JP2012196750A - Device and method for cutting film, and method for manufacturing film - Google Patents

Abstract

An object of the present invention is to prevent a film from being contaminated with chips generated by cutting the film.
A cutting device 23 cuts a film 16 being conveyed in a conveying direction. The cutting device 23 includes a slitter 41 having an upper blade 42 and a lower blade 43, and a first removal unit 55 and a second removal unit 56 that remove chips. The first removal unit 55 blows air from the nozzles 61 of the first air blowing portion 58 to detach chips from the cutting edge portion 42 b of the upper blade 42. The detached chips are sucked by the nozzle 66 of the first suction unit 59 from the upper blade side cover 57 provided so as to cover the upper blade 42. The second removal unit 56 blows air from the nozzles 76 of the second air blowing unit 71 to detach chips from the lower blade 43. The detached chips are sucked by the nozzle 81 of the second suction part 72.
[Selection] Figure 3

Description

  The present invention relates to a film cutting device, a cutting method, and a film manufacturing method.

  Various polymer films such as a cellulose acylate film, a cyclic polyolefin film, and a polyester film are cut into a predetermined width when a deformed side end is cut or a product is formed in the manufacturing process. When such a cutting process is performed on a long film, the film is transported, continuously cut in the transport direction of the film being transported, and the film is cut in the width direction.

  There are various cutting devices, but from the viewpoint of continuous cutting in the film transport direction, there is a so-called slitter that guides and cuts the film between the upper blade and the lower blade that rotate while sliding on each other. Used a lot.

  When the film is cut, fine film scraps, that is, chips are often generated, and the generated chips become a source of contamination of the film. Chips may be generated and attached directly to the film, or after being once attached to the slitter, the chips are often transferred from the slitter to the film.

  Therefore, in order to prevent chips from adhering to the slitter, in the cover covering the upper blade, air is blown from the nozzle to the blade edge of the upper blade, and the air in the cover is sucked and the lower blade A method of sucking air in the vicinity has been proposed (see, for example, Patent Document 1). In the method of Patent Document 1, a cover that covers the upper blade is provided, and air is blown from the nozzle to the blade edge portion of the upper blade in this cover. Also, the air in the cover is sucked. Furthermore, in the method of this patent document 1, the box in which the open part is formed facing the lower blade is arranged in the vicinity of the lower blade, and the inside of the box is sucked.

Japanese Patent Laid-Open No. 06-935688

  However, the cutting method as in Patent Document 1 has a certain effect in terms of making chips difficult to adhere to the slitter, but the effect is not perfect. For example, chips may still remain in the slitter, and the remaining chips may move to the cut surface of the film, or the chips that flutter around may adhere directly to the cut surface of the film.

  Therefore, an object of the present invention is to provide a film cutting apparatus and method, and a film manufacturing method in which the cut surface of the film is free from contamination by chips generated by cutting.

  In order to solve the above-mentioned problems, a film cutting apparatus of the present invention has an upper blade and a lower blade that are rotated around rotation axes parallel to each other, and a part of the edge of the peripheral edge of the upper blade is the above-mentioned A slitter that is arranged so as to overlap with a lower blade and is cut into a narrow film by passing a wide film between the rotating upper blade and the lower blade, and on the narrow film feeding side of the slitter A first removal unit that is disposed and removes chips of the narrow film generated by cutting the slitter on the upper blade side of the narrow film, and a non-excluding region where the lower blade overlaps with the upper blade A second removal unit that is provided to face the overlap region and removes the chips of the narrow film, and the first removal unit has a cutting edge of the upper blade so as to cover a cutting edge portion of the upper blade. Partition the area around the outside A blade-side cover and a first air blowing portion that has an upper blade-side nozzle that is inserted through the upper blade-side cover and has an opening formed at a tip toward the blade tip portion of the upper blade, and that blows out air from the opening. And a first suction part for sucking air inside the upper blade side cover, and the second removal unit has a lower blade side nozzle in which an opening is formed at a tip toward the non-overlap region A second air blowing portion that blows out air from the opening, and a second suction portion that sucks air around the non-overlap portion region.

  It is preferable that the tip of the nozzle on the upper blade side is directed toward the blade edge portion of the upper blade so that the blown out air is directed toward the blade edge portion of the rotating upper blade.

  It is preferable that the upper blade side nozzle is arranged so that an angle formed with the upper blade is in a range of 10 ° to 70 °.

  The first removal unit has a pair of upper blade side nozzles, one upper blade side nozzle is disposed on a sliding surface side that is in sliding contact with the lower blade of the upper blade, and the other is the sliding surface of the upper blade. It is preferable to be disposed on the non-sliding contact surface side opposite to the contact surface.

  The second removal unit has a lower blade side cover that partitions the periphery of the lower blade from an external space so as to cover a non-overlap region of the lower blade, and the lower blade side nozzle is inserted into the lower blade side cover. The second suction part preferably sucks air inside the lower blade side cover.

  Further, the film cutting method of the present invention has a disk-shaped upper blade and a cylindrical lower blade that rotate around mutually parallel rotation axes, and a part of the edge of the peripheral edge of the upper blade is the lower A slitting film disposed in an overlapping manner with a blade is cut into a narrow film through a wide film between the upper blade and the lower blade, and is disposed on the narrow film feeding side of the slitter, and the cutting edge of the upper blade Inside the upper blade side cover that partitions the periphery of the part from the external space, by blowing air to the blade edge portion of the upper blade, the swarf of the narrow film generated by the cutting is detached from the upper blade, By sucking air from the upper blade side cover, the chips are discharged from the inside of the upper blade side cover, and air is blown toward a non-overlapping region excluding the overlapping region of the lower blade with the upper blade. Depending on whether the lower blade The cutting powder is desorbed, by sucking air around the non-overlapping region, it is configured as characterized by removing the detached chips.

  It is preferable that air is blown onto the cutting edge portion so that the wind is directed against the cutting edge portion of the upper blade during rotation.

  It is preferable that air is blown to the blade edge portion so that an angle formed by the upper blade and the air flow direction is in a range of 10 ° to 70 °.

  It is preferable that air is blown to the cutting edge on the sliding contact surface side that is in sliding contact with the lower cutting edge of the upper blade and the cutting edge on the non-sliding contact side opposite to the sliding contact surface.

  Air is blown toward the non-overlapping region of the lower blade inside the lower blade side cover provided to cover the non-overlapping region of the lower blade and partitioning the periphery of the lower blade from the external space, It is preferable to discharge the chips from the inside of the lower blade side cover by sucking air from the blade side cover.

  The film production method of the present invention comprises a film forming step of forming a wide film from a polymer solution in which a polymer is dissolved in a solvent or a molten polymer, a disk-shaped upper blade rotating around a rotation axis parallel to each other, and a columnar shape A narrow film that passes through the wide film between the upper blade and the lower blade of a slitter that has a lower blade and a part of the edge of the upper blade is overlapped with the lower blade. A cutting step of cutting into a narrow film of the slitter, arranged on the feeding side of the narrow film, and inside the upper blade side cover that divides the periphery of the blade edge portion of the upper blade from the external space, on the blade edge portion of the upper blade By blowing air, the chips of the narrow film generated by the cutting are detached from the upper blade, and air is sucked from the upper blade side cover, whereby the chips from the inside of the upper blade side cover. The The air is blown toward the non-overlapping region excluding the overlapping region of the lower blade with the upper blade, so that the chips are detached from the lower blade, and the periphery of the non-overlapping region is It is characterized by removing detached chips by sucking air.

  According to the film cutting apparatus and method and the film manufacturing method of the present invention, the film can be cut without being contaminated by cutting powder.

It is the schematic of solution casting apparatus. It is a top view which shows the outline | summary of a cutting device. It is a side view containing the partial cross section of a cutting device. It is sectional drawing which follows the IV-IV line of FIG. It is a top view of the cutting device seen from the normal line direction of the film surface of the upper blade side.

  FIG. 1 is a schematic view of a solution casting apparatus embodying the present invention. The solution casting apparatus 10 includes a film forming device 17 that forms a film 16 from a polymer solution (hereinafter referred to as a dope) 13 in which a polymer 11 is dissolved in a solvent 12, and a tension in the width direction applied to the formed film 16. A tenter device 21 that advances drying, a roller drying device 22 that further advances drying while conveying the film 16 that has passed through the tenter device 21 with a roller, a cutting device 23 that cuts off each side edge of the film 16, and a dried film 16 And a take-up device 26 that winds the roll into a roll shape.

  The film forming apparatus 17 includes a band 28 as a casting support that is conveyed while being supported by a backup roller 27, and a casting die 31 that flows the dope 13 on the band 28. By flowing the dope 13 from the casting die 31 to the band 28 being conveyed, the dope 13 is cast on the band 28 to form a casting film 32. The cast film 32 is hardened to such an extent that it can be conveyed to the tenter device 21, and then peeled off from the band 28 as the film 16. In this stripping, the film 16 is supported by the stripping roller 33, and the stripping position where the casting film 32 is stripped from the band 28 is kept constant.

  As a method for solidifying the casting film 32, there are a so-called dry casting for drying the casting film 32 and a so-called cooling casting for cooling the casting film to gel. In the case of cooling casting, instead of the band 28 conveyed by the backup roller 27, it is preferable to use a drum having a circular cross section and having a casting film 32 formed on the peripheral surface.

  The film 16 is transported by a roller 34 disposed in a transition part 36 extending from the film forming device 17 to the tenter device 21 and guided to the tenter device 21. In the tenter device 21, the side edge of the film 16 is held by holding means (not shown), and the film 16 is dried while being transported by the holding means. The holding means conveys the film 16 while being displaced in the width direction of the film 16 so as to apply a predetermined tension in the width direction at a predetermined timing.

  When the film 16 is sent from the tenter device 21 to the roller drying device 22, the film 16 is supported by the peripheral surfaces of a plurality of rollers 22 a arranged side by side in the transport direction. Among these rollers 22a, there is a driving roller that rotates in the circumferential direction, and it is conveyed by the rotation of this driving roller.

  Then, the film 16 dried by the roller drying device 22 is sent to the cutting device 23, and both sides of the film 16 being conveyed are continuously cut by a slitter to remove each side edge. By this cutting, the wide film 16 becomes a narrow film 16 having a narrower width. A central portion between one side end and the other side end is sent to the winding device 26 as a product film, for example, and wound into a roll.

  As shown in FIG. 2, the cutting device 23 includes a slitter 41 that continuously cuts the film 16 with a line SL (hereinafter referred to as a slit line) SL to be cut. In this embodiment, a pair of cutting devices 23 are provided on both sides of the conveyance path of the film 16 so as to remove both side ends of the film 16. When a plurality of narrow films 16 are obtained from the wide film 16, a plurality of cutting devices 23 are arranged in the width direction Y of the film 16 at intervals corresponding to the width of the target narrow film 16. Good. The width direction of the film 16 is a direction orthogonal to the transport direction X of the long film 16.

  2 and 3, the slitter 41 includes an upper blade 42 and a lower blade 43, and further includes a drive mechanism (not shown) that rotates the upper blade 42 and the lower blade 43.

  The upper blade shaft 42a is rotatably held by a holding means (not shown). The upper blade shaft 42a is rotated by a drive mechanism (not shown). The upper blade 42 is fixed to the upper blade shaft 42a and rotates integrally with the upper blade shaft 42a in the direction indicated by the arrow A in FIG. 3 (hereinafter referred to as the A direction). The lower blade shaft 43a is rotatably held by a holding means (not shown). The lower blade shaft 43a is rotated by a drive mechanism (not shown). The lower blade 22 as a receiving blade is fixed to the lower blade shaft 43a and rotates integrally with the lower blade shaft 43a in the direction indicated by the arrow B in FIG. 3 (hereinafter referred to as the B direction). The upper blade shaft 42a and the lower blade shaft 43a are parallel to each other and are disposed so as to be orthogonal to the transport direction X of the film 16, respectively.

  The blade edge portion 42 b formed as the peripheral edge portion of the upper blade 42 is disposed so as to overlap with the lower blade 43. A region where the upper blade 42 and the lower blade 43 overlap each other is referred to as an overlap region in the following description, and is denoted by a symbol E in FIG.

  The holding means for holding the upper blade shaft 42a and the holding means for holding the lower blade shaft 43a are displaceable independently in the normal direction of the film surface of the film 16 and in the width direction Y of the film 16, The shift unit 46 is displaced in a predetermined direction by a predetermined displacement amount. Due to the displacement of each holding means, the upper blade 42 is displaced integrally with the upper blade shaft 42a, and the lower blade 43 is displaced integrally with the lower blade shaft 43a. The size of the overlap region E is adjusted by displacing at least one of the upper blade 42 and the lower blade 43 in the normal direction of the film surface. The upper blade 42 and the lower blade 43 are integrally displaced in the width direction Y of the film 16 to adjust the cutting position.

  The shift portion 46 is controlled by the controller 47 in the direction and amount of displacement of the holding means for the upper blade 42 and the lower blade 43.

  The cutting device 23 will be further described with reference to FIGS. 4 and 5, in order to avoid complication of the drawing, some of the members and the like shown in FIG. 3 are not shown. The lower blade 43 has a wide width, that is, a cylindrical shape, in order to support the film 16 at the cutting position. A cylindrical roller member 51 is coaxially and integrally formed on the lower blade 43. A groove 52 is formed between the lower blade 43 and the roller member 51.

  The disc-shaped upper blade 42 is adjusted so that the blade edge portion 42b enters the groove 52 and overlaps with the lower blade 43 in the overlap region E having a predetermined size. Further, the blade edge portion 42b has a lower blade side surface facing the lower blade 43 in sliding contact with the lower blade. The upper blade 42 and the lower blade 43 are cut by sandwiching the film 16 therebetween while supporting the film 16 from one surface by the lower blade 43. The sliding contact does not mean only the state where the blade part 42b and the blade part 43b are in contact with each other, but also includes the state where there is a slight gap between them in order to perform shearing.

  In addition, in this embodiment, although the opposite side to the groove | channel of the lower blade 43 is made into the truncated cone shape (refer FIG. 4), this shape is not specifically limited.

  In addition to the slitter 21, the cutting device 23 includes a first removal unit 55 and a second removal unit 56 that remove chips (film waste) generated by cutting the film 16. The first removal unit 55 is disposed on the sending side of the film 16 of the slitter 21, and is provided in an area on the upper blade 42 side with respect to the film 16. The 2nd removal unit 56 is provided facing the non-overlap area | region except the overlap area | region E with the upper blade of the lower blade 43. As shown in FIG. The second removal unit 56 may be provided at a position facing the first removal unit 55 through the film 16.

  The first removal unit 55 includes an upper blade side cover 57 that covers the cutting edge portion 42 b of the upper blade 42, a first air blowing portion 58, and a first suction portion 59. The upper blade side cover 57 partitions the periphery of the blade edge portion 42b from the external space so as to cover the blade edge portion 42b downstream of the cutting position in the A direction. The upper blade side cover 57 is formed with an opening 60 so as to face the upper blade 42 so as not to hit the rotating upper blade 42. The upper blade side cover 57 is disposed so that the upper blade 42 is fitted into the opening 60.

  The first air blowing unit 58 includes a pair of nozzles 61, a blower 62, and a controller 63. The pair of nozzles 61 is inserted through the upper blade side cover 57, respectively, and each tip is directed to the blade edge portion 42 b of the upper blade 42. An opening 61a as an air outlet is formed at the tip facing the blade edge portion 42b. The blower 62 supplies a predetermined flow rate of air to the nozzle 61. In the blower 62, the flow rate of air supplied to the nozzle 61 is controlled by the controller 63. The controller 63 controls the flow rate of air from the blower 62 so as to adjust the flow rate of air that exits from the opening 61 a at the tip of the nozzle 61. As a result, the nozzle 61 ejects the supplied air from the opening 61a at a predetermined flow velocity, and blows the air toward the cutting edge portion 42b.

  By blowing air from the nozzle 61, the chips adhering to the cutting edge part 42b immediately after cutting are detached from the cutting edge part 42b. Since the cutting edge portion 42 b immediately after cutting and the tip of the nozzle 61 are surrounded by the upper blade side cover 57, chips do not fly around the slitter 23 and the film 16. Further, since the chips are detached from the blade edge portion 42b, the movement of the chips from the upper blade 42 to the cut surface of the film 16 is extremely reduced.

  More preferably, the tip of the nozzle 61 in which the opening 61a is formed is directed in the opposite direction in the plane including the A direction with respect to the rotation direction (A direction) of the blade edge portion 42b. Thereby, air is blown against the cutting edge portion 42b of the rotating upper blade 42 as a head wind. By blowing air as a head wind, the detachment of chips becomes more reliable.

  The nozzle 61 is preferably arranged so that the angle θ1 formed with the upper blade 42 is in the range of 10 ° to 70 °. The angle θ1 formed is more preferably in the range of 15 ° to 60 °, and further preferably in the range of 15 ° to 45 °. The angle θ <b> 1 formed by the nozzle 61 and the upper blade 42 is an angle between the direction of the tip where the opening of the nozzle 61 is formed and the upper blade 42. In addition, you may consider that the direction of the front-end | tip in which the opening of the nozzle 61 is formed, and the flow direction of the air from opening of a front-end | tip match.

  In this embodiment, one of the pair of nozzles 61 is arranged on the sliding contact surface side with the lower blade 43 of the upper blade 42 as described later, and the other nozzle 61 is not slid on the upper blade 42. It is arranged on the contact side. In such a case, the angle θ1 formed between the nozzle 61 on the sliding surface side and the upper blade 42 is the angle formed between the nozzle 61 and the sliding surface of the upper blade 42, and the nozzle 61 on the non-sliding surface side. The angle θ1 formed by the upper blade 42 and the upper blade 42 is an angle formed by the nozzle 61 and the non-sliding contact surface of the upper blade 42.

  When the angle θ1 formed by the nozzle 61 and the upper blade 42 is not less than 10 ° and not more than 70 °, the chip detachment effect is very large as compared with the case of less than 10 ° and more than 70 °.

  The first suction unit 59 includes a nozzle 66, a suction machine 67, and a controller 68. The nozzle 66 is inserted into the upper blade side cover 57, and the tip is directed to the cutting edge portion 42 b of the upper blade 42. An opening 66a as an air suction port is formed at the tip facing the blade edge portion 42b. The suction machine 67 is connected to the other end of the nozzle 66 and sucks air at a predetermined flow rate. Thus, suction is performed from the upper blade side cover 57 through the nozzle 66 at a predetermined flow rate. In the suction machine 67, the flow rate of air to be sucked is controlled by the controller 68. The controller 68 controls the flow rate of air sucked by the suction machine 67 so as to adjust the flow rate of air sucked from the opening at the tip of the nozzle 66. As a result, the nozzle 61 sucks air from the tip at a predetermined flow rate, and discharges the chips separated from the cutting edge portion 42 b of the upper blade 42 from the inside of the upper blade side cover 57.

  In the present embodiment, the nozzle 66 is inserted through the upper blade side cover 57, and the tip of the nozzle 66 is directed toward the blade edge portion 42b. Instead of this mode, an opening may be formed in the upper blade side cover 57 without using the nozzle 66, and air may be sucked from the opening by the suction device 67. However, when the nozzle 66 is used, the detachment of the chips from the cutting edge portion 42a of the upper blade 42 becomes more reliable than when the nozzle 66 is not used. Even if it adheres, the chips are more reliably detached from the cut surface, and the discharge of the chips from the upper blade side cover 57 becomes more reliable.

  In the present embodiment, the nozzle 61 and the nozzle 66 are arranged so that the tip of the nozzle 66 that sucks air is upstream of the tip of the nozzle 61 that blows air in the A direction. That is, the cutting position, the tip of the nozzle 66, and the tip of the nozzle 61 are arranged in this order from the upstream side in the A direction. Further, the nozzle 66 is disposed so that the tip thereof is opposed to the blowing position of the cutting edge 42 b where air is blown by the nozzle 61. By arranging the nozzle 61 and the nozzle 66 in this manner, the chips detached from the blade edge 42 b are more effectively discharged from the upper blade side cover 57.

  One of the pair of nozzles 61 is disposed on the sliding contact surface side with the lower blade 43 of the upper blade 42, and the tip is opposed to the sliding contact surface of the blade edge portion 42b. The other nozzle 61 is disposed on the non-sliding contact side of the upper blade 42, and has a tip opposed to the non-sliding contact surface of the blade edge portion 42b. The non-sliding contact surface of the upper blade 42 is a surface opposite to the sliding contact surface. In this way, by arranging the pair of nozzles 61 on the sliding contact surface side and the non-sliding contact surface side of the upper blade 42, air is supplied to both the sliding contact surface and the non-sliding contact surface of the blade edge portion 42. Spray. Thereby, the chips adhering to the blade edge portion 42 are more reliably detached from the blade edge portion 42.

  When the flow rate of air blown from the nozzle 61 is V1, and the flow rate of air by suction of the nozzle 66 is V2, the flow rate of air from the nozzle 61 and the flow rate of air by suction of the nozzle 66 are set so that V2 is larger than V1. It is preferable to adjust at least one of the flow rate. Thereby, prevention of the adhesion | attachment of the chip in the cut surface of a film becomes more reliable.

  The second removal unit 56 includes a lower blade side cover 70 that covers a non-overlapping region of the lower blade 43, a second air blowing portion 71, and a second suction portion 72. The lower blade side cover 70 partitions the periphery of the non-overlapping region from the external space so as to cover a portion of the lower blade 43 downstream of the cutting position in the B direction. The non-overlap region is a region of the lower blade 43 excluding the overlap region E with the upper blade 42. The lower blade side cover 70 is formed with an open portion 73 so as to face the lower blade 43 so as not to hit the rotating lower blade 43. The lower blade side cover 70 is arranged so that the lower blade 43 is fitted into the open portion 73.

  The second air blowing unit 71 includes a nozzle 76, a blower 77, and a controller 78. The nozzle 76 is inserted into the lower blade side cover 70, and the tip is directed to the non-overlapping region of the lower blade 43. An opening 76 a serving as an air blowing port is formed at the tip facing the lower blade 43. The blower 77 supplies a predetermined flow rate of air to the nozzle 76. In the blower 77, the flow rate of air supplied to the nozzle 76 is controlled by the controller 78. The controller 78 controls the flow rate of air from the blower 77 so as to adjust the flow rate of air that exits from the opening 76 a at the tip of the nozzle 76. As a result, the nozzle 76 ejects the supplied air from the opening 76 a at a predetermined flow rate and blows air toward the non-overlapping region of the lower blade 43.

  By blowing air from the nozzle 76, the chips adhering to the lower blade 43 immediately after cutting are detached from the lower blade 43, and even if the chips adhere to the cut surface of the film 16, Chips are detached. Since the lower blade 43 immediately after cutting and the tip of the nozzle 76 are surrounded by the lower blade side cover 70, chips do not fly around the slitter 23 and the film 16.

  The tip of the nozzle 76 where the opening 76a is formed is preferably directed to the sliding surface of the lower blade that is in sliding contact with the upper blade 42. Thereby, in addition to the detachment of the chips from the lower blade 43, the detachment of the chips from the cut surface of the film 16 is further ensured. If it is difficult to arrange the nozzle 76 so that the tip of the nozzle 76 faces the sliding contact surface with the upper blade 42 due to space, the tip may be directed to the groove 52.

  It is preferable to arrange the nozzle 76 such that the sliding contact surface with the upper blade 42 of the lower blade 43 and the nozzle 76 have an angle θ2 in the range of 0.5 ° to 45 °. The angle θ2 formed is more preferably in the range of 0.5 ° to 40 °, and further preferably in the range of 0.5 ° to 30 °. The slidable contact surface with the upper blade 42 of the lower blade 43 is a surface on the roller member 51 side that is formed as a groove 52. This angle θ2 is an angle between the direction of the tip where the opening 76a of the nozzle 76 is formed and the sliding surface of the lower blade 43. It should be noted that the direction of the tip where the opening 76a of the nozzle 76 is formed and the direction of air flow from the tip opening may be considered to coincide with each other.

  When the angle θ2 formed by the nozzle 76 and the slidable contact surface of the lower blade 43 is 10 ° or more and 40 ° or less, the chip detachment effect is much higher than when the angle θ2 is less than 10 ° and more than 40 °. large.

  The second suction unit 72 includes a nozzle 81, a suction machine 82, and a controller 83. The nozzle 81 is inserted through the lower blade side cover 70, and the tip is directed to the non-overlap region of the lower blade 43. An opening 81a as an air suction port is formed at the tip. The suction device 82 is connected to the other end of the nozzle 81 and sucks air at a predetermined flow rate. Thus, suction is performed from the lower blade side cover 70 through the nozzle 81 at a predetermined flow rate. In the suction machine 82, the flow rate of air to be sucked is controlled by the controller 83. The controller 83 controls the flow rate of air sucked by the suction machine 82 so as to adjust the flow rate of air sucked from the opening 81 a at the tip of the nozzle 81. As a result, the nozzle 81 sucks air from the tip at a predetermined flow rate, and discharges the chips detached from the lower blade 43 from the lower blade side 70.

  In this embodiment, the nozzle 81 is inserted into the lower blade side cover 70, and the tip of the nozzle 81 is directed to the blade edge portion 42b. Instead of this aspect, an opening may be formed in the lower blade side cover 70 without using the nozzle 66, and air may be sucked from the opening by the suction device 82. However, the discharge of chips from the lower blade side cover 70 is more reliable when the nozzle 81 is used than when the nozzle 81 is not used.

  In this embodiment, the lower blade side cover 70 is provided, but the lower blade side cover 70 is not necessarily provided. However, when the lower blade side cover 70 is used, the swarf detached from the lower blade 43 does not move around, and the detached swarf is reliably captured compared to when the lower blade side cover 70 is not used. The captured chips can be recovered and reused as a dope raw material.

  In the present embodiment, the nozzle 76 and the nozzle 81 are arranged so that the tip of the nozzle 81 that sucks air is upstream of the tip of the nozzle 76 that blows air in the B direction. That is, the cutting position, the tip of the nozzle 81, and the tip of the nozzle 76 are arranged in this order from the upstream side in the B direction. Further, the nozzle 81 is disposed so that the tip thereof is opposed to the blowing position of the lower blade 43 to which air is blown by the nozzle 76. By arranging the nozzle 76 and the nozzle 81 in this way, the chips separated from the lower blade 43 are more effectively sucked.

  The side end portion 16 a separated from the film 16 is collected by a collection unit (not shown) and reused for the dope 11.

  In FIG. 1 and FIG. 3, the conveyance path of the film 16 at the time of cutting is shown horizontally, but the present invention is not limited to this aspect. That is, the film 16 may be transported in a direction crossing the horizontal direction, and the film 16 may be cut in this transported state. For example, the conveyance direction X of the film 16 may be a direction from the top to the bottom, and the film 16 may be passed between the upper blade 42 and the lower blade 43 arranged in the horizontal direction.

  Further, when the side end portion 16a is cut from the film 16 as in the present embodiment, the cut side end portion 16a and the film 16 from which the side end portion 16a is cut are transported at an angle θ3. Is preferred. Here, the angle θ3 (see FIG. 3) formed by the transport path of the side end portion 16a and the transport path of the film 16 from which the side end portion 16a is cut is an angle when the film 16 is viewed from the side. The formed angle θ3 is more preferably in the range of 1 ° to 10 °.

  The conveyance path of the film 16 from which the side end portion 16 is cut is set by a slitter 41 and a roller 34 downstream of the slitter 41. Further, the conveyance path of the side end portion 16 a separated from the film 16 is set by the slitter 41 and a roller 86 downstream of the slitter 41. The roller 86 is provided with a shift mechanism 87, and the roller 86 is displaced by the shift mechanism 87 so that the distance from the conveyance path of the film 16 from which the side end portion 16 is cut is changed. The roller 86 controls the angle θ3 formed by the conveyance path between the side end portion 16a and the film 16 from which the side end portion 16a is cut off. However, instead of or in addition to this aspect, the roller 34 may be provided with a shift mechanism (not shown) to displace the roller 34.

  The above embodiment is a case where the cutting device 23 is provided in the conveyance path between the roller drying device 22 and the winding device 26 of the solution casting apparatus 10 and cutting is performed immediately before winding. This is based on the fact that the present invention is highly effective when cutting a hard film that is most likely to generate chips. In the solution casting equipment, the side end portion may be continuously cut in addition to the gap between the roller drying device 22 and the winding device 26 as described above, and the present invention is effective in any cutting process. is there. For example, a cutting device 23 is provided in each conveyance path between the film forming device 17 and the tenter device 21 or between the tenter device 21 and the roller drying device 22, and the film 16 peeled off from the band 28 is removed from the tenter device 21. Or cutting the holding portion held by the holding means of the tenter device 21 before guiding it to the roller drying device 22.

  Although this embodiment is a case where a film is formed by solution casting which manufactures a film from dope, the formation method of a film is not restricted to solution casting. For example, it may be replaced with melt film formation in which a polymer is melted and extruded into a thin film to form a film.

  A film 16 was produced from the dope 13 with the solution casting apparatus 10. Each side edge of the film 16 was cut out by the cutting device 23 before winding. In the cutting device 23, the angle θ1 formed by the nozzle 61 and the upper blade 42, the angle θ2 formed by the sliding surface of the nozzle 76 and the lower blade 43, the film 16 in which the conveyance path of the side end portion 16a and the side end portion 16a are cut off. Examples 1 to 13 were carried out in which the angle θ3 formed with each of the conveyance paths was changed. Table 1 shows θ1, θ2, and θ3 of Examples 1 to 13.

About each obtained film 16, the number of volatile points was investigated and evaluated. The number of volatiles was examined by the following method. First, the obtained film 16 was equally divided into 10 in the width direction, and 10 film samples were collected. Two polarizing plates were placed in an orthogonal state (crossed Nicols) to block transmitted light, and a film sample was placed between the two polarizing plates. One of the two polarizing plates was irradiated with light, and the other polarizing plate was observed with an optical microscope (50 times), and the number of bright spots with a diameter of 10 μm or more per 1 cm ² area was counted. . The number of volatile points was counted for each of ten film samples by this method. The average value of these 10 points regarding the number of volatile points was determined, and this was taken as the number of volatile points of the film 16. The number of volatile points thus obtained is shown in Table 1. Further, the number of volatile points was evaluated in the following five stages. A to C are practically acceptable levels, and D and E are unacceptable levels.
A: Less than 5 B: 5 or more and less than 10 B: 10 or more and less than 15 D: 20 or more and less than 50 E: 50 or more

[Comparative example]
The film was manufactured by removing the second removal unit 56 from the cutting device 23. This is referred to as Comparative Example 1. The film was manufactured by removing the first removal unit 55 from the cutting device 23. This is referred to as Comparative Example 2. The film was manufactured by removing the first and second removal units 55 and 56 from the cutting device 23. This is Comparative Example 3, and other conditions are the same as in the example.

  About the film obtained by each comparative example, the number of volatile points was investigated by the same method as an Example. The results are shown in Table 1.

16 Film 23 Cutting device 41 Slitter 42 Upper blade 42b Blade portion 43 Lower blade 55, 56 First and second removal units 58 and 71 First and second air blowing portions 59 and 72 First and second suction portions 61 and 66 .76, 81 Nozzle 57 Upper blade side cover 70 Lower blade side cover 48 Liquid supply part

Claims (11)

The upper blade has an upper blade and a lower blade that are rotated around rotation axes parallel to each other, and a part of the edge of the peripheral edge of the upper blade overlaps with the lower blade and rotates. A slitter that cuts into a narrow film by passing a wide film between the blade and the lower blade;
A first removal unit that is arranged on the narrow film feed side of the slitter and removes the chips of the narrow film produced by cutting the slitter on the upper blade side of the narrow film;
A second removal unit that is provided facing a non-overlapping region excluding an overlapping region of the lower blade with the upper blade, and that removes chips of the narrow film,
The first removal unit is inserted into the upper blade side cover that partitions the periphery of the blade edge portion of the upper blade from the external space so as to cover the blade edge portion of the upper blade, and the blade edge portion of the upper blade. A first air blowing portion that has an upper blade side nozzle having an opening formed at a tip thereof facing the nozzle, blows air out of the opening, and a first suction portion that sucks air inside the upper blade side cover; Have
The second removal unit includes a second air blowing portion that blows air from the opening of the lower blade side nozzle having an opening formed at a tip toward the non-overlapping region, and a periphery of the non-overlapping region. A film cutting apparatus comprising: a second suction unit that sucks air.   The tip of the upper blade side nozzle is directed to the blade edge portion of the upper blade so that the blown out air is directed toward the blade edge portion of the rotating upper blade. Film cutting device.   The film cutting apparatus according to claim 1, wherein the upper blade side nozzle is arranged so that an angle formed with the upper blade is in a range of 10 ° to 70 °.   The first removal unit has a pair of upper blade side nozzles, one upper blade side nozzle is arranged on a sliding surface side in sliding contact with the lower blade of the upper blade, and the other is the upper blade side of the upper blade. The film cutting device according to any one of claims 1 to 3, wherein the film cutting device is disposed on a non-sliding surface side opposite to the sliding surface. The second removal unit has a lower blade side cover that partitions the periphery of the lower blade from an external space so as to cover a non-overlapping region of the lower blade,
The lower blade side nozzle is inserted through the lower blade side cover,
5. The film cutting apparatus according to claim 1, wherein the second suction part sucks air inside the lower blade side cover. 6. A slitter having a disk-shaped upper blade and a cylindrical lower blade rotating about rotation axes parallel to each other, and a part of the edge of the peripheral edge of the upper blade overlapping with the lower blade Cutting a narrow film through a wide film between the upper blade and the lower blade,
Generated by the cutting by blowing air to the blade edge of the upper blade inside the upper blade side cover that is arranged on the narrow film feed side of the slitter and partitions the periphery of the blade edge of the upper blade from the external space. Further, the chips of the narrow film are detached from the upper blade,
By sucking air from the upper blade side cover, the chips are discharged from the inside of the upper blade side cover,
By blowing air toward the non-overlapping region excluding the overlapping region of the lower blade with the upper blade, the chips are detached from the lower blade,
The film cutting method, wherein the detached chips are removed by sucking air around the non-overlap region.   The film cutting method according to claim 6, wherein air is blown to the blade edge portion so that the wind is directed against the blade edge portion of the rotating upper blade.   8. The film cutting method according to claim 6, wherein air is blown onto the blade edge portion so that an angle formed by the upper blade and the air flow direction is in a range of 10 ° to 70 °.   The air is blown to the blade edge on the sliding contact surface side that is in sliding contact with the lower blade of the upper blade and the cutting edge on the non-sliding contact surface side opposite to the sliding contact surface, respectively. The film cutting method according to any one of the preceding claims. Air is blown toward the non-overlapping region of the lower blade inside the lower blade side cover provided to cover the non-overlapping region of the lower blade and partitioning the periphery of the lower blade from the external space,
The film cutting method according to claim 6, wherein the chips are discharged from the inside of the lower blade side cover by sucking air from the lower blade side cover. A film forming step of forming a wide film from a polymer solution in which the polymer is dissolved in a solvent or a molten polymer;
A slitter having a disk-shaped upper blade and a cylindrical lower blade rotating about rotation axes parallel to each other, and a part of the edge of the peripheral edge of the upper blade overlapping with the lower blade A cutting step of cutting into a narrow film through the wide film between the upper blade and the lower blade,
Generated by the cutting by blowing air to the blade edge of the upper blade inside the upper blade side cover that is arranged on the narrow film feed side of the slitter and partitions the periphery of the blade edge of the upper blade from the external space. Further, the chips of the narrow film are detached from the upper blade,
By sucking air from the upper blade side cover, the chips are discharged from the inside of the upper blade side cover,
By blowing air toward the non-overlapping region excluding the overlapping region of the lower blade with the upper blade, the chips are detached from the lower blade,
The film manufacturing method characterized by removing the separated chips by sucking air around the non-overlap region.

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