JP2006225160A - Film winder and winding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate static electricity by static eliminators arranged in the vicinity of a film roller. <P>SOLUTION: This winder 53 of a biaxial turret system is arranged on the most downstream side of a film manufacturing line, and is composed of a turret arm 100, a holding stand 103 for rotatably holding a rotary shaft 102 installed in the center of the turret arm 100, winding cores 108a and 108b respectively installed on winding shafts 106a and 106b arranged on both ends of the turret arm 100, and the air supply type static eliminators 117 and 118. Since the static eliminators 117 and 118 are respectively installed on the rotary shaft 102 so as to be opposed to the winding shafts 106a and 106b, when winding a film 82 on the film roller 121, the static electricity can be eliminated in the vicinity of the film roller 121. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a turret type film winding apparatus and a winding method for winding a film in a roll shape.

  Generally, a plastic film used for a polarizing plate protective film for a liquid crystal display (LCD) is manufactured by a solution film forming method. In a film production line for producing a plastic film using this solution casting method, for example, a polymer such as cellulose acylate is dissolved in a solvent together with various additives such as a plasticizer, a UV absorber and a slip agent to form a dope. To do. Then, the dope is cast onto a drum or a band which is an endless endless support, and is peeled off when having self-supporting properties. Next, the peeled soft film is dried with hot air while being conveyed by a plurality of pass rollers to form a film.

  The formed film is continuously sent to the film take-up device located on the most downstream side of the line, where it is used as a cylindrical take-up core made of resin, metal, wood, cardboard, etc. Accordingly, it is wound up to a length of several hundred m to several thousand m. And it is suitably packed with the form of the film roll wound up by roll shape, and becomes a product form (for example, refer patent document 1).

  As the film winding device, a turret type winding device is usually used so that continuous production can be performed. This turret type film winding apparatus includes, for example, a turret that holds a plurality of winding shafts on which winding cores are set, as described in Patent Document 2. During film winding, when one winding core at the film winding position becomes full, the turret is intermittently rotated to set the next winding core at the winding position. The film being conveyed can be continuously wound.

At this time, the film is charged with static electricity due to sliding contact with a large number of pass rollers arranged in the film transport path. As a result, the floating dust is attracted by static electricity so as to be in the air, so that foreign matter may adhere to the film and foreign matter failure may occur. Therefore, for example, as described in Patent Document 3, it is usual to dispose a static eliminator in the vicinity of the film winder to neutralize the film being conveyed.
JP 2002-220143 A (page 4, FIG. 1) Japanese Patent Laid-Open No. 2002-212808 (page 4, FIG. 2) JP 2002-255409 A (5th page, FIG. 1)

  By the way, with the recent improvement of the quality of LCDs, the quality requirements for LCD polarizing plate protective films from LCD manufacturers have become strict. For this reason, in the conventional static elimination method in which a static eliminator is disposed in the vicinity of the film take-up device, the static elimination of the film is not performed sufficiently or when the film is wound around the film roll, There is a risk of charging again due to sliding contact with the roll. As a result, for example, when performing secondary processing such as coating for imparting functionality to the film, unevenness of the surface of the film or minute foreign matter adhering to the film may cause spots on the coating surface. There is a risk of failure.

  Therefore, it is preferable to dispose the static eliminator in the vicinity of the film roll so that the static electricity on the film can be sufficiently removed, so that the static can be removed while winding the film on the film roll. In the film winding device, when the turret is intermittently rotated, a retracting mechanism for retracting the static eliminator from the vicinity of the film roll is required. As a result, the manufacturing cost of the apparatus increases.

  An object of the present invention is to provide a film winding apparatus and a winding method that are capable of performing static elimination with a static eliminator always disposed in the vicinity of a film roll.

  A turret arm intermittently rotated by a rotating shaft; and a plurality of winding shafts provided on the turret arm for winding a long film in a roll shape, wherein one winding at the winding position of the film When the film has been wound on the shaft, the turret arm is intermittently rotated to move the next winding shaft to the winding position, thereby continuously winding the film. It is equipped with the static elimination means attached to the said rotating shaft, and neutralizing the surrounding surface of the film roll wound up by the said winding shaft at the time of winding of the said film.

  Moreover, it is preferable that the said static elimination means is attached with two or more in the position facing each of the said some winding shaft. Furthermore, it is preferable that the static elimination means performs the static elimination by blowing air containing ions onto a peripheral surface of the film roll.

  Moreover, it is preferable that the air blowing opening formed in the static eliminating unit is formed to have a length longer than a length in the width direction of the film roll. Furthermore, the mounting position of the static eliminating means is such that the distance between the air blowing opening and the peripheral surface of the film roll is 500 mm at the start of winding of the film, and 30 mm when winding of the film is completed. Is preferably adjusted.

  In addition, the present invention includes a turret arm that is intermittently rotated by a rotation shaft, and a plurality of winding shafts that are provided on the turret arm and winds a long film in a roll shape, and is provided at the winding position of the film. When winding of the film onto one winding shaft is completed, the turret arm is intermittently rotated to move the next winding shaft to the winding position, thereby continuously winding the film. In the film winding method, the film roll is wound around the winding shaft in a roll shape, and the peripheral surface of the film roll wound up using a static eliminator attached to the rotating shaft is discharged. .

  The film winding apparatus and winding method according to the present invention, when winding a long film around a winding shaft provided on a turret arm in a roll shape, winds it with a static eliminator attached to the rotating shaft of the turret arm. Since the peripheral surface of the taken film roll is neutralized, it is always possible to eliminate static electricity in the vicinity of the film roll. Thereby, the charging potential of the film wound up on the film roll can be kept low. As a result, when performing coating for imparting functionality to the film, variations in the surface potential of the film, and minute coatings on the film 82 cause coating spots on the coating surface or cause a coating failure. You can avoid it.

  In addition, when the turret arm is intermittently rotated, it is not necessary to provide a retracting mechanism for retracting the static eliminator from the vicinity of the film roll, so that the manufacturing cost of the apparatus can be kept low. Furthermore, it is not necessary to secure an installation space for installing a static eliminator in the vicinity of the film roll or on the film transport path, so that the apparatus can be miniaturized.

  Hereinafter, embodiments of the present invention will be described in detail. However, the present invention is not limited to the embodiments listed here.

[material]
In the present embodiment, cellulose acylate is used as the polymer, and triacetyl cellulose (TAC) is particularly preferable as the cellulose acylate. Among cellulose acylates, those in which the substitution degree of the acyl group with respect to the hydrogen atom of the hydroxyl group of cellulose satisfies all of the following formulas (1) to (3) are more preferable. In the following formulas (1) to (3), A and B represent the substitution degree of the acyl group with respect to the hydrogen atom of the hydroxyl group of cellulose, A is the substitution degree of the acetyl group, and B is 3 to 3 carbon atoms. 22 is the substitution degree of the acyl group. In addition, it is preferable that 90 mass% or more of TAC is a particle | grain of 0.1 mm-4 mm.
(1) 2.5 ≦ A + B ≦ 3.0
(2) 0 ≦ A ≦ 3.0
(3) 0 ≦ B ≦ 2.9
The polymer used in the present invention is not limited to cellulose acylate.

  Solvents for preparing the dope include aromatic hydrocarbons (eg, benzene, toluene, etc.), halogenated hydrocarbons (eg, dichloromethane, chlorobenzene, etc.), alcohols (eg, methanol, ethanol, n-propanol, n-butanol, Diethylene glycol, etc.), ketones (eg, acetone, methyl ethyl ketone, etc.), esters (eg, methyl acetate, ethyl acetate, propyl acetate, etc.) and ethers (eg, tetrahydrofuran, methyl cellosolve, etc.). In the present invention, the dope means a polymer solution or dispersion obtained by dissolving or dispersing a polymer in a solvent.

  Among these, halogenated hydrocarbons having 1 to 7 carbon atoms are preferably used, and dichloromethane is most preferably used. In addition to dichloromethane, one kind of alcohol having 1 to 5 carbon atoms is used from the viewpoint of physical properties such as solubility of TAC, peelability from cast film support, mechanical strength of film, and optical properties of film. It is preferable to mix several kinds. 2 mass%-25 mass% are preferable with respect to the whole solvent, and, as for content of alcohol, 5 mass%-20 mass% are more preferable. Specific examples of the alcohol include methanol, ethanol, n-propanol, isopropanol, n-butanol and the like, but methanol, ethanol, n-butanol or a mixture thereof is preferably used.

  By the way, recently, for the purpose of minimizing the influence on the environment, studies have been conducted on the solvent composition when dichloromethane is not used. For this purpose, ethers having 4 to 12 carbon atoms, 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 are preferably used. These may be used in combination as appropriate. For example, a mixed solvent of methyl acetate, acetone, ethanol, and n-butanol can be mentioned. These ethers, ketones, esters and alcohols may have a cyclic structure. A compound having two or more functional groups of ether, ketone, ester, and alcohol (that is, —O—, —CO—, —COO—, and —OH) can also be used as the solvent.

  The details of cellulose acylate are described in paragraphs [0140] to [0195] of JP-A-2005-104148. These descriptions are also applicable to the present invention. The same applies to additives such as solvents and plasticizers, deterioration inhibitors, UV absorbers (UV agents), optical anisotropy control agents, retardation control agents, dyes, matting agents, release agents, release accelerators and the like. The details are described in paragraphs [0196] to [0516] of JP-A-2005-104148.

[Dope production method]
First, a dope is manufactured using the above raw materials. FIG. 1 shows a dope production line 10. The dope production line 10 has a solvent tank 11 for storing the solvent, a dissolution tank 12 for mixing the solvent and TAC, a hopper 13 for supplying TAC, and an additive for storing the additive. An additive tank 14 is provided. Furthermore, the heating apparatus 15 for heating the swelling liquid mentioned later, the temperature controller 16 which adjusts the temperature of the prepared dope, and the filtration apparatus 17 are provided. Further, a flash device 30 for concentrating the prepared dope, a filtration device 31 and the like are also provided. A recovery device 32 for recovering the solvent and a regeneration device 33 for regenerating the recovered solvent are provided. The dope production line 10 is connected to a film production line 40 via a stock tank 41.

  The dope is manufactured by the following method using the dope manufacturing line 10. First, the valve 18 is opened, and the solvent is sent from the solvent tank 11 to the dissolution tank 12. Next, the TAC contained in the hopper 13 is fed into the dissolution tank 12 while being measured. In addition, the required amount of the additive solution is sent from the additive tank 14 to the dissolution tank 12 by opening and closing the valve 19.

  In addition to the method of sending the additive as a solution, for example, when the additive is liquid at room temperature, it can be sent to the dissolution tank 12 in the liquid state. Further, when the additive is solid, a method of feeding into the dissolution tank 12 using a hopper or the like is also possible. When a plurality of types of additives are added, a solution in which a plurality of types of additives are dissolved can be placed in the additive tank 14. Alternatively, a solution in which an additive is dissolved can be put in each of a plurality of additive tanks and sent to the dissolution tank 12 through independent pipes.

  In the above description, the order of putting into the dissolution tank 12 is the solvent (used in the meaning including the case of the mixed solvent), the TAC, and the additive, but it is not limited to this order. For example, a preferred amount of solvent can be fed after the TAC is metered into the dissolution tank 12. Further, it is not always necessary to add the additive to the dissolution tank 12 in advance, and it can be mixed in a mixture of TAC and a solvent (hereinafter, these mixtures may also be referred to as dope) in a later step.

  As shown in FIG. 1, the dissolution tank 12 includes a jacket 20 that wraps the outer surface thereof, and a first stirrer 22 that is rotated by a motor 21. Furthermore, as shown in FIG. 1, it is preferable that a second agitator 24 that is rotated by a motor 23 is attached to the dissolution tank 12. The first stirrer 22 is preferably provided with an anchor blade, and the second stirrer 24 is preferably a dissolver type eccentric stirrer. The melting tank 12 is adjusted in temperature by flowing a heat transfer medium inside the jacket 20, and a preferable temperature range is −10 ° C. to 55 ° C. By appropriately selecting and using the types of the first stirrer 22 and the second stirrer 24, the swelling liquid 25 in which the TAC is swollen in the solvent is obtained.

  Next, the swelling liquid 25 is sent to the heating device 15 by the pump 26. The heating device 15 is preferably a jacketed pipe, and further preferably has a configuration capable of pressurizing the swelling liquid 25. By using such a heating device 15, the dope 27 is obtained by dissolving the solid content in the swelling liquid 25 under heating conditions or under pressure and heating conditions. Hereinafter, this method is referred to as a heating dissolution method. In this case, the temperature of the swelling liquid 25 is preferably 50 ° C to 120 ° C. Moreover, the cooling dissolution method which cools the swelling liquid 25 to the temperature of -100 degreeC--30 degreeC can also be performed. TAC can be sufficiently dissolved in a solvent by appropriately selecting the heating dissolution method and the cooling dissolution method. After the dope 27 is brought to about room temperature by the temperature controller 16, the dope 27 is filtered by the filtering device 17 to remove impurities contained in the dope 27. The filtration filter used in the filtration device 17 preferably has an average pore diameter of 100 μm or less. The filtration flow rate is preferably 50 L / hour or more. The dope 27 after filtration is sent to a stock tank 41 in a film production line 40 through a valve 28 and stored therein.

  By the way, as described above, the method of once preparing the swelling liquid 25 and then using the swelling liquid 25 as the dope 27 requires a longer time as the concentration of TAC is increased, which is problematic in terms of manufacturing cost. There is a case. In that case, it is preferable to prepare a dope having a concentration lower than the target concentration and then perform a concentration step for obtaining the target concentration. When using such a method, the dope filtered by the filtering device 17 is sent to the flash device 30 via the valve 28, and a part of the solvent in the dope is evaporated in the flash device 30. The solvent gas generated by the evaporation is condensed by a condenser (not shown) to become a liquid and is recovered by the recovery device 32. The recovered solvent is regenerated as a dope preparation solvent by the regenerator 33 and reused. This reuse is effective in terms of cost.

  Further, the concentrated dope 27 is extracted from the flash device 30 by the pump 34. Furthermore, it is preferable that a bubble removal process is performed to remove bubbles generated in the dope 27. As this defoaming method, various known methods are applied, for example, an ultrasonic irradiation method. The dope 27 is subsequently sent to the filtering device 31 to remove foreign matter. In addition, it is preferable that the temperature of dope 27 in the case of filtration is 0 degreeC-200 degreeC. The dope 27 is sent to the stock tank 41 and stored.

  By the above method, the dope 27 whose TAC concentration is 5 mass% to 40 mass% can be manufactured. More preferably, the TAC concentration is from 15% by mass to 30% by mass, and most preferably from 17% by mass to 25% by mass. The concentration of the additive (mainly a plasticizer) is preferably in the range of 1% by mass or more and 20% by mass or less when the total solid content in the dope is 100% by mass. In addition, about the raw material in the solution casting method which obtains a TAC film, a raw material, the additive dissolution method and addition method, the filtration method, the dope manufacturing methods such as defoaming, paragraph [0517] of JP-A-2005-104148 To [0616] paragraph. These descriptions are also applicable to the present invention.

[Solution casting method]
Next, a method for producing a film using the dope 27 obtained above will be described. FIG. 2 is a schematic view showing a film production line 40. However, the present invention is not limited to the film production line as shown in FIG. The film production line 40 includes a stock tank 41, a filtration device 42, a casting die 43, a casting band 46 stretched around rotating rollers 44 and 45, a tenter dryer 47, and the like. Further, an ear-cutting device 50, a drying chamber 51, a cooling chamber 52, a film winding device (hereinafter simply referred to as a winding device) 53, and the like are arranged.

  An agitator 61 that is rotated by a motor 60 is attached to the stock tank 41. The stock tank 41 is connected to the casting die 43 via the pump 62 and the filtration device 42.

As a material of the casting die 43, precipitation hardening type stainless steel is preferable, and its thermal expansion coefficient is preferably 2 × 10 ⁻⁵ (° C. ⁻¹ ) or less. And what has the corrosion resistance substantially equivalent to SUS316 in the forced corrosion test with the electrolyte aqueous solution can be used as the material of the casting die 43, and further immersed in a mixed solution of dichloromethane, methanol and water for 3 months. Even if it has corrosion resistance, no pitting (perforation) occurs at the gas-liquid interface. Furthermore, it is preferable that the casting die 43 is manufactured by grinding a material that has passed one month or more after casting. As a result, the dope 27 flows uniformly in the casting die 43, and streaks and the like are prevented from occurring in the casting film described later. The finishing accuracy of the wetted surface of the casting die 43 is preferably 1 μm or less in terms of surface roughness, and the straightness is preferably 1 μm / m or less in any direction. The slit clearance of the casting die 43 can be adjusted in the range of 0.5 mm to 3.5 mm by automatic adjustment. About the corner | angular part of the liquid-contacting part of the lip | tip end of the casting die 43, R is 50 micrometers or less over the whole width. The shear rate in the casting die 43 is preferably adjusted to be 1 (1 / second) to 5000 (1 / second).

  The width of the casting die 43 is not particularly limited, but is preferably 1.01 to 1.3 times the width of the film as the final product. Moreover, it is preferable to attach a temperature controller to the casting die 43 so that the temperature during film formation is maintained at a predetermined temperature. The casting die 43 is preferably a coat hanger type. Furthermore, it is more preferable that thickness adjusting bolts (heat bolts) are provided at predetermined intervals in the width direction of the casting die 43 and the casting die 43 is provided with an automatic thickness adjusting mechanism using a heat bolt. The heat bolt is preferably formed into a film by setting a profile according to the amount of pump 62 (preferably a high precision gear pump) according to a preset program. Further, feedback control may be performed by an adjustment program based on a profile of a thickness meter (for example, an infrared thickness meter) (not shown) in the film production line 40. The thickness difference between any two points in the width direction of the product film, excluding the casting edge portion, can be adjusted within 1 μm, and the difference between the minimum value and the maximum value in the width direction thickness can be adjusted to 3 μm or less. Preferably, adjusting to 2 μm or less is more preferable. Moreover, it is preferable to use the one whose thickness accuracy is adjusted to ± 1.5 μm or less.

More preferably, a cured film is formed at the lip end of the casting die 43. A method for forming the cured film is not particularly limited, and examples thereof include ceramic coating, hard chrome plating, and a nitriding method. When ceramics are used as the cured film, those that can be ground, have low porosity, are not brittle, have good corrosion resistance, have good adhesion to the casting die 43, and have no adhesion to the dope are preferable. Specifically, tungsten carbide (WC), Al ₂ O ₃ , TiN, Cr ₂ O _{3 and the} like can be mentioned, among which WC is particularly preferable. The WC coating can be performed by a thermal spraying method.

  In order to prevent the dope flowing out to the slit end of the casting die 43 from locally drying and solidifying, it is preferable to attach a solvent supply device (not shown) to the slit end. In this case, a solvent for solubilizing the dope (for example, a mixed solvent of 86.5 parts by mass of dichloromethane, 13 parts by mass of acetone, and 0.5 parts by mass of n-butanol) is used at both ends of the casting bead and at the end of the die slit. And it is preferable to supply to the periphery vicinity of the three-phase contact line which external air forms. Further, it is preferable to supply each of the end portions at a rate of 0.1 mL / min to 1.0 mL / min in order to prevent mixing of foreign matters into the cast film. In addition, as a pump which supplies this liquid, it is preferable to use a pump with a pulsation rate of 5% or less.

  A casting band 46 is provided below the casting die 43 so as to span the rotating rollers 44 and 45. The rotating rollers 44 and 45 are rotated by a driving device (not shown), and the casting band 46 travels endlessly with the rotation. It is preferable that the casting band 46 can move at a moving speed, that is, a casting speed of 10 m / min to 200 m / min. In order to set the surface temperature of the casting band 46 to a predetermined value, it is preferable that the heat transfer medium circulating device 63 is attached to the rotating rollers 44 and 45. It is preferable that the surface temperature of the casting band 46 can be adjusted to -20 ° C to 40 ° C. A heat transfer medium flow path (not shown) is formed in the rotating rollers 44 and 45 used in the present embodiment, and the heat transfer medium maintained at a predetermined temperature passes through the flow path. The temperatures of the rotating rollers 44 and 45 are maintained at a predetermined value.

  The width of the casting band 46 is not particularly limited, but it is preferable to use a casting band 46 having a range of 1.05 to 1.5 times the casting width of the dope 27. The length is preferably 50 m to 150 m, the thickness is 1 mm to 5 mm, and the surface is preferably polished so that the surface roughness is 0.05 μm or less. The casting band 46 is preferably made of stainless steel, and more preferably made of SUS316 so as to have sufficient corrosion resistance and strength. Further, it is preferable to use a non-uniform thickness of the casting band 46 of 0.5% or less.

It is also possible to use the rotating rollers 44 and 45 directly as a support. In this case, it is preferable that the rotation can be rotated with high accuracy so that the rotation unevenness is 0.2 mm or less, and the average roughness of the surfaces of the rotating rollers 44 and 45 is 0.01 μm or less. preferable. Therefore, the surface of the rotating roller is subjected to chrome plating or the like so as to have sufficient hardness and durability. In addition, it is necessary to suppress the surface defect of support bodies, such as the casting band 46 and the rotating rollers 44 and 45, to the minimum. Specifically, there is no pinhole of 30 μm or more, and the number of pinholes of 10 μm or more and less than 30 μm is 1 / m ² or less, and the number of pinholes of less than 10 μm is preferably ² / m ² or less.

  The casting die 43, the casting band 46, and the like are housed in a casting chamber 64. The casting chamber 64 is provided with a temperature control facility 65 for keeping the internal temperature at a predetermined value, and a condenser (condenser) 66 for condensing and recovering the volatile organic solvent. A recovery device 67 for recovering the condensed and liquefied organic solvent is provided outside the casting chamber 64. Further, it is preferable that a decompression chamber 68 for controlling the pressure of the back surface of the casting bead formed from the casting die 43 to the casting band 46 is disposed, and this is also used in this embodiment. .

  Air blowing ports 70, 71, 72 are provided near the peripheral surface of the casting band 46 in order to evaporate the solvent in the casting film 69. Further, a wind shielding plate 73 is provided at the air blowing port 70 in the vicinity of the casting die 43 in order to suppress variation in the surface state of the casting film 69 caused by blowing dry air to the casting film 69 immediately after casting. It is preferable.

  The crossover portion 80 is provided with a blower 81, and the ear-cutting device 50 downstream of the tenter dryer 47 is used for finely cutting the waste at the side end portion (referred to as an ear) of the cut film 82. Crusher 90 is connected.

  The drying chamber 51 is provided with a number of rollers 91, and an adsorption / recovery device 92 for adsorbing / recovering the solvent gas generated by evaporation is attached. In FIG. 2, the cooling chamber 52 is provided downstream of the drying chamber 51, but a humidity control chamber (not shown) may be provided between the drying chamber 51 and the cooling chamber 52. Downstream of the cooling chamber 52, a static elimination device (static elimination bar) 93 is provided for adjusting the charged voltage of the film 82 to be within a predetermined range (for example, −2 kV to +2 kV). In FIG. 2, the example in which the static eliminator 93 is on the downstream side of the cooling chamber 52 is illustrated, but is not limited to this installation position. Furthermore, in this embodiment, a knurling roller 94 for applying knurling to both edges of the film 82 by embossing is appropriately provided downstream of the static eliminating device 93.

  An edge-cutting device 95 is disposed downstream of the knurling roller 94, and an excess of both edges of the film 82 to which knurling is given by oscillating cutting while adjusting the positions of both edges of the film 82 by an edge position controller (not shown). Cut and remove important parts. The crusher 90 described above is also connected to the ear clip device 95, but is not shown in order to prevent complication of the drawing. Further, the winding device 53 is an embodiment of the present invention. In the present embodiment, a twin-screw turret type winding machine is used so as to continuously wind up a film that is continuously conveyed, as will be described in detail later. Is used.

  Next, an example of a method for manufacturing the film 82 using the above-described film manufacturing line 40 will be described below. The dope 27 is always made uniform by the rotation of the stirrer 61. The dope 27 may be mixed with additives such as a plasticizer and an ultraviolet absorber even during the stirring.

The dope 27 is sent to the filtering device 42 by the pump 62 and filtered there, and then is cast from the casting die 43 onto the casting band 46. The driving of the rotating rollers 44 and 45 is preferably adjusted so that the tension generated in the casting band 46 is 10 ⁴ N / m to 10 ⁵ N / m. Further, the relative speed difference between the casting band 46 and the rotary rollers 44 and 45 is adjusted to be 0.01 m / min or less. The speed fluctuation of the casting band 46 is preferably 0.5% or less, and the meandering in the width direction when the casting band 46 rotates once is preferably 1.5 mm or less. In order to control the meandering, a detector (not shown) for detecting the positions of both ends of the casting band 46 is provided, and based on the measured value, feedback control is performed on a position controller (not shown) of the casting band 46, It is more preferable to adjust the position of the casting band 46. Further, it is preferable to adjust the casting band 46 immediately below the casting die 43 so that the vertical position fluctuation accompanying the rotation of the rotary roller 55 is 200 μm or less. The temperature of the casting chamber 64 is preferably set to −10 ° C. to 57 ° C. by the temperature control equipment 65. The solvent evaporated inside the casting chamber 64 is recovered by the recovery device 67 and then regenerated and reused as a dope preparation solvent.

  A casting bead is formed from the casting die 43 to the casting band 46, and a casting film 69 is formed on the casting band 46. The temperature of the dope 27 at the time of casting is preferably −10 ° C. to 57 ° C. Further, in order to stabilize the casting bead, the back surface of the casting bead is preferably controlled to a desired pressure value by the decompression chamber 68. The back surface of the bead is preferably decompressed in the range of −2000 Pa to −10 Pa than the front surface. Further, it is preferable that a jacket (not shown) is attached to the decompression chamber 68 and the temperature is controlled so that the internal temperature is kept at a predetermined temperature. The temperature of the decompression chamber 68 is not particularly limited, but is preferably set to be equal to or higher than the condensation point of the organic solvent used. A suction device (not shown) is preferably attached to the edge portion of the casting die 43 in order to keep the shape of the casting bead desired. The edge suction air volume is preferably in the range of 1 L / min to 100 L / min.

  The casting film 69 moves as the casting band 46 travels. At this time, drying air is applied to the casting film 69 by the air blowing ports 70, 71, 72, and evaporation of the solvent is promoted. The surface of the casting film 69 may fluctuate due to the blowing of the dry air, but the wind shielding plate 73 suppresses the fluctuation. The surface temperature of the casting band 46 is preferably -20 ° C to 40 ° C.

  After the casting film 69 has self-supporting properties, the casting film 69 is peeled off from the casting band 46 while being supported by the peeling roller 75 as a wet film 74. The amount of residual solvent at the time of stripping is preferably 20% by mass to 250% by mass based on the solid content. Thereafter, the transfer section 80 provided with a large number of rollers is conveyed, and the wet film 74 is fed into the tenter dryer 47. In the transfer part 80, the drying of the wet film 74 is advanced by sending the drying air of desired temperature from the air blower 81. FIG. At this time, the temperature of the drying air is preferably 20 ° C to 250 ° C. In the transition section 80, it is also possible to apply a draw tension to the wet film 74 by making the rotational speed of the downstream roller faster than the rotational speed of the upstream roller.

  The wet film 74 sent to the tenter dryer 47 is dried while being conveyed while being gripped by clips at both ends. Moreover, it is preferable to divide the inside of the tenter dryer 47 into temperature zones and adjust the drying conditions appropriately for each of the zones. It is also possible to stretch the wet film 74 in the width direction using the tenter dryer 47. Thus, it is preferable to stretch at least one direction between the casting direction and the width direction of the wet film 74 by 0.5% to 300% by the crossover 80 and / or the tenter dryer 47.

  The wet film 74 is dried to a predetermined residual solvent amount by the tenter dryer 47 and then sent downstream as a film 82. Both ends of the film 82 are cut at both edges by the ear-cutting device 50. The cut side end portion is sent to the crusher 90 by a cutter blower (not shown). By the crusher 90, the film side end portion is crushed into chips. Since this chip is reused for dope preparation, this method is effective in terms of cost. In addition, although it can also be skipped about the cutting process of this film both ends, it is preferable to carry out in any one from the said casting process to the process of winding up the said film.

  The film 82 from which both ends have been cut off is sent to the drying chamber 51 and further dried. Although the temperature in the drying chamber 51 is not specifically limited, It is preferable that it is the range of 50 to 160 degreeC. In the drying chamber 51, the film 82 is conveyed while being wound around a roller 91, and the solvent gas generated by evaporation here is adsorbed and recovered by an adsorption recovery device 92. The air from which the solvent component has been removed is blown again as dry air inside the drying chamber 51. The drying chamber 51 is more preferably divided into a plurality of sections in order to change the drying temperature. In addition, if a preliminary drying chamber (not shown) is provided between the ear opener 50 and the drying chamber 51 and the film 82 is preliminarily dried, the film temperature is prevented from rising rapidly in the drying chamber 51. The shape change of the film 82 can be further suppressed.

  The film 82 is cooled to approximately room temperature in the cooling chamber 52. A humidity control chamber (not shown) may be provided between the drying chamber 51 and the cooling chamber 52, and air adjusted to a desired humidity and temperature can be blown to the film 82 in this humidity control chamber. It is preferable. Thereby, it is possible to suppress the occurrence of curling of the film 82 and the occurrence of winding failure when winding.

  Further, the charge removing device 93 sets the charging potential while the film 82 is being conveyed to a predetermined range (for example, −2 kV to +2 kV). FIG. 2 illustrates an example provided on the downstream side of the cooling chamber 52, but the position is not limited thereto. Further, the knurling is imparted to both edges of the film 82 by embossing by the knurling roller 94. In addition, it is preferable that the unevenness | corrugation of the knurled location is 1 micrometer-200 micrometers. Then, excess portions at both edges of the film 82 to which the knurling is applied are cut and removed by the ear-cleaving device 95.

  Finally, the film 82 is wound into a roll by the winding device 53. At this time, the film 82 to be wound is preferably at least 100 m in the longitudinal direction (casting direction). Further, the width of the film 82 is preferably 600 mm or more, and more preferably 1300 mm or more and 1800 mm or less. In addition, this invention is effective also when larger than 1800 mm. The present invention is also applied when manufacturing a thin film having a thickness of 15 μm or more and 100 μm or less.

  In the solution casting method of the present invention, when casting the dope, two or more kinds of dopes can be simultaneously laminated co-casting or sequentially laminated co-casting. Furthermore, you may combine both casting. When performing simultaneous lamination and co-casting, a casting die to which a feed block is attached may be used, or a multi-manifold casting die may be used. It is preferable that at least one of the thickness of the layer on the air surface side and the thickness of the layer on the support side is 0.5% to 30% of the thickness of the entire film. When performing simultaneous lamination co-casting, it is preferable that the high-viscosity dope is wrapped with the low-viscosity dope when the dope is cast from the die slit to the support. Moreover, when performing simultaneous lamination | stacking co-casting, it is preferable that the dope which contact | connects an external field has a larger alcohol composition ratio than an internal dope among the casting beads formed from a die slit to a support body.

  From casting die, decompression chamber, support structure, co-casting, peeling method, stretching, drying conditions of each process, handling method, curl, winding method after flatness correction, solvent recovery method, film recovery method The details are described in paragraphs [0617] to [0889] of JP-A-2005-104148. These descriptions are also applicable to the present invention.

[Performance / Measurement method]
(Curl degree / thickness)
The performance of the wound cellulose acylate film and the measuring method thereof are described in paragraphs [1073] to [1087] of JP-A-2005-104148. These are also applicable to the present invention.

[surface treatment]
It is preferable that at least one surface of the cellulose acylate film is surface-treated. The surface treatment is preferably at least one of vacuum glow discharge treatment, atmospheric pressure plasma discharge treatment, ultraviolet irradiation treatment, corona discharge treatment, flame treatment, acid treatment or alkali treatment.

[Functional layer]
(Antistatic, hardened layer, antireflection, easy adhesion, antiglare)
At least one surface of the cellulose acylate film may be undercoated.

  Further, it is preferable to use the cellulose acylate film as a base film as a functional material provided with another functional layer. The functional layer is preferably provided with at least one layer selected from an antistatic layer, a cured resin layer, an antireflection layer, an easy adhesion layer, an antiglare layer and an optical compensation layer.

The functional layers preferably contain at least one surfactant 0.1mg ^{/ m 2} ~1000mg ^/ m 2 containing. Further, the functional layers preferably contain at least one sort of plasticizers in the 0.1mg ^{/ m 2} ~1000mg ^/ m 2 containing. Further, the functional layers preferably contain at least one sort of matting agents in the 0.1mg ^{/ m 2} ~1000mg ^/ m 2 containing. Further, the functional layers preferably contain at least one sort of antistatic agents ^1mg / ^{m 2 ~1000mg} / m 2 containing. In addition to the above, the method for applying a surface-treated functional layer for realizing various functions and properties on cellulose acylate film is described in paragraphs [0890] to [1072] of JP-A-2005-104148. Detailed conditions and methods are also described. These are also applicable to the present invention.

(Use)
The cellulose acylate film is particularly useful as a polarizing plate protective film. Usually, two polarizing plates each having a cellulose acylate film bonded to a polarizer are bonded to a liquid crystal layer to produce a liquid crystal display device. However, the arrangement of the liquid crystal layer and the polarizing plate is not limited, and various known arrangements can be employed. Japanese Patent Application Laid-Open No. 2005-104148 (for example, paragraphs [1088] to [1265]) describes TN type, STN type, VA type, OCB type, reflective type, and other examples in detail as liquid crystal display devices. ing. This method can also be applied to the present invention. The application also describes a cellulose acylate film provided with an optically anisotropic layer and a cellulose acylate film provided with antireflection and antiglare functions. Furthermore, the use as an optical compensation film is also described as a biaxial cellulose acylate film imparting appropriate optical performance. This can also be used in combination with a polarizing plate protective film, and these descriptions can also be applied to the present invention.

  Moreover, the cellulose triacetate film (TAC film) which is excellent in an optical characteristic by the manufacturing method of this invention can be obtained. The TAC film can be used as a polarizing plate protective film or a base film of a photographic photosensitive material. Further, it can be used as an optical compensation film for improving the viewing angle dependency of a liquid crystal display device for television. In particular, it is effective for applications that also serve as a protective film for a polarizing plate. Therefore, it is used not only in the conventional TN mode but also in the IPS mode, OCB mode, VA mode, and the like. Moreover, you may comprise a polarizing plate using the said film for polarizing plate protective films.

  Next, a two-shaft turret type winding device 53 embodying the present invention will be described with reference to FIGS. Here, FIG. 3 is a schematic view of the winding device 53, and FIG. 4 is a top view of the winding device 53 as viewed from above.

  3 and 4, the winding device 53 is roughly divided into a turret arm 100, a rotating shaft 102 attached to the center of the turret arm 100, and a holding base 103 that rotatably holds the rotating shaft 102. The winding shafts 106a and 106b provided at both ends of the turret arm 100, the winding cores 108a and 108b attached to the winding shafts 106a and 106b, the motors 109, 110a and 110b, the tension measuring roller 112, It comprises a guide roller 113, a dancer roller 114, a dancer mechanism 115, a tension measuring sensor 116, static eliminators 117 and 118, a control unit 119, and the like.

  The turret arm 100 is intermittently rotated by 180 ° about the rotation center line C of the rotation shaft 102 by a motor 109 connected to the rotation shaft 102 via a drive transmission mechanism (not shown). Thereby, the winding cores 108a and 108b attached to the winding shafts 106a and 106b of the turret arm 100 respectively wind up the film 82 in a roll shape to form the film roll 121, and the winding is completed. The film roll 121 is alternately set to a removable removal position. 3 and 4, the description will be made assuming that the winding core 108a is set at the winding position and the winding core 108b is set at the removal position.

  The winding cores 108a and 108b are attached to the winding shafts 106a and 106b, respectively, and then axial movement is restricted by stoppers (not shown) attached to the respective shafts 106a and 106b. When the winding of the film 82 is completed, the film roll 121 can be removed from the take-up shafts 106a and 106b by removing this stopper (not shown) from the shafts 106a and 106b.

  As the cores 108a and 108b, as long as the film 82 can be wound in a roll shape, the diameter and the material of the outer periphery thereof are not particularly limited. A plastic one having a diameter of 168 mm is used.

  The winding core 108a set at the winding position is driven to rotate by a motor 110a. When the winding core 108a is rotated in the clockwise direction in the drawing, the film 82 is wound on the film roll 121. Then, when the film roll 121 becomes full, the control unit 119 drives a film cutter (not shown) or the like to cut the film 82 at a predetermined position. The leading end of the cut film 82 is wound around an empty core 108b attached to the winding shaft 106b by a winding device (not shown).

  Next, the control unit 119 drives the motor 109 to rotate the turret arm 100 intermittently by 180 ° to set the winding core 108b around which the leading end of the film 82 is wound at the winding position, and the fully wound film roll 121 or The core 108a is taken out and set at the take-out position. When the film roll 121 is set at the take-out position, the film roll 121 is removed from the take-up shaft 106a. Then, a new empty winding core 108a is attached to the winding shaft 106a. The winding core 108b set at the winding position is rotated by the motor 110b to wind up the film 82.

  The tension measuring roller 112 and the guide roller 113 are arranged on the upstream side in the transport direction of the film roll 121, and a dancer roller 114 is held between the rollers 112 and 113 by the dancer mechanism 115 so as to be movable in the vertical direction in the figure. Yes. A tension measuring sensor 116 is connected to the tension measuring roller 112. The tension measuring sensor 116 detects the winding tension applied to the film 82 wound on the film roll 121. The dancer mechanism 115 adjusts the load applied to the dancer roller 114, thereby adjusting the winding tension during film winding.

  At this time, if the winding tension applied to the film 82 is strong, the winding pressure of the film roll 121 becomes strong and black stripe failure or wrinkle occurs. Conversely, if the winding tension is weak, the winding pressure becomes weak. Winding deviation occurs. Therefore, the control unit 119 performs a dancer so that the winding tension applied to the film 82 falls within a predetermined range corresponding to the winding speed and thickness of the film 82 based on the detection signal from the tension measuring sensor 116. The mechanism 115 is controlled.

  Furthermore, if the winding tension applied to the film 82 during film winding is not decreased as the winding radius (winding amount) of the film roll 121 increases, the winding pressure increases and black stripe failure or winding occurs. I'm going to have it. Therefore, the control unit 119 controls the dancer mechanism 115 to reduce the winding tension applied to the film 82 as the winding radius of the film roll 121 increases. For example, in this embodiment, the winding tension is set to be 350 N at the start of film winding, and is set to be reduced to 300 N at the end of film winding (at the time of full winding).

  At this time, as a method of detecting the winding radius of the film roll 121, for example, a pulse generator is connected to a pass roller disposed in the vicinity of the film roll 121, and the number of pulses transmitted from the pulse generator is counted. There is a method of calculating the winding amount of the film roll 121 and calculating the winding radius of the film roll 121 based on the calculation result.

  The static eliminators 117 and 118 are provided in the air nozzles 128a and 128b in which the air blowing ports 127a and 127b are formed at positions facing the winding shafts 106a and 106b, respectively, and the air nozzles 128a and 128b, and generate ions. This is an air supply type static eliminator configured to discharge static electricity by blowing air containing ions (ion wind) onto the peripheral surface of the film roll 121.

  The static eliminators 117 and 118 are preferably arranged in the vicinity of the film roll 121, but the turret arm 100 of the winding device 53 of the present invention is intermittently rotated by 180 ° every time the film roll 121 is wound. The Therefore, when the static eliminators 117 and 118 are arranged in the vicinity of the film roll 121, a retracting mechanism for retracting the static eliminators 117 and 118 is required as the turret arm 100 is intermittently rotated. The manufacturing cost of the taking device 53 is increased.

  Therefore, in this embodiment, the static eliminators 117 and 118 are attached to the rotating shaft 102 so that ion wind is blown from the vicinity of the film roll 121 without providing a retracting mechanism or the like. When each of the static eliminators 117 and 118 is attached to the rotary shaft 102, the static eliminator 117 is attached to a position facing the winding shaft 106a, and the static eliminator 118 is attached to a position facing the winding shaft 106b. Thereby, when the winding core 108a and the winding shaft 106a are set at the winding position, ion wind is blown by the static eliminator 117, and when the winding core 108b and the winding shaft 106b are set at the winding position, An ion wind can be blown by the static eliminator 118. When the turret arm 100 is intermittently rotated, the static eliminators 117 and 118 are also rotated together with the rotating shaft 102, so that the static eliminators 117 and 118 need not be retracted.

  Further, when the static eliminators 117 and 118 are respectively fixed to the rotary shaft 102, the distance between the static eliminators 117 and 118 and the peripheral surface of the film roll 121 becomes shorter as the film roll 121 gets thicker. Therefore, in this embodiment, for example, when the winding length of the film 82 is 3900 m, the distance between the air blowing ports 127a and 127b and the peripheral surface of the film roll 121 is about 500 mm at the start of film winding, The mounting positions of the static eliminators 117 and 118 are adjusted so as to be about 30 mm at the end of film winding (when full).

  The air blowing ports 127 a and 127 b are formed in a slit shape extending in a direction parallel to the rotation center line C of the rotation shaft 102. In this embodiment, the length in the longitudinal direction of the air blowing ports 127 a and 127 b is longer than the length in the width direction of the film roll 121 so that ion wind can be blown over the entire width direction of the film roll 121. Is formed.

  Air passages 132a and 132b communicating with the air blowing ports 127a and 127b are formed inside the rotary shaft 102 so that air can be supplied to the air nozzles 128a and 128b, respectively (see FIG. 4). And each ventilation path 132a, 132b is connected to opening 133a, 133b formed in the side surface of the right side in FIG. Since the openings 133a and 133b are formed at the same distance from the rotation center line C in this embodiment, when the rotation shaft 102 (turret arm 100) is intermittently rotated by 180 °, the positions of the openings 131a and 131b are also changed. Alternate. Therefore, when the ion wind is blown onto the peripheral surface of the film roll 121, the air is supplied to the opening 133a or the opening 133b on the winding position side so that the air is blown through the air passage 132a or the air passage 132b. It is ejected toward the peripheral surface of the film roll 121 from the spout 127a or the air spray 127b.

  In this embodiment, the air pipe 136 connected to the blower 135 and the air pipe 136 connected to the air pipe 136 so that air can be supplied only to the opening 133a or the opening 133b on the winding position side. , 133b is provided with a bearing member 137 that rotatably holds the end portion on the side. A ventilation path 138 connected to the air pipe 136 is formed in the bearing member 137, and the other end of the ventilation path 138 is located at a position facing the opening 133a or the opening 133b on the winding position side. It is open. Thereby, the air generated in the blower 135 is supplied only to the opening 133a or the opening 133b on the winding position side. Although not shown in the drawing of the air pipe 30, there are an automatic valve that controls the blowing of air, a dehumidifying unit that adjusts the humidity (dew point) of air, a heat exchange unit that adjusts the temperature of air, and the like. Is provided.

  The blower 135 is an air blowing source and generates high-pressure air having a predetermined pressure. At this time, the pressure of the air generated by the blower 135 is not particularly limited as long as it is a pressure at which an ion wind is blown onto the film roll 121. The air generated by the blower 135 is passed through the air pipe 136, the bearing member 137, the opening 133a or the opening 133b from the air blowing ports 127a and 127b with a uniform pressure over the longitudinal direction of the film roll 121. Sprayed on the surface.

  Although not shown, the ion generation units 130a and 130b include a plurality of needle-type electrodes. By applying a high voltage to the needle-type electrodes, the air around the electrodes is ionized. Thereby, since ions can be included in the air sent from the blower 135, an ion wind can be blown onto the peripheral surface of the film roll 121. As a result, it is possible to remove static electricity from the film 82 and reduce the amount of charge (charging potential). In the present embodiment, the static eliminators 117 and 118 perform static elimination so that the charged potential of the film 82 wound around the film roll 121 falls within the range of −2 kV to +2 kV.

  As described above, in this embodiment, by attaching the static eliminators 117 and 118 to the rotating shaft 102 of the turret arm 100, the film roll 121 always has the roll 108 a regardless of whether the core 108 a or the core 108 b is set at the winding position. Static electricity can be removed by blowing ion wind from the vicinity.

  Next, the operation of the winding device 53 of this embodiment will be described. When the leading end of the film 82 sent from the upstream side of the film transport path is wound around the core 108a by a winding device (not shown), the control unit 119 drives the ion generating unit 130a to ionize the air inside the air nozzle 128a. Then, the dancer mechanism 115 is driven so that the winding tension at the start of film winding is about 350N.

  Next, the controller 119 drives the motor 110a to start winding the film 82 at a predetermined winding speed. At the same time, the control unit 119 drives the blower 135 to generate air. Thus, ion wind is blown from the air nozzle 128a to the peripheral surface of the film roll 121 through the air pipe 136, the bearing member 137, the opening 133a, etc., and the film roll is wound around the peripheral surface of the film roll, that is, the film roll 121. 82 is neutralized (see FIG. 4). Further, when the film winding is started, the control unit 119 calculates the winding radius of the film roll 121 by the method described above. Then, the control unit 119 drives the dancer mechanism 115 to gradually reduce the winding tension as the winding radius of the film roll 121 becomes longer, so that it becomes 300 N at the end of winding (full winding). .

  Then, as shown in FIG. 5, when the film roll 121 wound around the core 108a becomes full, the control unit 119 (see FIG. 3) stops the rotation of the motor 110, and the ion generation unit 130a and The operation of the blower 135 is stopped. When the film 82 is cut at a predetermined position and the leading end thereof is wound around the empty core 108b, the control unit 119 drives the motor 109 to rotate the turret arm 100 intermittently by 180 °, thereby causing the core 108b to move. The film roll 121 is set at the winding position, and the film roll 121 after the winding is removed is set at the removal position. When the film roll 121 is set at the removal position, the film roll 121 is removed from the take-up shaft 106a, and a new empty core 108a is attached.

  When the intermittent rotation of the turret arm 100 is completed as shown in FIG. 6, the control unit 119 drives the ion generation unit 130b to ionize the air inside the air nozzle 128b, and drives the dancer mechanism 115 to drive the film winding. The winding tension at the start of winding is about 350N. Next, the controller 119 drives the motor 110b to start winding the film 82 around the core 108b, and simultaneously drives the blower 135 to generate air. As a result, ion wind is blown from the air nozzle 128b to the peripheral surface of the film roll 121 through the air pipe 136, the bearing member 137, the opening 133b, and the like, so that the film 82 wound around the film roll 121 is similarly discharged. be able to. When the film roll 121 is full, the above process may be repeated.

  In the present embodiment, the static eliminators 117 and 118 are attached to the rotary shaft 102 so as to face the winding shafts 106a and 106b, respectively. Therefore, regardless of whether the winding core 108a or the winding core 108b is set at the winding position. Ion wind can be sprayed from the vicinity of the film roll 121. As a result, the charging potential of the film 82 wound around the film roll 121 can be kept low (± 2 kV or less). As a result, when coating for imparting functionality to the film 82 is performed, variation in the surface potential of the film 82, coating spots on the coating surface due to minute foreign matter adhering to the film 82, or coating failure may occur. You can avoid it.

  Further, by attaching the static eliminators 117 and 118 to the rotating shaft 102, it is not necessary to provide a retracting mechanism for retracting the static eliminators 117 and 118 from the vicinity of the film roll 121 when the turret 100 is intermittently rotated. As a result, the manufacturing cost of the winding device 53 can be kept low. Furthermore, since it is not necessary to secure an installation space for installing the static eliminator in the vicinity of the film roll 121 or on the film transport path, the winding device 53 can be reduced in size.

  In this embodiment, an air supply type static eliminator that blows ion wind is used as the static eliminators 117 and 118, but the present invention is not limited to this, and the peripheral surface of the film roll 121 and the static eliminators 117 and 118 are not limited thereto. Various static eliminators such as a voltage application type static eliminator may be used as long as the film 82 can be sufficiently neutralized even at the start of film winding where the distance to the line 118 becomes long.

  Further, the winding device 53 of the present embodiment has been described by taking a biaxial turret type winding device as an example, but the present invention is not limited to this, and a turret type film winding method of three or more axes is used. You may apply also to an apparatus. In this case as well, the static eliminator may be attached to the rotation shaft of the turret arm or various shapes of turrets so as to face each winding shaft.

  In this embodiment, when the film 82 is wound around the film roll 121, a pressure roll such as a lion roll is pressed against the peripheral surface of the film roll 121 with a predetermined pressure to force the air that has been taken up when the film is wound. However, the present invention is not limited to this, and the lion roll may be pressed against the peripheral surface of the film roll 121. Further, instead of pressing the ray roll 121, the pressure of air (ion wind) blown from the air nozzles 128a, 128ab to the peripheral surface of the film roll 121 may be increased to perform air press.

  Further, the present invention is not limited to a film winding device of a film forming line for forming a triacetyl cellulose film, but a protective film used for a display other than an LCD, a PET (polyethylene terephthalate) film, a thermal recording paper. Further, the present invention can be applied to a film winder that winds various films such as a magnetic recording tape, a photographic film, and an adhesive tape in a roll shape.

  Hereinafter, in order to clarify the effect of the present invention, when winding the film 82 by using the winding device 53 of the present embodiment, “the present embodiment” in which static elimination is performed by the static eliminators 117 and 118, and the static eliminator. In the “comparative example” in which static elimination was not performed at 117 and 118, the charging potential “charging potential” on the peripheral surface of the film roll 121 and the occurrence of coating spots when coating was applied to the wound film 82 “application” Evaluation was made for a total of three items, namely, “spot occurrence” and occurrence of application failure due to adhesion of foreign matter “application failure”.

  The film 82 used for comparison is manufactured by the above-described film production line 40, and as shown in Table 1 below, the film thickness is 80 μm and the knurling thickness is 10 μm. What was done was used. In both of the “present example” and the “comparative example”, the film 82 was wound on a plastic core 108a, 108b having an outer diameter of 168 mm and wound by 3900 m. Further, at the time of winding the film, the winding tension at the start of winding is set to 350 N as described above, and this winding tension is decreased as the film roll 121 is thickened, so that the winding at the time of full winding is reduced. The take-up tension was set to 300N. Thus, about the film 82 wound up by the film roll 121, it evaluated by the above-mentioned three items and compared.

  In the evaluation of the “charging potential”, for example, when the film roll 121 after winding is set on a coating line (not shown) and coating is performed, the surface potential meter is placed at a position facing the film 82 fed out from the film roll 24. (Not shown) is arranged. The charged potential of the film 82 sent out from the film roll 121 was continuously measured with this surface potential meter, and the maximum value of the measured potential was listed in the evaluation column of Table 1 below.

  In the evaluation of “applied spots”, whether or not applied spots were generated on the coated surface of the film 82 after coating was confirmed visually or with an optical microscope. And when the application spot did not generate | occur | produce, it was set as "(circle)", and when the application spot had generate | occur | produced, it described as "x" and described in the evaluation column of Table 1 below.

  In the evaluation of “application failure”, it was confirmed visually or by an optical microscope whether an application failure due to adhesion of foreign matter occurred on the application surface of the film 82 after application. And it was described in the evaluation column of Table 1 below as “◎” when no coating failure occurred or “◯” when the occurrence of coating failure was significantly below the standard.

  As shown in Table 1, it was confirmed that the charge potential of the film 82 can be suppressed to within ± 2 kV by performing charge removal with the charge removers 117 and 118. In addition, it was confirmed that the occurrence of coating spots and the occurrence of coating failures due to the adhesion of foreign substances can be suppressed.

It is explanatory drawing which shows a dope manufacturing line. It is explanatory drawing which shows a film manufacturing line. It is the schematic of the winding apparatus which implemented this invention. It is the top view which looked at the winding apparatus of FIG. 3 from the upper surface. It is the schematic which showed the state by which the film roll was full. It is the schematic which showed the state by which the turret arm of the winding apparatus was intermittently rotated, and the winding of the film to the next winding core was started.

Explanation of symbols

40 Film production line 53 Winding device 82 Film 100 Turret 102 Rotating shaft 106a, 106b Winding shaft 108a, 108b Core 117, 118 Static eliminator 121 Film roll 128a, 128b Air nozzle 130a, 130b Ion generating unit

Claims (6)

A turret arm intermittently rotated by a rotating shaft; and a plurality of winding shafts provided on the turret arm for winding a long film in a roll shape, wherein one winding at the winding position of the film When the film has been wound on the shaft, the turret arm is intermittently rotated to move the next winding shaft to the winding position, thereby continuously winding the film.
A film winding apparatus, comprising: a static eliminating unit attached to the rotating shaft and configured to neutralize a peripheral surface of the film roll wound around the winding shaft during winding of the film.   2. The film winding apparatus according to claim 1, wherein a plurality of the charge eliminating means are attached at positions facing each of the plurality of winding shafts.   The film winder according to claim 1 or 2, wherein the static elimination means performs the static elimination by blowing air containing ions onto a peripheral surface of the film roll.   4. The film winding device according to claim 3, wherein the air blowing opening formed in the static eliminating means is formed to have a length longer than a length in a width direction of the film roll. .   The mounting position of the static eliminating means is adjusted so that the distance between the air blowing opening and the peripheral surface of the film roll is 500 mm at the start of winding the film and 30 mm when the film winding is finished. The film winding device according to claim 4, wherein the film winding device is provided. A turret arm intermittently rotated by a rotating shaft; and a plurality of winding shafts provided on the turret arm for winding a long film in a roll shape, wherein one winding at the winding position of the film In the film winding method for continuously winding the film by intermittently rotating the turret arm and moving the next winding shaft to the winding position when winding of the film onto the shaft is completed.
A film winding method comprising: neutralizing a peripheral surface of a film roll wound using a static eliminator attached to the rotating shaft while winding the film around the winding shaft in a roll shape.

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