JP2012120610A - Device for producing stretchable sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-durability device or the like for producing a stretchable sheet, correcting the direction of a filiform elastic body to be parallel in a plan view.SOLUTION: This device 11 for producing the stretchable sheet includes: an elastic body winding means 14 winding the filiform elastic body 7 around a pair of yarn-carrying long structures 12, 13 disposed in parallel to change the direction of the filiform elastic body 7 to a direction crossing the long direction of the yarn-carrying long structures 12, 13; and integration means 17 bonding the filiform elastic body 7 carried by the yarn-carrying long structures 12, 13 to belt-like sheets 50, 60 traveling in the long direction. The yarn-carrying long structure 12, 13 has: two parallel rotary pillar bodies 12a, 12b (13a, 13b) each having a rotational axis directed in the long direction; and a drive means rotationally driving the two rotary pillar bodies. By generating a velocity difference in a carriage velocity of the filiform elastic body 7 by the two rotary pillar bodies in the case of the rotation drive, the direction of the filiform elastic body 7 is corrected as approaching bonding parts with the belt-like sheets 50, 60.

Description

  The present invention relates to a stretchable sheet manufacturing apparatus.

  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, an adhesive is applied to a water-permeable sheet that is running in the length direction, and tension is applied to the adhesive-coated surface. A step of translating the thread-like elastic body along the sheet surface of the traveling sheet in a zigzag state toward the sheet traveling direction, and bonding the thread-like elastic body to the sheet in a stretched state; and the thread-like elasticity The manufacturing method of the elastic sheet which performs the process of cut | disconnecting a body at both ends is described.
Furthermore, in Patent Document 1, a pair of feed belts around which a thread-like elastic body is wound is provided with two upper and lower belts, and the thread-like elastic body in a zigzag state in plan view wound around a pair of conveying belts. An apparatus for manufacturing a stretchable sheet is also described in which a speed difference is provided between a columnar member and a columnar member, the plate is rearranged in parallel in plan view, and then fixed to a belt-like sheet.

However, in the apparatus using the upper and lower two-stage belt described in Patent Document 1, since the thread-like elastic body in a tensioned state is wound and used, the upper and lower two-stage belt is easily worn, The durability is poor. Generally, in order to achieve smooth integration of the thread-like elastic body and the belt-like sheet, etc., it is required to reduce the belt width of the upper and lower belts, and this durability becomes a problem.
Further, as disclosed in Patent Document 2, it is possible to use a ball screw or the like for conveying the thread-like elastic body. However, there has been no report on a technique for correcting the direction of the thread-like elastic body so that it is parallel to the plan view or the like in conveyance by a ball screw.

Japanese Unexamined Patent Publication No. 63-243309 JP 2002-192641 A

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

  The present invention provides a pair of longitudinal structures for yarn conveyance arranged in parallel at a predetermined interval, and a thread-like elastic body wound around the pair of longitudinal structures for yarn conveyance so that the direction of the filamentous elastic body is conveyed to the yarn. An elastic body winding means having a direction intersecting with a longitudinal direction of the longitudinal structure for use, and the thread-like elastic body wound around the elastic body winding means and conveyed by the longitudinal structure for yarn conveyance. The elastic sheet manufacturing apparatus includes an integration unit that adheres to a belt-like sheet traveling in a direction, wherein the longitudinal structure for yarn conveyance has two parallel axes each having a rotation axis directed in the longitudinal direction. A rotating column body, and a driving unit that rotationally drives the two rotating column bodies, and a speed difference between the rotational speed of the filamentous elastic body by the two rotating column bodies when the driving unit rotates. As you approach the point of adhesion with the strip sheet, Orientation of the thread-shaped elastic body is to be corrected, there is provided an apparatus for manufacturing a stretchable sheet.

Moreover, this invention provides the manufacturing method of the elastic sheet which manufactures an elastic sheet using the manufacturing apparatus of the said elastic sheet.
Further, the present invention is a method for manufacturing a disposable diaper having an absorbent main body and left and right waist panels provided on both left and right sides in the longitudinal direction of the absorbent main body, the manufacturing method for the stretchable sheet. The manufacturing method of a disposable diaper which comprises the process of manufacturing a stretchable sheet, and the process of manufacturing the said disposable diaper using this stretchable sheet for the formation material of the said waist panel is provided.

  According to the stretchable sheet manufacturing apparatus of the present invention, the direction of the thread-like elastic body can be corrected to be parallel to the plan view when the thread-like elastic body is conveyed to the bonding position with the belt-like sheet, and the durability of the apparatus is improved. Can do.

It is a top view which shows the waist panel material obtained by the manufacturing method of the elastic sheet which concerns on 1st Embodiment, and the manufacturing method of a disposable diaper, and a disposable diaper using the same. It is a schematic perspective view which shows the manufacturing apparatus of the elastic sheet which concerns on 1st Embodiment. It is a general | schematic center sectional drawing which shows arrangement | positioning etc. of each cylindrical member in 1st Embodiment. It is a schematic perspective view which shows the screw groove formed in the outer peripheral surface of a cylindrical member. It is a schematic perspective view which shows the process in which the direction of a thread-like elastic body is corrected while it is conveyed from a winding position to a fixed position. It is a perspective view which shows the structure of an upstream from the rotation arm (elastic body winding means) of the apparatus shown in FIG. It is a schematic side view which shows the drive mechanism of each cylindrical member which concerns on 2nd Embodiment. It is a schematic side view which shows the drive mechanism of each frustoconical columnar body which concerns on 3rd Embodiment. (A) is a perspective view, (b) is a sectional view. It is a schematic sectional drawing which shows the modification of arrangement | positioning of a rotating column. (A) shows a C-shaped arrangement, (b) shows an inverted C-shaped arrangement, and (c) shows a parallelogram arrangement.

(First embodiment)
Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.
Here, the elastic sheet manufactured with the manufacturing apparatus and manufacturing method of 1st Embodiment is used for the waist panel 3 of the deployment-type disposable diaper 1, for example, as shown in FIG. Therefore, first, the unfolded disposable diaper 1 will be described with reference to FIG. The disposable diaper 1 shown in FIG. 1 is also an example of the disposable diaper manufactured by each embodiment of the manufacturing method of the disposable diaper of this invention.

The deployable disposable diaper 1 (hereinafter also referred to as “diaper 1”) includes a ventral side A located on the abdomen side of the wearer, a back side B positioned on the back side, and a ventral side A when worn. It has an absorptive main body 2 having a crotch portion C positioned between the back side portion B and a pair of left and right waist panels 3, 3 connected to both the left and right outer sides of the back side portion B. 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 3 and 3 has a rectangular shape in a state of being expanded in a planar shape. Each waist panel 3 has two sheets 5, 6 and a plurality of thread-like elastic bodies 7 arranged between the two sheets 5, 6 in an extended state. Each waist panel 3 is made of a stretchable sheet that is fixed between a 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 extends in a direction (X direction) orthogonal 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. A fastening tape 8 is fixed to the rectangular waist panel 3 formed in this way at an end portion on the outer side in the X direction by means such as adhesive or fusion. The rectangular waist panel 3 is fixed to the back side B of the absorbent main body 2 by means such as adhesive or fusion, and the X side inward in the X direction. It is connected to the direction.

  In the present diaper 1, the stretchable sheet constituting the waist panel 3 is such that the sheet conveyance direction y at the time of manufacture is parallel to the Y direction, and the direction x perpendicular to the sheet conveyance direction at the time of manufacture coincides with the X direction. It is fixed to.

  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 3, 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, the stretchable sheet manufacturing apparatus 11 and the stretchable sheet manufacturing method according to the first embodiment will be described in detail with reference to FIGS.
The stretchable sheet manufacturing apparatus 11 according to the first embodiment includes a pair of parallel thread-conveying longitudinal structures 12 and 13 that are spaced apart from each other and extend in the longitudinal direction (y-direction), and a pair of the longitudinally-shaped longitudinal sheets 12 and 13. The thread-like elastic body 7 is wound around the structures 12 and 13 so that the direction of the thread-like elastic body 7 intersects the longitudinal direction (y direction), and the rotation arm 14 is wound around. The integrated means 17 for bonding the thread-like elastic body 7 that is rotated and conveyed by the longitudinal structures 12 and 13 to the belt-like sheets 50 and 60 that run along the longitudinal direction (y-direction), and the belt-like sheets 50 and 60 Cutting means 18 for cutting the thread-like elastic body 7 extending from both ends in the width direction.

As shown in FIG. 2, the longitudinal direction of the pair of longitudinal structures 12 and 13 is the same y direction as the sheet conveying direction. Further, the direction in which the pair of longitudinal structures 12 and 13 are separated from each other is a direction (x direction) orthogonal to the longitudinal direction (y direction).
The conveying direction (y direction) of the sheet is the conveying direction of the thread-like elastic body 7 wound around the pair of longitudinal structures 12 and 13 or the sheet when the thread-like elastic body 7 is fixed (the belt-like sheet 50 and / or 60).
The y direction of the arrow in FIG. 2 is the conveyance direction of the sheet, indicates the conveyance direction of the thread-like elastic body 7 and the pair of belt-like sheets 50, 60, and finally the conveyance direction of the waist panel manufactured according to the present embodiment and It is the same direction as the conveyance direction of the continuous body of the diaper 1 to which the waist panel (elastic sheet) is attached. 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. Further, the integration unit 17 uses the pair of nip rollers 171 and 172 to bond and fix the elongated thread-like elastic body 7 between the pair of belt-like sheets 50 and 60, but the z direction of the arrow in FIG. Is a direction in which the pair of nip rollers 171 and 172 face each other.
P1 in FIG. 2 indicates a winding position where the thread-like elastic body 7 is wound around the longitudinal structures 12 and 13 by the rotating arm 14. P2 in FIG. 2 indicates a fixing position where the thread-like elastic body 7 is bonded and fixed to the belt-like sheets 50 and 60 by the pair of nip rollers 171 and 172 described above.

As shown in FIG. 2, one longitudinal structure 12 includes two cylindrical members 12a and 12b that are parallel to each other. Similarly, the other longitudinal structure 13 includes two cylindrical members 13a and 13b that are parallel to each other. The rotation axis s1 (see FIG. 3) of the columnar member 12a and the rotation axis s2 (see FIG. 3) of the columnar member 12b face the longitudinal direction (y direction) of the longitudinal structure 12, and the rotation axis s1 and the rotation axis s2 Is substantially parallel. The rotation axis s3 (see FIG. 3) of the columnar member 13b and the rotation axis s4 (see FIG. 3) of the columnar member 13b are oriented in the longitudinal direction (y direction) of the longitudinal structure 13, and the rotation axis s3 and the rotation axis s4 Are substantially parallel.
The columnar members 12a, 12b, 13a, and 13b are columnar rotating columns in the present embodiment.
As shown in FIG. 3, the two cylindrical members 12 a and 12 b related to the longitudinal structure 12 are arranged in two vertical stages in the vertical direction (z direction) through a gap. The same applies to the two columnar members 13a and 13b related to the longitudinal structure 13. The circular diameters of the cross sections of the four cylindrical members 12a, 12b, 13a, and 13b are substantially the same.

As shown in FIG. 4, screw grooves 121, 122, 123, and 124 are formed on the outer peripheral surfaces of the four cylindrical members 12 a, 12 b, 13 a, and 13 b over the entire length of each cylindrical member. The thread grooves 121, 122, 123, and 124 all have the same pitch u in the axial direction (y direction).
It has a spiral shape in the same direction formed at the same depth. Moreover, the material of each cylindrical member 12a, 12b, 13a, 13b is desirably one that can withstand a high load, and examples thereof include metals and plastics, but are not limited thereto. A general-purpose metal ball screw can be used as the cylindrical member.

  Here, the four cylindrical members 12a, 12b, 13a, and 13b are driven by four direct drive motors (all not shown) corresponding to the respective cylindrical members 12a, 12b, 13a, and 13b. These are directly connected to the corresponding cylindrical members 12a, 12b, 13a, 13b. This eliminates the need for interlocking parts such as a belt and enables more precise drive control. Four motors (not shown) can be constituted by servo motors or the like.

  As shown in FIG. 2, the lengths of the four cylindrical members 12a, 12b, 13a, and 13b are substantially equal, and are substantially in the same position in the transport direction (y direction). The upstream ends of the four columnar members 12 a, 12 b, 13 a, 13 b in the transport direction are located upstream of the outlet 146 of the rotating arm 14. The four cylindrical members 12a, 12b, 13a, 13b are arranged from the upstream side to the downstream side of the pair of nip rollers 171, 172. The longitudinal structure 12 (the pair of upper and lower columnar members 12a and 12b) and the longitudinal structure 13 (the pair of upper and lower columnar members 13a and 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 thread-like elastic bodies 7 wound around the pair of longitudinal structures 12 and 13 by the rotating arm 14 are engaged with the respective thread grooves 121, 122, 123, and 124 of the respective columnar members. As the motor corresponding to each of the four cylindrical members 12a, 12b, 13a, 13b is driven to rotate, the cylindrical members 12a, 12b, 13a, 13b move in the same direction (the spiral progression of the screw grooves 121, 122, 123, 124). ) In the transport direction (y direction). The moving speed in the y direction of the thread-like elastic body 7 in contact with the outer peripheral surfaces of the four columnar members 12a, 12b, 13a, 13b is the conveyance speed of the thread-like elastic body 7 by the cylinder members 12a, 12b, 13a, 13b (hereinafter referred to as yarn). (Abbreviated as “conveying speed”).

Here, each cylindrical member 12a, so as to produce a speed difference in the yarn conveying speed between the pair of upper and lower cylindrical members (between the cylindrical member 12a and the cylindrical member 12b and between the cylindrical member 13a and the cylindrical member 13b). The rotational speeds 12b, 13a, and 13b are set. Here, the magnitude relationship between the yarn conveying speed of the upper cylindrical member 12a of the longitudinal structure 12 and the yarn conveying speed of the lower cylindrical member 12b is related to the yarn conveying speed 13a of the upper cylindrical member 13a of the other longitudinal structure 13. And the magnitude relation between the yarn conveyance speed of the lower cylindrical member 13b.
3 and 5, for example, in the longitudinal structure 12 (the right side of FIG. 3, the front side of FIG. 5), the yarn conveyance speed by the upper columnar member 12 a is made faster than that of the lower columnar member 12 b. In the longitudinal structure 13 (the left side in FIG. 3, the back side in FIG. 5), the yarn conveyance speed by the lower cylindrical member 13b is made faster than that of the upper cylindrical member 13a. This is because the inclination between the longitudinal structure 12 and the longitudinal structure 13 of the thread-like elastic body 7 is orthogonal to the y direction during conveyance in the y direction, as will be described later (FIG. 5). reference).

Desirably, among the four cylindrical members 12a, 12b, 13a, and 13b, the cylindrical members that increase the yarn conveyance speed (the cylindrical member 12a on the upper right side and the cylindrical member 13b on the lower left side in FIG. 3 in the above example) have the following theory. The rotation speed is controlled so that the yarn conveyance speed becomes Va according to Equation 1, and the cylindrical members that slow down the yarn conveyance speed (in the above example, the lower right cylinder member 12b and the upper left cylinder in FIG. 3). The rotation speed of each member 13a) is controlled according to the following theoretical formula 2 so that the yarn conveyance speed becomes Vb. In the following two formulas, L is the distance from the winding position P1 to the fixed position P2 of the thread-like elastic body 7 (see FIG. 5). In addition, p is the distance between the thread-like elastic bodies when finally in the parallel state (see FIG. 5), and V _O is the reference speed.
Va = (L + p / 2) / L × V _O ... (Formula 1)
Vb = (L−p / 2) / L × V _O ... (Formula 2)

  Since each of the cylindrical members 12a, 12b, 13a, and 13b is driven by a corresponding another motor (all not shown), the yarn conveyance speed between the cylindrical member 12a and the cylindrical member 12b according to the longitudinal structure 12 The difference can be realized by differentiating the rotational speeds of the motors that rotationally drive each of them. The yarn conveyance speed difference between the columnar member 13a and the columnar member 13b in the longitudinal structure 13 is also the same.

  Further, as shown in FIG. 2, the rotary arm 14 is an arm portion 141 having a shaft portion 142, a revolving portion 143, and a connecting portion 144, and a drive for rotating the arm portion 141 around the center line of the shaft portion 142 as a rotation axis. And a mechanism 147. 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.

As described above, in the circulating portion 143, the position of the outlet port 146 is located downstream from the upstream end of the longitudinal structure 12 (column members 12a and 12b) and the longitudinal structure 13 (column members 13a and 13b). It is arranged. The rotating arm 14 has a servo motor 148 attached to its drive part (shaft part 142), and the rotating part 142 becomes a longitudinal structure 12 (cylindrical members 12a and 12b) and a longitudinal structure by the rotation of the servo motor 148. The body 13 (cylindrical members 13a and 13b) goes around the outer periphery. The diameter of the locus along which the outlet 146 rotates is larger than the distance between the outer surfaces of the pair of longitudinal structures 12 and 13.
The thread-like elastic body 7 taken in by such a rotating arm 14 is an upstream end of the longitudinal structure 12 (cylindrical members 12a and 12b) and the longitudinal structure 13 (cylindrical members 13a and 13b) and is respectively It can wind continuously on the 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) included in the manufacturing apparatus 11.

As shown in FIG. 6, the elastic sheet manufacturing apparatus 11 continuously feeds the elastic thread 7 and supplies the elastic body 7 in an extended state to the rotating arm 14 (elastic winding means). Means 15 are provided.
The elastic body supply means 15 is located on the downstream side of the bobbin 70 around which the thread-like elastic body 7 is wound, and a tensioner 151 for applying tension to the thread-like elastic body 7 by a brake, and located on the downstream side of the tensor 151 and thread-like from the bobbin 70. A feeding roller 152 that feeds out the elastic body 7 and a tension measuring device 153 that is positioned downstream of the feeding roller 152 and measures the tension 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 twice around the outer periphery thereof. A control unit (not shown) provided in the manufacturing apparatus 11 controls the rotational speed of a servo motor (not shown), that is, the rotational speed of the feeding roller 152, based on the detection output from the tension measuring device 153. The body 7 can be unwound from the bobbin 70.

  As shown in FIG. 6, 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 11.

  Moreover, the integration means 17 is provided with a pair of nip rollers 171 and 172 as shown in FIG. As the pair of nip rollers 171, 172, a metal cylindrical roller or a cylindrical roller made of low hardness silicon rubber can be used. The pair of nip rollers 171 and 172 has a servo motor (not shown) attached to one of the drive units, and the rotation speed is controlled by a control unit (not shown) included in the manufacturing apparatus 11. Drive transmission gears are attached to the rotation shafts of the pair of nip rollers 171 and 172, respectively. By this driving means (not shown), the rotation speed of a servo motor (not shown), that is, the rotation speed of one of the nip 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 nip rollers 172 and 171, and the pair of nip rollers 171 and 172 can be rotated. The bearing portions of the pair of nip rollers 171 and 172 use a force such as hydraulic pressure, pneumatic pressure, or spring in order to securely fix the elongated elastic body between the pair of belt-like sheets 50 and 60, Each bearing part is pressurized.

  Although not shown, the pair of nip rollers 171 and 172 are located between the longitudinal structures 12 and 13 in plan view. The integration unit 17 includes an adhesive coating machine (not shown) that applies an adhesive to the belt-like sheets 50 and / or 60 before joining with the thread-like elastic body 7. The adhesive dispenser applies the adhesive in an arbitrary application pattern to the surface of the belt-like sheet 50 that faces the belt-like sheet 60 side and / or the surface of the belt-like sheet 60 that faces the belt-like sheet 50 side. The application mode of the adhesive may be a pattern coating such as a stripe shape, a spiral shape or a sine wave shape, or may be sprayed over the entire surface or applied in a solid coating shape. By applying an adhesive to the belt-like sheets 50 and / or 60 and sandwiching the thread-like elastic body 7 between the belt-like sheets 50 and 60, and pressurizing them with the nip rollers 171, 172, the thread-like elastic body 7 becomes a belt-like. It is securely fixed between the sheets 50 and 60.

  As shown in FIG. 2, the cutting means 18 includes a cutter 180 having a sharp cutting blade at a portion that is contacted by the conveyed elastic elastic body 7 (the cutter 180 on the longitudinal structure 13 side is not shown). . The cutter 180 is disposed at a position where the thread-like elastic body 7 hits by a support body (not shown), and the thread-like elastic body 7 is cut by being conveyed by the longitudinal structures 12 and 13 and pressed against the cutter 180. The Each cutter 180 is located between the columnar member 12a and the columnar member 12b, and between the columnar member 13a and the columnar member 13b. The position in the x direction where the thread-like elastic body 7 is cut by the cutting means 18 may be between the nip rollers 171 and 172 and the longitudinal structures 12 and 13. As the cutting means 18, various known ones that can cut the thread-like elastic body 7 can be used without 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.

Then, the process of manufacturing an elastic sheet using the manufacturing apparatus 11 demonstrated above is demonstrated.
First, as shown in FIG. 6, the thread-like elastic body 7 is continuously fed out, and the fed-out thread-like elastic body 7 is introduced into a rotating arm 14 as an elastic body winding means in an expanded state.
More specifically, the thread-like elastic body 7 is continuously fed out from the bobbin 70 around which the thread-like elastic body 7 is wound using the feeding roller 152. When unwinding, the rotational speed of the unwinding roller 152 and the brake of the tensor 151 are adjusted by a control unit (not shown) of the manufacturing apparatus 11 based on the tension detection output of the thread-like elastic body 7 by the tension measuring device 153. The thread-like elastic body 7 is fed out from the bobbin 70 with a predetermined tension.

  Then, the thread-like elastic body 7 is introduced into the rotating arm 14. When the thread-like elastic body 7 is introduced, the speed of the thread-like elastic body 7 introduced into the rotating arm 14 (elastic body winding means) by the feed roller 156 described above. Is adjusted to a constant speed and introduced. The introduction speed is a speed according to the winding speed for winding the pair of long structures 12 and 13.

  Then, as shown in FIG. 2 and FIG. 6, the elongated elastic body 7 is continuously wound around the pair of longitudinal structures 12, 13 using the rotating arm 14, and the pair of longitudinal structures 12, 13 is The thread-like elastic body 7 continuously wound by using is conveyed between the pair of belt-like sheets 50 and 60. More specifically, the thread-like elastic body 7 supplied to the rotating arm 14 in the extended state is introduced into the arm portion 141 from the introduction port 145, and guided through the shaft portion 142, the connecting portion 144, and the rotating portion 143. Derived from 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 pair of longitudinal structures 12 and 13 (the columnar member 12a, the columnar member 12b, the columnar member 13a, and the columnar member 13b). ) On the outer peripheral side (winding position: P1) at the upstream end. Here, by the rotation of the cylindrical members 12a, 12b, 13a, and 13b, the thread-like elastic body 7 is continuously spirally wound around the outer peripheral sides of the cylindrical members 12a, 12b, 13a, and 13b. The continuously wound thread-like elastic body 7 is conveyed between a pair of downstream belt-like sheets 50 and 60 (fixed position: P2).

  As shown in FIG. 5, the thread-like elastic body 7 wound around the pair of longitudinal structures 12 and 13 by the rotating arm 14 initially extends in a direction intersecting the y direction, and in a direction orthogonal to the y direction. Not arranged. However, as shown in FIG. 5, in the longitudinal structure 12, the yarn conveying speed of the upper cylindrical member 12 a is larger than that of the lower cylindrical member 12 b, and in the longitudinal structure 13, the yarn conveying speed of the lower cylindrical member 13 b is the upper cylindrical member. By being larger than 13a, in each longitudinal structure 12, 13, the position of the thread-like elastic body in each of the upper and lower stages gradually shifts back and forth along the transport direction. The thread-like elastic body 7 that is in a zigzag state in plan view in the vicinity of the winding position (P1) is parallel to the longitudinal structures 12 and 13 in the plan view in the vicinity of the fixed position (P2) and substantially orthogonal to the y direction. It becomes.

  As shown in FIG. 2, the belt-like sheet 50 is previously non-opposed by a sailor (not shown) or the like, in which both side portions in the longitudinal direction (both ends in the x direction) are outer surfaces (surfaces that are not joined to the belt-like sheet 60). Between the pair of nip rollers 171 and 172 from the upper side of the longitudinal structure 12 (cylindrical member 12a, cylindrical member 12b) and the longitudinal structure 13 (cylindrical member 13a, cylindrical member 13b). Have been supplied. As shown in FIG. 2, the belt-like sheet 60 is preliminarily formed by a sailor (not shown) or the like on both sides in the longitudinal direction (both ends in the x direction). And is supplied between the pair of nip rollers 171 and 172 from the lower side of the longitudinal structure 12 (columnar member 12a, columnar member 12b) and the longitudinal structure 13 (columnar member 13a, columnar member 13b). Has been. In addition, before the strip | belt-shaped sheet 50 and / or the strip | belt-shaped sheet 60 are supplied between a pair of nip 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, the thread-like elastic body 7 is fixed in a stretched state between the pair of belt-like sheets 50 and 60 using the nip rollers 171 and 172. More specifically, a continuous body in which the continuously wound thread-like elastic body 7 is disposed between the pair of belt-like sheets 50 and 60 is supplied between the pair of nip rollers 171 and 172, and the pair of belt-like sheets 50. , 60 is fixed in a stretched state.

  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 180 described above.

  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. It is possible to continuously manufacture the belt-like stretchable sheet 3 </ b> A fixed in a state of being stretched in the direction intersecting with. The manufactured belt-like stretchable sheet is intermittently cut in the x direction by a known cutting means (not shown). The interval of intermittently cutting is the same as the size of the waist panel 3 provided in the diaper 1. Thereby, the waist panel 3 (elastic sheet) can be manufactured continuously.

In addition, in the manufacturing method of the diaper 1 provided with the waist panel 3, a conveyance direction (y) between the continuous body of the surface sheet 21, the continuous body of the back sheet 22, and the continuous body of both the sheets 21 and 22 by a well-known method. .. Are formed in a plurality of elastic members 25 and three-dimensional guards extending intermittently in the conveying direction (y direction) of the continuous body of the topsheet 21. The continuous body of the absorbent main body 2 in which the continuous body of the sheet 24 is arranged is manufactured in a separate process.
A pair of waist panels 3 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 3 (elastic sheet) are the same direction, and the waist panel 3 (extension and contraction). It is not necessary 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).

As described in detail so far, in the stretchable sheet manufacturing apparatus 11 and the stretchable sheet manufacturing method of the first embodiment, the longitudinal structural body 12 has a pair of columnar members 12a, 12b parallel to the y direction and In addition to having two motors for driving the cylindrical members 12a and 12b, the longitudinal structure 13 drives a pair of cylindrical members 13a and 13b parallel to the y direction and the cylindrical members 13a and 13b, respectively. Has two motors. Each cylindrical member 12a, 12b, 13a, 13b has a helical thread groove 121, 122, 123, 124, respectively. And when rotating by each motor, a difference in speed is generated between the upper and lower cylindrical members (between the cylindrical member 12a and the cylindrical member 12b, and between the cylindrical member 13a and the cylindrical member 13b). Based on the above, the direction of the thread-like elastic body 7 is corrected as it approaches the bonding position with the belt-like sheets 50 and 60.
Therefore, in the stretchable sheet manufacturing apparatus 11 and the stretchable sheet manufacturing method of the first embodiment, the thread-like elastic body 7 whose direction is reliably corrected can be bonded to the belt-like sheet 50, and at the same time, the longitudinal structure Since the bodies 12 and 13 can be configured by the cylindrical members 12a, 12b, 13a, and 13b and the longitudinal structures 12 and 13 can be configured to have high rigidity, the durability of the apparatus can be enhanced.

  Each cylindrical member 12a, 12b, 13a, 13b has a helical thread groove 121, 122, 123, 124. However, as will be described later, the above effect can be achieved even without a thread groove. Is possible. In this embodiment, since each cylindrical member 12a, 12b, 13a, 13b has the helical thread grooves 121, 122, 123, 124, the thread-like elastic body 7 can be conveyed more stably, and the thread-like elastic body 7 Can be corrected more reliably.

  In the longitudinal structure 12 (longitudinal structure 13), the two threaded cylindrical members 12a and 12b (two threaded cylindrical members 13a and 13b) are driven by different motors, respectively. The yarn conveyance speed of each cylindrical member can be controlled based on the rotation speed of the motor, and the degree of freedom for setting the interval and orientation of the thread-like elastic bodies can be increased. Further, since the yarn conveyance speed can be controlled with high accuracy, the direction of the filamentous elastic body can be reliably corrected.

  Hereinafter, in the description after the second embodiment, the same reference numerals are given to the same or equivalent components as those described in the first embodiment, and the description thereof will be omitted. Moreover, since the specific structure and manufacturing method of a diaper mentioned above are the same also after 2nd Embodiment, it abbreviate | omits.

(Second Embodiment)
Next, a stretchable sheet manufacturing apparatus and a stretchable sheet manufacturing method according to the second embodiment will be described with reference to FIG.
As shown in FIG. 7, in the second embodiment, in the longitudinal structure 12 on the right side of FIG. 2, a pair of upper and lower cylindrical members 12 a and 12 b are connected to one motor 221 by timing belts 251 and 252, respectively, and are driven to rotate. In addition, a pair of upper and lower cylindrical members 13a and 13b in the other longitudinal structure 13 are connected to one motor 222 by timing belts 253 and 254, respectively, and are driven to rotate. Then, the rotational speeds of the cylindrical member 12a and the cylindrical member 12b are made different by setting the gear ratio at which the cylindrical member 12a is connected to the motor 221 and the gear ratio at which the cylindrical member 12b is connected to the motor 221 to different values. Similarly, the rotational speeds of the cylindrical member 13a and the cylindrical member 13b are made different by setting the gear ratio at which the cylindrical member 13a is connected to the motor 222 and the gear ratio at which the cylindrical member 13b is connected to the motor 222 to different values. The motors 221 and 222 are constituted by servo motors or the like.

Specifically, as shown in FIG. 7, the interlocking shaft portion 241 and the interlocking shaft portion 242 having different diameters are provided coaxially on the upper and lower two-stage columnar members 12 a and 12 b related to the longitudinal structure 12. The interlocking shaft portion 241 and the interlocking shaft portion 242 are connected to the motor 221 via the corresponding timing belt 251 and timing belt 252, respectively. Therefore, the upper columnar member 12a connected to the motor 221 by the interlocking shaft portion 241 having a small diameter rotates faster than the lower columnar member 12b connected to the motor 221 by the interlocking shaft portion 242 having a large diameter.
On the other hand, in the upper and lower column members 13a and 13b according to the longitudinal structure 13, the diameter of the interlocking shaft portion 243 of the upper column member 13a is opposite to the interlocking shaft of the lower column member 13b. The lower cylindrical member 13b is larger than the portion 244 so as to rotate faster than the upper cylindrical member 13a.

  As described above, in the second embodiment, the above-described “upper cylindrical member 12a of the longitudinal structure 12 is caused by the difference in rotational speed caused by different connection gear ratios when the pair of upper and lower cylindrical members are connected to the motor. The relationship between the yarn conveying speed of the lower cylindrical member 12b and the yarn conveying speed of the lower cylindrical member 12b is the relationship between the yarn conveying speed 13a of the upper cylindrical member 13a of the other longitudinal structure 13 and the yarn conveying speed of the lower cylindrical member 13b. A state opposite to the magnitude relationship is realized, and the direction of the thread-like elastic body 7 being conveyed is corrected.

  Unlike FIG. 7, the diameters of the four interlocking shaft portions 241, 242, 243, and 244 may be larger than the respective diameters of the columnar members 12a, 12b, 13a, and 13b. In addition, as an aspect in which the upper and lower two-stage cylindrical members are connected to the corresponding motors with different gear ratios, instead of providing an interlocking shaft portion on the same axis as each cylindrical member as shown in FIG. It is also possible to provide two rotation shaft portions having different diameters on the same axis, and to connect the two rotation shaft portions having different diameters directly to the outer peripheral portion of the upper and lower two-stage cylindrical members by a timing belt.

  As described above, in the stretchable sheet manufacturing apparatus and the stretchable sheet manufacturing method according to the second embodiment, in the longitudinal structure 12, the pair of upper and lower cylindrical members 12 a and 12 b have different gear ratios for one motor 221. The speed difference of the yarn conveyance speed between the columnar member 12a and the columnar member 12b is realized based on the connection. The same applies to the longitudinal structure 13. Therefore, the effects according to the manufacturing apparatus of the first embodiment described above can be realized by reducing the number of motors, and the number of parts, space saving, and manufacturing cost can be reduced.

(Third embodiment)
Then, the manufacturing apparatus of the elastic sheet which concerns on 3rd Embodiment is demonstrated based on FIG.
As shown in FIG. 8A, in the stretchable sheet manufacturing apparatus and the stretchable sheet manufacturing method of the third embodiment, the longitudinal structure 12 has a pair of upper and lower truncated cone columns 112a and 112b parallel to each other. The longitudinal structure 13 has a pair of upper and lower truncated cone columns 113a and 113b which are parallel to each other. Here, that the pair of truncated cone-shaped columns are parallel to each other means that the rotation axes of the pair of truncated cone-shaped columns are parallel to each other. The rotation axis s101 of the truncated cone column 112a, the rotation axis s102 of the truncated cone column 112b, the rotation axis s103 of the truncated cone column 113a, and the rotation axis s104 of the truncated cone column 113b are all longitudinal structures 12. , 13 is parallel to the longitudinal direction (y direction). As shown in FIG. 8A, the truncated cone columns 112a and 112b are arranged in two vertical stages in the vertical direction (z direction), and the truncated cone columns 113a and 113b are the same.

Here, in the longitudinal structure 12, the two truncated cone columns 112 a and 112 b are arranged along the y direction and face in opposite directions. The truncated cone-shaped columns 113a and 113b in the longitudinal structure 13 are also arranged along the y direction and face in opposite directions. At the same time, the upper frustoconical columns of the longitudinal structures 12 and 13 (the frustoconical columnar body 112a and the frustoconical columnar body 113a), and the lower frustoconical columnar bodies (the frustoconical columnar bodies 112b and The frustoconical columns 113b) are also arranged to face in opposite directions.
Here, “the two truncated cone-shaped members face in opposite directions” means that the directions in which the truncated cone-shaped members are reduced in diameter are opposite to each other.
The four truncated cones 112a, 112b, 113a, 113b have substantially the same shape.

  Although not shown, each truncated cone-shaped column 112a, 112b, 113a, 113b is formed with a thread groove over its entire length. Each screw groove has a spiral shape, and the pitch gradually increases from the reduced diameter of the truncated cone-shaped member to the enlarged diameter direction or gradually increases from the reduced diameter to the enlarged diameter. Even if the pair of upper and lower frustoconical columnar bodies 112a and 112b and the pair of upper and lower frustoconical columnar bodies 113a and 113b face in opposite directions, the spirals of the respective thread grooves are arranged to face in the same direction. .

As shown in FIG. 8B, in the longitudinal structure 12, the truncated cone columns 112a and 112b have interlocking shaft portions 340 and 341 on the same axis, respectively. The two interlocking shaft portions 340 and 341 have the same diameter, and are connected to one motor 321 via timing belts 350 and 351, respectively. Since the truncated cone-shaped column 112a and the truncated cone-shaped column 112b are connected at the same gear ratio as the motor 321, they rotate at the same speed (reference rotation speed). In addition, since the truncated cone-shaped column bodies 113a and 113b according to the other longitudinal structure 13 also have the same drive mechanism as the longitudinal structure 13, the description thereof is omitted.
Note that the motor 321 and the two interlocking shaft portions 340 and 341 can be connected by a single timing belt in order to rotate the two truncated cone-shaped columns 112a and 112b at the same speed. In this case, the number of parts that need to be replaced can be reduced.

As shown in FIG. 8A, even if the rotational speeds of the two truncated cone-shaped columns 112a and 112b are the same, the upstream portion of the truncated cone-shaped column 112a in the conveying direction has a small diameter, and therefore the thread-like elastic body 7 in the circumferential direction is small. On the other hand, since the diameter of the upstream portion in the conveying direction of the truncated cone-shaped column 112b is large, the moving speed of the filamentous elastic body 7 in the circumferential direction is large. When the pitch of the thread groove of each truncated cone-shaped column is formed at a constant pitch from the reduced diameter of the truncated cone-shaped member to the enlarged diameter direction, the thread of the truncated cone-shaped column 112a is caused by the difference in moving speed in the circumferential direction. The conveyance speed can be made larger than that of the truncated cone column 112b. In addition, when the pitch of the thread groove of the truncated cone column is gradually increased from the reduced diameter to the expanded diameter, the yarn conveyance speed of the truncated cone column 112a and the truncated cone column 112b is increased. The difference is further larger than the movement speed difference in the circumferential direction.
Similarly, the yarn conveyance speed in the truncated cone-shaped column body 113a having a large diameter in the upstream portion in the conveyance direction can be made smaller than the yarn conveyance speed in the truncated cone-shaped column body 113b having a small diameter in the upstream portion in the conveyance direction.
In this way, using the shape of each truncated cone column 112a, 112b, 113a, 113b according to the above formulas 1 and 2, between the upper and lower truncated cone columns (the truncated cone columns 112a, 112b). And the frustum-shaped column bodies 113a and 113b), the direction of the thread-like elastic body 7 can be corrected in the third embodiment as in the first embodiment. Become.

  As described above, in the third embodiment, the longitudinal structural body 12 has a pair of truncated cone-shaped columns 112a and 112b whose diameter reducing directions are opposite to each other, and the truncated cone-shaped columns 112a and 112b. A speed difference is caused in the yarn conveyance speed between the two. The same applies to the longitudinal structure 13. Therefore, the two upper and lower truncated cone columns 112 a and 112 b can be driven by one motor 321. The same applies to the upper and lower truncated cone columns 112a and 112b. Therefore, in the elastic sheet manufacturing method of the third embodiment, the effects described in the first embodiment can be realized while reducing the number of motors, and the number of parts, space saving, and manufacturing cost can be reduced. Is possible. In addition, since the gear ratios of the truncated cone-shaped column body 112a and the truncated cone-shaped column body 112b in the longitudinal structure 12 when connected to the motor 321 can be made equal (the same applies to the longitudinal structure 13), the interlocking shaft portions 340 and 341 have the same gear ratio. The diameters can be made equal to reduce the manufacturing cost.

  Here, the manufacturing apparatus or manufacturing method of the elastic sheet of this invention is not restrict | limited to each embodiment mentioned above at all, and can be changed suitably.

  For example, in each embodiment, upper and lower two-stage columnar members (conical truncated columnar bodies) are arranged in the z direction (vertical method). For example, in the first embodiment, as shown in the cross-sectional view of FIG. 3, the rotation axes s1, s2, s3, and s4 of the four columnar members form a rectangle formed by straight lines in the x direction and the z direction. However, as shown in FIG. 9, the cylindrical members 12a and 12b (the pair of upper and lower cylindrical members 13a and 13b in the longitudinal structure 13) related to the longitudinal structure 12 are arranged in the vertical direction (z direction) instead of being aligned with the rotation axis s1. The position of the rotation axis s2 (or the position of the rotation axis s3 and the rotation axis s4) may be shifted in the x direction and may be obliquely juxtaposed with respect to the z direction (or the adhesive surface between the belt-like sheet and the thread-like elastic body).

For example, in FIG. 9A, the upper two cylindrical members 12a and 13a are located on the inner side of the lower two cylindrical members 12b and 13b with respect to the center position PC of the belt-like sheets 50 and 60 in the x direction. The rotation axes s1, s2, s3, and s4 form a square shape. On the other hand, in FIG. 9B, the upper two cylindrical members 12a and 13a are located on the outer side of the lower two cylindrical members 12b and 13b with respect to the center position PC, and the rotation shafts s1, s2, s3, s4. Forms a reverse letter C.
In FIG. 9C, the upper cylindrical member 12a is positioned outside the lower cylindrical member 12b with respect to the center position PC of the belt-like sheets 50, 60, while the upper cylindrical member 13a is the lower cylindrical member 13b. The rotation axes s1, s2, s3, and s4 form a substantially parallelogram. In this case, there is a difference between the tension of the thread-like elastic body 7 disposed between the upper two cylindrical members 12a and 13a and the tension of the thread-like elastic body 7 disposed between the lower two cylindrical members 12a and 13a. Does not occur, and the tension of the thread-like elastic body 7 being conveyed can be kept constant, which is preferable. The upper columnar member 12a may be positioned on the inner side of the lower columnar member 12b, while the upper columnar member 13a may form a parallelogram positioned on the outer side of the lower columnar member 13b.
If it does in this way, the height of the vertical structure (z direction) of the longitudinal structures 12 and 13 for yarn conveyance during conveyance can be controlled, and the belt-like sheet by the nip rollers 171 and 172 is caused by the value of the height being too large. 50 and 60 can be prevented from becoming an obstacle to integration.

  In the first embodiment, the four cylindrical members are directly driven by the corresponding motors, but may be driven via a timing belt as long as they are driven independently. In the third embodiment, the pair of upper and lower frustoconical columns are driven by one motor via a timing belt, but may be directly driven separately.

In the first embodiment and the second embodiment, the four cylindrical members 12a, 12b, 13a, and 13b have substantially the same cross-sectional diameter, and the screw grooves 121, 122, 123, and 124 have substantially the same shape. Even if they are not the same, the direction of the thread-like elastic body 7 can be corrected by adjusting the motor rotational speed of each motor or the gear ratio of each cylindrical member connected to the motor. .
In the third embodiment, the four truncated cones 112a, 112b, 113a, and 113b have substantially the same shape, but the truncated cones 112a, 112b, 113a, and 113b are directly connected to each other by separate motors. This is not necessary when driving.

In the first to third embodiments, a thread groove is formed in the rotating column body, but the thread groove is not necessarily required. For example, the surface of a rotating column body is coated with a high friction material (for example, a material such as silicon or urethane), and a thread-like elastic body wound around a pair of longitudinal structures is conveyed by friction resistance. May be. Further, instead of forming a screw groove on the surface of the rotating column body, a spiral convex portion may be formed.
In the first embodiment to the third embodiment, during the conveyance in the y direction, the thread-like elastic body 7 is arranged so that the inclination of the thread-like elastic body 7 disposed between the pair of longitudinal structures is orthogonal to the y-direction. 7 were arranged in parallel in plan view. However, “correcting the direction of the thread-like elastic body” means not only that the inclination of the thread-like elastic body is orthogonal to the y direction and arranged parallel to the plan view, but also that the thread-like elastic body 7 is crossed in the plan view. The direction of the thread-like elastic body when being fixed to the belt-like sheet is changed from the initial winding state by causing a difference in the yarn conveyance speed of the two rotating column bodies constituting one longitudinal structure. It only has to change.

Moreover, as an elastic body winding means, the thing etc. which are described in patent document 1 and Unexamined-Japanese-Patent No. 2010-22588 can also be used.
Further, instead of fixing a thread-like elastic body between the pair of nip rolls 170, 171 by introducing a band-like sheet having a narrow width by folding back both ends in the width direction to the respective outer surface sides. Between the nip rolls 170 and 171, a belt-like sheet whose both ends in the width direction are not folded back may be introduced, and the thread-like elastic body may be fixed between the belt-like sheets. In the case of folding, only the widthwise end of one sheet may be used, or only the end of one belt-like sheet may be used.

  In addition to the waist panel 3 of the disposable diaper 1, the stretchable sheet produced by the production method of the present invention includes a waist part of a developed or pant-type disposable diaper, a pant-type sanitary napkin, a disposable underwear, It can also be used for ear masks, cleaning sheets, bandages and the like of disposable masks.

  The description omitted in one embodiment described above and the requirements of only one embodiment can be applied to other embodiments as appropriate, and the requirements in each embodiment can be appropriately changed between the embodiments. Can be substituted.

DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Absorbent main body 21 Top sheet 22 Back sheet 23 Absorber 3 Waist panel 3A Stretch sheet 4 Panel material 7 Threaded elastic body 11 Stretch sheet manufacturing apparatus 12 Longitudinal structure (longitudinal structure for yarn conveyance)
12a, 12b Cylindrical member (rotating column)
112a, 112b frustoconical column (rotary column)
121, 122, 123, 124 Thread groove 13 Longitudinal structure (longitudinal structure for yarn conveyance)
13a, 13b Cylindrical member (rotating column)
113a, 113b Frustum-shaped column (rotary column)
14 Rotating arm (elastic body winding means)
15 Supply means 17 Integration means 171, 172 Nip roller 18 Cutting means 180 Cutter 50, 60 Strip sheets 221, 222, 321 Motor

Claims (8)

A pair of longitudinal structures for yarn conveyance arranged in parallel at a predetermined interval, and a thread-like elastic body wound around the pair of longitudinal structures for yarn conveyance so that the direction of the filamentous elastic body is the longitudinal structure for yarn conveyance An elastic body winding means that has a direction intersecting with the longitudinal direction of the elastic body, and the thread-like elastic body that is wound around the elastic body winding means and conveyed by the longitudinal structure for yarn conveyance travels in the longitudinal direction. An apparatus for producing an elastic sheet comprising an integrated means for bonding to a belt-like sheet,
The longitudinal structure for yarn conveyance has two parallel rotating column bodies each having a rotation axis directed in the longitudinal direction, and driving means for rotationally driving the two rotating column bodies. The rotational direction of the thread-like elastic body is corrected as it approaches the bonding position with the belt-like sheet by causing a speed difference in the conveying speed of the thread-like elastic body by the two rotating column bodies during the rotational drive by the means. An apparatus for manufacturing an elastic sheet.   The stretchable sheet manufacturing apparatus according to claim 1, wherein the rotating column has a spiral groove or a convex portion. Each of the rotating columns is cylindrical,
The stretchable sheet manufacturing apparatus according to claim 1 or 2, wherein the driving means is two motors that independently drive the two rotating columns. Each of the rotating columns is cylindrical,
3. The stretchable sheet manufacturing apparatus according to claim 1, wherein the driving unit is a single motor that is connected to the two rotating column bodies at different gear ratios. 4.   The rotating column body is in the shape of a truncated cone, and in each of the longitudinal structures for yarn conveyance, one rotating column body has a diameter that increases in the conveyance direction of the thread-like elastic body, and another one The apparatus for producing a stretchable sheet according to claim 1, wherein the diameter decreases as the thread-like elastic body is conveyed.   The stretchable sheet manufacturing apparatus according to any one of claims 1 to 5, wherein the two rotating column bodies are obliquely juxtaposed with respect to an adhesive surface on which the thread-like elastic body adheres to the belt-like sheet.   The manufacturing method of an elastic sheet which manufactures an elastic sheet using the manufacturing apparatus of the elastic sheet of any one of Claims 1-6. A method for producing a disposable diaper having an absorbent main body and left and right waist panels provided on both left and right sides in the longitudinal direction of the absorbent main body,
The process of manufacturing an elastic sheet with the manufacturing apparatus of the elastic sheet of any one of Claims 1-6, and manufacturing the said disposable diaper using this elastic sheet for the formation material of the said waist panel. The manufacturing method of a disposable diaper which comprises a process.

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