TWI499550B - Polymer film winding method and unit - Google Patents

Description

Polymer film winding method and unit

The present invention relates to a method and unit for winding a polymer film.

A polymer film which is a protective film for a polarizer such as a liquid crystal display (LCD) is generally produced by a solution casting method. In a film production line for producing a polymer film by a solution casting method, for example, a polymer such as cellulose acetate is dissolved in a solvent together with an additive such as a plasticizer, a UV absorber, and a lubricant to form a coating liquid. The coating liquid is cast onto a cylinder or belt as a circulating support. When hardened enough to have self-supporting properties, the coating liquid is stripped from the cylinder or tape into a soft film. Then, the peeled soft film is dried by hot air to form a polymer film (hereinafter referred to as a film) while being conveyed by a conveying roller.

The film is continuously transferred from the film production line to the film winding unit disposed on the downstream side. In the film winding unit, the film is wound around a cylindrical core made of resin, metal, wood, cardboard, or the like. The winding length of the film is from several hundred meters to several kilometers depending on the purpose, the mounting capacity, and the like. The film is wound into a bundle of film in a bundle. The film bundle is suitably packaged into the final product. When the winding speed of the film becomes faster as the productivity of the film production line increases in the film winding unit, in some cases, air may be entrained into the film bundle with the film. When air is entrained into the film bundle, it produces a film bundle in which the space between the films is not fixed due to entrained air. Therefore, local deformation with black lines (hereinafter referred to as black line defects) occurs in the film bundle.

In order to prevent this black line defect, the following method is known (for example, see Japanese Patent Laid-Open Publication No. 2002-220143). According to this method, it is thin The winding speed of the film, the thickness of the film, the winding radius of the film bundle, and the like are applied to the film of the wound film bundle. Further, a press roller (e.g., a mounting roller) presses the peripheral surface of the film bundle at a predetermined pressure. Therefore, it is possible to forcibly remove the air entrained when the film is wound, and further, it is possible to prevent a decrease in production quality due to air entrainment. Further, a method in which a film side edge is provided with a knurl and a film is wound around a core in order to prevent a winding deviation of the film bundle in the width direction thereof is known (for example, see Japanese Patent Laid-Open Publication No. 2002-255409). .

According to Japanese Patent Laid-Open Publication No. 2002-255409, a film having a side edge providing a embossing is continuously wound around a core when a core is pressed. As the film is wound around the core and stacked on each other, the small difference in thickness between the side edges of the embossed film and the product portion of the embossed film causes a step difference in the circumferential direction of the film bundle. This step occurs near the side edges of the film width direction on the peripheral surface of the film bundle. As the film is pressed and the film bundle around which this step occurs is wound, it causes local stress due to the step difference on the film wound around the film bundle. This stress causes the inner region of the side edge of the film to be elongated toward the product portion thereof in the film width direction (hereinafter referred to as side edge elongation). Further, in order to prevent the side edge from being elongated, it is also possible to reduce the winding tension or the pressure applied by the pressure roller, but in this case, the winding deviation due to air entrainment and the deterioration of the product quality occur.

In view of the above, it is an object of the present invention to provide a method and unit for winding a polymer film which not only prevents winding deviation and black line defects on the polymer film, but also prevents side edges of the polymer film. Elongation occurs.

In order to achieve the above and other objects, according to the present invention, there is provided a polymer film winding unit for winding a long polymer film around a core when a polymer film is pressed against a core, wherein a side edge of the polymer film in the width direction is subjected to rolling program. The polymer film winding unit comprises: an air blowing device for blowing air toward a polymer film wound around a core, the polymer film is pressed against the core by air blowing; and a polymer film region for adjusting the blowing air The adjustment device of the width Lp, the polymer film has a width La; and a control device for controlling the adjustment device to reduce the Lp/La value as the winding amount of the polymer film wound around the core increases.

Preferably, the control means controls the adjustment means such that when the polymer film is wound around the core, the Lp/La value is about 1, and when the polymer film is wound around the core, the Lp/La value is 0.9. To the range of 0.99.

Preferably, the adjusting device comprises a pair of air shielding members provided between the air blowing device and the polymer film, and a movement for moving the air shielding member in the width direction of the polymer film between the air shielding position and the allowable position. mechanism. The air shielding position is used to shield the air from flowing to the side ends of the width direction of the polymer film. The allowable position is used to allow passage of air to the polymer film. The moving mechanism for moving the air shielding member is controlled by the control device such that the distance between the pair of air shielding members decreases as the amount of winding increases. Further, the adjusting device preferably includes: a pair of guiding members each having a rotating shaft and a guiding surface for guiding the air toward the predetermined direction, the guiding member being rotatable about the rotating shaft between the guiding position and the retracting position, so that at the guiding position The guiding member is directed to the side end of the width direction of the polymer film in the width direction of the polymer film to be closer to the central portion of the polymer film at the side end of the opposite width direction. a region, and the guiding member at the retracted position retracts from the self-guided position; and an angle adjusting mechanism for adjusting an angle θ formed by the guiding surface of the guiding member at the guiding position and the guiding surface of the guiding member at the retracted position . The angle adjustment mechanism is controlled by the control device such that the angle θ increases as the amount of winding increases. Further, the air blowing device preferably includes an air passage having a vent such as a slit extending in the width direction, and an inner wall surface member for constituting one of the air passages to the inner wall surface, the inner wall surface being aligned in the vertical width direction The direction extends. The adjustment device preferably includes a moving mechanism for moving the inner wall surface member in the width direction. The moving mechanism for moving the inner wall surface member is preferably controlled by the control means such that the distance between the inner wall surface pairs decreases as the winding amount increases.

Preferably, the polymer film winding unit further comprises a method for moving at least one of the air blowing device and the core such that the distance between the surface of the polymer film when wound around the core and the pores disposed at the air blowing device A moving mechanism that is fixed in the range of approximately 5 to 15 mm.

Further, in accordance with the present invention, there is provided a method of winding a polymer film for winding a long polymer film around a core when the polymer film is pressed against a core, wherein a side edge of the width direction of the polymer film is subjected to a knurling process. The winding method comprises the steps of: blowing air to a polymer film wound around a core, the polymer film is pressed against the core by air blowing; and adjusting a width Lp of the polymer film region of the blown air, the polymer film having a width La The Lp/La value is decreased as the amount of winding of the polymer film wound around the core increases.

In accordance with the present invention, a long polymer film that provides a knurling at the side edges compresses the core and is wound around the core. The width of the polymer film is expressed in La, and the air will be blown The width of the gas polymer film region is expressed by Lp. The adjustment is carried out during the winding of the polymer film such that the Lp/La value decreases as the winding amount of the polymer film wound around the core increases. Therefore, it can prevent the side edges of the polymer film from being elongated and the winding deviation to wind the polymer film in a bundle.

Preferred embodiments of the invention are detailed below. However, the invention is not limited thereto.

As shown in FIG. 1, the winding unit 10 is disposed on the downstream side of the film production line 12. The knurling roller 14 and the edge cutting device 15 are sequentially located on the upstream side between the film production line 12 and the winding unit 10. The film production line 12 produces a long film 16 as follows. A coating liquid containing triacetyl cellulose (TAC) as a polymer and a solvent is cast onto a support to form a cast film. The cast film was peeled off from the support. The solvent was evaporated from the cast film. The film 16 produced by the film production line 12 is sent to the winding unit 10 via the embossing roll 14 and the edge cutting device 15.

As shown in Figs. 2 and 3, the embossing roller 14 forms a plurality of microprotrusions 18 on the two side edges 16a in the width direction of the long film 16 by embossing or the like. The embossing height of the protrusions 18 is represented by Hn. The protrusion 18 has, for example, a truncated cone shape. Product portion 16b is a portion of film 16 other than side edge 16a. The knurl height Hn is the height in the thickness direction of the film 16 between the top of the projection 18 and the surface of the product portion 16b. The shape of the protrusion 18 is not limited to the truncated cone. It may take various shapes such as a truncated pyramid and a dome as the shape of the protrusion 18 such that the surface of the film 16 as a waveform when viewed in the horizontal direction and appear as a lattice in an orthogonal line.

In the width direction A of the film 16, the side edge 16a of the protrusion 18 is provided thereon. The width Lm is preferably in the range of 3 to 50 mm, and more preferably in the range of 5 to 30 mm. Generally, the diameter D1 of the protrusions 18 is preferably in the range of 50 to 1000 μm, and more preferably in the range of 100 to 300 μm. The embossing height Hn of the projections 18 is preferably in the range of 1 to 100 μm, and more preferably in the range of 3 to 30 μm. The density of the projections 18 formed on the side edges 16a is preferably in the range of 20 to 1000 / cm 2 , and more preferably in the range of 50 to 200 / cm 2 .

The edge cutting device 15 shown in Fig. 1 cuts out unnecessary portions of the side ends of the film 16. The crusher is connected to the edge cutting device 15. The two side ends cut off by the edge cutting device 15 are sent to the crusher by blowing air, and are crushed into pieces therein, and are used for preparing a coating liquid or the like.

As shown in Fig. 4, the winding unit 10 is mainly composed of a rotating arm 21, a holding base 22 for rotatably holding the rotating arm 21, a core 23 fixed to each end of the rotating arm 21, a motor 24, and a pulse generator. 26. A roller for measuring tension (hereinafter referred to as a tension measuring roller) 27, a guide roller 28, a swinging roller 29, a swinging mechanism 30, a tension measuring sensor 31, an air blowing mechanism 32, and a control device 33.

The winding unit 10 continuously winds the film 16 manufactured by the film production line 12 in a bundle around the core 23 rotatably held around the arm 21 to form a film bundle 36. When the winding radius (winding thickness) R1 of the film bundle 36 reaches a predetermined length, it cuts the film 16 at a predetermined position by a film cutter (not shown) or the like. The winding unit 10 also provides an unillustrated covering means for causing the front end of the film 16 thus removed to contact and surround the hollow core 23 fixed to the front end of the rotating arm 21. The arm 21 is rotated a predetermined degree at the winding position to fix the core 23, the film 16 The front end is wrapped around it. Conversely, the film bundle 36 around which the film 16 is wound is completely secured to the removal position. The film bundle 36 is removed together with the core 23 at the removal position, and then the hollow core 23 is fixed to the front end of the arm 21.

The motor 24 causes the core 23 fixed to the winding position to rotate. When the core 23 is rotated clockwise in the drawing, the film 16 is wound around the core 23 into a film bundle 36. A winding speed of the film 16 is controlled by a motor driver or the like (not shown).

The pulse generator 26 connects one of the conveying rollers 37 disposed in the film conveying path, and converts the occurrence of the rotation of the conveying roller 37 and the turning time point into a pulse signal. It should be noted that this time point is at the end of the rotation, that is, when the new core 23 is fixed to the end of the arm 21. The pulse signal is sent to the control device 33. The control device 33 counts the number of pulses of the pulse signal, and then calculates the winding amount of the film 16 around the core 23 to calculate the winding radius R1 of the film bundle 36 based on the calculation result of the winding amount.

The tension measuring roller 27 and the guide roller 28 are disposed on the upstream side of the conveying roller 37 in the conveying direction of the film 16. In the drawing, the oscillating roller 29 is movably held by the oscillating mechanism 30 in the vertical direction between the tension measuring roller 27 and the guide roller 28. The tension measuring sensor 31 is connected to the tension measuring roller 27. The tension measuring sensor 31 detects the degree of winding tension applied to the film 16 wound around the film bundle 36. The swing mechanism 30 adjusts the degree of winding tension when the film 16 is wound by adjusting the weight applied to the swing roller 29.

In this case, in the case where the winding tension applied to the film 16 is too strong, the winding pressure of the film bundle 36 becomes strong, and thus black line defects and winding wrinkles occur on the film. Conversely, in the case where the winding tension applied to the film 16 is too weak, The winding pressure of the film bundle 36 is weakened, so that the winding deviation occurs in the width direction of the film bundle 36. In the above, the control device 33 controls the swing mechanism 30 based on the detection signal from the tension measuring sensor 31 such that the winding tension applied to the film 16 is within a predetermined range of the winding speed and thickness of the corresponding film 16.

Further, the control device 33 controls the swing mechanism 30 to lower the winding tension applied to the film 16 as the winding radius R1 of the film bundle 36 is increased. Therefore, it is possible to prevent the black line defects and the winding wrinkles caused by the additional winding tension from being wound around the film 16.

The air blowing mechanism 32 blows air toward the surface of the film 16 while winding the film 16 around the film bundle 36. The film 16 can be wound around the core 23 or the film bundle 36 by the air blowing by pressing the film 16 against the core 23 or the film bundle 36 at a predetermined pressure and forcibly removing the entrained air in a non-contact manner. Therefore, the air blowing mechanism 32 is disposed in the vicinity of the winding start position PR where the film 16 is wound around the film bundle 36.

The air blowing mechanism 32 is composed of an air nozzle 40, a blower 42, a first moving mechanism 43, and an ion generator 45. The blower 42 is connected to the air nozzle 40 via the air pipe 41. The first moving mechanism 43 moves the air nozzle 40. The ion generator 45 is disposed in the air nozzle 40 and generates ions. It should be noted that although not shown in the drawings, the middle portion of the air pipe 41 provides an automatic valve for controlling air blowing, a dehumidifier for adjusting air humidity (dew point), a heat exchanger for adjusting air temperature, and the like.

The control device 33 controls the blower 42 as a source of blown air so that the blower 42 generates air at a predetermined pressure. The air generated by the blower 42 passes through the air pipe 41 at a fixed air pressure (blowing pressure) in the width direction of the slit 40a. The air is blown toward the peripheral surface of the film 16 near the winding start position PR through the slit 40a of the air nozzle 40. Therefore, the air entrained by the film bundle 36 can be removed in a non-contact manner so that the winding radius R1 of the film bundle 36 is fixed in the circumferential direction of the film bundle 36.

The control device 33 controls the first moving mechanism 43 such that the first moving mechanism 43 moves the air nozzle 40 as the winding radius R1 increases to maintain the distance between the slit 40a and the surface of the film 16. The first moving mechanism 43 can be any mechanism as long as it can move the air nozzle 40.

The ion generator 45 includes a plurality of needle electrodes (not shown). The control device 33 controls the ion generator 45 such that high voltage is applied to the needle electrode to free the air in the vicinity of the electrode. Thus, ion-containing air can be blown toward the surface of the film 16. While the film 16 wound around the film bundle 36 may be electrically contacted by sliding contact with a plurality of transfer rolls during transport on the film transport path, it may be electrostatically removed from the film 16 by blowing ion-containing air to reduce the amount of charge of the film 16. As a result, damage due to foreign matter due to foreign matter can be prevented. It should be noted that the ion generator 45 can be any generator as long as it can generate ions (ie, free air). In the case where the amount of charge of the film 16 is extremely small, the ion generator 45 can be omitted to blow normal air toward the film 16.

As shown in Figures 5 and 6, the air nozzle 40 has a slit 40a through which air is delivered. The air nozzle 40 is configured such that the slit 40a faces the film 16 wound around the film bundle 36. Between the slit 40a and the film 16, the air shielding member 50 is disposed in the vicinity of one side edge of the film 16, and the air shielding member 51 is disposed in the vicinity of the other side edge of the film 16. The air shielding members 50 and 51 shield the air supplied through the slit 40a.

The air shielding members 50 and 51 are movably disposed between an allowable position (see FIG. 5A) and an air shielding position (see FIG. 5B). The air shielding members 50 and 51 at the allowable positions pass the air supplied through the slit 40a toward the film 16. The air shielding members 50 and 51 located at the air shielding position shield the air supplied through the slit 40a toward the respective side ends of the width direction A of the film 16. The side ends of the film 16 in the width direction A may be all of the side edges 16a or a part of the side edges 16a (e.g., the side edges 16a are outside the width direction A). Further, in addition to the side edges 16a, the side ends of the width direction A of the film 16 may include a portion of the product portion 16b. The control device 33 controls the second moving mechanism 53 such that the second moving mechanism 53 moves the air shielding members 50 and 51 between the allowable position and the air shielding position. The control device 33 causes the second moving mechanism 53 to adjust the Lp/La value within a predetermined range, wherein La is the width of the film 16, and Lp is the width of the film 16 region of the air supplied through the slit 40a to effectively transfer the film. 16 is pressed against the film bundle 36. The control device 33 can adjust the amount of decrease in the Lp/La value according to the increase amount of the winding radius R1, or decrease the Lp/La value at a predetermined rate from the start of winding the film 16.

Next, the operation of the above specific embodiment will be described. As shown in Fig. 1, in the film production line 12, the film 16 is produced by a solution casting method and sent to the embossing roll 14. The knurling roller 14 provides a predetermined knurl to the side edge 16a of the film 16 (see Fig. 2). The edge cutting device 15 cuts out unnecessary portions of the respective side ends of the film 16 other than the side edges 16a of the embossing. The film 16 through which unnecessary portions of the respective side ends are cut is sent to the winding unit 10.

As shown in FIG. 4, it fixes the core 23 to the turn in the winding unit 10. Each end of the arm 21. The front end of the film 16 produced by the film production line 12 is brought into contact with the core 23 by means of a coating device not shown. The control device 33 then drives the first moving mechanism 43 to move the air nozzle 40 to a predetermined position. Further, the control device 33 drives the ion generator 45 to release the air inside the air nozzle 40, and further drives the swing mechanism 30 so that the winding tension at the time of starting the winding of the film 16 becomes a predetermined value. Control device 33 then drives motor 24 to begin winding film 16 at a predetermined winding speed. The winding tension can be arbitrarily determined depending on the manufacturing conditions. At a winding speed of the film 16 of about 100 m/min, the film 16 has a film thickness of about 80 μm, a film width of 1340 mm, and a total winding length of 4000 mm, for example, winding when the film 16 is wound. The tension is preferably set to 410 Newtons, and the winding tension at the time of winding the film 16 is preferably set to 350 Newtons.

After the winding of the film 16 is started, the control device 33 calculates the winding radius R1 of the film bundle 36 based on the pulse signal transmitted from the pulse generator 26. The control device 33 then drives the first moving mechanism 43 such that the distance D2 between the slit 40a and the peripheral surface of the film bundle 36 is maintained at an approximately fixed value within a predetermined range based on the winding radius R1. The distance D2 is preferably in the range of 3 to 30 mm, and more preferably in the range of 5 to 15 mm.

When the winding radius R1 of the film bundle 36 reaches a predetermined value and the winding of the film 16 is ended, the control device 33 stops driving the blower 42 and drives the first moving mechanism 43 to retract the air nozzle 40 to a predetermined position. Next, the film 16 is cut at a predetermined position using a film cutter (not shown). When the film 16 is cut, the front end of the thus-cut film 16 is brought into contact and covered by the hollow core 23 at the front end of the arm 21 by means of a coating device. Rotating the arm 21 a predetermined degree The core 23 is fixed to the winding position and the film bundle 36, which is completely surrounded by the film 16, is fixed to the removal position. The empty core 23 is fixed to the end of the arm 21 after the film bundle 36 is removed at the removal position.

Next, the film 16 around the core 23 or the film bundle 36 is wound up. As shown in Fig. 5A, at the start of winding of the film 16, the control device 33 controls the second moving mechanism 53 so that the air shielding members 50 and 51 are at the allowable positions. Thus, the width La and the width Lp are approximately equal to each other. Further, the control device 33 drives the blower 42 to generate air at a predetermined pressure and blows the ion-containing air to a surface of the winding start position PR of the film 16 surrounding the film bundle 36 at a pressure of 2 to 10 kPa. The film 16 is thus pressed against the core 23 or the film bundle 36 and wound around the core 23 or the film bundle 36. It is preferred to blow air to the film 16 at the beginning of winding the film 16. Since the ion-containing air is blown to the film 16, it is possible to remove the air entrained by the film bundle 36 in an uncontacted manner without using a mounting roller. In addition, the static electricity of the film 16 can be eliminated at the same time.

As the film 16 is continuously wound around the film bundle 36, a difference 55 in height H occurs on the film 16 wound around the peripheral surface of the film bundle 36, as shown in Fig. 7. The step 55 is extended in the circumferential direction of the film 16 wound around the peripheral surface of the film bundle 36. The step difference 55 appears at a position Le from the side of the film bundle 36 to the length Le. That is, the length Le is the distance between the periphery of the film bundle 36 and the position where the step difference 55 occurs. The length Le is attributed to the thickness of the film 16, the knurl height Hn (see Fig. 3), and the like. With the winding of the film 16, that is, as the winding radius R1 increases, the length Le becomes longer (see Fig. 7).

According to the present invention, as shown in FIG. 5B, as the winding radius R1 increases, the second moving mechanism 53 moves the air shielding members 50 and 51 to the air shielding. The position reduces the distance between the air shielding member 50 and the air shielding member 51. As a result, the suppression intensity at the position where the step difference 55 occurs can be reduced. Therefore, according to the present invention, the film 16 can be prevented from being pressed by the stress caused by the step 55 and wound around the film bundle 36. Therefore, troubles such as elongation of the side edges of the film 16 due to stress can be prevented. The side edge elongation means a phenomenon in which the inner side region of the side edge of the film is elongated toward the product end in the film width direction A. It should be noted that the control means 33 controls the second moving mechanism 53 to move the air shielding members 50 and 51 so that the Lp/La value becomes preferably in the range of 0.9 to 0.99, and more preferably in the range of 0.92 to 0.97.

Although in the above specific embodiment, the second moving mechanism 53 arbitrarily moves the air shielding members 50 and 51 such that the Lp/La value is within a predetermined range, the present invention is not limited thereto. For example, the air shielding members 50 and 51 may be configured such that they are satisfied by Lp La-2 x Lm is of the formula wherein Lm is the width of the width side edge 16a. Therefore, the air blown toward the surface of the film 16 through the slit 40a and flowing to the side edge 16a is shielded by the air shielding members 50 and 51. As a result, air is not blown toward the side edge 16a. Conversely, the air flowing to the product portion 16b is not obscured by the air shielding members 50 and 51 and is blown toward the product portion 16b. Only the product portion 16b of film 16 is compressed and wound around core 23 or film bundle 36. Therefore, it is possible to prevent the embossing height Hn from causing stress to press the film 16 and wind around the core 23 or the film bundle 36. Therefore, troubles such as elongation of the side edges of the film 16 due to stress can be prevented.

Although the air shielding members 50 and 51 are provided between the slit 40a and the film bundle 36 in the above specific embodiments, the present invention is not limited thereto. Other specific embodiments of the invention are described below. The same components as the above specific embodiments The components are denoted by the same reference numerals and the detailed description thereof will be omitted. As shown in Fig. 8, the air nozzle 140 includes a pair of fins 141 as guiding members in the air passage 140b through which the air passes to the film bundle 36. One of the fins 141 is disposed at one end of the air passage 140b in the width direction A, and the other end is disposed at the other end of the air passage 140b in the width direction A. Each of the fins 141 has a guiding surface 141a and a shaft 141b. The guiding surface 141a is for guiding the air that has passed through the air tube 41 toward a predetermined direction. Each fin 141 is rotatable about a shaft 141b between a guiding position and a retracted position. When the fins 141 are in the guiding position, they use the guiding surface 141a to guide the air flowing in the width direction A toward the respective side ends of the film 16 to a region closer to the central portion of the film 16 with respect to the side ends of the width direction. When the fin 141 is in the retracted position, the fin pair 141 is retracted from the guided position. The control device 33 causes the rotation mechanism 142 to rotate the fins 141 such that the guiding angle θ1 is within a predetermined range. It should be noted that the guiding angle θ1 is between the guiding surface 141a of the fin 141 at the retracted position and its guiding surface 141a at the guiding position. At the start of winding of the film 16, the control device 33 controls the rotation mechanism 142 such that the rotation mechanism 142 causes the fin pair 141 to rotate to increase the guide angle θ1 in accordance with the increase in the winding radius R1 of the film bundle 36. As a result, the Lp/La value can be lowered. Therefore, stress due to the step difference 55 can be prevented. Therefore, the film 16 can be prevented from being wound around the film bundle 36 such as the elongation of the side edges of the film 16 and the winding deviation due to stress.

According to the above embodiment, since the width of the slit 40a is approximately equal to the film bundle 36, the guide surface of the fin as the guiding member is approximately perpendicular to the peripheral surface of the film bundle 36 at the retracted position. However, the invention is not limited thereto. In the case where the width of the slit 40a is longer than the film bundle 36 and other cases, the guiding member is received The return position may be a position at which the guiding surface is inclined toward the central portion of the film 16 in the width direction A. Conversely, in the case where the width of the slit 40a is shorter than the film bundle 36 and other cases, the retracted position of the guiding member may be a position at which the guiding surface is inclined toward the respective side ends of the film 16 in the width direction A.

Although the fin pair 141 is provided inside the air passage 140b of the air nozzle 140 in the above specific embodiment, the present invention is not limited thereto. A pair of fins 141 may be provided between the slit 140a and the bundle of membranes 36. In addition, the plurality of fins 141 can be arranged and controlled by the rotating mechanism 142. Further, the Lp/La value can be adjusted by moving the fins 141 in the width direction A.

Although in the above specific embodiment, each of the fins 141 is provided inside the air passage 140b of the air nozzle 140, the present invention is not limited thereto. It is also possible to configure a member for adjusting the width of the air passage of the air nozzle, and to move the member to adjust the Lp/La value. This member will hereinafter be referred to as an air passage member. As shown in FIG. 9, for example, the air nozzle 160 has a slit 160a through which air is supplied, and a pair of air passage members 162 and 163 are provided inside the air nozzle 160 such that one of the width directions A is located inside the air nozzle 160. One end, and the other at the other end. Separately, the air passage member 162 has a surface 164 and the air passage member 163 has a surface 165. Surfaces 164 and 165 form the inner wall surface of air passage 160b. The distance between the surfaces 164 and 165 is the width of the air passage 160b in the width direction A. Surface 164 is comprised of first surface 164a and second surface 164b. Surface 165 is comprised of first surface 165a and second surface 165b. The distance between the first surface 164a and the first surface 165a is approximately fixed in the air flow direction B. Conversely, the distance between the second surface 164b and the second surface 165b is along the air flow The moving direction B gradually increases. The pair of air passage members 162 and 163 are connected to each other without moving mechanism, and are movable in the width direction A. The control device 33 controls the unillustrated moving mechanism such that the moving mechanism is not moved to move the air passage members 162 and 163 to reduce the distance between the surface 164 and the surface 165 as the winding radius R1 of the film bundle 36 increases, that is, the air passage 160b is pressed. The width of the width direction A. Therefore, the Lp/La value can be reduced.

It should be noted that the angle θ2 between the first surface 164a and the second surface 164b may be arbitrarily adjusted for the purpose of adjusting the Lp/La value. The wind speed distribution of the air blown toward the film 16 can be lowered from the central portion of the film toward the side end thereof in the width direction A by the adjustment angle θ2. Therefore, it is possible to prevent the film from being wound up due to the stress caused by the step, the elongation of the side edges, and the occurrence of the winding deviation.

In the above specific embodiment as shown in Fig. 4, the air is blown toward the surface of the film 16 at a right angle. However, the angle between the air and the surface of the film 16 may be a predetermined angle of inclination. When the swing mechanism that can adjust the tilt angle to a predetermined range is provided in the air blowing mechanism, it can wind the film 16 by adjusting the tilt angle to a predetermined range.

It should be noted that although in the above specific embodiment, the number of the air blowing mechanisms 32 (air nozzles 40) provided on the peripheral surface of the film bundle 36 is one, the present invention is not limited thereto. It can provide two or more air blowing mechanisms 32.

As for the air outlet for supplying air to the film 16, it is provided in the above embodiment a slit 40a whose opening width is approximately fixed in the direction of the vertical width direction A, as shown in Fig. 6. However, the invention is not limited thereto. It can provide an opening width from the direction of the vertical width direction A The air outlet is added to the side end of the central portion instead of the slit 40a. It should be noted that the air outlet is not limited to the seam. Air outlets with other shapes are also available. In addition, a plurality of openings can be provided as air outlets. In this case, it provides openings each having a predetermined shape and size at a particular pitch to adjust the open area of the air outlet. As a result, the wind speed distribution of the air can also be adjusted to a predetermined range.

Although the above embodiment has blown air to the region of the film 16 near the winding start position PR, the present invention is not limited thereto. Air may also be blown to the region of the film 16 on the downstream side of the winding start position PR.

It should be noted that although the above embodiment uses the first moving mechanism 43 to move the air nozzle 40 to adjust the distance D2 between the slit 40a and the peripheral surface of the film bundle 36 to a predetermined range, the present invention is not limited thereto. It can move the clamping base 22 to adjust the distance D2 to within a predetermined range.

Although the above specific embodiment is explained using the winding unit 10 of the two-axis turret type, the present invention is not limited thereto. The present invention is also applicable to a winding unit of a single-shaft turret type or a three- or more-axis turret type.

The film 16 produced by the film production line 12 preferably has a length in the longitudinal direction (casting direction) of at least 100 meters. Further, the width of the film 16 is preferably at least 600 mm, and more preferably in the range of 1400 to 2500 mm. Furthermore, the invention is also effective for films having a length of more than 2500 mm. The present invention is also applicable to the case of producing a film 16 having a thickness as thin as 40 to 60 μm.

Although the above specific embodiments describe methods and units for winding TAC films produced by solution casting, the invention is not limited thereto. The present invention is also applicable to a method and unit for winding a polymer film other than a TAC film. In addition, the polymer film can be manufactured not only by solution casting but also by any Known methods, such as melt extrusion.

[material]

Deuterated cellulose is used as a polymer in this particular embodiment. The best deuterated cellulose is triethyl cellulose (TAC). More preferably, the degree of thiol substitution of the hydrogen atom of the hydroxyl group in the cellulose of the deuterated cellulose satisfies all of the following formulas (I) to (III):

In the above formulae (I) to (III), "A" represents the degree of substitution of a hydrogen atom to an ethyl hydrazine group in the hydroxyl group of the cellulose, and "B" represents a hydrogen atom pair in the hydroxyl group of the cellulose having 3 to 22 carbon atoms. The degree of substitution of the thiol group of an atom. Preferably, at least 90% by weight of the TAC particles have a diameter ranging from 0.1 mm to 4 mm. It should be noted that the polymer which can be used in the present invention is not limited to deuterated cellulose. The polymer may be any known substance as long as the substance is soluble in a solvent and as a coating liquid.

The cellulose has glucose units constituting the β-1,4 bond, and each glucose unit has a free hydroxyl group at the second, third and sixth positions. Deuterated cellulose is a polymer in which a part or all of a hydroxyl group is esterified such that a hydrogen atom is substituted with a mercapto group having two or more carbon atoms. The degree of thiol substitution in deuterated cellulose indicates the degree of esterification of the hydroxyl group at each of the second, third, and sixth positions in the cellulose (when all (100%) hydroxyl groups at the same position are substituted, the substitution of this position The degree is 1).

The total substitution degree of the thiol group, that is, DS2+DS3+DS6, is preferably in the range of 2.00 to 3.00, more preferably in the range of 2.22 to 2.90, and the best is Range of 2.40 to 2.88. Further, DS6/(DS2+DS3+DS6) is preferably at least 0.28, more preferably at least 0.30, and most preferably in the range of 0.31 to 0.34. It should be noted that DS2 is the degree of substitution of a hydrogen atom to a thiol group in the hydroxyl group at the second position of each glucose unit (hereinafter also referred to as the degree of thiol substitution at the second position), and DS3 is the hydroxyl group at the third position of each glucose unit. The degree of substitution of a hydrogen atom to a thiol group (hereinafter also referred to as the degree of thiol substitution at a third position), and DS6 is the degree of substitution of a hydrogen atom to a thiol group at a hydroxyl group at the sixth position of each glucose unit (hereinafter also referred to as The degree of thiol substitution at the six positions).

In the present invention, the type of the thiol group in the deuterated cellulose may be one or more. When there are two or more mercapto groups in the deuterated cellulose, it is preferred that one is an ethyl group. The DSA+DSB value is preferably in the range of 2.22 to 2.90 when the total degree of substitution of the hydroxy-p-ethyl group and the fluorenyl group other than the ethylidene group in the second, third and sixth positions is represented by DSA and DSB, respectively. More preferably, it is in the range of 2.40 to 2.88. Further, the DSB is preferably at least 0.30, and more preferably at least 0.7. The percent substitution of hydroxyl groups at the sixth position in the DSB is at least 20%, preferably at least 25%, more preferably at least 30%, and most preferably at least 33%. Further, the DSA+DSB value of the hydroxyl group at the sixth position in the deuterated cellulose is preferably at least 0.75, more preferably at least 0.80, and most preferably at least 0.85. A solution (coating liquid) excellent in solubility can be prepared using this deuterated cellulose satisfying the above conditions. In particular, since a non-chlorine organic solvent can be used to produce an excellent solution, it can produce a coating liquid having a low viscosity and excellent filtration power.

The cellulose as the deuterated cellulose material can be obtained from cotton wool or wood pulp.

According to the present invention, for deuterated cellulose, a mercapto group having at least 2 carbon atoms may be an aliphatic group or an aryl group, and is not particularly limited. As for 醯 Examples of celluloses which are alkylcarbonyl esters, alkenylcarbonyl esters, aromatic carbonyl esters, aromatic alkylcarbonyl esters and the like. The deuterated cellulose may also be an ester having other substituents. Preferred substituents are, for example, propyl, butyl, pentyl, hexyl, octyl, decyl, dodecyl, tridecyl, tetradecyl, hexadecane, An octadecyl decyl group, an isobutyl fluorenyl group, a tert-butyl fluorenyl group, a cyclohexanecarbonyl group, an oil sulfhydryl group, a benzamyl group, a naphthylcarbonyl group, a cinnamyl group, and the like. More preferably, it is a propyl fluorenyl group, a butyl fluorenyl group, a dodecyl fluorenyl group, an octadecyl fluorenyl group, a tertylene fluorenyl group, an oil fluorenyl group, a benzamyl group, a naphthylcarbonyl group, a cinnamyl group, and the like. In particular, it is preferably a propyl group and a butyl group.

As the solvent for preparing the coating liquid, it is an aromatic hydrocarbon (for example, benzene, toluene, etc.), a halogenated hydrocarbon (for example, dichloromethane, chlorobenzene, etc.), an alcohol (for example, methanol, ethanol, n-propanol, n-butanol, Diethylene glycol or the like), a ketone (e.g., acetone, methyl ethyl ketone, etc.), an ester (e.g., methyl acetate, ethyl acetate, propyl acetate, etc.), an ether (e.g., tetrahydrofuran, methyl acesulfame, etc.). It should be noted in the present invention that the coating liquid represents a polymer solution or dispersion obtained by dissolving or dispersing a polymer in a solvent.

The halogenated hydrocarbon preferably has from 1 to 7 carbon atoms, and it is most preferred to use dichloromethane. Regarding the physical properties of TAC, such as solubility, stripping force of cast film self-supporting body, mechanical strength of film, and optical properties of film, it is preferred to use at least one carbon atom with 1 to 5 carbon atoms together with dichloromethane. Alcohol. The content of the alcohol relative to the total solvent is preferably in the range of 2% by weight to 25% by weight, and more preferably in the range of 5% by weight to 20% by weight. The alcohol to be used is, for example, methanol, ethanol, n-propanol, isopropanol, n-butanol or the like, and particularly preferably among them, methanol, ethanol, n-butanol, and a mixture thereof.

Recently, in order to minimize the negative impact on the environment, it is proposed to have no solvent for methylene chloride. In this case, the solvent is preferably an ether having 4 to 12 carbon atoms, a ketone having 3 to 12 carbon atoms, an ester having 3 to 12 carbon atoms, and an alcohol having 1 to 12 carbon atoms. The solvent also contains a mixture thereof. For example, the mixed solvent contains methyl acetate, acetone, ethanol, and n-butanol. It should be noted that the ether, ketone, ester, and alcohol may have a ring structure. As the solvent, a compound having at least two of its functional groups (i.e., -O-, -CO-, -COO-, and -OH) can be used.

The details of the deuterated cellulose are described in paragraphs [0140] to [0195] of Japanese Patent Laid-Open Publication No. 2005-104148. This description is also applicable to the present invention. In addition, the details of solvents and additives (such as plasticizers, degradation inhibitors, UV absorbers, optical anisotropy control agents, hysteresis control agents, dyes, matting agents, release agents, release modifiers, etc.) are also described in the same announcement. [0196] to [0516].

[Example]

The following Experiments 1 to 4 were carried out as an example of the present invention. The winding methods, evaluation methods, and conditions of the methods of Experiments 1 to 4 are described below. Experiments 1 through 4 carried out a winding procedure for winding the film 16 around the core 23 to form a film bundle 36. The side edge elongation and the winding hardness of the obtained film bundle 36 were evaluated. The experiment of the present invention uses a cellulose acetate film having a length of 4000 m, a thickness of 60 μm, and a width La of 1500 mm as the film 16. The height Hn of the protrusion formed on the side edge of the film 16 by the knurling procedure is in the range of 5 micrometers to 10 micrometers. The winding speed was set to 100 m/min in the winding process. The control unit 33 controls the components such that the air pressure of the blower 42 gradually decreases. low. Specifically, the air pressure is approximately 8 kPa at the start of winding of the film 16, and is approximately 7 kPa at the end of winding the film 16. The winding tension at the start of winding the film 16 was set to about 410 Newtons, and the winding tension at the end of winding the film 16 was set to about 350 Newtons. Further, the control device 33 controls the second moving mechanism 53 so that the second moving mechanism 53 moves the air shielding members 50 and 51 to lower the width Lp of the blowing air region in the width direction A of the film 16 as the winding radius R1 increases. In the experiments 1 to 4, the Lp/La value at the time of starting the winding of the film 16 was set to 1, and the Lp/La value at the time of ending the winding of the film 16 was changed in Experiments 1 to 4. The Lp/La values after the completion of winding of the film 16 in Experiments 1 to 4 are shown in Table 1.

Each side edge elongation and winding hardness of the obtained film bundle 36 were evaluated. As for the evaluation of the edge elongation, the film width Lx of the film 16 was measured to calculate the Lx/La value. The Lx/La value was evaluated based on the following criteria.

A: Lx/La<100.1%

B: 100.1% Lx/La<100.4%

C: Lx/La 100.4%

As for the evaluation of the winding hardness, in order to evaluate whether or not the film 16 is wound at a suitable winding hardness, it is checked whether or not the winding radius R1 of the film bundle 36 is fixed in the peripheral direction of the film bundle 36 after the winding of the film 16 is completed. Specifically, as shown in FIG. 10, each operator measures the length R _u and the winding radius of R _L. In the drawings, the winding radius R _u and the film is completely wound core 36 of the bundle 23 extends in upward direction from the film around the. In the drawing, the core 23 of the film bundle 36 around which the winding radius R _L is completely wound is extended in the downward direction. The difference ΔR between the winding radii R _u and R _{L is} calculated based on the measurement result. The difference ΔR is evaluated based on the following criteria.

A: △R<2 mm

B: 2 mm △R<5 mm

C: △R 5 mm

As shown in Table 1, the elongation of the side edges can be prevented by winding the film 16 around the core 23 by blowing air at a predetermined blowing width. Further, by adjusting the positions of the respective air shielding members 50 and 51 such that the Lp/La value is within a predetermined range, it is possible to prevent the side edge elongation from occurring and to wind the film 16 in a suitable winding hardness.

Various changes and modifications are possible in the present invention and are intended to be within the scope of the present invention.

10‧‧‧Winding unit

12‧‧‧ film production line

14‧‧‧Rolling Roller

15‧‧‧Edge cutting device

16‧‧‧film

16a‧‧‧lateral edge

16b‧‧‧Products section

18‧‧‧ Protrusion

21‧‧‧Rotating arm

22‧‧‧Clamping base

23‧‧‧nuclear

24‧‧‧Motor

26‧‧‧Pulse generator

27‧‧‧Tensometer Roll

28‧‧‧ Guide roller

29‧‧‧Swing roller

30‧‧‧swing mechanism

31‧‧‧Tensometric sensor

32‧‧‧Air blowing mechanism

33‧‧‧Control device

36‧‧‧ film bundle

37‧‧‧Transfer roller

40‧‧‧Air nozzle

40a‧‧‧ stitching

41‧‧‧ trachea

42‧‧‧hair dryer

43‧‧‧First mobile agency

45‧‧‧Ion generator

50‧‧‧Air shielding members

51‧‧‧Air shielding members

53‧‧‧Second mobile agency

55‧‧ ‧ paragraph difference

140‧‧‧Air nozzle

140b‧‧ Air passage

141‧‧‧Fins

141a‧‧‧Guided surface

141b‧‧‧Axis

142‧‧‧Rotating mechanism

160‧‧‧Air nozzle

160a‧‧‧ stitching

160b‧‧ Air passage

162‧‧‧Air passage components

163‧‧‧Air passage members

164‧‧‧ surface

164a‧‧‧ first surface

164b‧‧‧ second surface

165‧‧‧ surface

165a‧‧‧ first surface

165b‧‧‧second surface

The above and other objects and advantages of the present invention will become more apparent from the detailed description of the appended claims appended claims Portion, and wherein: FIG. 1 is an explanatory view schematically showing a film production line and a winding unit in accordance with an embodiment of the present invention; Figure 2 is a plan view schematically showing the side edges of the embossed film; Fig. 3 is a cross-sectional view taken from the line III-III along the second drawing, schematically showing the side edges of the embossed film. Fig. 4 is an explanatory view schematically showing the winding unit; Fig. 5A is an explanatory view schematically showing the vicinity of the air hole and the film bundle of the air nozzle when the shielding member is at the allowable position, and Fig. 5B is abbreviated An explanatory view of the vicinity of the air hole and the film bundle of the air nozzle when the shielding member is in the air shielding position is shown; FIG. 6 is a plan view schematically showing the air hole of the air nozzle; FIG. 7 is a schematic view showing the horizontal direction of the film bundle FIG. 8 is an explanatory view schematically showing an air nozzle according to a second embodiment of the present invention; and FIG. 9 is a view schematically showing an air nozzle according to a third embodiment of the present invention. An explanatory diagram; and Fig. 10 is a schematic explanatory view of the evaluation of the winding hardness of the film bundle.

23‧‧‧nuclear

33‧‧‧Control device

36‧‧‧ film bundle

40‧‧‧Air nozzle

40a‧‧‧ stitching

50‧‧‧Air shielding members

51‧‧‧Air shielding members

53‧‧‧Second mobile agency

Claims (6)

A polymer film winding unit for winding a polymer film around the core when the elongated polymer film is pressed against the core, the side edge of the polymer film in the width direction is subjected to a knurling process, and the polymer film roll The winding unit includes: an air blowing device for blowing air toward the polymer film wound around the core, the polymer film pressing the core by air blowing; and adjusting a region of the polymer film that blows the air a width Lp adjusting device, the polymer film having a width La; and a control device for controlling the adjusting device to decrease the Lp/La value as the winding amount of the polymer film wound around the core increases; The adjusting device includes: a pair of guiding members each having a rotating shaft and a guiding surface for guiding the air toward the predetermined direction, the pair of guiding members being rotatable about the rotating shaft between the guiding position and the retracting position, such that at the guiding position The pair of guiding members guide the air flow to the side end of the polymer film in the width direction to the side end opposite to the width direction to be closer to the central portion of the polymer film And the region of the guiding member retracted from the guiding position at the retracted position; and the guiding surface of the guiding member at the guiding position and the guiding of the guiding member at the retracted position An angle adjustment mechanism for forming an angle θ of the surface, the angle adjustment mechanism being controlled by the control device such that the angle θ increases as the amount of winding increases. One for winding around the core when the elongated polymer film is pressed against the core a polymer film winding unit of the polymer film, the side edge of the polymer film in the width direction receives a knurling process, and the polymer film winding unit comprises: a polymer for blowing air around the core An air blowing device for film, the polymer film pressing the core by air blowing; an adjusting device for adjusting a width Lp of the polymer film region blowing the air, the polymer film having a width La; and for controlling the Adjusting means for lowering the Lp/La value with an increase in the winding amount of the polymer film wound around the core; wherein the air blowing means comprises an air passage having air holes such as slits extending in the width direction, And an inner wall surface member for constituting one of the air passages facing the inner wall surface, the pair of inner wall surfaces extending in a direction perpendicular to the width direction, and the adjusting means including the inner wall surface member at the width a moving mechanism for moving the movement mechanism for moving the inner wall surface member by the control device such that the distance between the pair of inner wall surfaces increases with the winding amount Decreases. The polymer film winding unit of claim 1 or 2, wherein the control device controls the adjusting device such that when the polymer film is wound around the core, the Lp/La value is about 1, and When the polymer film is wound around the core, the Lp/La value is in the range of 0.9 to 0.99. The polymer film winding unit of claim 1 or 2, further comprising a moving mechanism for the air blowing device and the core At least one of the movements is such that the distance between the surface of the polymer film when wound around the core and the pore disposed at the air blowing means is approximately fixed within a range of 5 to 15 mm. A method for winding a polymer film around a core of a polymer film when a long polymer film is pressed against a core, the side edge of the polymer film receiving a knurling process in a width direction, the winding method The method comprises the steps of: blowing an air to the polymer film wound around the core by an air blowing device, the polymer film pressing the core by air blowing; and adjusting the polymer film blowing the air by using an adjusting device a width Lp of the region, the polymer film having a width La such that the Lp/La value decreases as the winding amount of the polymer film wound around the core increases; wherein the adjusting device comprises: each having a rotating shaft and a pair of guiding members for guiding the air toward a guiding surface in a predetermined direction, the pair of guiding members being rotatable about the rotating shaft between the guiding position and the retracting position, such that the pair of guiding members guiding the air flow direction at the guiding position The side end of the polymer film in the width direction to the side end opposite to the width direction is closer to a region of the central portion of the polymer film, and in the retracted position Retracting the pair of guiding members from the guiding position; and adjusting an angle of the angle θ formed by the guiding surface of the guiding member at the guiding position and the guiding surface of the guiding member at the retracted position The mechanism, the angle adjustment mechanism is controlled by the control device such that the angle θ increases as the winding amount increases. A method for winding a polymer film around a core of a polymer film when a long polymer film is pressed against a core, the side edge of the polymer film receiving a knurling process in a width direction, the winding method The method comprises the steps of: blowing an air to the polymer film wound around the core by an air blowing device, the polymer film pressing the core by air blowing; and adjusting the polymer film blowing the air by using an adjusting device a width Lp of the region, the polymer film having a width La such that the Lp/La value decreases as the winding amount of the polymer film wound around the core increases; wherein the air blowing device includes having pores such as An air passage extending in the width direction slit, and an inner wall surface member for constituting one of the air passages to the inner wall surface, the pair of inner wall surfaces extending in a direction perpendicular to the width direction, and the adjusting device includes a moving mechanism for moving the inner wall surface member in the width direction, and the moving mechanism for moving the inner wall surface member is controlled by the control device such that the pair of inner wall surfaces The distance between the winding amount increases and decreases.