TW201311364A - Metal drum, casting device, forming method of casting film and solution film preparing method - Google Patents

Abstract

The casting device of this invention is to prevent abrasion of a band and a horizontal drum and failure of thickness distortion of a film due to a weld portion of the band. A band 91 formed to be circular-like has a weld portion 91w extended in a length direction. A horizontal drum 124 for supporting the band 91 has a driving axis 124a and a drum body 124b made of stainless steel that is rotatively supported to the driving axis 124a. A band supporting surface for supporting a backside of the band is formed on an outer surface of the drum body 124b. A escape groove 124bd is disposed on the band supporting surface. The band 91 is wrapped on the drum body 124b in the way of which the weld portion 91w is located on the escape groove.

Description

Metal drum, casting device, casting film forming method and solution film forming method

The present invention relates to a metal drum, a casting device, a method for forming a cast film, and a solution film forming method.

Along with the large screen of a liquid crystal display (LCD), the optical film used in the LCD is also required to have a large area. Since the optical film is manufactured in a long strip shape, it is cut into a predetermined size in accordance with the size of the LCD. Therefore, in order to manufacture an optical film having a larger area, it is necessary to manufacture a long optical film having a larger width than before.

As a representative production method of the long optical film, there is a solution film forming method. It is known that a solution film forming method is a method in which a dope in which a polymer is dissolved in a solvent is cast onto a moving casting support, and a casting film containing a coating is formed on the casting support, and the flow is carried out. The film is peeled off from the casting support and dried to thereby produce a film.

As the casting support, a metal endless band that is stretched over a plurality of metal drums has been used. The maximum width of a film that can be produced by a solution film forming method is limited by the width of the seamless tape. Therefore, in order to manufacture a film having a larger width, a seamless belt having a larger width is required. However, only jointless belts having a width of not more than about 2 m have been obtained so far.

Therefore, in Patent Document 1, the center portion belt which is the center portion in the width direction and the pair of side belt portions which are the respective side portions are welded in the longitudinal direction, thereby obtaining a seamless belt having a larger width than before.

[Previous Technical Literature]

[Patent Literature]

[Patent Document 1] Korean Patent Publication No. 2009-0110082

However, in the case where the solution forming method is continuously performed for a long period of time (for example, 700 hours or more) as described in Patent Document 1, a scraping powder failure or a thickness deviation failure occurs. The inventors conducted diligent research and found that the scraping powder failure or the thickness deviation failure is caused by the protrusion or residual stress of the welded portion.

Furthermore, the inventors of the present invention conducted an effort to study the results, and as a result, the seamless tape as described in Patent Document 1 is likely to be warped in the width direction by the welded portion extending in the longitudinal direction. In particular, it is easy to cause the end portion in the width direction of the seamless belt, that is, to warp from the center portion to the side portion. When the solution film forming method is carried out using the seamless seam in which the end portion in the width direction is warped, the thickness variation of the cast film is caused by the warpage. Even if such a cast film having a thickness deviation is dried, a film having a thickness variation (hereinafter referred to as a thickness deviation failure) is formed.

Further, in the case where the seamless belt is placed on the metal drum in such a manner that the inner surface of the seamless belt which is bent by the warpage is in contact with the circumferential surface of the metal drum, on the side of the jointless belt The belt end is partially in contact with the circumferential surface of the metal drum. When the state in which the belt end partially contacts the circumferential surface of the metal drum continues, the deformation of the side portion of the seamless belt increases, and thus the thickness deviation failure is likely to occur.

Further, when the cast film having a thickness variation is peeled off, a peeling residual failure is likely to occur, and when the cast film having a thickness variation is dried, foaming is likely to occur.

In order to correct the warpage of the seamless belt, it is also possible to move the metal drum in a state in which the seamless belt is hung to increase the interval of the metal drum, and to increase the moving tension applied to the jointless belt. . However, if the solution film forming method is directly performed in a state where the moving tension applied to the seamless belt is increased, the film thickness deviation failure and the scraping powder failure are likely to be caused by the welded portion.

The present invention solves these problems, and an object thereof is to provide a metal drum, a casting device, a method of forming a casting film, and a solution film forming method.

The metal drum of the present invention is characterized in that it is rotatably supported; a metal seamless belt is supported by a circumferential surface, the metal seamless belt having a welded portion extending in the longitudinal direction; The circumferential surface has a groove extending in the circumferential direction in the positional region of the welded portion.

Preferably, the groove is annular. In addition, it is preferred that the bottom of the groove has a flat surface.

The casting device of the present invention is characterized in that it comprises: a pair of metal drums; the jointless belt is wound on a pair of metal drums in such a manner that the welded portion is located on the groove, and is rotated by the rotation of the metal drum Moving in the longitudinal direction; casting a mold to discharge a coating containing a polymer and a solvent onto the surface of the jointless belt; and a film dryer for applying a hot air to the casting film containing the discharged paint and formed on the surface The solvent evaporates from the cast film.

The casting device preferably includes a peeling machine that peels the cast film from the seamless tape to obtain a wet film.

Preferably, in the pair of metal drums, the metal drum facing the stripping machine is a metal drum for peeling, and is supported by the metal drum for peeling in the jointless belt. a portion of the casting film is peeled off, and the casting device includes: a peeling drum cooler to cool the metal drum for peeling; and a back cooler to move toward the metal drum for peeling The welded portion of the jointless belt is cooled from the back side.

Preferably, in the pair of metal drums, the metal drum facing the casting mold is a metal drum for casting, and the paint flowing out from the casting mold reaches the portion of the jointless belt which is supported by the casting metal drum. And the casting device includes: a casting drum cooler that cools the casting metal drum; and a surface cooler, where the coating arrives in the jointless belt and the position where the casting film is peeled off In the meantime, it is disposed opposite to the seamless belt, and the welded portion supported by the casting metal drum is cooled from the surface side.

The method for forming a cast film of the present invention is characterized in that a casting film is formed on the surface of the jointless tape by using the casting device.

The solution film forming method of the present invention is characterized in that a casting film is formed on the surface of the jointless tape by using the casting device, and the casting film is peeled off from the jointless tape to thereby produce a film.

According to the present invention, it is possible to suppress the film thickness deviation failure and the scraping powder failure caused by the welded portion, and to efficiently manufacture a belt-shaped film having a wider width than before.

In the conventional jointless belt (having a width of 2 m or less), although the welded portion is also present, the welded portion extends in the width direction. In the film obtained by using such a seamless belt, the portion which is adversely affected by the thickness variation caused by the welded portion or the like extends in the width direction in the same manner as the welded portion. Therefore, borrow By cutting the obtained strip-shaped film in the width direction, it is easy to remove a portion that is adversely affected from the product film. On the other hand, in the case of using a seamless belt having a welded portion extending in the longitudinal direction, unlike the conventional seamless belt, it is difficult to remove a portion that is adversely affected by the welded portion. According to the invention, the portion of the cast film formed on the welded portion can be contained in the film for the product.

According to the present invention, even in such a case, it is possible to suppress the film thickness deviation failure and the scraping powder failure caused by the welded portion, and to efficiently produce a belt-shaped film having a wider width than before.

The belt manufacturing apparatus 10 shown in Figs. 1 and 2 manufactures a long strip member 13 including an elongated center member 12 and side members 11 provided on both sides in the width direction of the center member 12. .

The side member 11 and the center member 12 are each a metal sheet. The side members 11 are narrow sheets of relatively narrow width. The side member 11 and the center member 12 are preferably formed of the same raw material as each other, and more preferably formed by the same raw materials and forming steps. For example, the side member 11 and the center member 12 are preferably members formed of stainless steel.

The central member 12 can also use a belt that was previously used as a casting support. The width of the center member 12 is wider than that of the side member 11, and the width of the center member 12 in the present embodiment is a constant value in the range of 1500 mm or more and 2100 mm or less, and the width of the side member 11 is 50 mm or more and 500. The range below mm is a certain value.

The belt manufacturing apparatus 10 includes a delivery portion 16, an abutting portion 17, and a welding unit 18. The heating unit 19 and the winding device 20.

(sending department)

The delivery unit 16 has a first delivery device 23 that feeds the side member 11 and a second delivery device 24 that sends out the central member 12, and the side member 11 and the central member 12 are independently sent to the abutment portion 17. The side member 11 wound in a roll shape is provided in the first delivery device 23, and the side member 11 is taken up and sent to the abutting portion 17. The central member 12 wound in a roll shape is provided in the second delivery device 24, and the central member 12 is taken up and sent to the abutting portion 17.

The abutting portion 17 abuts the side member 11 independently guided to the center member 12 such that the side edge 11e of the side member 11 and the side edge 12e of the center member 12 are in contact with each other. The abutting portion 17 preferably has a first roller 26 and a second roller 27, a third roller 28, and a fourth roller 29, which are started from the upstream side on the conveying path of the center member 12. In order to arrange, the third drum 28 is disposed on the conveyance path of the side member 11, and the fourth drum 29 is disposed on the conveyance path so as to support both the side member 11 and the center member 12.

The fourth roller 29 is a butt support roller that supports the supplied side member 11 and the center member 12 at abutting position Ph where one side edge of the side member 11 comes into contact with one side edge of the center member 12.

The second roller 27 and the third roller 28 respectively adjust the conveying path of the center member 12 and the conveying path of the side member 11 such that the center member 12 and the side member 11 are in contact with each other on the circumferential surface of the fourth roller 29.

The second roller 27 adjusts the transport path of the center member 12, and controls the passage path of the side edge 12e to be welded to the side member 11 so as to face the pair Connect to position Ph. The second roller 27 is freely movable in the width direction Y of the center member 12. The moving mechanism 32 moves the second roller 27 in the width direction Y.

A position detecting device 34 is disposed between the second roller 27 and the fourth roller 29, and the position detecting device 34 detects a passing position of one of the side edges 12e of the center member 12, and signals the detected passing position. It is sent to the controller 33. The controller 33 obtains the shift amount of the second roller 27 in the width direction Y based on the signal of the supplied passing position, and sends a signal of the shift amount to the moving mechanism 32. The moving mechanism 32 changes the inclination of the second roller 27 or the position of the second roller 27 in the width direction Y of the center member 12 in accordance with the signal of the amount of shift sent. By changing the inclination or position of the second roller 27 like this, the center member 12 is displaced in the width direction Y.

Preferably, a moving mechanism 37 is provided in the first drum 26. By the moving mechanism 37, the first roller 26 pushes the center member 12 toward the second roller 27 from one member surface. Corresponding to the displacement amount of the first roller 26, the pressing force of the first roller 26 to the central member 12 is changed, and by adjusting the pressing force, the central angle of the winding of the central member 12 wound around the second roller 27 can be controlled. . By the control of the winding center angle, the amount of displacement of the center member 12 in the width direction Y can be controlled more accurately by the second roller 27.

The third roller 28 adjusts the transport path of the side member 11, and adjusts the passage path of one side edge 11e to be welded to the center member 12 so as to face the docking position Ph. In the third drum 28, there is a direction in which the length direction is controlled. Controller 38. The controller 38 changes the longitudinal direction of the third roller 28 along the member surface of the side member 11 such that the circumferential direction of the contact region when the third roller 28 comes into contact with the side member 11 is changed, for example, by the angle θ1. An angle formed by the conveying direction X of the center member 12.

It is preferable to use the first roller 26 to the third roller 28 as described above, and control the manner in which the docking position Ph is located on the fourth roller 29. It is preferable that the first roller 26 to the third roller 28 are both driving rollers that rotate in the circumferential direction. By rotating in the circumferential direction, the first roller 26 and the second roller 27 also function as a conveying mechanism of the center member 12, and the third roller 28 also functions as a conveying mechanism of the side member 11. By setting the first roller 26 to the third roller 28 as the driving roller, the control of the conveying path of the side member 11 and the center member 12 is more reliable, and the side member 11 and the center member 12 are prevented from being in the first roller 26 to the third. Sliding on the drum 28 prevents damage to the surface of the member.

(welding unit)

The welding unit 18 welds the side member 11 supplied from the butting portion 17 to the center member 12 in a state where the side edges 11e and the side edges 12e of the respective sides are in contact with each other. By continuously supplying the abutting portion 17, a length welding step of welding the side member 11 and the center member 12 in the longitudinal direction can be performed. The welding unit 18 is provided with a welding device 42. The welding device 42 can be, for example, a laser welding device. For the laser welding device, for example, a CO ₂ laser welding device or a Yttrium Aluminum Garnet (YAG) laser welding device can be used. In the present embodiment, a case where a CO ₂ laser welding device is used as the welding device 42 will be described.

The welding device 42 emits the collected laser beam, and irradiates the side member 11 and the center member 12 to be irradiated with laser light, thereby melting and joining the side member 11 and the center member 12. The welding device 42 includes a laser oscillator 43, a welding device body 46, and a gas supply unit (not shown) that collects and emits laser light guided from the laser oscillator 43. The gas supply unit supplies CO ₂ gas when irradiating a laser. The CO ₂ gas prevents oxidation of the side member 11 and the center member 12. Further, in FIG. 2, the illustration of the laser oscillator 43 is omitted in order to avoid complication of the drawing.

Instead of a laser welding device, a Tungsten Inert Gas Welding (TIG) device can also be used. As is well known, the so-called TIG welding refers to one of arc welding using an electric arc as a heat source, and is an inert gas arc welding using an inert gas (Inert Gas) as a shielding gas and an electrode using tungsten or a tungsten alloy. Laser welding is more preferred than TIG welding. In addition, hybrid welding in which TIG welding and laser welding are combined may be employed.

In the conveyance path of the side member 11 and the center member 12, a welding support drum 41 is provided to face the ejection opening of the laser of the welding device body 46, and the welding support roller 41 supports the side member 11 and the center member 12 with a circumferential surface. . The rotation axis of the welding support roller 41 is parallel to the width direction Y of the side member 11 and the center member 12. It is preferable to set the supporting position of the side member 11 and the center member 12 of the welding support roller 41 in such a manner that the side member 11 and the center member 12 when being supported by the circumferential surface of the welding support drum 41 are irradiated with laser light. That is, it is preferable to perform welding on the welding support drum 41. Thereby, the side structure is in a state where the side edge 11e and the side edge 12e are in contact with each other. The member 11 and the central member 12 are stable, and the laser can be reliably irradiated to the portion to be irradiated.

It is preferable that the welding device body 46 is provided with a moving mechanism 50 for displacing in the width direction Y. On the upstream side of the welding device 42, a position detecting mechanism 47 that detects a contact position Ps (see FIG. 5) in which the side edge 11e of the side member 11 is in contact with the side edge 12e of the center member 12 is detected, and the detected position is detected. The signal of the contact position Ps (refer to FIG. 5) is sent to the controller 51. The position detecting mechanism 47 may be disposed in the vicinity of the conveying path from the docking position Ph to the welding device 42 (for example, the welding position Pw).

The controller 51 obtains the displacement amount of the welding device body 46 in the width direction Y based on the signal of the contact position Ps (see FIG. 5) sent, and sends a signal of the displacement amount to the moving mechanism 50. In the controller 51, when the signal of the conveyance speed of the side member 11 and the center member 12 is input, the signal of the displacement amount required to displace the welding device body 46 is sent to the moving mechanism together with the signal of the timing of the shift. 50. The moving mechanism 50 changes the position of the welding device body 46 at a predetermined timing based on the amount of shift sent and the signal of the shift timing. By changing the position of the welding device body 46 in the width direction Y as described above, the irradiation position of the laser is more precisely controlled, and the side member 11 and the center member 12 are more reliably welded. In the present embodiment, the conveying speed of the conveying side member 11 and the center member 12 to the welding device 42 is set to be in a range of 0.15 m/min or more and 20 m/min or less.

In the welding unit 18, it is more preferable to provide the chamber 52 and the cleaning device 55 as shown in Fig. 1, which separates the welding device body 46 and the welding support roller 41 from the external space, the cleaning device 55 Gas Clean it. Further, in FIG. 2, the illustration of the chamber 52 and the cleaning device 55 is omitted in order to avoid complication of the drawing. A first opening (not shown) is provided in the chamber 52, and a second opening (not shown) that discharges internal gas to the outside, the second opening to clean the gas cleaned by the cleaning device 55 Guide to the inside. The first opening and the second opening are connected to the cleaning device 55, respectively. The internal gas of the chamber 52 is directed from the first opening into the cleaning device 55, which cleans the gas directed from the chamber 52 and passes it through the second opening into the chamber 52. As such, the internal gas of the chamber 52 circulates with the cleaning device 55.

By cleaning the internal gas of the chamber 52 in advance, the welding position Pw and its periphery are cleaned, and foreign matter or the like is prevented from entering the welded portion 13w. Further, by maintaining the pressure inside the chamber 52 higher than the pressure of the external space, the inside of the chamber 52 can be more reliably maintained in a clean state. Further, by setting the welding position Pw to a position higher than the delivery portion 16, the abutting portion 17, the heating portion 19, and the winding device 20, it is possible to further prevent the foreign matter from being brought from these mechanisms.

The degree of cleanliness inside the chamber 52 is preferably, for example, set to 1000 or less of the US Federal Standard FED-STD-209D, and more preferably set to 100 or less.

(heating section)

The heating portion 19 is preferably disposed on the downstream side of the welding unit 18. The heating unit 19 is not particularly limited as long as the welded portion 13w of the belt member 13 obtained by welding is heated to a constant temperature range. In the welded portion 13w and its periphery, sometimes due to the strain caused by welding The force remains inside. The welded portion 13w or its periphery can be heated by the heating portion 19 to remove stress. By removing this stress, deformation of the welded portion 13w can be suppressed even when the solution film forming method is continuously performed for a long period of time.

The temperature of the welded portion 13w obtained by heating the heating portion 19 is not particularly limited as long as the stress is removed. For example, when the belt member 13 contains stainless steel, the temperature of the welded portion 13w is preferably 100 ° C or higher and 200 ° C. Hereinafter, it is more preferably 120 ° C or more and 180 ° C or less.

The heating unit 19 has, for example, a blower mechanism. As shown in FIG. 1, the air blowing means as the heating unit 19 has a duct 56 that blows a gas of a constant temperature, and a blower 57 that controls the temperature of the gas and then feeds the gas into the duct 56. Further, in FIG. 2, the illustration of the duct 56 and the blower 57 is omitted in order to avoid complication of the drawing.

The heating unit 19 may be provided on the opposite side of the welding support drum 41 as shown in FIG. 1 in connection with the conveyance path of the belt member 13, or may be provided on the same side as the welding support drum 41.

The belt member 13 from which the stress has been removed is sent to the winding device 20 downstream of the heating portion 19, and is wound into a roll shape. A winding core of the take-up belt member 13 is provided in the winding device 20, and a drive mechanism that rotates the winding core in the circumferential direction is provided.

The winding device 20 also functions as a welding tension control mechanism that controls the tension of the belt member 13 and the side members 11 and the center member 12 at the welding position Pw. Therefore, it is preferable to maintain the tension of the belt member 13 and the side member 11 and the center member 12 at the welding position Pw. The torque of the take-up device 20 is controlled in a certain manner. Thereby, the welded portion 13w can be set to a constant state in the longitudinal direction.

At the start of welding, for example, it is preferable to perform the following operation using the winding device 20. First, the side member 11 and the center member 12 are provided from the delivery portion 16 to the conveyance path of the winding device 20, and the respective ends of the side member 11 and the center member 12 are wound around the winding core of the winding device 20. The winding of the side member 11 and the center member 12 is started. The winding is started, and the conveying path of the side member 11 and the center member 12 is controlled to maintain the docking position Ph at a predetermined position. After the butting position Ph of the side member 11 and the center member 12 is kept constant, the welding is started by the welding device 42.

(anti-offset)

It is preferable that the welding is performed while suppressing the positional deviation of the side member 11, the center member 12, and the belt member 13. For example, instead of the welding unit 18, a welding unit 61 as shown in FIGS. 3 and 4 including a pressing device may be used. The welding unit 61 further includes a pressing device 62 in the welding unit 18 shown in FIGS. 1 and 2, and includes a moving mechanism 50, a controller 51, a chamber 52, and a cleaning device 55 similarly to the welding unit 18, but in order to avoid The illustrations are complicated, and illustration of these members is omitted in FIGS. 3 and 4. The same components and members as those in FIGS. 1 and 2 are denoted by the same reference numerals as those in FIGS. 1 and 2, and description thereof will be omitted. Further, in the welding unit 61, the chamber 52 surrounds the pressing device 62 and the welding support drum 41 to be spaced apart from the external space.

The pressing device 62 suppresses the positional displacement of the side member 11, the center member 12, and the belt member 13 at the welding position Pw, using the first belt (belt) A pair of belts 63 and a pair of belts of the second belt 64 press the side members 11, the center member 12, and the belt member 13 on the welding support drum 41.

The first belt 63 and the second belt 64 are endless belts formed in a ring shape. The first belt 63 and the second belt 64 are wound around the circumferential surfaces of the fifth roller 67 to the seventh roller 69 so as to be aligned in the respective longitudinal directions of the fifth roller 67 to the seventh roller 69. At least one of the fifth to seventh rollers 67 to 69 is set as a driving roller that rotates in the circumferential direction. By the rotation of the drive roller, the first belt 63 and the second belt 64 are conveyed while being held parallel to each other.

The fifth roller 67 to the seventh roller 69 are disposed such that the rotation axis is parallel to the rotation axis of the welding support roller 41.

In the conveyance path of the side member 11 and the center member 12, the fifth roller 67 to the seventh roller 69 are disposed in a region opposite to the side on which the fourth roller 29 and the welding support roller 41 are disposed. The fifth roller 67 is provided so as to face the conveying path of the side member 11 and the center member 12 from the fourth roller 29 toward the welding support roller 41. The sixth roller 68 is provided so as to face the conveying path of the side member 11 and the center member 12 from the welding support roller 41 toward the heating portion 19. The seventh roller 69 is appropriately disposed to determine a conveyance path of the first belt 63 and the second belt 64 from the sixth roller 68 toward the fifth roller 67.

The fifth roller 67 and the sixth roller 68 are disposed in such a manner as to convey the first belt 63 and the second belt 64 from the fifth roller 67 toward the sixth roller 68 so that the belts press the side members on the welding support roller 41 11. Central member 12 and belt member 13. For example, welding the support roller from above When the side member 11 on the 41 is welded to the center member 12, the fifth roller 67 and the sixth roller 68 are disposed such that their lower ends are located lower than the upper end of the welding support roller 41.

The conveyance path of the first belt 63 and the side member 11 and the conveyance path of the side portion 13s of the belt member 13 formed by the side member 11 are opposed to each other, and the conveyance path of the second belt 64 and the center member 12 and the center are provided. The fifth roller 67 and the sixth roller 68 are provided in such a manner that the conveying path of the central portion 13c of the belt member 13 formed by the member 12 faces each other. Thereby, the first belt 63 presses the side member 11 and the side portion 13s onto the welding support drum 41, and the second belt 64 presses the center member 12 and the center portion 13c onto the welding support drum 41.

As described above, the first belt 63 and the second belt 64 are respectively disposed opposite to the welding support drum 41, and are pressed in such a manner that the side members 11 at the welding position Pw are equal in height to the center member 12. The height of the side members 11 and the center member 12 refers to the height of the surface of each of the members 11, 12. By pressing the side member 11 and the center member 12 in a height-equal manner and performing welding in this state, the shape of the welded portion 13w can be made more uniform in the longitudinal direction and welded more reliably.

Referring to Figures 5 and 6, a face length welding step will be described in more detail. The first belt 63 and the second belt 64 are conveyed in a state of being separated from each other. The first belt 63 and the second belt 64 set the conveyance path so that the welding position Pw passes through the gap between the first belt 63 and the second belt 64. Thereby, as shown in FIG. 5, the contact position Ps at which the side edge 11e of the side member 11 comes into contact with the side edge 12e of the center member 12 passes through the gap between the first belt 63 and the second belt 64, on the first belt 63 and the The second belt 64 is welded between Pick up. In addition, the illustration of the welding device body 46 is omitted in FIG.

The interval D1 between the first belt 63 and the second belt 64 is preferably set to a range of 6 mm or more and 12 mm or less. In the cross section in the width direction Y of the side member 11 and the center member 12, the distance D2 between the contact position Ps and the first belt 63, and the distance D3 between the contact position Ps and the second belt 64 are preferably set to 3 mm or more, respectively. Less than 6 mm.

Instead of the pressing device 62, a roller (not shown) may be disposed upstream and downstream of the welding device body 46, the roller having a rotation axis parallel to the rotation axis of the welding support roller 41. In this case, the side member 11 and the center member 12 are pressed with one of the upstream rollers, and the belt member 13 is pressed with the other roller downstream, whereby the side member 11 and the center member 12 at the welding position Pw can be pressed.

As shown in FIG. 6, a weld bead 72 is formed by melting at the contact position Ps and its periphery by the heat of the welding device 42. Heat is transmitted from the weld seam 72 to both sides, and a heat-affected zone 73 that is affected by the heat of welding is generated in the side member 11 and the center member 12, respectively. The heat-affected zone 73 sometimes exhibits a property different from other regions not affected by heat, or exhibits a property different from other regions not affected by heat over time. For example, when an article having a wide thermal influence as described above is used as the casting support, when the solution film forming method is continuously performed for a long period of time, defects such as deformation of the welded portion 13w or foaming of the cast film occur.

Therefore, it is preferable that, as shown in FIG. 5, in the peripheral surface of the welding support drum 41, the high heat conductive portion 71 is formed in the passing region through which the contact position Ps passes, and the high heat conductive portion 71 includes the heat conductive side member 11 and Central member 12 Higher raw materials. Thereby, the heat from the welding device 42 (see FIGS. 3 and 4) can be diffused more quickly. Since the heat is spread faster on the side of the welding support drum 41, the width of the heat-affected zone 73 of the side member 11 and the center member 12 can be made smaller, or the depth of the heat-affected zone 73 can be made shallower.

The width D4 of the passage region set to the high heat conductive portion 71 is preferably in the range of 26 mm or more and 32 mm or less.

Further, it is more preferable that a high heat conductive portion is formed on both surfaces of the first belt 63 and the second belt 64, and the high heat conductive portion includes a material having a higher thermal conductivity than the side member 11 and the center member 12. Thereby, the size of the heat-affected zone 73 can be made smaller in the width direction or the thickness direction.

The side edge 11e of the side member 11 and the side edge 12e of the center member 12 are preferably in a state in which the welding position Pw is in close contact with the gap being 0 (zero). Therefore, it is preferable that the side member 11 and the center member 12 are formed in advance so as not to form a gap when the side edges 11e and 12e are butted together. Thereby, it is possible to more reliably manufacture the belt member having no gap in the welded portion.

The length welding step may be a continuous welding step in which welding is continuously performed only in the longitudinal direction of the side member 11 and the center member 12, and a discontinuous welding step may be performed, which is intermittently performed. When the welding is intermittently performed, the side member 11 continuously fed to the welding device 42 and the center member 12 are intermittently welded. This intermittent welding step is preferably carried out prior to the continuous welding step. In this case, the side member 11 and the center member 12 are temporarily joined by the intermittent welding step, and then joined by the continuous welding step over the entire longitudinal direction.

Temporary bonding using intermittent soldering steps, then using continuous soldering steps When the joining is performed, the side member 11 and the center member 12 are guided from the butting portion 17 (see FIGS. 1 and 2) to the welding unit 18 and intermittently welded. Further, in the case where the front surface and the back surface are set on the side member 11 and the center member 12, it is preferable that the welding using the intermittent welding step is performed on the back surface which is used as the casting surface when used as the casting support thereafter. Correspondingly, the back side corresponds to the non-casting surface. Therefore, the side member 11 and the center member 12 are conveyed so that the back surface passes through the welding device body 46 (see FIG. 1).

After the intermittent welding step, the winding device 20 is guided and wound up. Further, the welded portion may be heated by the heating portion 19 before winding. The temporary joining member (not shown) including the side member 11 and the center member 12 that has been wound by the intermittent welding step is taken up by a feeding device (not shown) and sent to the welding unit 18 again. This feeding is performed such that the surface of the temporary joining member passes through the welding device body 46 (see FIG. 1). Continuous welding is performed in the welding unit 18 to obtain the belt member 13. Further, instead of the method, the two welding units 18 may be arranged side by side in the upstream and downstream, the intermittent welding may be performed in one upstream welding unit 18, and the continuous welding may be performed in the other welding unit 18 downstream.

Sometimes, if welding is performed, the weld bead 72 is formed to be more raised than the side member 11 and the center member 12. Therefore, for the welding support roller 41 used in the case where the first step of welding one face in the longitudinal direction and the second step of welding the other face in the longitudinal direction are performed as described above, it is preferable that the image is As shown in Fig. 5, in the circumferential surface of the welding support roller 41, a groove 76 is formed in the passage region through which the contact position Ps passes. By the first step The welded portion formed by the molten weld 72 of the middle ridge passes through the groove 76 to carry the second step by transporting the side member 11 and the center member 12. Thereby, the belt member 13 which is smoother and has less residual stress can be obtained. Therefore, even if it is used for film formation by a solution, deformation of a tape which is a casting support body, or a change of a property is few, and a cast film does not foam, and the film which does not have thickness variation can be manufactured more reliably.

The width D5 of the groove 76 is preferably in the range of 6 mm or more and 12 mm or less, and the depth D6 of the groove may be about 1 mm.

In the above embodiment, the third roller 28 is used as the mechanism for adjusting the conveying path of the side member 11 in the butting portion 17, but a tapered roller 81 as shown in Fig. 7 may be used instead of the third roller 28. . The tapered roller 81 is a circular circular drum formed in such a manner that the diameter d continuously decreases from one end to the other end. The diameter d continuously decreases from one end to the other at a certain ratio. The tapered roller 81 is disposed such that the one end having the larger diameter d toward the center member 12 and the other end having the smaller diameter d face the opposite side of the center member 12 (the conveying path side of the side member 11).

The side member 11 to be conveyed is in contact with the tapered roller 81, whereby the conveyance path is changed to the direction of the arrow A of the center member 12, and is close to the center member 12. Thereby, the side member 11 is reliably conveyed to the docking position Ph (see FIGS. 1 and 2).

In the cone roller 81, it is preferable to include a drive mechanism 82 that rotates in the circumferential direction. The rotating shaft is formed by inserting the center of one end surface and the center of the other end surface. The transfer side is moved by the tapered roller 81 rotated by the drive mechanism 82 The member 11, whereby the side members are more effectively approached to the central member 12.

Instead of the third roller 28, a jig 85 as a gripping mechanism as shown in Fig. 8 may be used. Fixture 85 is provided with " A jig-shaped open jig body 86 and a pair of gripping pins 87 provided at respective tip end portions of the jig body 86 sandwich the side member 11 and hold the side member 11. The pinch pin 87 is disposed in the clip The gripping position of the side member 11 and the retracted position retracted from the gripping position are freely movable. The jig 85 is provided with the moving mechanism 88, and is set to the grip start position at the start of gripping, and to release the grip. The grip release position is free to move between them, and the jig 85 is also movably moved in the width direction Y.

At the grip start position of the jig 85, the grip pin 87 is moved to the gripping position, whereby the gripper 85 grips the side member 11. The jig 85 is brought close to the direction A toward the center member 12 in a state in which the side members 11 are held, and is conveyed downstream.

The tapered roller 81 and the jig 85 may be used to bring the center member 12 closer to the side member 11 in addition to the side member 11 being brought close to the center member 12. In this case, the central member 12 can be supported or conveyed by the conical drum 81 and the jig 85.

In the above embodiment, the side members 11 are simultaneously welded to the center member 12, and the one side member 11 may be welded to the center member 12, and the other side member 11 may be welded to the center member 12.

(band)

As shown in Fig. 9, the belt 91 (seamless belt) used as the casting support is an endless belt formed in a ring shape. The belt 91 is the length direction of the belt member 13 One end is welded to the other end. Further, the belt member 13 for producing the belt 91 can be cut into a predetermined length, and in the case where the belt member 13 is produced from the side member 11 and the center member 12 which have been previously cut into a predetermined length, it can be directly cut without cutting Make a belt 91. The diameter of the pin holes in the welded portion is preferably less than 40 μm.

The belt member 13 is preferably cut in a direction crossing the width direction Y. More preferably, the cutting is performed such that the angle formed by the cutting direction and the width direction Y is approximately 5° or more and 15° or less. The welded portion 91v in which the tip end of the belt member 13 cut in the longitudinal direction and the tip end are welded, and the angle θ2 formed in the width direction Y are substantially in the range of 5° or more and 15° or less. In the annular welding step of forming the long strip member 13 into a ring shape as described above, the welding device 42 used in the length welding step may be used, and other well-known welding devices may be used.

The belt 91 manufactured by welding includes a side portion 91s formed by the side members 11 (see FIGS. 1 to 8), and a central portion 91c formed by the center member 12 (see FIGS. 1 to 8), and side portions 91s The welded portion 91w of the central portion 91c is exposed on the front surface 91a or the back surface 91b. The welded portion 91w is a portion corresponding to the welded portion 13w. The linear welded portion 91w is preferably provided in parallel with the longitudinal direction of the belt 91. The width of the belt 91 obtained in this manner is in the range of 2000 mm or more and 3000 mm or less.

The obtained tape 91 is used for a solution film forming apparatus after polishing the surface to form a mirror surface. Next, a method of producing a film in a solution film forming apparatus will be described below. The type of the polymer is not particularly limited, and a well-known polymer which can form a film by a solution film can be used. In the following embodiments The case where deuterated cellulose is used as a polymer will be described as an example.

(solution film making equipment)

As shown in FIG. 10, the solution film forming apparatus 110 has a casting device 115, a fabric tenter 117, a film drying device 118, and a winding device 119 which forms a wet film 113 from the paint 112. The fabric tenter 117 obtains a film 116 by drying the wet film 113, which performs drying of the wet film 113, and the winding device 119 winds the film 116 onto the core.

(casting device)

As shown in FIGS. 10 and 11, the casting device 115 has a casing 121 and a casting device body disposed in the casing 121. The casting device body has a casting support unit, a partitioning unit, a casting unit, a film drying unit, and a peeling roller 122 (peeling machine).

The casting support unit includes a pair of horizontal drums 124 and 125, a belt 91 that is stretched over the horizontal drum 124 and the horizontal drum 125, and a belt movement control unit 128 (refer to FIG. 12).

The horizontal drum 124 includes a drive shaft 124a and a stainless steel drum body 124b that is coupled to the drive shaft 124a. The horizontal drum 125 includes a shaft 125a and a stainless steel drum body 125b that is axially coupled to the shaft 125a. The circumferential surface of the drum main body 124b and the drum main body 125b is formed flat.

The belt 91 is obtained by joining both ends of the belt-shaped sheet. The belt 91 can be manufactured using the belt manufacturing apparatus 10 (refer to FIG. 1) described above.

The belt 91 is preferably made of SUS316 having sufficient corrosion resistance and strength. The width of the strip 91 is, for example, preferably 1.1 of the casting width of the coating 112. More than double, 2.0 times or less. The length of the belt 91 is preferably, for example, 20 m or more and 200 m or less. The thickness of the belt 91 is preferably, for example, 0.5 mm or more and 2.5 mm or less. Further, it is preferable to use a belt having a thickness deviation of the belt 91 of 0.5% or less with respect to the thickness of the entire body. Further, a surface (hereinafter referred to as a casting surface) 91a on which the casting film is formed and a back surface 91b which is in contact with the drum main body 124b and the drum main body 125b are formed flat. In particular, the casting surface 91a is preferably ground, and the surface roughness of the casting surface 91a is preferably 0.05 μm or less.

As shown in Fig. 12, the belt movement control unit 128 is for controlling the movement or temperature of the belt 91, and includes a driving motor 128m, a shaft moving portion 128s, a load weight unit 1281c, and a drum temperature adjusting portion 128d (peeling drum cooler). , a casting drum cooler), a temperature adjustment unit 128b, and a controller 128c.

The drive motor 128m is connected to the drive shaft 124a. The controller 128c controls the drive motor 128m to rotate the drum body 124b at a predetermined speed. As the drum body 124b rotates, the belt 91 circulates in a predetermined direction, and the drum body 125b rotates as the belt 91 moves. Hereinafter, the moving direction of the belt 91 is referred to as the Z1 direction, the width direction of the belt 91 is referred to as the Z2 direction, and the vertical direction is referred to as the Z3 direction.

The moving speed V _{91a of the} casting surface 91a of the belt 91 is preferably 150 m/min or less. If the moving speed V _91a exceeds 150 m/min, it is difficult to stably form a bead. The lower limit of the moving speed V _91a can be considered in consideration of the productivity of the target film. The lower limit of the moving speed V _91a is, for example, 10 m/min.

The drive shaft 124a is freely movable between a tension applying position that is a position to apply a predetermined moving tension to the belt 91 that is mounted on the drum body 124b and the drum body 125b, and the relaxation position. The heave position is a position where the belt 91 that is mounted on the drum bodies 124b, 125b is relaxed. The shaft moving portion 128s can move the drive shaft 124a between the tension applying position and the relaxation position under the control of the controller 128c. It is preferable that the shaft moving portion 128s moves the drive shaft 124a while maintaining the state parallel to the shaft 125a.

A load cell 1281c is mounted on the drive shaft 124a. The load cell 1281c detects the external force received by the drive shaft 124a. The controller 128c reads the external force received by the drive shaft 124a from the load cell 1281c. Then, the controller 128c controls the shaft moving portion 128s based on the read external force and the value of the cross-sectional area of the built-in belt 91 so that the moving tension applied to the belt 91 becomes a predetermined force. In this manner, a moving tension that is uniform in the Z2 direction can be applied to the belt 91.

The drum temperature adjustment unit 128d includes a drum temperature adjustment unit 128da attached to the horizontal drum 124, and a drum temperature adjustment unit 128db attached to the horizontal drum 125. The drum temperature adjusting sections 128da and 128db respectively circulate the heat transfer medium adjusted to the required temperature in the flow path provided in the drum main body 124b and the drum main body 125b under the control of the controller 128c. By circulating the heat transfer medium, the temperature of the drum body 124b and the drum body 125b can be maintained at a desired temperature. The temperature of the casting surface 91a of the belt 91, particularly the portion where the casting film is formed, is preferably adjusted to be substantially constant in the range of 10 °C to 40 °C.

The belt temperature adjustment portion 128b will be described later.

As shown in FIG. 11, the partition unit includes the first to third sealing members 131 to 133. First to third sealing members 131~ 133 is disposed in order from the upstream side in the Z1 direction toward the downstream side in the casing 121. Each of the first to third sealing members 131 to 133 is provided so as to protrude from the inner wall surface of the casing 121 and protrude toward the casting surface 91a of the belt 91. By the first to third sealing members 131 to 133, the region surrounded by the inner wall surface and the casting surface 91a of the casing 121, which is surrounded by the inner wall surface and the casting surface 91a of the casing 121, is divided into a casting chamber from the upstream side toward the downstream side in the Z1 direction. 121a, drying chamber 121b, and peeling chamber 121c. Further, the airtightness of the casting chamber 121a is maintained by the first to second sealing members 131 to 132. Further, the airtightness of the drying chamber 121b is maintained by the second to third sealing members 132 to 133. The distance between the first to third sealing members 131 to 133 and the casting surface 91a is, for example, 1.5 mm or more and 2.0 mm or less.

(casting room)

A casting unit is disposed in the casting chamber 121a, and the casting unit forms the casting film 141 from the coating material 112. The casting unit includes a casting die 142 and a pressure reducing machine 143. The casting die 142 has a paint outflow port 142a that flows out of the paint 112, and is disposed above the horizontal drum 124 such that the paint outflow port 142a is close to the belt 91.

The casting die 142 flows out of the coating material 112 from the coating material outlet 142a to the belt 91. The coating material 112 that has flowed out of the coating material outlet 142a and reaches the casting surface 91a forms a liquid bead. The coating material 112 reaching the casting surface 91a is cast in the Z1 direction, and as a result, a strip-shaped casting film 141 is formed.

The pressure reducing machine 143 is for decompressing the upstream side of the liquid bead in the Z1 direction, and has a decompression chamber 143a, a decompression fan (not shown), and a suction pipe. (not shown), the decompression chamber 143a is disposed on the upstream side in the Z1 direction of the paint outflow port 142a of the casting die 142, and the decompression fan is used to suction the inside of the decompression chamber 143a. The gas is connected to the decompression fan and the decompression chamber 143a.

(drying room)

A film drying unit is disposed in the drying chamber 121b, and the film drying unit performs drying of the casting film. The film drying unit includes a first dryer 151, a second dryer 153, and a drying controller (not shown) as a film dryer that supplies predetermined drying air to the casting film 141. The first dryer 151 and the second dryer 153 are provided in order from the upstream side in the Z1 direction toward the downstream side in the drying chamber 121b. The first dryer 151 is disposed above the belt 91 that is mounted on the horizontal drum 124 and the horizontal drum 125. The second dryer 153 is disposed below the belt 91 that is mounted on the horizontal drum 124 and the horizontal drum 125.

The first dryer 151 is provided with a first air supply duct 151a and a first exhaust duct 151b. The first air supply duct 151a and the first exhaust duct 151b are disposed in order from the upstream side in the Z1 direction toward the downstream side. The first air supply duct 151a and the first exhaust duct 151b are disposed apart from the belt 91, respectively. In the first air supply duct 151b, a first air supply port that sends out the first dry air 151da is provided. The first air supply opening that opens toward the downstream side in the Z1 direction is extended from one end of the casting film 141 to the other end. In the first exhaust duct 151a, a first exhaust port through which the first dry air 151da is discharged is disposed. The first exhaust port that opens toward the upstream side in the Z1 direction extends from one end of the casting film 141 to the other end.

The second dryer 153 includes a second exhaust duct 153a and a second air supply duct 153b. The second exhaust duct 153a and the second air supply duct 153b are provided in order from the upstream side in the Z1 direction toward the downstream side. The second exhaust duct 153a and the second air supply duct 153b are disposed apart from the belt 91, respectively. In the second exhaust duct 153a, a second exhaust port through which the second dry air 153da is discharged is provided. The second exhaust port that opens toward the downstream side in the Z1 direction extends from one end of the casting film 141 to the other end. In the second air supply duct 153b, a second air supply port that sends out the second dry air 153da is provided. The second air supply opening that opens toward the upstream side in the Z1 direction extends from one end of the casting film 141 to the other end.

The drying controller independently adjusts the temperature or wind speed of the first drying air 151da and the second drying air 153da, and includes a first temperature regulating machine to a second temperature regulating machine (not shown), a first air supply fan, and a second air supply fan ( Not shown) and a controller (not shown), the first to second temperature controllers adjust the temperatures of the first dry air 151da and the second dry air 153da, the first air supply fan to the second The air blowing fan adjusts the air volume of the first dry air 151da and the second dry air 153da. The first temperature control unit to the second temperature control unit and the first air supply fan to the second air supply fan are disposed in the ducts of the first dryer 151 to the second dryer 153. The controller controls the first thermostat-second thermostat and the first air supply fan to the second air supply fan to independently adjust the temperature or wind speed of the first dry air 151da and the second dry air 153da.

(stripping chamber)

A peeling roller 122 is disposed in the peeling chamber 121c. The peeling roller 122 peels the cast film 141 which is in a peelable state from the belt 91 to obtain wetness. The film 113 sends the wet film 113 from the outlet 121co provided on the peeling chamber 121c. In this manner, the horizontal drum 124 serves as a metal drum for casting and peeling.

It is also possible to provide a condensing device and a recovery device in the casting device 115, which condenses the solvent contained in the environment inside the casing 121, and the recovery device recovers the condensed solvent. Thereby, the concentration of the solvent contained in the environment inside the casing 121 can be maintained within a certain range.

As shown in Fig. 13, a belt supporting surface 124bs that supports the back surface 91b of the belt 91 is formed on the outer peripheral portion of the drum main body 124b. In the belt supporting surface 124bs, a groove 84bd, that is, a groove extending in the circumferential direction in the positional region of the welded portion 91w is provided. The concave groove 124bd is extended in the circumferential direction and formed in a ring shape. Similarly, a belt supporting surface 125bs that supports the back surface 91b of the belt 91 is formed on the outer peripheral portion of the drum main body 125b. A concave groove 125bd is provided in the belt supporting surface 125bs. The concave groove 125bd is formed in the same shape as the concave groove 124bd, and is extended in the circumferential direction and formed in a ring shape. Further, each of the concave grooves 124bd and 125bd extending in the circumferential direction may not be annular, that is, it may be two as long as it can suppress the thickness deviation failure and the scraping powder failure caused by the welded portion. The shape of the end separation.

As shown in Fig. 14, the belt 91 is wound around the drum main body 124b so that the welded portion 91w is positioned on the concave groove 124bd. Similarly, the belt 91 is placed on the drum body 125b such that the welded portion 91w is positioned on the concave groove 125bd.

The width W _{124bd of the} concave groove 124bd may be, for example, 20 mm or more, as long as the width of the welded portion 91w is added to the belt 91 to be hung around each of the drum 124 and the drum 125. 40 mm or less. Regarding the depth D _{124bd of the} concave groove 124bd, the interval CL1 from the bottom of the concave groove 124bd to the back surface 91b of the tape 91 may be within 0.2 mm, for example, 0.03 mm or more and 0.2 mm or less. Further, the end portion 124be of the concave groove 124bd is preferably chamfered.

In the case of the belt 91, if the interval between the bottom portion 124bb of the concave groove 124bd and the belt 91 is increased, heat transfer failure to the belt 91 occurs, and if the interval between the bottom portion 124bb and the belt 91 is reduced, it is generated. The problem of contact with the welded portion 91w. Therefore, it is preferable that the bottom portion 124bb of the concave groove 124bd is flat and has a flat surface. That is, it is preferable that the bottom portion 124bb of the concave groove 124bd is parallel to the belt supporting surface 124bs. By making the bottom portion 124bb of the concave groove 124bd parallel to the belt supporting surface 124bs, the bottom portion 124bb and the belt 91 can be kept at a constant interval even in the case of the belt 91蜿蜒.

(with temperature control)

As shown in FIG. 11 and FIG. 12, the belt temperature adjustment unit 128b includes a belt surface cooler 161 disposed in the separation chamber 121c, and a belt back cooler 162 disposed in the drying chamber 121b.

As shown in FIG. 14 and FIG. 15, the belt surface cooler 161 is provided on the downstream side in the Z1 direction at a position PP (hereinafter also referred to as a peeling position) at which the casting film 141 is peeled off, and is disposed in the Z2 direction. The portion facing the concave groove 124bd, that is, the vicinity of the welded portion 91w. Here, the peeling position PP is a portion set in the belt 91 by the peeling metal drum, that is, the horizontal drum 124.

The belt surface cooler 161 includes a temperature adjustment unit 161t and a cooling nozzle 161n. And a cooling nozzle position adjusting portion 161s that adjusts the temperature of the cooling gas 161a that sends out the cooling gas 161a that is sprayed by the cooling gas 161a sent from the cooling nozzle 161n The position of the cooling nozzle 161n is adjusted so as to be attached to the welded portion 91w on the side of the casting surface 91a.

As shown in FIGS. 15 and 16, the belt back cooler 162 is a portion that is disposed in the belt 91 to move closer to the horizontal drum 124 in the Z1 direction, and is disposed in the Z2 direction with the recessed groove 124bd. The opposing portion, that is, the vicinity of the welded portion 91w.

Like the belt surface cooler 161, the belt back cooler 162 includes a temperature adjustment unit 162t, a cooling nozzle 162n, and a cooling nozzle position adjustment unit 162s that adjusts the temperature of the cooling gas 162a, and the cooling nozzle 162n sends out the cooling. In the gas 162a, the cooling nozzle position adjusting portion 162s adjusts the position of the cooling nozzle 162n so that the cooling gas 162a sent from the cooling nozzle 162n is sprayed on the welded portion 91w on the back surface 91b side.

Returning to Fig. 10, a plurality of support rollers 171 supporting the wet film 113 are arranged in the intersection between the casting device 115 and the fabric tenter 117. The support roller 171 is rotated about the axis by a motor (not shown). The support roller 171 supports the wet film 113 sent from the casting device 115 and guides it to the fabric tenter 117. Further, the case where the two support rollers 171 are arranged in the delivery portion is shown, but the present invention is not limited thereto, and one or three or more support rollers 171 may be arranged in the delivery portion. In addition, the support roller 171 may also be a free roller.

The fabric tenter 117 has both sides in the width direction of the holding wet film 113 A plurality of clamps on the rim that move over the extended track. The dry air is blown to the wet film 113 held by the jig, and the wet film 113 is stretched and dried in the width direction.

A trimming device 172 is disposed between the fabric tenter 117 and the film drying device 118. At both ends in the width direction of the film 116 sent to the trimming device 172, grip marks formed by the jig are formed. The trimming device 172 cuts off both end portions having the grip marks. The cut portion is sequentially sent to a cutting blower (not shown) and a crusher (not shown) by air blowing, and is cut finely and reused as a raw material of paint or the like.

The film drying device 118 includes a casing, a plurality of rollers 118a, and an air conditioner (not shown). The casing includes a conveying path of the film 116, and the plurality of rollers 118a form a conveying path of the film 116, and the air conditioner adjusts The temperature or humidity of the environment inside the enclosure. The film 116 introduced into the casing is conveyed while being hung on the plurality of rollers 118a. The solvent remaining in the film 116 conveyed in the casing is evaporated by adjusting the temperature or humidity of the environment. Further, an adsorption recovery device is connected to the membrane drying device 118, and the adsorption recovery device recovers the solvent evaporated from the membrane 116 by adsorption.

Between the film drying device 118 and the winding device 119, a cooling chamber 173, a destaticizing rod (not shown), a knurling roller 174, and a trimming device (not shown) are provided in this order from the upstream side. The cooling chamber 173 cools the film 116 until the temperature of the film 116 reaches approximately room temperature. The static electricity bar is subjected to destaticization treatment, that is, static electricity is removed from the charged film 116 sent from the cooling chamber 173. The knurling imparting roller 174 is assigned to both ends of the width direction of the film 116. Knurling for reeling. The trimming device cuts both ends in the width direction of the film 116 so that knurls remain at both ends in the width direction of the cut film 116.

The take-up device 119 has a pressing roll 119a and a winding core 119b. The film 116 sent to the winding device 119 is wound up on the winding core 119b while being pressed by the pressing roll 119a, and is formed into a roll shape.

Next, the action of the present invention will be described. As shown in Fig. 11, the controller 128c rotates the horizontal drum 124 by the drive motor 128m. Thereby, the belt 91 is sequentially circulated and moved in the respective chambers 121a to 121c.

(film formation step)

The casting step is performed in the casting chamber 121a, that is, the casting film 141 containing the coating material 112 is formed on the belt 91. The casting die 142 continuously flows out of the coating material 112 from the paint outflow port 142a. The discharged paint 112 forms a liquid bead from the casting die 142 to the belt 91, and is cast on the belt 91. In this manner, the casting film 141 containing the coating material 112 is formed on the belt 91.

The pressure reducer 143 can produce a state in which the pressure on the upstream side in the Z1 direction of the liquid bead is lower than the pressure on the downstream side in the Z1 direction of the liquid bead. The pressure difference ΔP in the upstream side of the liquid bead in the Z1 direction and the downstream side in the Z1 direction is preferably 10 Pa or more and 2000 Pa or less.

(film drying step)

The drying step is performed in the drying chamber 121b, that is, the predetermined drying wind is sprayed on the casting film 141 to evaporate the solvent from the casting film 141. The film drying step is performed until the casting film 141 is transported in a self-supporting state. In the film drying step, the first film drying step and the second film drying step are sequentially performed.

In the first film drying step, the solvent is evaporated from the casting film 141 until a dry layer is formed on the surface layer of the casting film 141. The first dryer 151 sends out the first dry air 151da from the first air supply port.

The casting film 141 has a drying layer and a wetting layer by the first film drying step. The dried layer is formed on the surface side of the casting film 141, and is further dried as compared with the wet layer on the side of the belt 91 located on the dryer layer. That is, the content of the solvent of the dried layer is lower than that of the wet layer. In addition, the surface of the dried layer is formed smoothly. When the casting film 141 having a dry layer is subjected to a predetermined drying step, the surface of the dried layer becomes the surface of the obtained casting film 141. Therefore, by forming a dry layer in the casting film 141 immediately after formation, a casting film 141 having a smooth surface can be obtained.

Here, the content ratio of the solvent is the amount of the solvent contained in the cast film or each film on the basis of the dry amount, and the sample is collected from the target film, and the mass of the sample is set to x, and the mass after the sample is dried. When it is set to y, it is expressed as {(xy)/y}×100% by mass.

The temperature of the first dry air 151da is preferably 30° C. or higher and 80° C. or lower. Further, the wind speed of the first dry air 151da is preferably 5 m/s or more and 25 m/s or less.

In the second film drying step, the solvent is evaporated from the casting film 141 by using the second drying air 153da until it is in a state capable of being transported by itself. The second dryer 153 flows along the film surface of the casting film 141 to flow the second dry air 153da from the downstream side in the Z1 direction to the upstream side. By causing the second dry air 153da to flow in the opposite direction to the Z1 direction as described above, the evaporation of the solvent is promoted as compared with the case of flowing in the Z1 direction. The second film drying step is preferably The casting film 141 having a solvent content of 20% by mass or more and 150% by mass or less is carried out. The temperature of the second dry air 153da is preferably 40° C. or higher and 80° C. or lower. Further, the wind speed of the second dry air 153da is preferably 5 m/s or more and 20 m/s or less.

(peeling step)

The peeling step is performed in the peeling chamber 121c, that is, the casting film 141 which is in a peelable state is peeled off from the belt 91. The peeling roller 122 peels the cast film 141 which is in a peelable state from the belt 91, and obtains the wet film 113, and the wet film 113 is sent out from the outlet 121co provided in the peeling chamber 121c. The peeling step is preferably performed on the casting film 141 having a solvent content of 20% by mass or more and 80% by mass or less.

The belt 91 is sent out from the peeling chamber 121c and then introduced into the casting chamber 121a again.

The belt 91 having the welded portion 91w is easily warped from the central portion 91c (see Fig. 9) toward the side portion 91s (see Fig. 9). When the belt 91 is warped, a part of the belt 91 floats from the horizontal drum 124 and the horizontal drum 125, and as a result, a foaming failure, a peeling residual failure, and a film thickness deviation failure are caused. As the vertical stress N acting on the belt 91 wound around the horizontal drum 124 and the horizontal drum 125 becomes larger, the amount of floating of the belt 91 on the horizontal drum 124 and the horizontal drum 125 becomes smaller. With this property, it is also possible to perform a floating amount reducing step of reducing the floating amount CL by increasing the vertical stress N.

Here, if Dr is set to the radius of the horizontal drum, T is set as the moving tension of the belt, and TH is set as the thickness of the belt, and the vertical stress N acting on the belt wound around the horizontal drum is Expression.

N=TH×T/Dr

Further, when the radius Dr of the horizontal drum 124 and the horizontal drum 125 is 1000 mm and the thickness TH of the belt is 1.6 mm, the moving tension applied to the belt 91 is, for example, 50 N/mm ² to 70 N/mm ² .

In the case where the solution film forming method is continuously performed for a long period of time using the belt 91 having the welded portion 91w, a scraping powder failure or a thickness deviation failure caused by the welded portion 91w occurs. When the solution film forming method is continuously performed for a long period of time, the welded portion 91w protrudes from the back surface 91b.

Here, it is presumed that when the solution film forming method is continuously performed for a long period of time, the reason why the welded portion 91w protrudes from the back surface 91b is the phase transformation caused by the residual stress of the welded portion 91w.

When the belt 91 is moved in a state where the welded portion 91w protrudes from the back surface 91b, the welded portion 91w comes into contact with the outer peripheral portion of the drum main body 124b and the drum main body 125b. When the contact is repeatedly performed on the back surface 91b, the welded portion 91w in the casting surface 91a is deformed into a concave shape as time passes. When the solution film forming method is carried out in this state, in the film 116, the trace of the welded portion 91w remains as a thickness variation. When the film 116 having the thickness deviation is directly wound up on the winding core 119b, the traces of the welded portion 91w overlap, thereby becoming black bands and appearing in the film roll (hereinafter referred to as black belt failure). In addition, when the solution film forming method is performed in a state where the welded portion 91w protrudes from the back surface 91b, the scraping powder 91f causes a scraping powder failure due to friction between the welded portion 91w and the outer peripheral portion of the drum main body 125b.

In the present invention, the grooved groove 124bd is provided on the belt supporting surface 124bs of the drum body 124b, and the belt 91 is wound around the drum body 124b so that the welded portion 91w is positioned on the concave groove 124bd, so that the welded portion 91w is not in contact with the drum body 124b. Similarly, the belt 91 is wound around the drum main body 125b so that the welded portion 91w is positioned on the concave groove 125bd, so that the welded portion 91w is not in contact with the drum main body 125b. Therefore, the thickness deviation failure and the scraping powder failure can be suppressed.

Further, since it is in contact with each dry wind, the temperature of the belt 91 after the film drying step is higher than before the introduction into the film drying step. If the belt 91 in a high temperature state is used for the film formation step, foaming of the coating may be caused. According to the drum temperature adjusting portion 128da, the drum main body 124b can be cooled such that the temperature of the belt 91 is lower than the foaming temperature of the coating material. Moreover, by the cooling of the drum body 124b, the temperature of the portion of the belt 91 that is in direct contact with the drum body 124b can be made lower than the foaming temperature of the paint.

However, the portion of the belt 91 that does not directly contact the drum body 124b, that is, the portion that faces the concave groove 124bd, is not sufficiently cooled. Moreover, if the cooling is insufficient, foaming of the coating is caused.

As shown in Fig. 14, the belt surface cooler 161 can use the cooling nozzle 161n to spray the cooling gas 161a to the portion facing the concave groove 124bd, so that the cooling of the drum body 124b by the drum temperature adjusting portion 128da can be compensated for. . Therefore, the foaming of the coating material can be more reliably suppressed, and the film 116 can be efficiently produced.

Further, from the viewpoint of production efficiency, it is preferable that the timing of performing the peeling step is such that the content of the solvent of the cast film is high. However, if you want to solvent When the cast film having a high content rate is subjected to the peeling step, residual trouble is likely to occur. Therefore, it is preferred to cool the cast film just before the peeling step. By cooling the drum body 124b using the drum temperature adjusting portion 128da, the casting film can be cooled immediately before the peeling step. By the cooling of the drum body 124b, the temperature of the portion of the belt 91 that is in direct contact with the drum body 124b can be made lower than the foaming temperature of the paint.

However, the portion of the belt 91 that does not directly contact the drum body 124b, that is, the portion that faces the concave groove 124bd, is not sufficiently cooled. Moreover, if the cooling is insufficient, a peeling residual failure may occur.

As shown in Fig. 16, the belt back cooler 162 can use the cooling nozzle 162n to spray the cooling gas 162a to the portion facing the concave groove 124bd, so that the cooling of the drum body 124b by the drum temperature adjusting portion 128da can be compensated for. . Therefore, the peeling residual failure can be suppressed more reliably, and the film 116 can be efficiently manufactured.

Further, the set position of the belt surface cooler 161 in the Z1 direction may be between the peeling position PP and the reaching position CP, and may be any of the peeling chamber 121c and the casting chamber 121a. Here, the arrival position CP is a portion set in the belt 91 supported by the casting metal drum, that is, the horizontal drum 124 (see FIGS. 11 and 15). In this manner, the step of cooling the belt 91 using the belt surface cooler 161 may be performed between the peeling step and the film forming step thereafter.

In the above embodiment, the belt 91 made of stainless steel is used, and the belt 91 made of metal other than stainless steel may be used. Similarly, the stainless steel horizontal drum 124 and the horizontal drum 125 may be made of metal other than stainless steel. Horizontal drum 124, horizontal drum 125.

Instead of using the belt surface cooler 161 to apply the cooling gas 161a to the welded portion 91w on the casting surface 91a side, the solvent may be applied to the welded portion 91w on the casting surface 91a side to evaporate the applied solvent, or may be used. The cooled drum is rotated in a state of being in contact with the welded portion 91w on the side of the casting surface 91a. Similarly, instead of using the back surface cooler 162, the cooling gas 162a may be sprayed on the welded portion 91w on the back surface 91b side, and the solvent may be applied to the welded portion 91w on the back surface 91b side to evaporate the applied solvent, or may be used. The cooled drum is rotated in a state of being in contact with the welded portion 91w on the side of the back surface 91b. In the case where the belt 91 is cooled using a belt surface cooler or a belt back cooler, the solvent contained in the coating material may be applied to the belt 91.

The installation position of the casting die 142 is set to be above the horizontal drum 124, but the present invention is not limited thereto. When the sealing member 131 to the sealing member 132 are provided so as to be close to the portion of the belt 91 wound around the horizontal drum 125, the installation position of the casting die 142 may be set to be above the horizontal drum 125. In this case, the horizontal drum 125 serves as a metal drum for casting, and the horizontal drum 124 serves as a metal drum for peeling.

Further, when the support drum of the support belt 91 is disposed between the horizontal drum 124 and the horizontal drum 125, and the sealing member 131 to the sealing member 132 are disposed in proximity to the portion of the belt 91 supported by the support drum, It is also possible to set the installation position of the casting die 142 to the upper side of the support drum. In this case, the support drum becomes a metal drum for casting, and the horizontal drum 124 serves as a metal drum for peeling.

The film 116 obtained by the present invention can be especially used for a retardation film or a polarizing plate protective film.

The width of the film 116 is preferably 600 mm or more, and more preferably 1400 mm or more and 2500 mm or less. Further, the present invention is also effective in the case where the width of the film 116 is larger than 2500 mm. Further, the film thickness of the film 116 is preferably 20 μm or more and 80 μm or less.

Further, the in-plane retardation Re of the film 116 is preferably 20 nm or more and 300 nm or less, and the thickness direction retardation Rth of the film 116 is preferably -100 nm or more and 300 nm or less.

The method of measuring the in-plane retardation Re is as follows. The in-plane retardation Re is the following retardation value: the sample film is conditioned for 2 hours in an environment of a temperature of 25 ° C and a humidity of 60% RH, using an automatic birefringence meter (KOBRA21DH, prince measurement (strand)) at 632.8 nm. The resulting retardation value was measured from the vertical direction. Further, Re is represented by the following formula.

Re=| n1-n2 |×d

N1 represents the refractive index of the slow axis, n2 represents the refractive index of the fast axis, and d represents the thickness (film thickness) of the film.

The method of measuring the thickness direction retardation Rth is as follows. The sample film was conditioned for 2 hours in an environment of a temperature of 25 ° C and a humidity of 60% RH, and was measured from the vertical direction at 632.8 nm using an ellipsometer (M150, manufactured by JASCO Corporation), based on the measured value, and The extrapolated value of the retardation value which is inclined with respect to the film surface and measured in the same manner is calculated according to the following formula.

Rth={(n1+n2)/2-n3}×d

N3 represents the refractive index in the thickness direction.

(polymer)

In the above embodiment, the polymer to be a raw material of the polymer film is not particularly limited, and examples thereof include deuterated cellulose and cyclic polyolefin.

(deuterated cellulose)

The mercapto group used in the deuterated cellulose of the present invention may be only one type, or two or more kinds of mercapto groups may be used. When two or more fluorenyl groups are used, it is preferred that one of them is an ethyl group. It is preferable that the ratio of the esterification of the hydroxy group of the cellulose by the carboxylic acid, that is, the degree of substitution of the thiol group, satisfies all of the following formulas (I) to (III). Further, in the following formulae (I) to (III), A and B represent the degree of substitution of a thiol group, A represents a degree of substitution of an oxime group, and B represents a degree of substitution of a fluorenyl group having 3 to 22 carbon atoms. . Further, it is preferred that 90% by mass or more of triacetyl cellulose (TAC) is 0.1 mm to 4 mm.

(I) 2.0≦A+B≦3.0

(II) 1.0≦A≦3.0

(III)0≦B≦2.0

The total substitution degree A+B of the fluorenyl group is more preferably 2.20 or more and 2.90 or less, and particularly preferably 2.40 or more and 2.88 or less. Further, the degree of substitution B of the fluorenyl group having 3 to 22 carbon atoms is more preferably 0.30 or more, and particularly preferably 0.5 or more.

The cellulose as a raw material of deuterated cellulose can be obtained from one of linter and pulp.

The mercapto group having a carbon number of 2 or more in the deuterated cellulose of the present invention may be an aliphatic group or an aryl group, and is not particularly limited. These deuterated celluloses are, for example, alkylcarbonyl esters, alkenylcarbonyl esters, aromatic carbonyl esters, aromatic alkylcarbonyl esters and the like of cellulose, and may each have a further substituted group. Preferable examples of the mercapto group include a fluorenyl group, a butyl group, a decyl group, a decyl group, a decyl group, a decyl group, a dodecyl group, a tridecyl fluorenyl group, a tetradecyl fluorenyl group, and a hexadecane group. An alkanoyl group, an octadecyl fluorenyl group, an isobutyl fluorenyl group, a tert-butyl fluorenyl group, a cyclohexanecarbonyl group, an oil fluorenyl group, a benzamyl group, a naphthylcarbonyl group, a cinnamyl group, and the like. Among these, a propyl fluorenyl group, a butyl fluorenyl group, a dodecyl fluorenyl group, an octadecyl fluorenyl group, a tert-butyl fluorenyl group, an oil fluorenyl group, a benzamyl group, a naphthylcarbonyl group, a cinnamyl group, etc. are more preferable, and a propylene group is especially preferable. Ding Yuji.

(solvent)

Examples of the solvent for preparing the coating material include aromatic hydrocarbons (for example, benzene, toluene, etc.), halogenated hydrocarbons (for example, dichloromethane, chlorobenzene, etc.), and alcohols (for example, methanol, ethanol, n-propanol, n-butanol, and diethylene glycol). An alcohol or the like), a ketone (e.g., ethyl ketone or methyl ethyl ketone), an ester (e.g., methyl acetate, ethyl acetate, propyl acetate, etc.) and an ether (e.g., tetrahydrofuran, methyl cellosolve, etc.). Further, in the present invention, the coating material refers to a polymer solution or a dispersion obtained by dissolving or dispersing a polymer in a solvent.

Among these, a halogenated hydrocarbon having 1 to 7 carbon atoms is preferably used, and dichloromethane is most preferably used. From the viewpoints of physical properties such as solubility of a polymer, peeling property of a cast film from a support, mechanical strength of a film, and optical properties of a film, it is preferred to mix one or several carbons other than methylene chloride. An alcohol having 1 to 5 atoms. The content of the alcohol is preferably 2% by mass to 25% by mass, and more preferably 5% by mass to 20% by mass based on the total amount of the solvent. Specific examples of the alcohol include methanol, ethanol, n-propanol, isopropanol, n-butanol, etc., and methanol, ethanol, n-butanol or a mixture thereof is preferably used.

However, recently, in order to minimize the influence on the environment, the solvent composition when dichloromethane is not used has been studied. For this purpose, it is preferred to use an ether having 4 to 12 carbon atoms and 3 carbon atoms. A ketone of ~12, an ester having 3 to 12 carbon atoms, and an alcohol having 1 to 12 carbon atoms. Sometimes they are mixed appropriately. For example, a mixed solvent of methyl acetate, ethyl ketone, ethanol, and n-butanol can be mentioned. These ethers, ketones, esters and alcohols may also have a cyclic structure. Further, any two or more of the functional groups having an ether, a ketone, an ester, and an alcohol (i.e., -O-, -CO-, -COO-, and -OH) may also be used as a solvent.

Further, the details of the deuterated cellulose are described in paragraphs [0140] to [0195] of JP-A-2005-104148. These descriptions can also be applied to the present invention. In addition, additives such as solvents, plasticizers, anti-deterioration agents, ultraviolet absorbers (UV agents), optical anisotropy control agents, retardation control agents, dyes, matting agents, release agents, and release accelerators are also detailed. It is described in paragraph [0196] to paragraph [0516] of Japanese Patent Laid-Open No. 2005-104148.

In the above embodiment, the solution film forming method has been described. However, the present invention is also applicable to a method of applying (casting) a liquid onto a support to form a coating film.

[Example]

Hereinafter, in order to confirm the effect of the present invention, Experiments 1 to 4 were carried out. The details of each experiment are explained in Experiment 1, and for Experiments 2 to 4, only conditions different from Experiment 1 are shown.

(Experiment 1)

The belt 91 having a predetermined polishing treatment on the casting surface 91a and the back surface 91b was used, and the solution film forming apparatus 110 (see FIG. 10) was operated for 700 hours in succession to produce the film 116 from the coating material 112. As the casting support unit, a horizontal drum 124, a horizontal drum 125, a belt 91, and a belt movement control unit 128 as shown in Fig. 12 are used. The maximum value CL1 (see FIG. 14) of the interval between the bottom of the concave groove 124bd and the back surface 91b of the belt 91 is 0.1 mm. The temperature of the drum main body 124b was adjusted to 10 ° C by the drum temperature adjusting portion 128da and the drum temperature adjusting portion 128db, and the temperature of the drum main body 125b was adjusted to 30 °C. The moving tension T1 applied to the belt 91 was 60 N/mm ² . Further, the belt temperature adjustment unit 128b is not used.

(Experiment 2)

The film 116 was produced in the same manner as in Experiment 1 except that the CL1 was a value shown in Table 1 and the back surface cooler 162 was used as the temperature adjustment unit 128b. The temperature of the cooling gas 162a was 5 ° C, and the wind speed of the cooling gas 162a was 20 m/s.

[Table 1]

(Experiment 3)

The film 116 was produced in the same manner as in Experiment 1 except that the CL1 was a value shown in Table 1 and the surface cooler 161 was used as the temperature adjustment unit 128b. The temperature of the cooling gas 161a was 5 ° C, and the wind speed of the cooling gas 161a was 20 m/s.

(Experiment 4)

The film 116 was produced in the same manner as in Experiment 1 except that the horizontal drum 124 and the horizontal drum 125 were replaced with a horizontal drum having no concave groove and a flat entire surface.

(Evaluation)

The films obtained in Experiments 1 to 4 were subjected to the following evaluations.

1. Evaluation of scraping powder failure

Study whether there is a scraping powder failure.

A: No scraping powder failure occurred.

B: A scraping powder failure occurred.

2. Evaluation of thickness deviation of traces in the welded portion

In the following order, it was investigated whether or not the trace of the welded portion remained as a thickness deviation. The sample film was cut out from the film before being taken up onto the core by the take-up device 119. The cut sample film was overlapped by 10 pieces. Then, the light is transmitted through 10 overlapping sample films, and at this time, the shadow appearing on the surface of the sample film is visually observed. Shadow. The case where no shadow was observed in the portion formed in the welded portion in the sample film was evaluated as (A), and the case where the shadow was observed in the portion formed in the welded portion in the sample film was evaluated as (B).

The evaluation results of Experiments 1 to 4 are shown in Table 1. Further, in Table 1, the number assigned to the evaluation result indicates the number assigned to the evaluation item.

10‧‧‧With manufacturing equipment

11‧‧‧ side members

11e, 12e‧‧‧ side edge

12‧‧‧Central components

13‧‧‧With components

13c, 91c‧‧‧ Central Department

13s, 91s‧‧‧ side

13w, 91v, 91w‧‧‧ welding department

16‧‧‧Send out

17‧‧‧Docking Department

18, 61‧‧‧ welding unit

19‧‧‧ heating department

20‧‧‧Winding device

23‧‧‧First delivery device

24‧‧‧Second delivery device

26‧‧‧First roller

27‧‧‧second roller

28‧‧‧ Third Roller

29‧‧‧fourth roller

32, 37, 50‧‧‧ mobile agencies

33, 38, 51, 128c‧‧‧ controller

34, 47‧‧‧ Position Detection Department

41‧‧‧Welded support roller

42‧‧‧ welding equipment

43‧‧‧Laser oscillator

46‧‧‧ welding device body

52‧‧‧ chamber

55‧‧‧ cleaning device

56‧‧‧ Pipes

57‧‧‧Air blower

62‧‧‧ Pressing device

63‧‧‧First belt

64‧‧‧Second belt

67‧‧‧ fifth roller

68‧‧‧6th roller

69‧‧‧ seventh roller

71‧‧‧High thermal conductivity

72‧‧‧welds

73‧‧‧ Heat affected zone

76‧‧‧ slots

81‧‧‧Conical roller

82‧‧‧ drive mechanism

85‧‧‧ fixture

86‧‧‧Clamp body

87‧‧‧clamping pin

91‧‧‧With/cast zone

91a‧‧‧Running surface

91b‧‧‧Back

110‧‧‧solution film making equipment

112‧‧‧ paint

113‧‧‧ Wet film

115‧‧‧casting device

116‧‧‧ film

117‧‧‧布铗拉机

118‧‧‧membrane drying device

118a‧‧‧Roller

119‧‧‧Winding device

119a‧‧‧ Pressing roller

119b‧‧‧core

121‧‧‧Shell

121a‧‧‧Casting room

121b‧‧·drying room

121c‧‧‧ peeling room

121co‧‧‧Export

122‧‧‧ peeling roller

124, 125‧‧‧ horizontal drum

124a‧‧‧Drive shaft

124b, 125b‧‧‧drum body

124bb‧‧‧ bottom

124bd, 125bd‧‧‧ concave groove

124bE‧‧‧ end section

124bs, 125bs‧‧‧ with support surface

125a‧‧‧Axis

128‧‧‧Mobile Control Unit

128b‧‧‧With temperature control department

128d, 128da, 128db‧‧‧drum thermostat

1281c‧‧‧ load weight

128m‧‧‧Drive motor

128s‧‧‧Axis movement department

131‧‧‧First sealing member

132‧‧‧Second sealing member

133‧‧‧ Third sealing member

141‧‧‧cast film

142‧‧‧casting mould

142a‧‧‧ Paint outlet

143‧‧‧Relief machine

143a‧‧‧Decompression chamber

151‧‧‧First dryer

151a‧‧‧First gas supply pipeline

151b‧‧‧First exhaust duct

151da‧‧‧The first dry wind

153‧‧‧Second dryer

153a‧‧‧Second exhaust duct

153b‧‧‧Second gas supply pipeline

153da‧‧‧Second dry wind

161‧‧‧with surface cooler

161a, 162a‧‧‧ cooling gas

161n, 162n‧‧‧ cooling nozzle

161s, 162s‧‧‧Cooling nozzle position adjustment

161t, 162t‧‧‧ tempering department

162‧‧‧With back cooler

171‧‧‧Support roller

172‧‧‧ trimming device

173‧‧‧Cooling room

174‧‧‧Knurling roller

A, Z1, Z2, Z3‧‧‧ direction

CL1, D1‧‧‧ interval

CP‧‧‧ arrival location

D2, D3‧‧‧ distance

D4, D5‧‧‧ width

D6, D _124bd ‧‧‧ Depth

Ph‧‧‧ docking position

PP‧‧‧ peeling position

Ps‧‧‧Contact location

Pw‧‧‧ welding position

W _{124bd ‧‧‧Width}

Y‧‧‧Width direction

Θ1, θ2‧‧‧ corner

Fig. 1 is a side view showing an outline of a manufacturing apparatus of a belt.

Fig. 2 is a plan view showing an outline of a belt manufacturing apparatus.

Fig. 3 is a side view showing an outline of a welding unit.

4 is a plan view showing an outline of a welding unit.

Fig. 5 is a cross-sectional view taken along line V-V of the outline of the welding support roller.

Fig. 6 is an explanatory view of a weld bead and its periphery.

Fig. 7 is a schematic view of a tapered drum.

Fig. 8 is a schematic view of a jig.

Fig. 9 is a schematic view of a belt.

Fig. 10 is a side view showing an outline of a solution film forming apparatus.

Fig. 11 is a side view showing an outline of a casting device.

Fig. 12 is a perspective view showing an outline of a main body of a casting apparatus.

Fig. 13 is a perspective view showing an outline of a horizontal drum.

Figure 14 is a cross-sectional view of the belt P1-P1 line.

Fig. 15 is a perspective view showing an outline of a belt back cooler.

Figure 16 is a cross-sectional view of the belt P2-P2 line.

91‧‧‧With/cast zone

91w‧‧‧Weld Department

122‧‧‧ peeling roller

124, 125‧‧‧ horizontal drum

124a‧‧‧Drive shaft

124b, 125b‧‧‧drum body

125a‧‧‧Axis

128‧‧‧Mobile Control Unit

128b‧‧‧With temperature control department

128c‧‧‧ Controller

128d, 128da, 128db‧‧‧drum thermostat

1281c‧‧‧ load weight

128m‧‧‧Drive motor

128s‧‧‧Axis movement department

142‧‧‧casting mould

143‧‧‧Relief machine

151‧‧‧First dryer

151a‧‧‧First gas supply pipeline

151b‧‧‧First exhaust duct

151da‧‧‧The first dry wind

161‧‧‧with surface cooler

162‧‧‧With back cooler

Z1, Z2, Z3‧‧‧ direction

Claims (9)

A metal drum characterized by being rotatably supported; supporting a metal seamless belt with a circumferential surface, the metal seamless belt having a welded portion extending in the longitudinal direction, and in the circumference The surface has a groove extending in the circumferential direction in the positional region of the welded portion. The metal drum of claim 1, wherein the groove is annular. The metal drum of claim 1 or 2, wherein the bottom of the groove has a flat surface. A casting device, comprising: a pair of metal drums according to any one of claims 1 to 3; the seamless belt, wherein the welded portion is located in the groove The upper method is wound around the pair of metal drums, and is moved in the longitudinal direction by the rotation of the metal drum; the casting mold is flowed, and the polymer and the solvent are discharged to the surface of the seamless belt. And a film dryer that applies hot air to the casting film containing the effluent coating and formed on the surface to evaporate the solvent from the casting film. A casting apparatus according to claim 4, which comprises a peeling machine which peels the cast film from the seamless tape to obtain a wet film. The casting device according to claim 5, wherein: in the pair of metal drums, the metal drum facing the stripping machine is a metal drum for peeling, and the casting film is a portion of the jointless belt supported by the peeling metal drum is peeled off; and the casting device includes: a peeling drum cooler to cool the peeling metal drum; and a back cooler The welded portion of the seamless belt that moves in the direction of the metal drum for peeling is cooled from the back side. The casting device according to Item 5 or 6, wherein in the pair of metal drums, the metal drum facing the casting mold is a metal drum for casting, The coating flowing out of the casting die reaches a portion of the seamless belt supported by the casting metal drum; and the casting device comprises: a casting drum cooler, The casting is cooled by a metal drum; and a surface cooler is disposed between the position where the coating material arrives in the jointless belt and the position where the casting film is peeled off, and the seamless belt faces Provided, and the welded portion supported by the casting metal drum is cooled from the surface side. A method of forming a cast film, characterized in that the casting film is formed on a surface of the seamless tape by using a casting device as described in claim 4 of the patent application. A method of forming a film, characterized in that the casting film is formed on the surface of the seamless tape by using a casting device according to any one of claims 5 to 7. The cast film is peeled off from the seamless tape, thereby producing a film.