JP2020001856A - Paper feeding device, film manufacturing device and microporous membrane manufacturing device, film feeding method and microporous membrane manufacturing method - Google Patents

Abstract

To prevent a string and a film used for inserting the string from dropping from a shaft end of a conveying roller even during conveying the film in a liquid when inserting the string between multiple rollers before inserting the film between the multiple conveying rollers.SOLUTION: A paper feeding device comprises: multiple sprockets 21 which are provided in respective areas outward away from both ends of conveying rollers 11 with respect to a convey area where a film is conveyed by the multiple conveying rollers 11 and which causes chains 22 to run along a conveying path of the film; a string insertion bar 25 attached to the chain 22 and extending toward the conveying area of the film; and a fixing part 26 provided at a tip of the string insertion bar 25, to connect a string to be inserted, with the string insertion bar 25.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a technique of passing a string between a plurality of transport rolls prior to an operation of passing a film when a film is passed between a plurality of transport rolls.

  Conventionally, when producing a microporous membrane used for a secondary battery separator, for example, a polyolefin resin and a plasticizer are melt-kneaded to form a film, and after stretching the obtained film, the plasticizer is washed with a cleaning liquid. Then, the washing liquid is dried to obtain a microporous membrane. In passing through each of these steps, as a method for transporting a film or a microporous film, for example, a plurality of transport rolls are used as a general technique.

  When the film is transported by a plurality of transport rolls, string passing and film passing are performed before the production of the film is started. The stringing operation is to pass a string between a plurality of transport rolls along the transport path from the upstream side to the downstream side of the film transport path. Then, the leading end of the film being manufactured is connected to the upstream end in the transport direction of the string passed between the plurality of transport rolls, and the string is pulled downstream in the transport direction of the film, whereby the film is transported to a plurality of transport rolls. The paper is passed between them (film passing is performed). Producing a film using such a stringing is particularly when producing the above-described microporous membrane, because the gel sheet discharged from the die is wet with liquid paraffin serving as a plasticizer. This is effective because suction conveyance is not possible.

  As such a paper passing device, there is disclosed a technology in which a rope is stretched on a grooved guide roll attached to one end of each of a plurality of transport rolls, and a string is directly connected to the rope to pass the string. Is disclosed. In this technique, when the rope runs along with the rotation of the grooved guide roll, the string connected to the rope is pulled, and the paper is passed between the transport rolls.

  Further, in the case where the film is transported between a plurality of transport rolls as described above, the technology of manufacturing a laminated film by transporting the film so that the film passes through a tank containing a liquid, It is disclosed in Patent Document 2. The technique of transporting the film so that the film passes through the tank containing the liquid in the technique of manufacturing a microporous membrane as described above is a washing tank for removing a plasticizer from a polyolefin resin. It is used because it needs to pass through.

JP-A-3-264453 JP 2014-199277 A

  However, as in the technique disclosed in Patent Document 1, a rope is stretched on a grooved guide roll attached to one end of each of a plurality of transport rolls, and a string is directly connected to the rope to perform stringing. In this case, the string is pulled to one end side where the grooved roll of the transfer roll is attached, and the string or the film connected to the string is dropped on the shaft end of the transfer roll and bites into the drive unit of the roll. There is a problem that the paper is jammed or cannot be transported to the next transport roll. In other words, the transport roll has a central portion in the length direction having a larger diameter to obtain an arbitrary rotation speed, while both end portions are formed to have a smaller diameter than the central portion to obtain a bearing and a driving force. ing. Therefore, the stringing needs to be performed at the central portion from the upstream end to the downstream end of the film transport path. In particular, in producing a microporous membrane, it is difficult to control the tension of the string in the middle because the transport distance of the film is long, so it can be said that the position of the string in the length direction of the transport roll is extremely difficult to adjust.

  Further, as in the technique disclosed in Patent Document 2, when the film is transported so that the film passes through a tank containing the liquid, the film can be transported by suction or extruded with air. In addition, when the liquid is composed of a chemical solution, it cannot be manually conveyed. In addition, even when the above-described string passing is used, when the string is light, the string may float in the liquid and meander, and even if the string is heavy, the string may flow if the tension in the washing tank is not increased. There is a problem. Further, in the technique for manufacturing a microporous membrane as described above, when a film is passed through a cleaning tank, there is a problem that it is difficult to control the tension of the string because the path in the cleaning tank is long.

  The present invention has been made in view of the above-described problems of the related art, and performs stringing between a plurality of transport rolls prior to an operation of passing a film between a plurality of transport rolls. In this regard, it is an object of the present invention to provide a technique capable of preventing a string or a film used for stringing from dropping from a shaft end of a transport roll even when the film is transported in a liquid.

That is, the present invention
Used in a film transport apparatus having a plurality of transport rolls for transporting a film, and when passing a film between the plurality of transport rolls along the transport path thereof, passing the film between the plurality of transport rolls. A paper passing device that performs stringing between a plurality of transport rolls prior to a paper forming operation,
A guide member that is provided in an area away from one end of the transport roll to an outer side with respect to a transport area where the film is transported by the plurality of transport rolls, and causes a linear guide member to travel along a transport path of the film,
A rod-shaped member provided on the line-shaped guide member and extending toward the transport region,
The paper passing device is provided with a fixing portion for connecting the string for string passing to the rod-shaped member at an end of the rod-shaped member on the side of the transport area.

The present invention also provides a paper passing device of the present invention,
A processing tank in which a processing liquid is stored,
The transport roll is a film manufacturing apparatus arranged in the processing bath so that the film is transported in the processing liquid.

Also, the present invention, a kneading machine for obtaining a resin solution by kneading a resin and a plasticizer,
A die for discharging the resin solution into a gel sheet,
A cooling device for cooling the resin solution discharged into a gel sheet to obtain a film,
A stretching device for stretching the film,
Film production apparatus of the present invention for obtaining a microporous film by removing the plasticizer from the stretched film,
An apparatus for manufacturing a microporous membrane, comprising: a winding section for winding the microporous membrane.

Further, the present invention is used in a film transport device having a plurality of transport rolls for transporting a film, when passing a film between the plurality of transport rolls along the transport path of the film, the film is the plurality of A film passing method using a paper passing device that performs string passing between a plurality of transport rolls prior to an operation of passing a film between transport rolls,
Extending toward a film transport area of a rod-shaped member provided in a linear guide member disposed in a region outwardly separated from one end of the transport roll with respect to a transport area in which a film is transported by the plurality of transport rolls. Connecting one end of the string to the tip
Run the linear guide member along the film transport path, pull out one end of the string toward the downstream side of the film transport path, and move the other end of the string to the upstream side of the film transport path. Waiting and waiting;
After the one end of the string is pulled out to the downstream side of the film transport device, stopping the linear guide member, separating the one end of the string from the rod-shaped member,
Fixing the leading end of the film to the other end of the string, further pulling out one end of the string, and threading the film between the plurality of transport rolls.

Further, the present invention, a step of adjusting the polyolefin solution by kneading a polyolefin resin and a plasticizer,
Cooling the polyolefin solution to form a gel sheet as the film,
A step of passing the gel sheet through a film in a washing tank to remove a plasticizer, and a step of performing the step using the film passing method,
Winding the microporous membrane from which the plasticizer has been removed through the washing tank.

  According to the present invention, when a string is passed through a plurality of transport rolls prior to a work of passing a film between a plurality of transport rolls, even when the film is transported in a liquid, a string used for the threading is used. And the film can be prevented from dropping from the shaft end of the transport roll.

It is a side view showing one embodiment of a film conveyance device using a paper feed device of the present invention. FIG. 4 is a plan view showing a horizontal positional relationship between a transport roll, a sprocket, a chain, and a string passing rod attached to the chain in the film transport device of the present invention. FIG. 3 is a perspective view showing a detailed structure of a chain of the film transport device of the present invention. It is a side view for explaining composition near the tip of a string passing stick in a film conveyance device of the present invention. It is a top view for explaining film threading in a film conveyance device of the present invention, and stringing performed prior to it. It is a top view for explaining film threading in a film conveyance device of the present invention, and stringing performed prior to it. It is a top view for explaining film threading in a film conveyance device of the present invention, and stringing performed prior to it. It is a top view for explaining film threading in a film conveyance device of the present invention, and stringing performed prior to it. It is a top view for explaining film threading in a film conveyance device of the present invention, and stringing performed prior to it. It is a longitudinal section showing an example of a film manufacturing device to which a film conveying device of the present invention is applied. It is a longitudinal section showing roughly composition of the inside of a washing tank in a film manufacturing device of the present invention. It is the top view which looked at the washing tank in the film manufacturing device of the present invention from the upper part.

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

  FIG. 1 is a diagram showing one embodiment of a film transport device using a paper passing device of the present invention, and is a diagram viewed from a side. FIG. 2 is a diagram showing a horizontal positional relationship between the transport roll 11 shown in FIG. 1, the sprocket 21, the chain 22, and the string passing rod 25 attached to the chain 22. In FIGS. 1 and 2, only members necessary for describing the present invention are drawn, and other members are omitted.

  In this embodiment, as shown in FIGS. 1 and 2, a plurality of transport rolls 11 are provided so that the film is transported while moving up and down from left to right in FIG. This is a film transport device 1 provided with a plurality of sprockets 21 so as to run a chain 22 through the chain. As will be described later, the chain 22 is disposed at the right end in FIG. 1 via the lower area toward the left side (upstream end of the film transport path 12) and is connected to the chain 22 at the upstream end to form an endless shape. (Arc shape).

  As shown in FIG. 2, each of the transport rolls 11 has a wider width than the film to be transported, and is arranged in parallel with each other to form a transport path 12 for the film. The film is conveyed along the conveyance path 12 by rotating around the horizontal axis with the rotation of. That is, each transport roll 11 is formed so that the central part in the length direction is larger than the width dimension of the film, and the both ends are configured to be smaller in diameter than the central part to form the drive shaft 13. Have been.

  The sprocket 21 serves as a guide member in the present invention. The sprocket 21 is provided in a region that is located outside the transport region where the film is transported by the transport roll 11 and is more outward than both ends of the transport roll 11, and when viewed from the side (in the length direction of the transport roll 11). It is arranged along the film transport path 12 (when viewed from one end side to the other end side). The sprocket 21 is configured to rotate around a horizontal axis with rotation of a drive shaft 24 by a motor described later.

  The chain 22 serves as a linear guide member in the present invention. The chain 22 is made of a corrosion-resistant metal such as SUS (stainless steel) and meshes with the sprocket 21 so that the chain 22 travels more outwardly than the transport path 12 along the transport path 12 of the film as the sprocket 21 rotates. Travel around the horizontal axis. When returning from the downstream side to the upstream side of the film transport path 12, the chain 22 is endless so as to pass below the region where the transport roll 11 is disposed. As shown in FIG. 3, the chain 22 has a mounting portion 25a mounted on the inside thereof. The attachment portion 25a is L-shaped, and has a hole for attaching the string passing rod 25 serving as a rod-shaped member as shown in FIG. , For example, at three locations. The sprocket 21 and the chain 22 described above are arranged on only one of the two ends of the transport roll 11, as shown in FIG. Although the string passing rod 25 is actually firmly fixed to the mounting portion 25a using a hook or a screw, the drawing of the hook or the screw is omitted in FIG.

  FIG. 4 is a view for explaining the configuration near the tip of the string passing rod 25 shown in FIG. The string passing rod 25 is made of a rod-shaped member having elasticity and corrosion resistance (chemical resistance), such as carbon, and one end is attached to the attachment portion 25a of the chain 22, and the other end is a film. To the transfer area. The string passing rod 25 has a length from a surface of the chain 22 facing the transport roll 11 to a central portion in the length direction of the transport roll 11, and as shown in FIG. The distal end has a fixing portion 26 for connecting a string for string passing to be described later.

  In addition, the number of the transport rolls 11 and the sprockets 21 is not limited to the illustrated one, and may be a plurality.

  In the film transport apparatus 1 configured as described above, stringing is performed between the transport rolls 11 prior to the operation of passing the film between the transport rolls 11 along the transport path 12 thereof. Note that the sprocket 21, the chain 22, and the string passing rod 25 described above constitute a paper passing device of the present invention.

  Hereinafter, the film threading and the stringing performed prior to the film threading in the film transport device 1 will be described.

  FIGS. 5 to 10 are diagrams for explaining the film threading and the stringing performed prior to the film threading in the film transporting device 1 shown in FIGS. 1 to 4. The film transporting device 1 shown in FIG. FIG.

  In the stringing, first, as shown in FIG. 5, the chain 22 is driven such that the stringing rod 25 of the chain 22 is located on the upstream side of the film transport device 1. Next, one end of the rubber sheet 53 is tied to the fixing portion 26 at the tip of the string passing rod 25, and the other end of the rubber sheet 53 is attached to the tip of the string 51 wound as the ball winding string 31 to be a reel. Connected and fixed by tying in the film transport area. The rubber sheet 53 may be made of an elastic material such as a resin spring or the like. In addition, a string different from the string 51 is actually interposed between the fixing portion 26 and the rubber sheet 53, but the description is omitted here.

  After the string 51 is connected to the fixing portion 26 of the string passing rod 25 via the rubber sheet 53, the sprocket 21 and the transport roll 11 are driven to rotate, so that the transport roll 11 is rotated and the chain 22 is moved along the transport path of the film. Run along No. 12. Then, as shown in FIG. 6, since the threading rod 25 has flexibility, and furthermore, the rubber sheet 53 is interposed between the string 51 and the threading rod 25, 25 is bent, or the rubber sheet 53 expands and contracts, whereby the tip of the string 51 is pulled out toward the downstream side of the film transport path 12 while the tension of the string 51 is adjusted. As described above, since the fixing portion 26, which is the distal end of the string passing rod 25, is located at the center in the length direction of the transport roll 11, the string 51 is pulled out at the center of the transport path 12. It is. At that time, the trailing end of the string 51 stands by on the upstream side of the film transport path 12 while being wound as the ball wound string 31. The reason why the transport roll 11 is driven when the string is passed is to assist the function of the chain 22 that transports the second string 52 to the downstream side in the transport direction of the film.

  As the chain 22 travels along the film transport path 12 and the leading end of the string 51 is pulled out toward the downstream side of the film transport path 12, the chain 22 moves as described above. Since the vehicle travels more outwardly than 12, the drawn string 51 is threaded between the rolls 11 as shown in FIG. At this time, since the chain 22 travels more outward than the film transport path 12, the rotation speed of the transport roll 11 and the rotation speed of the sprocket 21 are such that the string 51 moves on the transport roll 11 by the travel of the chain 22. They are different from each other so as to correspond to the speed at which they are conveyed.

  After the leading end side of the string 51 is pulled out to the downstream side of the film transport device 1, the rotation of the transport roll 11 is stopped, and the rotation of the sprocket 21 is stopped, so that the running of the chain 22 is stopped. 53 is separated from the fixing portion 26 of the string passing rod 25. Then, as shown in FIG. 8, the front end of the film 4 to be conveyed by the film conveyance device 1 is connected to and fixed to the rear end side of the string 51 (the end on the upstream side in the conveyance direction of the film). The string 51 is pulled out to the downstream side of the film transport path 12 while rotating the roll 11. At this time, the string 51 may be pulled out manually or the end of the string 51 may be fixed to a winder and wound up by a winder.

  Then, as shown in FIG. 9, since the leading end of the film 4 is fixed to the rear end side of the string 51, the film 4 is passed through the transport roll 11 through which the string 51 is passed. At this time, each of the transport rolls 11 has a width wider than the film to be transported, and the cord 51 is pulled out to the downstream side of the transport path 12 of the film at the central portion of the transport roll 11. Then, the film is passed through the film at the central portion of the transport roll 11. That is, a region having a predetermined width in the central portion of the transport roll 11 is a film transport region.

  As described above, in the paper passing device used in the film transport device 1 of the present embodiment, the chain 22 runs on only one of the right and left sides with respect to the transport region where the film is transported. 25 are provided. For this reason, the chain 22 is caused to travel along the film transport path 12 in a state where the distal end of the string 51 is connected to and fixed to the fixing portion 26 provided at the distal end of the string passing rod 25, so that the string 51 is transported on the transport roll. 11 can be threaded. Therefore, since the film can be threaded by fixing the leading end of the film to the rear end of the string 51 and pulling it out, the string 51 or the film may drop on the shaft end of the transport roll 11 and bite, Is prevented from being transported to the transport roll 11. In particular, even when the transport path of the film is long, the string 51 or the film may drop onto the shaft end of the transport roll 11 and bite, or may not be transported to the next transport roll 11. Can be avoided. Furthermore, since a constant tension is applied to the string 51 as the chain 22 travels along the film transport path 12, even when the film is transported in a liquid, the string 51 or the film used for threading may be used. Can be prevented from dropping from the shaft end of the transport roll 11.

  Since the string passing rod 25 is made of a flexible material, even if tension is applied to the string 51, the string passing rod 25 can absorb the tension. Can be threaded without tearing. Further, since the rubber sheet 53 is interposed between the string passing rod 25 and the string 51, the rubber sheet 53 can be further absorbed even when the tension is applied.

  Hereinafter, an example in which the above-described film transport apparatus is applied to a film manufacturing apparatus will be described. As such a film manufacturing apparatus 2, for example, as shown in FIGS. 10 to 12, there is a film manufacturing apparatus 2 that manufactures a film by transporting the film in cleaning tanks 40 a to 40 c serving as a plurality of processing tanks.

  FIG. 10 is a longitudinal sectional view showing an example of a film manufacturing apparatus to which the film transport device 1 shown in FIGS. 1 to 4 is applied. FIG. 11 is a diagram showing the internal configuration of the cleaning tanks 40a to 40b shown in FIG. FIG. 12 is a view of the cleaning tanks 40a to 40c shown in FIG. 10 as viewed from above.

  In the film manufacturing apparatus 2 shown in FIGS. 10 to 12, the film is transported by the film transport apparatus 1 shown in FIGS. 1 to 4, but the transport roll 11 and the sprocket are also provided in the cleaning tanks 40 a to 40 c. 21 is provided, the film is transported along a transport path 12 formed by the transport roll 11, and a chain 22 meshed with the sprocket 21 is moved along the transport path 12 of the film in the cleaning tanks 40 a to 40 c. Will run.

  Each of the cleaning tanks 40a to 40c is provided on the side surface thereof with a check window 41 for allowing the chain 22 to be visually recognized from the outside in an airtight manner. Through this check window 41, the running of the chain 22 can be checked from the outside. it can. Further, a ceiling wall 43 is provided on the top surface of the cleaning tanks 40a to 40c to make the inside of the cleaning tanks 40a to 40c airtight. Each of the ceiling walls 43 is provided with a confirmation window 42 that allows the chain 22 to be visually recognized from outside, and the traveling of the chain 22 can be confirmed from outside through the confirmation window 42. On the ceiling wall 43, a motor 23 serving as a driving unit for driving the sprocket 21 is provided. In the cleaning tanks 40a to 40c configured as described above, the processing liquids 3 each including an organic solvent such as methylene chloride are stored and stirred.

  Also in the film manufacturing apparatus 2 in this example, when the chain 22 returns from the downstream side to the upstream side of the film transport path 12, the chain 22 is located below the area where the transport rolls 11 are arranged, for example, the cleaning tanks 40 a to 40 c. Is passed downstairs. Note that the length of the transport path 12 of the film formed by the plurality of transport rolls 11 is preferably 20 to 100 times the width of the transport rolls 11.

  In the film manufacturing apparatus 2 configured as described above, in the order of the cleaning tanks 40a to 40c, after the above-described string passing is performed, the film passing is performed, and the film is transported. On the upstream side of the film transport path 12 in the cleaning tank 40a, the above-described ball winding string 31 is provided.

  Hereinafter, a method for manufacturing a microporous membrane in a microporous membrane manufacturing apparatus including the film manufacturing apparatus 2 configured as described above will be described.

  First, using a kneader such as a twin-screw extruder, at a temperature at which the polyolefin resin melts, for example, a liquid paraffin as a plasticizer is kneaded with the polyolefin resin to prepare a polyolefin solution.

  Next, the polyolefin solution is discharged from the die into a gel sheet, and the gel sheet is cooled using a cooling device such as a chill roll to obtain a film. Thereafter, the film is stretched in the machine direction and the transverse direction using a simultaneous biaxial stretching device or a sequential biaxial stretching device.

  Next, as described above, string passing is performed between the transport rolls 11 that transport the film in the cleaning tanks 40a to 40c. Subsequently, the film is passed through the above-described cleaning tanks 40a to 40c.

  As described above, the cleaning tanks 40a to 40c contain the processing liquids 3 made of an organic solvent such as methylene chloride, respectively. Therefore, by passing the film through the cleaning tanks 40a to 40c, The contained plasticizer is removed to obtain a microporous membrane.

  Next, the microporous membrane from which the plasticizer has been removed is dried in the cleaning tanks 40a to 40c, and is wound around a roll by a winding unit such as a winder.

  In the film manufacturing apparatus 2 described above, the same effects as those of the film transport apparatus 1 shown in FIGS. 1 to 4 can be obtained, but in particular, since the film is transported in the processing liquid 3, it is effective. It becomes something. That is, in the liquid, the string 51 is easily lifted by the buoyancy or meandering of the string 51 by the flow of the liquid. However, the position of the string 51 in the length direction of the transport roll 11 is regulated to the center by the string passing rod 25 and the tension is applied. , Stringing can be reliably performed even if the transport path is long in the liquid. Then, by using the chain 22 and the sprocket 21, only such a simple configuration (the chain 22, the sprocket 21, and the string passing rod 25) is immersed in the processing liquid while preventing the worker from touching the processing liquid. Thus, stringing and film threading can be performed more easily than when a large-sized automatic film threading device is used. At this time, since the string passing rod 25 moves in the processing liquid 3 as the chain 22 travels, it is preferable that the string passing rod 25 be formed of a resin or the like having chemical resistance.

  Further, as described above, since the ceiling walls 43 provided with the confirmation windows 42 are provided on the top surfaces of the cleaning tanks 40a to 40c, the processing liquid 3 contained in the cleaning tanks 40a to 40c is volatilized. In addition, the running of the chain 22 can be confirmed without the operator touching the processing liquid 3 while preventing the chain 22 from running.

  Further, when the chain 22 returns from the downstream side to the upstream side of the film transport path 12, the chain 22 passes below the region where the transport rolls 11 are arranged, so that the chain 22 is disposed in the cleaning tank 40 a. Since the chain 22 passes downstairs with respect to 40c, the chain 22 can be configured to return from the downstream side of the film transport path 12 to the upstream side via the shortest path. The chain 22 may be configured to reciprocate between the upstream side and the downstream side of the film transport path 12 instead of the endless shape. The control becomes easy, for example, there is no need to switch the running direction of the chain 22 according to the transport state of the vehicle.

  Here, a difference between each of Patent Literatures 1 and 2 described in the above-described background item and the present invention will be described in detail. Patent Document 1 also describes a manual operation from the description of “holding the slack at the tip of the guide rope 23 by hand and throwing it over the winder 24” in the upper left column, lines 6 to 8 of the second page. It is clear that the present invention is intended for a dimension of a level that can be handled by the above, specifically, a small device. In addition, as described in the upper left column of the second page, lines 10 to 16 and the upper right column of the third page, lines 14 to 17 in the patent document 1, one side of the take-off rollers 15 to 20 is disclosed in the patent document 1. The film is passed through the grooved guide rollers 4 to 9 and 41 to 51 provided only on the film, and the phenomenon that the film is shifted to the end of the roll, which is an object of the present invention, is not considered at all. .

  On the other hand, in the present invention, in the manufacturing process of the microporous membrane, a process specific to the microporous membrane such as washing the microporous membrane (specifically, the film before “porosity” is generated) is provided. Since the transport path of the film is longer than that of a normal bulk film by the amount of the washing step, it is extremely difficult to pass through the string and through the film. Focusing on the fact that the properties are fundamentally different from those of bulk films, specifically, the phenomenon that the strength tends to be weak and the film tends to lean to the end of the roll when passing the film occurs, and the invention was developed to avoid such a phenomenon. It was done. Patent Literature 1 does not describe or suggest such a problem derived from the properties of the film or the length of the transport path.

  In addition, since the organic solvent is used in the cleaning step of the microporous membrane, a general water treatment step using pure water or the like cannot be referred to.In addition, the atmosphere in which the organic solvent is used is sealed. Therefore, reliable stringing and film threading are required without relying on the visual inspection of an operator. However, Patent Document 1 is directed to a small-sized device at a level such that a part of the operation such as "throwing" by an operator is sufficient. However, there is no description suggesting a large-sized microporous membrane manufacturing apparatus to which the present invention is directed.

  Further, the film before washing is composed of a polyolefin resin and a plasticizer. Therefore, the film surface is moistened by the plasticizer, and since this plasticizer is a lubricant having a small surface tension such as "oil", the film is extremely difficult to be held and slippery. Therefore, even if the stringing is performed at the end of the roll and then the film passing position is moved to the center by relying on the frictional force of the film against the roll, the film does not move to the center because the film is slippery. On the other hand, in the present invention, since the threading is performed at the center of the roll, the film can be easily and reliably threaded even if the film is wetted by the plasticizer.

  Here, the rolls are arranged so as to be horizontal and laid out so as to be parallel to each other between the rolls. However, since the rolls are arranged so that their parallelism is within a specific standard, when viewed microscopically, the orientation of each roll with respect to the installation surface and the parallelism between the rolls are very small. Is shifted. Therefore, the film moistened by the plasticizer tends to move toward the end of the roll due to the slight displacement when the film is passed, in addition to the fact that the film is resisted by the liquid flow. However, in the present invention, when performing the stringing, since the rubber sheet is interposed between the stringing rod 25 and the string 51, when the stringing is performed over the cleaning tanks 40a to 40c whose transport path is extremely long. Even if there is, it is reliably maintained against the tension applied to the stringing rod 25. That is, when the transport path is extremely long, it is necessary to perform the threading while applying a relatively large tension to some extent so that the string 51 does not become tension-free in the middle of the transport path. In addition, the string 51 can be reliably arranged at the center of each roll from the stringing start position to the stringing end position on the transport path where the stringing is performed, while keeping the string 51 from breaking. For this reason, even in an actual apparatus in which the positional deviation due to the installation of each roll as described above is very slight, it is possible to easily perform the film passing.

  Further, Patent Document 2 is common to the present invention in that it focuses on a phenomenon in a liquid, but as can be seen from FIG. 2, the upper surfaces of the dyeing tank 40 and the crosslinking tank 50 are open. I have. Patent Document 2 relates to a technique for joining films, and does not relate to stringing or film threading at the start of film production, which is the object of the present invention. It does not fill the difference. Note that the treatment performed in “in liquid” described in Patent Document 2 is “dyeing” or “crosslinking” of a film. Since Patent Document 2 is directed to a polarizing plate, the “dyeing” or “crosslinking” is performed. Is a process intended for the surface of the film. Therefore, in the microporous film manufacturing process, the film is formed in the film in the film thickness direction through “microporous” being formed in the film in order to remove the plasticizer contained from the surface to the inside of the film. It is clear that the immersion time in the liquid in Patent Document 2 is shorter than that in the cleaning step in which the cleaning liquid needs to be passed. Specifically, when a microporous film is formed by washing the film, the plasticizer is extracted and removed from the film by the treatment liquid, and pores corresponding to the positions of the plasticizer contained in the film before washing are formed. You. Therefore, the cleaning liquid needs to penetrate into the inside of the film in the thickness direction of the film. Takes a very long time. Also, since the microporous membrane is formed by gathering a large number of fibrils made of thin fibrous polyolefin resin, the number, position and shape of the holes are microscopically varied in the width and length directions of the microporous membrane. It can be said that it is. Therefore, in the film cleaning process when forming a microporous film in which the number, position and shape of such holes are not uniform in the plane, the degree of penetration of the cleaning liquid into the film also depends on the width direction of the film. And the degree of physical influence on the film by the cleaning liquid also varies microscopically in the width direction and the length direction. Specifically, for example, at a portion where the formation ratio of holes is relatively large (the number of holes is large or the size of holes is large), a large amount of the processing liquid enters the inside of the film. The film tends to fluctuate due to physical resistance. On the other hand, in a portion where the formation ratio of holes is relatively small (the number of holes is small or the size of holes is small), a large amount of the processing liquid does not enter the inside of the film. Conveyed. Then, when cleaning a film in which the degree of the large and small degree of the physical effect received by such a processing liquid is unevenly distributed in the width direction and the length direction, when the film is conveyed in the liquid, Since the film surface tends to move toward a part with low physical resistance, and the film surface is slippery by the plasticizer as described above, it is also a “cleaning” treatment, and the processing liquid is naturally stirred. Therefore, when a film having a small length in the width direction is passed through the film, the film is particularly likely to approach the roll end. Therefore, the fact that the film is transported in Patent Document 2 cannot be a technique for filling the difference between the present invention and Patent Document 1 described above.

  Further, it is conceivable to adopt a configuration in which the transport roll 11 and the sprocket 21 are driven coaxially. In such a case, it is necessary to remove the transport roll 11 even when the sprocket 21 and the chain 22 are maintained. The sprocket 21 is preferably driven by a drive shaft separate from the transport roll 11 so that the chain 22 travels outside the transport path 12 along the transport path 12 for the film. In addition, in consideration of maintenance, it is preferable that the string passing rod 25 be detachably provided to the chain 22.

  In the case of performing the above-described stringing and film threading, these stringing and film threading are performed at a speed lower than a normal film transport speed, and then the film reaches the downstream end from the upstream end of each process. At this time, the film transport speed is increased to an arbitrary manufacturing speed, and normal continuous processing is started.

  In the configuration in which the sprocket 21 and the chain 22 are disposed in the processing liquid 3 as in the above-described film manufacturing apparatus 2, parts such as bearings used for traveling of the chain 22 by the sprocket 21 may be rusted, Although it may be necessary to replace the sprocket, the sprocket 21 and the chain 22 are provided only at one end of the transport roll 11 in the film transport device 1 of the present embodiment. Maintenance becomes easy for the configuration in which the chain 21 and the chain 22 are provided. Further, in the configuration in which the sprocket 21 and the chain 22 are provided only on one end side of the transport roll 11 as in the present embodiment, the configuration is such that the sprocket 21 and the chain 22 are provided on both end sides of the transport roll 11 respectively. On the other hand, there is no need to match the drive and running timings of the sprocket 21 and the chain 22 at both ends of the transport roll 11, and it is possible to avoid applying a load to the chain 22 and the like.

  Note that, in the film transport device 1 of the present embodiment, the string passing rod 25 attached to the chain 22 has a length from the inside of the chain 22 to the center of the transport roll 11, and has a leading end for threading. Since the fixing portion 26 to which the string 51 is connected is provided, the string 51 for string passing and the film connected to the string 51 are conveyed around the center portion of the conveying roll 11. The length of the passing rod 25 may be longer than the interval between the chain 22 and the end on one end side of the transport roll 11.

  The chain 22, the sprocket 21, and the string passing rod 25 may be provided on only one side of the transport roll 11 as described above, or may be disposed on both sides, and only one of them may be used. In that case, with respect to the configuration including the chain 22, the sprocket 21, and the string passing rod 25 on both sides of the transport roll 11, if one of the configurations fails, the other configuration can be used.

REFERENCE SIGNS LIST 1 film transport device 2 film manufacturing device 4 film 11 transport roll 21 sprocket 22 chain 25 string passing rod 26 fixing portion A film transport direction B chain traveling direction C direction in which film (string) is pulled out

Claims (16)

Used in a film transport apparatus having a plurality of transport rolls for transporting a film, and when passing a film between the plurality of transport rolls along the transport path thereof, passing the film between the plurality of transport rolls. A paper passing device that performs stringing between a plurality of transport rolls prior to a paper forming operation,
A guide member that is provided in an area away from one end of the transport roll to an outer side with respect to a transport area where the film is transported by the plurality of transport rolls, and causes a linear guide member to travel along a transport path of the film,
A rod-shaped member provided on the line-shaped guide member and extending toward the transport region,
A paper passing device, wherein a fixing portion for connecting the string for string passing to the rod-shaped member is provided at an end of the rod-shaped member on the side of the transport region. The paper passing device according to claim 1,
The paper passing device, wherein a length of the bar-shaped member is longer than an interval between the line-shaped guide member and the end of the one end of the transport roll. The paper passing device according to claim 1 or 2,
The paper passing device, wherein the rod-shaped member is detachably provided to the line-shaped guide member. The paper passing device according to any one of claims 1 to 3,
The paper passing device, wherein the rod-shaped member is made of a material having elasticity. The paper passing device according to any one of claims 1 to 4,
The paper passing device, wherein the guide member is arranged such that the linear guide member travels outside the transport path while being along the transport path of the film. The paper passing device according to any one of claims 1 to 5,
The paper passing device, wherein the linear guide member is formed in an endless shape. The paper passing device according to claim 6,
The paper passing device, wherein the line-shaped guide member has an area that returns from a downstream side to an upstream side of a film conveyance path and is located downstairs with respect to an area where the conveyance rolls are arranged. The paper passing device according to any one of claims 1 to 7,
The paper passing device, wherein the linear guide member is disposed around a horizontal axis. A paper passing device according to any one of claims 1 to 8,
A processing tank in which a processing liquid is stored,
The film manufacturing apparatus, wherein the transport roll is disposed in the processing tank so that the film is transported in the processing liquid. The film manufacturing apparatus according to claim 9,
A film manufacturing apparatus, wherein the treatment liquid is an organic solvent. The film manufacturing apparatus according to claim 10,
The film manufacturing apparatus, wherein the rod-shaped member is made of a member having chemical resistance. The film manufacturing apparatus according to any one of claims 9 to 11,
A film manufacturing apparatus, wherein at least one of a side surface and a ceiling surface of the processing tank is provided with a confirmation window that allows the linear guide member to be visually recognized from the outside. In the film manufacturing apparatus according to any one of claims 9 to 12,
The film manufacturing apparatus, wherein the length of the film transport path is 20 to 100 times the width of the transport rolls constituting the transport path. A kneader for kneading the resin and the plasticizer to obtain a resin solution,
A die for discharging the resin solution into a gel sheet,
A cooling device for cooling the resin solution discharged into a gel sheet to obtain a film,
A stretching device for stretching the film,
A film manufacturing apparatus according to any one of claims 9 to 13, wherein a plasticizer is removed from the stretched film to obtain a microporous film,
An apparatus for manufacturing a microporous membrane, comprising: a winding section for winding the microporous membrane. Used in a film transport device having a plurality of transport rolls for transporting a film, when passing a film between the plurality of transport rolls along the transport path of the film, the film between the plurality of transport rolls A film passing method using a paper passing device that performs string passing between a plurality of transport rolls prior to a passing operation,
Extending toward a film transport area of a rod-shaped member provided in a linear guide member disposed in a region outwardly separated from one end of the transport roll with respect to a transport area in which a film is transported by the plurality of transport rolls. Connecting one end of the string to the tip
Run the linear guide member along the film transport path, pull out one end of the string toward the downstream side of the film transport path, and move the other end of the string to the upstream side of the film transport path. Waiting and waiting;
After one end of the string is pulled out to the downstream side of the film transport device, stopping the linear guide member, separating the one end of the string from the rod-shaped member, Fixing the leading end, further pulling out one end side of the string, and threading the film between the plurality of transport rolls. A step of kneading a polyolefin resin and a plasticizer to prepare a polyolefin solution,
Cooling the polyolefin solution to form a gel sheet as the film,
A step of passing the gel sheet through a film in a washing tank to remove a plasticizer, a step of using the film passing method according to claim 15,
Winding the microporous membrane from which the plasticizer has been removed by passing through the washing tank.

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