Film conveyance device, film conveyance method, and film manufacturing device

Abstract

To provide a film conveyance device for automatically feeding a film.SOLUTION: A film conveyance device for feeding a film 83 from upstream to downstream includes a feeding mechanism 70 which includes: a first upper roll UR71 and a first lower roll LR71 which are provided on the upstream of a film conveyance path; a first vertical drive source for relatively moving the first upper roll and the first lower roll so that the first upper roll and the first lower roll approach each other; a first rotary drive source for rotating at least one of the first upper roll and the first lower roll; a second upper roll UR72 and a second lower roll LR72 which are provided on the downstream of the film conveyance path; a second vertical drive source (for example, lifting mechanism 725) for relatively moving the second upper roll and the second lower roll so that the second upper roll and the second lower roll approach each other; and a second rotary drive source for rotating at least one of the second upper roll and the second lower roll.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a film transport machine, a film transport method, and a film manufacturing apparatus. [Background technology]

[0002] Patent Document 1 discloses a stretching machine that conveys an extruded film and stretches the film, and a clipping device that holds the film with clips. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-187788 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the past, since it was not possible to feed the film between the longitudinal stretching region and the transverse stretching region, the film had to be fed manually by multiple people, which was tedious and inefficient.

[0005] The present disclosure has been made to solve such problems, and has an object to provide a film transport device and the like that automatically feeds a film. [Means for solving the problem]

[0006] In one embodiment of the film conveying machine, A film transport device that transports a film from upstream to downstream, a first upper roll and a first lower roll provided upstream of a film transport path; a first vertical drive source that moves the first upper roll and the first lower roll relatively so that the first upper roll and the first lower roll approach each other; A first rotary drive source that rotates at least one of the first upper roll and the first lower roll; A second upper roll and a second lower roll are provided downstream of the transport path of the film; a second vertical drive source that moves the second upper roll and the second lower roll relatively so that the second upper roll and the second lower roll approach each other; A second rotary drive source that rotates at least one of the second upper roll and the second lower roll; The feeding mechanism includes:

[0007] In one embodiment of the film transport method, a first upper roll and a first lower roll provided upstream of a film transport path; A film transport method for transporting a film from upstream to downstream using a transport mechanism including: a first vertical drive source that moves the first upper roll and the first lower roll relatively so that the first upper roll and the first lower roll approach each other; a first rotation drive source that rotates at least one of the first upper roll and the first lower roll; a second upper roll and a second lower roll provided downstream of a transport path of the film; a second vertical drive source that moves the second upper roll and the second lower roll relatively so that the second upper roll and the second lower roll approach each other; and a second rotation drive source that rotates at least one of the second upper roll and the second lower roll, the first upper roll and the first lower roll are brought closer to each other by the first vertical drive source to grip the film, and the first rotation drive source feeds the gripped film downstream; The second upper roll and the second lower roll are brought closer to each other by the second vertical drive source, the fed film is gripped, and the gripped film is fed downstream by the second rotation drive source.

[0008] In one embodiment of the film manufacturing apparatus, an extruder that melts and extrudes the input resin raw material; a die connected to the extruder for forming the molten resin into a film; a cooling roll that cools the film-like molten resin extruded from the die and carries out a resin film in which the molten resin has solidified; a longitudinal stretching machine provided downstream of the cooling roll for longitudinally stretching the film and feeding the film downstream; a first upper roll and a first lower roll provided upstream of a film transport path; a feed mechanism including: a first vertical drive source that moves the first upper roll and the first lower roll relatively so that the first upper roll and the first lower roll approach each other; a first rotation drive source that rotates at least one of the first upper roll and the first lower roll; a second upper roll and a second lower roll provided downstream of a transport path of the film; a second vertical drive source that moves the second upper roll and the second lower roll relatively so that the second upper roll and the second lower roll approach each other; and a second rotation drive source that rotates at least one of the second upper roll and the second lower roll; The film feed mechanism further comprises a transverse stretching machine that is disposed downstream of the feed mechanism and that transversely stretches the film and feeds it downstream. Effect of the Invention

[0009] According to one embodiment of the present disclosure, a film transporter that automatically feeds a film can be provided. [Brief description of the drawings]

[0010] [Figure 1] 1 is a schematic perspective view showing an overall configuration of a film conveying machine and a film manufacturing apparatus according to some embodiments. [Diagram 2] 3A to 3C are schematic side views illustrating the configuration and operation of a film feed mechanism according to some embodiments. [Diagram 3] 2 is a schematic perspective view showing a film feed mechanism and a clip device according to some embodiments. FIG. [Figure 4] FIG. 11 is a schematic perspective view showing a film feed mechanism and a clip device according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, specific embodiments will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. In addition, the following description and drawings are appropriately simplified for clarity of explanation.

[0012] <Overall configuration of film manufacturing equipment> First, the overall configuration of a film manufacturing apparatus including a resin film conveying machine according to the first embodiment will be described with reference to Fig. 1. Fig. 1 is a schematic perspective view showing the overall configuration of the film manufacturing apparatus according to the first embodiment.

[0013] The xyz orthogonal coordinates shown in FIG. 1 and other drawings are for the convenience of explaining the positional relationship of the components. Usually, the positive direction of the z axis is vertically upward, and the xy plane is a horizontal plane, which is common to all the drawings. In this specification, the film may be a resin film and may include a resin sheet.

[0014] As shown in Fig. 1, the film production apparatus 1 includes an extruder 10, a T-die 20, a cooler 30, a longitudinal stretching machine 40, a feed mechanism 70, a transverse stretching machine 50, and a winder 60. The film production apparatus 1 according to the first embodiment is an extrusion molding type film production apparatus that extrudes a film-like molten resin 82a from a gap between the lips of the T-die 20 connected to the extruder 10. Note that detailed portions of a first roll mechanism 71 and a second roll mechanism 72 are omitted in Fig. 1.

[0015] The extruder 10 shown in Fig. 1 is a screw-type extruder. In the extruder 10, a screw extending in the x-axis direction is housed inside a cylinder 11 extending in the x-axis direction. A hopper 13 for feeding resin pellets, which are the raw material of the resin film 83, is provided above the end of the cylinder 11 on the negative x-axis direction side.

[0016] The resin pellets supplied from the hopper 13 are transported from the base to the tip of the rotating screw, i.e., in the positive direction of the x-axis. The resin pellets are heated inside the cylinder 11 and are sheared and melted by the rotating screw, changing into molten resin 82.

[0017] Although not shown, for example, a motor is connected to the screw as a drive source via a reducer. A heater for heating the inside of the cylinder 11 is provided on the outer circumferential surface of the cylinder 11 over substantially the entire area in the longitudinal direction, and the resin pellets put into the cylinder 11 are heated.

[0018] As shown in Fig. 1, the T-die 20 is connected to the lower side of the tip end (the end on the x-axis positive side) of the extruder 10. A film-like molten resin 82a is extruded downward (z-axis negative direction) from a gap in a lip located at the lower end of the T-die 20. Here, the lip spacing of the T-die 20 can be adjusted. The lip spacing of the T-die 20 can be adjusted at multiple points along the longitudinal direction of the lip (y-axis direction) so that the thickness of the produced resin film 83 in the width direction (y-axis direction) is uniform.

[0019] As shown in FIG. 1, the cooling machine 30 includes cooling rolls CR1 to CR4. The cooling roll CR1 cools the film-like molten resin 82a extruded from the T-die 20, and delivers the resin film 83 formed by solidifying the film-like molten resin 82a to the cooling roll CR2. The cooling roll CR1 is also called a cast roll.

[0020] 1, the cooling rolls CR2 to CR4 transport the resin film 83 in this order while cooling it. Each of the cooling rolls CR1 to CR4 may be a driving roll driven by a driving source (not shown). The driving source is, for example, a variable speed motor such as a servo motor.

[0021] Each of the cooling rolls CR1 to CR4 may include a cooling mechanism for cooling the resin film 83. Each of the cooling rolls CR1 to CR4 may include a heating mechanism for heating the resin film 83. The cooling device 30 includes a plurality of drive rolls for transporting the resin film 83, and therefore can be one form of the film transport device according to this embodiment.

[0022] As shown in Fig. 1, the longitudinal stretching machine 40 stretches the resin film 83 discharged from the cooling machine 30 in the longitudinal direction while transporting the same. The longitudinal stretching machine 40 shown in Fig. 1 includes eleven rolls R1 to R11. Each of the rolls R1 to R11 is a driving roll driven by a driving source (not shown). The driving source is, for example, a variable speed motor such as a servo motor. The longitudinal stretching machine 40 is one form of a film transporting machine according to this embodiment.

[0023] The longitudinal stretching machine 40 may include a plurality of drive rolls for transporting the resin film 83, and the number and arrangement of the drive rolls included in the longitudinal stretching machine 40 may be appropriately determined. Each of the rolls R1 to R11 may include at least one of a cooling mechanism for cooling the resin film 83 and a heating mechanism for heating the resin film 83. The longitudinal stretching machine 40 may include one or more nip rolls for pressing the resin film 83 against any of the rolls R1 to R11. The nip roll is not a drive roll. In the film transport path, the region where the film is longitudinally stretched by the longitudinal stretching machine 40 is also called a longitudinal stretching region.

[0024] The feeding mechanism 70 automatically feeds the resin film 83 discharged from the longitudinal stretching machine 40 to the subsequent transverse stretching machine 50. Until now, since the longitudinal stretching machine 40 and the transverse stretching machine 50 have different feeding mechanisms, manual work by multiple people was required to feed the resin film 83 discharged from the longitudinal stretching machine 40 to the subsequent transverse stretching machine 50. However, since this work is troublesome and inefficient, in the present disclosure, a film feeding mechanism 70 having a function of gripping and feeding the film is newly provided. Details of this feeding mechanism 70 will be described later. The feeding mechanism 70 can be one form of the film conveying machine according to this embodiment.

[0025] The transverse stretching machine 50 stretches the resin film 83 discharged from the feed mechanism 70 in its width direction (y-axis direction). More specifically, the transverse stretching machine 50 includes a pair of rails RL1 and RL2. A large number of clips (not shown) are slidably arranged in parallel over the entire rails RL1 and RL2.

[0026] In FIG. 1, the arrows on the rails RL1 and RL2 indicate the movement direction of the clips. As shown in FIG. 1, the rails RL1 and RL2 have a loop structure with an outward path in which the clips move in the conveying direction of the resin film 83 (positive direction of the x-axis) and a return path in the opposite direction (negative direction of the x-axis). That is, in the transverse stretching machine 50, the clips go around along the rails RL1 and RL2 having the loop structure. Although not shown in FIG. 1, a clip closer (501 in FIG. 3 and FIG. 4) closes the tenter clips on the film. As shown in FIG. 1, the rails RL1 and RL2 have a symmetrical configuration with respect to a plane parallel to the xz plane.

[0027] 1, rails RL1 and RL2 are both provided substantially parallel to each other on the outward path proceeding in the conveying direction (positive direction of the x-axis) and the return path proceeding in the opposite direction (negative direction of the x-axis). The return path of rail RL1 is provided on the outer side in the width direction (negative direction of the y-axis) of resin film 83. The return path of rail RL2 is also provided on the outer side in the width direction (positive direction of the y-axis) of resin film 83.

[0028] As shown in Fig. 1, the outward paths of rails RL1 and RL2 have a pair of parallel portions parallel to the x-axis at both ends in the longitudinal direction (x-axis direction), and an inclined portion inclined in the y-axis direction between the parallel portions. The inclined portion of rail RL1 is inclined in the negative direction of the y-axis, and the inclined portion of rail RL2 is inclined in the positive direction of the y-axis. That is, in the inclined portions of the outward paths of rails RL1 and RL2, the distance between rails RL1 and RL2 in the y-axis direction becomes wider as the rails progress in the positive direction of the x-axis.

[0029] Here, in the outward path of rails RL1 and RL2 shown in Fig. 1, in the portion where the clips come into contact with resin film 83, the clips grip both ends of resin film 83 in the width direction (y-axis direction) and move in the positive x-axis direction along rails RL1 and RL2. Therefore, as shown in Fig. 1, in the oblique portion of the outward path of rails RL1 and RL2, resin film 83 is stretched in the width direction (y-axis direction) while being transported in the positive x-axis direction. On the other hand, in the parallel portion of the outward path of rails RL1 and RL2, resin film 83 is only transported in the positive x-axis direction and is not stretched in the width direction (y-axis direction).

[0030] The transverse stretching machine 50 shown in Fig. 1 has a drive source that drives clips for transporting the resin film 83. The drive source is, for example, a variable speed motor such as a servo motor. The transverse stretching machine 50 can be one form of the film transport machine according to the present embodiment.

[0031] The resin film 83 discharged from the transverse stretching machine 50 is wound up by the winding machine 60. The winding machine 60 is a driving roll driven by a driving source (not shown). The winding machine 60 may include a plurality of driving rolls driven by a driving source. In that case, the winding machine 60 may be one form of the film transport machine according to the present embodiment. In addition, the region in the film transport path where the film is transversely stretched by the transverse stretching machine 50 is also called a transverse stretching region.

[0032] As described above, in the film transport machine of this embodiment, some or all of the cooling machine 30, the longitudinal stretching machine 40, the feed mechanism 70, the transverse stretching machine 50, and the winding machine 60 may be one aspect of the film transport machine of this embodiment.

[0033] <Overall configuration of the feed mechanism> 2 is a schematic side view showing the configuration of the film feeding mechanism. As an example, the feeding mechanism 70 may be provided downstream of the longitudinal stretching machine 40 and upstream of the transverse stretching machine 50 in the film transport path.

[0034] The feed mechanism 70 grips the film fed from the longitudinal stretching machine 40, and then, while gripping the film, feeds it to the downstream transverse stretching machine 50. The feed mechanism 70 has a first roll mechanism 71 provided on the upstream side and a second roll mechanism 72 provided on the downstream side. The first roll mechanism 71 includes a first upper roll UR71 and a first lower roll LR71 provided upstream of the film transport path, a first vertical drive source that moves the first upper roll UR71 and the first lower roll LR71 relatively so that the first upper roll UR71 and the first lower roll LR71 approach each other, and a first rotation drive source that rotates at least one of the first upper roll UR71 and the first lower roll LR71.

[0035] In the example of FIG. 2, the first lower roll LR71 has a fixed height, and the first upper roll UR71 is lowered by a first vertical drive source (not shown) until it comes into contact with the first lower roll LR71. After the first upper roll UR71 and the first lower roll LR71 grip the film between them, the first upper roll UR71 is rotated counterclockwise by a rotation drive source, and the first lower roll LR71 is rotated clockwise by a rotation drive source. This causes the film to be sent downstream. In some embodiments, the first upper roll UR71 is rotated counterclockwise by a rotation drive source, and the first lower roll LR71 may be a free roll that does not have a rotation drive source.

[0036] The second roll mechanism 72 further includes a second upper roll UR72 and a second lower roll LR72 provided downstream of the film transport path, a second up-down drive source (725 in Figure 2) that moves the second upper roll UR72 and the second lower roll LR72 relatively so that the second upper roll UR72 and the second lower roll LR72 approach each other, and a second rotation drive source that rotates at least one of the second upper roll UR72 and the second lower roll LR72.

[0037] In the example of FIG. 2, the second upper roll UR72 is lowered by the vertical drive source 725 to the position of the film fed substantially horizontally, and the second lower roll LR72 is raised by the vertical drive source (not shown) to the position of the film (i.e., the lowered position of the second upper roll UR72). That is, the second upper roll UR72 comes into contact with the second lower roll LR72. After the second upper roll UR72 and the second lower roll LR72 grip the film, the second upper roll UR72 is rotated counterclockwise by the rotation drive source, and the second lower roll LR72 is rotated clockwise by the rotation drive source. This causes the film to be fed downstream. Note that in some embodiments, the second upper roll UR72 is rotated counterclockwise by the rotation drive source, and the second lower roll LR72 may be a free roll that does not have a rotation drive source.

[0038] In some embodiments, the lower base part L720 to which the second lower roll LR72 is fixed may be provided with an auxiliary lower roll SLR72 near the center downstream of the second lower roll LR72. Similarly, the upper base part U720 to which the second upper roll UR72 is fixed may be provided with an auxiliary upper roll SUR72 near the downstream of the second upper roll UR72. The auxiliary lower roll SLR72 and the auxiliary upper roll SUR72 come into contact with each other by the above-mentioned contact operation between the second upper roll UR72 and the second lower roll LR72. This allows the auxiliary lower roll SLR72 and the auxiliary upper roll SUR72 to help feed the film downstream. One or both of the auxiliary lower roll SLR72 and the auxiliary upper roll SUR72 may have a rotation drive source. Alternatively, both the auxiliary lower roll SLR72 and the auxiliary upper roll SUR72 may be free rolls that do not have a rotation drive source.

[0039] In some embodiments, the operation of lowering the first upper roll UR71 until it contacts the first lower roll LR71 may be followed by an operation of lowering the second upper roll UR72 to a position of the film fed substantially horizontally, and raising the second lower roll LR72 to a lowered position of the second upper roll UR72. In other embodiments, the operation of lowering the first upper roll UR71 until it contacts the first lower roll LR71 and the operation of lowering the second upper roll UR72 to a position of the film fed substantially horizontally, and raising the second lower roll LR72 to a lowered position of the second upper roll UR72 may be started substantially simultaneously.

[0040] In some embodiments, a meandering detection unit 90 (e.g., various sensors such as a camera, laser sensor, edge sensor, etc.) that detects meandering of the film may be provided as shown in Fig. 2. In other embodiments, a wrinkle detection unit 7121 (e.g., a camera or edge sensor) that detects wrinkles in the film may be provided on the upper base unit U720 as shown in Fig. 2. A detailed description of the meandering correction operation and wrinkle removal operation based on the detection results will be given later.

[0041] In some embodiments, the first upper roll UR71 may be provided with a static eliminator 718 for removing static electricity from the film. The static eliminator 718 may be, for example, a voltage application type static eliminator, and may be composed of an electrode needle, a high-voltage power supply, and an earth. If the target film is positively charged, the static eliminator 718 can neutralize the charge by generating negative ions and striking them against the film. Conversely, if the film is negatively charged, the static eliminator 718 can neutralize the charge by generating positive ions and striking them against the film. Note that static eliminators of various known configurations may also be used.

[0042] FIG. 3 is a schematic perspective view showing a film feeding mechanism and a clip device according to some embodiments. When the longitudinal stretching machine 40 (FIG. 1) sends the film to the clip closer 501 of the transverse stretching machine 50, the first upper roll UR71 and the first lower roll LR71 of the first roll mechanism 71 grip the film. The clip closers 501, 501 close clips on both ends of the film gripped by the first upper roll UR71 and the first lower roll LR71, respectively. Then, The first upper roll UR71 and the first lower roll LR71 of the first roll mechanism 71 feed the film to the second upper roll UR72 and the second lower roll LR72 of the second roll mechanism 72. After gripping the film, the second upper roll UR72 and the second lower roll LR72 can feed the film downstream.

[0043] In this way, the feed mechanism 70 can assist the clip closer in the clipping action for transverse stretching, thereby eliminating the need for manual work by multiple people and enabling smooth transport of the film.

[0044] <Other embodiments> FIG. 4 is a schematic perspective view showing a film feeding mechanism and a clip device according to another embodiment. In another embodiment, the second upper roll UR72 of the second roll mechanism 72 may include a second upper left roll LUR72 and a second upper right roll RUR72. Also, the second lower roll LR72 of the second roll mechanism 72 may include a second lower left roll LLR72 and a second lower right roll RLR72. Although not shown, the second roll mechanism 72 further includes an upper left rotation drive source that rotates the second upper left roll LUR72, an upper right rotation drive source that rotates the second upper right roll RUR72, a lower left rotation drive source that rotates the second lower left roll LLR72, and an upper right rotation drive source that rotates the second lower right roll RLR72. Specifically, the upper left rotation drive source can rotate the second upper left roll LUR72 counterclockwise at a first rotation number. The upper right rotation drive source can rotate the second upper right roll RUR72 counterclockwise at a second rotation number. The lower-left rotary drive source can rotate the second lower-left roll LLR 72 clockwise at a third rotation speed. The upper-right rotary drive source rotates the second lower-right roll RLR 72 clockwise at a fourth rotation speed. The control unit can independently control the rotation speeds of the upper-left rotary drive source, upper-right rotary drive source, lower-left rotary drive source, and upper-right rotary drive source.

[0045] In some embodiments, as shown in FIG. 2, a wrinkle detector 7121 (e.g., a camera or edge sensor) that detects wrinkles in the film 83 may be provided above the film 83 being fed (e.g., below the upper base unit U720). In other embodiments, the wrinkle detector 7121 may be provided in a location (e.g., a ceiling) away from the upper base unit U720, between the longitudinal stretching machine 40 and the upper base unit U720. The control unit can adjust the gripping force of the film by the vertical drive source 725 based on the captured image of the film (i.e., the wrinkle detection result). Furthermore, the control unit can separately change the rotation speed of the second upper left roll LUR72 and the second upper right roll RUR72 by the independent left and right rotation drive source according to the position of the wrinkles in the film based on the captured image of the film. This makes it possible to remove wrinkles in the film.

[0046] In another embodiment, the second roll mechanism 72 may include a third vertical drive source that relatively moves the second upper left roll and the second lower left roll so that the second upper left roll LUR72 and the second lower left roll LLR72 approach each other, and a fourth vertical drive source that relatively moves the second upper right roll and the second lower right roll so that the second upper right roll RUR72 and the second lower right roll RLR72 approach each other. The control unit can adjust the gripping force of the film by the third vertical drive source and the gripping force of the film by the fourth vertical drive source, based on the detection result (position of the wrinkles) of the wrinkle detection unit 7121.

[0047] In some embodiments, as shown in FIG. 2, a meandering detection unit 90 may be provided above the film 83 sent from the longitudinal stretching machine 40. When the meandering detection unit 90 detects the meandering of the film, the second roll mechanism 72 can change the rotation speed of the left and right independent rotation drive sources while adjusting the gripping force of the film by the vertical drive source 725 with respect to the film 83 based on the detection result (i.e., the direction of the meandering). For example, if the film meanders to the left with respect to the traveling direction, the rotation speed of the right rotation drive source may be increased more than the rotation speed of the left rotation drive source. In other embodiments, the control unit can adjust the gripping force of the film by the third vertical drive source and the gripping force of the film by the fourth vertical drive source based on the detection result (the direction of the meandering) of the meandering detection unit 90. This makes it possible to correct the meandering of the film and appropriately perform the subsequent transverse stretching.

[0048] The operation of the second roll mechanism 72 is controlled by a control unit (not shown). The control unit receives sensor signals from various sensors such as the meandering detection unit 90, and can control various drive units related to the second roll mechanism 72, etc., to be driven based on the sensor signals. The control unit can execute various controls based on various programs stored in the storage unit, and is realized by a central processing unit (CPU), a read-only memory (ROM), a random access memory (RAM), an input / output port (I / O), etc.

[0049] In the above examples, the program includes instructions (or software code) that, when loaded into a computer, cause the computer to perform one or more functions described in the embodiments. The program may be stored on a non-transitory computer-readable medium or a tangible storage medium. By way of example and not limitation, the computer-readable medium or tangible storage medium includes random-access memory (RAM), read-only memory (ROM), flash memory, solid-state drive (SSD) or other memory technology, CD-ROM, digital versatile disc (DVD), Blu-ray® disk or other optical disk storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage device. The program may be transmitted on a transitory computer-readable medium or communication medium. By way of example and not limitation, the transitory computer-readable medium or communication medium includes electrical, optical, acoustic, or other forms of propagated signals.

[0050] The invention made by the present inventor has been specifically described above based on an embodiment, but it goes without saying that the present invention is not limited to the embodiment already described, and various modifications are possible without departing from the gist of the invention.

[0051] In some embodiments, there may be provided a film transport method for transporting a film from upstream to downstream using a feed mechanism including a first upper roll and a first lower roll provided upstream of a film transport path, a first vertical drive source that moves the first upper roll and the first lower roll relatively so that the first upper roll and the first lower roll approach each other, a first rotation drive source that rotates at least one of the first upper roll and the first lower roll, a second upper roll and a second lower roll provided downstream of the film transport path, a second vertical drive source that moves the second upper roll and the second lower roll relatively so that the second upper roll and the second lower roll approach each other, and a second rotation drive source that rotates at least one of the second upper roll and the second lower roll. In the film transport method, the first upper roll and the first lower roll are brought closer together by the first up and down drive source to grip the film, and the first rotation drive source sends the gripped film downstream, the second upper roll and the second lower roll are brought closer together by the second up and down drive source to grip the fed film, and the second rotation drive source sends the gripped film downstream.

[0052] In another embodiment, the present invention includes an extruder that melts and extrudes an input resin raw material, a die connected to the extruder that forms the molten resin into a film, a cooling roll that cools the film-like molten resin extruded from the die and carries out a resin film in which the molten resin has solidified, a longitudinal stretching machine that is provided downstream of the cooling roll and longitudinally stretches the film and sends it downstream, a first upper roll and a first lower roll that are provided upstream of a film transport path, and a first vertical drive that moves the first upper roll and the first lower roll relatively so that the first upper roll and the first lower roll approach each other. a first rotary drive source that rotates at least one of the first upper roll and the first lower roll, a second upper roll and a second lower roll provided downstream of a transport path for the film, a second up-down drive source that moves the second upper roll and the second lower roll relatively so that the second upper roll and the second lower roll approach each other, and a second rotary drive source that rotates at least one of the second upper roll and the second lower roll, and a transverse stretching machine that is provided downstream of the feed mechanism and laterally stretches the film and feeds it downstream. [Explanation of symbols]

[0053] 1. Film manufacturing equipment 10 Extruder 11 Cylinders 13 Hopper 20 T die 30 Cooler 40 Longitudinal stretching machine 50 Lateral stretching machine 60 Winder 70 Feeding mechanism 71 First roll mechanism 72 Second roll mechanism 82a Molten Resin 83 Film 90 Meandering detection unit 500 Clip device 501 Clip Closer 718 Static eliminator 725 Lifting mechanism 7121 Wrinkle detection unit CR1~CR4 Cooling roll R1~R11 Role RL1, RL2 rails UR71 1st upper roll LR71 1st Lower Roll UR72 2nd upper roll LR72 Second Lower Roll RUR72 2nd upper right roll LUR72 2nd upper left roll RLR72 2nd lower right roll LLR72 2nd Lower Left Roll

Claims

1. A film transporter that transports a film from upstream to downstream, a first upper roll and a first lower roll provided upstream of a film transport path; a first vertical drive source that moves the first upper roll and the first lower roll relatively so that the first upper roll and the first lower roll approach each other; a first rotary drive source that rotates at least one of the first upper roll and the first lower roll; a second upper roll and a second lower roll provided downstream of the film transport path; a second vertical drive source that moves the second upper roll and the second lower roll relatively so that the second upper roll and the second lower roll approach each other; a second rotary drive source that rotates at least one of the second upper roll and the second lower roll; a feed mechanism including A film transport machine comprising:

2. the feed mechanism causes the first upper roll and the first lower roll to approach each other by the first vertical drive source to grip the film, and feeds the gripped film downstream by the first rotation drive source; The second upper roll and the second lower roll are moved closer to each other by the second vertical drive source, and the fed film is gripped, and the gripped film is fed downstream by the second rotation drive source. The film transporter according to claim 1 .

3. a longitudinal stretching machine provided in a longitudinal stretching region upstream of the feed mechanism, which longitudinally stretches the film and transports it downstream; The film transporter according to claim 1 , further comprising a transverse stretching machine provided in a transverse stretching region downstream of the feed mechanism, which transversely stretches the film and transports it downstream.

4. the second upper roll includes a second upper left roll and a second upper right roll, and the second lower roll includes a second lower left roll and a second lower right roll; an upper left rotation drive source that rotates the second upper left roll; an upper right rotation drive source that rotates the second upper right roll; a lower left rotation drive source that rotates the second lower left roll; a right lower rotation drive source that rotates the second right lower roll; 2. The film transport device according to claim 1, further comprising: a control unit that controls the rotation speeds of the upper left rotation drive source, the upper right rotation drive source, the lower left rotation drive source, and the lower right rotation drive source.

5. A meandering detection unit that detects meandering of the film is further provided, 5. The film transport machine of claim 4, wherein when the meandering is detected by the meandering detection unit, the control unit controls the rotational speeds of the upper-left rotation drive source, the upper-right rotation drive source, the lower-left rotation drive source, and the upper-right rotation drive source based on the detection result so as to correct the meandering of the film.

6. a vertical drive source that moves the second upper left roll and the second lower left roll relatively so that the second upper left roll and the second lower left roll approach each other; a vertical drive source that moves the second upper right roll and the second lower right roll relatively so that the second upper right roll and the second lower right roll approach each other; The film transport of claim 4 , comprising:

7. The film transporter according to claim 1 , wherein the first upper roll has a static eliminator for eliminating static electricity between the first upper roll and the film.

8. a first upper roll and a first lower roll provided upstream of a film transport path; a first vertical drive source that moves the first upper roll and the first lower roll relatively so that the first upper roll and the first lower roll approach each other; a first rotary drive source that rotates at least one of the first upper roll and the first lower roll; a second upper roll and a second lower roll that are provided downstream of a transport path of the film; a second vertical drive source that moves the second upper roll and the second lower roll relatively so that the second upper roll and the second lower roll approach each other; and a second rotary drive source that rotates at least one of the second upper roll and the second lower roll, the first upper roll and the first lower roll are moved closer to each other by the first vertical drive source to grip the film, and the first rotation drive source feeds the gripped film downstream; A film transport method in which the second upper roll and the second lower roll are brought closer together by the second up-and-down drive source to grip the fed film, and the gripped film is fed downstream by the second rotation drive source.

9. an extruder that melts and extrudes the input resin raw material; a die connected to the extruder for forming the molten resin into a film; a cooling roll that cools the film-like molten resin extruded from the die and carries out a resin film in which the molten resin has solidified; a longitudinal stretching machine provided downstream of the cooling roll for longitudinally stretching the film and feeding the film downstream; a first upper roll and a first lower roll provided upstream of a film transport path; a feed mechanism including: a first vertical drive source that moves the first upper roll and the first lower roll relatively so that the first upper roll and the first lower roll approach each other; a first rotary drive source that rotates at least one of the first upper roll and the first lower roll; a second upper roll and a second lower roll that are provided downstream of a transport path of the film; a second vertical drive source that moves the second upper roll and the second lower roll relatively so that the second upper roll and the second lower roll approach each other; and a second rotary drive source that rotates at least one of the second upper roll and the second lower roll; a transverse stretching machine that is provided downstream of the feeding mechanism and that transversely stretches the film and feeds it downstream.

Images