JP5838027B2 - Method for producing elastic sheet - Google Patents

Description

  The present invention relates to a method for producing an elastic sheet.

  From the standpoint of saving materials as much as possible, reducing waste as much as possible, environmentally friendly, and reducing costs, a waist panel material with fastening tape is manufactured in a separate process, and the rectangular absorbency including the absorber An unfolded disposable diaper manufactured by adding this waist panel material to a main body is known. The waist panel material is preferably a stretchable member from the viewpoint of wearability, and the waist panel material is generally formed using a stretchable film. However, since a stretchable film is expensive, it is preferable to form a waist panel material using a so-called thread rubber that is a general-purpose elastic member. However, when the process of obtaining the waist panel material using the rubber thread and the process of adding the waist panel material to the absorbent main body to obtain the deployable disposable diaper are continuously performed in a series of flows, the rubber thread is used. The stretch direction of the waist panel material formed by using is generally the same direction as the transport direction of the absorbent main body, and is a direction orthogonal to the stretch direction of the waist panel material required when the unfolded disposable diaper is worn. Therefore, when manufacturing a deployable disposable diaper by adding a waist panel material formed using thread rubber to the absorbent main body in an in-line process, the waist panel material formed using thread rubber is inverted 90 degrees and absorbed. It is necessary to add to the sex body. Thus, since the apparatus which reverses a waist panel material 90 degree | times is needed separately, an increase in capital investment will be caused.

  As a method not using the 90-degree reversing apparatus as described above, for example, in Patent Document 1 and Patent Document 2, an adhesive is applied to a water-permeable sheet that is running in the length direction, and the adhesive-coated surface is applied. A step of translating a tensioned thread-like elastic body in a zigzag state along the sheet surface of the traveling sheet and in the sheet traveling direction, and bonding the thread-like elastic body to the sheet in an extended state; The manufacturing method of the elastic sheet which performs the process of cut | disconnecting the said thread-like elastic body at both ends is described. Patent Document 1 also describes a method of rearranging the zigzag thread-like elastic bodies in parallel.

  When used as a constituent material of a product that is worn on the body such as a disposable diaper, there are cases where further flexibility and stretchability are required, but Patent Document 1 and Patent Document 2 include flexibility and stretchability. There is no disclosure on how to improve the above.

Japanese Patent No. 2602221 JP 2010-22588 A

  Therefore, the subject of this invention is providing the manufacturing method of the elastic sheet which can eliminate the fault which the prior art mentioned above has.

The present invention is a method for producing a stretchable sheet for continuously producing a stretchable sheet in which a thread-like elastic body is stretched between a pair of beltlike sheets in a direction extending in a direction intersecting the transport direction of the beltlike sheet. ,
A feeding step of continuously feeding out the thread-like elastic body and introducing the fed-out thread-like elastic body into an elastic body winding means; and a longitudinal structure for transferring the thread-like elastic body using the elastic body winding means. The thread-like elastic body is continuously wound around a body, and the wound elastic body is transported in the longitudinal direction of the longitudinal structure for thread transportation, and the conveyed thread-like elastic body is fixed between the belt-like sheets. An integration step, a stretching step of stretching the pair of belt-like sheets, and a cutting step of cutting the thread-like elastic body extending from each of both ends in the width direction of the pair of belt-like sheets, The manufacturing method of the elastic sheet which extends a pair of said strip | belt-shaped sheet | seat using a pair of uneven | corrugated roller in which the large diameter part and the small diameter part were formed alternately is provided.

  According to the method for producing an elastic sheet of the present invention, the flexibility of the produced elastic sheet is improved and the elasticity is also improved. In addition, when the stretchability is improved in this way, the same stretch performance and stretch force as in the conventional case are exhibited, but the material is stretched with less material than in the conventional case, and the material cost can be reduced.

FIG. 1 is a plan view of a deployable disposable diaper in which a stretchable sheet according to a first embodiment obtained by the stretchable sheet manufacturing method of the present invention is used for a waist panel. FIG. 2 is a schematic view showing a manufacturing apparatus for manufacturing the waist panel of the unfolded disposable diaper shown in FIG. 1 according to the first embodiment of the present invention. FIG. 3 is a schematic view showing an elastic body supply means for introducing a thread-like elastic body into the rotating arm shown in FIG. 4 is an enlarged cross-sectional view of a main part taken along line X1-X1 in FIG. FIG. 5 is a plan view of an unfolded disposable diaper in which a stretchable sheet according to a second embodiment obtained by the stretchable sheet manufacturing method of the present invention is used for a waist panel. FIG. 6 is a schematic view showing a manufacturing apparatus for manufacturing the waist panel of the unfolded disposable diaper shown in FIG. 5 according to the second embodiment of the present invention.

Hereinafter, the manufacturing method of the elastic sheet of this invention is demonstrated, referring drawings based on the preferable 1st embodiment.
As shown in FIG. 1, the stretchable sheet manufactured in the first embodiment is used for, for example, the waist panel 3 </ b> A of the unfolded disposable diaper 1. Therefore, first, the unfoldable disposable diaper 1 using the stretchable sheet manufactured according to this embodiment for the waist panel will be described.

As shown in FIG. 1, the unfoldable disposable diaper 1 (hereinafter also referred to as “diaper 1”) includes a ventral side A located on the abdomen side of the wearer and a dorsal side B positioned on the dorsal side when worn. , And an absorbent main body 2 having a crotch C positioned between the abdominal side A and the back side B, and a pair of left and right waist panels 3A, 3A connected to the left and right outside of the back side B And have. As shown in FIG. 1, the diaper 1 has a pair of left and right panel members 4, 4 connected to the left and right outer sides of the ventral side A. In addition, as shown in FIG. 1, the absorptive main body 2 of the diaper 1 has a rectangular shape in a state of being expanded in a planar shape. Moreover, as shown in FIG. 1, the panel material 4 of the diaper 1 has a trapezoidal shape in a state of being spread in a flat shape, and the lower bottom side having a long length is formed by an absorbent body or an adhesive body by means such as adhesive or fusion. 2 is fixed.
In the following description, the longitudinal direction of the absorbent main body 2 (also the longitudinal direction of the diaper 1) will be described as the Y direction, and the width direction of the absorbent main body 2 (also the width direction of the diaper 1) will be described as the X direction.

  Each of the pair of waist panels 3A and 3A has a rectangular shape in a state of being expanded in a planar shape. Each waist panel 3 </ b> A has two sheets 5, 6 and a plurality of thread-like elastic bodies 7 arranged in an extended state between the two sheets 5, 6. Each waist panel 3 </ b> A is made of an elastic sheet that is fixed between the pair of sheets 5 and 6 in a state where the thread-like elastic body 7 extends in a direction intersecting the Y direction. Specifically, as shown in FIG. 1, each waist panel 3 </ b> A extends in a direction (X direction) perpendicular to the Y direction between two rectangular sheets 5 and 6 having the same shape and the same size. The thread-like elastic bodies are formed at substantially equal intervals in the Y direction and integrally fixed by means such as an adhesive or fusion. In the rectangular waist panel 3A formed in this way, a fastening tape 8 is fixed to an end portion on the outer side in the X direction by means such as adhesive or fusion. Further, the rectangular waist panel 3A has an end portion on the inner side in the X direction fixed to the back side portion B of the absorbent main body 2 by means such as adhesive or fusion, and the outside of the back side portion B in the X direction. It is connected to the direction. In addition, although the threadlike elastic body 7 which the waist panel 3A (elastic sheet) manufactured by this embodiment has is extended in the direction orthogonal to the Y direction, if it is extended in the direction intersecting with the Y direction. Good.

Moreover, as shown in FIG. 1, the waist panel 3A (elastic sheet) manufactured in the present embodiment is stretched in the X direction over the entire area in the Y direction. That is, as shown in FIG. 1, the stretched region 30A is formed over the entire area in the Y direction of the waist panel 3A. The waist panel 3A (elastic sheet) preferably has a basis weight of about 10 to 50 g / m ² and a thickness of about 0.1 to 1 mm. The degree of stretchability in the X direction of the waist panel 3A (stretchable sheet) is preferably 30 to 250 cN / 25 mm, and more preferably 50 to 200 cN / 25 mm when 100% stretched. Regarding the bending rigidity, which is a measure of flexibility, the bending rigidity of the waist panel 3A (elastic sheet) is preferably 15 g / 30 mm or less. The bending stiffness is measured in accordance with JIS L-1096, and is obtained as an average value when bent in the Y direction and the X direction, respectively, under the conditions of an indentation amount of 8 mm by a handle ohmmeter and a slit width of 10 mm.

  As shown in FIG. 1, the absorbent main body 2 includes a liquid-permeable top sheet 21, a liquid-impermeable or water-repellent back sheet 22, and a liquid-retaining property interposed between the two sheets 21 and 22. And an absorber 23. As shown in FIG. 1, the absorbent main body 2 includes a top sheet 21 that forms the inner surface of the diaper 1 and a back sheet 22 that forms the outer surface of the diaper 1, with an absorber 23 interposed between the two sheets 21 and 22. It is formed by joining. Moreover, the absorptive main body 2 is provided with three-dimensional guard forming sheets 24, 24 along both sides in the Y direction, as shown in FIG. The three-dimensional guard forming sheet 24 is fixed to the topsheet 21 along both sides in the Y direction of the absorbent main body 2. Each three-dimensional guard forming sheet 24 has a three-dimensional guard-forming elastic member 25 along the vicinity of the inner edge on the inner side in the X direction. A portion having a predetermined width is separated from the top sheet 21 to form a three-dimensional guard. Moreover, the elastic member 26 for leg gather formation is distribute | arranged to the part distribute | arranged around the leg of the longitudinal direction both sides of the absorptive main body 2. At the time of wearing, a leg gather is formed by the contraction of the elastic member 26 and fits well around the legs.

The material for forming the diaper 1 will be described.
As the sheet | seats 5 and 6 and the panel material 4 which comprise the waist panel 3A, if normally used for absorbent articles, such as a disposable diaper, it can use without a restriction | limiting especially. For example, as the sheets 5 and 6 and the panel material 4, a non-woven fabric, a woven fabric, a film, or a laminated sheet thereof can be used. As the surface sheet 21 and the back surface sheet 22 constituting the absorbent main body 2, as long as they are usually used for absorbent articles such as disposable diapers, they can be used without particular limitation. For example, a hydrophilic and liquid-permeable non-woven fabric can be used as the top sheet 21, and a liquid-impermeable or water-repellent resin film or a laminate of a resin film and a non-woven fabric is used as the back sheet 22. be able to. As the absorbent body 23, an aggregate of fibers such as pulp fibers (may be a non-woven fabric) or an absorbent core in which water-absorbing polymer particles are held therein, a core wrap made of water-permeable thin paper or non-woven fabric. What was covered with the sheet | seat etc. can be used. As the three-dimensional guard forming sheet 24 constituting the three-dimensional guard, a stretchable film, a nonwoven fabric, a woven fabric, or a laminated sheet thereof can be used. Examples of the elastic member 25 constituting the thread-like elastic body 7 and the three-dimensional guard include natural rubber, polyurethane, polystyrene-polyisoprene copolymer, polystyrene-polybutadiene copolymer, and polyethylene-α-olefin copolymer such as ethyl acrylate-ethylene. A thread-like stretchable material made of, for example, can be used. The filamentous elastic body in the present invention includes not only those having a circular or square cross section but also those having a narrow band shape such as an ellipse or a rectangular cross section, and a multifilament type can also be used. The width | variety (or diameter) of a thread-like elastic member is 0.1-3 mm, for example, Preferably it is 1 mm or less. As the fastening tape 8, for example, a tape formed by attaching a hook member of a mechanical fastener to one surface of a tape base material such as a nonwoven fabric by heat fusion or an adhesive can be used.

Next, a preferred first embodiment of the method for producing an elastic sheet of the present invention will be described with reference to the drawings, taking as an example the case of producing the waist panel 3A (elastic sheet) of the diaper 1 described above.
FIG. 2 schematically shows a manufacturing apparatus 11A that is preferably used in the method for manufacturing the waist panel 3A (elastic sheet) of the first embodiment.

As shown in FIG. 2, the manufacturing apparatus 11 </ b> A is an apparatus that continuously manufactures the waist panel 3 </ b> A (elastic sheet), and is a pair separated in a direction (x direction) orthogonal to the sheet conveyance direction (y direction). These conveyor belts 12 and 13 are provided with an elastic body winding rotary arm (elastic body winding means) 14 for continuously winding the thread-like elastic body 7. 2A and 2B, the manufacturing apparatus 11A continuously feeds the thread-like elastic body 7 and introduces the thread-like elastic body 7 into the rotating arm 14, and the pair of conveyances described above. Conveying means 16 for conveying the thread-like elastic body 7 between the pair of belt-like sheets 50 and 60 by the belts 12 and 13, and an integration means for fixing the elongated thread-like elastic body 7 between the pair of belt-like sheets 50 and 60 17, a stretching step 18 for stretching the pair of belt-like sheets 50, 60, and a cutting means 19 for cutting the thread-like elastic body 7 extending from both ends of the belt-like sheets 50, 60 in the width direction.
In this embodiment, the pair of conveying belts 12 and 13 is the longitudinal structure for yarn conveyance in the present invention, and the longitudinal direction of the longitudinal structure for yarn conveyance is the extending direction of the two conveying belts 12 and 13 ( y direction).

The conveyance direction of the sheet is the conveyance direction of the thread-like elastic body 7 wound around the pair of conveyance belts 12 and 13 or the conveyance direction of the sheet integrated with the thread-like elastic body 7 (band-like sheets 50 and / or 60). is there.
The y direction of the arrow in FIG. 2 indicates the conveyance direction of the thread-like elastic body 7 and the pair of belt-like sheets 50, 60, which is the conveyance direction of the sheet. Finally, the waist panel 3A (stretchable) manufactured according to this embodiment The conveying direction of the sheet) and the conveying direction of the continuous body of the diaper 1 to which the waist panel 3A (elastic sheet) is attached are the same direction.
Also, the x direction of the arrow in FIG. 2 is the width direction of the belt-like sheets 50 and 60, and is the direction orthogonal to the sheet conveying direction. Moreover, the z direction of the arrow in FIG. 2 is a direction in which a pair of concavo-convex rollers 171 and 172 described later face each other.

  As shown in FIG. 2, the conveyor belt 12 of the conveyor means 16 is an endless rotating belt, and includes an upper conveyor belt 12a and a lower conveyor belt 12b. The upper conveyance belt 12a is stretched between pulleys 121 and 122 whose rotation axis direction is arranged in the z direction. The lower conveyance belt 12b is bridged between pulleys 124 and 125 whose rotation axis direction is arranged in the z direction. The pulley 121 is located on the downstream side of the pair of uneven rollers 171 and 172 that extend the pair of belt-like sheets 50 and 60 in the x direction, and the pulley 122 is located on the upstream side of the uneven rollers 171 and 172. The pulley 124 is located on the downstream side of the uneven rollers 171 and 172, and the pulley 125 is located on the upstream side of the uneven rollers 171 and 172. The pulleys 121 and 124 are arranged at the same position in two upper and lower stages. Further, the pulleys 122 and 125 are also arranged in two upper and lower stages at the same position. Further, the pulley 121 (pulley 124) and the pulley 122 (pulley 125) are located outward in the x direction from the x direction end portions of the belt-like sheets 50 and 60. Each of the pulley 121 and the pulley 124 is provided with a servo motor (not shown) connected to its drive unit, so that the rotational speeds of the upper conveyance belt 12a and the lower conveyance belt 12b can be changed.

  As shown in FIG. 2, the conveyance belt 13 of the conveyance means 16 is an endless rotating belt, similar to the conveyance belt 12, and includes an upper conveyance belt 13a and a lower conveyance belt 13b. The upper conveyance belt 13a is stretched between pulleys 131 and 132 whose rotation axis direction is arranged in the z direction. The lower conveyance belt 13b is bridged between pulleys 134 and 135 whose rotation axis direction is arranged in the z direction. The pulley 131 is located on the downstream side of the pair of uneven rollers 171 and 172, and the pulley 132 is located on the upstream side of the uneven rollers 171 and 172. The pulley 134 is located on the downstream side of the uneven rollers 171 and 172, and the pulley 135 is located on the upstream side of the uneven rollers 171 and 172. The pulleys 131 and 134 are arranged in two upper and lower stages at the same position. Further, the pulleys 132 and 135 are also arranged in two upper and lower stages at the same position. Further, the pulley 131 (pulley 134) and the pulley 132 (pulley 135) are located outward in the x direction from the x direction ends of the belt-like sheets 50 and 60. Each of the pulley 131 and the pulley 134 is provided with a servo motor (not shown) connected to its drive unit, and the rotational speed of each of the upper conveyance belt 13a and the lower conveyance belt 13b can be changed.

  As shown in FIG. 2, the conveyor belt 12 (the upper conveyor belt 12 a and the lower conveyor belt 12 b) is bridged between the pulleys 121 and 122 and the pulleys 124 and 125 arranged as described above, so that the pair of concave and convex rollers 171. , 172 from the upstream side to the downstream side. The conveyor belt 13 (upper conveyor belt 13a and lower conveyor belt 13b) is connected to the pulleys 131 and 132 and the pulleys 134 and 135 arranged as described above so that the upstream side of the pair of uneven rollers 171 and 172. To the downstream side. Further, the transport belt 12 (upper transport belt 12a and lower transport belt 12b) and the transport belt 13 (upper transport belt 13a and lower transport belt 13b) are located outside the belt-like sheets 50 and 60 in the x direction and are symmetrical with each other. It is arranged in. The transport belt 12 (upper transport belt 12a, lower transport belt 12b) and transport belt 13 (upper transport belt 13a, lower transport belt 13b) rotate so that their outer peripheral sides move in the y direction. The transport belt 12 (upper transport belt 12a, lower transport belt 12b) and transport belt 13 (upper transport belt 13a, lower transport belt 13b) are preferably timing belts. The rotational speeds of the transport belt 12 (upper transport belt 12a, lower transport belt 12b) and transport belt 13 (upper transport belt 13a, lower transport belt 13b), that is, the driving units of the pulley 121 and pulley 124, and the pulley 131 and pulley 134, respectively. The rotation speed of a servo motor (not shown) arranged in the control is controlled by a control unit (not shown) provided in the manufacturing apparatus 11A.

  As shown in FIG. 2, the rotating arm 14 includes an arm portion 141 having a shaft portion 142, a revolving portion 143, and a connecting portion 144, and a drive mechanism 147 that rotates the arm portion 141 around the center line of the shaft portion 142. And. The connecting portion 144 is coupled to each of the shaft portion 142 and the rotating portion 143 at an angle, and the rotating portion 143 and the shaft portion 142 are substantially parallel. The shaft portion 142 has an introduction port 145 for the thread-like elastic body 7 at one end thereof, and the circumferential portion 143 has a lead-out port 146 for the thread-like elastic body 7 at one end thereof, which is introduced from the introduction port 145. The thread-like elastic body 7 is smoothly led out from the outlet port 146 through the shaft portion 142, the connecting portion 144 and the rotating portion 143. Various known members (a driven roll, a low friction member, etc.) that can reduce friction with the thread-like elastic body 7 can be disposed in the bent portion of the arm portion 141, the outlet port 146, and the like.

In the circulation part 143, the position of the outlet 146 is downstream from the upstream end of the transport belt 12 (upper transport belt 12a, lower transport belt 12b) and transport belt 13 (upper transport belt 13a, lower transport belt 13b). It is arranged in. The rotary arm 14 has a servo motor 148 attached to its drive part (shaft part 142), and the rotation part 143 causes the rotation part 143 to move the conveyor belt 12 (the upper conveyor belt 12a and the lower conveyor belt 12b) by the rotation of the servo motor 148. And the outer circumference of the conveyor belt 13 (the upper conveyor belt 13a and the lower conveyor belt 13b) is circulated. The diameter of the locus along which the outlet 146 rotates is greater than the distance between the outer surfaces of the pair of conveyor belts 12 and 13.
By such a rotating arm 14, the thread-like elastic body 7 taken in is fed to the upstream end of the transport belt 12 (upper transport belt 12a, lower transport belt 12b) and transport belt 13 (upper transport belt 13a, lower transport belt 13b). It is a part and can be continuously wound on each outer peripheral side. The rotation speed of the rotary arm 14, that is, the rotation speed of the servo motor 148 is controlled by a control unit (not shown) provided in the manufacturing apparatus 11A.

  As shown in FIG. 3, the elastic body supply means 15 is located on the downstream side of the bobbin 70 of the thread-like elastic body 7 and is located on the downstream side of the tensor 151 that tensions the thread-like elastic body 7 with a brake. A feeding roller 152 and a tension measuring device 153 located on the downstream side of the feeding roller 152 are provided. The feeding roller 152 has a rotational axis direction in the x direction. A servo motor (not shown) is attached to the driving portion of the feeding roller 152. The feeding roller 152 is used with the thread-like elastic body 7 wound around its outer periphery once or a plurality of times (preferably twice). A control unit (not shown) provided in the manufacturing apparatus 11A controls the rotation speed of a servo motor (not shown), that is, the rotation speed of the feeding roller 152 and the brake of the tensor 151 based on the detection output from the tension measuring device 153, The thread-like elastic body 7 can be unwound from the bobbin 70 with this tension.

  As shown in FIG. 3, the elastic body supply means 15 includes a feed roller 156 located on the downstream side of the feeding roller 152. The feed roller 156 is disposed between the rotating arm 14 and the feeding roller 152, and the rotation axis direction thereof is disposed in the x direction. The feed roller 156 has a servo motor (not shown) attached to its drive unit. The rotation speed of the servo motor (not shown), that is, the rotation speed of the feed roller 156 is controlled by a control unit (not shown) provided in the manufacturing apparatus 11A.

  In the manufacturing apparatus 11A, the integration unit 17 and the stretching unit 18 include a common pair of concave and convex rollers 171 and 172, as shown in FIGS. As the pair of concave and convex rollers 171, 172, metal or rubber cylindrical rollers can be used. In addition, if the uneven | corrugated rollers 171 and 172 are rubber rollers, it is effective in that there is an effect that it is possible to suppress slipping of the material during stretching. Examples of the rubber material include urethane and silicon. The pair of concavo-convex rollers 171 and 172 has a servo motor (not shown) attached to any one of the drive units, and the rotation speed is controlled by a control unit (not shown) included in the manufacturing apparatus 11A. Drive transmission gears are attached to the respective rotation shafts of the pair of concave and convex rollers 171 and 172. By this driving means (not shown), the rotation speed of a servo motor (not shown), that is, the rotation speed of one of the concave and convex rollers 171 and 172 can be controlled based on the production speed of the stretchable sheet. At this time, when the drive transmission gear is engaged, the driving force is transmitted to the other uneven rollers 172 and 171, and the pair of uneven rollers 171 and 172 can be rotated. A known lifting mechanism (not shown) for displacing one or both of the concave and convex rollers 171 and 172 in the z direction is attached to the bearing portion of the pair of concave and convex rollers 171 and 172. Can be adjusted.

  As shown in FIG. 4, the concave and convex rollers 171 and 172 are alternately formed with large diameter portions and small diameter portions. In the uneven roller 171 of the manufacturing apparatus 11A, large diameter portions 173 and small diameter portions 174 are alternately arranged in the x direction between nip portions 177 and 177, which will be described later, and the large diameter portion 173 and the small diameter portion 174 are respectively provided. As shown in FIG. 2, the concave-convex roller 171 is formed over one circumference. Similarly to the concavo-convex roller 171, the concavo-convex roller 172 of the manufacturing apparatus 11 </ b> A has large-diameter portions 175 and small-diameter portions 176 alternately formed in the x direction between nip portions 178 and 178 described later. Each of the small-diameter portions 176 is formed over the circumference of the uneven roller 172. The diameters of the large diameter portions 173 and 175 are larger than the diameters of the small diameter portions 174 and 176, and are larger than the diameters of nip portions 177 and 178 described later. Accordingly, the large diameter portions 173 and 175 are convex portions of the concave and convex rollers 171 and 172, and the small diameter portions 174 and 176 are concave portions of the concave and convex rollers 171 and 172. As shown in FIG. 4, the large diameter portion 173 of one uneven roller 171 is loosely inserted between the large diameter portions 175 and 175 of the other uneven roller 172, and the large diameter portion 175 of the other uneven roller 172 is Engage so as to be loosely inserted between the large-diameter portions 173 and 173 of the uneven roller 171, and the stretched thread-like elastic body is sandwiched between the pair of belt-like sheets 50 and 60 between the uneven rollers 171 and 172 in that state. The pair of belt-like sheets 50, 60 can be stretched while inserting the composite sheet and fixing the thread-like elastic body between the pair of belt-like sheets 50, 60.

  In a state in which one uneven roller 171 and the other uneven roller 172 mesh with each other, the pitch P (see FIG. 4) between the large diameter portion 173 of the uneven roller 171 and the large diameter portion 175 of the other uneven roller 172 is determined after construction. From the viewpoint of improving the touch of the stretchable sheet, the thickness is preferably 0.5 to 5 mm, and more preferably 1 to 3 mm. From the same viewpoint, the engagement depth Q (see FIG. 4) between the large diameter portion 173 of the uneven roller 171 and the large diameter portion 175 of the other uneven roller 172 is preferably 0.5 to 5.0 mm. More preferably, it is 1-3 mm.

  As shown in FIG. 2, the pair of concavo-convex rollers 171 and 172 includes an inner peripheral side of the transport belt 12 (upper transport belt 12a and lower transport belt 12b) and a transport belt 13 (upper transport belt 13a and lower transport belt 13b). It is located between the inner circumference side. As shown in FIGS. 2 and 4, the pair of concavo-convex rollers 171, 172 is a nip portion that prevents the belt-like sheets 50, 60 from contracting in the width direction at both ends in the x direction in the manufacturing apparatus 11 </ b> A. 177, 178. As shown in FIG. 4, the nip portions 177 and 178 are formed in the state where the large-diameter portion 173 of one uneven roller 171 and the large-diameter portion 175 of the other uneven roller 172 are engaged with each other as described above. It is formed smoothly so as to press the end of 60 in the x direction. From the viewpoint of pressing the end portions of the belt-like sheets 50 and 60, the width of the nip portions 177 and 178 is preferably 5 to 50 mm. Between the nip portion 177 of one uneven roller 171 and the nip portion 178 of the other uneven roller 172, the end portions in the x direction of the belt sheets 50, 60 are pressed, so that the width of the belt sheets 50, 60 in the width direction is reduced. The pair of belt-like sheets 50 and 60 can be stretched while preventing shrinkage. In the manufacturing apparatus 11A, the peripheral surfaces of the nip portions 177 and 178 are formed smoothly. However, in order to further prevent the belt-like sheets 50 and 60 from shrinking in the x direction and further preventing side slip, The peripheral surface of 178 may be subjected to anti-slip processing such as thermal spraying.

  As shown in FIG. 2, the cutting means 19 includes a cutter 190 having a sharp cutting blade where the conveyed elastic body 7 contacts. The cutter 190 is disposed by a support (not shown) at a position where the thread-like elastic body 7 hits, and the thread-like elastic body 7 is cut by being conveyed by the conveying belts 12 and 13 and being pressed against the cutter 190. . In the y direction, the cutting means 19 includes a pair of concave and convex rollers 171 and 172 and rollers 123 and 126 of the transport belt 12 (upper transport belt 12a and lower transport belt 12b) or transport belt 13 (upper transport belt 13a and lower transport). It is located between the rollers 133 and 136 of the belt 13b). The position in the x direction where the thread-like elastic body 7 is cut by the cutting means 19 may be between the concave and convex rollers 171 and 172 and the conveyor belts 12 and 13, or the inner and outer circumferences of the conveyor belts 12 and 13, respectively. May be between the outer peripheral portions of the conveyor belts 12 and 13. Moreover, as the cutting means 19, various known devices that can cut the thread-like elastic body 7 can be used without any particular limitation. For example, a cutter roller having a cutting blade extending in the circumferential direction on the outer peripheral surface and the cutting blade It is also possible to use a roller cutter or the like equipped with an anvil roller for receiving the same. It may be cut by laser or heat. In the manufacturing apparatus 11 </ b> A, suction portions (not shown) that suck unnecessary portions of the thread-like elastic body 7 cut by the cutter 190 are arranged on both outer sides in the x direction of the nip portion 178.

  Next, a method for manufacturing a stretchable sheet using the manufacturing apparatus 11A described above will be described.

  First, as shown in FIG. 3, the thread-like elastic body 7 is continuously fed out, and the fed-out thread-like elastic body 7 is introduced into the rotating arm 14 for winding the elastic body (supplying step). More specifically, the thread-like elastic body 7 is continuously fed out from the bobbin 70 of the thread-like elastic body 7 using the feeding roller 152. When unwinding, the rotational speed of the unwinding roller 152 is controlled by a control unit (not shown) of the manufacturing apparatus 11A based on the tension detection output of the thread-like elastic body 7 by the tension measuring device 153, and with a predetermined tension. The thread-like elastic body 7 is fed out from the bobbin 70.

  Next, the thread-like elastic body 7 is introduced into the rotating arm 14. At the time of introduction, the winding speed at which the thread-like elastic body 7 stretched to a predetermined stretching stress by the tensor 151 and the feeding roller 152 is wound around the pair of conveying belts 12 and 13 by the rotating arm 14. The feed roller 156 supplies the rotating arm 14 at the above speed. Here, the “winding speed” means one round of rotation around the outer peripheral side of the transport belt 12 (upper transport belt 12a, lower transport belt 12b) and the outer periphery of the transport belt 13 (upper transport belt 13a, lower transport belt 13b). It means a value obtained by dividing the length of the thread-like elastic body 7 by the time required for one round.

  Next, as shown in FIG. 2, the thread-like elastic body 7 is continuously wound around the pair of transport belts 12 and 13 using the rotating arm 14, and the thread-like elastic body 7 is transported by the pair of transport belts 12 and 13 ( Transport process). More specifically, the thread-like elastic body 7 supplied into the rotating arm 14 in the extended state is introduced into the arm portion 141 from the introduction port 145, passes through the shaft portion 142, the connecting portion 144, and the rotating portion 143. Derived from the outlet 146. The thread-like elastic body 7 led out from the lead-out port 146 is led out while the rotary arm 14 is rotated, so that the outer peripheral side at the upstream end of the transport belt 12 (upper transport belt 12a, lower transport belt 12b) and It is wound around the outer peripheral side at the upstream end of the transport belt 13 (upper transport belt 13a, lower transport belt 13b). Here, the conveyor belt 12 (upper conveyor belt 12a, lower conveyor belt 12b) and the conveyor belt 12 (upper conveyor belt 12a, lower conveyor belt 12b) are rotated by the rotational travel of the conveyor belt 12 (upper conveyor belt 12a, lower conveyor belt 12b). ) And the outer periphery of the conveyor belt 13 (upper conveyor belt 13a, lower conveyor belt 13b), the thread-like elastic body 7 is continuously wound in a spiral shape. The continuously wound thread-like elastic body 7 is conveyed between the pair of downstream belt-like sheets 50 and 60.

  Here, the thread-like elastic body 7 wound around the pair of conveying belts 12 and 13 extends in a direction intersecting with the y direction, and is not arranged in a direction orthogonal to the y direction. In order to correct the wound elastic body 7 in a direction (x direction) orthogonal to the y direction, for example, when the elastic thread 7 is wound as shown in FIG. 12, the rotational speed of the upper transport belt 12 a is made slower than the rotational speed of the lower transport belt 12 b, and the rotational speed of the lower transport belt 13 b is made slower than the rotational speed of the upper transport belt 13 a in the transport belt 13. Thus, the inclination of the thread-like elastic body 7 is gradually changed during the conveyance in the y-direction, and the inclination of the thread-like elastic body 7 is orthogonal to the y-direction before being conveyed between the pair of belt-like sheets 50 and 60 ( x direction).

  As shown in FIG. 2, the belt-like sheet 50 is previously folded at both ends in the x direction on the outer surface side by a sailor (not shown) or the like, and the conveyor belt 12 (upper conveyor belt 12a, lower conveyor belt 12b). ) And the conveying belt 13 (upper conveying belt 13a, lower conveying belt 13b) is supplied between the pair of concave and convex rollers 171 and 172 from the upper stage side. In addition, as shown in FIG. 2, the belt-like sheet 60 is previously folded at both ends in the x-direction by a sailor (not shown) or the like, and is conveyed to the conveyor belt 12 (upper conveyor belt 12a, lower conveyor). The belt 12b) and the conveyor belt 13 (the upper conveyor belt 13a and the lower conveyor belt 13b) are supplied between the pair of concave and convex rollers 171 and 172 from the lower side. In addition, before the strip | belt-shaped sheet 50 and / or the strip | belt-shaped sheet 60 are supplied between a pair of uneven | corrugated rollers 171,172, the adhesive agent is apply | coated to the inner surface side. The adhesive may be applied on the entire surface in a spiral shape or in a solid shape.

  Next, in this embodiment, before the cutting step described later, using the pair of concave and convex rollers 171 and 172 in which the large diameter portions 173 and 175 and the small diameter portions 174 and 176 are alternately formed, The pair of belt-like sheets 50 and 60 are stretched in a direction (x direction) perpendicular to the sheet conveying direction by being bitten by the concavo-convex portion 172 (stretching step). For example, when the stretching step is performed after the cutting step, from the viewpoint of improving the stretchability, it is necessary to re-stretch the sheet shrunk by cutting and apply the stretching. As described above, when the stretching step is performed before the cutting step, a re-expansion step is not necessary, and the stretching can be efficiently performed. Moreover, in this embodiment, the integration process and fixing process which fix the conveyed thread-like elastic body 7 between a pair of strip | belt-shaped sheets 50 and 60 are performed simultaneously using a pair of uneven | corrugated rollers 171, 172, and are conveyed. The formed elastic elastic body 7 is stretched while being fixed (integrated step) between the pair of belt-like sheets 50 and 60. More specifically, a concavo-convex roller 171 in which large-diameter portions 173 and small-diameter portions 174 are alternately formed from a continuous body in which continuously wound thread-like elastic bodies 7 are arranged between a pair of belt-like sheets 50 and 60. And the large-diameter portion 175 and the small-diameter portion 176 are alternately conveyed, and the large-diameter portion 173 of one concave-convex roller 171 and the small-diameter of the other concave-convex roller 172 are conveyed as shown in FIG. Between the portion 176 and between the small diameter portion 174 of one uneven roller 171 and the large diameter portion 177 of the other uneven roller 172, the thread-like elastic body 7 is fixed between the pair of belt-like sheets 50 and 60, Between the large-diameter portion 173 of the concave-convex roller 171 and the large-diameter portion 175 of the other concave-convex roller 172, the pair of belt-like sheets 50, 60 are placed in the x-direction over the entire y-direction. To Shin. As described above, since the integration process and the stretching process are performed using the common uneven rollers 171, 172, the equipment can be reduced in size and the equipment cost can be reduced. Further, when the integration process and the stretching process are performed at the same time, as in the case where the stretching process described above is performed before the cutting process, a re-expansion process is not necessary, and the stretching process can be efficiently performed.

  Moreover, in this embodiment, as shown in FIG. 4, a pair of concave-convex rollers 171 is used while preventing the pair of belt-like sheets 50, 60 from shrinking in the width direction by using means for preventing the belt-like sheets 50, 60 from shrinking. , 172, the pair of belt-like sheets 50, 60 are stretched. More specifically, the end portions in the x direction of the belt-like sheets 50 and 60 are pressed between the nip portions 177 and 178 provided at both ends in the x direction of the pair of uneven rollers 171 and 172, respectively. The pair of belt-like sheets 50 and 60 is stretched while preventing shrinkage in the x direction. Thus, since the pair of belt-like sheets 50 and 60 are stretched while preventing the belt-like sheets 50 and 60 from shrinking in the width direction, the stretchability of the produced stretchable sheet is further improved.

  Next, the thread-like elastic body 7 extending from both ends in the width direction (x direction) of the pair of belt-like sheets 50 and 60 is cut by the cutter 190 described above (cutting step).

Next, both ends in the x direction of the belt-like sheets 50 and 60 folded on the outer surface side are folded again by a sailor (not shown) or the like, and the thread-like elastic body 7 is placed between the pair of belt-like sheets 50 and 60 in the y direction. A belt-like stretchable sheet fixed in a stretched state in a direction intersecting with is continuously produced. Since the manufactured stretchable sheet is stretched in the x direction over the entire y direction, the flexibility of the stretchable sheet is improved. Specifically, the fibers constituting the belt-like sheets 50 and 60 in order to stretch the pair of belt-like sheets 50 and 60 in the x direction between the large-diameter portion 173 of the concave-convex roller 171 and the large-diameter portion 175 of the concave-convex roller 172. Since plastic deformation causes the fiber to be stretched and thinned, or the fibers and the joints between the fibers are broken to provide extensibility, the flexibility of the produced elastic sheet is improved.
In addition, the elastic sheet to be manufactured is formed into a hook shape due to the shrinkage of the thread-like elastic body 7, and in particular, is adhered to the inner surface of the belt-like sheet 50 and / or the belt-like sheet 60 in a stripe shape so as to extend in the y direction. If the agent is applied, the wrinkle shape becomes prominent, and the wrinkle shape becomes finer by being stretched by the uneven rollers 171, 172, resulting in a stretchable sheet having a very fine uneven pattern.

  In addition, since the produced elastic sheet is stretched in the x direction over the entire y direction, the stretch stop position in the x direction of the belt-like sheets 50 and 60 is extended, Improves. Specifically, as described above, in order to stretch the pair of belt-like sheets 50, 60 in the x direction between the large-diameter portion 173 of the uneven roller 171 and the large-diameter portion 175 of the uneven roller 172, Since the bonded state of the fibers constituting 60 is partially broken and the fibers are plastically deformed and extended, the stretchability of the produced stretchable sheet is improved.

  The manufactured belt-like stretchable sheet is intermittently cut in the x direction by a known cutting means (not shown). The interval of intermittent cutting is the same as the size of the waist panel 3 </ b> A included in the diaper 1. Thereby, a waist panel 3A (elastic sheet) as shown in FIG. 1 can be continuously produced. Since the waist panel 3A (stretchable sheet) manufactured in this way has improved stretchability, it will stretch with less material than before to demonstrate the same stretchability and stretchability as before, Material costs can be saved. Specifically, as described above, the waist panel 3A (stretchable) manufactured by stretching the pair of belt-like sheets 50 and 60 in the x direction between the large diameter portions 173 and 175 of the uneven rollers 171 and 172. Since the stretchability of the sheet is improved, the width of the waist panel 3A (stretchable sheet) in the stretch direction (X direction) can be narrowed, and the material cost can be reduced.

  As a manufacturing method of the diaper 1 provided with the waist panel 3A, a conveying direction (y direction) is performed between a continuous body of the top sheet 21, a continuous body of the back sheet 22, and a continuous body of both sheets 21 and 22 by a known method. Are provided with a plurality of elastic members 25 and a three-dimensional guard forming sheet which are intermittently provided with a plurality of absorbers 23, 23... And extended on both sides in the conveying direction (y direction) of the continuous body of the topsheet 21. A continuous body of the absorbent main body 2 in which 24 continuous bodies are arranged is manufactured in a separate process. A pair of waist panels 3A are included in the continuous body of the absorbent main body 2 so as to protrude outward in the x direction while transporting the manufactured continuous body of the absorbent main body 2 in the transport direction (y direction). The continuous body of the diaper 1 distribute | arranged for every absorber 33 to be manufactured is manufactured. Here, the conveyance direction (y direction) of the continuous body of the absorbent main body 2 and the conveyance direction (y direction) when manufacturing the waist panel 3A (elastic sheet) are the same direction, and the waist panel 3A (extension and contraction). There is no need to invert the adhesive sheet by 90 °. Then, the diaper 1 can be manufactured by cutting the continuous body into dimensions of individual diapers 1 by a known cutting means (not shown).

Hereinafter, the 2nd preferable embodiment of the manufacturing method of the elastic sheet of this invention is demonstrated, referring drawings for the case where the waist panel 3B (elastic sheet) of the diaper 1 is manufactured as an example.
About a waist panel 3B (elastic sheet), a different point from the waist panel 3A is demonstrated. The points that are not particularly described are the same as those of the waist panel 3A, and the description of the waist panel 3A is appropriately applied. In FIG. 5, the same parts as those in FIG.

  The waist panel 3B (stretchable sheet) manufactured in the second embodiment is different from the waist panel 3A that is stretched over the entire region in the Y direction, as shown in FIG. Only each of them is stretched in the X direction. That is, as shown in FIG. 5, the waist panel 3B has the extending | stretching process area | region 30B in each of the both ends of a Y direction. If it has the extending | stretching process area | region 30B in such a position, the edge part of the waist panel 3B which is easy to hit will become flexible, and a feeling of attachment will improve.

FIG. 6 schematically shows a manufacturing apparatus 11B suitably used in the method for manufacturing the waist panel 3B (elastic sheet) of the second embodiment.
About the manufacturing apparatus 11B of 2nd Embodiment, a different point from 11A of manufacturing apparatuses is demonstrated. The points that are not particularly described are the same as those of the manufacturing apparatus 11A, and the description of the manufacturing apparatus 11A is appropriately applied. In FIG. 6, the same parts as those in FIG.

  As shown in FIG. 6, in the manufacturing apparatus 11 </ b> B, as in the manufacturing apparatus 11 </ b> A, the integration unit 17 and the stretching unit 18 include a common pair of uneven rollers 171 and 172. In the uneven rollers 171 and 172 of the manufacturing apparatus 11B, the large diameter portions 173 and 175 are not formed over the entire circumference of the uneven rollers 171 and 172, but are formed in a part of the circumferential direction of the uneven rollers 171 and 172. Has been. The positions of the large-diameter portions 173 and 175 provided on the uneven rollers 171 and 172 are adjusted so that the large-diameter portions 173 and 175 correspond to each other, and the circumferential length of the uneven rollers 171 and 172 and the Y direction of the waist panel 3B It adjusts suitably according to the relationship with the length. For example, when the circumferential length of the concave and convex rollers 171 and 172 and the length in the Y direction of the waist panel 3B coincide with each other, a pair of large diameter portions 173 and 175 are provided on the concave and convex rollers 171 and 172, respectively. When the circumferential length of the uneven rollers 171 and 172 is twice the length of the waist panel 3B in the Y direction, two pairs of large diameter portions 173 and 175 are provided.

  Next, a method for manufacturing a stretchable sheet using the manufacturing apparatus 11B described above will be described. In the second embodiment, the description in detail regarding the first embodiment is appropriately applied to points that are not particularly described.

  First, as in the first embodiment, the thread-like elastic body 7 is continuously fed out, the fed-out thread-like elastic body 7 is introduced into the rotating arm 14 for winding the elastic body (supplying step), and then the rotating arm 14 Is used to continuously wind the thread-like elastic body 7 around the pair of transport belts 12 and 13 and transport the thread-like elastic body 7 by the pair of transport belts 12 and 13 (transport process). Next, before the cutting step, the pair of belt-like sheets 50, 60 are partially fixed while the conveyed elastic elastic body 7 is fixed between the pair of belt-like sheets 50, 60 using the pair of concave and convex rollers 171, 172. Stretch to. More specifically, a continuous body in which a continuously wound thread-like elastic body 7 is arranged between a pair of belt-like sheets 50 and 60, an uneven roller 171 having a large diameter portion 173 formed in part, and an uneven The pair of belt-like sheets 50 and 60 are partially stretched by being transported between the roller 171 and the concavo-convex roller 172 in which the large-diameter portion 175 is formed at a position corresponding to the large-diameter portion 173. That is, the said continuous body is conveyed between a pair of uneven | corrugated rollers 171 and 172, and a pair of strip | belt-shaped sheets 50 and 60 are extended | stretched to a x direction for every partial area | region of ay direction. Next, as in the first embodiment, the thread-like elastic body 7 extending from both ends in the width direction (x direction) of the pair of belt-like sheets 50 and 60 is cut with a cutter 190 (cutting step), and then the outer surface side The both ends of the belt-like sheets 50 and 60 folded in the x direction are folded again by a sailor (not shown) or the like, and the thread-like elastic body 7 intersects the y-direction between the pair of belt-like sheets 50 and 60 A belt-like stretchable sheet fixed in a stretched state is continuously produced.

The manufactured belt-like stretchable sheet is intermittently extended in the x direction so as to pass through an intermediate position of each of the partial regions subjected to stretching by a known cutting means (not shown). Disconnect. Thereby, a waist panel 3B (elastic sheet) as shown in FIG. 6 can be continuously produced.
In addition, by changing the cutting position of the manufactured belt-like stretchable sheet, for example, a stretched region can be provided in a portion of the waist panel 3B extending inward in the X direction from the fastening tape 8. When the stretched region is provided at such a position, even when the fastening tape 8 is pulled during or during mounting, the stretchability is high, so that the mounting feeling is improved.

  The manufacturing method of the elastic sheet of the present invention is not limited to the manufacturing methods of the first and second embodiments described above, and can be changed as appropriate.

  For example, in the manufacturing method of the first and second embodiments, the integration step and the stretching step are simultaneously performed using the pair of concave and convex rollers 171 and 172 before the cutting step. Separate from 172, after a pair of nip rollers are used for integration, a pair of concavo-convex rollers 171 and 172 may be used to perform a stretching process, followed by a cutting process.

  Further, in the manufacturing apparatuses 11A and 11B used in the manufacturing methods of the first and second embodiments, the nip portions 177 that prevent the belt-like sheets 50 and 60 from shrinking at both ends in the x direction of the uneven rollers 171 and 172, respectively. 178, but not necessarily. As a means for preventing shrinkage of the belt-like sheets 50, 60 when the nip portions 177, 178 are not provided, a suction conveyor that transports the belt-like sheets 50, 60 while sucking both ends in the x direction can be used. The suction conveyor is between the end portions of the concave and convex rollers 171 and 172 in the x direction and the inner peripheral side of the transport belt 12, and between the end portions of the concave and convex rollers 171 and 172 in the x direction and the inner peripheral side of the transport belt 13. It is preferable to distribute from the upstream side to the downstream side of the uneven rollers 171 and 172.

  Further, in the manufacturing apparatuses 11A and 11B used in the manufacturing methods of the first and second embodiments, the conveyed elastic elastic body 7 is interposed between the pair of belt-like sheets 50 and 60 using the pair of concave and convex rollers 171 and 172. However, the stretching step may be performed after the cutting step.

  Further, in the manufacturing apparatuses 11A and 11B used in the manufacturing methods of the first and second embodiments, a pair of concave and convex rollers 171 and 172 are used to make a direction (x direction) orthogonal to the sheet conveyance direction (y direction). The pair of belt-like sheets 50, 60 are stretched in the same direction, but the pair of belt-like sheets 50, 60 are stretched in an intersecting direction other than orthogonal using an uneven roller having a blade groove that is inclined obliquely with respect to the y direction. Alternatively, the pair of belt-like sheets 50 and 60 may be stretched in the y direction by using an uneven roller in which a blade groove is provided over the circumferential direction of the roller.

The elastic body winding means includes a disk having a thread-like elastic body introducing portion at the rotating shaft portion and an arm protruding downstream from the disk in the y direction. It is also possible to use one that wraps around the belt and winds the elastic thread around the conveyor belts 12 and 13. Further, as the feed roller 156, as shown in FIG. 2, instead of a material (thread-like elastic body) wound around and feeding the material, a feed roller 156 sandwiching the material with a nip roll may be used. it can.
In addition, instead of fixing a thread-like elastic body between the belt-like sheets, a belt-like sheet having a narrow width by folding back both ends in the width direction is introduced between the pair of concave and convex rollers 171, 172. Between the pair of concave and convex rollers 171, 172, a belt-like sheet that is not folded at both ends in the width direction may be introduced, and the thread-like elastic body may be fixed between the belt-like sheets.

  Further, as the conveyor belt, a conveyor belt as disclosed in WO 2005/060910 may be used instead of a pair of conveyor belts. In this case, only one conveyor belt may be used. Moreover, you may use the thread | yarn support member provided with the screw groove as described in FIGS. 4-6 of Unexamined-Japanese-Patent No. 2002-192641 as a longitudinal structure for thread | yarn conveyance.

  Moreover, the elastic sheet manufactured by the manufacturing method according to the first and second embodiments described above is not limited to the waist panels 3A and 3B of the unfolded disposable diaper 1 shown in FIG. It can also be used for a waist part of a pant-type disposable diaper, a pant-type sanitary napkin, a disposable underwear, an ear hook part of a disposable mask, a cleaning sheet, a bandage, and the like.

DESCRIPTION OF SYMBOLS 1 Unfoldable disposable diaper 2 Absorbent main body 21 Top sheet 22 Back sheet 23 Absorber 24 Solid guard forming sheet 25, 26 Elastic member 3A, 3B Waist panel 30A, 30B Stretching region 4 Panel material 5, 6 Sheet 50, 60 belt-like sheet 7 thread-like elastic body 70 bobbin 8 fastening tape 11A, 11B manufacturing apparatus 12 conveyor belt (16 conveyor means)
12a Upper conveyor belt 121, 122 pulley 12b Lower conveyor belt 124, 125 Pulley 13 conveyor belt (16 conveyor means)
13a Upper transport belt 131,132 Pulley 13b Lower transport belt 134,135 Pulley 14 Rotating arm 141, 142, 143 Guide 15 Elastic body supply means 151 Tensor 152 Feeding roller 153 Tension measuring device 156 Feed roller 17 Integration means (18 Extending means) )
171, 172 Uneven roller 173, 175 Large diameter part 174, 176 Small diameter part 177, 178 Nip part 19 Cutting means 190 Cutter A Abdominal side part, B Dorsal part, C Inseam

Claims (5)

A method for producing a stretchable sheet for continuously producing a stretchable sheet fixed in a state in which a thread-like elastic body is stretched in a direction intersecting the transport direction of the beltlike sheet between a pair of beltlike sheets,
A feeding step of continuously feeding out the thread-like elastic body and introducing the fed-out thread-like elastic body into an elastic body winding means; and a longitudinal structure for transferring the thread-like elastic body using the elastic body winding means. The thread-like elastic body is continuously wound around a body, and the wound elastic body is transported in the longitudinal direction of the longitudinal structure for thread transportation, and the conveyed thread-like elastic body is fixed between the belt-like sheets. An integration step, a stretching step of stretching the pair of belt-like sheets, and a cutting step of cutting the thread-like elastic body extending from both ends in the width direction of the pair of belt-like sheets,
As the pair of belt-like sheets, respectively, a sheet in which both ends in the width direction are folded,
The stretching step is performed at the same time as the integration step, and a pair of uneven elastic rollers in which large diameter portions and small diameter portions are alternately formed is used to fix the thread-like elastic body between the pair of belt-like sheets. The belt-shaped sheet of
Each of the pair of concavo-convex rollers has a nip portion for preventing contraction in the width direction of the pair of belt-like sheets at each of both end portions in the axial direction, and one of the concavo-convex rollers of the pair of concavo-convex rollers In the state where the large diameter portion and the large diameter portion of the other concave-convex roller mesh with each other, while pressing the folded end portion of the strip sheet in the width direction with the nip portion, in the width direction of the strip sheet The manufacturing method of the elastic sheet which prevents the shrinkage | contraction of this and performs the said extending process and the said integration process simultaneously.   2. The stretchable sheet according to claim 1, wherein the large-diameter portion of each of the pair of concave and convex rollers is formed in a part of the circumferential direction of the concave and convex roller, and partially extends the pair of belt-like sheets. Production method.   The stretching process according to claim 1 or 2, wherein the stretching step stretches the pair of belt-like sheets by the pair of concave and convex rollers while preventing the pair of belt-like sheets from shrinking using a means for preventing the belt-like sheet from shrinking. Manufacturing method of adhesive sheet.   The method for producing a stretchable sheet according to any one of claims 1 to 3, wherein the stretching step is performed before the cutting step. The method for producing a stretchable sheet according to any one of claims 1 to 4, wherein in the stretching step, the pair of belt-shaped sheets are stretched in a direction intersecting a sheet conveyance direction using the pair of concave and convex rollers. .

Images