CN104703566A - Manufacturing method for stretch laminate and device - Google Patents

Abstract

The present invention is a manufacturing method for a stretch laminate (W) which stretches and contracts in a width direction (Y), upon which a plurality of linear elastic members (F) are disposed so as to extend in the width direction (Y) between a first sheet (S1) and a second sheet (S2) across a transport direction (X) of the sheets (S1 and S2), wherein the method is provided with a step in which: on the surface of a folded-back roll (8) which becomes of smaller diameter toward both ends from the center of the width direction (Y), a complex (W1) is transported while coming into tactile contact with the surface on the opposite side of the first sheet (S1) in the second sheet (S2) of the complex (W1), whereupon, by the central portion (Wc) of the complex (W1) shrinking in the width direction (Y) so as to accompany shrinking of the central portion (Fc) of the elastic member (F), the folded-back portions (Sf) of the first sheet (S1) are folded back so as to overlap both side edge portions (Se) of the second sheet (S2).

Description

Method and device for manufacturing stretchable laminated body

technical field

The present invention relates to a method and an apparatus for manufacturing a stretch laminated body.

Background technique

Disposable diapers and underpants adopt a structure in which a stretchable laminate is disposed on side walls and a main body so that the diaper and the like are fitted to the body. As a method for producing such a stretchable laminate, a method is known in which a helical elastic member is fed between a pair of belts held by nip rollers in a direction intersecting with the conveying direction of the belt using a conveyor belt, This elastic member is sandwiched between the pair of belts and fixed (Patent Document 1).

In addition, after sandwiching the elastic member with two sheets, the elastic member is cut on both sides of the conveying mechanism, and the laminated sheet is removed from the conveying mechanism. However, in order to cover the shrunk end of the cut elastic member, it is necessary One of the two sheets is folded at both side edges, and then folded back after being sandwiched.

prior art literature

patent documents

Patent Document 1: JP63-243309A (Fig. 7)

Patent Document 2: JP2001-518061A

However, it is difficult to fold back both side edges of the folded sheet once.

Contents of the invention

Therefore, an object of the present invention is to provide a method and an apparatus for producing a stretchable laminate that can smoothly fold back both side edges of a once-folded sheet.

The present invention relates to a method for producing a stretchable laminate in which a plurality of linear elastic strips extending in a width direction transverse to a conveying direction of the sheets are arranged between a first sheet and a second sheet. member, and the telescopic laminate expands and contracts in the width direction,

The manufacturing method of the telescopic laminate includes the following steps:

A step of folding both side edges of the first sheet along the conveying direction to form a folded portion, in which the folded portion is not sandwiched between the first sheet and the second sheet. folding said first sheet in a manner between the sheets;

The process of winding the elastic member in a tensioned state on two sets of conveyor belts in a helical shape;

The elastic member is sandwiched between the non-folded portion of the first sheet that is not folded and the second sheet so that the center of the two sheets and the elastic member in the width direction A process in which parts are attached to each other to form a complex;

the step of cutting the elastic member at a portion of the elastic member protruding from the first sheet and the second sheet in the composite; and

The complex is conveyed while the surface of the second sheet opposite to the first sheet of the complex is brought into contact with the surface of the turning roller, and the elastic member shrinks when the central portion of the elastic member shrinks. The central portion of the composite is shrunk in the width direction so that each folded portion of the first sheet overlaps each side edge portion of the second sheet along the conveying direction. In the turning-back step, the turning-back roller has an axis extending in a direction perpendicular to the direction in which the composite is conveyed, and has two portions whose diameter decreases from the center toward both ends in the width direction.

On the other hand, the present invention relates to an apparatus for manufacturing a stretchable laminate in which a line extending in a width direction transverse to a conveying direction of the sheets is arranged between a first sheet and a second sheet. a plurality of elastic members, and the stretch laminate expands and contracts in the width direction,

The manufacturing device of the stretchable laminate includes:

A flap that folds both side edges of the first sheet along the conveying direction so that the folded portion is not sandwiched between the first sheet and the second sheet performing the folding of the first sheet in a manner;

two sets of belts separated from each other in the width direction of the elastic member;

a spinner, which winds the elastic member helically around the two sets of conveyor belts in a tensioned state;

a pair of pinch rollers that pinch the elastic member between the non-folded portion of the first sheet that is not subjected to the folding and the second sheet so that the two sheets and the The central parts in the width direction of the elastic members are attached to each other to form a complex;

a cutter that cuts the elastic member at a portion of the elastic member in the composite that protrudes from the first sheet and the second sheet; and

a turn-back roller having an axis extending in a direction perpendicular to the direction in which the composite is conveyed, and having two portions whose diameters decrease from the center in the width direction toward both ends, and while making the composite The surface of the second sheet of the body opposite to the first sheet is brought into contact with the surface of the turning roller while the composite is conveyed, and the central portion of the elastic member shrinks, causing the The central portion of the composite is shrunk in the width direction so that each folded portion of the first sheet is folded back so as to overlap each side edge portion of the second sheet along the conveyance direction.

In the present invention, the turn-back roller has a surface including two portions whose diameters decrease from the center toward both ends in the width direction, and when the composite body is conveyed while being in contact with the turn-back roller, the elastic member The central portion shrinks, and the central portion of the composite shrinks in the width direction. Therefore, the folded portion of the first sheet is folded back in a direction opposite to the direction in which the central portion shrinks to overlap both side edge portions of the second sheet. Therefore, it is possible to smoothly perform folding back of both side edge portions of the folded sheet.

Description of drawings

FIG. 1 is a schematic perspective view showing a manufacturing apparatus of the present invention.

Fig. 2 is a schematic perspective view showing an upstream portion of the device.

Figure 3 is a side view of a part of the device, namely the spinner.

Fig. 4 is a schematic perspective view showing the downstream portion of the conveyor of the apparatus.

Fig. 5 is a schematic plan view showing the upstream portion of the device.

Fig. 6 is a layout view of the device viewed from the side.

7A and 7B are cross-sectional views showing a state where the stretchable laminate is in contact with the folding roller.

8A , 8B, 8C, and 8D are cross-sectional views showing steps of the manufacturing method, respectively.

9A , 9B, 9C, and 9D are cross-sectional views showing steps of the manufacturing method, respectively.

Detailed ways

In a preferred method, a step of joining the folded-back portion of the first sheet and both side edges of the second sheet to each other is further included.

In addition, in a preferable device, a joining device for joining the folded-back portion of the first sheet and both side edges of the second sheet is further provided.

In these cases, both ends of the stretchable laminate are not stretched, but the central portion is stretched, and can be used as an easy-to-use member of a wearing article.

Example

The present invention can be more clearly understood from the following description of preferred embodiments with reference to the attached documents. However, the examples and drawings are only for illustration and description, and should not be used to limit the scope of the present invention. The scope of the invention is defined by the claims. In the drawings, the same reference numerals in a plurality of drawings indicate the same or corresponding parts.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an apparatus for manufacturing a stretch laminated body W. As shown in FIG.

In the stretchable laminate W of this embodiment, a linear elastic member F (F1, F2) extending in the width direction Y transverse to the conveying direction X of the sheets S1, S2 is interposed between a pair of sheets S1, S2. ), as shown in FIGS. 9C and 9D , the stretchable laminate W expands and contracts in the width direction Y. In addition, the said elastic|stretch laminated body W forms the side circumference of a disposable diaper, shorts, and a waist circumference by cutting, for example.

In FIG. 1 , the sheets S1 and S2 may be continuous fabrics that are continuous in the conveying direction X, or fabrics or resin sheets that are discontinuous in the conveying direction X. In the case of the present embodiment, the elastic member F is a so-called rubber thread, but it may also be a belt-shaped rubber.

This manufacturing apparatus is provided with the spinner 2, the conveyer 1, a pair of cutter C, the 1st pinch roll 41, the 2nd pinch roll 42, etc. are provided. The conveyor 1 includes, for example, four first to fourth conveyor belts 11 to 14 and a drive device 3 .

As shown in FIG. 2 , the first conveyor belt 11 and the second conveyor belt 12 are disposed vertically close to each other. Moreover, the 3rd conveyor belt 13 and the 4th conveyor belt 14 are arrange|positioned so that it may approach mutually up and down. The first conveyor belt 11 and the second conveyor belt 12 (the first group of conveyor belts 1A) and the third conveyor belt 13 and the fourth conveyor belt 14 (the second group of conveyor belts 1B) are arranged so as to be opposite to each other in the width direction Y of the nip rollers 41 , 42 . separate.

The spinner 2 winds the elastic member F in a helical shape while being tightened by the two sets of conveyor belts 1A and 1B being driven. For example, the cup-shaped main body 20 of the rotator 2 rotates around the hollow shaft 21 shown in FIG. Pull out the front end.

On the other hand, the outer surfaces of the conveyor belts 11 to 14 in FIG. 2 rotate downstream in the conveyance direction X of the sheet S. As shown in FIG. Therefore, the elastic member F is continuously wound spirally around the two conveyor belts 1A, 1B in a state where tension is applied to the elastic member F, in other words, in a state where the elastic member F is stretched, and then conveyed downstream.

In FIG. 1 , the driving device 3 rotates the four conveyor belts 11 to 14 in order to convey the elastic member F in a tense state toward the downstream in the conveyance direction X of the conveyor belts 11 to 14 . In the case of this embodiment, as shown in FIG. 5 , the elastic members F are in contact with the upper surfaces and lower surfaces of the conveyor belts 11 to 14 . The conveyor belts 11 to 14 shown in FIG. The elastic member F is fed between two sheets S1 , S2 and a pair of nip rollers 41 , 42 . In addition, the rotational speeds of the conveyor belts 11 to 14 are controlled so that the first portion F1 and the second portion F2 of the elastic member F become substantially parallel or nearly parallel to the axial direction Y of the nip rollers 41 and 42 .

In FIG. 4 , the driving device 3 has first to fourth motors M1 to M4 controlled by a control device 5 . The first motor M1 and the fourth motor M4 respectively drive the first conveyor belt 11 and the fourth conveyor belt 14 to rotate at a high speed VH. On the other hand, the second motor M2 and the third motor M3 respectively drive the second conveyor belt 12 and the third conveyor belt 13 to rotate at a low speed VL that is lower than the high speed VH. Through the speed difference of the conveyor belt, the first part F1 and the second part F2 of the elastic member F at the position clamped by the pinch rollers 41, 42 (FIG. 6) of FIG. (FIG. 6) are approximately parallel to each other.

In addition, in FIG. 4, meshes are applied to the belts 11 and 14 driven at high speed VH.

In FIG. 2 , a known baffle plate 6 is disposed upstream of the first nip roll 41 . The flapper 6 folds both side edge portions Se of the first sheet S1, and is performed in such a manner that the folded portion Sf after folding is not sandwiched between the first sheet S1 and the second sheet S2. The folding of the first sheet S1. In other words, the flapper 6 folds both side edge portions Se of the first sheet S1 toward the first pinch roller 41, and the folded portion Sf is sandwiched between the first pinch roller 41 and the non-folded portion Sn of the first sheet S1. between. In other words, the folded portion Sf is folded so as to overlap the surface Ss of the first sheet S that is in contact with the first nip roller 41 .

As shown in FIG. 9A , the width of the first sheet S1 in the unfolded state is the same as that of the second sheet S2 . In the case of this embodiment, as shown by the two-dot chain line in FIG. 8B , the length of the first nip roller 41 is shorter than that of the second nip roller 42 and enters the space between the two sets of conveyor belts 1A, 1B. On the other hand, the length of the 2nd nip roller 42 is longer than the width|variety of the said space, and is arrange|positioned below the conveyor belts 11-14.

The first nip roller 41 and the second nip roller 42 of FIG. 6 make the elastic member F (FIG. 5) sandwiched between the pair of sheets S1, S2 and attached to the nip position O at the nip position O. The above sheets S1 and S2 form the composite W1 in FIG. 8C. That is, the pair of pinch rollers 41, 42 of FIG. 2 pinches the elastic member F between the unfolded non-folded portion Sn of the first sheet S1 and the second sheet S2 (F1 , F2), the central part in the width direction Y of the said two sheets S1, S2 and the said elastic member F is bonded together, and the composite W1 is formed.

As a method of attaching the elastic member F to the sheets S1, S2, it is also possible to coat and adhere the surface of the second sheet S2 shown in FIG. 6 from the coating machine 7 to the surface facing the first sheet S1. agent. For example, the coater 7 is disposed upstream of the second nip roller 42 (upstream of the nip position O). This coater 7 coats the linear adhesive which is mutually parallel to the surface of the 2nd sheet|seat S2 and extends along a conveyance direction.

A pair of cutters C, C shown by dashed-two dotted lines in FIG. 8C are arranged on the slightly downstream side of the nip point O in FIG. It should be noted that illustration of the cutter C is omitted in FIG. 6 .

The cutter C cuts the elastic member F at a portion where the elastic member F protrudes from the first sheet S1 and the second sheet S2 in the composite W1.

It should be noted that, as shown in FIGS. 8C and 8D , the parts of the elastic member F after cutting that are not bonded to the sheets S1 and S2 , in other words, both ends Fe shrink immediately by removing the tension.

As shown in FIGS. 2 and 5 , the return roller 8 is arranged downstream of the pair of nip rollers 41 and 42 .

The return roller 8 has an axis 8c extending in the width direction Y perpendicular to the conveyance direction X of the complex W1, and its diameter decreases from the center in the width direction Y toward both ends 8e, as shown in FIG. 7A . As shown, the surface of the return roller 8 is in contact with the surface of the second sheet S2 of the composite W1 that is opposite to the first sheet S1.

That is, as shown in FIG. 2 , the turning roller 8 has tapered cylindrical surfaces on both side edges, and there is a gap between the tapered cylindrical surfaces along the width direction Y relative to the axis. 8c A flat or gently curved cylindrical surface.

It should be noted that, in the present invention, the “center” of the turning roller 8 in the width direction Y refers to a region including the center of the turning roller 8 in the width direction Y and excluding both ends of the roller 8 in the width direction Y.

The return roller 8 conveys the composite W1 while being in contact with the second sheet S2, and moves the central portion Wc of the composite W1 in the width direction as the central portion Fc of the elastic member F contracts. Y shrinks, whereby the folded portion Sf of the first sheet S1 is folded back toward both side edges in the width direction Y of the turn-back roller 8 as shown in FIG. The edge Se overlaps. Thereby, the stretchable laminated body W shown in FIG. 9A and FIG. 9B is produced.

As shown in FIG. 6 , a deflection roller 10 and a joining device 9 are disposed further downstream of the return roller 8 . This joining device 9 performs embossing as shown in FIG. 9C , and joins the folded-back portion of the first sheet S1 and both side edges Se of the second sheet S2 to each other.

Next, a method for manufacturing the stretchable laminate W will be described.

Both side edge parts Se along the conveyance direction of the 1st sheet|seat S1 of FIG. 1 are bent by the flapper 6. As shown in FIG. In the process of folding both side edges Se of the first sheet S1, as shown in FIG. 8A , the folded portion Sf after folding is not sandwiched between the first sheet S1 and the second sheet S2. Fold back the first sheet S1 in an intermediate manner. That is, the folded portion Sf is folded so that the folded portion Sf overlaps the surface Ss that contacts the first nip roller 41 . On the other hand, the adhesive D is applied from the applicator 7 to the center portion Sc of the second sheet S2 in FIG. 8A .

In the state where the conveyor belts 11 to 14 in FIG. 1 are driven and rotated by the driving device 3 , the elastic member F is sent out from the spinner 2 in FIG. 2 , and the elastic member F is wound around the conveyor belts 11 to 14 in a stretched state. Thereby, the elastic member F is conveyed toward the downstream of the conveyance direction X, winding helically around the conveyor belts 11-14.

That is, the 1st part F1 and the 2nd part F2 of the elastic member F are conveyed along the upper surface and the lower surface of the conveyor belts 11-14 in the state slightly inclined with respect to the axial direction Y. Afterwards, utilizing the speed difference between the first conveyor belt 11 driven with the high speed VH and the fourth conveyor belt 14 of FIG. 4 and the second conveyor belt 12 driven with the low speed VL and the third conveyor belt 13, as shown in FIG. 5 As shown, the first part F1 and the second part F2 are approximately parallel to the axial direction Y of the nip roller 41, and are supplied between the nip rollers 41, 42 in FIG. 2 .

On the other hand, the two sheets S1 , S2 are fed between a pair of nip rollers 41 , 42 .

That is, the elastic member F is fed between the two sheets S1 and S2 in a state where the first portion F1 and the second portion F2 of the elastic member F are separated from each other in the conveyance direction X. At this time, the first part F1 and the second part F2 are fed between the two sheets S1 and S2 in a state of being separated from each other in the thickness direction Z of the sheets S1 and S2 shown in FIG. 8A . .

Thereafter, the elastic member F is conveyed to the nip position O along the circumferential direction R of the nip rollers 41 , 42 . After this conveyance, the elastic member F is sandwiched between the two sheets S1, S2 by the pair of nip rollers 41, 42, and the elastic member F shown in FIG. 8B is arranged one by one with the two sheets. S1, S2 bonded state.

That is, the elastic member F is sandwiched between the unfolded non-folded portion Sn of the first sheet S1 and the second sheet S2, so that the two sheets S1, S2 and all The central parts Sc and Fc in the width direction Y of the elastic member F are bonded to each other to form a composite W1.

After the arrangement, for example, after the elastic member F is sandwiched between the pair of sheets S1, S2, as shown in FIG. part, using a pair of cutters C, C to cut off the elastic member F between the first part F1 and the second part F2 one by one. At this time, in the elastic member F of FIG. 8D , both end portions Fe not bonded to the sheets S1 and S2 undergo so-called retraction and shrink.

In this way, the complex W1 of FIG. 8D in which the first parts F1 and the second parts F2 of FIG. 5 are alternately parallel to each other and regularly arranged at a predetermined pitch P is generated.

For the composite W1 of FIG. 8D , as shown in FIG. 7A , while the surface of the second sheet S2 of the composite W1 opposite to the first sheet S1 is brought into contact with the surface of the turning roller 8 , The complex W1 was transported.

Here, as shown in FIG. 7A , the turn-back roller 8 has a surface including two portions 82 , 82 whose diameters decrease from the center toward both ends in the width direction Y, with The center portion Wc of the composite body W1 tends to shrink due to the contraction force of the elastic member F, and the folded portion Sf of the first sheet S1 is folded back as shown in FIGS. 7B and 9A . That is, as the central portion Fc of the elastic member F in FIG. 8D shrinks, the central portion Wc of the composite W1 shrinks in the width direction Y, thereby acting to make the folded portion Sf of the first sheet S1 With the force of turning back as indicated by the arrow Ar, the folded portion Sf is folded back as shown in FIG. 9A and overlaps both side edge portions Se of the second sheet S2.

The composite W1 shrinks in the width direction Y, whereby the length in the width direction Y of the composite W1 (stretch laminated body W) shown in FIG. 7B is shorter than the length in the width direction Y of the composite W1 shown in FIG. 7A .

In this way, the stretchable laminated body W shown in FIGS. 9A and 9B is produced.

In addition, in the above-mentioned overlapping process and after, the central part Fc, Wc of the elastic member F and the composite body W1 shrinks like FIG. 9B.

After the shrinkage, the stretchable laminated body W is supplied from the turning roll 10 of FIG. The folded-back portion of the first sheet S1 is joined to both side edges Se of the second sheet S2. It should be noted that this bonding may be accomplished using an adhesive and nip rolls, or may be performed by welding.

In this way, as shown in FIGS. 9C and 9D , a stretchable laminate W in which the central portion Wc is stretched and the both ends We are not stretched is obtained. In addition, the said elastic laminated body W may be cut|disconnected along the cutting line extended in the width direction Y, and may be used as a side wall.

Among them, the turning roller 8 of FIG. 7A has a truncated conical tapered cylindrical surface 82 at both ends of a cylindrical surface 81 . That is, the cylindrical surface 81 is flat or gently curved with respect to the axis 8c, and the tapered cylindrical surface 82 is inclined more largely than the cylindrical surface 81 with respect to the axis 8c. However, the surface of the return roller 8 may be curved with respect to the axis 8c, for example, may be barrel-shaped or the like.

In addition, as shown in FIG. 6 , the turn-back roller 8 may be configured to be rotatable and fixed around the arm 89 around the fixed shaft 88 , so that the position adjustment of the turn-back roller 8 can be easily performed.

In addition, engaging portions for engaging with the elastic member F may be provided on both ends of the pinch rollers 41 and 42 in FIG. F.

It should be noted that the elastic member F may also be formed in a belt shape.

In addition, as disclosed in JP63-243309A, the elastic members F1 and F2 may be clamped by a pair of belt-shaped narrow belts, and after the elastic member F is clamped by the pair of belt-shaped belts, , the elastic member F is sandwiched by another sheet having a wide width.

As described above, preferred embodiments have been described with reference to the drawings, but it is assumed that those skilled in the art can easily make various changes and modifications within the self-evident range on the basis of reading this specification.

For example, one or both of the sheets S1 and S2 may not be a continuous sheet but a discontinuous sheet. In addition, a plurality of sets of this manufacturing apparatus may be installed in parallel. In addition, the pair of sheets may be welded instead of bonded.

In addition, the elastic member may be cut by fusing.

In addition, the first part and the second part of the elastic member do not need to be parallel to each other, and may be arranged on the sheet in an inclined state.

In addition, the spinner may be provided with a plurality of lead-out parts for the elastic members, and the plurality of elastic members may be led out from the spinner.

Alternatively, the lengths of the pair of nip rollers 41, 42 in the width direction Y may be reduced, and the nip position O may be located between the two sets of conveyor belts 1A, 1B.

Therefore, the above changes and corrections should be construed as being included in the scope of the present invention defined by the claims.

Industrial availability

The present invention can be applied to manufacture of a stretchable laminate in which a plurality of linear elastic members are arranged on a sheet.

Explanation of reference signs

1: conveyor; 1A: first set of conveyor belts; 1B: second set of conveyor belts

1C: center line; 11~14: first to fourth conveyor belts

2: rotator; 20: main body; 21: hollow shaft; 22: pulley

3: Drive device

41, 42: pinch roller

5: Control device

6: Baffle

7: Coating machine

8: folding roller; 8c: axis; 8e: both ends; 81: cylindrical surface; 82: tapered cylindrical surface

9: Engagement device

C: Cutter

D: Adhesive

F: elastic member; F1: first part; F2: second part; Fc: central part; Fe: both ends

M1: first motor; M2: second motor; M3: third motor; M4: fourth motor

N: normal direction (radial)

O: clamping position

R: Circumferential

S1: first sheet; Se: both side edges; Sf: folded portion; Sn: non-folded portion

S2: second sheet; Sc: central part; Ss: surface in contact with first nip roller

T: Tangent direction

X: Transport direction; Y: Width direction, axial direction; Z: Thickness direction

W: Stretch laminate; W1: Composite; Wc: Central part; We: Both ends

Claims (4)

1. the manufacture method of a flexible duplexer, this flexible duplexer configures multiple elastic components of the wire that the width along the carrying direction of sheet material described in crosscut extends between the first sheet material and the second sheet material, and this flexible duplexer is flexible on described width

The manufacture method of described flexible duplexer comprises the following steps:

The edge, both sides along described carrying direction of described first sheet material folded and forms the operation of folding part, in this operation, folding described first sheet material to make the described folding part mode be not clipped between described first sheet material and the second sheet material;

Described elastic component is wound in the shape of a spiral the operation of two groups of conveyer belts with tensioned state;

Described first sheet material do not carry out clamp described elastic component between described folding non-collapsible portion and described second sheet material, make the middle body of the width of described two sheet materials and described elastic component bonded to each other and form the operation of complex;

The part of stretching out from described first sheet material and the second sheet material of the described elastic component in described complex cuts off the operation of described elastic component; And

Make the face of the same described first sheet material opposite side of described second sheet material of described complex and the surface contact of roller of turning back while carry described complex, middle body along with described elastic component shrinks and the middle body of described complex is shunk on described width, thus by each folding part of described first sheet material with the operation of turning back with the mode overlapping along each side edge part in described carrying direction of described second sheet material, the described roller that turns back has the axis extended on the direction that the carrying direction with described complex is orthogonal, and central authorities two positions that diameter reduces towards two ends had from described width.

2. manufacture method according to claim 1, wherein,

Described manufacture method also possesses the operation that the part of turning back of described first sheet material is bonded with each other with the edge, both sides of described second sheet material.

3. the manufacturing installation of a flexible duplexer, this flexible duplexer configures multiple elastic components of the wire that the width along the carrying direction of sheet material described in crosscut extends between the first sheet material and the second sheet material, and this flexible duplexer is flexible on described width

The manufacturing installation of described flexible duplexer possesses:

Baffle plate, the edge, both sides along described carrying direction of its folding described first sheet material, and perform the folding of described first sheet material to make having carried out this folding folding part mode be not clipped between described first sheet material and the second sheet material;

Two groups of conveyer belts, they are separated from each other on the described width of described elastic component;

Rotator, described elastic component is wound in described two groups of conveyer belts with tensioned state by the shape of a spiral;

A pair niproll, they described first sheet material do not carry out clamp described elastic component between described folding non-collapsible portion and described second sheet material, make the middle body of the width of described two sheet materials and described elastic component bonded to each other and form complex;

Sickle, the part of stretching out from described first sheet material and the second sheet material of its described elastic component in described complex cuts off described elastic component; And

Turn back roller, it has the axis extended on the direction that the carrying direction with described complex is orthogonal, and central authorities two positions that diameter reduces towards two ends had from described width, and make the surface contact of the face of the same described first sheet material opposite side of described second sheet material of described complex and the described roller that turns back while carry described complex, middle body along with described elastic component shrinks and the middle body of described complex is shunk on described width, thus by each folding part of described first sheet material to turn back with the mode overlapping along each side edge part in described carrying direction of described second sheet material.

4. manufacturing installation according to claim 3, wherein,

Described manufacturing installation also possesses the engagement device that the part of turning back of described first sheet material is bonded with each other with the edge, both sides of described second sheet material.