JP2023094943A - Method of producing elastic laminate - Google Patents

Abstract

To provide a technology that excels in transport stability of intermediate products and can stably produce elastic laminates.SOLUTION: A method of producing an elastic laminate according to the present invention includes: a splitting process for splitting a raw sheet 90 containing a continuous strip of elastic sheet 3A stretched in one direction into a first continuous sheet 91 and a second continuous sheet 92 by cutting the sheet 90 at a planned cutting line extending in a transport direction MD; a laminating process in which both sheets 91, 92 are overlapped so that the cut edges 91a, 92a at the planned cutting line are coincident with each other to obtain a continuous laminate 93; a provisional bonding process for forming a provisional bonding portion 95 by bonding both sheets 91, 92 together forming an outwardly protruded convex portion 94 in the transport orthogonal direction CD at the cut edge 93a of the continuous laminated body 93; a joining process for forming a joint 9 in the continuous laminate 93; and a sheet-making process for cutting the continuous laminate 93 in the transport orthogonal direction CD.SELECTED DRAWING: Figure 11

Description

TECHNICAL FIELD The present invention relates to a method for producing a stretchable laminate that forms a circumferentially stretchable annular structure and that can be used as a constituent member of various articles that require stretchability.

As a type of pants-type absorbent article, an absorbent pad section including an absorbent core that absorbs and retains bodily fluids, and an annular ring that is arranged around the wearer's waist and holds the absorbent pad section in contact with the crotch of the wearer. A separate type is known that includes a holder portion (waistband) and the absorbent pad portion is detachably attached to the holder portion. The holder part is typically an elastic laminate in which a plurality of sheets such as an elastic sheet having elasticity in the circumferential direction and a sheet for fixing the holder part (for example, a female member of a mechanical hook-and-loop fastener) are laminated. Main body.

In Patent Document 1, as a method for manufacturing a separate type pants-type disposable diaper, a continuous body of the front body and a continuous body of the back body of the holder part are conveyed in parallel with each other at a predetermined interval. After arranging the absorbent pad part so as to straddle both continuous bodies, the absorbent pad part is folded in half in a direction perpendicular to the conveying direction (perpendicular to the conveying direction), the two continuous bodies are overlapped, and the overlapped band shape is obtained. A method is described in which the body is cut to a predetermined length at a predetermined location in the conveying direction, and both ends formed by the cutting are joined to form the holder portion. Patent Literature 2 describes a method of forming the holder portion by folding a strip-shaped sheet member that is long in one direction.

Further, Patent Documents 2 and 3 describe techniques for improving the side seal portion of a general non-separate pants-type disposable diaper. In Patent Document 2, for the purpose of achieving both the appearance and feel of the side seal portions, the left and right side portions of the front body and the back body are bonded to each other in the main bonding region, and the left and right sides are bonded to each other from the main bonding region. A technique is described in which a sub-joint region having a weaker joint strength than the main joint region is formed on the outer side of the direction. Patent Document 3 describes that the bonding of the side seal portions is performed using ultrasonic waves for the purpose of improving the feel of the side seal portions, and that the entire area of the side seal portions is not formed with an adhesive. ing.

JP 2003-175066 A JP 2014-233466 A JP 2013-146549 A

A general non-separate pants-type disposable diaper includes an absorbent main body including a topsheet, a backsheet, and an absorbent body interposed between both sheets, and arranged on the non-skin facing side of the absorbent main body, The outer body is an elastic laminate in which the front body and the back body are integrated, and in the manufacturing process of the diaper, a plurality of the outer bodies are arranged in one direction in an unfolded state. While conveying the continuous body in the one direction, the absorbent main body is arranged on the continuous body of outer packaging, and then the continuous body of outer packaging is folded in half along with the absorbent main body in the direction perpendicular to the transportation direction, and the outer packaging is folded. It is common to overlap the front body side and the back body side of the body continuum. In this case, since the absorber having relatively high rigidity serves as a folding starting point, the continuous body continuous body is easily folded, and the crease formed is likely to be clear and neat. On the other hand, since the holder section, which is a stretchable laminate, does not include an absorbent body, it is formed into a stretchable continuous sheet in which the front body and the back body are integrated in the same manner as the outer body. If the continuous sheet is to be manufactured by folding in two, the continuous sheet does not have a folding starting point, so that it is difficult to fold.

Therefore, as a method for manufacturing a stretchable laminate that does not include an object that serves as a folding starting point such as the holder portion, a continuous sheet containing a stretchable sheet is folded in two in the direction perpendicular to the conveying direction to form a stretchable laminate. A method of dividing the continuous sheet into two in the direction orthogonal to the transport direction by cutting along a planned cutting line extending in the transport direction, and stacking the two divided continuous sheets produced by the two divisions to form a continuous laminate. can be considered. However, as a result of various studies by the inventors of the present invention on a manufacturing method including a step of dividing such a continuous sheet into two in the direction orthogonal to conveyance, the cut edge corresponding to the planned cutting line of the continuous laminate (the two sheets When the overlapping portion of the cut edge corresponding to the planned cutting line of each of the divided continuous sheets) includes a convex portion convex outward in the direction perpendicular to the conveyance in plan view, the next step of the continuous laminate It was found that problems such as the protrusions being turned over and the protrusions being wrinkled occurred during transportation to the. In this way, if the continuous laminate, which is an intermediate product, is not stably conveyed in the manufacturing process of the elastic laminate, and the edge portion along the conveying direction of the continuous laminate during conveyance is curled or wrinkled, the elastic laminate The appearance and functionality of the product may be degraded.

An object of the present invention is to provide a technique capable of stably producing an elastic laminate with excellent transport stability of an intermediate product.

The present invention comprises a first stretchable sheet having stretchability in one direction and a second stretchable sheet having stretchability in one direction and superimposed on one surface of the first stretchable sheet, and The elastic sheets are joined to each other at a pair of joints formed at both ends in the one direction, and the portions sandwiched between the pair of joints are not joined to each other. A method for producing an elastic laminate in which a portion sandwiched between two layers can form an annular structure having elasticity in the circumferential direction.
In one embodiment of the method for producing a stretchable laminate of the present invention, a raw sheet containing a continuous belt-like stretchable sheet that is continuous in one direction and stretched in the one direction is conveyed with the one direction as the conveying direction. While bisected in the transport orthogonal direction orthogonal to the transport direction and cut along a planned cutting line that meanders with respect to a central straight line extending parallel to the transport direction, the first elastic sheet is cut in the transport direction. and a dividing step of dividing into a first continuous sheet in which a plurality of the second stretchable sheets are arranged in a row, and a second continuous sheet in which a plurality of the second stretchable sheets are arranged in a row in the conveying direction.
In one embodiment of the method for producing a stretchable laminate of the present invention, the first continuous sheet and the second continuous sheet are overlapped so that the cut edges of both continuous sheets along the planned cutting line are aligned. and a lamination step of obtaining a continuous laminated body.
In one embodiment of the method for producing a stretchable laminate of the present invention, the two continuous sheets forming a convex portion outwardly in the conveying orthogonal direction at the cut edge of the continuous laminate are joined together. and a temporary bonding step of forming a temporary bonding portion.
One embodiment of the method for manufacturing a stretchable laminate of the present invention has a bonding step of intermittently forming the bonding portions in the continuous laminate in the conveying direction.
One embodiment of the method for producing a stretchable laminate of the present invention has a sheeting step of cutting the continuous laminate in the direction orthogonal to the transportation to obtain the stretchable laminate in sheets.
Other features, advantages and embodiments of the invention are described below.

According to the method for producing a stretchable laminate of the present invention, the intermediate product (continuous laminate) is excellent in transport stability, so a high-quality stretchable laminate can be stably produced.

FIG. 1 is a schematic plan view of one embodiment of an elastic laminate (a holder portion of an underpants-type disposable diaper) manufactured by the manufacturing method of the present invention. FIG. 2 is a cross-sectional view schematically showing the II line cross section of FIG. 1 (the cross section along the width direction and thickness direction of the elastic laminate shown in FIG. 1). FIG. 3 is a schematic perspective view of one embodiment of an underpants-type disposable diaper using the elastic laminate shown in FIG. FIG. 4 is a developed plan view schematically showing the skin-facing surface side of the diaper shown in FIG. FIG. 5 is a partially broken perspective view schematically showing an example of the stretch sheet (outer layer sheet) according to the present invention. 6 is a schematic perspective view of a manufacturing apparatus used for manufacturing the elastic laminate shown in FIG. 1. FIG. FIG. 7 is a cross-sectional view schematically showing the II-II line cross-section of FIG. 6 (the cross-section along the direction orthogonal to the transport direction and the thickness direction of the raw fabric sheet precursor). FIG. 8 is a cross-sectional view schematically showing a cross-section along the direction orthogonal to conveyance and the thickness direction of the raw sheet manufactured by the manufacturing apparatus shown in FIG. 6 . FIG. 9 is a schematic configuration diagram of a production line (second production section) for elastic laminates in the production apparatus shown in FIG. 6 . FIG. 10 is a diagram showing an outline of an example of a series of steps from dividing a raw sheet to obtaining a continuous laminate in the manufacturing method of the present invention, and FIG. 10(a) is a manufacturing apparatus shown in FIG. 10(b) is a schematic plan view of the two continuous sheets obtained by the splitting step, and FIG. 10(c) is the two FIG. 10D is a schematic plan view of a continuous laminate obtained by superimposing the two continuous sheets. FIG. be. FIG. 11(a) is a schematic plan view of the continuous laminate after the temporary bonding step in the manufacturing apparatus shown in FIG. 6, and FIG. FIG. 3 is a schematic plan view of a laminate; FIGS. 12(a) to 12(c) are diagrams each showing an outline of an example of the sheeting step in the manufacturing method of the present invention, and are schematic diagrams showing enlarged portions cut in the sheeting step. 2 is a schematic plan view; FIG. FIG. 13 is a plan view schematically showing an enlarged longitudinal end portion of the stretchable laminate shown in FIG. 1 .

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described based on its preferred embodiments with reference to the drawings. In addition, in the following description of the drawings, the same or similar reference numerals are given to the same or similar parts. The drawings are basically schematic, and the ratio of each dimension may differ from the actual one.

FIGS. 1 and 2 show an elastic laminate 1, which is an embodiment of the elastic laminate produced by the production method of the present invention. The stretchable laminate 1 is composed of a first stretchable sheet 1A having stretchability in one direction, specifically the longitudinal direction of the stretchable laminate 1 indicated by symbol Y in the figure, and one surface of the stretchable laminate 1A. and a second elastic sheet 1B having elasticity in the Y direction. Both sheets 1A and 1B are joined to each other at a pair of joining portions 9, 9 formed at both ends in the direction Y, and the portions sandwiched between the pair of joining portions 9, 9 are not joined to each other. First, the portion sandwiched between the pair of joints 9, 9 can form an annular structure having stretchability in the circumferential direction.

As shown in FIGS. 3 and 4, the elastic laminate 1 is used as a holder portion 17 that is a constituent member of an underpants-type disposable diaper 10, which is a type of underpants-type absorbent article. As shown in FIG. 4, the diaper 10 has a vertical direction (direction X) extending from the wearer's abdomen to the back through the crotch and a horizontal direction (direction Y) orthogonal to the vertical direction. , an absorbent pad portion 11 including an absorbent core 14 that absorbs and retains bodily fluids, and an annular holder portion 17 (elasticity Laminate 1).
The direction X is the width direction (lateral direction) of the elastic laminate 1 (sheets 1A, 1B) and also the longitudinal direction of the diaper 10, and the direction Y is the elastic laminate 1 (sheets 1A, 1B). , as well as the lateral direction of the diaper 10 .

The absorbent pad portion 11 is detachably attached to the holder portion 17 . That is, the absorbent pad portion 11 and the holder portion 17 are separate members before the diaper 1 is used. Both are joined by being attached to the target tape 7, and as shown in FIG. form. The joint portion 9 of the holder portion 17 corresponds to a side seal portion of a general non-separate pants-type disposable diaper. In this embodiment, the joint portion 9 has a straight shape extending along the direction X and extends over the entire length of the stretchable laminate 1 in the direction X. As shown in FIG.

As shown in FIGS. 3 and 4, the absorbent pad portion 11 includes a liquid-permeable surface sheet 12 arranged at a position relatively close to the wearer's skin, and a liquid-permeable topsheet 12 arranged at a position relatively far from the wearer's skin. a liquid-impermeable, liquid-impermeable or water-repellent backsheet 13 and an absorbent core 14 interposed between both sheets 12,13. These members constituting the absorbent pad portion 11 are integrated with each other by a known bonding means such as an adhesive. The absorbent pad portion 11 has a rectangular shape in plan view, and its longitudinal direction is aligned with the direction X when the diaper 10 is worn, as shown in FIG. A pair of anti-leakage cuffs 15, 15 are arranged on both sides of the absorbent pad portion 11 along the direction X so as to stand on the wearer's skin side when the diaper 10 is worn. Each leak-preventing cuff 15 includes a leak-preventing cuff-forming sheet 150 forming the main body of the leak-preventing cuff 15, and an elastic member 151 fixed to the sheet 150 in a stretched state in the direction X. As shown in FIG. Fastening tapes 16 (see FIG. 4) for connecting the absorbent pad 11 to the holder 17 are provided on the inner surfaces (surfaces facing the skin) of both ends of the absorbent pad 11 in the X direction.

The stretchable laminate 1 constituting the holder part 17 is mainly composed of a laminate of a first stretchable sheet 1A and a second stretchable sheet 1B. Both sheets 1A and 1B have the same shape and the same size in plan view as shown in FIG. The stretchable laminate 1 is formed symmetrically with respect to a horizontal center line (not shown) extending in the direction X by halving the stretchable laminate 1 in the direction Y. As shown in FIG.

The elastic laminate 1 (sheets 1A and 1B) has a pair of longitudinal ends X1 and X2 extending in the direction Y as shown in FIGS. The longitudinal end X1 is linear parallel to the direction Y in plan view, whereas the longitudinal end X2, which is the lower end when the holder part 17 is worn, is almost entirely aligned with the longitudinal end X1 in plan view. It forms a convex portion that protrudes toward (inwardly in the direction X).

The first elastic sheet 1A and the second elastic sheet 1B are, respectively, the exterior body 2 forming the outer surface (non-skin facing surface) of the elastic laminate 1 and the inner surface (skin facing surface) of the elastic laminate 1. ) side and a reinforcing sheet 5 forming the side.
In this specification, the term "skin-facing surface" refers to the surface of the absorbent article or its constituent members (absorbent pad portion, holder portion, etc.) that faces the wearer's skin when the absorbent article is worn. , "non-skin-facing surface" refers to the surface of an absorbent article or its constituent members that faces away from the skin when the absorbent article is worn.
In this embodiment, the exterior body 2 includes an outer layer sheet 3 forming the outer surface of the stretchable laminate 1 and an inner layer sheet 4 superimposed on the inner surface of the sheet 3, as shown in FIG. 3 and 4 are mainly used. The two sheets 3 and 4 are joined together and integrated by a joining means such as an adhesive or fusion.
As shown in FIG. 2, the exterior body 2 (sheets 3 and 4) is folded back on the inner surface side on the longitudinal end X1 side of the stretchable laminate 1, whereby the inner surfaces of the sheets 1A and 1B (facing the skin) are folded back. A folded portion 20 extending along the direction X from the longitudinal end X1 is formed on the surface). The folded portion 20 and the facing exterior body 2 are joined together by a joining means such as an adhesive or fusion. As shown in FIG. 2, the reinforcing sheet 5 is arranged at a position spaced apart from the folded portion 20 of the exterior body 2 by a predetermined distance in the direction X. As shown in FIG. The length of the reinforcement sheet 5 in the direction Y is the same as that of the exterior body 2 (sheets 3 and 4), but the length of the reinforcement sheet 5 in the direction X is shorter than that of the exterior body 2 (sheets 3 and 4). . A longitudinal end 5a of the reinforcing sheet 5 on the side of the folded portion 20 (upper end of the holder portion 17 when worn) has a straight shape parallel to the direction Y in plan view, and a longitudinal edge 5a on the side opposite to the side of the folded portion 20 of the reinforcing sheet 5. The direction end (lower end of the holder part 17 when worn) 5b constitutes the longitudinal end X2 of the stretchable laminate 1 together with the exterior body 2, and has a convex portion that protrudes toward the longitudinal end X1 in plan view. have.
As the outer layer sheet 3, the inner layer sheet 4, and the reinforcing sheet 5 that constitute the exterior body 2, nonwoven fabrics, resin films, and the like produced by various manufacturing methods can be used, respectively. Specific examples of nonwoven fabrics that can be used as the sheets 3, 4, 5 include spunbond nonwoven fabrics, air-through nonwoven fabrics, and needle-punched nonwoven fabrics, which may have a single-layer structure or a laminated structure in which one or more types of nonwoven fabrics are laminated. It's okay.

The outer layer sheet 3 is a stretchable sheet stretched in one direction, specifically the direction Y, which is the longitudinal direction of the stretchable laminate 1 or the lateral direction of the diaper 10, and has elasticity in the direction Y. The stretchable sheet is obtained by stretching an unstretched sheet such as a nonwoven fabric. The stretching process typically uses a processing means having a pair of tooth groove rolls provided on the peripheral surface so that tooth grooves that mesh with each other are provided along the rotation axis direction, and the rolls are rotated to It is carried out by supplying an unstretched sheet to the meshing portion. In the unstretched sheet by such a stretching process, a high basis weight portion having a relatively high basis weight and a low basis weight portion having a relatively low basis weight are alternately formed in the feeding direction (MD). The stretched sheet becomes a stretched sheet having elasticity in MD. The stretch sheet can be produced, for example, according to the method described in JP-A-2009-61743.

FIG. 5 shows a stretchable sheet 3A, which is a preferred example of the outer layer sheet 3. As shown in FIG. The elastic sheet 3A comprises two fiber sheets 31 and 32 facing each other and a plurality of elastic filaments 33 arranged between the fiber sheets 31 and 32 and extending in one direction (direction Y) without intersecting each other. have. A plurality of elastic filaments 33 are joined to the extensible fiber sheets 31, 32 over their entire longitudinal length in a substantially unstretched state.

Both of the fiber sheets 31 and 32 are stretchable in the direction in which the elastic filaments 33 extend (direction Y). The term "stretchable" as used herein includes (1) the case where the constituent fibers themselves of the fiber sheets 31 and 32 are elongated, and (2) the case where the constituent fibers themselves are not elongated but the fibers bonded at the intersection point are It includes the case where the fiber sheets 31 and 32 as a whole stretch due to separation, structural change of the three-dimensional structure formed by a plurality of fibers due to bonding between fibers, etc., or breakage of the constituent fibers. .

The fiber sheets 31 and 32 may each be a non-woven fabric of staple fibers. Nonwoven fabrics include air through nonwoven fabrics, heat roll nonwoven fabrics, spunlace nonwoven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, and the like. Both sheets 31 and 32 may be of the same type or of different types. The term "of the same type" as used herein means that the fiber sheets to be compared have the same manufacturing process, type of constituent fibers, fiber diameter and length of the constituent fibers, thickness and basis weight of the fiber sheets. means. If any one of these is different, the contrasting fibrous sheets are "dissimilar" to each other.

The elastic filament 33 is made of, for example, thermoplastic elastomer or rubber. In particular, when a thermoplastic elastomer is used as a raw material, it can be melt-spun using an extruder in the same way as a normal thermoplastic resin, and the elastic filaments thus obtained are easy to heat-seal. Suitable for sheet 3A. That is, a preferred example of the elastic filament 33 is an elastic filament formed by stretching a melted or softened elastic resin. The elastic filaments 33 and the fiber sheets 31 and 32 are preferably joined together by fusing the constituent fibers (non-elastic fibers) of both sheets 31 and 32 to the elastic filaments 33 while they are buried in the elastic filaments 33. It is made by using an adhesive such as a hot-melt type adhesive. Therefore, no adhesive exists between the fiber sheets 31, 32 and the elastic filaments 33 joined thereto.

The inner layer sheet 4 and the reinforcing sheet 5 may each be a stretchable sheet having stretchability in the direction Y, or a non-stretchable sheet having no stretchability. Both sheets 4 and 5 are typically non-stretchable sheets.

In this embodiment, the first elastic sheet 1A and the second elastic sheet 1B are sheets forming the inner surface (skin-facing surface) side of the elastic laminate 1, respectively, in addition to the reinforcing sheet 5. Includes sheet 6. In the present invention, the functional sheet 6 is for imparting various functions to the holder portion 17. In this embodiment, the functional sheet 6 is arranged so as to be in contact with the wearer's skin for the purpose of absorbing and retaining the sweat of the wearer. .
In this embodiment, as shown in FIG. 2, the functional sheet 6 is arranged so as to straddle the folded portion 20 of the exterior body 2 and the reinforcing sheet 5 in the direction X, and as shown in FIG. In a plan view, it has a shape (specifically, a rectangular shape) that is elongated in one direction, and its longitudinal direction is aligned with the direction Y, and it extends continuously over the entire length in the direction Y of each of the sheets 1A and 1B. The functional sheet 6 is shorter in the direction X than both sheets 1A and 1B.
The functional sheet 6 having a sweat absorbing function is not particularly limited as long as it is a sheet capable of absorbing sweat. Typically, nonwoven fabrics manufactured by various methods are used. Specific examples of nonwoven fabrics that can be used as the functional sheet 6 having a sweat-absorbing function include air-through nonwoven fabrics, spunbond nonwoven fabrics, spunlace nonwoven fabrics, air-laid nonwoven fabrics, meltblown nonwoven fabrics, and needle-punched nonwoven fabrics. A composite nonwoven fabric may be used.

In this embodiment, the first elastic sheet 1A and the second elastic sheet 1B each include a target tape 7 arranged on the outer surface (non-skin facing surface) of the outer layer sheet 3 . The target tape 7 is attached to the fastening tape 16 (see FIG. 4) provided in the absorbent pad portion 11, and the absorbent pad portion 11 is detachably attached to the holder portion 17 because the absorbent pad portion 11 is attached to the target tape 7. This is due to the fixing tape 16 provided in the portion 11 and the target tape 7 provided in the elastic laminate 1 as the holder portion 17 .
As shown in FIG. 1, the target tape 7 has a shape that is long in one direction (specifically, a rectangular shape) in a plan view, and the longitudinal direction of the target tape 7 is aligned with the direction Y, and the direction of each of the sheets 1A and 1B is aligned. It extends continuously over the entire length of Y. The target tape 7 is shorter in the X direction than the sheets 1A and 1B, and the center of the target tape 7 in the X direction is closer to the longitudinal end X2 than the centers of the sheets 1A and 1B in the X direction. They are arranged so that they are close to each other.

In the present invention, the configurations of the fixing tape 16 and the target tape 7 are not particularly limited, provided that the absorbent pad portion 11 can be attached to and detached from the holder portion 17 . For example, the fastening tape 16 may have an adhesive portion formed by applying an adhesive or the like to the tape base material, and the fastening tape 16 may be configured to adhere to the target tape 7 via the adhesive portion. good.
In this embodiment, mechanical hook-and-loop fasteners are used as the fixing tape 16 and the target tape 7 . The term "mechanical hook-and-loop fastener" as used herein refers to a fastener in which a surface member having hook-like projections arranged on one surface and a surface member having pile-shaped projections arranged on one surface are combined. A specific example of the mechanical hook-and-loop fastener is Velcro (registered trademark). The fastening tape 16 has a male member of a mechanical hook-and-loop fastener. Typically, a large number of projecting engaging members are arranged on the surface of a tape base material made of resin film, woven fabric, non-woven fabric, or the like. ing. The target tape 7 has a female member of a mechanical hook-and-loop fastener, and typically has a large number of loop members arranged on the surface of the base sheet.

In this embodiment, as shown in FIG. 2, a plurality of elastic members 8 are provided between the exterior body 2 (inner layer sheet 4) and the reinforcing sheet 5, and between the folded portion 20 and the exterior body 2 facing thereto. are arranged to be stretchable in the Y direction. The plurality of elastic members 8 extend over the entire length of both sheets 1A and 1B in the direction Y and are intermittently arranged in the direction X, as shown in FIG. Each elastic member 8 is fixed to the sheets 4, 5 in contact with the elastic member 8 by means of an adhesive. When the holder portion 17 is worn, contraction of the elastic member 8 forms a plurality of folds (gathers) extending in a direction intersecting the elastic member 8 (direction X) on the surfaces of the sheets 1A and 1B. The number and arrangement of the elastic members 8 are not particularly limited, and can be appropriately set in consideration of the fit of the holder part 17 to the wearer's body.

Next, the method for manufacturing the stretchable laminate of the present invention will be described with reference to the drawings, taking the method for manufacturing the stretchable laminate 1 (holder portion 17) described above as an example. FIG. 6 shows a manufacturing apparatus 70 used for carrying out the method for manufacturing the stretchable laminate 1. As shown in FIG. The manufacturing apparatus 70 includes a first manufacturing section 71 that performs a manufacturing process of a raw sheet 90, and a stretchable laminate 1 (holder section 17 ) is provided. In the second manufacturing section 72, the raw sheet 90 is cut along a planned cutting line CL (see FIG. 10A) extending in the conveying direction MD to divide into a first continuous sheet 91 and a second continuous sheet 92. (dividing step), a step of stacking both sheets 91 and 92 to obtain a continuous laminate 93 (lamination step), and a step of temporarily joining both sheets 91 and 92 in a predetermined portion of the continuous laminate 93 (temporary joining step), a step of forming the joint portion 9 in the continuous laminate 93 (joining step), and a step of cutting the continuous laminate 93 in the conveyance orthogonal direction CD to obtain a sheet elastic laminate 1 (sheet conversion step) is performed.

The method for manufacturing the stretchable laminate 1 of the present embodiment has, before the dividing step, a manufacturing step of the raw sheet 90 which is divided into two in the direction perpendicular to the transport direction CD in the dividing step. The manufacturing process of the original fabric sheet 90 will be described below.
The raw fabric sheet 90 is a continuous belt-shaped sheet including a continuous belt-shaped elastic sheet stretched in one direction. In the present embodiment, the elastic sheet is the continuous belt-shaped outer layer sheet 3, more A stretchable sheet 3A (see FIG. 5) is used.
The conveying direction MD coincides with the longitudinal direction (continuous direction) of the original fabric sheet 90 (elastic sheet 3A), and the perpendicular conveying direction CD orthogonal to the conveying direction MD is the width direction of the original fabric sheet 90 (elastic sheet 3A). (transverse direction).

In the first manufacturing section 71, as shown in FIG. 6, a continuous band-shaped inner layer sheet 4 (first raw material sheet) is placed on one side (upper surface in the illustrated embodiment) of the stretchable sheet 3A being conveyed in the conveying direction MD. While arranging so as to overlap with a planned cutting line CL (see FIG. 10(a)), which will be described later, on both sides of the planned cutting line CL on the other surface (lower surface in the illustrated embodiment) of the elastic sheet 3A in the conveyance orthogonal direction CD , a pair of continuous band-shaped target tapes 7, 7 (second raw material sheets) are arranged to obtain a continuous band-shaped raw fabric sheet precursor 80, and further, sheets 3A, 4, 3A, 4, 4, 7 Join together.
In this embodiment, the length (width) of the inner layer sheet 4 in the direction perpendicular to the transport direction CD is the same as that of the stretchable sheet 3A or longer than that of the stretchable sheet 3A. On the other hand, the length (width) of the target tape 7 in the transport orthogonal direction CD is shorter than that of the stretchable sheet 3A.
The sheets 3A, 4, and 7 forming the raw fabric sheet precursor 80 are joined together by joining means 73 provided in the first manufacturing section 71. As shown in FIG. As the joining means 73, a device conventionally used for joining sheets of this type can be used. In this embodiment, the joining means 73 includes a melting means 730 such as an ultrasonic horn for heating and melting the workpieces (sheets 3A, 4, 7) and a receiving roll 731. The melting means 730 and the receiving roll face each other. It is configured such that it can melt while pressurizing a workpiece supplied between the peripheral surface of 731 .

In the present embodiment, as shown in FIG. 6, after the sheets 3A, 4, and 7 constituting the original sheet precursor 80 are joined together by the joining means 73, the original sheet precursor being conveyed in the conveying direction MD A plurality of elastic members 8 are arranged and fixed in a stretched state at a predetermined stretch ratio on the surface of the elastic member 80 (the surface on the inner layer sheet 4 side in the illustrated embodiment). An adhesive such as a hot-melt adhesive is applied to the elastic member arrangement surface and/or the elastic member 8 by an adhesive coating machine (not shown) before the elastic member 8 is arranged, By arranging the elastic member 8 on the surface on which the elastic member is to be arranged, the elastic member 8 is joined and fixed to the raw fabric sheet precursor 80 .

In the present embodiment, as shown in FIG. 6, in the manufacturing process of the original fabric sheet 90, both side edges 80S, 80S of the original fabric sheet precursor 80 along the conveying direction MD are formed on one side of the original fabric sheet precursor 80. A pair of folded portions 20, 20 and a folded portion non-existing portion 21 positioned between the pair of folded portions 20, 20 are formed by folding back to the face side (the inner layer sheet 4 side in the illustrated embodiment) (folding process). As described above, the folded portion 20 forms one side edge of the stretchable laminate 1 in the longitudinal direction Y (horizontal direction Y of the holder portion 17). By being formed by folding such a sheet, the appearance of the stretchable laminate 1 is improved, and the appearance of the holder portion 17 (diaper 10) can be further improved.

In the folding step, any of the sheets 3A, 4, and 7 constituting the original sheet precursor 80 may be folded, but as shown in FIG. It is preferable to fold back (the target tape 7 is not folded back). The stretchable sheet 3A is more likely to meander during transportation than the other sheets that make up the raw sheet precursor 80, and if the stretchable sheet 3A meanders in the manufacturing process of the stretchable laminate 1, the stretchability of the manufactured product will be reduced. Although there is a risk that the appearance and functionality of the laminate 1 may be deteriorated, such inconveniences can be effectively prevented by folding back the elastic sheet 3A and the inner layer sheet 4 in the folding step.

In the present embodiment, in the manufacturing process of the raw fabric sheet 90, as shown in FIG. A belt-shaped reinforcing sheet 5 (third raw material sheet) is arranged so as to overlap the intended cutting line CL. As a result, the stiffness of the non-existing folded portion 21 of the original sheet 90 is increased, so that the first continuous sheet 91 and the second continuous sheet 92 obtained by cutting the original sheet 90 along the planned cutting line CL in the dividing step. The inconvenience that the cut edges 91a and 92a (see FIG. 10(b)) at the planned cutting line CL are turned over during the subsequent conveyance of the sheets 91 and 92 can be effectively prevented, and the manufacturing efficiency can be further improved. .

In the present embodiment, in the manufacturing process of the raw fabric sheet 90, as shown in FIGS. The functional sheet 6 (fourth raw material sheet) is arranged so as to overlap the boundary 22 between the pair of folded portions 20, 20 and the reinforcing sheet 5 (third raw material sheet). As a result, a continuous belt-like raw sheet 90 is obtained in which the elastic sheet 3A and the sheets 4 to 7, which are the first to fourth raw sheets, are laminated. A boundary 22 between the folded portion 20 and the reinforcing sheet 5 is a gap between the folded portion 20 and the reinforcing sheet 5, as shown in FIG. part. Further, as described above, in the present embodiment, the joint 9 (see FIG. 1) extends over the entire length of the elastic laminate 1 in the direction X, and overlaps the boundary 22. If the sheets exist so as to straddle portions where the number of laminated sheets is different, there is a concern that the bonding strength of the bonding portion 9 may vary. However, by arranging the reinforcing sheet 5 over the boundary 22 where the number of laminated sheets is relatively small as described above, such concern is eliminated, and the joint strength of the joint 9 becomes constant over the entire length in the longitudinal direction. obtain.

The continuous band-shaped original fabric sheet 90 manufactured in the first manufacturing section 71 as described above is then conveyed to the second manufacturing section 72 and used to manufacture the elastic laminate 1 . FIG. 9 shows a schematic configuration of the second manufacturing section 72, and FIG. 10 shows the states of the workpieces such as the original sheet 90 in each section of the second manufacturing section 72. As shown in FIG.

In the second manufacturing section 72, the original fabric sheet 90 is first conveyed in the conveying direction MD, and cut along the intended cutting line CL (see FIG. 10A) extending in the conveying direction MD to form a first continuous sheet. The sheet 91 and the second continuous sheet 92 are divided (dividing step).
The dividing step is performed by a cutting means 74 provided in the second manufacturing section 72 . As the cutting means 74, a device conventionally used for cutting this type of sheet can be used. In this embodiment, the cutting means 74 comprises a cutter roll 740 having a blade for cutting the sheet and a receiving roll 741 .

As shown in FIG. 10A, the planned cutting line CL meanders with reference to a central straight line 90L that bisects the raw sheet 90 in the conveyance orthogonal direction CD and extends parallel to the conveyance direction MD. In the illustrated embodiment, the planned cutting line CL meanders symmetrically with respect to the central straight line 90L, and therefore the first continuous sheet 91 and the second continuous sheet 92 are in a symmetrical relationship with respect to the planned cutting line CL. Note that the planned cutting line CL is typically a virtual line and is not provided on the raw fabric sheet 90 so as to be visually recognizable, but may be provided so as to be visually recognizable.
In the present embodiment, the planned cutting line CL has a convex portion that protrudes on one side in the direction orthogonal to the transport direction CD and a protruding portion that protrudes on the other side in the transport direction MD alternately in a plan view as shown in FIG. It has a shape aligned with The planar view shape of the planned cutting line CL is not particularly limited as long as the planned cutting line CL meanders with respect to the central straight line 90L, and as shown in FIG. You don't have to. The plan view shape of the intended cutting line CL may be, for example, a shape in which the contour line is composed only of straight lines, for example, the convex portion forms a trapezoidal shape in a plan view, or a shape in which the contour line is S-shaped. may be a shape consisting of only curved lines, or may be a shape in which straight lines and curved lines are mixed.

The first continuous sheet 91 has a structure in which a plurality of the first elastic sheets 1A are continuous in one direction (conveyance direction MD), and the second continuous sheet 92 is the second elastic sheet 1B in one direction (conveyance direction). It has a configuration in which a plurality of them are continuous in the direction MD). The first continuous sheet 91 has a non-linear cut edge 91a and a linear edge 91b, which are formed by cutting the raw fabric sheet 90 along the intended cutting line CL, as a pair of edges extending in the transport direction MD. have. The second continuous sheet 92 has a pair of edges extending in the transport direction MD, a non-linear cut edge 92a produced by cutting the original fabric sheet 90 along the planned cutting line CL, and a linear edge 92b. have. The non-linear cut edges 91a and 92a form the longitudinal end X2 of the elastic laminate 1 (the lower end when the holder part 17 is worn), and the linear edges 91b and 92b form the elastic laminate. 1 (the upper end when the holder part 17 is worn) is formed (see FIG. 1, etc.).

As shown in FIG. 9, the second manufacturing section 72 includes a transport path 910 for the first continuous sheet 91 and a transport path 920 for the second continuous sheet 92. The transport paths 910 and 920 are independent of each other over a predetermined distance. are doing.

After the dividing step, the first continuous sheet 91 and the second continuous sheet 92 are overlapped so that the cut edges 91a and 92a of the two continuous sheets 91 and 92 along the intended cutting line CL are aligned to form a continuous laminate. 93 is obtained (lamination step).
In the present embodiment, in the stacking step, first, while conveying the first continuous sheet 91 and the second continuous sheet 92 along the conveying paths 910 and 920 in the conveying direction MD, the sheets 91 and 92 are cut along the planned cutting line CL. One or both of the sheets 91 and 92 are rotated around the conveying direction MD so that the cut edges 91a and 92a of the sheets face the same direction (rotating step). After the rotation process or during the rotation process, the first continuous sheet 91 and the second continuous sheet 92 are separated from each other by cutting edges 91a of both sheets 91 and 92 as shown in FIG. 10(c). , 92a are aligned with each other in the transport direction MD, and superimposed as shown in FIG. The continuous laminate 93 has a pair of edges 93a and 93b extending in the transport direction MD (longitudinal direction), and one non-linear cut edge 93a is a non-linear cut edge of both sheets 91 and 92. The non-linear longitudinal direction X2 of the stretchable laminate 1 is formed by overlapping portions of the portions 91a and 92a. 92b overlapping portions, forming the linear longitudinal direction X1 of the stretchable laminate 1. As shown in FIG.

In this embodiment, as shown in FIG. 6, one side of the transport orthogonal direction CD is the operating side (hereinafter also referred to as "OP side") of the manufacturing apparatus 70 used for carrying out the method for manufacturing the stretchable laminate 1. ), and the other side of the transport orthogonal direction CD is the drive side (hereinafter also referred to as “DR side”) of the manufacturing apparatus 70 , the first continuous sheet 91 is on the OP side, and the second continuous sheet 92 is on the DR side. positioned. The OP side is the side where the operator who operates the manufacturing apparatus 70 is located, and the DR side is the side where most of the drive equipment for operating each part of the manufacturing apparatus 70 exists.
In the rotating step, as described above, one or both of the sheets 91 and 92 are rotated in the conveying direction so that the cut edge 91a of the first continuous sheet 91 and the cut edge 92a of the second continuous sheet 92 face the same direction. The direction in which the cut edges 91a and 92a face after the rotation process may be the OP side or the DR side, but the DR side is preferable as shown in FIG. 10(b). The reason for this is that the rotation and movement of both the seats 91 and 92 can be performed smoothly and accurately. That is, in the rotating step and the lamination step of the next step, positional information thereof is typically obtained using a detection means (not shown) such as a sensor installed on the OP side, and the positional information is used. The straight edge portions 91b and 92b are more easily detected by the detection means than the non-linear cut edge portions 91a and 92a. It is preferable that the linear edges 91b and 92b always face the OP side during the rotation step and the stacking step because positional information is accurate and easy to handle. It is preferable that the cut edges 91a, 92a always face the DR side. Therefore, in the rotating step, it is preferable that the cut edges 91a and 92a of the sheets 91 and 92 both face the DR side.

In the present embodiment, in order to direct the cut edges 91a and 92a of both sheets 91 and 92 to the DR side in the rotating process, the cut edges 92a are directed to the OP side immediately after the dividing process is performed. The continuous sheet 92 is rotated 180 degrees around the transport direction MD. On the other hand, the first continuous sheet 91 is not rotated in the conveying direction MD because the cut edge 91a faces the DR side immediately after the dividing step.
As shown in FIG. 9, the conveying path 920 of the second continuous sheet 92 is provided with a sheet rotation area 75 for rotating the second continuous sheet 92 being conveyed by 180 degrees around the conveying direction MD. In 75, a plurality of cylindrical transport rolls 750 as sheet rotating means are intermittently arranged in the transport direction MD with their axial directions aligned with the orthogonal transport direction CD. The plurality of transport rolls 750 in the sheet rotation area 75 have different angles between their axial directions and the horizontal direction (vertical direction), and are arranged from the upstream side to the downstream side in the transport direction MD (from the left side to the right side in FIG. 9). ) so that the angle increases or decreases. The second continuous sheet 92 is conveyed in the conveying direction MD through the sheet rotation area 75 configured in this way, and is rotated 180 degrees around the conveying direction MD.
The number of transport rolls 750 arranged in the sheet rotation area 75 is not particularly limited, and can be appropriately adjusted according to the sheet rotation angle and the like. again. The sheet rotating means is also not particularly limited, and a known rotating means capable of rotating the sheet being transported around the transport direction can be used as appropriate.

Each of the cut edge portions 91a and 92a has a wavy line shape in which convex portions and concave portions are alternately arranged in the conveying direction MD in plan view as shown in FIG. When the distance between the apexes of the convex portions in the conveying direction MD is set to 1 pitch, immediately after the dividing step (before the phases of the cut edges 91a and 92a are aligned in the conveying direction MD), the cut edge 91a and the cutting edge 92a are shifted by 0.5 pitches in the transport direction MD (see FIGS. 10A and 10B). In the stacking step, the sheets 91 and 92 are overlapped to form a continuous stack 93 in which the contours of the sheets 91 and 92 match each other while eliminating the phase shift in the transport direction MD between the cut edges 91a and 92a. Form.

The method of phase matching is not particularly limited, and various methods can be employed without departing from the scope of the present invention. In the present embodiment, as shown in FIG. 9, the conveying path 910 for the first continuous sheet 91 and the conveying path 920 for the second continuous sheet 92 are made different in length for the phase matching. More specifically, the conveying path 910 of the first continuous sheet 91, which is not rotated in the conveying direction MD in the rotating step, is set longer than the conveying path 920 of the second continuous sheet 92. The phases of the cut edges 91a and 92a of the sheets 91 and 92 in the conveying direction MD are made to match at the joining position of the sheets 910 and 920 (the position where the continuous laminated body 93 is formed).

In the second manufacturing section 72, after forming the continuous laminated body 93 as described above, as shown in FIG. Both sheets 91 and 92 that form a convex portion 94 that protrudes outward in the conveyance orthogonal direction CD at the overlapping portion of the cut edge portions 91a and 92a) are joined together to form a temporary joint portion 95 ( temporary bonding process).

If, without forming the temporary joint portion 95, the joint portion 9 (see FIG. 1) is formed in the continuous laminate 93 by the joining means 77 (see FIG. 9) provided in the second manufacturing section 72 in the next step, While the continuous laminated body 93 is being conveyed to the joining means 77, problems may occur such as the sheets forming the convex portion 94 (sheets 3A, 4 and 5 in this embodiment) being turned over and the convex portion 94 being wrinkled. . The projections 94 protrude outward in the direction perpendicular to the transport direction CD compared to the peripheral portion, and include a stretchable sheet 3A having stretchability in the transport direction MD. ) is not provided and the rigidity is relatively low, the continuous laminated body 93 is easily affected by wind pressure, vibration, etc. caused by conveyance of the continuous laminated body 93, and it is difficult to stabilize the posture. If the convex portion 94 is turned up or wrinkled while the continuous laminated body 93 is being conveyed to the joining means 77, the joining portion 9 is formed by the joining means 77 on the convex portion 94 that is turned up or wrinkled. There is a possibility that the appearance of the joint portion 9 and the deterioration of joint strength may be caused. The temporary bonding process can improve the transport stability of the continuous laminate 93 as an intermediate product, and effectively prevent such inconveniences from occurring.

The temporary joint portion 95 is formed on the convex portion 94 of the continuous laminate 93 . The term “convex portion 94” as used herein refers to a pair of concave portions located on both sides of the continuous laminated body 93 in the longitudinal direction (the direction parallel to the transport direction MD) of the continuous laminated body 93 with one convex portion 94 interposed therebetween. (the cut edge 93a of the shortest portion in the continuous laminate 93 in the direction perpendicular to the conveying direction CD).
The shape, size, arrangement position, number of arrangement, etc. of the temporary joint 95 are not particularly limited as long as they are formed at least on the convex portion 94 . From the viewpoint of more reliably achieving the effect of improving the transportation stability of the body 93, in the temporary bonding step, the continuous laminated body 93 is most likely to be turned over or wrinkled during transportation. It is preferable to form a temporary joint portion 95 at the top portion of 94 (the cut edge portion 93a of the longest portion of the continuous laminate 93 in the direction perpendicular to the transport direction CD).
In this embodiment, as shown in FIG. 11(a), one temporary joint portion 95 is formed at the top of each of the plurality of convex portions 94 of the continuous laminated body 93, and is transported from the cut edge portion 93a in plan view. It has a belt-like shape extending in the orthogonal direction CD and is formed only on the convex portion 94 and is not formed on the target tape 7 (second raw material sheet). In the present invention, the temporary joint portion 95 may extend from the convex portion 94 toward the target tape 7 , and a plurality of temporary joint portions 95 may be formed for each convex portion 94 . The length of the continuous laminated body 93 of the temporary bonding portion 95 in the longitudinal direction (direction parallel to the transport direction MD) is preferably 0.1 mm or more, more preferably 1 mm or more, and preferably 20 mm or less, more preferably 10 mm. It is below.

In the present embodiment, in the temporary joining step, in the vicinity of a planned cutting position (for example, an imaginary straight line extending in the conveyance orthogonal direction CD through the top of the convex portion 94) in the sheeting step described later in the continuous laminated body 93 In addition, between the planned formation positions of the pair of joints 9, 9 located on both sides in the conveyance direction MD across the planned cutting position, the distance between the planned formation of the pair of joints 9, 9 in the conveyance orthogonal direction CD A short temporary joint 95 is formed (see FIG. 11(b)).

The temporary bonding step is performed by a bonding means 76 (see FIG. 9) provided in the second manufacturing section 72 . The temporary joint portion 95 is typically formed by fusing the forming material of the portion to be formed of the temporary joint portion 95 by ultrasonic waves or heating. In this embodiment, in order to carry out the method of forming such a temporary joint 95, the joining means 76 includes a melting means 760 for melting the workpiece (continuous laminate 93) by ultrasonic waves or heating, and a receiving roll 761. , and is configured to pressurize and melt the workpiece supplied between the melting means 760 and the peripheral surface of the receiving roll 761 facing each other.

After the temporary joining step, as shown in FIG. 11B, joints 9 (see FIG. 1) are intermittently formed in the conveying direction MD in the continuous laminate 93 on which the temporary joints 95 are formed (joining process).
In this embodiment, a pair of joints 9 , 9 are formed at both ends in the longitudinal direction (conveyance direction MD) of one unit of the elastic laminate 1 in the continuous laminate 93 . More specifically, in the bonding step of the present embodiment, in the vicinity of the temporary bonding portion 95 (the top of the convex portion 94) (preferably within 20 mm, more preferably within 10 mm from the temporary bonding portion 95) and the temporary bonding On both sides of the portion 95 in the direction parallel to the conveying direction MD (longitudinal direction of the continuous laminate 93), a pair of joints 9 having a longer length in the perpendicular conveying direction CD than the temporary joints 95 is formed. In the illustrated form, the plurality of joints 9 extend over the entire length of the continuous laminate 93 in the direction perpendicular to conveyance CD, respectively, along the direction perpendicular to conveyance CD.
In the continuous laminate 93 that has undergone the joining step, a region where the interval between the two joining portions 9, 9 adjacent to each other in the conveying direction MD is relatively long and a region where the interval is relatively short are formed in the conveying direction MD. Where they are alternately arranged, the former is a region sandwiched between a pair of joints 9, 9 in one unit of the elastic laminate 1, and the latter is the joint 9 of one unit of the elastic laminate 1. It is a region sandwiched between the joint portion 9 of another unit of the elastic laminate 1 adjacent thereto.

The joining step is performed by joining means 77 (see FIG. 9) provided in the second manufacturing section 72 . The joint portion 9 is typically formed by fusing the forming material of the portion to be formed of the joint portion 9 by ultrasonic wave or heat. In this embodiment, in order to carry out the method of forming the joint 9, the joining means 77 includes a melting means 770 for melting the workpiece (continuous laminate 93) by ultrasonic waves or heating, and a receiving roll 771. , and is configured to pressurize and melt the workpiece supplied between the melting means 770 and the peripheral surface of the receiving roll 771 facing each other.

When the temporary joint portion 95 and the joint portion 9 are formed by fusing the forming material of the formation planned portion by ultrasonic wave or heating, the formation conditions (fusion temperature, pressure applied to the formation planned portion, etc.) The portion 95 and the joint portion 9 may be the same or different. The former is typically the case, and the bonding strength is substantially the same between the temporary bonding portion 95 and the bonding portion 9.

From the viewpoint of more reliably preventing the inconvenience of forming the joint portion 9 in a state where the convex portion 94 of the continuous laminate 93 is turned up or wrinkled, the temporary joint portion is formed after the temporary joint step and before the joint step. It is preferable to extend 95 outward in the orthogonal transport direction CD.
The second manufacturing section 72 is provided with sheet tensioning means 78 (FIG. 9) for carrying out the process of extending the projections 94 as described above. As the sheet pulling means 78, known means capable of pulling the continuous belt-shaped sheet being conveyed in the direction perpendicular to the conveying direction can be used without particular limitation.

After the joining step, the continuous laminate 93 in which the temporary joints 95 and the joints 9 are formed is cut in the conveyance orthogonal direction CD while being conveyed in the conveyance direction MD to obtain the sheet-fed elastic laminate 1 ( sheeting process).
In the present embodiment, as described above, in the bonding step, a pair of bonding portions 9 are formed on both sides of the temporary bonding portion 95 in the vicinity of the temporary bonding portion 95 in the direction parallel to the transport direction MD. In the sheet forming step, the continuous laminated body 93 is cut in the conveyance orthogonal direction CD between one joint portion 9 and the other joint portion 9 forming a pair of the joint portions 9 . In this case, as shown in FIG. 12(a), the continuous laminated body 93 may be cut at the position of the temporary joint 95, or as shown in FIG. 12(b) or 12(c), the temporary joint The continuous laminated body 93 may be cut between the portion 95 and one joint portion 9 forming a pair of the joint portions 9 .

FIG. 13 shows an enlarged view of one end in the direction Y of the stretchable laminate 1 shown in FIG. In addition to the pair of joint portions 9, 9, the sheet elastic laminate 1 manufactured through the temporary joining step further includes a pair of joint portions 9, 9 located outside the pair of joint portions 9, 9 in the direction Y. of temporary joints 95, 95. The temporary joint portion 95 is shorter in the direction X than the joint portion 9 . The form shown in FIG. 13 is obtained by cutting the continuous laminate 93 at the position of the temporary joint 95 as shown in FIG. Temporary joints 95 are formed at both ends in the Y direction.
In this embodiment, the temporary joint portion 95 and the joint portion 9 are configured by intermittently arranging a plurality of concave portions 95S and 9S in one direction (direction X). The shape of the concave portions 95S, 9S in a plan view is not particularly limited, and may be, for example, a circular shape, an elliptical shape, or the like, in addition to the rectangular shape shown in the drawing. Further, the temporary joint portion 95 and the joint portion 9 may be a continuous line-shaped recessed portion instead of such an assembly of a plurality of recessed portions, and the continuous line-shaped recessed portion extends over the entire length in the longitudinal direction. The depth may be constant, or a plurality of types of recesses having different depths may be included.

The present invention is not limited to the above embodiments, and can be modified as appropriate without departing from the scope of the present invention.
For example, in the above-described embodiment, the original fabric sheet 90 includes a sheet other than the stretch sheet 3A, but it may be composed only of the stretch sheet 3A.
Further, in the embodiment, in the rotating step, only one of the first continuous sheet 91 and the second continuous sheet 92 (specifically, the sheet 92) is rotated 180 degrees around the conveying direction MD. Both the sheets 91 and 92 may be rotated. For example, by rotating the sheets 91 and 92 by 90 degrees around the transport direction MD, the directions of the cut edges 91a and 92a of the sheets 91 and 92 are aligned. may

The following notes are further disclosed with respect to the above-described embodiments of the present invention.
<1>
A first stretchable sheet having stretchability in one direction and a second stretchable sheet having stretchability in one direction and superimposed on one surface of the first stretchable sheet, both stretchable sheets , are joined to each other at a pair of joint portions formed at both ends in the one direction, and are not joined to each other at a portion sandwiched between the pair of joint portions, and are sandwiched between the pair of joint portions. A method for producing an elastic laminate in which a portion can form an annular structure having elasticity in the circumferential direction,
A raw sheet containing a continuous band-shaped elastic sheet that is continuous in one direction and stretched in the one direction is conveyed in the one direction as the conveying direction, and is divided into two equal parts in the conveying orthogonal direction perpendicular to the conveying direction. A first continuous sheet cut along a planned cutting line that meanders with respect to a central straight line extending parallel to the conveying direction, and in which a plurality of the first stretchable sheets are continuous in the conveying direction; and the second stretchable sheet. a dividing step of dividing into a plurality of second continuous sheets continuous in the conveying direction;
A stacking step of obtaining a continuous laminate by stacking the first continuous sheet and the second continuous sheet so that the cut edges of both continuous sheets on the planned cutting line are aligned;
a temporary joining step of forming a temporary joining portion by joining the two continuous sheets forming a convex portion that protrudes outward in the conveying orthogonal direction at the cut edge portion of the continuous laminate;
A joining step of intermittently forming the joining portion in the continuous laminate in the conveying direction;
A method for producing a stretchable laminate, comprising a step of cutting the continuous laminate in the direction orthogonal to the conveying direction to obtain a sheet of the stretchable laminate.
<2>
The method for manufacturing an elastic laminate according to <1>, wherein in the temporary bonding step, the temporary bonding portion is formed on the top portion of the convex portion.
<3>
In the temporary joining step, in the vicinity of the planned cutting position in the single-wafer forming step in the continuous laminate, and at the planned formation positions of the pair of joint portions located on both sides in the conveying direction across the planned cutting position. The method for producing an elastic laminate according to <1> or <2> above, wherein the temporary joint portion having a shorter length in the direction perpendicular to conveyance is formed between the pair of joint portions to be formed.
<4>
The elastic laminate according to any one of <1> to <3>, wherein the temporary bonding portion is stretched outward in the direction orthogonal to the transport after the temporary bonding step and before the bonding step. manufacturing method.
<5>
In the single-wafer forming step, the continuous laminated body is cut in the transport orthogonal direction between one joint portion and the other joint portion constituting the pair of the joint portions, according to <1> to <4>. A method for producing an elastic laminate according to any one of items 1 to 3.
<6>
The method for producing an elastic laminate according to any one of <1> to <5>, wherein the temporary joints and the joints are formed by fusing the materials forming the relevant portions with ultrasonic waves or heating. .

<7>
Prior to the dividing step, having a manufacturing step of the raw fabric sheet,
In the raw sheet manufacturing process, a continuous belt-like first raw material sheet is arranged on one surface of the stretchable sheet being conveyed in the one direction so as to overlap the planned cutting line, and the other side of the stretchable sheet is arranged. A pair of continuous strip-shaped second raw material sheets are arranged on both sides of the plane of the plane in the direction perpendicular to the conveyance to obtain a raw fabric sheet precursor, and further constitute the raw fabric sheet precursor. The method for producing an elastic laminate according to any one of <1> to <6> above, wherein the sheets are joined together.
<8>
In the raw fabric sheet manufacturing process, both side edge portions of the raw fabric sheet precursor along the conveying direction are folded back to one surface side of the raw fabric sheet precursor to form a pair of folded portions and the pair of folded portions. The method for producing an elastic laminate according to <7> above, wherein a folded portion non-existing portion positioned between the portions is formed.
<9>
In the production process of the original sheet, a continuous belt-shaped third raw material sheet is arranged on the non-existent part of the folded portion of the surface of the original sheet precursor on the first raw material sheet side so as to overlap the planned cutting line. The method for producing an elastic laminate according to <8>.

1 Elastic laminate 1A First elastic sheet 1B Second elastic sheet 2 Outer body 20 Folded part 21 Folded part absent part 22 Boundary 3, 3A between folded part and reinforcing sheet (third raw material sheet) Outer layer sheet ( elastic sheet)
31, 32 fiber sheet 33 elastic filament 4 inner layer sheet (first raw material sheet)
5 Reinforcement sheet (third raw material sheet)
6 Functional sheet (fourth raw material sheet)
7 Target tape (second raw material sheet)
8 Elastic member 9 Joining part 10 Underpants-type disposable diaper 11 Absorbent pad part 12 Top sheet 13 Back sheet 14 Absorbent core 15 Leakage prevention cuff 16 Fastening tape 17 Holder part 70 Elastic laminate manufacturing device 71 First manufacturing department 72 Second manufacturing department 73 Joining means 74 Cutting means 75 Sheet rotating regions 76, 77 Joining means 78 Sheet pulling means 80 Original fabric sheet precursor 90 Original fabric sheet 91 First continuous sheet 91a Cut edge 92 of the first continuous sheet Second second Continuous sheet 92a Cut edge 93 of second continuous sheet Continuous laminated body 93a Cut edge 94 of continuous laminated body Projection 95 Temporary joint CL Planned cutting line

Claims (7)

A first stretchable sheet having stretchability in one direction and a second stretchable sheet having stretchability in one direction and superimposed on one surface of the first stretchable sheet, both stretchable sheets , are joined to each other at a pair of joint portions formed at both ends in the one direction, and are not joined to each other at a portion sandwiched between the pair of joint portions, and are sandwiched between the pair of joint portions. A method for producing an elastic laminate in which a portion can form an annular structure having elasticity in the circumferential direction,
A raw sheet containing a continuous band-shaped elastic sheet that is continuous in one direction and stretched in the one direction is conveyed in the one direction as the conveying direction, and is divided into two equal parts in the conveying orthogonal direction perpendicular to the conveying direction. A first continuous sheet cut along a planned cutting line that meanders with respect to a central straight line extending parallel to the conveying direction, and in which a plurality of the first stretchable sheets are continuous in the conveying direction; and the second stretchable sheet. a dividing step of dividing into a plurality of second continuous sheets continuous in the conveying direction;
A stacking step of obtaining a continuous laminate by stacking the first continuous sheet and the second continuous sheet so that the cut edges of both continuous sheets on the planned cutting line are aligned;
a temporary joining step of forming a temporary joining portion by joining the two continuous sheets forming a convex portion that protrudes outward in the conveying orthogonal direction at the cut edge portion of the continuous laminate;
A joining step of intermittently forming the joining portion in the continuous laminate in the conveying direction;
A method for producing a stretchable laminate, comprising a step of cutting the continuous laminate in the direction orthogonal to the conveying direction to obtain a sheet of the stretchable laminate. The method for manufacturing an elastic laminate according to claim 1, wherein in the temporary joining step, the temporary joining portion is formed on the top portion of the convex portion. In the temporary joining step, in the vicinity of the planned cutting position in the single-wafer forming step in the continuous laminate, and at the planned formation positions of the pair of joint portions located on both sides in the conveying direction across the planned cutting position. The method for manufacturing an elastic laminate according to claim 1 or 2, wherein the temporary joint portion having a shorter length in the direction perpendicular to conveyance than the pair of joint portions to be formed is formed between them. The method for producing an elastic laminate according to any one of claims 1 to 3, wherein after the temporary joining step and before the joining step, the temporary joining portion is stretched outward in the direction perpendicular to the transport direction. . 5. Any one of claims 1 to 4, wherein in the sheeting step, the continuous laminated body is cut in the transport orthogonal direction between one joint portion and the other joint portion constituting the pair of joint portions. 10. A method for producing the elastic laminate according to the item. The method for producing a stretchable laminate according to any one of claims 1 to 5, wherein the temporary joints and the joints are formed by fusing the materials forming the parts by ultrasonic waves or heating. Prior to the dividing step, having a manufacturing step of the raw fabric sheet,
In the raw sheet manufacturing process, a continuous belt-like first raw material sheet is arranged on one surface of the stretchable sheet being conveyed in the one direction so as to overlap the planned cutting line, and the other side of the stretchable sheet is arranged. A pair of continuous strip-shaped second raw material sheets are arranged on both sides of the plane of the plane in the direction perpendicular to the conveyance to obtain a raw fabric sheet precursor, and further constitute the raw fabric sheet precursor. The method for producing the elastic laminate according to any one of claims 1 to 6, wherein the sheets are joined together.

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