JP6190637B2 - Stretched film manufacturing method and manufacturing apparatus thereof - Google Patents

Description

  The present invention relates to a method for manufacturing a stretched film that stretches in the width direction while transporting the film in the transport direction and a manufacturing apparatus therefor.

  In the conventional stretched film manufacturing method, the film is stretched in the width direction by gripping both ends of the film with clips provided on the chain and driving the chain in the direction of expanding the film in the width direction along the guide rail. A so-called tenter type stretched film production method is known (Patent Document 1).

  However, in the tenter type stretched film manufacturing method, neck-in or perforation in which the width of the film is reduced in a part of the stretched film may occur, or stretching unevenness may occur in the stretched film. Then, in order to solve such a problem, the manufacturing method of a wire type stretched film is proposed (patent document 2).

  As shown in FIG. 12, the stretched film manufacturing apparatus 101 employing the wire-type stretched film manufacturing method includes an outer periphery of the stretching roller 102 and an outer periphery of the transport rollers 103A, 103B, and 103C that transport the wire 104. The film 110 is stretched in the width direction by driving the wire 104 in the direction of expanding the film 110 in the width direction with the film 110 interposed therebetween. In the section in which the film 110 is stretched, all of the side end portions of the film 110 are sandwiched by the wires 104, thereby suppressing the occurrence of neck-in and perforation in a part of the stretched film 110, and stretching unevenness hardly occurs in the stretched film 110. Become.

JP 2004-67804 A JP 2010-99889 A

  However, as a result of studies by the present inventors, in the stretched film manufacturing apparatus 101 disclosed in Patent Document 2, the film 110 is composed of the outer peripheral portion of the stretching roller 102 and the outer peripheral portions of the transport rollers 103A, 103B, and 103C. In particular, the stress is concentrated on the film 110 at the portion sandwiched between the outer peripheral portion of the stretching roller 102 and the outer peripheral portions of the transport rollers 103A and 103C disposed at both ends of the stretching section of the film 110. Cheap. For this reason, it is difficult to stretch the film 110 while applying a uniform force in the transport direction of the film 110 in the stretching section of the film 110.

  An object of the present invention is to provide a stretched film manufacturing method and a manufacturing apparatus capable of stretching a film while applying a uniform force in the film transport direction in a stretched section of the film that hardly causes stretch unevenness.

The present invention
A method for producing a stretched film that stretches in the width direction while transporting the film in the transport direction,
In each of a part of the annular groove portion formed so as to extend along the outer peripheral portion of each of the stretched disks that are spread in the width direction from each other toward the transport direction and that are arranged so as to face each other. An endless wire movable along an endless track is mounted so as to sandwich both end portions of the film, and a transport roller is disposed along the inner periphery of the endless track to transport the film in the transport direction. While stretching the film extending in the width direction,
The stretched disc provides a stretched film manufacturing method, which is disposed along the inner circumference of the endless track.

The present invention also provides:
An apparatus for producing a stretched film that stretches in the width direction while transporting the film in the transport direction,
Stretched disks each extending in the width direction toward the transport direction and spaced apart so as to face each other, each formed with an annular groove along the outer periphery,
Attached to each of a part of the groove portion of the stretching disk so as to sandwich both end portions of the film, and can move along an endless track so as to stretch in the width direction while transporting the film in the transport direction. Endless wire rods,
A conveying roller disposed along the inner circumference of the endless track,
The stretched disc provides a stretched film manufacturing apparatus disposed along the inner circumference of the endless track.

  According to the present invention, since the stretching disk is disposed along the inner periphery of the endless track, the film is not sandwiched between the outer periphery of the stretching disk and the outer periphery of the transport roller, and as a result, the stretching unevenness However, partial stress concentration on the film does not occur while using a wire that is effective in solving the problem. Therefore, it is possible to provide a stretched film manufacturing method and a manufacturing apparatus capable of stretching the film while suppressing the unevenness of stretching and applying a uniform force in the film transport direction in the stretching section of the film.

It is the side schematic diagram of one form of the manufacturing apparatus of the stretched film by this invention. It is a plane schematic diagram of the stretched film manufacturing apparatus of FIG. It is the side surface schematic when moving the 3rd conveyance roller of the stretched film manufacturing apparatus of FIG. 1 to the upper position. It is a plane schematic diagram when a 3rd conveyance roller of the stretched film manufacturing apparatus of FIG. 1 is moved to an upper position. It is a side schematic diagram when the 3rd conveyance roller of the stretched film manufacturing apparatus of FIG. 1 is moved to the uppermost position. It is the plane schematic when moving the 3rd conveyance roller of the stretched film manufacturing apparatus of FIG. 1 to the uppermost position. It is the side schematic diagram when the 3rd conveyance roller of the stretched film manufacturing apparatus of FIG. 1 is moved to the lowest position. It is a plane schematic diagram when a 3rd conveyance roller of the stretched film manufacturing apparatus of FIG. 1 is moved to the lowest position. It is a plane schematic diagram when the angle which the 1st extending | stretching disk and 2nd extending | stretching disk of the stretched film manufacturing apparatus of FIG. 1 face is made small. It is the side surface schematic of another embodiment of the stretched film manufacturing apparatus of this invention. FIG. 11 is a schematic side view when the second transport roller of the stretched film manufacturing apparatus of FIG. 10 is located further rearward and the first stretched disc and the second stretched disc are located further upward. It is the side surface schematic diagram of the conventional stretched film manufacturing apparatus.

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

  FIG. 1 is a schematic side view of a stretched film manufacturing apparatus 1A employing the stretched film manufacturing method of the present embodiment, and FIG. 2 is a schematic plan view of the stretched film manufacturing apparatus 1A.

  The stretched film manufacturing apparatus 1A shown in FIGS. 1 and 2 is a stretched film manufacturing apparatus that stretches in the width direction (TD) while transporting the film 10 in the transport direction (MD). The film 10 is, for example, a polytetrafluoroethylene (PTFE) film, a polyethylene terephthalate (PET) film, a polyimide (PI) film, or the like. In the stretched film manufacturing apparatus 1A, by stretching the film 10 in the width direction, it is possible to obtain a thinner film than before stretching or to obtain a porous film (porous film).

  The stretched film manufacturing apparatus 1A includes a supply roller 31, a first pressing roller 32, a first stretching disk 23A and a second stretching disk 23B, a first wire 24A and a second wire 24B, and first transport rollers 25A and 25B. The second transport rollers 26A and 26B, the third transport rollers 27A and 27B, the tension control device 29, the film cutting device 30, the second pressing roller 33, the delivery roller 34, and the third pressing roller 35. A take-up roller 36. 2 is a schematic view of the stretched film manufacturing apparatus 1A as viewed from the right side face in the transport direction. FIG. 2 shows the first stretch disk 23A, the first wire 24A, and the first transport roller 25A. The second transport roller 26A and the third transport roller 27A are not shown, but each configuration of the first stretching disk 23A, the first wire 24A, the first transport roller 25A, the second transport roller 26A, and the third transport roller 27A These are the same as the respective configurations of the second stretching disk 23B, the second wire 24B, the first transport roller 25B, the second transport roller 26B, and the third transport roller 27B, and the illustration thereof is omitted.

  The supply roller 31 is a member for feeding out the film 10 wound around the outer peripheral portion in the transport direction. The supply roller 31 rotates counterclockwise when viewed from the right side surface, and with this rotation, the film 10 is fed out from the lower portion of the supply roller 31 in the transport direction.

  The first pressing roller 32 is disposed on the front side in the transport direction of the supply roller 31. The first pressing roller 32 is a member that is disposed at a position in contact with the upper surface of the film 10 that is fed from the supply roller 31 and presses the film 10 downward. The first pressing roller 32 is configured to be movable in the vertical direction and fixed at an arbitrary position in the vertical direction. The lower end of the first pressing roller 32 is positioned below the upper ends of the first stretching disk 23A and the second stretching disk 23B, and applies tension to the film 10.

  The first stretching disk 23A and the second stretching disk 23B are members that stretch the film 10 in the width direction. The first stretching disk 23 </ b> A and the second stretching disk 23 </ b> B are disposed on the front side in the transport direction of the first pressing roller 32. The first stretching disk 23A and the second stretching disk 23B extend in the width direction toward the transport direction and are arranged at an interval so as to face each other. The first stretching disk 23A and the second stretching disk 23B are disk-shaped members, respectively, and are formed with annular first groove portions 28A and second groove portions 28B along the outer peripheral portion. A film is formed on a part of the first groove part 28A and the second groove part 28B, specifically, on a part of the first groove part 28A and the second groove part 28B located above the first extending disk 23A and the second extending disk 23B. The first wire 24A and the second wire 24B are attached so that both side end portions of 10 are sandwiched between the first groove portion 28A and the second groove portion 28B. In the section where both side ends of the film 10 are sandwiched between the first wire 24A and the second wire 24B (the stretching section of the film 10), the first wire 24A and the second wire 24B move, so that the film 10 The film is stretched in the width direction while being transported in the transport direction. The first stretching disk 23 </ b> A and the second stretching disk 23 </ b> B are arranged so that the surface direction of the disk coincides with the direction perpendicular to the surface of the film 10.

In the stretched film manufacturing apparatus 1A, the stretching ratio in the width direction of the film 10 can be adjusted by changing the positions of the first stretching disk 23A and the second stretching disk 23B. For example, in the stretched film manufacturing apparatus 1A, the stretching ratio in the width direction of the film 10 can be adjusted by changing the angle at which the first stretching disk 23A and the second stretching disk 23B face each other. The stretching ratio in the width direction of the film 10 is such that the first wire 24A at the front end portion (stretching end portion) in the transport direction with respect to the distance between the first wire 24A and the second wire 24B at the rear end portion (stretching start portion) in the transport direction. And the ratio of the distance between the second wire 24B. As shown in FIG. 9, the first stretching disk 23A and the second stretching disk 23B are centered on the point P so that the angle at which the first stretching disk 23A and the second stretching disk 23B face each other becomes smaller (θ ₉ <θ ₂ ). Is moved, the stretching ratio of the film 10 is decreased, and the length in the width direction of the stretched film 10 is decreased. The angle at which the first stretching disk 23A and the second stretching disk 23B face each other is adjusted by adjusting the first stretching disk 23A and the second stretching disk 23B, the first transport rollers 25A and 25B, the second transport rollers 26A and 26B, and the third transport roller. This is done by moving the unit containing 27A and 27B. In addition, the point P is an intersection of the straight line which connects a conveyance direction front end part and the back end part when it observes from the direction perpendicular | vertical to the surface of the film 10, as shown in figure.

  The first wire 24A and the second wire 24B are endless wires that are movable along an endless track so as to extend in the width direction while transporting the film 10 in the transport direction. The first wire 24A and the second wire 24B are metal wires. The first stretching disk 23A and the second stretching disk 23B, the first transport rollers 25A and 25B, the second transport rollers 26A and 26B, and the third transport rollers 27A and 27B are in the endless track of the first wire 24A and the second wire 24B. Arranged along the inner periphery, tension is applied to the first wire 24A and the second wire 24B. The first wire 24A and the second wire 24B are not limited to metal wires, and may be metal or resin chains.

  The first transport rollers 25A and 25B are disposed along the inner circumference of the endless track of the first wire 24A and the second wire 24B. The first transport rollers 25A and 25B are free rollers that are rotatably arranged. The first transport rollers 25A and 25B are disposed below the first stretching disk 23A and the second stretching disk 23B.

  The second transport rollers 26A and 26B are drive rollers disposed along the inner circumference of the endless track of the first wire 24A and the second wire 24B. The second transport rollers 26A and 26B are configured to be rotatable in a predetermined direction (clockwise direction when viewed from the right side surface) by a driving force of a power source (not shown). The second transport rollers 26A and 26B are also disposed below the first stretching disk 23A and the second stretching disk 23B. Further, a tension control device 29 is connected to the second transport rollers 26A and 26B, and the second transport rollers 26A and 26B can be moved in the front-rear direction by the tension control device 29 and at any position in the front-rear direction. It can be fixed. When the second transport rollers 26A and 26B are moved forward in the transport direction, the tension acting on the first wire 24A and the second wire 24B increases, and when the second transport rollers 26A and 26B are moved rearward in the transport direction, the first wire The tension acting on the 24A and the second wire 24B is reduced.

  The tension control device 29 has a telescopic arm fixed to the rotation shafts of the second transport rollers 26A and 26B, and extends and retracts the second transport rollers 26A and 26B in the front-rear direction. The tension acting on the first wire 24A and the second wire 24B is adjusted.

  The third transport rollers 27A and 27B are disposed along the inner circumference of the endless track of the first wire 24A and the second wire 24B. The third transport rollers 27A and 27B are disposed in front of the first stretching disk 23A and the second stretching disk 23B in the transport direction. The third transport rollers 27A and 27B are free rollers that are rotatably arranged. The third transport rollers 27A and 27B are movable in the vertical direction and can be fixed at arbitrary positions in the vertical direction. When the third transport rollers 27A and 27B are moved upward, the stretch ratio is decreased, and when the third transport rollers 27A and 27B are moved downward, the stretch ratio is increased.

  In the stretched film manufacturing apparatus 1A, the stretch ratio in the width direction of the film 10 can be adjusted also by changing the positions of the third transport rollers 27A and 27B. For example, in the stretched film manufacturing apparatus 1A, the stretching ratio in the width direction of the film 10 can be adjusted by moving the third transport rollers 27A and 27B in the vertical direction. As shown in FIGS. 3 and 4, when the third transport rollers 27A and 27B are moved to the upper position, the first wire 24A and the second wire 24B at the front end in the transport direction of the stretched section of the film 10 are disposed. Since the distance becomes smaller, the length in the width direction of the stretched film 10 becomes smaller. As shown in FIGS. 5 and 6, when the third transport rollers 27 </ b> A and 27 </ b> B are moved to the uppermost position, the distance between the first wire 24 </ b> A and the second wire 24 </ b> B at the front end of the stretching section of the film 10 is as follows. Since it becomes further smaller, the length in the width direction of the film 10 is further reduced. As shown in FIGS. 7 and 8, when the third transport rollers 27A and 27B are moved to the lowest position, the distance between the first wire 24A and the second wire 24B at the front end of the stretched section of the film 10 Increases, the length of the film 10 in the width direction increases.

  The method for adjusting the stretching ratio in the width direction of the film 10 by changing the position of the transport roller is not limited to the movement of the third transport rollers 27A and 27B. For example, unlike the stretched film manufacturing apparatus 1B shown in FIG. 10, the second transport rollers 26A and 26B are moved in the front-rear direction without providing the third transport rollers 27A and 27B, thereby stretching the film 10 in the width direction. The magnification may be adjusted. In FIG. 10, since the second transport rollers 26 </ b> A and 26 </ b> B are positioned forward, the distance between the first wire 24 </ b> A and the second wire 24 </ b> B at the front end portion of the stretching section of the film 10 is reduced. The length in the width direction becomes smaller. In addition, as shown in FIG. 11, you may make it adjust the draw ratio of the width direction of the film 10 by moving the 1st extending | stretching disk 23A and the 2nd extending | stretching disk 23B to an up-down direction. In FIG. 11, since the first stretching disk 23A and the second stretching disk 23B are positioned higher, the stretching section of the film 10 is expanded, and the length in the width direction of the stretched film 10 is increased.

  The second pressing roller 33 is disposed on the front side in the transport direction of the third transport rollers 27A and 27B. The 2nd press roller 33 is a member for arrange | positioning in the position which contacts the upper surface of the film 10 unwound from the 1st extending | stretching disk 23A and the 2nd extending | stretching disk 23B, and pressing the film 10 below. The second pressing roller 33 is configured to be movable in the vertical direction and fixed at an arbitrary position in the vertical direction. The lower end of the second pressing roller 33 is positioned below the upper end of the delivery roller 34 and applies tension to the film 10.

  The delivery roller 34 is a member for feeding out the film 10 fed from the first stretching disk 23A and the second stretching disk 23B in the transport direction. The delivery roller 34 rotates clockwise as viewed from the right side surface. Above the feed roller 34, a film cutting device 30 for cutting both end portions of the film 10 is disposed.

  The film cutting device 30 is a device for cutting both end portions of the film 10 so that the width of the film 10 becomes a predetermined length. The film cutting device 30 is a general-purpose rotary sheet cutter that cuts both end portions of the film 10 with two rotating cutters, for example.

  The third pressing roller 35 is disposed on the front side of the delivery roller 34 in the carry-out direction. The third pressing roller 35 is a member that is disposed at a position that comes into contact with the upper surface of the film 10 that is fed from the delivery roller 34 and presses the film 10 downward. The third pressing roller 35 is movable in the vertical direction and can be fixed at an arbitrary position in the vertical direction. The lower end of the third pressing roller 35 is positioned below the upper end of the take-up roller 36 and applies tension to the film 10.

  The take-up roller 36 is a member for taking up the film 10 fed from the feed roller 34 around the outer periphery. The winding roller 36 rotates clockwise as viewed from the right side surface. The film 10 is taken up from the upper part of the take-up roller 36.

  The stretched film manufacturing apparatus 1 </ b> A may be configured to adjust the stretching ratio in the transport direction of the film 10 by applying a predetermined tension in the transport direction of the film 10. For example, the conveyance speed of the film 10 between the supply roller 31 and the first stretching disk 23A and the second stretching disk 23B, and the film 10 between the first stretching disk 23A and the second stretching disk 23B and the take-up roller 36. You may make it adjust the draw ratio of the conveyance direction of the film 10 by varying the conveyance speed of this.

  The stretched film manufacturing apparatus 1 </ b> A is provided between the supply roller 31 and the first stretched disk 23 </ b> A and the second stretched disk 23 </ b> B and / or between the first stretched disk 23 </ b> A and the second stretched disk 23 </ b> B and the take-up roller 36. In addition, a heater for heating or drying the film 10 may be further included. Or you may arrange | position the stretched-film manufacturing apparatus 1A whole inside a drying furnace, for example.

  According to the above configuration of the present embodiment, the first stretching disk 23A and the second stretching disk 23B are disposed along the inner circumference of the endless track of the first wire 24A and the second wire 24B. The film 10 is not sandwiched between the outer periphery of the disk 23A and the second stretched disk 23B and the outer periphery of the first transport rollers 25A and 25B, the second transport rollers 26A and 26B, and the third transport rollers 27A and 27B. As a result, partial stress concentration on the film 10 does not occur while using the first wire 24A and the second wire 24B that are effective in eliminating the stretching unevenness. Therefore, it is possible to stretch the film 10 while applying a uniform force in the transport direction of the film 10 in the stretching section of the film 10 while suppressing stretching unevenness.

  According to the above configuration of the present embodiment, it is possible to carry out a magnification adjusting step of adjusting the stretching magnification in the width direction of the film by changing the position of the transport roller and / or the stretching disk. The film is stretched in the stretching step by the stretching ratio adjusted in the magnification adjusting step. Further, the above-described configuration of the present embodiment includes a magnification adjusting mechanism that adjusts the stretching ratio in the width direction of the film by changing the position of the transport roller and / or the stretching disk. Specifically, for this mechanism, for example, a known device that moves the position of the shaft that is the rotation center of the transport roller or the stretching disk can be used. Here, the change of the position of the conveying roller and / or the stretching disk can be performed not only by the parallel movement of the roller and the disk, but also by changing the direction (posture) (rotational movement) or a combination thereof.

  To 100 parts by weight of PTFE fine powder (Polyflon Fine Powder F106, manufactured by Daikin Industries), 20 parts by weight of hydrocarbon oil (Isopar M, manufactured by Esso Petroleum Co., Ltd.) is added as an extrusion aid. The sheet was obtained by extruding into a paste. The obtained sheet was passed between metal rolling rolls and rolled to a thickness of 400 μm to obtain a raw roll. The obtained rolled material was dried in a drying furnace at 170 ° C. to obtain a PTFE sheet (PTFE film). The obtained PTFE film was stretched at a stretch ratio of 1 time in the transport direction and 4.5 times in the width direction in the stretched film manufacturing apparatus 1A of the present embodiment, and stretched to 200 μm.

  The manufacturing method and manufacturing apparatus of the stretched film of this invention can be used conveniently for extending | stretching thin films, such as a PTFE film, PET film, and PI film. Moreover, the manufacturing method and its manufacturing apparatus of the stretched film of this invention can be used for the use similar to the manufacturing method and its manufacturing apparatus of the conventional stretched film.

1A, 1B Stretched film manufacturing apparatus 10, 110 Film 23A, 23B First and second stretched discs 24A, 24B First and second wires 25A, 25B First transport rollers 26A, 26B Second transport rollers 27A, 27B Third transport Rollers 28A, 28B First and second groove portions 29 Tension control device 30 Film cutting device 31 Supply roller 32, 33, 35 First to third pressing rollers 34 Sending roller 36 Winding roller

Claims (4)

A method for producing a stretched film that stretches in the width direction while transporting the film in the transport direction,
In each of a part of the annular groove portion formed so as to extend along the outer peripheral portion of each of the stretched disks that are spread in the width direction from each other toward the transport direction and that are arranged so as to face each other. An endless wire movable along an endless track is mounted so as to sandwich both end portions of the film, a third transport roller is disposed along the inner periphery of the endless track, and the film is moved in the transport direction. Stretching step of the film stretched in the width direction while conveying,
The stretching disk is disposed along the inner circumference of the endless track ,
By further changing the position of the third conveying roller, further comprising a magnification adjusting step of adjusting the stretching ratio in the width direction of the film;
The magnification adjusting step is a step of adjusting the stretching magnification in the width direction of the film by moving the third transport roller in the vertical direction in front of the transport direction of the first stretching disk, and the third transport roller When the roller is moved to the upper position, the distance between the wire rods mounted on each of the stretching disks at the front end in the transport direction of the stretching section of the film is reduced, and the length of the film in the width direction after stretching is reduced. A manufacturing method which is a process in which the length is reduced . A method for producing a stretched film that stretches in the width direction while transporting the film in the transport direction,
In each of a part of the annular groove portion formed so as to extend along the outer peripheral portion of each of the stretched disks that are spread in the width direction from each other toward the transport direction and that are arranged so as to face each other. An endless wire movable along an endless track is mounted so as to sandwich both end portions of the film, and a second transport roller is disposed along the inner periphery of the endless track, and the film is moved in the transport direction. Stretching step of the film stretched in the width direction while conveying,
The stretching disk is disposed along the inner circumference of the endless track,
Further comprising a magnification adjusting step of adjusting the stretching ratio in the width direction of the film by changing the position of the second conveying roller;
The magnification adjusting step is a step of adjusting the stretching magnification in the width direction of the film by moving the second transport roller in the front-rear direction of the transport direction below the stretching disk, and the second transport roller When the roller is positioned forward in the transport direction, the distance between the wire rods attached to each of the stretching disks at the front end in the transport direction of the stretching section of the film becomes smaller, and the film in the width direction of the stretched film becomes smaller. A manufacturing method, which is a process of decreasing the length. An apparatus for producing a stretched film that stretches in the width direction while transporting the film in the transport direction,
Stretched disks each extending in the width direction toward the transport direction and spaced apart so as to face each other, each formed with an annular groove along the outer periphery,
Attached to each of a part of the groove portion of the stretching disk so as to sandwich both end portions of the film, and can move along an endless track so as to stretch in the width direction while transporting the film in the transport direction. Endless wire rods,
A third conveying roller disposed along the inner circumference of the endless track,
The stretching disk is disposed along the inner circumference of the endless track ,
Further comprising a magnification adjusting mechanism for adjusting the stretching ratio in the width direction of the film by changing the position of the third conveying roller;
The third transport roller is disposed in front of the first stretching disk in the transport direction,
The manufacturing apparatus is configured to adjust the stretching ratio in the width direction of the film by moving the third transport roller in the up-down direction,
In the manufacturing apparatus, when the third transport roller is moved to the upper position, the distance between the wire rods attached to the respective stretching disks at the front end in the transport direction of the stretching section of the film is reduced and the film is stretched. The manufacturing apparatus comprised so that the length of the said width direction of the said film may become small . An apparatus for producing a stretched film that stretches in the width direction while transporting the film in the transport direction,
Stretched disks each extending in the width direction toward the transport direction and spaced apart so as to face each other, each formed with an annular groove along the outer periphery,
Attached to each of a part of the groove portion of the stretching disk so as to sandwich both end portions of the film, and can move along an endless track so as to stretch in the width direction while transporting the film in the transport direction. Endless wire rods,
A second transport roller disposed along the inner circumference of the endless track,
The stretching disk is disposed along the inner circumference of the endless track,
A magnification adjusting mechanism that adjusts the stretching ratio in the width direction of the film by changing the position of the second transport roller;
The second transport roller is disposed below the stretching disk,
The manufacturing apparatus is configured to adjust the stretching ratio in the width direction of the film by moving the second transport roller in the front-rear direction of the transport direction,
In the manufacturing apparatus, when the second transport roller is positioned forward in the transport direction, the distance between the wire rods attached to the stretching disks at the front end in the transport direction of the stretching section of the film is reduced. The manufacturing apparatus comprised so that the length of the said width direction of the said subsequent film may become small.

Images