waist W‧‧‧Waist WD‧‧‧Width direction WO‧‧‧Waist opening 25‧‧‧Printing sheet

Fig. 1 is a plan view showing the inner surface of the shorts-type disposable diaper in an unfolded state. Fig. 2 is a plan view showing the outer surface of the shorts-type disposable diaper in an unfolded state. Fig. 3 is a cross-sectional view taken along line 2-2 in Fig. 1. Fig. 4 is a cross-sectional view taken along line 3-3 in Fig. 1. Fig. 5(a) is a cross-sectional view taken along the line 4-4 in Fig. 1 and Fig. 5(b) is a cross-sectional view taken along the line 5-5 in Fig. 1. Fig. 6 is a perspective view of a shorts-type disposable diaper (with holes omitted). Fig. 7 is a plan view showing the outer surface of the inner body in an unfolded state. Fig. 8 is a plan view showing the outer surface of the inner body in an unfolded 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 the outer surface of the shorts-type disposable diaper in an unfolded state. Fig. 12 is a plan view showing the outer surface of the shorts-type disposable diaper in an unfolded state. Fig. 13(a) is a cross-sectional view taken along line 4-4 in Fig. 12, and Fig. 13(b) is a cross-sectional view taken along line 5-5 in Fig. 12. Fig. 14(a) is a perspective view showing the holes of the perforated nonwoven fabric, Fig. 14(b) is a plan view showing the holes of the perforated nonwoven fabric, and Fig. 14(c) is along line 8-8 in Fig. 14(b) Cutaway view. Fig. 15(a) is a perspective view showing the holes of the perforated nonwoven fabric, Fig. 15(b) is a plan view showing the holes of the perforated nonwoven fabric, and Fig. 15(c) is along the line 8-8 in Fig. 15(b) Cutaway view. Fig. 16(a) is a perspective view showing the holes of the perforated nonwoven fabric, Fig. 16(b) is a plan view showing the holes of the perforated nonwoven fabric, and Fig. 16(c) is along line 8-8 in Fig. 16(b) Cutaway view. Figure 17 (a)-Figure 17 (e) is an enlarged plan view of the important part of the perforated non-woven fabric. 18(a) and 18(c) are cross-sectional views of the adhesive part of the cover sheet, and FIGS. 18(b) and 18(d) are plan views of the adhesive part of the cover sheet. Fig. 19 is a plan view showing the change of the hot-melt adhesive during application. 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) and Fig. 21(b) are both exploded and assembled views showing important parts of the laminated structure. Fig. 22 is an exploded assembly view showing important parts of the laminated structure. Fig. 23 is a cross-sectional view taken along line 2-2 in Fig. 1. Fig. 24 is a cross-sectional view taken along line 3-3 in Fig. 1. Fig. 25(a) is a cross-sectional view taken along line 4-4 in Fig. 1, and Fig. 25(b) is a cross-sectional view taken along line 5-5 in Fig. 1.

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11‧‧‧Impermeable film

13‧‧‧Mask

200‧‧‧Interior body

30‧‧‧Top Film

40‧‧‧Intermediate film

50‧‧‧Absorbing member

56‧‧‧Absorber

58‧‧‧Packing film

60‧‧‧Three-dimensional wrinkles

60A‧‧‧End side part

60B‧‧‧Root side part

62‧‧‧Wrinkle non-woven fabric

Claims (11)

A shorts-type disposable diaper, comprising: an outer body that constitutes at least the waist area of the front body and at least the waist area of the back body; and, an inner body with an absorbent member built-in, which extends from the front body to the back body Mounted on an exterior body; the exterior body has: an elastic member; an inner sheet layer adjacent to the inner side of the elastic member; and, an outer side sheet layer adjacent to the outer side of the elastic member; and, the front body Both sides of the outer body and the both sides of the outer body of the back 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 shorts The disposable diaper has a cover sheet composed of a non-woven fabric, and the cover sheet passes through the center side in the width direction than the position of both side edges of the absorbent member and is closer to the outer sheet layer in the outer body. The outer part extends in the front-rear direction, and the part outside the width direction than the position of the both side edges of the absorbent member and outside the outer sheet layer in the exterior body does not have the Non-woven fabric other than the cover sheet, and the inner surface of the cover sheet, in the area other than the front and rear ends, at least two side ends are bonded to the inner sheet layer on the opposing surface by a hot melt adhesive The outer sheet and the outer sheet are non-woven fabrics, and the fiber alignment of the inner sheet, the outer sheet and the cover sheet is the width direction. The shorts-type disposable diaper described in claim 1, wherein: The front edge of the cover sheet is located on the rear side of the front edge of the absorption member, and the rear edge of the cover sheet is located on the front side of the rear edge of the absorption member. The shorts-type disposable diaper according to claim 1, wherein the cover sheet extends toward the waist opening on at least one of the front body and the back body, and is folded back toward the inner side of the inner sheet layer at the waist opening. The shorts-type disposable diaper according to claim 1, wherein the outer body has: a non-stretchable area provided in a widthwise middle portion of an area overlapping the absorbent member; and a stretchable area, which Are provided on both sides of the non-stretching area in the width direction; and the cover sheet is provided within the width direction of the non-stretching area. The shorts-type disposable diaper according to claim 1, wherein a decorative printed sheet is interposed between the outer sheet layer of the outer body and the cover sheet, and the decorative printed sheet has Decorative printing adjacent to the inner surface of the cover sheet. The shorts-type disposable diaper according to claim 1, wherein the shorts-type disposable diaper includes at least a waist front side outer covering forming a front body and at least a waist rear outer covering forming a back body formed separately from each other As the exterior body, the front exterior body and the rear exterior body are separated in the front-rear direction in the middle of the front-rear direction, and the interior body has liquid impermeability covering the back side of the absorbent member Sheet, the liquid-impermeable sheet has an exposed part, and the exposed part is in the inner At least the widthwise middle portion of the back of the package body is exposed, the liquid-impermeable sheet is a decorative printed sheet, and the decorative printed sheet is located between the front exterior body and the rear exterior body in the exposed portion There is decorative printing in the area, and the cover sheet extends at least from the front exterior body to the rear exterior body in the front-rear direction. The shorts-type disposable diaper according to claim 1, wherein the inner sheet layer and the outer sheet layer are non-woven fabrics, and the thickness of the cover sheet is thicker than the thickness of each of the inner sheet layer and the outer sheet layer. The shorts-type disposable diaper according to claim 1, wherein the cover sheet is a perforated non-woven fabric in which a plurality of holes penetrating the front and back surfaces are provided at intervals. A method for manufacturing a shorts-type disposable diaper, which is the method for manufacturing a shorts-type disposable diaper according to claim 1, wherein the method for manufacturing the shorts-type disposable diaper includes: an outer body assembly step, which A belt-shaped exterior body is formed. On the belt-shaped exterior body, the part that becomes the exterior body repeats and continues in the MD direction so that its width direction coincides with the MD direction; the interior body installation step has one side The belt-shaped exterior body is conveyed so that the width direction of the diaper becomes the MD direction, and the separately manufactured interior body in the unfolded state is sequentially joined to the belt-shaped exterior body to form individual exterior bodies. The part of the body, thus forming a kind of interior assembly that becomes the part of each diaper in the unfolded state and is continuous in the MD direction; The step of adhering the cover sheet, in which the cover sheet is adhered to the surface of the belt-shaped outer body on the side opposite to the joint surface of the inner body at intervals in the MD direction; folding; Step, which folds the inner assembly in the CD direction, thereby forming a double-folded belt-shaped body; and, the side joining and cutting-off step, where each diaper in the double-folded belt-shaped body becomes both sides The outer body of the front body and the outer body of the back body are joined together, and the outer body of the front body and the outer body of the back body are cut at the boundary of each diaper. Each diaper; and, in the cover sheet bonding step, while conveying the belt-shaped body of the continuous cover sheet in the continuous direction, the hot-melt adhesive is continuously applied in the MD direction On the adhesive surface of the band-shaped body of the cover sheet facing the band-shaped exterior body, the band-shaped body of the cover sheet is cut into individual cover sheets at intervals in the MD direction, and The cut-out cover sheet is adhered to the surface of the belt-shaped exterior body on the opposite side to the joining surface of the interior body at intervals in the MD direction. The method for manufacturing a shorts-type disposable diaper according to claim 9, wherein a resin film bonding step is provided before the cover sheet bonding step, and in the resin film bonding step, the resin that has been decorated with printing is applied The film is adhered to the bonding surface of the tape-shaped body of the cover sheet facing the tape-shaped exterior body, and, in the bonding step of the cover sheet, the heat is continuously melted in the MD direction The adhesive is applied to the adhesive surface facing the belt-shaped exterior body in the belt-shaped body of the cover sheet to which the resin film is bonded, and then, in the MD The band-shaped body of the cover sheet is cut into individual cover sheets at intervals in the direction, and the cut cover sheet is adhered to the band-shaped exterior body at intervals in the MD direction The surface on the side opposite to the joining surface of the inner body. The method for manufacturing a shorts-type disposable diaper according to claim 9 or 10, wherein a perforation step is provided before the cover sheet bonding step, and in the perforation step, it is supplied to the cover sheet bonding step On the supply line of the strip-shaped body of the cover sheet, a plurality of holes penetrating the front and back surfaces are formed in the cover sheet at intervals.

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