JP7263136B2 - Stretching device - Google Patents

Description

The present invention relates to a drawing apparatus.

In the stretching apparatus, longitudinal stretching and transverse stretching can be carried out, and carrying out these in order is called a sequential biaxial stretching method, and carrying out them at once is called a simultaneous biaxial stretching method. Compared to the sequential stretching method, the simultaneous biaxial stretching method has advantages such as less scratching, a wider range of raw materials, the ability to stretch even if the crystallization speed is high, and high uniformity of physical properties in the vertical and horizontal directions. .

For example, Japanese Patent Application Laid-Open No. 2014-180779 (Patent Document 1) describes a technique related to a drawing machine.

JP 2014-180779 A

When manufacturing a thin film using a stretching apparatus, it is desired to suppress the manufacturing cost.

Other problems and novel features will become apparent from the description of the specification and the accompanying drawings.

According to one embodiment, the thermoplastic resin film stretching device includes a pair of link devices for conveying and stretching the thermoplastic resin film, and a central portion of the pair of link devices covering the thermoplastic resin film. and a heat treatment section for performing heat treatment on. Each of the pair of link devices includes a support base, an annular outer rail arranged on the support base in a plan view, and an inner side arranged on an inner peripheral side of the outer rail so as to face the outer rail. a rail, first positioning means for positioning the inner rail at a first rail position, and second positioning means for positioning the inner rail at a second rail position . By arranging the inner rail at the first rail position or the second rail position, the draw ratio of the thermoplastic resin film can be made variable.

According to one embodiment, it is possible to reduce manufacturing costs when manufacturing a thin film using a stretching device.

1 is a schematic diagram showing the configuration of a thin film manufacturing system according to an embodiment; FIG. FIG. 2 is a plan view showing the configuration of the stretching device shown in FIG. 1; FIG. 3 is a plan perspective view of the stretching device shown in FIG. 2; FIG. 4 is a plan view schematically showing the link and rails shown in FIG. 3; FIG. 4 is an enlarged plan view showing one of the plurality of links shown in FIG. 3; FIG. 6 is a cross-sectional view along line A1-A2 of the link shown in FIG. 5; 6 is a cross-sectional view along line A1-A3 of the link shown in FIG. 5; FIG. FIG. 3 is a plan view showing the arrangement positions of rails in the stretching device of one embodiment. FIG. 9 is a partially enlarged plan view showing an enlarged part of FIG. 8; FIG. 9 is a partially enlarged plan view showing an enlarged part of FIG. 8; FIG. 9 is a plan view showing the arrangement position of the rail when the arrangement position of the rail is changed from the state shown in FIG. 8; FIG. 12 is a partially enlarged plan view showing an enlarged part of FIG. 11; FIG. 12 is a partially enlarged plan view showing an enlarged part of FIG. 11; FIG. 12 is a cross-sectional view of the link in the case of FIG. 11; FIG. 10 is a plan view showing the arrangement positions of rails in the stretching device of the study example. FIG. 16 is a partially enlarged plan view showing an enlarged part of FIG. 15; FIG. 16 is a partially enlarged plan view showing an enlarged part of FIG. 15; FIG. 10 is a cross-sectional view of a link in the stretching device of the study example; FIG. 11 is a plan view showing the arrangement positions of rails in a stretching device of another embodiment; FIG. 20 is a partially enlarged plan view showing an enlarged part of FIG. 19; FIG. 20 is a partially enlarged plan view showing an enlarged part of FIG. 19; FIG. 11 is a plan view showing the arrangement positions of rails in a stretching device of another embodiment; FIG. 11 is a plan view showing the arrangement positions of rails in a stretching device of another embodiment;

Hereinafter, embodiments will be described in detail based on the drawings. In addition, in all the drawings for describing the embodiments, members having the same functions are denoted by the same reference numerals, and repeated description thereof will be omitted. Also, in the following embodiments, the description of the same or similar parts will not be repeated in principle unless particularly necessary.

(Embodiment 1)
<Regarding the overall configuration of the manufacturing system>
FIG. 1 is a schematic diagram showing the configuration of a thin film manufacturing system according to the present embodiment.

A thin film manufacturing system 1 of the present embodiment shown in FIG. An axial stretching device) 5 , a take-up device (take-up device) 6 , and a winding device (winder) 7 are provided.

Next, an outline of the operation of the thin film manufacturing system 1 will be described.

First, the raw material is supplied into the extrusion device 2 from the raw material supply portion (raw material inlet) 2 a of the extrusion device 2 . The raw material supplied to the extrusion device 2 consists of a resin material (thermoplastic resin material, pellets), additives, and the like. The extruding device 2 transports (conveys) the raw materials supplied to the extruding device 2 while kneading (mixing) them. For example, the raw material supplied into the extruder 2 is melted and kneaded while being sent forward by the rotation of the screw within the extruder 2 . The kneaded material (molten resin) kneaded in the extruder 2 is supplied to the T-die 3 , passes through the T-die 3 , and is extruded through the slit of the T-die 3 toward the raw fabric cooling device 4 . The kneaded material (molten resin) supplied from the extruder 2 to the T-die 3 passes through the T-die 3 and is formed into a predetermined cross-sectional shape (here, a film shape).

The kneaded product (molten resin) extruded from the T-die 3 is cooled in the original fabric cooling device 4 to form a film (sheet, resin film) 8 . The film 8 is a film in a solid state (solid state). More specifically, membrane 8 is a thermoplastic resin membrane. The membrane 8 is fed to the stretching device 5 . Since the molded kneaded material (molten resin) is continuously extruded from the T-die 3 , the film 8 is continuously supplied to the stretching device 5 .

The film 8 supplied (conveyed) from the raw fabric cooling device 4 to the stretching device 5 is stretched in the MD direction and the TD direction by the stretching device 5 . The film 8 that has been stretched (stretched) by the stretching device 5 is conveyed to the winding device 7 via the take-up device 6 and wound up by the winding device 7 . The film 8 wound on the winding device 7 is cut by a cutter (not shown) as required.

Thus, thin films can be manufactured using the thin film manufacturing system 1 . Note that the thin film manufacturing system 1 shown in FIG. 1 is merely an example, and various modifications are possible according to the characteristics of the thin film to be formed. For example, an extraction layer (not shown) may be provided near the take-up device 6 shown in FIG. 1, and the plasticizer (for example, paraffin) in the film 8 may be removed in an extraction tank.

The stretching device 5 in the present embodiment stretches the film 8 in the MD direction and the TD direction while transporting the film 8 in the MD direction. The MD (Machine Direction) direction is the transport direction of the film, and is also called the vertical direction. Also, the TD (Transverse Direction) direction is a direction crossing the transport direction of the film (here, the MD direction), and is also referred to as the lateral direction. The MD direction and the TD direction are directions that cross each other, and more specifically, directions that are orthogonal to each other. A stretching device 5 capable of simultaneously stretching a film in two mutually intersecting directions (here, MD and TD) is called a simultaneous biaxial stretching device.

<About stretching equipment>
Next, the stretching device 5 will be described. FIG. 2 is a plan view showing the configuration of the stretching device 5 shown in FIG. FIG. 3 is a perspective plan view of the stretching device 5, and in FIG. 2, the heat treatment section 19 is shown as seen through. FIG. 4 is a plan view schematically showing the link 11 and the rails 13 and 14 in the stretching device 5. FIG. (b) of FIG. 4 shows an area where the distance between the rails 13 and 14 is smaller than that of FIG. 4(a). FIG. 5 is an enlarged plan view showing one of the plurality of links 11 shown in FIG. 3 in an enlarged manner. 6 is a cross-sectional view of the link 11 shown in FIG. 5 along the line A1-A2, and FIG. 7 is a cross-sectional view of the link 11 shown in FIG. 5 along the line A1-A3.

As shown in FIGS. 2 and 3, the stretching device 5 has a pair of link devices 10 spaced apart from each other in plan view. Here, one of the pair of link devices 10 is called the link device 10R, and the other is called the link device 10L. 2 and 3, the link device 10R is arranged on the right side (R side) with respect to the transport direction (MD direction), and the link device 10L is arranged on the left side (L side) with respect to the transport direction (MD direction). are placed. The link device 10R and the link device 10L are spaced apart in the TD direction and face each other in the TD direction with the film 8 interposed therebetween. The membrane 8 is arranged between the linking device 10R and the linking device 10L and transported in the MD direction between the linking device 10R and the linking device 10L. A portion between the linking device 10R and the linking device 10L can function as a transport section for transporting the membrane 8. As shown in FIG.

Each link device 10 (10R, 10L) includes a plurality of links 11 connected to form an endless chain, a plurality of clips 12 respectively attached to the plurality of links 11, and movement of the plurality of links 11. It has a pair of rails 13 and 14 that serve as paths, sprockets 16, 17 and 18 that drive the plurality of links 11, and a support base 15 that supports the rails 13 and 14.

Here, the link 11 forming the link device 10R is called the link 11R, and the link 11 forming the link device 10L is called the link 11L. Also, the clip 12 forming the link device 10R is called a clip 12R, and the clip 12 forming the link device 10L is called a clip 12L. The rail 13 constituting the link device 10R is called a rail 13R, the rail 14 constituting the link device 10R is called a rail 14R, and the rail 13 constituting the link device 10L is called a rail 13L. The rail 14 will be referred to as rail 14L. The sprockets 16, 17 and 18 forming the link device 10R are called sprockets 16R, 17R and 18R, respectively, and the sprockets 16, 17 and 18 forming the link device 10L are called sprockets 16L, 17L and 18L, respectively. and Also, the support base 15 that constitutes the link device 10R will be referred to as a support base 15R, and the support base 15 that constitutes the link device 10L will be referred to as a support base 15L.

A clip 12R is attached to each of the plurality of links 11R that constitute the link device 10R, and a clip 12L is attached to each of the plurality of links 11L that constitute the link device 10L. The clip 12 (12R, 12L) is a member (jig) that grips and grips the membrane 8, and can be regarded as a gripping member or a grasping member. Membrane 8 is gripped by a plurality of clips 12R of linkage 10R and a plurality of clips 12L of linkage 10L. That is, one end of the film 8 (right end with respect to the conveying direction) is gripped by the plurality of clips 12R of the link device 10R, and the other end of the film 8 (left end with respect to the conveying direction) is gripped by the plurality of clips 12R. part) is gripped by a plurality of clips 12L of the link device 10L. From another point of view, the membrane 8 is gripped by a plurality of links 11R of the linking device 10R and a plurality of links 11L of the linking device 10L via clips 12 (12R, 12L).

A plurality of links 11R that constitute the link device 10R are connected to each other so as to form an endless chain, and the plurality of links 11R that are connected to each other can travel along the rails 13R and 14R. 13R and 14R. Similarly, the plurality of links 11L that constitute the link device 10L are connected to each other so as to form an endless chain, and the plurality of links 11L that are connected to each other can travel along the rails 13L and 14L. and are arranged on the rails 13L and 14L. The rail 13R and the rail 14R are paired and arranged in an annular shape, the rail 13R being arranged on the inner peripheral side and the rail 14R being arranged on the outer peripheral side. Similarly, the rail 13L and the rail 14L are paired and arranged in a ring, the rail 13L being arranged on the inner peripheral side and the rail 14L being arranged on the outer peripheral side. Therefore, the rail 13R is arranged on the inner peripheral side of the annular rail 14R so as to face the rail 14R in plan view, and the rail 13R is arranged on the inner peripheral side of the annular rail 14L so as to face the rail 14L in plan view. A rail 13L is arranged. The rails 13R and 13L may be called inner rails, and the rails 14R and 14L may be called outer rails.

The stretching device 5 has three regions 20A, 20B, and 20C in plan view. Region 20A is a preheating region (preheating region), region 20B is a stretching region, and region 20C is a heat setting region. In the transport direction (MD direction), the regions 20A, 20B, and 20C are arranged in order, the regions 20A and 20B are adjacent in the MD direction, the regions 20B and 20C are adjacent in the MD direction, and the regions 20B and 20C are adjacent in the MD direction. Directionally between regions 20A and 20C is region 20B. The inlet of the membrane 8 in the stretching device 5 (corresponding to the portion indicated as "IN" in FIGS. 2 and 3, hereinafter referred to as the "inlet") is located in the region 20A and is the inlet of the membrane 8 in the stretching device 5. An exit (corresponding to the portion indicated as "OUT" in FIGS. 2 and 3, hereinafter referred to as "exit") exists in region 20C. The direction from the entrance to the exit of the film 8 in the stretching device 5 corresponds to the transport direction (MD direction) of the film 8 .

The stretching device 5 further includes a heat treatment section (heat treatment device) 19 that covers the central portion of the pair of link devices 10R and 10L and performs heat treatment on the film 8. As shown in FIG. FIG. 2 shows an example using an oven as the heat treatment section 19 . A portion (central portion) of each of the link devices 10R and 10L is arranged in the chamber of the heat treatment section 19. As shown in FIG. The film 8 passes through the heat treatment section 19 while being held by the linking device 10R and the linking device 10L.

In the conveying direction (MD direction), the linking devices 10R and 10L are covered with the thermal processing section 19 only in part of the area 20A, the entire area 20B, and part of the area 20C. Therefore, the entire link devices 10R and 10L are covered with the heat treatment section 19 in the region 20B (stretching region). Since the film 8 is stretched in the TD and MD directions in the region 20B (the region covered by the heat treatment section 19), the film 8 is subjected to stretching treatment (in the TD and MD directions) while being heated (heat treated) in the heat treatment section 19. Stretching process) is performed. On the other hand, in the area 20A (preheating area), the linking devices 10R and 10L have an area covered with the heat treatment section 19 and an area not covered, near the inlet of the membrane 8 (where the sprockets 16 and 17 are arranged). ), the linking devices 10R and 10L are not covered with the heat treatment section 19. As shown in FIG. In the area 20C (thermal setting area), the linking devices 10R and 10L have areas covered with the heat treatment section 19 and areas not covered, near the outlet of the membrane 8 (where the sprocket 18 is arranged). ), the linking devices 10R and 10L are not covered with the heat treatment section 19. As shown in FIG. While the film 8 passes through the regions 20A, 20B, and 20C, the film 8 passes through the heat treatment section 19, so that the film 8 can be heated to a desired temperature. Therefore, the stretching treatment of the film 8 can be performed at a temperature suitable for the stretching treatment.

Both the pair of rails 13R, 14R provided in the link device 10R and the pair of rails 13L, 14L provided in the link device 10L are arranged in a ring over the regions 20A, 20B, 20C. In the following description, in each of the link devices 10R and 10L, the side facing the membrane 8 is called the "membrane side", and the side opposite to the "membrane side" is called the "return side". The side where the plurality of links 11 are conveyed from the inlet to the outlet while the clips 12 (12R, 12L) are gripping the membrane 8 corresponds to the "membrane side" and is located opposite to the "membrane side", The side on which the clips 12 do not grip the membrane 8 and the links 11 are conveyed from the outlet toward the inlet corresponds to the "return side".

In the link device 10R, the sprockets 16R, 17R, and 18R are arranged inside an annular rail 13R (inner rail) in plan view, of which the sprockets 16R and 17R are arranged on the entrance side (area 20A), A sprocket 18R is located on the exit side (region 20C). Similarly, in the link device 10L, the sprockets 16L, 17L, and 18L are arranged inside an annular rail 13L (inner rail) in plan view, and the sprockets 16L and 17L among them are on the entrance side (region 20A). , and the sprocket 18L is located on the outlet side (region 20C). The sprockets 16R, 17R, and 18R are engaged with a plurality of links 11R, and when the sprockets 16R, 17R, and 18R rotate, a driving force acts on the plurality of links 11R, thereby forming the link device 10R. link 11R can move along the rails 13R and 14R. Similarly, the sprockets 16L, 17L, and 18L are engaged with a plurality of links 11L, and when the sprockets 16L, 17L, and 18L rotate, a driving force acts on the plurality of links 11L, thereby moving the link device 10L. A plurality of links 11L that constitute it can move along the rails 13L and 14L.

In each of the link devices 10R and 10L, the plurality of links 11 are arranged on rails 13 and 14 such that the pitch between adjacent links 11 can be changed. In each of the link devices 10R and 10L, each link 11 has one end on and is movable along the rail 13, and the other end on and along the rail 14. A clip 12 is attached to one end of each link 11 (the end on the side that is placed on the rail 14). Therefore, when the link 11 moves, the clip 12 moves together with the link 11. - 特許庁Therefore, in each of the link devices 10R and 10L, when the pitch of the adjacent links 11 changes, the pitch of the adjacent clips 12 also changes accordingly. That is, when the pitch between adjacent links 11 increases, the pitch between adjacent clips 12 also increases accordingly. A specific structure of each link 11 will be described in more detail later.

In each of the link devices 10R and 10L, the pitch P1 between the links 11 adjacent to each other can be changed according to the interval (separation distance) L1 between the rails 13 and 14. The pitch P2 between the rails 13 and 14 can also be changed according to the interval (separation distance) L1 between the rails 13 and 14 . Therefore, by adjusting the interval L1 between the rails 13 and 14 in each of the link devices 10R and 10L, it is possible to adjust the pitch P1 between the links 11 adjacent to each other, thereby adjusting the pitch P1 between the clips 12 adjacent to each other. P2 can be adjusted. This is because, as can be seen from FIG. 4, in each of the link devices 10R and 10L, the smaller the interval L1 between the rails 13 and 14, the larger the angle formed by the adjacent links 11 and the pitch P1 between the adjacent links 11. because it grows.

Specifically, as can be seen from (a) of FIG. 4, in each of the link devices 10R and 10L, when the distance L1 between the rails 13 and 14 is large, the pitch P1 between the links 11 adjacent to each other is As a result, the pitch P2 between the adjacent clips 12 also becomes smaller. Also, as can be seen from FIG. 4B, in each of the link devices 10R and 10L, when the distance L1 between the rails 13 and 14 is small, the pitch P1 between the links 11 adjacent to each other is large. Accordingly, the pitch P2 between adjacent clips 12 also increases. Therefore, in each of the link devices 10R and 10L, in a region where the distance L1 between the rails 13 and 14 is small (corresponding to (b) of FIG. 4), the distance L1 between the rails 13 and 14 is Compared to the large area (corresponding to (a) of FIG. 4), the pitch P1 between adjacent links 11 is increased, and accordingly the pitch P2 between adjacent clips 12 is also increased. For this reason, in each of the link devices 10R and 10L, if a region (corresponding to region 20B) in which the interval L1 between the rails 13 and 14 is gradually reduced in the conveying direction (MD direction) is provided, then in that region The pitch P1 between the matching links 11 gradually increases, and accordingly the pitch P2 between the adjacent clips 12 also gradually increases.

Since the clip 12 is attached to each link 11, the pitch P1 between the adjacent links 11 and the pitch P2 between the clips 12 attached to the link 11 are substantially the same. That is, P1=P2 holds in FIG. 4(a), P1=P2 holds in FIG. 4(b), and P1 and P2 in FIG. is large.

Next, the operation of the stretching device 5 will be described.

The film 8 supplied (conveyed) from the raw fabric cooling device 4 to the stretching device 5 is clipped 12 attached to the link 11 (11R, 11L) provided in each of the link devices 10R, 10L at the entrance of the stretching device 5. It is gripped by (12R, 12L). That is, one end of the film 8 (the right end with respect to the conveying direction) is gripped by the clip 12R of the link device 10R, and the other end of the film 8 (the left end with respect to the conveying direction) is gripped. is gripped by the clip 12L of the link device 10L. Since the film 8 gripped by the clips 12R and 12L is conveyed in the MD direction from the inlet to the outlet of the stretching device 5 together with the clips 12R and 12L, the region 20A (preheating region) and the region 20B (stretching region) and region 20C (heat setting region). The membrane 8 gripped by the clips 12R, 12L is heated while passing through the regions 20A, 20B, 20C and stretched in the MD and TD directions when passing through the region 20B. The membrane 8 gripped by the clips 12R, 12L then reaches the outlet of the stretching device 5 and is removed from the clips 12R, 12L there. The film 8 removed from the clips 12R and 12L is transported from the outlet of the stretching device 5 to the take-up device 6, and transported from the take-up device 6 to the take-up device 7 to be taken up.

The operation of the stretching device 5 in the area 20A (preheating area) will be described.

In the region 20A, the interval (interval in the TD direction) L2 between the rail 14R of the link device 10R and the rail 14L of the link device 10L is substantially constant. Therefore, the film 8 is not stretched in the TD direction in the region 20A. Therefore, in the region 20A, the width (dimension in the TD direction) of the transported film 8 does not change and remains constant.

Also, in the region 20A, the distance (L1) between the rail 13R and the rail 14R on the membrane side of the linkage 10R is substantially constant. Therefore, in the region 20A, the pitch (P1) of the links 11R on the membrane side of the linking device 10R is substantially constant, and therefore the pitch (P2) of the clips 12R on the membrane side of the linking device 10R is also substantially constant. That is, in the region 20A, the pitch (P2) of the clip 12R that grips the membrane 8 is substantially constant. Also, in the region 20A, the distance (L1) between the rails 13L and 14L on the membrane side of the linkage 10L is substantially constant. Therefore, in the region 20A, the pitch (P1) of the links 11L on the membrane side of the linking device 10L is substantially constant, and therefore the pitch (P2) of the clips 12L on the membrane side of the linking device 10L is also substantially constant. That is, in the region 20A, the pitch (P2) of the clip 12L that grips the membrane 8 is substantially constant. Therefore, the film 8 is not stretched in the MD direction in the region 20A. Therefore, in the region 20A, the film 8 is not stretched in either the TD or MD direction.

The operation of the stretching device 5 in the area 20B (stretching area) will be described.

In the region 20B, the interval (interval in the TD direction) L2 between the rail 14R of the linking device 10R and the rail 14L of the linking device 10L gradually increases in the conveying direction (MD direction). Therefore, in the area 20B, the distance ( distance in the TD direction) gradually increases. Accordingly, in the region 20B, the film 8 is pulled and stretched in the TD direction by the clips 12R and 12L as it advances in the transport direction (MD direction), so the film 8 is stretched in the TD direction. Therefore, in the region 20B, the width (dimension in the TD direction) of the film 8 gradually increases as it progresses in the transport direction (MD direction).

Further, in the area 20B, the distance (L1) between the rail 13R and the rail 14R on the film side of the link device 10R is gradually reduced as it progresses in the transport direction (MD direction). The spacing (L1) between rails 13L and 14L on the membrane side of 10L is also gradually reduced. Therefore, in the region 20B, the pitch (P1) of the links 11R on the membrane side of the linking device 10R gradually increases in the conveying direction (MD direction). The pitch (P2) of is also gradually increased. That is, in the region 20B, the pitch (P2) of the clip 12L that grips the membrane 8 gradually increases. Further, in the region 20B, the pitch (P1) of the links 11L on the membrane side of the linking device 10L gradually increases along the conveying direction (MD direction). The pitch (P2) also gradually increases. That is, in the region 20B, the pitch (P2) of the clip 12R that grips the membrane 8 gradually increases. Accordingly, in the region 20B, the film 8 is pulled in the MD direction by the clips 12R and stretched in the MD direction by the clips 12R as it advances in the transport direction (MD direction), and is stretched in the MD direction by the clips 12L. 8 will be stretched in the MD direction.

Therefore, in the region 20B, the film 8 is stretched (stretched) in the TD and MD directions as it advances in the transport direction (MD direction). That is, in the region 20B, the film 8 is stretched in the TD and MD directions.

The operation of the stretching device 5 in the area 20C (heat setting area) will be described.

In the region 20C, the interval (interval in the TD direction) L2 between the rail 14R of the link device 10R and the rail 14L of the link device 10L is substantially constant. Therefore, the film 8 is not stretched in the TD direction in the region 20C. Therefore, in the region 20C, the width (dimension in the TD direction) of the transported film 8 does not change and remains constant.

Also, in the region 20C, the distance (L1) between the rail 13R and the rail 14R on the membrane side of the linkage 10R is substantially constant. Therefore, in the region 20C, the pitch (P1) of the links 11R on the membrane side of the linking device 10R is substantially constant, and therefore the pitch (P2) of the clips 12R on the membrane side of the linking device 10R is also substantially constant. That is, in the region 20C, the pitch (P2) of the clip 12R that grips the membrane 8 is substantially constant. Also, in the region 20C, the distance (L1) between the rails 13L and 14L on the membrane side of the linkage 10L is substantially constant. Therefore, in the region 20C, the pitch (P1) of the links 11L on the membrane side of the linking device 10L is substantially constant, and therefore the pitch (P2) of the clips 12L on the membrane side of the linking device 10L is also substantially constant. That is, in the region 20C, the pitch (P2) of the clip 12L that grips the membrane 8 is substantially constant. Therefore, the film 8 is not stretched in the MD direction in the region 20C. Therefore, in the region 20C, the film 8 is not stretched in either the TD or MD directions.

As described above, in the region 20A, the pitch (P1) of the links 11R on the membrane side of the linking device 10R is constant, and the pitch (P1) of the links 11L on the membrane side of the linking device 10L is also constant, In the region 20B, the pitch (P1) of the links 11R on the membrane side of the linking device 10R and the pitch (P1) of the links 11L on the membrane side of the linking device 10L are gradually increased. In the region 20C, the pitch (P1) of the links 11R on the membrane side of the linking device 10R is constant, and the pitch (P1) of the links 11L on the membrane side of the linking device 10L is also constant. Therefore, on the film side of each of the link devices 10R and 10L, the pitch (P1) of the links 11R in the region 20C is greater than the pitch (P1) of the links 11R in the region 20A, and the pitch (P1) of the links 11L in the region 20C (P1) is greater than the pitch (P1) of the links 11L in the region 20A. From another point of view, the pitch (P2) of the clips 12R in the region 20C is greater than the pitch (P2) of the clips 12R in the region 20A on the membrane side of each of the linking devices 10R and 10L. The pitch (P2) of 12L is greater than the pitch (P2) of clips 12L in region 20A. From another point of view, on the membrane side of each of the link devices 10R and 10L, the interval (L1) between the rails 13R and 14R in the region 20C is smaller than the interval (L1) between the rails 13R and 14R in the region 20A, and , the spacing (L1) between the rails 13L and 14L in the region 20C is smaller than the spacing (L1) between the rails 13L and 14L in the region 20A.

<Structures of Link 11 and Clip 12>
Next, structures of the link 11 and the clip 12 will be described.
The following description is applicable to the link 11, clip 12 and rails 13, 14 (i.e., link 11R, clip 12R and rails 13R, 14R) that make up the linkage 10R, and also to the links that make up the linkage 10L. 11, clip 12 and rails 13, 14 (ie link 11L, clip 12L and rails 13L, 14L).

As shown in FIGS. 5 to 7, each link 11 includes an upper link plate 22, a lower link plate 23, and rail holders 24 and 25. As shown in FIGS. Each of the upper-stage side link plate 22 and the lower-stage side link plate 23 is a plate-shaped member extending linearly in plan view. A common shaft 26 is inserted between one end of the upper link plate 22 and the lower link plate 23 . as a rotation axis, and are connected through a shaft 26 in a freely rotatable state. A clip 12 is attached to one end of the lower-stage link plate 23 . In the lower-stage link plate 23, the shaft 26 is inserted between one end to which the clip 12 is attached and the other end.

Each clip 12 has a body portion 31, a gripping portion 32 capable of moving up and down with respect to the body portion 31, a spring portion 33 for moving the gripping portion 32 up and down, and the like. By moving the grasping portion 32 up and down by the force of the portion 33 and the like, the film 8 can be grasped while being sandwiched between the main body portion 31 and the grasping portion 32 .

A shaft 27 is inserted into the other end of the upper-stage link plate 22 (the end opposite to the side where the shaft 26 is inserted). The shaft 27 connects the links 11 adjacent to each other. Specifically, a common shaft 27 is inserted in the upper link plate 22 of one link 11 and the lower link plate 23 of the other link 11 among the links 11 adjacent to each other. As a result, the upper link plate 22 of one of the links 11 adjacent to each other and the lower link plate 23 of the other link 11 are rotatable about the center of the shaft 27 as the rotation axis. 27. An engaging portion 28 that engages with the sprockets 16 , 17 , 18 is attached to the other end of the upper-stage link plate 22 .

A rail holder 25 is attached to the lower end of the shaft 26 so as to be rotatable around the center of the shaft 26 as a rotation axis. A rail holder 24 is attached to the lower end of the shaft 27 so as to be rotatable about the center of the shaft 27 as a rotation axis. The rail holder 24 is arranged to cover the rail 13 and the rail holder 25 is arranged to cover the rail 14 . The rail holder 24 has a pair of bearing rollers 34 and 35, and the rail 13 is sandwiched between the bearing rollers 34 and 35 from both sides. Moreover, the rail holder 25 has a pair of bearing rollers 36 and 37, and the rail 14 is sandwiched between the bearing rollers 36 and 37 from both sides. Therefore, the rail holder 24 is arranged to cover the rail 13 while being movable along the rail 13 . Moreover, the rail holder 25 is arranged so as to cover the rail 14 while being movable along the rail 14 .

The link 11 moves along the rails 13 , 14 because the rail holders 24 , 25 move along the rails 13 , 14 when the driving force due to the rotation of the sprockets 16 , 17 , 18 acts on the link 11 . When the interval (L1) between the rails 13 and 14 changes while the link 11 is moving along the rails 13 and 14, the upper and lower link plates 22 and 23 rotate following the change. As a result, the angle θ between the upper link plate 22 and the lower link plate 23 changes. As a result, the pitch (P1) between the adjacent links 11 changes according to the spacing (L1) between the rails 13,14. The pitch (P1) between adjacent links 11 can be defined with the center of shaft 26 as a reference. That is, the pitch (P1) between adjacent links 11 can be defined as the center-to-center distance between shafts 26 of adjacent links 11 . The pitch (P1) of adjacent clips 12 is substantially the same as the pitch (P2) of adjacent links 11 .

<Regarding Rails 13, 14 and Support Base 15>
Next, the rails 13 and 14 and the support base 15 that supports them will be described with reference to FIGS. 6 to 14. FIG.

FIG. 8 is a plan view showing the arrangement positions of the rails 13 and 14, and shows a state where the rail 14 is arranged at the rail position 71 and the rail 13 is arranged at the rail position 72 in each of the link devices 10L and 10R. It is 9 is a partially enlarged plan view showing an enlarged region RG1 surrounded by a two-dot chain line in FIG. 8, and FIG. 10 is an enlarged portion showing a region RG2 surrounded by a two-dot chain line in FIG. It is an enlarged plan view. In FIGS. 8-10, rail locations 73 are indicated by dashed lines. FIG. 11 is a plan view showing the arrangement position of the rails 13 and 14 when the arrangement position of the rail 13 is changed from the state shown in FIG. , and rail 13 is shown positioned at rail position 73 . 12 is a partially enlarged plan view showing an enlarged region RG3 surrounded by a two-dot chain line in FIG. 11, and FIG. 13 is an enlarged portion showing a region RG4 surrounded by a two-dot chain line in FIG. It is an enlarged plan view. 11-13, rail locations 72 are indicated by dashed lines. FIG. 14 is a cross-sectional view of the link 11 similar to FIG. 6 above, but FIG. 6 above corresponds to a cross-sectional view when the rail 13 is arranged at the rail position 72 (in the case of FIGS. 8 to 10). 14 corresponds to the cross-sectional view when the rail 13 is arranged at the rail position 73 (case of FIGS. 11 to 13).

The link devices 10R and 10L each have a support base 15. As shown in FIG. 8 and 11, the support base 15 for the link device 10R (that is, the support base 15R that supports the rails 13R and 14R) and the support base 15 for the link device 10L (that is, the support base that supports the rails 13L and 14L) 15L) are provided separately, and the following description will be based on this case.

The rails 13, 14 (that is, the rails 13R, 14R) of the link device 10R are arranged on the support base 15 (that is, the support base 15R) of the link device 10R, and are supported by fixing members such as screws 41 (see FIG. 6). It is held or fixed to the base 15 (15R). The rails 13, 14 (ie, rails 13L, 14L) of the link device 10L are arranged on the support base 15 (ie, support base 15L) of the link device 10L, and are supported by fixing members such as screws 41 (see FIG. 6). It is held or fixed to the base 15 (15L).

The following description can be applied to the support base 15 and the rails 13, 14 (that is, the support base 15R and the rails 13R, 14R) that constitute the linkage device 10R, and the support base 15 and the rails that constitute the linkage device 10L. 13, 14 (ie support 15L and rails 13L, 14L).

The support base 15 is a member that supports the rails 13 and 14, and is made of, for example, a plate-like (flat plate-like) member (such as a metal plate). As shown in FIG. 6, the support base 15 is provided with a plurality of holes (screw hole portions) 51 . A screw groove is formed on the inner surface of each hole portion 51 as necessary.

The rail 14 is provided with a plurality of holes (screw holes) 61 passing through the rail 14, and the rail 13 is provided with a plurality of holes (screw holes) 62 passing through the rail 13. It is Thread grooves are formed on the inner side surfaces of the holes 61 and 62 as necessary. The rail 14 is positioned by inserting the screw 41 into the hole 61 of the rail 14 and the hole 51 of the support base 15 from the upper surface side of the rail 14 , and the rail 14 is fixed or held on the support base 15 . By inserting the screws 41 into the holes 62 of the rail 13 and the holes 51 of the support base 15 from the upper surface side of the rail 13, the rail 13 is positioned, and the rail 13 is fixed or held on the support base 15. there is Also, the rail 13 can be removed from the support base 15 by pulling out (removing) the screw 41 inserted into the hole 62 of the rail 13 . Also, the rail 14 can be removed from the support base 15 by pulling out (removing) the screw 41 inserted into the hole 61 of the rail 14 .

It is preferable to prevent the screws 41 from contacting the links 11 (rail holders 24, 25) arranged on the rails 13, 14 while the rails 13, 14 are fixed to the support base 15 by the screws 41. Therefore, it is preferable that the screws 41 do not protrude from the upper surfaces of the rails 13 and 14 . As a result, it is possible to accurately prevent the screw 41 from interfering with the movement of the link 11 .

Further, in the case of FIG. 6, the hole 51 is formed on the upper surface side of the support base 15 and reaches halfway through the thickness of the support base 15 from the upper surface of the support base 15. It does not penetrate the support base 15 . As another form, the holes 51 may pass through the support base 15. In this case, bolts may be used as the screws 41, and the rails 13 and 14 are fixed to the support base 15 with bolts and nuts. be able to.

A plurality of holes 51 formed in the support base 15 include a plurality of holes 51a for positioning the rail 14 at a predetermined rail position 71 and a plurality of holes 51a for positioning the rail 13 at a predetermined rail position 72. , but also includes a plurality of holes 51c for locating rail 13 in other rail locations 73. As shown in FIG.

The rail 14 is arranged at a position where the hole 61 of the rail 14 is aligned with the hole 51a of the support base 15, and the screw 41 is inserted into the hole 61 of the rail 14 and the hole 51a of the support base 15. , the rail 14 is fixed to the support base 15 , and the arrangement position of the rail 14 is referred to as a rail position 71 . The hole portion 51a of the support table 15 can function as a positioning means (positioning portion) for determining the position of the rail 14 arranged on the support table 15. By using the hole portion 51a, the rail 14 can be It is positioned and fixed to the rail position 71 . In the support base 15 , a plurality of holes 51 a are arranged along the rail position 71 .

The rail 13 is arranged at a position where the hole 62 of the rail 13 is aligned with the hole 51b of the support base 15, and the screw 41 is inserted into the hole 62 of the rail 13 and the hole 51b of the support base 15. , the rail 13 is fixed to the support base 15 , and the arrangement position of the rail 13 is called a rail position 72 . The hole portion 51b of the support table 15 can function as a positioning means (positioning portion) for determining the position of the rail 13 arranged on the support table 15. By using the hole portion 51b, the rail 13 can be It is positioned and fixed to the rail position 72 . In the support base 15 , a plurality of holes 51 b are arranged along the rail position 72 .

Each of the rails 13 and 14 is an annular rail in plan view. Each of the rails 13 and 14 can be a continuous (integral) annular rail. Rails (13, 14) may be formed. This facilitates the manufacture of the rail members and facilitates the preparation of the annular rails (13, 14).

In this embodiment, the arrangement position of the rails 13 on the support base 15 can be changed. That is, the rail 13 is arranged at the rail position 72 on the support base 15 , but the arrangement position of the rail 13 can be changed from the rail position 72 to the rail position 73 . That is, the states of FIGS. 6 and 8-10 can be changed to the states of FIGS. 11-14. Therefore, in addition to a plurality of holes 51a for positioning the rail 14 at the rail position 71 and a plurality of holes 51b for positioning the rail 13 at the rail position 72, the support base 15 further includes: A plurality of holes 51c for positioning the rail 13 at the rail position 73 are also formed.

By arranging the rail 13 at a position where the hole 62 of the rail 13 is aligned with the hole 51c of the support base 15, and inserting the screw 41 into the hole 62 of the rail 13 and the hole 51c of the support base 15, The rail 13 can also be fixed to the support base 15 , and the arrangement position of the rail 13 at that time is called a rail position 73 . The hole portion 51c of the support table 15 can function as a positioning means (positioning portion) for determining the position of the rail 13 arranged on the support table 15. By using the hole portion 51c, the rail 13 can be positioned as a rail. It can be positioned and fixed at position 73 . In the support base 15 , a plurality of holes 51 c are arranged along the rail position 73 .

When the holes 62 of the rail 13 are aligned with the holes 51b of the support base 15 and the screws 41 are inserted into the holes 62 and 51b to screw the rail 13 to the support base 15, the rail 13 is 6 and 8-10 correspond to this state. On the other hand, when the hole 62 of the rail 13 is aligned with the hole 51c of the support base 15 and the screws 41 are inserted into the holes 62 and 51c to screw the rail 13 to the support base 15, the rail 13 is positioned at the rail position 73, and FIGS. 11-14 correspond to this state. Therefore, placing the rail 13 at the rail position 72 or placing the rail 13 at the rail position 73 can be selected. Then, the arrangement position of the rail 13 on the support table 15 can be changed from the rail position 72 to the rail position 73, and can be changed from the rail position 73 to the rail position 72.

On the other hand, the arrangement position of the rail 14 on the support base 15 is fixed. That is, the position of the rail 14 placed on the support base 15 is not changed. For this reason, a hole portion 51 a for arranging the rail 14 at the rail position 71 is provided as the hole portion 51 for positioning the rail 14 . The portion 51 is not provided on the support base 15 . However, during maintenance or the like, the rail 14 can be removed from the support base 15 by removing (pulling out) the screw 41 with which the rail 14 is screwed.

Since rail 14 is located at rail position 71 and rail 13 is located at either rail position 72 or rail position 73, rail 14 is located at rail position 71 and rail 13 is located at rail position 72. 6 and 8 to 10), and the case in which the rail 14 is arranged at the rail position 71 and the rail 13 is arranged at the rail position 73 (in the case of FIGS. 11 to 14). could be. When the rail 14 is arranged at the rail position 71 and the rail 13 is arranged at the rail position 72 (in the case of FIGS. 6 and 8 to 10), and when the rail 14 is arranged at the rail position 71 and the rail 13 is placed at the rail position 73 (in the case of FIGS. 11 to 14), the stretching ratio of the film 8 in the MD direction can be changed. That is, when it becomes necessary to change the stretching ratio of the film 8 in the MD direction, the arrangement position of the rail 13 on the support table 15 is changed from the rail position 72 to the rail position 73 .

The arrangement position of the rail 13 on the support base 15 can be changed from the rail position 72 to the rail position 73 as follows. That is, first, the screw 41 is removed (pulled out) from the rail member (rail 13) screwed to the rail position 72, the rail member (rail 13) is moved to the rail position 73, and then the rail member The rail member (rail 13) is screwed to the rail position 73 by inserting the screw 41 into the hole 62 of (the rail 13) and the hole 51c of the support base 15. As shown in FIG. In this case, the rail 13 arranged at the rail position 72 and the rail 13 arranged at the rail position 73 can be formed using the same (common) rail member. There is no need to separately prepare the parts. Therefore, the manufacturing cost of the stretching device 5 can be suppressed.

As another form, a rail member for the rail position 73 may be prepared in advance separately from the rail member arranged at the rail position 72 . In this case, the screw 41 is removed (pulled out) from the rail member (rail 13) screwed to the rail position 72, the rail member is removed from the support base 15, and then a separately prepared rail member (rail 13) is removed. ) is placed at the rail position 73, the screw 41 is inserted into the hole 62 of the rail member (rail 13) and the hole 51c of the support base 15, and the rail member (rail 13) is screwed to the rail position 73. stop.

As described above, the pitch (P1) of the links 11 varies according to the spacing (L1) between the rails 13 and 14, and accordingly the pitch (P2) of the clips 12 that grip the membrane 8 also varies. At the entrance of the stretching device 5, the membrane 8 is gripped by the clips 12, and the pitch (P2) of the clips 12 at that time is assumed to be α1. In the region 20A (preheating region), the pitch (P2) of the clip 12 that grips the membrane 8 is α1. As described above, in the region 20B (stretching region), the pitch (P2) of the clip 12 that grips the film 8 gradually increases as it progresses in the transport direction (MD direction). The pitch (P2) of the clips 12 that grip the film 8 after the stretching process has been performed in the region 20B (stretching region), that is, the pitch (P2) of the clips 12 that grip the film 8 in the region 20C (thermal setting region). be α2. α2 is greater than α1, and α1<α2. The pitch (P2) of the clip 12 that grips the membrane 8 is substantially constant and α1 in the region 20A, gradually increases from α1 to α2 in the region 20B, and is substantially constant in the region 20C. Yes, and α2. The ratio of α2 to α1 (that is, α2/α1) corresponds to the stretching ratio (stretch ratio) of the film 8 in the MD direction. For example, if α2 is 7 times as large as α1 (i.e., α2/α1=7), the film 8 will be stretched 7 times in the MD direction by the stretching device 5, and α2 will be 5 times as large as α1 (i.e., If α2/α1=5), the film 8 will be stretched five times in the MD direction by the stretching device 5 .

When the rail 14 is arranged at the rail position 71 and the rail 13 is arranged at the rail position 72 (in the case of FIGS. 6 and 8 to 10), and when the rail 14 is arranged at the rail position 71 and the rail 13 is placed at the rail position 73 (in the case of FIGS. 11 to 14), the stretching ratio of the film 8 in the MD direction is different. For example, when the rail 14 is arranged at the rail position 71 and the rail 13 is arranged at the rail position 72 (in the case of FIGS. 6 and 8 to 10), the stretching ratio of the film 8 in the MD direction (α2/α1 ) is 7 times, and when the rail 14 is arranged at the rail position 71 and the rail 13 is arranged at the rail position 73 (in the case of FIGS. 11 to 14), the stretching ratio of the film 8 in the MD direction ( α2/α1) becomes five times. Therefore, when it is desired to increase the stretching ratio of the film 8 in the MD direction to 7 times, the position of the rail 13 on the support table 15 is set to the rail position 72, and when it is desired to increase the stretching ratio of the film 8 in the MD direction to 5 times, the supporting position is set to the rail position 72. The arrangement position of the rail 13 on the base 15 may be changed to the rail position 73 . In addition, the numerical value of the draw ratio of MD direction shown here is an example, and is not limited to this.

Also, the film 8 is gripped by the clip 12 at the entrance of the stretching device 5, and the width of the film 8 (dimension in the TD direction) at that time is assumed to be width β1. The width of the film 8 substantially matches the distance (the distance in the TD direction) between the clip 12R of the linking device 10R and the clip 12L of the linking device 10L that grip the film 8. As shown in FIG. As described above, the film 8 is stretched in the MD and TD directions in the region 20B (stretching region), so the width (dimension in the TD direction) of the film 8 gradually increases in the region 20B (stretching region). Assume that the width of the film 8 after the stretching treatment is performed in the region 20B (stretching region), that is, the width (dimension in the TD direction) of the film 8 in the region 20C (heat setting region) is β2. β2 is greater than β1, and β1<β2 holds. The width of the membrane 8 is almost constant and β1 in the region 20A (preheating region), gradually increases from β1 to β2 in the region 20B (stretching region), and , is almost constant and is β2. The ratio of β2 to β1 (ie, β2/β1) corresponds to the stretching ratio (stretch ratio) of the film 8 in the TD direction. For example, if β2 is 7 times β1 (ie, β2/β1=7), the film 8 will be stretched 7 times in the TD direction by the stretching device 5 .

When the rail 14 is arranged at the rail position 71 and the rail 13 is arranged at the rail position 72 (in the case of FIGS. 6 and 8 to 10), and when the rail 14 is arranged at the rail position 71 and the rail 13 is placed at the rail position 73 (in the case of FIGS. 11 to 14), the stretching ratio of the film 8 in the TD direction is the same. This is because even if the arrangement position of the rail 13 is changed from the rail position 72 to the rail position 73 , the arrangement position of the rail 14 is not changed from the rail position 71 . The distance between the clip 12R of the linkage 10R and the clip 12L of the linkage 10L that grip the membrane 8 (the distance in the TD direction) is the rail 14R (outer rail) of the linkage 10R and the rail 14L (outer rail) of the linkage 10L. rail) (interval in the TD direction). Therefore, it is not the spacing (L1) between the rails 13R and 14R in the linking device 10R or the spacing (L1) between the rails 13L and 14L in the linking device 10L that affects the draw ratio of the membrane 8 in the TD direction, but the linking device The distance (L2) between the rail 14R of 10R and the rail 14L of the linkage 10L. Therefore, unless the position of the rail 14R of the linking device 10R and the position of the rail 14L of the linking device 10L are changed, the draw ratio of the film 8 in the TD direction is not changed. For example, when the rail 14 is arranged at the rail position 71 and the rail 13 is arranged at the rail position 72 (in the case of FIGS. 6 and 8 to 10), the rail 14 is arranged at the rail position 71 and In both cases where the rail 13 is placed at the rail position 73 (cases of FIGS. 11 to 14), the draw ratio (β2/β1) of the film 8 in the TD direction is 7 times. In addition, the numerical value of the draw ratio of the TD direction shown here is an example, and is not limited to this.

Here, rail position 71, rail position 72 and rail position 73 in link device 10R are referred to as rail position 71R, rail position 72R and rail position 73R, respectively, and rail position 71, rail position 72 and rail position 73 in link device 10L. are referred to as rail position 71L, rail position 72L, and rail position 73L, respectively.

When the rail 14R is placed at the rail position 71R and the rail 13R is placed at the rail position 72R in the link device 10R, the rail 14L is placed at the rail position 71L and the rail 13L is placed at the rail position 71L in the link device 10L. It is placed at the rail position 72L. On the other hand, when the rail 14R is arranged at the rail position 71R and the rail 13R is arranged at the rail position 73R in the link device 10R, the rail 14L is arranged at the rail position 71L and the rail 13L at rail position 73L. That is, when the arrangement position of the rail 13R is changed from the rail position 72R to the rail position 73R in the link device 10R, the arrangement position of the rail 13L is changed from the rail position 72L to the rail position 73L in the link device 10L. As a result, the MD stretch ratio (α2/α1) on the left side of the film 8 (link device 10L side) and the MD stretch ratio (α2/α1) on the right side of the film 8 (link device 10R side) are Since they can be matched, the stretching process of the film 8 can be performed accurately.

In order to perform the stretching process of the membrane 8 accurately, it is preferable that the pitch P1 of the links 11 in the linking device 10R and the pitch P1 of the links 11 in the linking device 10L are the same when the positions in the MD direction are the same. Therefore, when the positions in the MD direction are the same, it is preferable that the pitch P2 of the clips 12 in the link device 10R and the pitch P2 of the clips 12 in the link device 10L are the same. Thereby, α2/α1 (stretch ratio in the MD direction) in the link device 10R and α2/α1 (stretch ratio in the MD direction) in the link device 10L can be made the same. Therefore, it is preferable to set the rail positions 71R, 72R, 73R in the link device 10R and the rail positions 71L, 72L, 73L in the link device 10L so as to realize this.

In addition, the rail positions 72 and 73 are not entirely different, and some of them are common. That is, in FIGS. 8 and 11, the rail position 72 and the rail position 73 are different before the position 81 indicated by the arrow with the reference numeral 81 (this side in the MD direction), but the position 81 , the rail position 72 and the rail position 73 overlap each other, and the rail position 72 and the rail position 73 coincide with each other ahead of the position 81 (in the MD direction). This position 81 exists in the middle of the region 20B in the MD direction. Therefore, on the film side of each of the link devices 10L and 10R, when viewed in the MD direction, the rail positions 72 and 73 are different up to the middle of the regions 20A and 20B (position 81). From the middle of the region 20B (position 81) onwards, and in the region 20C, the rail positions 72 and 73 match. In the region where the rail positions 72 and 73 are different, the hole portions 51b and 51c are provided separately. The portion 51b and the hole portion 51c are shared, and the hole portion 51b also serves as the hole portion 51c. Therefore, on the film side of each of the link devices 10L and 10R, the hole 51b and the hole 51c are separately provided up to the middle of the regions 20A and 20B (position 81) when viewed in the MD direction. However, in the area 20C from the middle (position 81) of the area 20B, the hole 51b and the hole 51c are shared, and the hole 51b also serves as the hole 51c. Therefore, it is necessary to provide the hole portion 51c separately from the hole portion 51b up to the middle of the region 20A and the region 20B (position 81). It is not necessary to provide the hole portion 51c separately from the hole portion 51b. Therefore, when changing the arrangement position of the rail 13 from the rail position 72 to the rail position 73, it is sufficient to change the arrangement position of the rail 13 between the regions 20A and 20B (position 81). It is not necessary to change the arrangement position of the rail 13 from the middle (position 81) to the region 20C.

<Consideration example>
15 to 18, the stretching apparatus of the study example examined by the present inventors will be described. FIG. 15 is a plan view showing the arrangement positions of the rails 13 and 14 in the stretching device of the study example, and corresponds to FIG. 8 above. FIG. 16 is a partially enlarged plan view showing an enlarged region RG101 surrounded by a two-dot chain line in FIG. 15, and corresponds to FIG. 9 above. FIG. 17 is a partially enlarged plan view showing an enlarged region RG102 surrounded by a two-dot chain line in FIG. 15, and corresponds to FIG. 10 above. FIG. 18 is a cross-sectional view of the link 11 in the stretching device of the study example, and corresponds to FIG. 6 above.

15 also has a linking device 110R corresponding to the linking device 10R and a linking device 110L corresponding to the linking device 10L. As shown in FIG. 15, each of the link devices 110L and 110R has a support base 115 corresponding to the support base 15 and rails 13 and 14 arranged thereon. Although not shown in FIG. 15, each of the link devices 110L and 110R includes the plurality of links 11 and the plurality of clips attached to the plurality of links 11, respectively, in the same manner as the link devices 10L and 10R. 12 and the sprockets 16, 17, 18 driving the links 11 thereof.

The link devices 110L and 110R in the stretching device of the study example differ from the link devices 10L and 10R in the stretching device 5 of the present embodiment in the following points. That is, as can be seen from FIGS. 15 to 18, the support base 115 provided in each of the link devices 110L and 110R has a plurality of holes 51a for positioning the rail 14 at the rail position 71 and a plurality of holes 51a for positioning the rail 13 at the rail position 71. 72 are provided, but the plurality of holes 51c for positioning the rail 13 at the rail position 73 are not provided. Therefore, the rail 14 is arranged at the rail position 71, the rail 13 is arranged at the rail position 72, and the arrangement positions of the rails 13 and 14 on the support base 15 cannot be changed and are fixed. The rail 14 is arranged at the rail position 71 , and the rail 14 is fixed to the support base 15 by inserting the screw 41 into the hole 61 of the rail 14 and the hole 51 a of the support base 15 . The rail 13 is arranged at the rail position 72 , and the rail 13 is fixed to the support base 15 by inserting the screw 41 into the hole 62 of the rail 13 and the hole 51 b of the support base 15 .

Therefore, in the case of the stretching device of the study example (FIGS. 15 to 18), it is difficult to change the stretching ratio of the film because the arrangement positions of the rails 13 and 14 of the link devices 110L and 110R cannot be changed. . For example, if the positions of the rails 13 and 14 in the link devices 110L and 110R of the stretching device are set so that the stretching ratio of the film is 7 times in the TD direction and 7 times in the MD direction, the stretching It is difficult to perform a stretching process using an apparatus such that the film is stretched at a stretch ratio of 7 times in the TD direction and 5 times in the MD direction. For this reason, in the case of the study example, when it becomes necessary to perform a stretching process with a different stretching ratio than that possible with the stretching device that is already in use, another stretching device is prepared, or the stretching device that is already in use is used. This needs to be addressed by making major changes in the drawing equipment that is used. This increases the production cost when producing a thin film using a stretching device.

It is also conceivable to provide a mechanism (moving mechanism) for moving the position of the rail 13 in each of the link devices 110L and 110R, but this complicates the structure of the stretching device and increases the manufacturing cost of the stretching device. I will stay. This also increases the manufacturing cost when manufacturing a thin film using a stretching device.

<Main features and effects>
The stretching device 5 in the present embodiment includes a pair of link devices 10L and 10R for transporting and stretching the film (thermoplastic resin film) 8, and a central portion of the pair of link devices 10L and 10R that covers the film 8. and a heat treatment section 19 for performing heat treatment. Each of the pair of link devices 10L and 10R includes a support base 15, an annular rail (outer rail) 14 arranged on the support base 15 in a plan view, and an inner peripheral side of the rail 14 so as to face the rail 14. and a rail (inner rail) 13 arranged on the .

The main feature of this embodiment is that each of the pair of link devices 10L and 10R includes positioning means (here, a plurality of holes 51b) for positioning the rail 13 at the rail position 72, and positioning the rail 13 at the rail position 72. 73 and positioning means (here, a plurality of holes 51c). By arranging the rail 13 at the rail position 72 or the rail position 73, the stretching ratio of the film 8 can be made variable.

Specifically, the support base 15L includes positioning means (here, a plurality of holes 51b) for positioning the rail 13L at the rail position 72L, and positioning means (here, a plurality of holes 51b) for positioning the rail 13L at the rail position 73L. a plurality of holes 51c). Further, the support base 15R includes positioning means (here, a plurality of holes 51b) for positioning the rail 13R at the rail position 72R, and positioning means (here, a plurality of holes) for positioning the rail 13R at the rail position 73R. 51c). The rail 13L is arranged at either the rail position 72L or the rail position 73L, and the rail 13R is arranged at either the rail position 72R or the rail position 73R.

Since the link device 10L has positioning means for positioning the rail 13L at the rail position 72L and positioning means for positioning the rail 13L at the rail position 73L, the rail 13L is positioned at the rail position 72L and at the rail position 72L. It can be positioned and placed in either position 73L. Since there are positioning means for the rail position 72L and positioning means for the rail position 73L, even if the rail 13L is arranged at the rail position 72L, the arrangement position of the rail 13L is changed from the rail position 72L to the rail position 73L. Moreover, even if the rail 13L is arranged at the rail position 73L, the arrangement position of the rail 13L can be changed from the rail position 73L to the rail position 72L. Further, since the link device 10R has positioning means for positioning the rail 13R at the rail position 72R and positioning means for positioning the rail 13R at the rail position 73R, the rail 13R is positioned at the rail position 72R. and rail position 73R. Since there are positioning means for the rail position 72R and positioning means for the rail position 73R, even if the rail 13R is arranged at the rail position 72R, the arrangement position of the rail 13R is changed from the rail position 72R to the rail position 73R. Moreover, even if the rail 13R is arranged at the rail position 73R, the arrangement position of the rail 13R can be changed from the rail position 73R to the rail position 72R.

Therefore, in the case of the stretching device 5 of the present embodiment, it is possible to change the arrangement positions of the rails 13 and 14 in each of the link devices 10L and 10R, so that it is easy to change the stretching ratio of the film. That is, since the arrangement positions of the rail 13L and the rail 13R can be changed, the rail 13L is arranged at the rail position 72L and the rail 13R is arranged at the rail position 72R, and the rail 13L is arranged at the rail position 73L. Moreover, the draw ratio of the film 8 in the MD direction can be made different between when the rail 13R is arranged at the rail position 73R. By changing the arrangement positions of the rails 13L and 13R, the draw ratio of the film 8 in the MD direction can be changed. Therefore, the draw ratio of the film 8 can be easily and accurately changed. Therefore, it is possible to perform a plurality of stretching processes with different stretching ratios using one stretching apparatus. When the stretching process is performed using the stretching device 5 and a stretching process with a different stretching ratio from the stretching process is required, the arrangement positions of the rails 13L and 13R in the stretching device 5 can be changed. There is no need to provide a separate drawing device and no major modifications to the drawing device 5 are required. In addition, the number of required drawing apparatuses can be reduced. Therefore, the production cost can be suppressed (reduced) when producing a thin film using a stretching device.

For example, the rail positions 72L and 72R are set so that when the rail 13L is placed at the rail position 72L and the rail 13R is placed at the rail position 72R, the stretching ratio of the film 8 in the MD direction is 7 times. Keep The rail positions 73L and 73R are set so that the stretching ratio of the film 8 in the MD direction is 5 times when the rail 13L is placed at the rail position 73L and the rail 13R is placed at the rail position 73R. Keep As a result, the stretching process with a draw ratio of 7 times in the MD direction and the stretching process with a draw ratio of 5 times in the MD direction can be performed using one stretching device 5, and the change in the draw ratio can be It can be done easily and accurately. In addition, the numerical value of the draw ratio mentioned here is an example.

Moreover, in each of the link devices 10L and 10R, there is no need to provide a mechanism (moving mechanism) for moving the position of the rail 13, and the arrangement position of the rail 13 can be changed manually. At that time, the rail 13L is positioned by the positioning means for the rail position 72L and the positioning means for the rail position 73L, and the rail 13R is positioned by the positioning means for the rail position 72R and the positioning means for the rail position 73R. be able to. Therefore, the structure of the stretching device can be simplified, and the manufacturing cost of the stretching device can be suppressed. Also, the size of the stretching device can be reduced.

In addition, since the stretching magnification in the MD direction can be changed in one stretching apparatus, the stretching magnification in the MD direction can be selected according to the film 8 to be stretched. Therefore, the properties of the produced thin film (film after stretching) can be improved.

The positioning means for positioning the rail 13L at the rail position 72L and the positioning means for positioning the rail 13L at the rail position 73L are each a plurality of holes 51 provided in the support base 15L. can be done. The positioning means for positioning the rail 13R at the rail position 72R and the positioning means for positioning the rail 13R at the rail position 73R are each a plurality of holes 51 provided in the support base 15R. can be done. As a result, the rails 13L and 13R can be positioned and fixed with a simple configuration, so that the structure of the stretching device can be simplified and the manufacturing cost of the stretching device can be suppressed.

Further, in the link device 10L, the rail positions 72L and 73L have different parts and common parts, and in the link device 10R, the rail positions 72R and 73R It has parts that are different and parts that are common to each other. As a result, when changing the draw ratio, it is not necessary to move the rails 13L at the portions where the rail positions 72L and 73L are common, and at the portions where the rail positions 72R and 73R are common. Since it is not necessary to move the rail 13R, it is possible to reduce labor involved in changing the arrangement positions of the rails 13L and 13R.

Specifically, the portions where the rail positions 72L and 73L differ from each other exist in the regions 20A and 20B, and the portions where the rail positions 72R and 73R differ from each other exist in the regions 20A and 20B. Existing. In the region 20C, the rail positions 72L and 73L are common, and the rail positions 72R and 73R are common. Therefore, when changing the draw ratio, it is not necessary to change the arrangement positions of the rails 13L and 13R in the region 20C, and the labor involved in changing the arrangement positions of the rails 13L and 13R can be reduced accordingly. .

(Embodiment 2)
In the first embodiment described above, in each of the link devices 10L and 10R, there are two positions where the rail 13 can be arranged, that is, the rail position 72 and the rail position 73. However, there are three positions where the rail 13 can be arranged. It is also possible to have more than one, and that case corresponds to the second embodiment.

FIG. 19 is a plan view showing the arrangement positions of the rails 13 and 14 in the second embodiment, and corresponds to FIG. 8 above. positioned and shown with rail 13 positioned at rail position 72 . 20 is a partially enlarged plan view showing an enlarged region RG5 surrounded by a two-dot chain line in FIG. 19, and FIG. 21 is a portion showing an enlarged region RG6 surrounded by a two-dot chain line in FIG. It is an enlarged plan view. In FIGS. 19-21, rail position 73 and rail position 74 are indicated by dashed lines.

In the second embodiment, as can be seen from FIGS. 19 to 21, the rails 13 can be arranged at any of the rail positions 72, 73, and 73 in each of the link devices 10L and 10R. be. 19 to 21, the rail 13 is arranged at the rail position 72 in each of the link devices 10L and 10R. It is possible. The rail position 74 in the link device 10L is called a rail position 74L, and the rail position 74 in the link device 10R is called a rail position 74R. When the rail 14R is placed at the rail position 71R and the rail 13R is placed at the rail position 74R in the link device 10R, the rail 14L is placed at the rail position 71L and the rail 13L is placed at the rail position 71L in the link device 10L. Place at rail position 74L.

For this reason, the support base 15 has a plurality of holes 51a for positioning the rail 14 at the rail position 71, a plurality of holes 51b for positioning the rail 13 at the rail position 72, and a plurality of holes 51b for positioning the rail 13 at the rail position 72. In addition to the plurality of holes 51c for positioning the rail 73, a plurality of holes 51d for positioning the rail 13 at the rail position 74 are also formed. Therefore, the plurality of holes 51 formed in the support base 15 includes a plurality of holes 51a, a plurality of holes 51b, a plurality of holes 51c, and a plurality of holes 51d.

In the support base 15 , a plurality of holes 51 d are arranged along the rail position 74 . When the rail 13 is arranged at the rail position 74 , the rail 13 can be fixed to the support base 15 by inserting the screw 41 into the hole 62 of the rail 13 and the hole 51 d of the support base 15 . The hole portion 51d of the support base 15 can function as a positioning means (positioning portion) for determining the position of the rail 13 arranged on the support base 15. By using the hole portion 51d, the rail 13 can be positioned as a rail. It can be positioned and fixed at position 74 .

Thus, placing rail 13 at rail position 72 , placing rail 13 at rail position 73 , and placing rail 13 at rail position 74 can be selected. Then, the arrangement position of the rail 13 on the support table 15 can be changed from the rail position 72 to the rail position 73 or the rail position 74, or from the rail position 73 to the rail position 72 or the rail position 74. and can be changed from rail position 74 to rail position 72 or rail position 73.

Other than that, the stretching device 5 of the second embodiment is also substantially the same as the stretching device 5 of the first embodiment, and thus repeated explanations are omitted here.

The case where the rail 14 is arranged at the rail position 71 and the rail 13 is arranged at the rail position 72, the case where the rail 14 is arranged at the rail position 71 and the rail 13 is arranged at the rail position 73, and the rail 14 is placed at the rail position 71 and the rail 13 is placed at the rail position 74, the stretching ratios of the film 8 in the MD direction are different from each other. That is, the stretching ratio of the film 8 in the MD direction is changed depending on whether the rail 13 is arranged at the rail position 72, the rail 13 is arranged at the rail position 73, or the rail 13 is arranged at the rail position 74. , rail positions 71, 72, 73, and 74 are set. Therefore, when it becomes necessary to change the stretching ratio of the film 8 in the MD direction, the arrangement position of the rails 13 on the support table 15 is changed.

In Embodiment 2, the support base 15L further has a determining means (here, a plurality of holes 51d) for positioning the rail 13L at the rail position 74L, and the support base 15R positions the rail 13R at the rail position 74R. It further has positioning means (here, a plurality of holes 51d) for positioning. Therefore, in Embodiment 2, three types of stretching processes with different stretching ratios can be performed using one stretching apparatus.

For example, the rail positions 72L and 72R are set so that when the rail 13L is placed at the rail position 72L and the rail 13R is placed at the rail position 72R, the stretching ratio of the film 8 in the MD direction is 7 times. Keep Further, the rail positions 73L and 73R are set so that the stretching ratio of the film 8 in the MD direction is 5 times when the rail 13L is placed at the rail position 73L and the rail 13R is placed at the rail position 73R. Keep The rail positions 74L and 74R are set so that the stretching ratio of the film 8 in the MD direction is 9 times when the rail 13L is placed at the rail position 74L and the rail 13R is placed at the rail position 74R. Keep As a result, the stretching process with a draw ratio of 7 times in the MD direction, the stretching process with a draw ratio of 5 times in the MD direction, and the stretching process with a draw ratio of 9 times in the MD direction can be performed by one stretching device 5. The stretching ratio can be changed easily and accurately. In addition, the numerical value of the draw ratio mentioned here is an example.

Further, as another form, the number of positions where the rails 13 can be arranged can be four or more in each of the link devices 10L and 10R. In this case, the support base 15 may be provided with a plurality of holes 51 for positioning the rail 13 with respect to each of four or more rail positions where the rail 13 can be arranged. Also in this case, by changing the arrangement position of the rails 13, the draw ratio of the film 8 in the MD direction can be changed.

(Embodiment 3)
In Embodiments 1 and 2 above, the support base 15 for the link device 10R (that is, the support base 15R that supports the rails 13R and 14R) and the support base 15 for the link device 10L (that is, the support base that supports the rails 13L and 14L) 15L) were provided separately. On the other hand, in the third embodiment, the support base 15 for the link device 10R (that is, the support base 15 that supports the rails 13R and 14R) and the support base 15 for the link device 10L (that is, the rails 13L and 14L are supported) The rails 13R and 14R for the link device 10R and the rails 13L and 14L for the link device 10L are arranged on the support stand 15C which is the common support stand 15). Supported. Other than that, the third embodiment is also the same as the first or second embodiment.

FIG. 22 is a plan view showing the arrangement positions of the rails 13 and 14 when the third embodiment is applied to the first embodiment, and corresponds to FIG. 8 above. FIG. 22 shows a state in which the rail 14 is arranged at the rail position 71 and the rail 13 is arranged at the rail position 72 in each of the link devices 10L and 10R. In FIG. 22, rail locations 73 are indicated by dashed lines. The enlarged view of the region RG1 in FIG. 22 is the same as in FIG. 9 above, and the enlarged view of the region RG2 in FIG. 22 is the same as in FIG.

When the third embodiment is applied to the first embodiment, as can be seen from FIG. 22 and FIGS. 9 and 10, the positioning means for positioning the rail 14L at the rail position 71L and the rail 13L at the rail position 72L, positioning means for positioning the rail 13L at the rail position 73L, positioning means for positioning the rail 14R at the rail position 71R, and positioning the rail 13R at the rail position 72R. Positioning means for positioning and positioning means for positioning the rail 13R at the rail position 73R are provided on a common support base 15C. Specifically, a plurality of holes 51a for the rail position 71L, a plurality of holes 51b for the rail position 72L, a plurality of holes 51c for the rail position 73L, and a plurality of holes for the rail position 71R. 51a, a plurality of holes 51b for the rail position 72R, and a plurality of holes 51c for the rail position 73R are provided in a common support base 15C. Other than that, it is the same as the first embodiment.

FIG. 23 is a plan view showing the arrangement positions of the rails 13 and 14 when the third embodiment is applied to the second embodiment, and corresponds to FIG. 19 above. FIG. 23 shows a state in which the rail 14 is arranged at the rail position 71 and the rail 13 is arranged at the rail position 72 in each of the link devices 10L and 10R. In FIG. 23, rail position 73 and rail position 74 are indicated by dashed lines. The enlarged view of the region RG5 in FIG. 23 is the same as in FIG. 20 above, and the enlarged view of the region RG6 in FIG. 23 is the same as in FIG. 21 above.

When the third embodiment is applied to the second embodiment, as can be seen from FIG. 23 and FIGS. 20 and 21, positioning means for positioning the rail 14L at the rail position 71L and rail 13L at the rail position 72L, positioning means for positioning the rail 13L at the rail position 73L, positioning means for positioning the rail 13L at the rail position 74L, and positioning the rail 14R at the rail position 71R. positioning means for positioning, positioning means for positioning the rail 13R at the rail position 72R, positioning means for positioning the rail 13R at the rail position 73R, and positioning means for positioning the rail 13R at the rail position 74R means are provided on a common support base 15C. Specifically, a plurality of holes 51a for rail position 71L, a plurality of holes 51b for rail position 72L, a plurality of holes 51c for rail position 73L, and a plurality of holes for rail position 74L. 51d, a plurality of holes 51a for rail position 71R, a plurality of holes 51b for rail position 72R, a plurality of holes 51c for rail position 73R, and a plurality of holes 51d for rail position 74R. are provided on a common support base 15C. Other than that, it is the same as the second embodiment.

When the support base 15R for arranging the rails 13R and 14R and the support base 15L for arranging the rails 13L and 14L are provided separately as in the first and second embodiments, the support bases 15L and 15R are downsized. (area reduction), which is advantageous for miniaturization of the stretching apparatus.

On the other hand, when the rails 13L, 13R, 14L, 14R are arranged on the common support base 15C as in the third embodiment, there is a gap between the rail 14L for the link device 10L and the rail 14R for the link device 10R. (L2) can be easily set according to a predetermined design value.

Although the invention made by the present inventor has been specifically described based on the embodiment, the invention is not limited to the above embodiment, and can be variously modified without departing from the gist of the invention. Needless to say.

1 Thin film manufacturing system 2 Extruder 2a Raw material supply unit 3 T die 4 Original fabric cooling device 5 Stretching device 6 Take-up device 7 Winding device 8 Films 10, 10L, 10R Link devices 11, 11L, 11R Links 12, 12L, 12R Clips 13, 13L, 13R, 14, 14L, 14R Rails 15, 15L, 15R Support bases 16, 16L, 16R, 17, 17L, 17R, 18, 18L, 18R Sprocket 19 Heat treatment sections 20A, 20B, 20C Area 22 Upper side Link plate 23 Lower side link plates 24, 25 Rail holders 26, 27 Shaft 28 Engagement portion 31 Body portion 32 Grip portion 33 Spring portions 34, 35, 36, 37 Bearing roller 41 Screws 51, 51a, 51b, 51c, 51d, 61, 62 holes 71, 71L, 71R, 72, 72L, 72R, 73, 73L, 73R, 74, 74L, 74R rail positions P1, P2 pitches L1, L2 intervals

Claims (16)

Apparatus for stretching thermoplastic resin films, including:
a pair of link devices for conveying and stretching the thermoplastic resin film; and a heat treatment unit for heat-treating the thermoplastic resin film, covering the central portion of the pair of link devices,
Here, each of the pair of linking devices:
support base;
an outer rail arranged on the support base and having an annular shape in a plan view and an inner rail arranged on the inner peripheral side of the outer rail so as to face the outer rail;
first positioning means for positioning said inner rail at a first rail position;
second positioning means for positioning the inner rail at a second rail position;
has
The thermoplastic resin film is stretched in a first direction, which is a conveying direction of the thermoplastic resin film, and in a second direction that intersects with the first direction,
The arrangement position of the outer rail is fixed, and the draw ratio of the thermoplastic resin film in the first direction is made variable by arranging the inner rail at the first rail position or the second rail position. can ,
In each of the pair of link devices, the inner rail is arranged at the first rail position, and in each of the pair of link devices, the inner rail is arranged at the second rail position. Different draw ratios in the first direction of the thermoplastic resin film,
In each of the pair of link devices, the first positioning means and the second positioning means are a plurality of holes respectively provided in the support base. The stretching apparatus according to claim 1,
The stretching device, wherein the first rail position and the second rail position of each of the pair of linkages have portions that are different from each other and portions that are common to each other. The stretching apparatus according to claim 1,
Each of the pair of linking devices includes:
a plurality of links connected to form an endless chain and movable along the outer rail and the inner rail;
a plurality of clips for gripping the thermoplastic resin film respectively attached to the plurality of links;
A drawing device, further comprising: In the drawing apparatus according to claim 3 ,
The stretching device, wherein in each of the pair of link devices, a pitch of the plurality of clips for gripping the thermoplastic resin film is variable according to the distance between the inner rail and the outer rail. The stretching apparatus according to claim 1,
The stretching device, wherein the arrangement position of the inner rail can be changed to either the first rail position or the second rail position. The stretching apparatus according to claim 1,
each of said pair of linkages further comprising third positioning means for positioning said inner rail at a third rail position;
By arranging the inner rail at the first rail position, the second rail position, or the third rail position, the draw ratio of the thermoplastic resin film in the first direction can be made variable. , stretching equipment. In the drawing apparatus according to claim 6 ,
The stretching device, wherein the arrangement position of the inner rail can be changed to any of the first rail position, the second rail position, and the third rail position. In the drawing apparatus according to claim 6 ,
a case where the inner rail is arranged at the first rail position in each of the pair of link devices; a case where the inner rail is arranged at the second rail position in each of the pair of link devices; A stretching device, wherein the stretching ratio of the thermoplastic resin film in the first direction is different between when the inner rail is arranged at the third rail position in each of the pair of link devices. Apparatus for stretching thermoplastic resin films, including:
support base;
a pair of link devices for conveying and stretching the thermoplastic resin film; and a heat treatment unit for heat-treating the thermoplastic resin film, covering the central portion of the pair of link devices,
Here, each of the pair of linking devices:
an outer rail arranged on the support base and having an annular shape in a plan view and an inner rail arranged on the inner peripheral side of the outer rail so as to face the outer rail;
first positioning means for positioning said inner rail at a first rail position;
second positioning means for positioning the inner rail at a second rail position;
has
The thermoplastic resin film is stretched in a first direction, which is a conveying direction of the thermoplastic resin film, and in a second direction that intersects with the first direction,
The arrangement position of the outer rail is fixed, and the draw ratio of the thermoplastic resin film in the first direction is made variable by arranging the inner rail at the first rail position or the second rail position. can ,
In each of the pair of link devices, the inner rail is arranged at the first rail position, and in each of the pair of link devices, the inner rail is arranged at the second rail position. Different draw ratios in the first direction of the thermoplastic resin film,
The first positioning means and the second positioning means of each of the pair of link devices are a plurality of holes respectively provided in the support base. In the drawing apparatus according to claim 9 ,
The stretching device, wherein the arrangement position of the inner rail can be changed to either the first rail position or the second rail position. In the drawing apparatus according to claim 9,
The stretching device, wherein the first rail position and the second rail position of each of the pair of linkages have portions that are different from each other and portions that are common to each other. In the drawing apparatus according to claim 9,
Each of the pair of linking devices includes:
a plurality of links connected to form an endless chain and movable along the outer rail and the inner rail;
a plurality of clips for gripping the thermoplastic resin film respectively attached to the plurality of links;
A stretching device, further comprising: The stretching apparatus of claim 12, wherein
The stretching device, wherein in each of the pair of link devices, a pitch of the plurality of clips for gripping the thermoplastic resin film is variable according to the distance between the inner rail and the outer rail. In the drawing apparatus according to claim 9,
each of said pair of linkages further comprising third positioning means for positioning said inner rail at a third rail position;
By arranging the inner rail at the first rail position, the second rail position, or the third rail position, the draw ratio of the thermoplastic resin film in the first direction can be made variable. , stretching equipment. 15. The drawing apparatus of claim 14,
The stretching device, wherein the arrangement position of the inner rail can be changed to any of the first rail position, the second rail position, and the third rail position. 15. The drawing apparatus of claim 14,
A case where the inner rail is arranged at the first rail position in each of the pair of link devices; a case where the inner rail is arranged at the second rail position in each of the pair of link devices; 2. A stretching device in which the stretch ratio of the thermoplastic resin film in the first direction is different from that in the case where the inner rail is arranged at the third rail position in each of the link devices.

Images