CN105997361B

CN105997361B - Pants-type disposable diaper and method for producing same

Info

Publication number: CN105997361B
Application number: CN201610157046.3A
Authority: CN
Inventors: 大野阳平
Original assignee: Daio Paper Corp
Current assignee: Daio Paper Corp
Priority date: 2015-03-30
Filing date: 2016-03-18
Publication date: 2020-08-11
Anticipated expiration: 2036-03-18
Also published as: CN205612635U; CN105997361A; JP2016189820A; JP6057355B2; WO2016158499A1

Abstract

The invention provides a pants-type disposable diaper and a method for manufacturing the same, which can prevent the deterioration of the aesthetic property of a display sheet caused by the cutting trace of an elastic expansion member. When forming the outer body (12), elastic stretchable members (15, 16, 19) and a display sheet (25) are attached between the inner sheet layer (12H) and the outer sheet layer (12S) to form a stretchable region (A2) and a non-stretchable region (A1), wherein the display sheet has a thickness of 50 to 200 [ mu ] m and a density of 50 to 400kg/m³The elastic stretchable member (15, 16, 19) is cut by holding and pressing the inner sheet layer (12H) and the outer sheet layer (12S) from the inside thereof and heating the pressed portion only from the inside of the inner sheet layer (12H) at a portion to be a non-stretchable region (A1).

Description

Pants-type disposable diaper and method for producing same

Technical Field

The present invention relates to a pants-type disposable diaper including a display sheet on which a pattern or the like is printed, and a method for manufacturing the same.

Background

Pants-type disposable diapers generally include: an exterior body which constitutes a front body part and a rear body part separately or integrally; and an inner body including an absorber, which is attached to an inner surface of the outer body so as to extend from the front body portion to the back body portion, wherein both side edges of the outer body of the front body portion and both side edges of the outer body of the back body portion are joined to form side seals, thereby forming a waist opening and a pair of left and right leg openings.

In such a pants-type disposable diaper, in order to improve the fit to the body, the outer body is formed in a laminated structure having a plurality of sheet layers, and various elastic stretchable members are attached between the sheet layers in an extended state, wherein the fit to the body is relatively high in the following structure: in a waist region defined as a range in the front-rear direction corresponding to the side seal or in an intermediate region between the front and rear waist regions, an elongated elastic member extending in the width direction is attached at a distance in the front-rear direction and is stretched in the width direction (see, for example, patent document 1).

The waist region or the middle region overlaps with a range in the front-rear direction in which the absorbent body is provided, and an inner and outer fixing portion for fixing the interior body to the exterior body is provided in this range. Therefore, even if the elastic stretchable member is provided so as to cross the range in the front-rear direction having the absorbent body, the stretching function thereof is limited by the rigidity of the absorbent body. In addition, there is also a concern that: the absorbent body shrinks in the width direction, so that the wearing feeling and the aesthetic appearance are deteriorated, or the absorbent body is kinked or broken to cause the absorption performance to be lowered.

Therefore, conventionally, such measures have been generally adopted: the elastic stretchable member is continuously attached in the width direction, and almost the entire portion overlapping the absorbent body is finely cut, or the elastic stretchable member is not fixed to the outer package at the portion overlapping the absorbent body and is cut at one position in the middle in the width direction, thereby forming a non-stretchable region in which the widthwise contractive force does not act on the absorbent body. As a method for preventing the holes from being formed in the inner sheet layer and the outer sheet layer covering the inside and outside of the elastic stretchable member, there is known a cutting method of: the elastic stretchable member is cut by applying pressure and heat to the cut portion from the inside or the outside thereof in a state where the elastic stretchable member is sandwiched between the inner sheet layer and the outer sheet layer.

On the other hand, in the outer package in the non-stretchable region, the shrinking force of the elastic stretchable member hardly acts, and the shrink wrinkles are hardly formed, and therefore, the light transmittance is excellent as compared with the portion where the shrink wrinkles are formed. Therefore, a display sheet with a design or the like is sandwiched between the exterior body and the interior body at the position (see patent document 1) or between sheets of the exterior body (see patent document 2).

Since the display sheet is visually recognized through the constituent material of the outer package, it is desirable to sandwich the display sheet between the elastic stretchable member and the sheet layer outside the elastic stretchable member of the outer package as described in patent document 2 in order to make the display more clearly visually recognized. In this case, since the display sheet and the elastic stretchable member are adjacent to each other, it is desirable to have a structure in which the elastic stretchable member is not fixed to the display sheet and the sheet layer inside the display sheet, so that the influence of the contractive force of the elastic stretchable member is completely eliminated.

However, in the case of manufacturing, the elastic stretchable member and the display sheet are arranged between the outer sheet layer and the inner sheet layer, and the elastic stretchable member is cut by applying pressure and heat to a region having the display sheet.

That is, to achieve the following: it is desirable that the elastic stretchable member is reliably cut even at a high speed of a production line without the cut portion of the elastic stretchable member adhering to the peripheral member, and that the elastic stretchable member is pressurized through the outer sheet layer or the inner sheet layer by a projection having a temperature lower than the melting point of the elastic stretchable member but sufficiently higher than the melting point of the elastic stretchable member. However, since a nonwoven fabric using a thermoplastic resin having a melting point lower than that of the elastic stretchable member as a raw material is generally used as the outer sheet layer and the inner sheet layer, there is a possibility that a melting mark remains or a hole is opened at a cut portion of the elastic stretchable member due to melting of the outer sheet layer, and the appearance of the display sheet may be deteriorated due to overlapping of the cutting mark with the display sheet. In particular, if the display sheet is a thermoplastic sheet such as a general nonwoven fabric or resin film, there is a fear that: melt to the display sheet and partially cut or open a hole.

Patent document 1: japanese laid-open patent publication No. 2012-100694

Patent document 2: japanese patent laid-open publication No. 2004-254861

Patent document 3: japanese patent application laid-open No. 2010-158590

Disclosure of Invention

Therefore, a main object of the present invention is to suppress deterioration of the appearance of a display sheet due to a cut trace of an elastic stretchable member.

The present invention for solving the above problems is as follows.

< invention described in claim 1 >

A pants-type disposable diaper comprising: a front side outer body constituting a front body part; a rear side outer body constituting a rear body portion; and an inner body including an absorbent body, which is provided at a widthwise central portion from an inner surface of the front outer body to an inner surface of the rear outer body, and in which both side portions of the front outer body and both side portions of the rear outer body are joined together, respectively, thereby forming a waist openingA pair of left and right leg openings, the front side outer covering and the rear side outer covering being separated in a front-rear direction, at least one of the front side outer covering and the rear side outer covering having a non-stretchable region provided at a middle in a width direction and stretchable regions provided at both sides in the width direction of the non-stretchable region in a range in the front-rear direction of the absorbent body, the stretchable regions being regions having an inner sheet layer composed of a nonwoven fabric layer of a thermoplastic resin, an outer sheet layer composed of a nonwoven fabric layer of a thermoplastic resin, and a plurality of elongated elastic stretchable members attached between the inner sheet layer and the outer sheet layer at intervals in the front-rear direction and in an elongated state along the width direction, respectively, the non-stretchable regions having: an inner sheet layer and an outer sheet layer continuous with the telescopic region; and an extra elastic member remaining between the inner sheet layer and the outer sheet layer, the extra elastic member comprising at least one of a cut-off portion which is continuous with the elastic member in the stretchable region and a remaining portion which is not continuous with the elastic members in both the stretchable regions, the extra elastic member having a display sheet which is visually recognizable from outside in the non-stretchable region, the elastic member having a melting point higher than a melting point of the inner sheet layer and a melting point of the outer sheet layer, wherein the display sheet is provided adjacent to an inner side of the outer sheet layer in the non-stretchable region, the extra elastic member is not fixed to an inner side surface and an inner sheet layer of the display sheet, and the display sheet has a thickness of 50 to 200 [ mu ] m and a density of 50kg/m³～400kg/m³Is additionally displayed on the crepe paper.

(Effect)

In the present invention, a crepe paper having a certain thickness and a certain low density is used as a substrate of the display sheet. Such crepe paper is excellent in heat insulation property, unlike ordinary paper, and therefore, when an elastically stretchable member is cut by sandwiching it between the inner sheet layer and the outer sheet layer and heating the pressed portion only from the inner side of the inner sheet layer as described in a manufacturing method described later, the heat is hardly transmitted to the outer sheet layer due to the heat insulation property of the crepe paper, and as a result, in a region having a display sheet in a non-stretchable region, although there is a possibility that a melting mark remains as a cut mark in the inner sheet layer, there is no melting mark in the outer sheet layer, or even if there is a melting mark, the melting does not progress further from the inner sheet layer, that is, there remains an unnoticeable melting mark. Therefore, according to the present invention, deterioration in the appearance of the display sheet due to the cutting trace of the elastic stretchable member can be suppressed.

< invention described in claim 2 >

The pants-type disposable diaper according to claim 1, wherein an outer side surface of the inner sheet layer is welded to an inner side surface of the display sheet.

(Effect)

In the case where the extra elastic stretchable member is not fixed to the inner surface of the display sheet and the inner sheet layer, the inner surface of the display sheet and the outer surface of the inner sheet layer may not be joined together, but in this case, the display sheet may be in a state of being lifted from the inner sheet layer, and there is a concern that the appearance may be affected by the formation of unexpected wrinkles or the like. Therefore, it is desirable to weld the outer surface of the inner sheet layer to the inner surface of the display sheet as described in the present embodiment, and in this case, since the display sheet is crepe paper having fine wrinkles on the surface, there are advantages in that: the melt of the inner sheet layer is well adhered to the display sheet and is more firmly fixed.

< invention described in claim 3 >

The pants-type disposable diaper according to claim 2, wherein the crepe paper has an air permeability of 1cc/cm²·sec～50cc/cm²·sec。

(Effect)

The crepe paper using such air permeability is more preferable. The air permeability is measured according to JIS L1096.

< invention described in claim 4 >

The pants-type disposable diaper according to any one of claims 1 to 3, wherein a release agent is applied to at least an inner surface of the display sheet.

(Effect)

If the release agent is applied to at least the inner surface of the display sheet, when the elastic stretchable member is cut by pressure and heat, the problem that the cut end of the elastic stretchable member adheres to the inner surface of the display sheet and the display sheet shrinks can be suppressed.

< invention described in claim 5 >

A method of manufacturing a pants-type disposable diaper according to claim 1, wherein the outer cover is formed by attaching the display sheet and the elastic stretch member between the inner sheet layer and the outer sheet layer to form a portion to be the stretch region and a portion to be the non-stretch region, and then the elastic stretch member is cut by heating the pressed portion only from the inner side of the inner sheet layer while sandwiching and pressing the pressed portion from the inner side of the inner sheet layer and the outer side of the outer sheet layer at the portion to be the non-stretch region.

(Effect)

If crepe paper having a certain thickness and a certain low density is used as the substrate of the display sheet, and after the display sheet and the elastic expansion member are mounted between the inner sheet layer and the outer sheet layer to form a part which becomes an expansion region and a part which becomes a non-expansion region, when the elastic stretchable member is cut by sandwiching and pressing the inner sheet and the outer sheet from the inside and heating only the pressed portion from the inside of the inner sheet, the heat is hardly transmitted to the outer sheet due to the heat insulation property of the crepe paper, and as a result, in the non-stretch region, the region having the display sheet may have a melt mark remaining on the inner sheet layer as a cut mark, but, there were no melting marks on the outer sheet layer, or even if there were melting marks, the melting did not progress further from the inner sheet layer, i.e. no noticeable melting marks remained. Therefore, according to the present invention, deterioration in the appearance of the display sheet due to the cutting trace of the elastic stretchable member can be suppressed.

< invention described in claim 6 >

The method of manufacturing a pants-type disposable diaper according to claim 5, wherein the heating is performed at a temperature lower than the melting point of the elastic stretch member and higher than the melting point of the inner sheet and the melting point of the outer sheet.

(Effect)

The present invention is suitable for the case of heating at such a temperature.

< invention described in claim 7 >

In the method of manufacturing a pants-type disposable diaper according to

claim

5 or 6, the elastic stretchable member is cut by the heating, and the outer side surface of the inner sheet layer is welded to the inner side surface of the display sheet at the cut position.

(Effect)

By this method, the pants-type disposable diaper according to claim 2 can be manufactured.

< invention described in claim 8 >

The method of manufacturing a pants-type disposable diaper according to claim 7, wherein the air permeability of the display sheet is 1cc/cm²·sec～50cc/cm²·sec。

(Effect)

The same effects as those of the invention described in claim 3 can be achieved.

< invention described in claim 9 >

The method of manufacturing a pants-type disposable diaper according to any one of claims 5 to 8, wherein a release agent is applied to at least an inner surface of the display sheet.

(Effect)

The same effects as those of the invention described in claim 4 can be achieved.

As described above, according to the present invention, there is an advantage that deterioration in the appearance of the display sheet due to the cutting trace of the elastic stretchable member can be suppressed.

Drawings

Fig. 1 is a plan view showing an inner surface of a pants-type disposable diaper in a state where the diaper is unfolded.

Fig. 2 is a plan view showing an outer surface of a pants-type disposable diaper in a state where the diaper is unfolded.

Fig. 3 is a sectional view taken along line 3-3 of fig. 1.

Fig. 4 is a cross-sectional view taken along line 4-4 of fig. 1.

Fig. 5 (a) is a sectional view taken along line 5-5 of fig. 1, and fig. 5 (b) is a sectional view taken along line 6-6 of fig. 1.

Fig. 6 is a perspective view of a pants-type disposable diaper.

Fig. 7 is a sectional view corresponding to a section taken along line 5-5 in fig. 1.

Fig. 8 is a sectional view corresponding to a section taken along line 5-5 in fig. 1.

Fig. 9 is a sectional view corresponding to a section taken along line 5-5 in fig. 1.

Fig. 10 is a sectional view corresponding to a section taken along line 5-5 in fig. 1.

Fig. 11 is a sectional view corresponding to a section taken along line 5-5 in fig. 1.

Fig. 12 is a sectional view corresponding to a section taken along line 5-5 in fig. 1.

Fig. 13 is a perspective view of the cutting device.

Fig. 14 is an enlarged plan view of the display piece portion.

Description of the reference symbols

A1: a non-stretch region; a2: a telescoping region; l: a middle region; LO: a leg opening part; t: a waist region; u: a lower waist portion; w: a waist part; WO: a waist opening; 11: a liquid-impermeable sheet; 12: an exterior body; 12A: a side seal part; 12F: a front side outer package; 12B: a rear-side outer housing; 12H: an inner sheet layer; 12S: an outer sheet layer; 12 i: a gap; 12 r: a waist-side turn-back portion; 14: a hip cover portion; 18: elastic telescopic parts are not needed; 20: an crotch-side fold back portion; 22: melting traces; 25: a display sheet; 30: a topsheet; 40: an intermediate sheet; 50: an absorbent member; 56: an absorbent body; 58: packaging the sheet; 60: a stereoscopic barrier; 62: a blocking sheet; 200: an interior body; 201: an inner and outer fixing portion.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the drawings.

Fig. 1 to 6 show an example 100 of a pants-type disposable diaper. The dotted portion in the cross-sectional view indicates an adhesive as a joining means for joining the respective components located on the front and back sides thereof, and is formed by full-surface coating, linear (ビード) coating, curtain (カーテン) coating, critical portion (サミット) coating or spiral coating, pattern coating (transfer of the hot-melt adhesive by a relief method), or the like of the hot-melt adhesive, or a fixed portion of the elastically stretchable member is formed by applying the adhesive to the outer peripheral surface of the elastically stretchable member instead of or together with the adhesive by a coating gun, a size coating, or the like. Examples of the hot melt adhesive include EVA adhesives, adhesive rubber adhesives (elastic adhesives), olefin adhesives, and polyester polyamide adhesives, and can be used without particular limitation. As a joining means for joining the respective constituent members, a material-based welding means such as heat sealing or ultrasonic sealing may be employed.

The pants-type disposable diaper 100 of the present embodiment includes: a front side exterior body 12F constituting a front body portion F; a rear side outer body 12B constituting a rear body portion B; and an interior body 200 provided inside the

exterior bodies

12F, 12B so as to extend from the front side exterior body 12F to the rear side exterior body 12B through the crotch portion, wherein both side portions of the front side exterior body 12F and both side portions of the rear side exterior body 12B are joined to form side seal portions 12A, whereby openings formed in the front and rear end portions of the

exterior bodies

12F, 12B serve as waist openings WO through which the waist of the wearer passes, and portions surrounded by the lower edges of the

exterior bodies

12F, 12B and the side edges of the interior body 200 on both sides in the width direction of the interior body 200 serve as leg openings LO through which legs pass. The inner body 200 is a portion for absorbing and retaining excrement such as urine, and the outer body 12 is a portion for supporting the inner body 200 against the body of the wearer. In addition, reference numeral Y denotes the entire length of the diaper in the developed state (the longitudinal length from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the rear body B), and reference numeral X denotes the full width of the diaper in the developed state.

The pants-type disposable diaper 100 of the present embodiment has a waist region T having side seals 12A and defining a front-rear direction range (a front-rear direction range from the waist opening WO to the upper ends of the leg openings LO), and an intermediate region L defining a front-rear direction range of the portion forming the leg openings LO (between the front-rear direction region of the front body portion F having the side seals 12A and the front-rear direction region of the rear body portion B having the side seals 12A). The waist region T can be conceptually divided into a "waist portion" W forming an edge portion of the waist opening and a "waist lower portion" U being a portion below the waist portion W. In general, when a boundary where the stretching stress in the width direction changes (for example, the thickness or the elongation of the elastic stretchable member changes) is present in the waist region T, the portion on the side of the waist opening WO closest to the boundary becomes the waist portion W, and when such a boundary is absent, the portion on the side of the waist opening WO closer to the absorbent body 56 or the interior body 200 becomes the waist portion W. The length of these portions in the front-rear direction may be appropriately determined depending on the size of the product, and may be 15 to 40mm in the waist portion W and 65 to 120mm in the lower waist portion U, for example. On the other hand, both side edges of the intermediate region L are gathered in an コ -shape or a curved shape along the circumference of the wearer's leg, which is a portion into which the wearer's leg is inserted. As a result, the pants-type disposable diaper in an unfolded state is formed into a substantially hourglass shape as a whole.

(inner body)

The inner body 200 may have any shape, but is rectangular in the illustrated embodiment. As shown in fig. 3 to 5, the interior body 200 includes: a topsheet 30 on the body side; a liquid-impermeable sheet 11; and an absorbent member 50 interposed between the top sheet 30 and the liquid-impermeable sheet 11, wherein the interior body 200 is a main body portion having an absorbent function. Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent member 50 in order to rapidly move the liquid having permeated the top sheet 30 toward the absorbent member 50, and reference numeral 60 denotes a three-dimensional barrier section 60 standing toward the body side and provided on both sides of the interior body 200 in order to prevent the leakage of excrement to both sides of the interior body 200.

The fixation of the interior body 200 to the

exterior bodies

12F, 12B may be performed by a bonding means by material fusion such as heat sealing or ultrasonic sealing, or a hot-melt adhesive. In the illustrated embodiment, the inner body 200 is fixed to the inner surface of the outer body 12 by a hot-melt adhesive applied to the back surface of the liquid-impermeable sheet 11 and the attachment portion 65 of the steric barrier 60. The inner and outer fixing portions 201 for fixing the interior body 200 and the

exterior bodies

12F and 12B together may be provided over substantially the entire region where the two overlap, and are preferably provided in portions other than both ends in the width direction of the interior body.

(Top sheet)

The top sheet 30 has a liquid-permeable property, and examples thereof include a porous or non-porous nonwoven fabric, a porous plastic sheet, and the like. The kind of the raw material fiber of the nonwoven fabric is not particularly limited. Examples thereof include olefin-based fibers such as polyethylene and polypropylene, synthetic fibers such as polyester and polyamide, regenerated fibers such as rayon and cuprammonium fibers, natural fibers such as cotton, and the like, and mixed fibers and composite fibers using two or more of these fibers. Further, the nonwoven fabric may be produced by any process. Examples of the processing method include a spunlace method, a spunbond method, a hot-rolling method, a melt-blowing method, a needle-punching method, a hot-air method, and a point-bonding method. For example, when flexibility and drapability are desired, the spunbond method and the spunlace method are preferred processing methods, and when bulkiness and flexibility are desired, the hot air method, the spot-bonding method, and the hot-rolling method are preferred processing methods.

The top sheet 30 may be composed of one sheet, or may be composed of a laminate sheet obtained by laminating two or more sheets. Similarly, the top sheet 30 may be formed of one sheet or two or more sheets in the planar direction.

In the case where the steric barrier 60 is provided, it is preferable that both side portions of the top sheet 30 pass through between the liquid impermeable sheet 11 and the steric barrier 60 and go around to the back side of the absorbent member 50, and that both side portions of the top sheet 30 are joined to the liquid impermeable sheet 11 and the steric barrier 60 in order to prevent the penetration of liquid.

For the purpose of preventing positional deviation with respect to the back side member, it is desirable that the top sheet 30 is fixed to the member adjacent to the back side by a bonding means by fusion of materials such as heat sealing and ultrasonic sealing, or a hot melt adhesive. In the illustrated embodiment, the top sheet 30 is fixed to the front surface of the intermediate sheet 40 and the front surface of the portion of the packaging sheet 58 located on the front surface side of the absorber 56 by a hot melt adhesive applied to the back surface thereof.

(intermediate sheet)

In order to rapidly transfer the liquid having passed through the top sheet 30 to the absorbent member, an intermediate sheet (also referred to as "second sheet") 40 having a liquid passing speed higher than that of the top sheet 30 may be provided. The intermediate sheet 40 not only can rapidly move the liquid toward the absorbent body to improve the absorption performance of the absorbent body, but also can prevent the phenomenon of "back flow" of the absorbed liquid from the absorbent body, and can keep the top sheet 30 in a dry state. The intermediate sheet 40 may also be omitted.

The intermediate sheet 40 may be made of the same material as the top sheet 30, or may be a spun lace nonwoven fabric, a spunbond nonwoven fabric, an SMS nonwoven fabric, a pulp nonwoven fabric, a mixed sheet of pulp and rayon, a point-bond nonwoven fabric, or a crepe paper. In particular, the air-through nonwoven fabric is preferably bulky. In the air-through nonwoven fabric, a composite fiber having a core-sheath structure is preferably used, and in this case, the resin used for the core may be polypropylene (PP), but Polyester (PET) having high rigidity is preferred. The weight per unit area is preferably 20 to 80g/m²More preferably 25 to 60g/m². The thickness of the raw material fiber of the nonwoven fabric is preferably 2.2 to 10 dtex. In order to make the nonwoven fabric bulky, it is preferable to use a bias fiber, a hollow fiber, or a bias and hollow fiber having no core at the center as a mixed fiber of all or a part of the raw material fibers.

The intermediate sheet 40 in the illustrated embodiment is shorter than the width of the absorber 56 and disposed at the center, and may be provided over the entire width. The longitudinal length of the intermediate sheet 40 may be the same as the length of the absorbent body 56, or may be within a short length range centered on the liquid-receiving region.

For the purpose of preventing positional deviation with respect to the back side member, etc., it is desirable that the intermediate sheet 40 is fixed to the member adjacent on the back side by a bonding means by material fusion such as heat sealing or ultrasonic sealing, or a hot melt adhesive. In the illustrated embodiment, the intermediate sheet 40 is fixed to the front surface of the portion of the packaging sheet 58 located on the front surface side of the absorber 56 by a hot melt adhesive applied to the back surface thereof.

(liquid-impermeable sheet)

The material of the liquid-impermeable sheet 11 is not particularly limited, and examples thereof include a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric in which a plastic film is provided on the surface of a nonwoven fabric, and a laminate sheet in which a nonwoven fabric and the like are laminated and bonded to a plastic film. The liquid-impermeable sheet 11 is preferably made of a material having liquid impermeability and moisture permeability, which is preferably used from the viewpoint of preventing stuffiness. As a plastic film having moisture permeability, a microporous plastic film obtained by mixing an inorganic filler with an olefin resin such as polyethylene or polypropylene, molding the mixture into a sheet, and then stretching the sheet in one or two axial directions is widely used. In addition, as the liquid-impermeable sheet 11, a sheet having liquid-impermeability without using a plastic film can be used, and such a sheet can be made liquid-impermeable by the following method: a non-woven fabric using micro fine denier fiber is used; a leak-proof reinforcing treatment for reducing the voids of the fibers by applying heat or pressure; coating high water absorption resin or hydrophobic resin or water repellent.

The liquid-impermeable sheet 11 may be formed to have a width that is accommodated on the back side of the absorbent member 50 as shown in the figure, and may extend to both sides of the absorbent member 50 and to both side portions of the surface of the absorbent member 50 on the top sheet 30 side in order to improve leakage prevention. The width of the extending portion is preferably about 5 to 20mm on the left and right sides.

Further, a excretion indicator whose color changes by the absorption of a liquid component may be provided on the inner side of the liquid-impermeable sheet 11, particularly on the surface closer to the absorbent body 56.

(stereoscopic barrier part)

The steric barrier 60 is a belt-like member extending in the entire front-rear direction along both side portions of the interior body 200, and is designed to block excrement moving in the lateral direction on the top sheet 30 to prevent side leakage. The steric hindrance portion 60 of the present embodiment is provided so as to rise from the side portion of the interior body 200, the base side portion of the steric hindrance portion 60 rises obliquely toward the widthwise central side, and the distal side portion of the steric hindrance portion 60 with respect to the intermediate portion thereof rises obliquely toward the widthwise outer side.

More specifically, the steric barrier 60 is configured as follows: the band-shaped barrier sheet 62 having a length equal to the length of the interior body 200 in the front-rear direction is folded back in the width direction and folded into two, and a plurality of the barrier elastic expansion members 63 are fixed between the folded-back portion and the sheet adjacent thereto at intervals in the width direction with the elongated barrier elastic expansion members 63 being elongated in the length direction. A base end portion of the steric hindrance section 60 on the side opposite to the tip end portion (an end portion on the side opposite to the portion where the sheet folding is performed in the width direction) is a mounting portion 65 fixed on the back surface of the side edge portion of the interior body 200, and a portion other than the mounting portion 65 is a protruding portion 66 (a portion on the folded portion side) protruding from the mounting portion 65. The projecting portion 66 is constituted by a root side portion toward the center side in the width direction and a tip side portion turned back from the tip of the root side portion toward the outer side in the width direction. This form is a face contact type steric barrier, and a line contact type steric barrier (not shown) that is not folded outward in the width direction may be employed. The projecting portions 66 have front and rear end portions serving as front and rear fixing portions 67 fixed to the side surface of the top sheet 30 in a collapsed state, and have a front and rear intermediate portion serving as a free portion 68 that is not fixed therebetween, and the stopper elastic stretchable member 63 extending in the front and rear direction is fixed to the free portion 68 in an extended state.

At the free portion 68 of the steric barrier 60, at least one of a hot melt adhesive by various coating methods and a fixing means by material fusion such as heat sealing or ultrasonic sealing may be used for bonding the inner layer and the outer layer of the barrier sheet 62 or fixing the barrier elastic stretchable member 63 sandwiched therebetween. Since the flexibility is impaired if the entire surfaces of the inner and outer layers of the barrier sheet 62 are bonded, it is preferable that the barrier elastic members 63 are not bonded or weakly bonded except for the bonded portion. In the illustrated embodiment, the structure is as follows: by applying a hot-melt adhesive only to the outer peripheral surface of the barrier elastic stretchable member 63 by an application means such as a coating gun or a glue nozzle and sandwiching the same between the inner layer and the outer layer of the barrier sheet 62, the elongated elastic stretchable member is fixed to the inner layer and the outer layer of the barrier sheet 62 and the inner layer and the outer layer of the barrier sheet 62 by the hot-melt adhesive only applied to the outer peripheral surface of the barrier elastic stretchable member 63.

In addition, for the fixation of the waterproof film 64 and the barrier sheet 62 incorporated in the steric barrier 60 or the fixation of the front-rear fixing portion 67 to the side surface of the interior body 200, at least one of a hot-melt adhesive by various coating methods and a means based on material fusion such as heat sealing or ultrasonic sealing may be used. In the illustrated embodiment, the waterproof film 64 is fixed by slit coating using a hot-melt adhesive. In addition, although a hot-melt adhesive and a material fusion method are used in combination for fixing the front and rear fixing portions 67 in the illustrated embodiment, these fixing portions may be performed by only one of the methods.

As the barrier sheet 62, a structure in which a soft nonwoven fabric excellent in uniformity and hiding property, such as a spunbond nonwoven fabric (SS, SSs, etc.), an SMS nonwoven fabric (SMS, SSMMS, etc.), and a meltblown nonwoven fabric, is subjected to water repellent treatment with silicon or the like as necessary can be suitably used, and the weight per unit area of the fiber is preferably about 10 to 30g/m². As the elongated elastic members 63, rubber threads or the like can be used. When the spandex rubber wire is used, the thickness is preferably 470 to 1240dtex, and more preferably 620 to 940 dtex. The elongation at fixation is preferably 150 to 350%, more preferably 200 to 300%. In addition, the term "elongation" means to make naturalLength is 100%. As shown in the drawing, the waterproof film 64 may be interposed between the barrier sheets folded into two.

The number of the elongated elastic members 63 provided in the free portion of the steric barrier 60 is preferably 2 to 6, and more preferably 3 to 5. The arrangement interval 60d is preferably 3 to 10 mm. With such a configuration, the skin can be easily brought into surface contact within the range where the elongated elastic members 63 are disposed. The elongated elastic members 63 may be disposed not only on the distal end side but also on the proximal end side.

The fixing objects of the mounting portions 65 of the steric barrier 60 may be appropriate components of the top sheet 30, the liquid-impermeable sheet 11, the absorbent member 50, and the like in the interior body 200.

In the steric hindrance section 60 configured as described above, the contraction force of the elongated elastic stretchable member 63 acts so that both ends in the front-rear direction approach each other, but both ends in the front-rear direction of the protruding portion 66 are fixed so as not to rise, whereas both ends form an unfixed free portion therebetween, so that only the free portion rises so as to abut on the body side as shown in fig. 3. In particular, when the attachment portion 65 is positioned on the back side of the interior body 200, the steric barrier 60 rises so as to open outward in the width direction at the crotch portion and the vicinity thereof, and therefore the steric barrier 60 is in surface contact with the leg periphery, and the fit is improved.

The size of the steric barrier 60 may be determined as appropriate, but in the case of an infant diaper, for example, as shown in fig. 3, the standing height (the width-directional length of the protruding portion 66 in the developed state) W6 of the steric barrier 60 is preferably 15 to 60mm, and particularly preferably 20 to 40 mm. The separation distance W3 between the innermost fold lines in the state where the steric barrier 60 is folded flat parallel to the front surface of the top sheet 30 is preferably 60 to 190mm, and particularly preferably 70 to 140 mm.

Further, unlike the illustrated embodiment, two (two) stereoscopic barrier portions may be provided on each of the right and left sides of the inner package 200.

(absorbing Member)

The absorbent member 50 has: an absorber 56; and a wrapping sheet 58 covering the entire absorbent body 56. The wrapping sheet 58 may be omitted.

(absorber)

The absorbent body 56 may be formed of an aggregate of fibers. As the fiber aggregate, in addition to an aggregate obtained by stacking short fibers such as cotton pulp or synthetic fibers, a filament (filament) aggregate obtained by opening a tow (fiber bundle) of synthetic fibers such as cellulose acetate, if necessary, can be used. The weight per unit area of the fibers may be, for example, about 100 to 300g/m in the case of stacking cotton pulp or short fibers²In the case of the filament aggregate, the amount of the filament aggregate may be, for example, about 30 to 120g/m². The fineness of the synthetic fiber is, for example, 1 to 16dtex, preferably 1 to 10dtex, and more preferably 1 to 5 dtex. In the case of the filament assembly, the filaments may be uncrimped fibers, but crimped fibers are preferable. The crimp of the crimped fibers may be, for example, 5 to 75 crimps per inch, preferably 10 to 50 crimps, and more preferably about 15 to 50 crimps. In addition, crimped fibers that are uniformly crimped are often used. The superabsorbent polymer particles are preferably dispersed and held in the absorbent body 56.

The absorbent body 56 may have a rectangular shape, but as shown in fig. 1 and 2, it is preferable that the absorbent body 56 itself and the steric hindrance portion 60 have an hourglass shape having a front end portion, a rear end portion, and a constricted portion which is located between the front end portion and the rear end portion and has a width smaller than the width of the front end portion and the rear end portion, because the fit around the leg portions is improved.

The size of the absorbent body 56 may be appropriately determined as long as it extends over the front, rear, left, and right sides of the urination opening position, but preferably extends in the front-rear direction and the width direction to the peripheral edge portion of the interior body or the vicinity thereof. Reference numeral 56X denotes the width of the absorber 56.

(super absorbent Polymer particles)

The super absorbent polymer particles may be contained in a part or all of the absorbent body 56. The super absorbent polymer particles include "powder" in addition to "particles". As the super absorbent polymer particles 54, particles used in such disposable diapers can be used as they are, and for example, particles having a ratio of particles remaining on the screen of 30% by weight or less in the screening (shaking for 5 minutes) using a standard screen of 500 μm (JIS Z8801-1: 2006) and particles having a ratio of particles remaining on the screen of 60% by weight or more in the screening (shaking for 5 minutes) using a standard screen of 180 μm (JIS Z8801-1: 2006) are desirable.

The material of the super absorbent polymer particles is not particularly limited, but a material having a water absorption capacity of 40g/g or more is preferable. Examples of the super absorbent polymer particles include high absorbent polymer particles such as starch-based, cellulose-based, and synthetic polymer-based, and high absorbent polymer particles such as starch-acrylic acid (salt) -grafted polymer, saponified product of starch-acrylonitrile copolymer, crosslinked sodium carboxymethylcellulose, and acrylic acid (salt) -based polymer can be used. The shape of the super absorbent polymer particles is preferably a powder shape which is generally used, but other shapes may be used.

The superabsorbent polymer particles preferably have a water absorption rate of 70 seconds or less, particularly 40 seconds or less. If the water absorption rate is too slow, so-called back flow in which the liquid supplied into the absorbent body 56 returns to the outside of the absorbent body 56 tends to occur.

The weight per unit area of the super absorbent polymer particles can be appropriately determined according to the absorption amount required for the use of the absorbent body 56. Therefore, it cannot be said that the concentration of the water is 50 to 350g/m². If the weight per unit area of the polymer is less than 50g/m²It is difficult to ensure the absorption amount. If the weight per unit area of the polymer exceeds 350g/m²The effect is saturated.

The distribution density or the distribution amount of the super absorbent polymer particles can be adjusted in the planar direction of the absorbent body 56, if necessary. For example, the amount of liquid spread at the excretion portion may be made larger than the amount of liquid spread at other portions. In the case of considering the difference between men and women, the distribution density (amount) can be increased in the front side in the case of men, and the distribution density (amount) can be increased in the central portion in the case of women. Further, a portion where no polymer is present may be provided locally (for example, in a dot shape) in the planar direction of the absorbent body 56.

(packaging sheet)

When the packaging sheet 58 is used, a tissue paper (tissue paper), particularly crepe paper, nonwoven fabric, composite laminated (ポリラミ) nonwoven fabric, a sheet with small holes, or the like can be used as a material thereof. However, a sheet in which superabsorbent polymer particles do not come out is desired. When a nonwoven fabric is used instead of the crepe paper, a hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly preferable, and polypropylene, a polyethylene/polypropylene composite material, or the like can be used as the material. The weight per unit area is desirably 5 to 40g/m²Particularly preferably 10 to 30g/m²。

The packaging method of the packaging sheet 58 may be appropriately determined, but from the viewpoints of ease of production, prevention of leakage of superabsorbent polymer particles from the front and rear edges, and the like, the following method is preferred: the packaging sheet 58 is wound in a tubular shape so as to surround the front and back surfaces and both side surfaces of the absorbent body 56, and the front and back edge portions thereof are exposed from the front and back of the absorbent body 56, and the overlapped portion of the wound and overlapped portion and the front and back exposed portion are joined by joining means such as a hot melt adhesive or material welding.

(outer body)

The

outer bodies

12F and 12B are composed of a front side outer body 12F which is a part constituting the front body portion F and a rear side outer body 12B which is a part constituting the rear body portion B, and the front side outer body 12F and the rear side outer body 12B are separated and discontinuous in the front-rear direction on the crotch side. The separation distance 12d may be about 150 to 250 mm. The crotch cover sheet 12M made of nonwoven fabric or the like is desirably bonded so as to cover a part (for example, the entire part in the front-rear direction extending over the part exposed between the front outer cover 12F and the rear outer cover 12B but not extending to the front-rear end of the inner cover 200 and not reaching the both side edges of the inner cover 200 in the width direction) or the entire part of the exposed portion of the back surface of the inner cover 200 at the separated portion, but may be omitted.

The

outer cases

12F and 12B have a waist portion corresponding to the waist region T and extending in the front-rear direction. In this embodiment, the front side outer package 12F does not have a portion corresponding to the middle region L, but the rear side outer package 12B has a hip cover portion 14 extending from the waist region T toward the middle region L. Although not shown, a groin cover portion extending from the waist region T toward the middle region L may be provided on the front side outer cover 12F, a groin cover portion may be provided but no hip cover portion may be provided, or a portion corresponding to the middle region L may not be provided on both the front side outer cover 12F and the rear side outer cover 12B. In the illustrated embodiment, the lower edge of the hip cover portion 14 is formed linearly in the width direction in the same manner as the lower edge of the front side outer package 12F, but may be curved so as to approach the waist opening side as it goes to the outside in the width direction.

As shown in fig. 3 to 5, the

outer cases

12F and 12B are formed by joining the outer sheet layer 12S and the inner sheet layer 12H by joining means such as hot melt adhesive or fusion bonding. The sheet forming the outer sheet layer 12S and the sheet forming the inner sheet layer 12H may be a single sheet in common as shown in fig. 9 and 10, in addition to being separate sheets as shown in fig. 5, 7, 8, 11 and 12. In other words, in the latter case, the inner sheet layer 12H and the outer sheet layer 12S are formed by the inner portion and the outer portion of one sheet folded back at the crotch-side edge portion, respectively. In the former system, since the number of sheet folding steps is small, there is an advantage that the sheet is less likely to be displaced when the inner sheet layer 12H and the outer sheet layer 12S are bonded, and in the latter system, there is an advantage that the number of sheet materials is small.

If the end portions of the sheets forming the outer sheet layer 12S and the inner sheet layer 12H or the front and rear ends of the interior body 200 are exposed at the waist opening WO as shown in fig. 10, there is a concern that: the corners of the sheet come into contact with the skin to deteriorate the skin touch feeling, or an elastic member for the waist portion W or a hot-melt adhesive for fixing the elastic member, which will be described later, is exposed. Therefore, as in the embodiment shown in fig. 5, 7 to 9, and 11, it is preferable that the sheet forming the outer sheet layer 12S is wound around the edge portion on the waist side of the sheet forming the inner sheet layer 12H, and then folded back inward to form a waist-side folded-back portion, and the waist-side folded-back portion 12r is extended to the end portion on the waist side of the interior body 200. As shown in fig. 12, both the sheet forming the outer sheet layer 12S and the sheet forming the inner sheet layer 12H may be folded back inward at the waist-side edge portion, and the folded-back portion 12r may be extended to the waist-side end portion of the interior body 200.

The sheet used for the outer sheet layer 12S and the inner sheet layer 12H is not particularly limited as long as it is a nonwoven fabric of a thermoplastic resin, and examples thereof include olefin-based fibers such as polyethylene and polypropylene, synthetic fibers such as polyester and polyamide, and mixed fibers and composite fibers using two or more of these. Further, the nonwoven fabric may be produced by any process. Examples of the processing method include a spunlace method, a spunbond method, a hot-rolling method, a melt-blowing method, a needle-punching method, a hot-air method, and a point-bonding method. When a nonwoven fabric is used, the weight per unit area is preferably about 10 to 30g/m²。

The total weight per unit area of the

outer cases

12F and 12B is preferably about 20 to 60g/m²。

In the

outer bodies

12F and 12B, elongated elastic members 15 to 19 such as rubber threads are provided between the outer sheet layer 12S and the inner sheet layer 12H at a predetermined elongation rate in order to improve the fit to the waist of the wearer. The elongated elastic members 15 to 19 may be made of synthetic rubber or natural rubber. The

outer sheets

12F and 12B are bonded to each other or the elongated elastic members 15 to 19 are fixed to each other by hot melt adhesives applied by various coating methods or by material fusion such as heat sealing or ultrasonic sealing. Since flexibility is impaired when the entire surfaces of the

outer cases

12F and 12B are firmly fixed, it is preferable that the parts other than the bonded parts of the elongated elastic members 15 to 19 are not bonded or weakly bonded. In the illustrated embodiment, the structure is as follows: the elongated elastic stretchable members 15 to 19 are fixed to the two

sheet layers

12S and 12H and the two

sheet layers

12S and 12H by applying a hot-melt adhesive only to the outer peripheral surfaces of the elongated elastic stretchable members 15 to 19 by an application means such as a coating gun or a glue nozzle and sandwiching the two

sheet layers

12S and 12H.

More specifically, the waist elastic members 17 are fixed to the outer sheet 12S and the inner sheet 12H at the waist portion W of the

outer bodies

12F and 12B so as to be continuous over the entire width direction, with a gap therebetween in the vertical direction, and are extended in the width direction at a predetermined extension rate. Further, 1 or more of the waist elastic expansion members 17 disposed in the region adjacent to the waist lower portion U may overlap the inner body 200, or may be disposed on both sides in the width direction thereof excluding the center in the width direction overlapping the inner body 200. The waist elastic members 17 are preferably fixed to about 3 to 22 members having a thickness of 155 to 1880dtex (in the case of synthetic rubber, a cross-sectional area of 0.05 to 1.5mm, in the case of natural rubber), and a thickness of about 470 to 1240dtex at intervals of 4 to 12mm, with an elongation of 150 to 400%, particularly preferably about 220 to 320%²Particularly preferably about 0.1 to 1.0mm²) The rubber thread of (1). The waist portion elastic members 17 do not need to be all the same in thickness and elongation, and for example, the thickness and elongation of the elastic members may be different between the upper portion and the lower portion of the waist portion W.

A plurality of waist lower portion elastic

stretchable members

15, 19 made of an elongated elastic stretchable member are fixed between the outer sheet 12S and the inner sheet 12H in the waist lower portion U of the

outer cases

12F, 12B at intervals in the vertical direction and are stretched in the width direction at a predetermined elongation.

The

elastic members

15, 19 for the waist lower portion are preferably arranged at intervals of 1 to 15mm, more preferably 3 to 8mm, and have respective elongations of 200 to 350%, more preferably 200 to 350%It is preferably about 240 to 300%, and about 5 to 30 of them are fixed to have a thickness of 155 to 1880dtex, and particularly preferably about 470 to 1240dtex (in the case of synthetic rubber, the cross-sectional area is 0.05 to 1.5mm in the case of natural rubber)²Particularly preferably about 0.1 to 1.0mm²) The rubber thread of (1).

Further, between the outer sheet 12S and the inner sheet 12H in the hip cover portion 14 of the rear outer package 12B, a plurality of cover portion elastic stretchable members 16 each made of an elongated elastic stretchable member are fixed in a state of being stretched in the width direction at a predetermined elongation rate while being spaced apart in the vertical direction.

The cover elastic members 16 are preferably fixed to about 2 to 10 pieces of material having a thickness of 155 to 1880dtex (in the case of synthetic rubber, a cross-sectional area of 0.05 to 1.5mm in the case of natural rubber), and more preferably, about 470 to 1240dtex, at intervals of 5 to 40mm, even more preferably, at intervals of 5 to 20mm, and at an elongation of 150 to 300%, even more preferably, 180 to 260%²Particularly preferably about 0.1 to 1.0mm²) The rubber thread of (1).

When the groin cover portion is provided on the front side outer package 12F, the cover portion elastic/stretchable member may be provided in the same manner.

In the case where the elastically

stretchable members

15, 16, 19 are provided in the range in the front-rear direction including the absorbent body 56 as in the below-waist portion U or the hip cover portion 14 of the illustrated embodiment, in order to prevent contraction of the absorbent body 56 in the width direction over a part or the entire range thereof, the widthwise middle portion (preferably including the entire inner and outer fixing portions 201) including a part or the entire portion overlapping the absorbent body 56 in the width direction is set as the non-stretchable region a1, and the widthwise both sides thereof are set as the stretchable region a2 over the entire range in the width direction.

(display sheet)

In the non-stretchable region a1 of at least one of the front side outer package 12F and the rear side outer package 12B, a display sheet 25 is interposed adjacent to the inside of the outer sheet layer 12S, the display sheet 25 has a display such as a cartoon, and the display of the display sheet 25 is visible through the outer sheet layer 12S.

Characterized in that the base material of the display sheet 25 has a thickness of 50 to 200 μm and a density of 50 to 400kg/m³The crepe paper of (1). The thickness of the crepe paper is preferably 100 to 150 μm, and the density is preferably 100 to 200kg/m³. The crepe paper with the thickness and the density can pass through the crepe paper with the weight per unit area of 10g/m²The above was manufactured with a crepe ratio of about 10%, and the density was calculated from the weight per unit area and the thickness, and the crepe ratio was calculated from ((circumferential speed of yankee dryer) - (circumferential speed of take-up reel))/(circumferential speed of yankee dryer) × 100 (%).

The display to be added to the display sheet 25 is not particularly limited, and a design (including a figure of a painting or a single-dot pattern), a function display such as a use method, a use aid, a size, or a logo display such as a manufacturer, a product name, or a feature function may be added by printing or the like.

Further, in order to completely eliminate the influence of the contraction force of the extra elastic stretching members 18 on the display sheet 25, the extra elastic stretching members 18 are not fixed to the inner surface of the display sheet 25 and the outer surface of the inner sheet layer 12H. The inner surface of the display sheet 25, the extra elastic members 18, and the outer surface of the inner sheet layer 12H may not be fixed to each other. That is, the outer surface of the display sheet 25 or the inner surface of the inner sheet layer 12H may be fixed to the facing surface by fixing means such as hot melt adhesive, but the extra elastic stretchable member 18 is not fixed to the inner surface of the display sheet 25 or the outer surface of the inner sheet layer 12H by fixing means such as hot melt adhesive. Thereby, the extra elastic stretchable member 18 is contracted alone, and the display sheet 25 is not contracted. Such a structure can be formed by: in the production, the elastic

stretchable members

15, 16, and 19 are not fixed to the inner surface of the display sheet 25 and the outer surface of the inner sheet layer 12H by not applying a hot melt adhesive or the like to the portions located in the non-stretchable region a 1.

However, in this case, since a continuous gap is formed on the back side of the display sheet 25, the display sheet 25 entirely floats from the inner sheet layer 12H, and there is a concern that the appearance is impaired, such as the formation of unexpected wrinklesThere is a fear. Therefore, it is also preferable that the extra elastic members 18 are not fixed to the inner surface of the display sheet 25 and the outer surface of the inner sheet layer 12H, and the inner surface of the display sheet 25 and the outer surface of the inner sheet layer 12H are directly joined together. The means for joining the inner sheet layer 12H to the display sheet 25 is not particularly limited, but if the inner sheet layer 12H is welded (particularly, welded by heating when the elastic stretchable and

contractible members

15, 16, 19 are cut, which will be described later), the display sheet 25 is crepe paper having fine wrinkles on the surface, and therefore, the melt of the inner sheet layer 12H is favorably joined to the display sheet 25 and more firmly fixed, which is preferable. In addition, when the fusion of the inner sheet layer 12H is used, if the crepe paper used for the display sheet 25 has an air permeability of 1 to 50cc/cm²Sec, especially 2 to 25cc/cm²Sec is preferable because the adhesion of the melt of the inner sheet layer 12H to the display sheet 25 is particularly good.

(cutting of elastic expansion member)

The stretch region a2 and the non-stretch region a1 may be formed by: elastic stretchable members 15 to 17, 19 are supplied between an inner sheet layer and an outer sheet layer 12S having a display sheet 25 fixed to the inner surface thereof by a hot melt adhesive or the like, the elastic

stretchable members

15, 16, 19 are fixed by the hot melt adhesive only in a portion located in a stretchable region a2, and then the elastic

stretchable members

15, 16, 19 are cut by applying pressure and heat to a middle portion in the width direction in a region having the display sheet 25, or almost the entire elastic

stretchable members

15, 16, 19 are finely cut by applying pressure and heat, whereby stretchability remains in a stretchable region a2 and stretchability is eliminated in a non-stretchable region a 1.

Fig. 13 (a) shows a case where the elastic

stretchable members

15, 16, 19 are cut at one middle portion in the width direction, the seal roller 70 is provided with a pressing portion 71 on the outer peripheral surface, the pressing portion 71 has a cutting convex portion 72 at one middle portion in the circumferential direction, the cutting convex portion 72 is heated to a desired temperature, a cutting object obtained by attaching the display sheet 25 and the elastic stretchable members 15 to 17, 19 between the inner sheet layer 12H and the outer sheet layer 12S is sandwiched by the seal roller 70 and a supporting roller 80 having a smooth surface disposed to face the seal roller 70, and the elastic

stretchable members

15, 16, 19 are pressed and heated only at the portion sandwiched between the cutting convex portion 72 and the outer peripheral surface of the supporting roller 80 to be cut. In the product subjected to such processing, as shown in fig. 14 (a) and (b), only the remaining portions after cutting continuous with the

elastic stretch members

15, 16, and 19 in the stretch region a2 remain as extra elastic stretch members 18 between the outer sheet layer 12S and the inner sheet layer 12H.

Fig. 13 (b) shows a case where almost the entire elastic

stretchable members

15, 16, 19 are finely cut, the seal roller 70 is provided with a pressing portion 71 on the outer peripheral surface, the pressing portion 71 has a plurality of cutting convex portions 73, the cutting convex portions 73 are heated to a desired temperature, a cutting object obtained by attaching the display sheet 25 and the elastic stretchable members 15 to 17, 19 between the inner sheet layer 12H and the outer sheet layer 12S is sandwiched by the seal roller 70 and a supporting roller 80 having a smooth surface arranged to face the seal roller 70, and the elastic

stretchable members

15, 16, 19 are cut only at a portion sandwiched between the cutting convex portions 73 and the outer peripheral surface of the supporting roller 80 by pressing and heating. In the product subjected to such processing, as shown in fig. 14 (c), between the outer sheet layer 12S and the inner sheet layer 12H, the remaining portion after cutting continuous with the elastic

stretchable members

15, 16, 19 in the stretchable region a2 and the cut portion of the elastic stretchable member discontinuous with the elastic

stretchable members

15, 16, 19 in the two stretchable regions a2 remain as the extra elastic stretchable member 18.

According to these methods, the elastically

stretchable members

15, 16, and 19 are cut by heating only the pressing portion for cutting from the inside of the inner sheet layer 12H, and the display sheet 25 having a certain thickness and a density as low as a certain degree as described above, which is a base material, functions as a non-melting heat insulator, and heat is hardly transmitted to the outer sheet layer 12S, so that, in the non-stretchable region a1 in the region having the display sheet 25, there is a possibility that the melting trace 22 remains as a cut trace in the inner sheet layer 12H as shown in fig. 14, but there is no melting trace 22 in the outer sheet layer 12S, or even if there is a melting trace, melting does not progress further from the inner sheet layer 12H, that is, there remains an insignificant melting trace 22. Therefore, deterioration of the appearance of the display sheet 25 due to the cut marks of the elastic

stretchable members

15, 16, 19 can be suppressed.

Further, as shown in fig. 14 (a) and (b), if the cutting of the elastically

stretchable members

15, 16, 19 is performed only at one position in the width direction of the non-stretchable region a1, even if a cut mark such as a melt mark or a compression mark remains in the outer sheet layer 12S, the area thereof is small, and there is an advantage that the following is unlikely to occur: the display of the display sheet 25 is difficult to see due to the overlapping of the cutting traces. In particular, as shown in fig. 14 (b), if the cutting of the elastic

stretchable members

15, 16, 19 for forming the non-stretchable region a1 is performed at a position other than the center in the width direction of the non-stretchable region a1, the position of the cutting trace is not at the center, and the display of the display sheet 25 is not easily obstructed, which is preferable. The cutting pattern may be formed in an appropriate shape such as an く shape or a zigzag shape, in addition to a linear shape as shown in the drawing.

The heating temperature for cutting the elastically

stretchable members

15, 16, 19 (temperature for cutting the convex portions) may be appropriately determined as long as the elastically

stretchable members

15, 16, 19 can be reliably cut, but in order to realize the following: even when the production line is at a high speed, the elastic

stretchable members

15, 16, 19 can be reliably cut and the cut portions of the elastic

stretchable members

15, 16, 19 are not attached to the surrounding members, and are preferably at a temperature lower than the melting point of the elastic

stretchable members

15, 16, 19 but sufficiently high. When the elastic

stretchable members

15, 16, 19 are cut at such a high temperature, if the melting point of the outer sheet layer 12S and the inner sheet layer 12H is lower than the cutting temperature, the melting mark 22 may remain or a hole may be formed in the inner sheet layer 12H at the cut portion of the elastic

stretchable members

15, 16, 19, but the influence on the outer sheet layer 12S is reduced due to the heat insulation effect of the display sheet 25. Generally, the melting point of the nonwoven fabric used for the outer sheet layer 12S and the inner sheet layer 12H is about 160 to 175 ℃, the melting point of the

elastic members

15, 16, 19 is about 200 to 230 ℃, and the heating temperature may be set to 180 to 200 ℃.

When the inner sheet layer 12H is melted by heating at the time of cutting the elastic

stretchable members

15, 16, 19, the display sheet 25 can be joined to the inner sheet layer 12H by fusion welding as described above.

On the other hand, since there is a concern that: since the cut end portions of the elastic

stretchable members

15, 16, 19 adhere to the inner surface of the display sheet 25 by pressure and heat at the time of cutting the elastic

stretchable members

15, 16, 19 and cause contraction of the display sheet 25, it is preferable to coat a release agent in advance on at least the inner surface of the display sheet 25. The release agent may be a silicon-based, fluorine-based, long-chain aliphatic, or the like, and may be used without particular limitation.

(crotch side folding back part)

Preferably, as in the manner shown in fig. 7 and 8, the front-side outer housing 12F and the rear-side outer housing 12B are fixed in the following manner: the sheet forming the outer sheet layer 12S is folded back inside the inner sheet layer 12H at the crotch-side end to form the crotch-side folded portion 20, and the crotch-side folded portion 20 is not opened. Thus, the gap 12i between the display sheet 25 and the inner sheet layer 12H in the front outer body 12F and the rear outer body 12B is closed by the sheet at the crotch-side end, and therefore the gap 12i is reliably prevented from opening to the crotch side. As a result, the following is also reliably prevented: since the gap 12i between the display sheet 25 and the inner sheet 12H is open at the crotch side, the appearance is deteriorated, the inner sheet 12H and the outer sheet 12S of the

outer cases

12F and 12B are peeled off, and the extra elastic stretch member 18 cut to eliminate the stretchability is exposed from the opening or falls out of the opening. In addition, if the crotch-side folded portion 20 is formed by folding back the outer sheet layer 12S inside the inner sheet layer 12H as in this manner, the folded portion of the outer sheet layer 12S is not exposed on the outer surface of the diaper, and therefore deterioration in the appearance due to folding back can be prevented, and conversely, a configuration such as that shown in fig. 11 may be adopted: the sheet forming the inner sheet layer 12H is folded back to the outside of the outer sheet layer 12S at the crotch-side end portion.

The fixing structure of the crotch-side folded back portion 20 is not particularly limited, and the crotch-side folded back portion 20 may be fixed by fixing at the inner and outer fixing portions 201, or may be fixed by fixing of other members, or the crotch-side folded back portion 20 may be fixed to the opposite surface via a hot-melt adhesive as shown in fig. 7. As in the sealed portion denoted by reference numeral 21 in fig. 8, the crotch-side folded-back portion 20 may be sealed together with the folded-back main body portion by material fusion means such as heat sealing or ultrasonic sealing.

When the outer sheet layer 12S and the inner sheet layer 12H of the front side outer package 12F and the rear side outer package 12B are formed by a common single sheet, they may be formed in such a manner as shown in fig. 9 and 10: the inner sheet layer 12H and the outer sheet layer 12S of the front outer cover 12F and the rear outer cover 12B are formed by the inner portion and the outer portion of one sheet folded back at the crotch edge. In this embodiment, the gap 12i between the display sheet 25 and the inner sheet layer 12H in the front outer cover 12F and the rear outer cover 12B is also closed by the sheet material at the crotch-side end portion, and therefore the gap 12i is also reliably prevented from opening to the crotch side.

Further, as in the embodiment shown in fig. 12, the following embodiment may be adopted: both the sheet forming the inner sheet layer 12H of the front outer cover 12F and the rear outer cover 12B and the sheet forming the outer sheet layer 12S are folded back outward (or inward) at the crotch-side end to form the crotch-side folded portion 20. In this manner, the gap 12i between the display sheet 25 and the inner sheet layer 12H in the front outer cover 12F and the rear outer cover 12B is closed by the sheet material at the crotch-side end portion, and therefore the gap 12i is reliably prevented from opening to the crotch side.

As can be seen from the various aspects described above, the folding length of the crotch-side folded portion 20 can be appropriately determined, and may be set to be about the same as the length in the front-rear direction of the exterior body having the folded portion 20 as shown in fig. 9 and 10, in addition to the short portion of about 5 to 30 mm.

As described above, if the gap 12i between the display sheet 25 and the inner sheet layer 12H is difficult to open at the crotch side, the display sheet 25 can be extended to the crotch-side end portions of the front outer cover 12F and the rear outer cover 12B, and a large display area can be secured. Therefore, the separation distance 25e between the crotch-side edge of the display sheet 25 and the crotch-side edges of the front outer cover 12F and the rear outer cover 12B having the display sheet 25 can be set to about 5 to 30 mm.

As shown in fig. 14 (a) and (b), when the cutting of the elastic

extensible members

15, 16, 19 for forming the non-extensible region a1 is performed only at one position in the width direction of the non-extensible region a1, the extra elastic extensible member 18 is constituted only by the portion left after the cutting which is continuous with the elastic

extensible members

15, 16, 19 of the extensible region a2, and although it depends on the width of the non-extensible region a1, the extra elastic extensible member 18 is basically long. In particular, as shown in fig. 14 (b), if the cutting of the

elastic stretching members

15, 16, 19 for forming the non-stretching region a1 is performed at a position other than the center in the width direction of the non-stretching region a1, an extra elastic stretching member continuing to the

elastic stretching members

15, 16, 19 of the stretching region a2 on one side in the width direction remains extremely long. However, if the folded portion 20 is provided, the gap 12i between the display sheet 25 and the inner sheet layer 12H is less likely to open to the crotch side, and therefore, the extra elastic stretching member 18 is less likely to be exposed.

In the above example, the crotch-side folded back portion 20 is provided on both the front outer cover 12F and the rear outer cover 12B, and the crotch-side folded back portion 20 may be provided on only one of the front outer cover 12F and the rear outer cover 12B (including the case where, although the display sheet 25 is provided on both the front outer cover 12F and the rear outer cover 12B, only one of the front outer cover and the rear outer cover has the crotch-side folded back portion 20).

< description of words in the specification >)

Unless otherwise specified in the specification, the following terms in the specification have the following meanings.

"front-rear (longitudinal) direction" means a direction connecting the ventral side (front side) and the dorsal side (rear side), and "width direction" means a direction perpendicular to the front-rear direction (left-right direction).

"elongation" refers to the value at 100% natural length.

"weight per unit area" was measured as follows. The sample or test piece is preliminarily dried and then placed in a test room or apparatus in a standard state (the temperature in the test site is 20. + -. 5 ℃ and the relative humidity is 65% or less) so as to be in a constant state. The preliminary drying is to make the sample or the test piece constant in an environment with a relative humidity of 10-25% and a temperature of not more than 50 ℃. In addition, the fibers having a legal moisture content of 0.0% may not be subjected to preliminary drying. From the test piece which became a constant amount, a sample of a size of 200mm × 250mm (+ -2 mm) was cut out using a paper tightness plate (mi panel) (200mm × 250mm, + -2 mm). The weight of the sample was measured, and the weight per square meter was calculated as the weight per unit area by 20 times.

"thickness" using an automatic thickness gauge (KES-G5 portable compression measurement program) under load: 10gf/cm²And the pressurization area: 2cm²Under the conditions of (1) automatically.

The water absorption was measured in accordance with JIS K7223-1996 "method for testing the Water absorption of a super absorbent resin".

The water absorption rate is "time to end point" when JIS K7224-1996 "Water absorption Rate test method for superabsorbent resin" was carried out using 2g of a superabsorbent polymer and 50g of physiological saline.

The test or measurement is carried out in a laboratory or apparatus in a standard state (a test field at a temperature of 20 ± 5 ℃ and a relative humidity of 65% or less) without any description of environmental conditions in the test or measurement.

Industrial applicability

The present invention can be used for the pants-type disposable diaper of the above-described example and the like.

Claims

1. A pants-type disposable diaper comprising: a front side outer body constituting a front body part; a rear side outer body constituting a rear body portion; and an inner body including an absorber, which is provided in a widthwise central portion from an inner surface of the front side outer body to an inner surface of the rear side outer body,

the two side portions of the front side outer covering and the two side portions of the rear side outer covering are joined together to form a waist opening and a pair of left and right leg openings,

the front side exterior body and the rear side exterior body are separated in the front-rear direction,

at least one of the front side outer package and the rear side outer package has a non-stretchable region provided at the middle in the width direction and stretchable regions provided at both sides in the width direction of the non-stretchable region in a range in the front-rear direction including the absorbent body,

the stretchable region is a region having an inner sheet layer made of a thermoplastic resin nonwoven fabric layer, an outer sheet layer made of a thermoplastic resin nonwoven fabric layer, and a plurality of elongated elastic stretchable members attached between the inner sheet layer and the outer sheet layer at intervals in the front-rear direction and in a stretched state in the width direction,

the non-stretch region has: an inner sheet layer and an outer sheet layer continuous with the telescopic region; and an extra elastic member remaining between the inner sheet layer and the outer sheet layer, the extra elastic member being composed of at least one of a cut-off portion of the elastic member which is continuous with the elastic members in the stretchable region and a cut-off portion of the elastic member which is not continuous with the elastic members in both the stretchable regions,

a display sheet which can be visually confirmed from the outside is provided in the non-stretching region,

the melting point of the elastic expansion part is higher than that of the inner sheet layer and that of the outer sheet layer,

it is characterized in that the preparation method is characterized in that,

the display sheet is provided adjacent to the inner side of the outer sheet layer in the non-stretchable region,

the redundant elastic expansion part is not fixed relative to the inner side surface of the display piece and the inner side piece layer,

the display sheet has a thickness of 50-200 μm and a density of 50kg/m³～400kg/m³Is additionally displayed on the crepe paper of the paper,

in the region having the display sheet, a melting mark as a cutting mark of the elastically stretchable and contractible member is present on the inner sheet layer, and a melting mark as a cutting mark of the elastically stretchable and contractible member is not present on the outer sheet layer.

2. A pants-type disposable diaper according to claim 1,

the outer side face of the inner side sheet layer is welded on the inner side face of the display piece.

3. A pants-type disposable diaper according to claim 2,

the air permeability of the crepe paper is 1cc/cm²·sec～50cc/cm²·sec。

4. A pants-type disposable diaper according to any one of claims 1 to 3,

at least the inner side surface of the display sheet is coated with a release agent.

5. A method for producing a pants-type disposable diaper according to claim 1, wherein the method comprises the steps of,

in forming the outer package, after the display sheet and the elastic stretchable member are attached between the inner sheet layer and the outer sheet layer to form a portion to be the stretchable region and a portion to be the non-stretchable region,

and heating the pressurized portion only from the inside of the inner sheet layer while sandwiching and pressurizing the portion from the inside of the inner sheet layer and the outside of the outer sheet layer at the portion to be the non-stretchable region, thereby cutting the elastic stretchable member.

6. The method of manufacturing a pants-type disposable diaper according to claim 5,

the heating is performed at a temperature lower than the melting point of the elastic stretchable member and higher than the melting point of the inner sheet layer and the melting point of the outer sheet layer.

7. A method of manufacturing a pants-type disposable diaper according to claim 5 or 6,

the elastic stretchable member is cut by the heating, and an outer side surface of the inner sheet layer is welded to an inner side surface of the display sheet at the cut position.

8. The method of manufacturing a pants-type disposable diaper according to claim 7,

the air permeability of the display sheet is 1cc/cm²·sec～50cc/cm²·sec。

9. A method of manufacturing a pants-type disposable diaper according to claim 5 or 6,