WO2020195424A1

WO2020195424A1 - Underpants-type disposable wearable article, and method of manufacturing same

Info

Publication number: WO2020195424A1
Application number: PCT/JP2020/007037
Authority: WO
Inventors: 晃平青地
Original assignee: 大王製紙株式会社
Priority date: 2019-03-28
Filing date: 2020-02-21
Publication date: 2020-10-01
Also published as: TW202034878A; JP7139276B2; TWI797424B; JP2020157001A

Abstract

[Problem] To make a side seal part easy to peel off. [Solution] The aforementioned problem is solved when: an exterior body 20 has a first sheet layer 20A and a second sheet layer 20B extending across a stretchable region 80, a side non-stretchable region 71, and a side seal part 21, and has an elastic sheet 30 that extends across the stretchable region 80 and the side non-stretchable region 71 and is interposed between the first sheet layer 20A and the second sheet layer 20B; in the stretchable region 80, the first sheet layer 20A and the second sheet layer 20B are bonded at a large number of sheet bonding parts 40 through bonding holes 31 penetrating the elastic sheet 30; the side non-stretchable region 71 does not have the first sheet layer 20A and the second sheet layer 20B bonded therein, and the elastic sheet 30 contracts toward the stretchable region 80 without affecting the first sheet layer 20A and the second sheet layer 20B; and the portions of the side seal part 21 except for at least the side edges do not contain the elastic sheet 30 or a melt thereof.

Description

Pants type disposable wear items and their manufacturing methods

The present invention relates to a pants-type disposable wear article having an elastic structure in which an elastic sheet such as an elastic film is sandwiched between a first sheet layer and a second sheet layer, and a method for manufacturing the same.

Pants-type disposable diapers are an exterior body that constitutes at least the waist circumference of the front body and the waist circumference of the back body, and an interior body that includes an absorber attached to the inner surface of the exterior body so as to extend from the front body to the back body. A waist opening and a pair of left and right leg openings are formed by welding both side edges of the front body exterior body and both side edges of the rear body exterior body to form a side seal portion. What is common.

The outer body of the pants-type disposable diaper is provided with an elastic member to add elasticity to the waist circumference region, which is defined as the front-back direction range (the front-back direction range from the waist opening to the upper end of the leg opening) having the side seal portion. Is common. As an elastic member, a method of arranging and fixing a large number of elongated elastic elastic members such as rubber threads in a stretched state in the longitudinal direction has been widely adopted, but an elastic film is used as an excellent surface fit. A method of attaching the film in a stretched state in the direction of imparting elasticity has also been proposed. (See, for example, Patent Documents 1 to 8).

In the stretchable structure including the elastic sheet, the elastic film is laminated between the first sheet layer and the second sheet layer, and the elastic film is stretched in the stretchable direction, and the first sheet layer and the second sheet are stretched. The layers are formed by joining through joint holes formed in an elastic film with a large number of point-shaped sheet joints arranged at intervals in the stretching direction and the direction orthogonal to the stretching direction. In this stretchable structure, in the natural length state, as the elastic sheet contracts between the sheet joints, the distance between the sheet joints becomes narrower, and the stretch direction between the sheet joints in the first sheet layer and the second sheet layer. A fold extending in the direction intersecting with is formed. On the contrary, at the time of elongation, as the elastic sheet extends between the sheet joints, the distance between the sheet joints and the folds in the first sheet layer and the second sheet layer expand, and the first sheet layer and the second sheet layer are completely extended. Elastic elongation is possible up to the unfolded state. The elastic structure made of this elastic sheet is excellent in surface fit, and there is no bonding between the first sheet layer and the second sheet layer and the elastic sheet, and the first sheet layer and the second sheet layer are also bonded. Since it is extremely small, it is very flexible, and there is an advantage that the joint holes of the elastic sheet also contribute to the improvement of air permeability.

On the other hand, when removing the pants-type disposable wear item from the body after excretion, the waist part of the front body and the waist part of the back body are grasped by hand, and the side seal part is opened to the left and right to open the legs from the waist opening. The front body and the back body are peeled off in order (including interfacial peeling and base material destruction along the periphery of the welded portion) to facilitate removal. For this reason, the side seal portion is required not only to have a peeling strength that does not tear during mounting, but also to be easy to peel off after use.

However, if an elastic structure is used for the exterior of the pants-type disposable wear item, the side seal portion will be difficult to peel off, and when the side seal portion is peeled off, either the front body or the back body will be in the width direction. There was a problem that it became easy to tear laterally toward the center side (hereinafter referred to as lateral tearing).

Japanese Unexamined Patent Publication No. 2016-189932 Japanese Unexamined Patent Publication No. 2015-204982 JP-A-2016-140477 Japanese Unexamined Patent Publication No. 2016-189931 Japanese Unexamined Patent Publication No. 2016-189933 Japanese Unexamined Patent Publication No. 2017-064224 Japanese Unexamined Patent Publication No. 2017-148169 JP-A-2017-225508

Therefore, a main object of the present invention is to make it easy to peel off the side seal portion in a pants-type disposable wear article having an elastic structure with an elastic sheet.

The welding pattern of the side seal is the most well-known factor that affects the peelability of the side seal. Therefore, it was initially considered to improve the pattern of the side seal portion. However, in the pants-type disposable wearable article having an elastic structure made of an elastic sheet, the cause of making the side seal portion difficult to peel off is hidden more than the pattern of the side seal portion. That is, in the conventional pants-type disposable wear article having an elastic structure with an elastic sheet, the side seal portion is welded in a state where the elastic sheet is present at the portion to be the side seal portion, and the elastic sheet is formed at the welded portion. By melting and solidifying, the adhesive strength was strengthened more than necessary. The pants-type disposable wear items described below are based on this finding.

<First aspect>
An integrated exterior body extending from the front body to the back body, or an exterior body provided separately on the front body and the back body, and an interior body attached to the middle part in the width direction of the exterior body and covering both front and rear sides of the crotch part. A side seal portion in which both side portions of the exterior body on the front body and both side portions of the exterior body on the rear body are welded, a waist opening and a pair of left and right leg openings are provided.
The exterior body has a side non-stretchable region located at an end portion adjacent to the side seal portion, and a stretchable region adjacent to the side of the side non-stretchable region opposite to the side seal portion.

The exterior body extends over the stretchable region, the side non-stretchable region and the side seal portion, the first sheet layer and the second sheet layer, the stretchable region and the side non-stretchable region, and the first sheet layer and the said. It has an elastic sheet interposed between the second sheet layers,
The elastic region is a region that can be expanded and contracted in the width direction by elastic expansion and contraction of the elastic sheet.
In the stretchable region, the first sheet layer and the second sheet layer are joined through a joint hole penetrating the elastic sheet or through the elastic sheet at a large number of sheet joints arranged at intervals. And
In the side non-stretchable region, the first sheet layer and the second sheet layer are not joined, and the elastic sheet contracts toward the stretchable region side without the first sheet layer and the second sheet layer. And
The elastic sheet and its melt are not contained in at least a portion of the side seal portion other than the side edge portion.
Pants-type disposable wear items that are characterized by this.

(Action effect)
In this pants-type disposable wearable article, the exterior body has a side non-stretchable region located at an end adjacent to the side seal portion and an elastic region adjacent to the side seal portion of this side non-stretchable region. Although it has a first sheet layer and a second sheet layer extending from the stretchable region to the side seal portion, in the side non-stretchable region, the elastic sheet is on the stretchable region side without the first sheet layer and the second sheet layer. The elastic sheet and its melt are not contained in at least the portion of the side seal portion other than the side edge portion. As a result, the adhesive force is not enhanced by melting and solidifying the elastic sheet in the side seal portion, so that the side seal portion is easily peeled off.

<Second aspect>
The maximum elongation of the stretchable region is T, the widthwise dimension of the side non-stretchable region is W1, the widthwise dimension of the side seal portion is W2, and the width of the elastic sheet located in the side non-stretchable region is W3. When
1.1 ・ W3 <W1 <3.0 ・ W3
Satisfy the relationship,
The pants-type disposable wear article of the first aspect.

(Action effect)
The dimensions of the side non-stretchable region can be appropriately determined, but if it is within the above range, the elastic sheet does not easily overlap the side seal portion, the side non-stretchable region is not excessively wide, and the elasticity is significantly reduced. It is preferable because it does not become.

<Third aspect>
A method for manufacturing a pants-type disposable wear article according to the first aspect.
A portion formed by sandwiching the elastic sheet continuous in the MD direction in a stretched state in the MD direction between the first sheet layer continuous in the MD direction and the second sheet layer continuous in the MD direction. By forming the sheet joint portion and not forming the sheet joint portion in the portion to be the side non-stretchable region, an exterior strip-shaped body in which the unit portion serving as the exterior body of each disposable worn article repeats in the MD direction is formed. The exterior assembly process to be formed and
The interior body mounting process of mounting the interior body to the exterior strip,
A side seal portion is formed by welding the portions of the front body on both sides of the exterior and the portions of the rear body on both sides of the exterior strip to which the interior is attached. Including the process
Between the exterior body assembly step and the side seal portion forming step, the elastic sheet is divided in the MD direction at one of the side seal portions or the side non-stretchable region, and the elastic sheet expands and contracts. The side portion located on the portion side of the side seal portion with respect to the region portion is contracted and pulled into the portion serving as the side non-stretchable region.
A method for manufacturing pants-type disposable wear items, which is characterized by the fact that.

(Action effect)
In this way, by forming the sheet joint portion of the stretchable region with the elastic sheet present up to the side seal portion, the elastic sheet is securely fixed between the first sheet layer and the second sheet layer in the stretchable region. Can be done. After that, before welding the side seal portion, the elastic sheet is cut at one place of the side seal portion or the side non-stretchable region, and the side portion located on the side seal portion side of the elastic sheet stretchable region. By shrinking and pulling it into the side non-stretchable region, welding can be performed in the side seal portion forming step in a state where the elastic sheet does not exist in the portion to be the side seal portion. Therefore, according to this manufacturing method, the adhesive force is not enhanced by melting and solidifying the elastic sheet in the side seal portion, so that the side seal portion is easily peeled off in the manufactured pants-type disposable wear article. ..

<Fourth aspect>
A method for manufacturing a pants-type disposable wear article according to the first aspect.
A portion formed by sandwiching the elastic sheet continuous in the MD direction in a stretched state in the MD direction between the first sheet layer continuous in the MD direction and the second sheet layer continuous in the MD direction. By forming the sheet joint portion and not forming the sheet joint portion in the portion to be the side non-stretchable region, an exterior strip-shaped body in which the unit portion serving as the exterior body of each disposable worn article repeats in the MD direction is formed. The exterior assembly process to be formed and
The interior body mounting process of mounting the interior body to the exterior strip,
A side seal portion is formed by welding the portions of the front body on both sides of the exterior and the portions of the rear body on both sides of the exterior strip to which the interior is attached. Including the process
In the side seal portion forming step, the elastic sheet is divided in the MD direction at one portion of the side non-stretchable region located on the downstream side in the MD direction of the formation position of the side seal portion, and the elastic sheet is described. The portion located between the split position and the stretchable region on the upstream side thereof is contracted and pulled into the portion that becomes the side non-stretchable region located on the upstream side in the MD direction of the formation position of the side seal portion. ,
A method for manufacturing pants-type disposable wear items, which is characterized by the fact that.

(Action effect)
In this way, by forming the sheet joint portion of the stretchable region with the elastic sheet present up to the side seal portion, the elastic sheet is securely fixed between the first sheet layer and the second sheet layer in the stretchable region. Can be done. After that, in the side seal portion forming step, the elastic sheet is cut at the portion that becomes the side non-stretchable region on the downstream side in the MD direction and pulled into the portion that becomes the side non-stretchable region on the opposite side, thereby forming the side seal portion. Welding can be performed in a state where the elastic sheet does not exist at the portion serving as the side seal portion. Therefore, according to this manufacturing method, the adhesive force is not enhanced by melting and solidifying the elastic sheet in the side seal portion, so that the side seal portion is easily peeled off in the manufactured pants-type disposable wear article. ..

<Fifth aspect>
A method for manufacturing a pants-type disposable wear article according to the first aspect.
A portion formed by sandwiching the elastic sheet continuous in the MD direction in a stretched state in the MD direction between the first sheet layer continuous in the MD direction and the second sheet layer continuous in the MD direction. By forming the sheet joint portion and not forming the sheet joint portion in the portion to be the side non-stretchable region, an exterior strip-shaped body in which the unit portion serving as the exterior body of each disposable worn article repeats in the MD direction is formed. The exterior assembly process to be formed and
The interior body mounting process of mounting the interior body to the exterior strip,
A side seal portion is formed by welding the portions of the front body on both sides of the exterior and the portions of the rear body on both sides of the exterior strip to which the interior is attached. Including the process
In the exterior body assembly step, the elastic sheet is divided in the MD direction at one part of the side non-stretchable region located on the upstream side in the MD direction of the portion to be the side seal portion, and at the same time, the division is performed. The sheet joint is formed in a portion adjacent to the upstream side of the position in the MD direction, and the portion located between the split position in the elastic sheet and the portion to be the expansion / contraction region on the downstream side thereof is contracted. , The side seal portion is pulled into the side non-stretchable region located on the downstream side in the MD direction.
A method for manufacturing pants-type disposable wear items, which is characterized by the fact that.

(Action effect)
In this way, by forming the sheet joint portion of the stretchable region with the elastic sheet present up to the side seal portion, the elastic sheet is securely fixed between the first sheet layer and the second sheet layer in the stretchable region. Can be done. Then, at the same time as starting to form the sheet joint portion of the stretchable region on the upstream side in the MD direction of the side seal portion, the elastic sheet is cut at the portion that becomes the side non-stretchable region on the upstream side in the MD direction, and the opposite side non-stretchable region is formed. By pulling it into the portion to be the region, welding can be performed in the side seal portion forming step in a state where the elastic sheet does not exist in the portion to be the side seal portion. Therefore, according to this manufacturing method, the adhesive force is not enhanced by melting and solidifying the elastic sheet in the side seal portion, so that the side seal portion is easily peeled off in the manufactured pants-type disposable wear article. ..

According to the present invention, in a pants-type disposable wear item having an elastic structure with an elastic sheet, the side seal portion is easily peeled off, and the like is brought about.

It is a plan view (inner surface side) of the pants type disposable diaper in the unfolded state. It is a plan view (outer surface side) of the pants type disposable diaper in the unfolded state. It is a top view which shows only the main part of the pants type disposable diaper in the unfolded state. (A) is a sectional view taken along the line CC of FIG. 1, and (b) is a sectional view taken along the line EE of FIG. FIG. 1 is a cross-sectional view taken along the line AA of FIG. It is a cross-sectional view of BB of FIG. It is a plan view (outer surface side) of the pants type disposable diaper in the unfolded state. (A) is a sectional view taken along the line CC of FIG. 7, and FIG. 7B is a sectional view taken along the line EE of FIG. (A) is a plan view of a main part of the expansion / contraction region, (b) is a sectional view taken along line DD of (a), (c) is a sectional view taken in a mounted state, and (d) is a sectional view taken in a natural length state. It is a top view which shows various shapes of a sheet joint part. It is a top view of the expansion and contraction area in the expanded state. It is a top view which shows the main part of the expansion and contraction area in an expanded state in an enlarged manner. It is a top view which shows the main part of the expansion and contraction region of a natural length state in an enlarged manner. (A) is a cross-sectional view taken along the line DD of FIG. 12, and (b) is a cross-sectional view taken along the line in the natural length state. It is a top view of the expansion and contraction area in the expanded state. It is a top view which shows the main part of the expansion and contraction area in an expanded state in an enlarged manner. It is a top view which shows the main part of the expansion and contraction region of a natural length state in an enlarged manner. It is sectional drawing which shows roughly the cross section of the main part of the exterior body extended to some extent. It is sectional drawing which shows roughly the cross section of the main part of the exterior body extended to some extent. (A) is a trace view of a plan photograph of a sheet joint formed in the first welded form, and (b) is a trace view of a plan photograph of a sheet joint formed in the third welded form. (A) is a plan view of a main part of a non-stretchable region, (b) is a cross-sectional view taken along the line DD of (a), (c) is a cross-sectional view taken in a mounted state, and (d) is a cross-sectional view taken in a natural length state. It is a main part plan view of a non-stretchable region. It is the schematic of the ultrasonic sealing apparatus. It is the schematic which shows the manufacturing flow of the pants type disposable diaper. It is an enlarged plan view which shows the main part of the pants type disposable diaper in the unfolded state. It is sectional drawing which shows the change in the vicinity of the side seal portion at the time of manufacturing. It is sectional drawing which shows the change in the vicinity of the side seal portion at the time of manufacturing. It is sectional drawing which shows the change in the vicinity of the side seal portion at the time of manufacturing.

Hereinafter, examples of disposable items will be described in detail based on the pants-type disposable diapers shown in the attached drawings. The dotted pattern portion in the figure shows an adhesive as a joining means for joining the constituent members located on the front side and the back side, and is a solid, bead, curtain, summit or spiral coating of hot melt adhesive, or The fixed portion of the elastic member is formed by pattern coating (transfer of hot melt adhesive by the letterpress method) or by coating the elastic member on the outer peripheral surface of the elastic member such as comb gun or sure wrap coating instead of or together with this. It is a thing. Examples of the hot melt adhesive include EVA type, adhesive rubber type (elastomer type), olefin type, polyester / polyamide type and the like, but they can be used without particular limitation. As the joining means for joining the constituent members, a means by welding materials such as a heat seal and an ultrasonic seal can also be used.

Further, as the non-woven fabric in the following description, a known non-woven fabric can be appropriately used depending on the site and purpose. Examples of the constituent fibers of the non-woven fabric include olefin-based fibers such as polyethylene and polypropylene, polyester-based and polyamide-based synthetic fibers (including single-component fibers and composite fibers such as core sheaths), as well as recycled rayon and cupra. Fibers, natural fibers such as cotton, and the like can be selected without particular limitation, and these can be mixed and used. In order to increase the flexibility of the non-woven fabric, it is preferable that the constituent fibers are crimped fibers. Further, even if the constituent fibers of the non-woven fabric are hydrophilic fibers (including hydrophilic fibers made hydrophilic by a hydrophilic agent), hydrophobic fibers or water-repellent fibers (water-repellent made by a water-repellent agent) It may be (including aqueous fibers). In addition, the non-woven fabric generally has a short fiber non-woven fabric, a long fiber non-woven fabric, a spunbond non-woven fabric, a melt blown non-woven fabric, a spunlace non-woven fabric, a thermal bond (air-through) non-woven fabric, and a needle punch depending on the fiber length, the sheet forming method, the fiber bonding method, and the laminated structure. Non-woven fabric, point-bonded non-woven fabric, laminated non-woven fabric (SSS non-woven fabric in which the same or similar non-woven fabric layer is laminated, SMS non-woven fabric in which different non-woven fabric layers are laminated, and a melt blown layer sandwiched between spunbond layers, SMMS non-woven fabric, etc.), etc. Any of these non-woven fabrics can be used. Laminated non-woven fabric means that it is manufactured as an integral non-woven fabric including all layers and fiber-bonding processing is performed over all layers, and a plurality of separately manufactured non-woven fabrics are attached by a joining means such as a hot melt adhesive. Does not include combined items.

FIGS. 1 to 6 show pants-type disposable diapers. The symbol LD (vertical direction) indicates the front-back direction, and WD indicates the width direction. This pants-type disposable diaper (hereinafter, also simply referred to as a diaper) has an outer body 20 forming a front body F and a back body B, and an inner body 10 fixed and integrated to the inner surface of the outer body 20. The interior body 10 is formed by interposing an absorber 13 between the liquid-permeable top sheet 11 and the liquid-impermeable sheet 12. In manufacturing, after the back surface of the interior body 10 is joined to the inner surface (upper surface) of the exterior body 20 by a joining means such as a hot melt adhesive, the interior body 10 and the exterior body 20 are joined to the front body F and the back body B. It is folded at the center of the front-rear LD (longitudinal direction), which is the boundary between the two, and both side portions thereof are joined to each other by welding to form the side seal portion 21. By forming the side seal portion 21, a waist opening and a pair of left and right leg openings are formed.

(Example of interior structure)
As shown in FIGS. 4 to 6, the interior body 10 has a structure in which an absorber 13 is interposed between a top sheet 11 and a liquid-impermeable sheet 12 made of polyethylene or the like, and has a top. It absorbs and retains the excrement liquid that has passed through the sheet 11. The planar shape of the interior body 10 is not particularly limited, but it is generally substantially rectangular as shown in FIG.

As the top sheet 11 that covers the front side (skin side) of the absorber 13, a perforated or non-perforated non-woven fabric, a porous plastic sheet, or the like is preferably used.

As the liquid-impermeable sheet 12 that covers the back side (non-skin contact side) of the absorber 13, a liquid-impermeable plastic sheet such as polyethylene or polypropylene can be used, and has moisture permeability particularly from the viewpoint of preventing stuffiness. A microporous sheet obtained by melting and kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet and then stretching it in a uniaxial or biaxial direction can be preferably used.

The absorber 13 is basically a known material, for example, a stack of pulp fibers, an aggregate of filaments such as cellulose acetate, or a non-woven fabric, and a highly absorbent polymer is mixed or fixed as necessary. Can be used. The absorber 13 can be wrapped with a wrapping sheet 14 having liquid permeability and liquid retention, such as crepe paper, if necessary, in order to retain the shape and polymer.

The shape of the absorber 13 is formed in a substantially hourglass shape having a constricted portion 13N narrower than both front and rear sides in the crotch portion. The dimensions of the constricted portion 13N can be appropriately determined, but the length of the constricted portion 13N in the front-rear direction can be about 20 to 50% of the total length of the diaper, and the width of the narrowest portion is 40 of the total width of the absorber 13. It can be about 60%. In the case of having such a constricted portion 13N, if the planar shape of the interior body 10 is substantially rectangular, the portion of the interior body 10 corresponding to the constricted portion 13N of the absorber 13 does not have the absorber 13. The absorber side portion 17 is formed.

The liquid impermeable sheet 12 is folded back together with the top sheet 11 on both sides of the absorber 13 in the width direction. As the liquid permeable sheet 12, it is desirable to use an opaque sheet so that brown color such as defecation and urine does not appear. As the opacity, a plastic in which pigments such as calcium carbonate, titanium oxide, zinc oxide, white carbon, clay, talc, and barium sulfate and a filler are added and formed into a film is preferably used.

Three-dimensional gathers 90 that fit around the legs are formed on both sides of the interior body 10. As shown in FIGS. 5 and 6, the three-dimensional gather 90 has a fixed portion 91 fixed to the side portion of the back surface of the interior body 10, and the interior body 10 from the fixed portion 91 via the side of the interior body 10. With the main body 92 extending to the side of the surface of the main body 92 and the front and rear ends of the main body 92 in an inverted state, the hot melt adhesive 95b or the like is applied to the side of the surface (top sheet 11 in the illustrated example) of the interior body 10. It has an inverted portion 93 formed by being fixed, and a free portion 94 formed so as not to be fixed between the inverted portions 93. Each of these parts is formed of a gather sheet 95 made by folding a sheet such as a non-woven fabric into a double sheet. The gather sheet 95 is attached to the entire interior body 10 in the front-rear direction, the inverted portion 93 is provided on the front side and the rear side of the non-absorbent body side portion 17, and the free portion 94 is provided on both front and rear sides of the non-absorbent body side portion 17. It has been postponed. Further, between the double gather sheets 95, a gather elastic member 96 is arranged at the tip of a free portion or the like. The gather elastic member 96 is for raising the free portion 94 by the elastic contraction force as shown in FIG. 5 in the product state.

The fixed structure of the gather elastic member 96 and the gather sheet 95 is not particularly limited, and as in the examples shown in FIGS. 5 and 6, for example, except for the lodging portion 93, the gather elastic member 96 is located at the position of the gather elastic member 96 via a hot melt adhesive. Although the gather elastic member 96 is adhesively fixed to the gather sheet 95 and the facing surfaces of the gather sheet 95 are joined, there is no hot melt adhesive at the position of the gather elastic member 96 in the inverted portion 93, and therefore the gather elasticity. A structure can be adopted in which the member 96 and the gather sheet 95 are not adhered to each other, and the facing surfaces of the gather sheet 95 are not joined at the position where the gather elastic member 96 is held.

As the gather elastic member 96, commonly used materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicone, and polyester can be used. Further, in order to make it difficult to see from the outside, it is preferable to dispose of the thickness at 925 dtex or less, the tension at 150 to 350%, and the interval at 7.0 mm or less. As the gather elastic member 96, in addition to the elongated shape as shown in the illustrated example, a tape shape having a certain width can also be used.

Various non-woven fabrics can be used as the gather sheet 95, but in particular, it is preferable to use a non-woven fabric having a low basis weight and excellent breathability in order to prevent stuffiness. Further, regarding the gather sheet 95, in order to prevent the permeation of urine and the like, prevent fogging, and enhance the feel (dry feeling) to the skin, silicone-based, paraffin metal-based, alkylchromic chloride-based water repellent, etc. It is desirable to use a water-repellent treated non-woven fabric coated with.

As shown in FIGS. 3 to 6, the back surface of the interior body 10 is joined to the inner surface of the exterior body 20 by a hot melt adhesive or the like in the inner / outer fixed region 10B (diagonal line region). The inside / outside fixed region 10B can be appropriately defined and can be almost the entire width direction WD of the interior body 10, but it is preferable that both ends in the width direction are not fixed to the exterior body 20.

(Structural example of exterior body)
The exterior body 20 has at least a waist circumference T of the front body F and a waist circumference T of the back body B, and in the illustrated example, between the waist circumference T of the front body F and the waist circumference T of the back body B. It further has an intermediate portion L which is a range in the front-rear direction of. In the crotch portion of the exterior body 20, the side edge of the exterior body 20 may be located on the center side in the width direction of the side edge of the interior body 10, or may be located on the outside in the width direction.

Then, in the exterior body 20 of the illustrated example, as shown in FIGS. 2 and 4 to 6, except for the middle portion L in the front-rear direction, between the first sheet layer 20A and the second sheet layer 20B. The elastic sheet 30 is interposed, and as shown in FIG. 9, the first sheet layer 20A and the second sheet layer 20B penetrate the elastic sheet 30 at a large number of sheet joints 40 arranged at intervals. It has an elastic sheet telescopic structure 20X joined through a joining hole 31 to be joined. Although not shown, the first sheet layer 20A and the second sheet layer 20B may be joined via the elastic sheet 30 by a large number of sheet joining portions 40 arranged at intervals. Then, the region having the elastic sheet expansion / contraction structure is contracted in the width direction due to the contraction of the elastic sheet 30 and is expandable in the width direction (that is, the expansion / contraction direction ED becomes the width direction WD of the diaper). Have.

The planar shape of the exterior body 20 is formed by concave leg circumference lines 29 so that both side edges in the width direction of the intermediate portion L form leg openings, respectively, and has a shape similar to an hourglass as a whole. The exterior body 20 may be individually formed by the front body F and the back body B, and may be arranged so as to be separated from each other in the front-rear direction LD of the diaper at the crotch portion.

The form shown in FIGS. 1 and 2 is a form in which the elastic sheet telescopic structure 20X extends to the waist end portion 23, but when the elastic sheet telescopic structure 20X is used for the waist end portion 23, the waist end portion 23 If necessary, such as insufficient tightening, the waist end 23 is not provided with the elastic sheet elastic structure 20X as shown in FIGS. 7 and 8, and is expanded and contracted by the conventional elongated waist elastic member 24. A structure can also be provided. The waist elastic member 24 is an elongated elastic member such as a plurality of elastic threads arranged at intervals in the front-rear direction LD, and gives an elastic force so as to tighten around the waist of the body. The waist elastic members 24 are not substantially arranged as a bundle at close intervals, but are three or more at intervals of about 3 to 8 mm in the front-rear direction so as to form a predetermined expansion / contraction zone. , Preferably 5 or more are arranged. The elongation rate at the time of fixing the waist elastic member 24 can be appropriately determined, but in the case of a normal adult, it can be about 230 to 320%. As the waist elastic member 24, thread rubber is used in the illustrated example, but other elongated elastic members such as flat rubber may be used. Although not shown, an elastic sheet 30 may be provided at the waist end 23, and an elongated waist elastic member 24 may be provided at a position overlapping the elastic sheet 30 to form an elastic structure composed of both elastic members. Further, in the illustrated embodiment, the edge portion of the leg opening in the exterior body 20 is not provided with the elongated elastic member extending along the leg opening, but at a position overlapping with the elastic sheet 30 in the edge portion or the edge. An elongated elastic member may be provided instead of the elastic sheet 30 of the portion.

As another form, although not shown, the elastic sheet elastic structure 20X is not provided in the intermediate portion L between the waist circumference T of the front body F and the waist circumference T of the back body B, or the front body. An elastic sheet elastic structure 20X is continuously provided in the front-rear direction LD from the inside of the waist circumference T of F through the middle portion L to the inside of the waist circumference T of the back body B, or either the front body F or the back body B is provided. Appropriate deformation is also possible, such as providing an elastic sheet telescopic structure 20X only on the surface.

(Expandable area)
The region of the exterior body 20 having the elastic sheet telescopic structure 20X has a stretchable region that can be stretched in the width direction WD. In the expansion / contraction region 80, the elastic sheet 30 is contracted in the width direction WD due to the contraction force, and can be expanded in the width direction WD. More specifically, in a state where the elastic sheet 30 is extended in the width direction WD, the elastic sheet 30 is separated from each other in the width direction WD and the front-rear direction LD (direction LD orthogonal to the expansion / contraction direction) orthogonal to the width direction WD. The elastic sheet elastic structure 20X is formed by joining the first sheet layer 20A and the second sheet layer 20B through the joint hole 31 to form a large number of sheet joint portions 40, and the elastic sheet 30 is formed in the elastic region 80. The sheet joint 40 is arranged so that the first sheet layer 20A and the second sheet layer 20B are contracted by the contraction force of the elastic sheet 30 to form the contraction folds 25, while remaining uninterrupted in the width direction WD. Thereby, such elasticity can be imparted.

In the stretchable region 80, even if the elastic sheet 30 has a portion 32 linearly continuous along the width direction WD as in the example shown in FIG. 9, as in the example shown in FIG. 11 and the example shown in FIG. You do not have to have it.

In the natural length state, the stretchable region 80 expands in the direction in which the first sheet layer 20A and the second sheet layer 20B between the sheet joints 40 are separated from each other as shown in FIGS. The contraction folds 25 extending in the direction LD are formed, and the contraction folds 25 are extended but remain even in the wearing state in which the contraction folds 25 extend in the width direction WD to some extent. Further, as shown in the illustrated embodiment, the first sheet layer 20A and the second sheet layer 20B are not joined to the elastic sheet 30 except between the first sheet layer 20A and the second sheet layer 20B at least in the sheet joining portion 40. As can be seen from FIG. 9C assuming a mounted state and FIG. 9A assuming an unfolded state of the first sheet layer 20A and the second sheet layer 20B, in these states, the elastic sheet 30 Even if the edge of the joint hole 31 is separated from the outer peripheral edge of the sheet joint 40 in the expansion / contraction direction and the ventilation hole 33 (gap) is opened, and the material of the elastic sheet 30 is a non-perforated film or sheet, this passage is achieved. Breathability is added by the pores 33. In particular, when the elastic sheet 30 has a portion 32 linearly continuous along the width direction WD, in the natural length state, the joint hole 31 is narrowed due to further contraction of the elastic sheet 30, and the joint hole 31 is narrowed. A gap is hardly formed between the 31 and the sheet joint 40, and when the elastic sheet 30 does not have a linearly continuous portion along the width direction WD, the ventilation hole 33 remains.

It is desirable that the maximum elongation of the WD in the width direction of the expansion / contraction region 80 is 190% or more (preferably 200 to 220%). The maximum elongation of the stretchable region 80 is substantially determined by the stretch ratio of the elastic sheet 30 at the time of manufacture, but based on this, it is lowered by a factor that inhibits the shrinkage of the WD in the width direction. The main factor of such an inhibitory factor is the ratio of the length L of the sheet joint 40 to the unit length in the width direction WD, and the larger the ratio, the lower the maximum elongation. In a normal case, since the length L of the sheet joint 40 correlates with the area ratio of the sheet joint 40, the maximum elongation of the expansion / contraction region 80 can be adjusted by the area ratio of the sheet joint 40.

The elongation stress of the expansion / contraction region 80 is mainly the width of the elastic sheet 30 when the elastic sheet 30 has a portion 32 linearly continuous along the width direction WD as shown in the example shown in FIG. It can be adjusted by the sum of the orthogonal dimensions 32w (equal to the joint hole spacing 31d) of the portions 32 (see FIG. 9A) that are linearly continuous along the direction WD. On the other hand, when the elastic sheet 30 does not have a portion linearly continuous along the width direction WD as in the example shown in FIG. 11 and the example shown in FIG. 15, the elongation stress of the expansion / contraction region 80 is increased. It can be adjusted by the intersection angle formed by the continuous direction of the

non-joining bands

51 and 52 and the expansion and contraction direction ED where the parts having no sheet joint are continuous, and normally, the continuous direction and expansion and contraction of the

non-joining bands

51 and 52 in the deployed state. It is preferable that the acute-angled crossing angles θ1 and θ2 formed by the direction ED are larger than 0 degrees and 45 degrees or less, particularly in the range of 10 to 30 degrees.

The area ratio of the sheet joint 40 in the expansion / contraction region 80 and the area of each sheet joint 40 can be appropriately determined, but usually, it is preferably within the following range.
Area of sheet joint 40: 0.14 to 3.5 mm ² (particularly 0.14 to 1.0 mm ² )
Area ratio of sheet joint 40: 1.8 to 19.1% (especially 1.8 to 10.6%)
In this way, the maximum elongation and elongation stress of the expansion / contraction region 80 can be adjusted by the area of the sheet joint 40. Therefore, as shown in FIG. 7, a plurality of regions having different area ratios of the sheet joint 40 are formed in the expansion / contraction region 80. It can be provided and the fit can be changed according to the part. In the form shown in FIG. 7, the edge region 82 of the leg opening has a higher area ratio of the sheet joint 40 than the other regions, and therefore has a weak elongation stress and is a region that flexibly expands and contracts.

The shapes of the individual sheet joints 40 and the joint holes 31 in their natural lengths can be appropriately determined, but are perfect circles, ellipses, triangles, rectangles (see FIGS. 9, 11, and 15), and diamonds (see FIGS. 9, 11, and 15). It can be a polygon such as 10 (b)), a convex lens shape (see FIG. 10 (a)), a concave lens shape (see FIG. 10 (c)), a star shape, a cloud shape, or any other shape. The dimensions of the individual sheet joints are not particularly limited, but the maximum length 40y (approximately equal to the dimension 31y in the orthogonal direction of the joint hole 31) is 0.5 to 3.0 mm, particularly 0.7 to 1.1 mm. The maximum width of 40x is preferably 0.1 to 3.0 mm, and particularly preferably 0.1 to 1.1 mm in the case of a shape long in the direction XD orthogonal to the expansion / contraction direction.

The arrangement pattern of the sheet joint portion 40 of the expansion / contraction region 80 is not particularly limited, and any pattern (see, for example, Patent Documents 1 to 8) can be adopted, and in particular, the example shown in FIG. 9 and the example shown in FIG. 11 And, as in the example shown in FIG. 15, it is preferable that non-joining bands having continuous portions having no sheet joining portion exist in an oblique lattice pattern. The illustrated example shows a particularly preferable example, and the stretchable region 80 has an acute angle (with respect to the stretchable direction ED) as

non-joint bands

51 and 52 in which the portions having no sheet joint portion 40 are continuous in the expanded state. The first non-joint band 51 that is linearly continuous along the first direction 51d intersecting the acute angle side crossing angle θ1) exists repeatedly at intervals in the direction orthogonal to the first direction 51d. Further, a large number of sheet joint portions 40 and joint holes 31 are provided at intervals between the adjacent first non-joining bands 51 in the expansion / contraction region 80. And characteristically, the unit structure including a plurality of first non-joining bands 51 having different first widths 51w determined as widths in the direction orthogonal to the first direction 51d is orthogonal to the first direction 51d in the expansion / contraction region 80. It exists repeatedly in the direction.

As described above, when the unit structure including the plurality of first non-joining bands 51 having different first widths 51w repeatedly exists in the direction orthogonal to the first direction 51d in the elastic region 80, the inside of the first non-joining band 51 A similar width change of magnitude relation is formed in the continuous portion of the elastic sheet 30 of the above. That is, if the width 51w of the first non-joining band 51 is narrow, the width of the continuous portion of the internal elastic sheet 30 is also narrow, and if the width 51w of the first non-joining band 51 is wide, the continuous portion of the internal elastic sheet 30 is continuous. The width of the part also becomes wider. Then, when there is a change in the first width 51w in the continuous portion of the elastic sheet 30 in the first non-joining band 51, the continuous portion of the elastic sheet 30 in the wide first non-joining band 51 and the narrow second 1 As a result of visually emphasizing both continuous portions of the elastic sheet 30 in the non-joint band 51, even if the stretchable region 80 is in the natural length state (see FIGS. 13 and 17), it is in a state of being stretched to some extent. Even if there is, it will have a beautiful appearance with diagonal stripes. That is, in a state of being contracted to some extent, the size of the contraction folds 25 in the first non-joining band 51 changes according to the first width 51w of the first non-joining band 51, and therefore, due to the influence of the contraction folds 25, diagonal stripes The pattern will appear more clearly.

The above-mentioned unit structure is not limited by the degree of the size of the width 51w as long as it includes a plurality of first non-joining bands 51 having different first widths 51w, but the first unit structure in the first non-joining band 51 The width 51w is preferably 1.2 to 60 times larger and 0.01 to 0.8 times smaller than the first non-joining band 51 having the nearest width 51w.

Further, in the above-mentioned unit structure, as long as a plurality of first non-joining bands 51 having different first widths 51w are included, the first width 51w in all the first non-joining bands 51 may be different and is shown. As described above, the first width 51w of some of the plurality of first non-joining bands 51 may be different from the first width 51w of the other single or plurality of first non-joining bands 51.

Even if an oblique striped pattern along the first direction 51d due to the continuous portion of the contraction fold 25 of the first non-joining band 51 and the elastic sheet 30 inside the elastic fold 25 appears in the elastic region 80, another in the same elastic region 80. If the diagonal stripe pattern along the diagonal direction is more strongly visually recognized, the diagonal stripe pattern due to the contraction fold 25 of the first non-joining band 51 and the continuous portion of the elastic sheet 30 inside the first non-joint band 51 may become inconspicuous. On the other hand, the maximum value of the first width 51w in the first non-joining zone 51 is the maximum value of the width in the direction orthogonal to the continuous direction in all the

non-joining zones

51 and 52 having different and common inclination directions. Then, in the expansion / contraction region 80, the diagonal stripe pattern due to the contraction fold 25 of the first non-joining band 51 and the continuous portion of the elastic sheet 30 inside the contraction fold 25 becomes more strongly visible, which is preferable. In this case, the maximum value of the first width 51w in the first non-joining band 51 can be appropriately determined, but it may be 1.2 to 60 times that of the first non-joining band 51 having the nearest width 51w. preferable. The width of all the

non-joining bands

51 and 52 including the first non-joining band 51 is not limited in the direction orthogonal to the continuous direction, but is usually within the range of 0.02 to 5 mm. Is preferable. Needless to say, the width of the

non-joining bands

51 and 52 in the direction orthogonal to the continuous direction is the first width 51w in the first non-joining band 51, which is a linearly continuous portion. Because it is the same width.

The first spacing 51s, which is determined as the spacing in the direction orthogonal to the first direction 51d in the adjacent first non-joining zones 51, can be appropriately determined. Therefore, the first interval 51s may be the same as the first width 51w in the adjacent first non-joining zone 51, may be wider, or may be narrower. As one preferable example, in the unit structure, the maximum value of the first width 51w in the first non-joining zone 51 may be smaller than the maximum value of the first interval 51s. By forming a wide interval portion in the unit structure in this way, the diagonal stripe pattern due to the contraction fold 25 of the first non-joint band 51 and the continuous portion of the elastic sheet 30 inside the contraction fold 25 becomes more strongly visible. .. In this case, the maximum value of the first width 51w in the first non-joining zone 51 can be appropriately determined, but it is preferably 0.01 to 9 times the maximum value of the first interval 51s. The distance between all the

non-joining zones

51 and 52 including the first non-joining zone 51 in the direction orthogonal to the continuous direction is not particularly limited, but is usually within the range of 0.3 to 50 mm. Is preferable. Needless to say, the interval in the direction orthogonal to the continuous direction in the

non-joining zones

51 and 52 is the first interval 51s in the first non-joining zone 51, which is equal to the continuous direction. ..

In the expansion / contraction region 80, the

non-joint bands

51 and 52 are linearly continuous along the second direction 52d intersecting the acute angle (acute angle side intersection angle θ2) with respect to the extension / contraction direction ED other than the first direction 51d. The two non-joining bands 52 may repeatedly exist at intervals in the direction orthogonal to the second direction 52d, or the second non-joining band 52 may not exist. One preferable form having the second non-joining band 52 is that the

non-joining bands

51 and 52 are formed in a diagonal grid pattern in the expansion / contraction region 80, and the first non-joining band 51 is a diagonal grid-like non-joining band. It is a portion of the

bands

51 and 52 that is continuous in one direction, and the second non-joint band 52 is a portion of the diagonal grid-like

non-joint bands

51 and 52 that is continuous in the other direction. In this case, in the first direction 51d and the second direction 52d, the positive and negative of the inclination with respect to the expansion / contraction direction ED are opposite to each other. In addition, as in the example shown in FIG. 11 and the example shown in FIG. 15, even in the form not having the

non-joining bands

51 and 52 continuous in the width direction WD (extension direction ED), the expansion / contraction region 80 is in the expanded state. The acute-angled crossing angles θ1 and θ2 with respect to the expansion / contraction direction ED in the first direction 51d and the second direction 52d are 5 to 45 degrees, particularly 10 to 30, so that sufficient elasticity in the expansion / contraction region 80 is ensured. Can be done.

When the second non-joining band 52 is provided as in the example shown in FIG. 15, the second width 52w determined as the width in the direction orthogonal to the second direction in the second non-joining band 52 is the same or the first. 2 It is preferable to arrange the sheet joint portion 40 so as not to have the non-joint band 52. As a result, in the expansion / contraction region 80, the diagonal stripe pattern due to the contraction fold 25 of the first non-joining band 51 and the continuous portion of the elastic sheet 30 inside the contraction fold 25 becomes more visible.

On the other hand, the sheet joints 40 are aligned in the first direction 51d between the adjacent first non-joint bands 51. In this case, for example, as shown in FIG. 16, all the sheet joints 40 expand and contract. When the acute angle side intersection angle θ3 in the longitudinal direction with respect to the direction orthogonal to the direction ED is within 10 degrees and the maximum dimension 40e of the expansion / contraction direction ED is 0.1 to 0.4 mm, the first non-joint zone is formed. It is preferable because the size of the expansion / contraction direction ED of 51 can be secured larger and the decrease in elasticity can be suppressed.

Further, as in the example shown in FIG. 11, the unit structure includes a wide first non-joining band 51 having a maximum first width 51w and a narrow first non-joining band 51 having a narrower first width 51w. When a plurality of lines are included adjacent to each other in a direction orthogonal to the first direction 51d, the acute angle side intersection angle in the longitudinal direction with respect to the second direction 52d is within 5 degrees between the adjacent wide first unjoined bands 51. Moreover, it is preferable that the sheet joints 40 having an elongated shape with a maximum dimension 40f in the direction orthogonal to the longitudinal direction of 0.1 to 0.4 mm are aligned in the first direction 51d at intervals. Further, between the adjacent narrow first non-joint bands 51, the acute angle side crossing angle θ3 in the longitudinal direction with respect to the first direction 51d is 45 degrees or more, and the maximum dimension 40 g in the direction orthogonal to the longitudinal direction is 0. It is preferable that the sheet joints 40 having an elongated shape of 1 to 0.4 mm are arranged at intervals in the first direction 51d. Due to the shape and arrangement of the sheet joint 40 in this way, the shrinkage fold 25 of the first non-joint band 51 and the continuous portion of the elastic sheet 30 inside the shrinkage fold 25 are particularly visually emphasized with a smaller area of the sheet joint 40. Become so.

The row of the sheet joints 40 (rows in the continuous direction of the non-joining bands 51 and 52) located between the adjacent

non-joining bands

51 and 52 may be one row or a plurality of rows. Further, although the spacing between the sheet joints 40 in the row direction is preferably regular, not all spacings need to be constant, and some spacings may be different.

(Intermediate non-stretchable area)
As shown in FIG. 7, of the region of the exterior body 20 having the elastic sheet elastic structure 20X, a part or all of the portion overlapping the absorber 13 (preferably including almost the entire inner / outer fixed region 10B) is not intermediate. An elastic region 70 can be provided. The arrangement of the stretchable region 80 and the intermediate non-stretchable region 70 can be appropriately determined. For example, the intermediate non-stretchable region 70 may be provided from the region overlapping the absorber 13 to the region not overlapping the absorber 13 located in the width direction WD or the front-rear direction LD. The intermediate non-stretchable region 70 means that the maximum stretch in the stretch direction is 120% or less. The maximum elongation of the intermediate non-stretchable region 70 is preferably 110% or less, and more preferably 100%.

The shape of each sheet joint 40 in the intermediate non-stretchable region 70 is not particularly limited, and can be appropriately selected from the same shapes as those described in the section of the stretchable region 80.

Further, the area ratio of the sheet joint 40 and the area of each sheet joint 40 in the intermediate non-stretchable region can be appropriately determined, but in the normal case, the area of each sheet joint 40 is within the following range. It is preferable that the intermediate non-stretchable region 70 does not become hard due to its small size and low area ratio of the sheet joint portion 40.
Area of sheet joint 40: 0.10 to 0.75 mm ² (particularly 0.10 to 0.35 mm ² )
Area ratio of sheet joint 40: 4 to 13% (especially 5 to 10%)

The intermediate non-stretchable region 70 is formed by densely arranging the sheet joints 40 so that the first sheet layer 20A and the second sheet layer 20B do not shrink due to the contraction force of the elastic sheet 30 to form folds. Can be done. Specific examples of the method for forming the intermediate non-stretchable region 70 include those described in Patent Documents 3 to 6. 21 and 22 show an example of the intermediate non-stretchable region 70 described in Patent Document 6. In the intermediate non-stretchable region 70, the joint holes 31 are arranged in a staggered pattern in a dense arrangement to some extent, and the elastic sheet 30 is continuous in the expansion / contraction direction ED, but is linear along the expansion / contraction direction ED due to the presence of the joint holes 31. It does not have a continuous part. In this case, as shown in FIGS. 21 and 22, the ventilation holes 33 (gap) are opened with a size that is almost the same in both the natural length state and the unfolded state.

(Joint structure of sheet joint)
When the first sheet layer 20A and the second sheet layer 20B in the sheet joint 40 are joined through the joint holes 31 formed in the elastic sheet 30, at least the first sheet layer 20A and the second sheet in the sheet joint 40 are joined. It is desirable that the first sheet layer 20A and the second sheet layer 20B are not joined to the elastic sheet 30 except between the sheet layers 20B.

The joining means of the first sheet layer 20A and the second sheet layer 20B in the sheet joining portion 40 is not particularly limited. For example, the first sheet layer 20A and the second sheet layer 20B in the sheet bonding portion 40 may be bonded by a hot melt adhesive or by a bonding means such as heat sealing or ultrasonic sealing. ..

When the first sheet layer 20A and the second sheet layer 20B are joined through the joining hole 31 of the elastic sheet 30 in the sheet joining portion 40, the form in which the sheet joining portion 40 is formed by material welding is the first in the sheet joining portion 40. A first welded form in which the first sheet layer 20A and the second sheet layer 20B are joined only by a molten solidified product 20m of at least one of the first sheet layer 20A and the second sheet layer 20B (FIG. 18 (a)). ), A second welded form in which the first sheet layer 20A and the second sheet layer 20B are joined only by the molten solidified product 30 m of all or most or part of the elastic sheet 30 at the sheet joining portion 40 (FIG. 18 (FIG. 18). b)) or a third welded form in which both of these are combined (see FIG. 18 (c)) may be used, but the second and third welded forms are preferable.

Particularly preferred is the first sheet layer consisting of a part of the molten solidified product 20 m of the first sheet layer 20A and the second sheet layer 20B and the molten solidified product 30 m of all or most of the elastic sheet 30 at the sheet joint 40. It is a form in which 20A and the second sheet layer 20B are joined. In the third welded form shown in FIG. 20B, the elastic sheet 30 shown in white is shown between the melt-solidified 20 m of the fibers of the first sheet layer 20A or the second sheet layer 20B shown in black. In contrast to the melt-solidified 30 m of the above, in the first welded form shown in FIG. 20 (a), the elastic sheet 30 is formed between the melt-solidified 20 m of the fibers of the first sheet layer 20A or the second sheet layer 20B. No melted solidified material is found.

As in the first adhesive form and the third adhesive form, the first sheet layer 20A and the second sheet layer 20A and the second sheet layer 20A and the second sheet layer 20A and the second sheet layer 20A and the second sheet layer 20B use at least one of at least one of the 1st sheet layer 20A and the 2nd sheet layer 20B as an adhesive. When the sheet layer 20B is bonded, it is preferable that a part of the first sheet layer 20A and the second sheet layer 20B is not melted because the sheet bonding portion 40 is not hardened.

When the first sheet layer 20A and the second sheet layer 20B are non-woven fabrics, the core (the core of all the fibers of the sheet joint 40 is required so that a part of the first sheet layer 20A and the second sheet layer 20B does not melt. Not only the core of the composite fiber but also the central part of the single component fiber remains), but the peripheral part (including not only the sheath of the composite fiber but also the surface layer side part of the single component fiber) is in a melted form or a part. The fibers do not melt at all, but the remaining fibers are all melted or the core remains but the surrounding part is melted.

When the first sheet layer 20A and the second sheet layer 20B are joined using the molten solidified product 30 m of the elastic sheet 30 as an adhesive as in the second welded form and the third welded form, the peel strength becomes high. In the second welding form, the first sheet layer 20A is under the condition that the melting point of at least one of the first sheet layer 20A and the second sheet layer 20B is higher than the melting point of the elastic sheet 30 and the heating temperature at the time of forming the sheet joint 40. It can be manufactured by sandwiching the elastic sheet 30 between the second sheet layer 20B, pressurizing and heating the portion to be the sheet joint portion 40, and melting only the elastic sheet 30.

On the other hand, in the third welded form, between the first sheet layer 20A and the second sheet layer 20B under the condition that the melting point of at least one of the first sheet layer 20A and the second sheet layer 20B is higher than the melting point of the elastic sheet 30. It can be produced by sandwiching the elastic sheet 30 and pressurizing and heating the portion to be the sheet joint portion 40 to melt at least one of the first sheet layer 20A and the second sheet layer 20B and the elastic sheet 30.

From this point of view, the melting point of the elastic sheet 30 is preferably about 80 to 145 ° C., and the melting points of the first sheet layer 20A and the second sheet layer 20B are about 85 to 190 ° C., particularly about 150 to 190 ° C. The difference between the melting points of the first sheet layer 20A and the second sheet layer 20B and the melting points of the elastic sheet 30 is preferably about 60 to 90 ° C. The heating temperature is preferably about 100 to 150 ° C.

In the second welded form and the third welded form, when the first sheet layer 20A and the second sheet layer 20B are non-woven fabrics, the molten solidified product 30 m of the elastic sheet 30 is a sheet joint portion as shown in FIG. 19 (c). The first sheet layer 20A and the second sheet layer 20B in No. 40 may permeate between the fibers over the entire thickness direction, but as shown in FIG. 19A, they permeate between the fibers to the middle in the thickness direction, or As shown in FIG. 19B, the flexibility of the sheet joint 40 is higher in the form in which the fibers of the first sheet layer 20A and the second sheet layer 20B hardly permeate.

FIG. 23 shows an example of an ultrasonic sealing device suitable for forming the second welded form and the third welded form. In this ultrasonic sealing device, when forming the sheet joint 40, the first sheet layer 20A, between the anvil roll 60 having the protrusion 60a formed in the pattern of the sheet joint 40 on the outer surface and the ultrasonic horn 61, The elastic sheet 30 and the second sheet layer 20B are fed. At this time, for example, by making the feed transfer speed of the elastic sheet 30 on the upstream side by the feed drive roll 63 and the nip roll 62 slower than the transfer speed after the anvil roll 60 and the ultrasonic horn 61, the feed drive roll 63 and the nip roll 62 The elastic sheet 30 is extended to a predetermined elongation rate in the MD direction (machine direction, flow direction) by the path from the nip position by the anvil roll 60 to the seal position by the ultrasonic horn 61. The elongation rate of the elastic sheet 30 can be set by selecting the speed difference between the anvil roll 60 and the feed drive roll 63, and can be set to, for example, about 300% to 500%. 62 is a nip roll.

The first sheet layer 20A, the elastic sheet 30, and the second sheet layer 20B, which are fed between the anvil roll 60 and the ultrasonic horn 61, are laminated in this order, and the protrusion 60a and the ultrasonic horn 61 are combined. While pressurizing between, it is heated by the ultrasonic vibration energy of the ultrasonic horn 61 to melt only the elastic sheet 30, or at least one of the first sheet layer 20A and the second sheet layer 20B and the elastic sheet 30 are melted. By doing so, the joint hole 31 is formed in the elastic sheet 30, and at the same time, the first sheet layer 20A and the second sheet layer 20B are joined through the joint hole 31. Therefore, in this case, the area ratio of the sheet joint 40 is selected by selecting the size, shape, separation interval, arrangement pattern in the roll length direction and roll circumferential direction of the protrusion 60a of the anvil roll 60, and the like. Can be done.

The reason why the joint hole 31 is formed is not always clear, but it is considered that the portion of the elastic sheet 30 corresponding to the protrusion 60a of the anvil roll 60 melts and separates from the surroundings to open the hole. At this time, in the elastic sheet 30, the portion between the adjacent joint holes 31 lined up in the expansion / contraction direction ED is formed from the portions on both sides in the expansion / contraction direction by the joint holes 31 as shown in FIGS. 9A, 12 and 13. Since it will be cut and lose the support on both sides in the contraction direction, it contracts until the center side of the LD in the direction orthogonal to the expansion / contraction direction ED is balanced with the center side in the expansion / contraction direction within the range where continuity in the direction orthogonal to the contraction direction can be maintained. Then, the joint hole 31 expands in the expansion / contraction direction ED.

The constituent materials of the first sheet layer 20A and the second sheet layer 20B can be used without particular limitation, but are preferably breathable. Therefore, it is preferable to use a non-woven fabric from these viewpoints and from the viewpoint of flexibility. When a non-woven fabric is used, the texture is preferably about 10 to 25 g / m ² . Further, a part or all of the first sheet layer 20A and the second sheet layer 20B may be a pair of layers in which one material is folded back and opposed to each other. For example, as shown in the illustrated figure, in the waist end portion 23, the constituent material located on the outside is the second sheet layer 20B, and the folded portion 20C formed by folding back toward the inner surface side at the waist opening edge is used as the first sheet layer 20A. In addition to interposing the elastic sheet 30 between them, the constituent material located inside is the first sheet layer 20A and the constituent material located outside is the second sheet layer 20B, and the elastic sheet 30 is placed between them. Can be intervened. Of course, the constituent material of the first sheet layer 20A and the constituent material of the second sheet layer 20B are individually provided over the entire front-rear direction LD, and the constituent material of the first sheet layer 20A and the second sheet are not folded back. An elastic sheet 30 can also be interposed between the constituent members of the layer 20B.

The elastic sheet 30 is not particularly limited, and may be an elastic non-woven fabric as long as it is a sheet made of a thermoplastic resin having elasticity by itself. Further, as the elastic sheet 30, in addition to a non-perforated sheet, a sheet having a large number of holes and slits formed for ventilation can also be used. In particular, the tensile strength in the width direction WD (extension direction ED, MD direction) is 8 to 25 N / 35 mm, the tensile strength in the front-rear direction LD (direction XD, CD direction orthogonal to the expansion / contraction direction) is 5 to 20 N / 35 mm, and the width direction. It is preferable that the elastic sheet 30 has a tensile elongation of 450 to 1050% in the WD and a tensile elongation of 450 to 1400% in the front-rear LD. The thickness of the elastic sheet 30 is not particularly limited, but is preferably about 20 to 40 μm.

FIG. 24 shows an example of a method for manufacturing a pants-type disposable diaper. This production line has a lateral flow form in which the WD in the diaper width direction is in the MD direction (machine direction, line flow direction), and an exterior strip 200 (a portion to be the exterior 20) is formed here, and another line is formed. After the interior body 10 manufactured in the above is attached to the exterior strip 200, it is folded at the center in the CD direction to become both sides of the exterior 20 in the front body F and both sides of the exterior 20 in the back body B. Each part is welded and divided into individual diaper DPs. For the sake of clarity, some of the members that are continuous in the manufacturing process use the same names and codes as the members after manufacturing.

More specifically, this production line has an exterior body assembly process 301, an interior body mounting process 302, a leg opening punching process 303, a folding process 304, and a side seal portion forming / separating process 305. That is, in the exterior body assembly step 301, as shown in an enlarged manner in FIG. 23, the first sheet layer 20A and the second sheet layer 20B which are continuous in a strip shape with a predetermined width are bonded together along the continuous direction. The elastic sheet 30 that is supplied to the anvil roll 60 and the ultrasonic horn 61 of the ultrasonic sealing device and is continuous in a strip shape with a predetermined width has a feed speed slower than that of the anvil roll 60 and the ultrasonic horn 61 of the ultrasonic sealing device. The anvil roll 60 and the ultrasonic horn 61 of the ultrasonic sealing device are sandwiched between the first sheet layer 20A and the second sheet layer 20B in a state of being extended in the MD direction due to the speed difference between the drive roll 63 and the nip roll 62. Be supplied. In the illustrated embodiment, one sheet material is divided into two by the slitter 64 in order to supply the first sheet layer 20A separately in the front and rear, but the front and rear sheet materials may be supplied separately, and the first sheet layer may be supplied. Instead of separating the front and rear 20A, the front and rear integrated sheet material may be supplied as in the second sheet layer 20B. Similarly, in the illustrated embodiment, one elastic sheet 30 is divided into two by a slitter 64 in order to supply the elastic sheet 30 separately in the front and rear, but the elastic sheet 30 may be supplied separately in the front and rear, and the elasticity Instead of separating the front and rear sheets 30, the elastic sheet 30 integrated in the front and rear may be supplied.

In the ultrasonic sealing device, an anvil roll 60 having a large number of protrusions 60a arranged in a pattern of joints 40 in the above-mentioned stretchable region 80 and non-stretchable region 70 on the outer peripheral surface, and ultrasonic waves arranged opposite to the anvil roll 60. The first sheet layer 20A, the elastic sheet 30 extended in the MD direction, and the second sheet layer 20B are sandwiched between the horn 61 and heated by the ultrasonic vibration energy of the ultrasonic horn 61, and the protrusion 60a and the ultrasonic horn 61 are heated. The elastic sheet 30 is melted to form a through hole 31 only at a portion that is pressurized in the thickness direction with the outer peripheral surface of the first sheet layer 20A and the second sheet layer 20B at the position of the through hole 31. Is joined by welding to form a sheet joint portion 40. As a result, the exterior strip 200 is formed. The cross-sectional structure after forming the sheet joint 40 is also schematically shown in FIG. 26 (a). In the illustrated example, an ultrasonic sealing device is used, but other devices such as a heat sealing device can also be used.

After the ultrasonic sealing device, it is possible to form pants-type disposable diapers by basically adopting a known manufacturing process. In the illustrated embodiment, the interior body 10 manufactured on another line is supplied to the exterior body 20 formed through the ultrasonic sealing device at a predetermined interval in the MD direction in the interior body mounting step 302, and is hot. An interior assembly composed of the interior body 10 and the exterior body 20 is formed by joining to the exterior body 20 by an appropriate means such as a melt adhesive or a heat seal, and then in the leg opening punching step 303, the cutter device 67 is used. After the leg openings are formed in order, the interior assembly body including the interior body 10 and the exterior body 20 is folded in the center of the CD direction (horizontal direction orthogonal to the MD direction) in the folding step 304, and then the side seal portion forming step. In the separating step 305, the exterior body 20 of the front body F and the exterior body 20 of the rear body B are joined to form the side seal portion 21 at the portions on both sides of the individual diaper DP, and the boundary between the individual diapers. The exterior body 20 is cut at Q, and individual diaper DPs are obtained.

(Side seal part, side non-stretchable area)
Characteristically, in addition to FIGS. 1, 2, and 7, as shown enlarged in FIG. 25, the exterior body 20 has a side non-stretchable region 71 located at an end adjacent to the side seal portion 21. The stretchable region 80 is adjacent to the side seal portion 21 of the side non-stretchable region 71. Further, the exterior body 20 covers the stretchable region 80, the side non-stretchable region 71, and the side seal portion 21 (the illustrated example covers the entire width direction WD), the first sheet layer 20A and the second sheet layer 20B, and the stretchable region 80 and the side. It has an elastic sheet 30 interposed between the first sheet layer 20A and the second sheet layer 20B over the non-stretchable region 71 (in the illustrated example, from one side non-stretchable region 71 to the other side non-stretchable region 71). are doing. As shown in FIG. 26D, in the side non-stretchable region 71, the first sheet layer 20A and the second sheet layer 20B are not joined, and the elastic sheet 30 is the first sheet layer 20A and the second sheet layer 20A. It contracts to the expansion / contraction region 80 side without the sheet layer 20B, and the elastic sheet 30 and its melt are not contained in at least the portion (preferably the whole) other than the side edge portion of the side seal portion 21. There is. As a result, the adhesive force is not enhanced by melting and solidifying the elastic sheet 30 in the side seal portion 21, so that the side seal portion 21 is easily peeled off.

The dimension W1 in the width direction of the side non-stretchable region 71 can be appropriately determined, but when the width of the elastic sheet 30 located in the side non-stretchable region 71 is W3,
1.1 ・ W3 <W1 <3.0 ・ W3
In view of the above relationship, it is preferable that the elastic sheet 30 does not easily overlap the side seal portion 21, the side non-stretchable region 71 is not excessively wide, and the elasticity does not decrease significantly.

When the maximum elongation of the expansion / contraction region 80 is T and the dimension of the width direction WD of the side seal portion 21 is W2, W3 can be obtained by the following formula.
W3 = 100 ・ (W1 + W2) / T

Such a characteristic structure can be manufactured, for example, by changing the following process in the above-mentioned method for manufacturing a pants-type disposable diaper. That is, in the exterior body forming step, as shown in FIG. 26A, the sheet joint portion 40 is formed in the portion that becomes the stretchable region 80, and the sheet joint portion 40 is not formed in the portion that becomes the side non-stretchable region 71. As a result, the exterior strip-shaped body 200 in which the unit portion serving as the exterior body 20 of each disposable worn article repeats in the MD direction is formed. Then, between the exterior body assembly step shown in FIG. 26 (a) and the side seal portion forming step shown in FIG. 26 (c), is it one of the portions to be the side seal portion 21 as shown in FIG. 26 (b)? The elastic sheet 30 is divided in the MD direction at the cutting position CP (more preferably, the boundary Q of the individual diaper portion, the portion serving as the side edge of the side seal portion 21 in the product), and as shown by the arrow, The portion 30f located on the portion side of the elastic sheet 30 that becomes the side seal portion 21 with respect to the portion that becomes the expansion / contraction region 80 is contracted and pulled into the side non-expansion / contraction region 71. That is, by forming the sheet joint portion 40 of the stretchable region 80 in the state where the elastic sheet 30 is present up to the side seal portion 21 in this way, the first sheet layer 20A and the second sheet in the portion that becomes the stretchable region 80. The elastic sheet 30 can be securely fixed between the layers 20B. After the exterior body 20 assembly step and before the side seal portion forming step, the elastic sheet 30 is cut at a portion to be the side seal portion 21 and is located closer to the side seal portion 21 than the expansion / contraction region 80 of the elastic sheet 30. By contracting the portion 30f to be formed and pulling it into the side non-stretchable region 71, the elastic sheet 30 does not exist in the portion to be the side seal portion 21 in the side seal portion forming step as shown in FIG. 26 (c). Welding can be performed with. Therefore, according to the present manufacturing method, since the adhesive force is not enhanced by melting and solidifying the elastic sheet 30 in the side seal portion 21, the side seal portion 21 is easily peeled off in the manufactured pants-type disposable wear article. It becomes a thing. FIG. 26D shows a state in which the exterior body 20 is cut at the boundary Q of each diaper.

As a method for dividing the elastic sheet 30, for example, as shown in FIG. 24, a cutting roll 65 having a pressure protrusion 65a linearly continuous in the CD direction on the outer peripheral surface and ultrasonic waves arranged opposite to the cutting roll 65. A method of linearly cutting the elastic sheet 30 along the CD direction can be adopted by ultrasonically sealing (may be heat sealing) with the horn 66. In this case, the first sheet layer 20A and the second sheet layer 20B may be welded via the melt-solidified elastic sheet 30 at the division position CP, or are welded without passing through the melt-solidified product of the elastic sheet 30. May be good. That is, in the former case, the molten solidified product of the elastic sheet 30 may remain on the side edge portion of the side seal portion 21 during ultrasonic sealing, but the amount is very small, so that the side seal portion 21 is peeled off. It won't be difficult.

As another method for dividing the elastic sheet 30, the method described in Patent Document 4 can be adopted. Further, needle sticking is performed with a hole forming pattern similar to the method described in Patent Document 4, and perforations continuous in the CD direction are formed on the elastic sheet 30 without melting the elastic sheet 30, and the perforations are elastic. A method of breaking due to the tension applied by the stretching of the sheet 30 can also be adopted.

The split position CP of the elastic sheet 30 does not have to be a portion serving as a side seal portion, for example, as shown in FIGS. 27 and 28. For example, as shown in FIG. 27 (b), the elastic sheet 30 is divided in the MD direction at one portion of the side non-stretchable region 71 located on the downstream side of the formation position of the side seal portion 21 in the MD direction. The side located upstream of the MD direction of the formation position of the side seal portion 21 by contracting the portion 30f located between the split position CP in the elastic sheet 30 and the portion that becomes the expansion / contraction region 80 on the upstream side thereof. It can be pulled into the portion that becomes the non-stretchable region 71. The elastic sheet 30 shown in FIG. 27 can be divided between the exterior body 20 assembly and the side seal portion forming step, and in the side seal portion forming step, the welding pattern of the side seal portion 21 is downstream in the MD direction. It can be formed by adding a cutting pattern to the portion adjacent to the side. In the latter case, FIGS. 27 (b) and 27 (c) show a side seal portion forming step performed by a single welding device, and FIG. 27 (d) shows a separating step.

Further, as shown in FIG. 28B, for example, the elastic sheet 30 is divided at one place of the side non-stretchable region 71 located on the upstream side in the MD direction of the portion of the side seal portion 21. At the same time that 30 is divided in the MD direction, a sheet joint 40 is formed in a portion adjacent to the upstream side of the MD direction of the division position CP, and the split position in the elastic sheet 30 and the expansion / contraction region on the downstream side thereof. It is also possible to contract the portion located between the portion to be 80 and pull it into the portion to be the side non-stretchable region 71 located on the downstream side in the MD direction of the formation position of the side seal portion 21. FIG. 28 shows, in the exterior body forming step, when the sheet joint portion 40 is formed in the stretchable region following the non-stretchable region on the downstream side of the side seal portion, the forming pattern is downstream in the MD direction. The elastic sheet 30 is divided by adding a cutting pattern to a portion adjacent to the side. That is, FIGS. 28 (a) and 28 (b) show an exterior body assembly process performed by a single welding device, FIG. 28 (c) shows a side seal portion forming process, and FIG. 28 (d) shows a disconnection process. ing. However, the elastic sheet 30 can be divided at the division position CP shown in FIG. 28 between the exterior body 20 assembly and the side seal portion forming step.

<Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.

・ "Front body" and "rear body" mean the front and rear parts of the pants-type disposable diaper with the center in the front-back direction as the boundary, respectively. Further, the crotch portion means a front-rear direction range including the center in the front-rear direction of the pants-type disposable diaper, and when the absorber has a constricted portion, it means the front-rear direction range of the portion having the constricted portion.

-The "front-back direction" means the direction indicated by the symbol LD in the figure (vertical direction), and the "width direction" means the direction indicated by WD (horizontal direction) in the figure, and the front-back direction and the width direction. Are orthogonal.

-The "MD direction" and "CD direction" mean the flow direction (MD direction) in the manufacturing equipment and the lateral direction (CD direction) orthogonal to this, and one of them is the front-rear direction depending on the part of the product. And the other is in the width direction. The MD direction of the non-woven fabric is the direction of fiber orientation of the non-woven fabric. The fiber orientation is the direction along which the fibers of the non-woven fabric follow. For example, the measurement method according to the fiber orientation test method based on the zero-distance tensile strength of the TAPPI standard method T481 or the fibers based on the tensile strength ratio in the front-rear direction and the width direction. It can be discriminated by a simple measuring method for determining the orientation direction.

・ "Front side" means the one closer to the wearer's skin when worn, and "back side" means the one farther from the wearer's skin when worn.

・ "Front surface" means the surface of the member that is closer to the wearer's skin when worn, and "back surface" means the surface of the member that is farther from the wearer's skin when worn.

-"Maximum elongation" means the maximum value of elongation in the expansion / contraction direction ED (in other words, elongation in the expanded state in which the first sheet layer and the second sheet layer are expanded flat without shrinkage or slack), and is in the expanded state. The length is expressed as a percentage when the natural length is 100%.

The "area ratio" means the ratio of the target portion to the unit area, and the target portion (for example, the sheet joint portion 40, the opening of the joint hole 31, the ventilation hole) in the target region (for example, the stretchable region 80 and the non-stretchable region 70). ) Is divided by the area of the target area and expressed as a percentage. In particular, the “area ratio” in the region having a stretchable structure means the area ratio in the expanded state. In a form in which a large number of target portions are provided at intervals, it is desirable to set the target area to a size that includes 10 or more target portions and obtain the area ratio.

・ "Elongation rate" means the value when the natural length is 100%. For example, an elongation rate of 200% is synonymous with an elongation ratio of 2 times.

・ "Graining" is measured as follows. After pre-drying the sample or test piece, leave it in a test room or device under standard conditions (test location: temperature 23 ± 1 ° C., relative humidity 50 ± 2%) to bring it to a constant weight. Pre-drying refers to constant weight of a sample or test piece in an environment at a temperature of 100 ° C. It is not necessary to pre-dry the fibers having an official moisture content of 0.0%. A sample having a size of 100 mm × 100 mm is cut out from the test piece in a constant weight state using a sampling template (100 mm × 100 mm). The weight of the sample is measured and multiplied by 100 to calculate the weight per square meter, which is used as the index.

-The "thickness" of the absorber is the thickness measuring instrument of Ozaki Seisakusho Co., Ltd. (peacock, dial thickness gauge large type, model JB (measurement range 0 to 35 mm) or model K-4 (measurement range 0 to 50 mm)) Measure with the sample and the thickness measuring device horizontal.

-The "thickness" other than the above is automatically measured using an automatic thickness measuring device (KES-G5 handy compression measurement program) under the conditions of a load of 0.098 N / cm ² and a pressurized area of 2 cm ² .

-"Tensile strength" and "tensile elongation (breaking elongation)" are based on JIS K7127: 1999 "Plastic-Test method for tensile properties-" except that the test piece has a rectangular shape with a width of 35 mm and a length of 80 mm. It means a value measured with an initial chuck interval (distance between marked lines) of 50 mm and a tensile speed of 300 mm / min. As the tensile tester, for example, AUTOGRAPH AGS-G100N manufactured by SHIMADZU can be used.

"Elongation stress" is defined by a tensile test in which the initial chuck interval (distance between marked lines) is 50 mm and the tensile speed is 300 mm / min according to JIS K7127: 1999 "Plastic-Test method for tensile properties". , Means the tensile stress (N / 35 mm) measured when stretching in the elastic region, and the degree of stretching can be appropriately determined depending on the test object. The test piece is preferably rectangular with a width of 35 mm and a length of 80 mm or more, but if a test piece having a width of 35 mm cannot be cut out, a test piece is prepared with a width that can be cut out, and the measured value is measured with a width of 35 mm. The value converted to. Further, even when the target area is small and sufficient test pieces cannot be collected, at least comparison is possible as long as the test pieces of the same size are used even if the test pieces are appropriately small, as long as the magnitude of the elongation stress is compared. .. As the tensile tester, for example, AUTOGRAPH AGS-G100N manufactured by SHIMADZU can be used.

・ "Expanded state" means a state in which it is deployed flat without shrinkage or slack.

・ Unless otherwise specified, the dimensions of each part mean the dimensions in the unfolded state, not in the natural length state.

-If there is no description about the environmental conditions in the test or measurement, the test or measurement shall be performed in a test room or equipment under standard conditions (test location: temperature 23 ± 1 ° C, relative humidity 50 ± 2%). To do.

The present invention can be used for disposable diapers, sanitary napkins, disposable wear items for swimming and playing in the water, etc., as long as they are pants-type disposable wear items.

10 ... Interior body, 10B ... Inner / outer fixed area, 11 ... Top sheet, 12 ... Liquid permeable sheet, 13 ... Absorber, 13N ... Constricted part, 14 ... Packaging sheet, 17 ... Non-absorbent body side, 20 ... Exterior body , 20A ... 1st sheet layer, 20B ... 2nd sheet layer, 20C ... Folded part, 20X ... Elastic sheet elastic structure, 21 ... Side seal part, 23 ... Waist end, 24 ... Waist elastic member, 25 ... Shrink folds , 29 ... Leg circumference line, 30 ... Elastic sheet, 31 ... Joint hole, 33 ... Vent hole, 40 ... Sheet joint, 51, 52 ... Non-joint band, 51 ... First non-joint band, 51d ... First direction, 51s ... 1st interval, 51w ... 1st width, 52 ... 2nd non-joining band, 52d ... 2nd direction, 70 ... intermediate non-stretchable area, 71 ... side non-stretchable area, 80 ... stretchable area, 90 ... three-dimensional gather, 93 ... Folded part, 94 ... Free part, 95 ... Gathered sheet, 96 ... Gathered elastic member, 200 ... Exterior strip, B ... Back body, ED ... Telescopic direction, F ... Front body, L ... Middle part, LD ... Front and back Direction, T ... waist circumference, WD ... width direction.

Claims

An integrated exterior body extending from the front body to the back body, or an exterior body provided separately on the front body and the back body, and an interior body attached to the middle part in the width direction of the exterior body and covering both front and rear sides of the crotch part. A side seal portion in which both side portions of the exterior body on the front body and both side portions of the exterior body on the rear body are welded, a waist opening and a pair of left and right leg openings are provided.
The exterior body has a side non-stretchable region located at an end portion adjacent to the side seal portion, and a stretchable region adjacent to the side of the side non-stretchable region opposite to the side seal portion.
The exterior body extends over the stretchable region, the side non-stretchable region and the side seal portion, the first sheet layer and the second sheet layer, the stretchable region and the side non-stretchable region, and the first sheet layer and the said. It has an elastic sheet interposed between the second sheet layers,
The elastic region is a region that can be expanded and contracted in the width direction by elastic expansion and contraction of the elastic sheet.
In the stretchable region, the first sheet layer and the second sheet layer are joined through a joint hole penetrating the elastic sheet or through the elastic sheet at a large number of sheet joints arranged at intervals. And
In the side non-stretchable region, the first sheet layer and the second sheet layer are not joined, and the elastic sheet contracts toward the stretchable region side without the first sheet layer and the second sheet layer. And
The elastic sheet and its melt are not contained in at least a portion of the side seal portion other than the side edge portion.
Pants-type disposable wear items that are characterized by this.
The maximum elongation of the stretchable region is T, the widthwise dimension of the side non-stretchable region is W1, the widthwise dimension of the side seal portion is W2, and the width of the elastic sheet located in the side non-stretchable region is W3. When
1.1 ・ W3 <W1 <3.0 ・ W3
Satisfy the relationship,
The pants-type disposable wear article according to claim 1.
The method for manufacturing a pants-type disposable wear article according to claim 1.
A portion formed by sandwiching the elastic sheet continuous in the MD direction in a stretched state in the MD direction between the first sheet layer continuous in the MD direction and the second sheet layer continuous in the MD direction. By forming the sheet joint portion in the sheet and not forming the sheet joint portion in the portion to be the side non-stretchable region, the unit portion serving as the exterior body of each disposable worn article is repeated in the MD direction, and the exterior strip-like body is formed. The exterior assembly process and
The interior body mounting process of mounting the interior body to the exterior strip,
A side seal portion is formed by welding the portions of the front body on both sides of the exterior and the portions of the rear body on both sides of the exterior strip to which the interior is attached. Including the process
Between the exterior body assembly step and the side seal portion forming step, the elastic sheet is divided in the MD direction at one of the side seal portions or the side non-stretchable region, and the elastic sheet expands and contracts. The side portion located on the portion side of the side seal portion with respect to the region portion is contracted and pulled into the portion serving as the side non-stretchable region.
A method for manufacturing pants-type disposable wear items, which is characterized by the fact that.
The method for manufacturing a pants-type disposable wear article according to claim 1.
A portion formed by sandwiching the elastic sheet continuous in the MD direction in a stretched state in the MD direction between the first sheet layer continuous in the MD direction and the second sheet layer continuous in the MD direction. By forming the sheet joint portion and not forming the sheet joint portion in the portion to be the side non-stretchable region, an exterior strip-shaped body in which the unit portion serving as the exterior body of each disposable worn article repeats in the MD direction is formed. The exterior assembly process to be formed and
The interior body mounting process of mounting the interior body to the exterior strip,
A side seal portion is formed by welding the portions of the front body on both sides of the exterior and the portions of the rear body on both sides of the exterior strip to which the interior is attached. Including the process
In the side seal portion forming step, the elastic sheet is divided in the MD direction at one portion of the side non-stretchable region located on the downstream side in the MD direction of the formation position of the side seal portion, and the elastic sheet is described. The portion located between the split position and the stretchable region on the upstream side thereof is contracted and pulled into the portion that becomes the side non-stretchable region located on the upstream side in the MD direction of the formation position of the side seal portion. ,
A method for manufacturing pants-type disposable wear items, which is characterized by the fact that.
The method for manufacturing a pants-type disposable wear article according to claim 1.
A portion formed by sandwiching the elastic sheet continuous in the MD direction in a stretched state in the MD direction between the first sheet layer continuous in the MD direction and the second sheet layer continuous in the MD direction. By forming the sheet joint portion and not forming the sheet joint portion in the portion to be the side non-stretchable region, an exterior strip-shaped body in which the unit portion serving as the exterior body of each disposable worn article repeats in the MD direction is formed. The exterior assembly process to be formed and
The interior body mounting process of mounting the interior body to the exterior strip,
A side seal portion is formed by welding the portions of the front body on both sides of the exterior and the portions of the rear body on both sides of the exterior strip to which the interior is attached. Including the process
In the exterior body assembly step, the elastic sheet is divided in the MD direction at one part of the side non-stretchable region located on the upstream side in the MD direction of the portion to be the side seal portion, and at the same time, the division is performed. The sheet joint is formed in a portion adjacent to the upstream side of the position in the MD direction, and the portion located between the split position in the elastic sheet and the portion to be the expansion / contraction region on the downstream side thereof is contracted. , The side seal portion is pulled into the side non-stretchable region located on the downstream side in the MD direction.
A method for manufacturing pants-type disposable wear items, which is characterized by the fact that.