KR101943656B1 - Apparatus for controlling moving direction of annular band, method for controlling moving direction of annular band, casting facility, and solution film forming method - Google Patents

Abstract

The annular flexible band 26 is wound on the horizontal rollers 24 and 25 in a tensioned state. The horizontal roller 24 is rotated by the motor 24M. The flexible band 26 circularly moves the traveling path formed around the horizontal rollers 24 and 25. Between the horizontal roller 24 and the horizontal roller 25 there are disposed a band one end temperature control unit 61P for cooling one end of the flexible band 26 in the Y direction and a band one end temperature control unit 61P for cooling the other end of the flexible band 26 in the Y direction And the other-end temperature control unit 61Q is provided. The control unit detects the direction in which the flexible band 26 deviates from the traveling path by the deviation direction determination section. Further, the control unit preferentially cools the end of the flexible band 26 in the direction away from the traveling path over the end of the flexible band 26 in the direction opposite to the off-direction.

Description

TECHNICAL FIELD [0001] The present invention relates to an annular band moving direction control apparatus, an annular band moving direction control method, a flexible facility, and a solution film forming method. BACKGROUND OF THE INVENTION 1. Field of the Invention }

The present invention relates to an apparatus for controlling the moving direction of an annular band, a method for controlling the moving direction of an annular band, a flexible apparatus, and a solution film forming method.

A thermoplastic film having light transmittance (hereinafter referred to as a film) is lightweight and easy to mold, and thus is used in many fields as an optical film. Among them, a cellulose ester film using a cellulose acylate or the like is used as an optical film of a liquid crystal display device in addition to a photographic light-sensitive film. Examples of the optical film of the liquid crystal display device include a polarizing plate protective film and a retardation film.

The film is produced by a solution casting method. The solution film-forming method is as follows. A polymer solution containing a polymer and a solvent (hereinafter referred to as " dope ") is caused to flow toward a moving support on which a temperature is adjusted, thereby forming a strip-shaped flexible film on the support. The dope flows on the support using a flexible die disposed in the flexible chamber. Next, the solvent is evaporated from the flexible film until the flexible film can be transported (hereinafter referred to as film drying process). Thereafter, the transportable flexible film is peeled from the support to form a wet film (hereinafter referred to as a peeling process). Then, the solvent is evaporated from the wet film to form a film (hereinafter referred to as film drying process).

As a support used in this solution casting method, an annular band which circulates through a plurality of rollers is known. By using this annular band, the film forming process, the film drying process, and the peeling process can be repeatedly performed. As a result, the production efficiency of the film can be improved.

However, when the solution film-forming method is performed for a long time, the annular band may deviate from the predetermined traveling path. If the solution film-forming method is performed while the annular band is out of the traveling path, the uniformity of the obtained film is impaired. In particular, the thickness, surface condition and uniformity of the optical characteristics in the width direction are impaired.

As a method for adjusting the moving direction of the annular band, for example, a method of shifting either one of the driving roller and the driven roller in which the annular band is wound, described in JP-A-2008-195463, It is known.

However, the annular band used in the solution film-forming method is longer than that used as a conveying device for articles. In order to control the traveling path of such a long annular band, when using the method described in Japanese Patent Laid-Open No. 2008-195463, high precision is required to control the variation of the roller. As a result, it is difficult to control the moving direction of the annular band.

The annular band used in the solution film-forming method is made of stainless steel. In this case, as in the invention disclosed in Japanese Unexamined Patent Application Publication No. 2008-195463, friction is generated between the roller and the annular band when an attempt is made to change the roller in which the annular band is wound in a certain direction. The portion where the friction is generated appears as a defect on the surface side of the annular band, that is, on the band surface on which the flexible film is formed, through corrosion due to peeling of the plating layer and phase transformation due to stress caused by friction. When a flexible film is formed on the band surface having such defects, a trace of defects remains on the surface of the film.

The present invention relates to an apparatus for controlling the moving direction of an annular band which facilitates control of the moving direction of the annular band and suppresses friction between the roller and the annular band, a method for controlling the moving direction of the annular band, And a method thereof.

The annular band in the moving direction control device of the annular band of the present invention is made of stainless steel. The annular band is wound on a driving roller and a driven roller disposed in parallel, and moves in the longitudinal direction by rotation of the driving roller. The annular band moves on a predetermined traveling path in the width direction. An apparatus for controlling the moving direction of an annular band of the present invention includes a band tension adjusting unit, a band tension adjusting unit, and a band tension controlling unit. Once the band tension adjuster adjusts the tension at one end in the width direction of the annular band. The other-end band tension adjusting portion adjusts the tension at the other end in the width direction of the annular band. The band tension control unit controls the band tension adjusting unit or the band tension adjusting unit at the other end. The band tension control section performs control when one of the end portions in the width direction of the annular band deviates from the traveling path. The band tension control section performs control so that the tension at the end in the direction deviated from the traveling path of the annular band is larger than the tension at the end opposite to the direction in which the annular band moves.

It is preferable that the apparatus for controlling the moving direction of the annular band further includes a band one end warming portion, another end band tempering portion, and a band temperature control portion. The band once the tuning part adjusts the temperature on one side in the width direction among the annular bands. Once the band is temporarily attached to the band tension adjuster. The other-end tem- perature section of the band adjusts the temperature of the other end side in the width direction of the annular band. The other-end band tempering section is provided in the other-end band tension adjusting section. The band-tem- perature control unit controls the band-end tempering unit and the band other-end tempering unit. The band temperature control section performs control so as to preferentially cool the end portion of the annular band deviated from the traveling path over the end portion on the side opposite to the off-axis direction.

It is preferable that the heating section feeds the heating gas to one widthwise end side of the annular band and the other end temperature heating section supplies the heating gas to the other end side in the width direction of the annular band.

It is preferable that the heating section of the band has a band spreader and a band evaporator once, and the other end band tempering section has a band spreader and another band evaporator. The band applicator once applies one liquid to one end side in the width direction of the annular band. The band evaporator once evaporates one liquid applied to one end side in the width direction of the annular band. The other-end band applicator applies another liquid to the other end side in the width direction of the annular band. The other-end evaporator evaporates the other liquid applied to the other end side in the width direction of the annular band.

The apparatus for controlling the moving direction of the annular band preferably includes a roller one end warming portion, another roller one end warming portion, and a roller temperature control portion. The roller temporarily controls the temperature at one end in the width direction of either the drive roller or the driven roller. The rollers are temporarily provided with a temperature control unit. The temperature of the other end of the roller in the width direction of the driving roller and the driven roller is adjusted. The other-end band tension adjusting portion is provided at the other end of the rollers. The roller temperature control section controls the roller one end warming section or the roller one end temperature increasing section. The band tension control section performs control so as to preferentially cool the end portion of the annular band in the direction away from the end portion on the opposite side of the annular band.

It is preferable that the heating section feeds the heating gas to one end in the width direction of the roller, and the heating section in the other end feeds the heating gas to the other end in the width direction of the roller.

It is preferable that the roller has a flow path and an end flow path once. Once the flow path is built into one side in the width direction, the one side temperature control medium is circulated. The other-end flow path is built in the other end side in the width direction, and the other-side temperature control medium is flown. One end of the roller feeds the medium for temperature control at the one end to the flow path. The other-end temperature control section supplies the other-end temperature control medium to the other-end flow path.

It is preferable that the roller has one roller applicator and one roller evaporator, and the other roller temperature section has the other roller applicator and the other roller evaporator. The roller applicator once applies one liquid to one end side in the width direction of the roller. The roller evaporator once evaporates one liquid applied to one end side in the width direction of the roller. The other-end roller applicator applies another liquid to the other end side in the width direction of the roller. The other roller evaporator evaporates the other liquid applied to the other end side in the width direction of the roller.

And a departure direction determination section for determining whether or not the annular band is deviated in the direction of the one end side and the other end side in the width direction.

The flexible equipment of the present invention comprises a flexible die, an annular band made of stainless steel, a solvent evaporation device, a peeling device, and an annular band movement control device. The flexible die drains the dope including polymer and solvent. The annular band has a supporting surface for supporting the drained dope. The annular band forms a membrane made of dope on the supporting surface. The annular band is wound on a driving roller and a driven roller disposed in parallel, and moves in the longitudinal direction by rotation of the driving roller. The annular band moves on a predetermined traveling path in the width direction. The solvent evaporator evaporates the solvent from the film. The peeling apparatus peels the film from the annular band. The movement control device of the annular band has a band tension adjusting part, a band end tension adjusting part, and a band tension controlling part. Once the band tension adjuster adjusts the tension at one end in the width direction of the annular band. The other-end band tension adjusting portion adjusts the tension at the other end in the width direction of the annular band. The band tension control unit controls the band tension adjusting unit or the band tension adjusting unit at the other end. The band tension control section performs control when one of the end portions in the width direction of the annular band deviates from the traveling path. The band tension control section performs control so that the tension at the end in the direction deviated from the traveling path of the annular band is larger than the tension at the end opposite to the direction in which the annular band moves.

It is preferable that the flexible equipment further comprises a band-stop warming portion, a band-other-end warming portion, and a band-tone control portion. The band once the tuning part adjusts the temperature on one side in the width direction among the annular bands. Once the band is temporarily attached to the band tension adjuster. The other-end tem- perature section of the band adjusts the temperature of the other end side in the width direction of the annular band. The other-end band tempering section is provided in the other-end band tension adjusting section. The band-tem- perature control unit controls the band-end tempering unit and the band other-end tempering unit. The band temperature control section performs control so as to preferentially cool the end portion of the annular band deviated from the traveling path over the end portion on the side opposite to the off-axis direction.

It is preferable that the flexible facility includes a roller one end warming portion, another roller end warming portion, and a roller temperature control portion. The roller temporarily controls the temperature at one end in the width direction of either the drive roller or the driven roller. The rollers are temporarily provided with a temperature control unit. The other-end temperature control section adjusts the temperature at the other end in the width direction of the drive roller or the driven roller. The other-end band tension adjusting portion is provided at the other end of the rollers. The roller temperature control section controls the roller one end warming section or the roller one end temperature increasing section. The band tension control section performs control so as to preferentially cool the end portion of the annular band in the direction away from the end portion on the opposite side of the annular band.

It is preferable that the flexible equipment is provided with both end cooling devices for cooling both end portions in the width direction of the annular band.

It is preferable that the both-end cooling device cool the portion of the annular band remote from the roller.

In the method of controlling the moving direction of the annular band of the present invention, the annular band is made of stainless steel. The annular band is wound on a driving roller and a driven roller disposed in parallel, and moves in the longitudinal direction by rotation of the driving roller. The annular band moves on a predetermined traveling path in the width direction. A method of controlling the moving direction of an annular band of the present invention includes a direction specifying step and a band tension balance step. The direction specifying step specifies the direction in which the annular band deviates from the traveling path. The band tension balancing step controls the band tension adjusting part and the other end band tension adjusting part once. The control is carried out such that the tension at the end in the direction away from the traveling path in the annular band is greater than the tension at the end opposite to the direction in which it is off. Once the band tension adjuster adjusts the tension on one side in the width direction of the annular band. The other-end band tension adjusting portion adjusts the tension on the other end side in the width direction of the annular band.

It is preferable that the method for controlling the moving direction of the annular band has a deviation direction determination step. The deviation direction determination step determines whether or not the annular band is deviated in the direction of one end side and the other end side in the width direction.

The solution film-forming method of the present invention is characterized in that the solution film-forming method of the present invention is a solution casting method comprising a film forming step (step A), a film drying step (step B), a peeling step (step C) ). Step A forms a film composed of dopes on the band surface of the annular band by draining the dope toward the annular band. The dope includes a polymer and a solvent. The annular band is made of stainless steel. The annular band is wound on a driving roller and a driven roller disposed in parallel, and moves in the longitudinal direction by rotation of the driving roller. The annular band moves on a predetermined traveling path in the width direction. In step B, the film on the band surface is blown to evaporate the solvent from the film. In the C step, the film that has undergone the B step is peeled from the annular band. The D step specifies the direction in which the annular band deviates from the traveling path. The E step controls the band tension adjusting part and the other end band tension adjusting part once. The control is carried out such that the tension at the end in the direction away from the traveling path in the annular band is greater than the tension at the end opposite to the direction in which it is off. Once the band tension adjuster adjusts the tension on one side in the width direction of the annular band. The other-end band tension adjusting portion adjusts the tension on the other end side in the width direction of the annular band.

The solution film-forming method preferably includes both end cooling steps for cooling both end portions in the width direction of the annular band. The both-end cooling step is performed in parallel with the B step.

It is preferable to start the both-end cooling step and the B step at the same time.

According to the present invention, it is possible to easily control the moving direction of the annular band. Further, according to the present invention, friction between the roller and the annular band can be suppressed.

The above objects and advantages will be readily apparent to those skilled in the art from a reading of the detailed description of the preferred embodiments with reference to the accompanying drawings.
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an explanatory view showing an outline of a solution film-forming apparatus. FIG.
Fig. 2 is a side view showing an outline of a flexible apparatus. Fig.
Fig. 3 is a perspective view showing an outline of each component disposed in the casing of the flexible apparatus. Fig.
4 is a perspective view showing an outline of a first one-end band tension adjusting unit and a first other-end band tension adjusting unit.
Fig. 5 is a cross-sectional view showing an outline of the heating gas duct and the other heating gas duct.
6 is a perspective view showing an outline of a film formation area cooler.
Fig. 7 is an explanatory diagram showing an outline of the one-step deviation detection part and the second-step deviation detection part.
8 is a block diagram showing an outline of a first one-end band tension adjusting unit, a first other-end band tension adjusting unit, an offset detecting unit and a control unit.
9 is a cross-sectional view showing the outline of a flexible film formed by a film formation process.
10 is a cross-sectional view schematically showing a flexible film having a dry layer and a wet layer.
11 is a plan view showing an outline of a flexible band in a state deviating from a traveling path.
Fig. 12 is a cross-sectional view showing an overview of a heating gas duct and a heating gas duct at the other end.
13 is a perspective view showing an outline of a second one-end band tension adjusting unit and a second other-end band tension adjusting unit.
14 is a block diagram showing an outline of a second one-end band tension adjusting section, a second other-end band tension adjusting section, a deviation detecting section and a control unit.
15 is a perspective view showing an outline of a third one-end band tension adjusting unit and a third other-end band tension adjusting unit.
16 is a block diagram showing an outline of a third one-end band tension adjusting unit, a third other-end band tension adjusting unit, an offset detecting unit and a control unit.
17 is a perspective view showing an outline of a fourth one-end band tension adjusting unit and a fourth other-end band tension adjusting unit.
18 is a block diagram showing an outline of a fourth one-end band tension adjusting unit, a fourth other-end band tension adjusting unit, a deviation detecting unit, and a control unit.
19 is a perspective view showing an outline of a fifth one-end band tension adjusting unit and a fifth other-end band tension adjusting unit.
20 is a perspective view showing an outline of a fifth one-end band tension adjuster and a fifth other-end band tension adjuster.
21 is a block diagram showing an outline of a fifth one-end band tension adjusting unit, a fifth other-end band tension adjusting unit, an offset detecting unit and a control unit.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

 (Solution deposition equipment)

1, the solution film-forming equipment 10 has a flexible device 15, a clip tenter 17, a drying device 18, and a winding device 19. As shown in Fig. The flexible device 15 makes the wet film 13 from the dope 12. [ The clip tenter 17 obtains the film 16 by drying the wet film 13. The drying device 18 dries the wet film 13. The winding device 19 winds the film 16 on the winding core.

 (Flexible device)

As shown in Figs. 1 and 2, the flexible device 15 has a casing 23 and horizontal rollers 24, 25 arranged horizontally in parallel in the casing 23. The horizontal roller 24 has a drive shaft 24A and a roll body 24B made of stainless steel fixed to the drive shaft 24A. The horizontal roller 25 has a shaft 25A and a roll body 25B made of stainless steel fixed to the shaft 25A. An annular flexible band 26 is wound around the horizontal rollers 24 and 25. The flexible band 26 is obtained by connecting both ends of the strip-shaped sheet material.

Here, the horizontal means that the angle of intersection of the horizontal rollers 24 and 25 with respect to the horizontal plane is 0 DEG or more and 0.01 DEG or less. In addition, parallel means that the angle of intersection of the horizontal rollers 24 and 25 is 0 DEG or more and 0.01 DEG or less.

The drive shaft 24A is connected to the roller driving motor 24M (see Fig. 3). The motor control unit (not shown) controls the roller driving motor 24M and rotates the horizontal roller 24 at a predetermined speed. The flexible band 26 is circularly moved in a predetermined direction in accordance with the rotation of the horizontal roller 24 and the horizontal roller 25 is rotated in accordance with the movement of the flexible band 26. Hereinafter, the moving direction of the flexible band 26 is referred to as the X direction, the width direction of the flexible band 26 is referred to as the Y direction, and the vertical direction is referred to as the Z direction.

In addition, the drive shaft 24A is movable between a tension application position and a relaxation position. The tension application position is a position where a predetermined tension is applied to the flexible band 26 spanning the roller bodies 24B and 25B. The relaxed position is a position where the flexible band 26 spanning the roller bodies 24B and 25B is loosened. The shaft shift portion 24AS is capable of changing the drive shaft 24A between a tension application position and a relaxation position under the control of a control unit (not shown). It is preferable that the shaft shift portion 24AS be shifted while maintaining a state parallel to the shaft 25A. A load cell 24AL is mounted on the drive shaft 24A. The load cell 24AL detects an external force received by the drive shaft 24A. A control unit (not shown) reads an external force received by the drive shaft 24A from the load cell 24AL. Next, based on the read out external force and the value of the cross-sectional area of the built-in flexible band 26, the control unit (not shown) controls the shaft shift portion 24AS so that the tension applied to the flexible band 26 becomes a predetermined value. . Thus, the tension can be uniformly applied to the flexible band 26 in the Y direction.

The moving speed V _26A of the surface of the flexible band 26 (hereinafter referred to as flexible surface) 26A (see FIG. 3) is preferably not more than 200 m / min. When the moving speed V _26A exceeds 200 m / min, it becomes difficult to stably form the beads. The lower limit of the moving speed V _26A may be obtained by considering the productivity of the target film. The lower limit of the moving speed V _26A is, for example, 10 m / min or more.

The flexible band 26 is preferably made of stainless steel and more preferably made of SUS316 having sufficient corrosion resistance and strength. The width of the flexible band 26 is preferably 1.1 times or more and 2.0 times or less the width of the dope 12, for example. The length of the flexible band 26 is preferably 20 m or more and 200 m or less, for example. The thickness of the flexible band 26 is preferably 0.5 mm or more to 2.5 mm or less, for example. The thickness variation of the flexible band 26 is preferably 0.5% or less with respect to the total thickness. It is preferable that the flexible surface 26A is polished, and the surface roughness of the flexible surface 26A is preferably 0.05 m or less.

As shown in Fig. 2, the first to third seal members 31 to 33 are sequentially arranged in the casing 23 from the upstream side in the X direction toward the downstream side. The first to third seal members 31 to 33 are provided so as to protrude from the inner wall surface of the casing 23 so that the protruding end is close to the flexible surface 26A of the flexible band 26. [ The casing 23 is divided into the flexible chamber 23A, the drying chamber 23B and the peeling chamber 23C from the upstream side in the X direction toward the downstream side by the first to third seal members 31 to 33 Loses. The airtightness of the flexible chamber 23A is maintained by the first to second seal members 31 to 32. [ The airtightness of the drying chamber 23B is held by the second to third seal members 32 to 33. [ The interval between the first to third seal members 31 to 33 and the flexible surface 26A is, for example, 1.5 mm or more and 2.0 mm or less.

 (Flexible room)

In the flexible chamber 23A, a flexible die 40 and a decompression unit 41 are provided. The flexible die 40 has a dope outlet 40A for draining the dope 12 and is disposed above the horizontal roller 24 so that the dope outlet 40A is close to the flexible band 26. [

The flexible die 40 allows the dope 12 to flow out of the dope outlet 40A toward the flexible band 26. [ The dope 12 from the dope outlet 40A until reaching the flexible surface 26A forms a bead. The dope 12 reaching the flexible surface 26A extends in the X direction and, as a result, forms a band-shaped flexible film 43. [

The decompression unit 41 serves to decompress the upstream side of the bead in the X direction. The decompression unit 41 has a decompression chamber 41A, a decompression fan 41B, and a suction pipe 41C. The decompression chamber 41A is arranged on the upstream side of the dope outlet 40A of the flexible die 40 in the X direction. The decompression fan 41B sucks the gas in the decompression chamber 41A. The suction pipe 41C connects the decompression fan 41B and the decompression chamber 41A.

 (Drying room)

The first drying unit 51 to the second drying unit 52 for supplying predetermined drying air to the flexible film 43 are sequentially installed in the drying chamber 23B from the upstream side toward the downstream side in the X direction. The first drying unit 51 is disposed above the flexible band 26 that extends over the horizontal rollers 24 and 25. The second drying unit 52 is disposed below the flexible band 26 across the horizontal rollers 24 and 25.

As shown in Figs. 3 to 5, the first drying unit 51 includes a first air supply duct 51A and a first air discharge duct 51B. The first air supply duct 51A and the first air exhaust duct 51B are sequentially installed from the upstream side toward the downstream side in the X direction. The first air supply duct 51A and the first air exhaust duct 51B are disposed apart from the flexible band 26, respectively. The first air supply duct 51A is provided with a first air supply mechanism 51AO through which the first drying air 51DA is delivered. The first feeding mechanism 51AO, which opens toward the downstream side in the X direction, is provided extending from one end to the other end of the flexible film 43. The first exhaust duct 51B is provided with a first exhaust port 51BO for exhausting the first drying air 51DA. The first exhaust port 51BO, which opens toward the upstream side in the X direction, is provided extending from one end to the other end of the flexible film 43.

The second drying unit 52 includes a second exhaust duct 52A and a second air supply duct 52B. The second exhaust duct 52A and the second air supply duct 52B are sequentially installed from the upstream side in the X direction toward the downstream side. The second exhaust duct 52A and the second air supply duct 52B are disposed apart from the flexible band 26, respectively. The second exhaust duct 52A is provided with a second exhaust port 52AO for exhausting the second dry air 52DA. The second exhaust port 52AO, which opens toward the downstream side in the X direction, is extended from one end to the other end of the flexible film 43. The second air supply duct 52B is provided with a second air supply mechanism 52BO through which the second drying air 52DA is delivered. The second feeding mechanism 52BO opening toward the upstream side in the X direction is provided extending from one end of the flexible film 43 to the other end.

The first drying unit 51 to the second drying unit 52 are provided with first to second blowing fans (not shown) and first to second warming units (not shown), respectively. The drying control unit (not shown) connects the first to second blowing fans and the first to second on-off valves. The drying control unit independently adjusts the temperature and wind speed for the first drying air 51DA and the second drying air 52DA.

In the drying chamber 23B shown in Fig. 2, a large amount of heat energy is given to the flexible film 43 in order to evaporate the solvent from the flexible film 43. [ Therefore, the temperature of the flexible band 26 passing through the drying chamber 23B tends to increase. Therefore, when the dope 12 is plied to the heated flexible band 26, foaming of the dope 12 occurs. Therefore, as shown in Fig. 6, the film forming area cooler 55 for sending the cooling gas toward the back surface 26B is used after completion of the film drying process or just before the completion of the film drying process, The portion 55X for supporting the heat exchanger 43 may be cooled. It is preferable that the film forming area cooler 55 is provided at the most downstream side in the X direction of the drying chamber 23B or in the peeling chamber 23C.

The film forming area cooler 55 may be replaced by a film formation area having a die for applying a solvent to the back surface 26B and a drying section for evaporating the solvent applied to the back surface 26B on the downstream side of the die in the X direction A cooling section may be used.

 (Early roller-on)

As shown in Fig. 2, a roller-on pre-heater 57 is mounted on the horizontal roller 24, and a roller-on pre-heater 58 is mounted on the horizontal roller 25. [ The roller-on prime mover 57, 58 circulates the heat transfer medium controlled to a desired temperature in the flow paths provided in the roll bodies 24B, 25B under the control of the control unit. By circulating the heat transfer medium, the temperature of the roll bodies 24B and 25B can be maintained at a desired temperature. It is preferable that the temperature of the flexible surface 26A of the flexible band 26, particularly the portion where the flexible film 43 is formed, is controlled to be substantially constant within the range of 10 占 폚 to 40 占 폚.

 (Moving direction control device of annular band)

As shown in Figs. 3 and 4, an annular band moving direction control device 60 is provided in the drying chamber 23B. The moving direction control device 60 of the annular band includes a band one end temperature control unit 61P as a band tension control unit, a one-end band temperature control unit 61Q as an other end band tension control unit, an offset detection unit 65, 67 (see Fig. 8). Further, in Fig. 2, the moving direction control device 60 of the annular band is omitted in order to avoid the complication of the drawing.

 (Band-once tempera- ture unit)

As shown in Figs. 4 and 5, the band-one temperature control unit 61P is provided on the flexible surface 26A side and the back surface 26B side of the flexible band 26, respectively. The band-once heating unit 61P adjusts the temperature of the one end 26EP by applying a heating gas to one end 26EP of the flexible band 26 in the Y direction. Each of the bending unit 61P for each band is provided with a heating gas duct 61PA, a once-temperature gas feeder 61PB, and a once-temperature gas absorber 61PC. The heating gas duct 61PA is installed so as to oppose the flexible surface 26A and the back surface 26B of the one end portion 26EP and the heating gas 68 flows. Once the heating gas supply 61PB supplies the heating gas 68 to the heating gas duct 61PA. Once the heating gas aspirator 61PC sucks the heating gas 68 past the heating gas duct 61PA. The one-end heating gas duct 61PA disposed on the side of the flexible surface 26A is provided with an opening 61PO on the side of the duct facing the flexible surface 26A. The one-end heating gas duct 61PA disposed on the rear surface 26B side is provided with an opening 61PO on the duct surface facing the rear surface 26B. With each of the openings 61PO, the heating gas 68 once supplied to the heating gas duct 61PA comes into contact with the one end 26EP.

It is preferable that the band-one temperature-control unit 61P and the band-side-temperature-control unit 61Q are arranged in the Y direction. It is preferable that the heating gas duct 61PA and the other end heating gas duct 61QA are disposed on both sides of the first air supply duct 51A in the Y direction.

One end portion 26EP of the flexible band 26 in the Y direction refers to one of the portions excluding the portion 55X (see Fig. 6) for supporting the flexible film 43 in the flexible band 26 . The other end portion 26EQ of the flexible band 26 in the Y direction refers to the other portion of the portion excluding the portion 55X (see Fig. 6) for supporting the flexible film 43. Fig.

 (Second-stage temperature control unit)

The band other-end temperature control unit 61Q controls the temperature of the other end portion 26EQ by applying a heating gas 68 to the other end portion 26EQ of the flexible band 26 in the Y direction similarly to the band one-end temperature control unit 61P . The band other-end temperature control unit 61Q is provided on the flexible surface 26A side and the back surface 26B side of the flexible band 26, respectively. Each of the band-side temperature control units 61Q includes the other-end heating gas duct 61QA, the other-end heating gas supply unit 61QB, and the other-end heating gas absorber 61QC. The other-end heating gas duct 61QA is provided so as to oppose the flexible surface 26A and the back surface 26B of the other end 26EQ, respectively, and the heating gas 68 flows. The other-end heating gas supply 61QB supplies the heating gas 68 to the other-end heating gas duct 61QA. The other-end heating gas aspirator 61QC sucks the heating gas 68 past the other-end heating gas duct 61QA. The other-end heating gas duct 61QA disposed on the side of the flexible surface 26A is provided with an opening 61QO on the side of the duct facing the flexible surface 26A. The other end temperature gas duct 61QA disposed on the rear surface 26B side is provided with an opening 61QO on the duct surface opposite to the rear surface 26B. By this opening 61QO, the heating gas 68 supplied to the other-end heating gas duct 61QA comes into contact with the other end 26EQ.

The opening 61PO is extended to the outside in the Y direction with respect to the one end 26EP of the flexible band 26. [ It is also preferable that the openings 61PO are provided so as to extend to the outside in the Y direction with respect to the moving path described later. Similarly, the opening 61QO is extended to the outside in the Y direction with respect to the other end 26EQ of the flexible band 26. [ It is preferable that the opening 61QO is extended to the outside in the Y direction than the moving path 26R (see Fig. 7) described later.

 (Deviation detection unit)

As shown in Fig. 4, the deviation detection unit 65 is installed in the drying chamber 23B. 4 and 7, the deviation detection unit 65 includes a one-end deviation detection unit 65P provided on one end side of the flexible band 26 and another end deviation detection unit 65Q provided on the other end side of the flexible band 26, Respectively.

 (Once Detected)

The once-off detecting unit 65P includes a light emitting unit 65PA and a light receiving unit 65PB. The light emitting portion 65PA incorporates a light source, and externally irradiates inspection light from the light source. The light receiving unit 65PB incorporates an optical sensor capable of receiving the inspection light, and determines whether or not the optical sensor detects the inspection light from the light emitting unit 65PA. When the light receiving unit 65PB determines that the optical sensor has detected the inspection light, the light receiving unit 65PB outputs a detection signal. The light emitting portion 65PA and the light receiving portion 65PB are arranged in such a manner that the optical path 70PX of the inspection light from the light emitting portion 65PA to the light receiving portion 65PB is formed in the Y direction of the moving path 26R of the preset flexible band 26 As shown in FIG.

 (The other end detection part)

The other-end deviation detecting section 65Q includes a light emitting section 65QA and a light receiving section 65QB in the same manner as the once-off detecting section 65P. The light emitting portion 65QA incorporates a light source, and externally irradiates inspection light from the light source. The light receiving unit 65QB incorporates an optical sensor capable of receiving the inspection light, and determines whether or not the optical sensor detects the inspection light. When the light receiving unit 65QB determines that the optical sensor has detected the inspection light, the light receiving unit 65QB outputs a detection signal. The light emitting portion 65QA and the light receiving portion 65QB are arranged in such a manner that the optical path 70QX of the inspection light from the light emitting portion 65QA to the light receiving portion 65QB is formed at the other end in the Y direction of the moving path 26R of the flexible band 26 As shown in FIG.

The moving path 26R is a reference path of the flexible band 26 preset in the Y direction. The width of the moving path 26R (the length in the Y direction) may be the same as the width of the flexible band 26 or the width of the flexible band 26 plus a predetermined clearance width.

 (Control unit)

As shown in Fig. 8, the control unit 67 controls the heating gas feeder 61PB and the other-end heating gas feeder 61QB once. The control unit 67 includes a deviation direction determination unit 67A and a band-tempo control unit 67B as a band tension control unit.

The deviation direction determination section 67A determines whether or not a detection signal is output from the light receiving sections 67PB and 67QB. When it is determined that the detection signal is output from both of the light receiving portions 67PB and 67QB, the deviation direction determination unit 67A determines that the flexible band 26 is within the movement route 26R. On the other hand, when it is determined that the detection signal is output from the light receiving section 67QB and the detection signal is not output from the light receiving section 67PB, the deviation direction determination section 67A determines that the flexible band 26 is in the moving path 26R, It is judged that it has escaped to the one end side. When it is determined that the detection signal is output from the light receiving section 67PB and the detection signal is not output from the light receiving section 67QB, the deviation direction determining section 67A determines that the flexible band 26 is moving from the moving path 26R to the other end As shown in Fig.

The band temperature control unit 67B controls the temperature gas supply unit 61PB and the other end temperature gas supply unit 61QB based on the determination result of the departure direction determination unit 67A. The temperature of the heating gas 68 once fed by the heating gas feeder 61PB and the temperature of the heating gas 68 supplied by the other-end heating gas feeder 61QB are controlled individually by the band- .

 (Peeling room)

Returning to Fig. 2, a peeling roller 86 is provided in the peeling chamber 23C. The peeling roller 86 peels off the wet film 13 from the outlet 23CO provided in the peeling chamber 23C by using the flexible film 43 in the peelable state as the peeling wet film 13 from the flexible band 26, .

A condensing device for condensing the solvent contained in the atmosphere in the casing 23 and a recovery device for recovering the condensed solvent may be provided in the flexible device 15. Thereby, the concentration of the solvent contained in the atmosphere in the casing 23 can be maintained within a predetermined range.

Referring back to Fig. 1, a plurality of support rollers 87 for supporting the wet film 13 are arranged in a moving portion between the flexible device 15 and the clip tenter 17. The support roller 87 rotates about an axis by a motor (not shown). The support roller 87 supports the wet film 13 delivered from the flexible device 15 and guides it to the clip tenter 17. 1 shows the case where two support rollers 87 are arranged on the movable portion, the present invention is not limited to this, and one or more support rollers 87 may be arranged on the movable portion . The support roller 87 may be a free roller.

The clip tenter 17 has a plurality of clips for gripping both side edges in the width direction of the wet film 13, and the clip moves on the drawn orbit. The drying wind is sent to the wet film 13 gripped by the clip, and the wet film 13 is subjected to the drying treatment in addition to the stretching in the width direction.

An edge cutting device 88 is provided between the clip tenter 17 and the drying device 18. At both ends in the width direction of the film 16 fed to the edge cutting device 88, a gripping mark formed by a clip is formed. The edge cutting device 88 cuts both end portions having this gripping edge. The cut portion is sent to a cut blower (not shown) and a crusher (not shown) in succession by blowing, and finely cut to be reused as a raw material such as a dope.

The drying device 18 includes a casing having a conveying path for the film 16, a plurality of rollers 18A for forming a conveying path for the film 16, an air conditioner (Not shown). The film 16 introduced into the casing is conveyed while being wound around a plurality of rollers 18A. By controlling the temperature and the humidity of the atmosphere, the solvent remaining from the film 16 conveyed in the casing is evaporated. The adsorption recovery device for adsorbing the solvent evaporated from the film 16 is connected to the drying device 18.

A cooling chamber 89, a discharge bar (not shown), a knurling roller 90, and an edge cutting device (not shown) are arranged in this order from the upstream side of the drying device 18 and the winding device 19, Respectively. The cooling chamber 89 cools the film 16 until the temperature of the film 16 becomes approximately room temperature. The static eliminating bar performs a static eliminating process for removing electricity from the charged film 16 discharged from the cooling chamber 89. The knurling imparting roller (90) imparts a winding knurling to both ends in the width direction of the film (16). The edge cutting device cuts both ends in the width direction of the film 16 so that a knurling is left at both ends in the width direction of the film 16 after cutting.

The winding device 19 has a press roller 19A and a winding paddle 19B. The film 16 sent to the winding device 19 is wound on the winding spindle 19B while being pressed by the press roller 19A to be rolled.

Next, the operation of the present invention will be described. As shown in Figs. 2 and 3, a motor control unit (not shown) rotates the horizontal roller 24 through the roller driving motor 24M. As a result, the flexible band 26 sequentially circulates the respective chambers 23A to 23C.

 (Film forming step)

In the flexible chamber 23A, the flexible process of forming the flexible film 43 composed of the dope 12 on the flexible band 26 is performed. The flexible die 40 continuously drains the dope 12 from the dope outlet 40A. The drained dope 12 forms a bead from the flexible die 40 to the flexible band 26 and extends on the flexible band 26. Thus, a flexible film 43 composed of a dope 12 is formed on the flexible band 26 (see Fig. 9).

The pressure reducing unit 41 can make the pressure on the upstream side in the X direction of the bead lower than the pressure on the downstream side in the X direction of the bead. The pressure difference? P on the upstream side in the X direction and the downstream side in the X direction of the bead is preferably 10 Pa or more and 2000 Pa or less.

 (Film drying process)

In the drying chamber 23B, a film drying process is performed in which a predetermined drying air is applied to the flexible film 43 to evaporate the solvent from the flexible film 43. [ The film drying process is performed until the flexible film 43 becomes self-supporting and ready to be transported. In the film drying step, the first drying step and the second drying step are performed sequentially.

 (First drying step)

In the first drying step, the solvent is evaporated from the flexible film 43 until the drying layer 43A (see Fig. 10) is formed on the surface layer of the flexible film 43. Then, As shown in Fig. 2, the first drying unit 51 sends out the first drying air 51DA from the first air mechanism 51AO.

By the first drying step, the flexible film 43 has the dry layer 43A and the wet layer 43B (see FIG. 10). The drying layer 43A is a portion which is generated on the surface side of the flexible film 43 and is dried compared to the wetting layer 43B located on the flexible band 26 side than the drying layer 43A. Therefore, the content of the solvent in the drying layer 43A is lower than that in the wetting layer 43B. In addition, the surface of the drying layer 43A is formed smoothly. The surface of the dried layer 43A becomes the surface of the obtained flexible film 43 when a predetermined drying process is performed on the flexible film 43 having the dried layer 43A. Therefore, by forming the drying layer 43A in the flexible film 43 immediately after formation, the flexible film 43 having a smooth surface can be obtained.

Here, the content of the solvent represents the amount of the solvent contained in the flexible film 43 and each of the films 13 and 16 on the basis of the dry weight. A sample is taken from the target flexible film and film, When the weight of the sample after drying is y, it is calculated as {(xy) / y} x 100.

The first drying step is preferably carried out for the flexible film 43 having a solvent content of not less than 250 mass% and not more than 400 mass%, and the flexible film 43 having a solvent content of not less than 300 mass% and not more than 350 mass% ) Is more preferable. The temperature of the first drying air 51DA is preferably in the range of 30 DEG C or more and 80 DEG C or less. It is preferable that the wind speed of the first drying air 51DA is in the range of 5 m / sec to 25 m / sec.

 (Second drying step)

In the second drying step, the second drying air 52DA is used to evaporate the solvent from the flexible film 43 until it becomes self-supporting and transportable. The second drying unit 52 flows the second drying air 52DA along the film surface of the flexible film 43 from the downstream side in the X direction toward the upstream side. By thus flowing the second drying air 52DA in the direction opposite to the X direction, the evaporation of the solvent is promoted as compared with the case where the second drying air 52DA flows in the X direction. The second drying step is preferably carried out for the flexible film 43 in which the content of the solvent is in the range of 20 mass% to 150 mass%. The temperature of the second drying air 52DA is preferably in the range of 40 DEG C or more and 80 DEG C or less. It is preferable that the wind speed of the second drying air 52DA is in the range of 5 m / sec to 20 m / sec.

 (Peeling process)

In the peeling chamber 23C, a peeling process for peeling the flexible film 43 in a peelable state from the flexible band 26 is performed. The peeling roller 86 peels off the wet film 13 from the outlet 23CO provided in the peeling chamber 23C by using the flexible film 43 in the peelable state as the peeling wet film 13 from the flexible band 26, . The peeling step is preferably performed on the flexible film 43 having a solvent content of 20 mass% or more and 80 mass% or less.

Next, the operation of the movement direction control device 60 will be described. The movement direction control device 60 performs a movement control process. In this movement control process, deviation detection processing, deviation direction determination processing, and band tension adjustment processing are performed.

In the deviation detecting process, the light receiving unit 65PB determines whether or not the light sensor detects the inspection light from the light emitting unit 65PA. When the light receiving unit 65PB determines that the light sensor has detected the inspection light, the light receiving unit 65PB outputs the detection signal. When the light sensor does not detect the inspection light, the light receiving unit 65PB does not output the detection signal . In the deviation detecting process, the light receiving unit 65QB determines whether or not the light sensor detects the inspection light from the light emitting unit 65QA. The light receiving unit 65QB outputs a detection signal when the light receiving unit 65QB determines that the light sensor has detected the inspection light and the light receiving unit 65QB outputs the detection signal when the light receiving unit 65QB does not detect the inspection light I never do that.

In the departure direction determination processing, the departure direction determination section 67A determines whether or not a detection signal is output from the light receiving sections 65PB and 65QB.

For example, when the flexible band 26 that circulates in the state of being wound around the horizontal rollers 24 and 25 is in the moving path 26R, a detection signal is outputted from the light receiving unit 65PB and the light receiving unit 65QB . Therefore, the deviation direction determination section 67A determines that a detection signal is output from the light-receiving section 65PB and the light-receiving section 65QB. The deviation direction determination section 67A determines that the flexible band 26 is in the moving path 26R when it is determined that the detection signal is output from the light receiving section 65PB and the light receiving section 65QB. Thereafter, the deviation direction determination section 67A subsequently determines whether or not a detection signal is output from the light-receiving sections 65PB and 65QB.

On the other hand, as shown in Fig. 11, when the flexible band 26, which is circulatingly moved in the state of being wound around the horizontal rollers 24 and 25, deviates from the moving path 26R to the other end, . The deviation direction determination section 67A determines that no detection signal is output from the light receiving section 65QB. When it is determined that the detection signal is not outputted from the light receiving unit 65QB, the deviation direction determination unit 67A determines that the flexible band 26 has deviated from the moving path 26R to the other end side. Thereafter, the deviation direction determination section 67A subsequently determines whether or not a detection signal is output from the light-receiving sections 65PB and 65QB. As described above, the direction in which the flexible band 26 deviates from the moving path 26R is specified.

In the band tension adjusting process, the band-tempo control section 67B determines whether or not the flexible band 26 deviates from the moving path 26R out of the flexible band 26 based on the determination result that the flexible band 26 deviates from the moving path 26R to the other end side That is, the other end 26EQ is preferentially cooled over the end opposite to the off-direction, that is, the end 26EP.

The only way to cool the other end 26EQ more preferentially than the one end 26EP is to lower only the temperature of the temperature control gas 68 supplied by the other end temperature gas feeder 61QB. Instead of this method, the temperature of the heating gas 68 supplied by both the heating gas feeders 61PB and 61QB may be lowered while the temperature of the heating gas 68 on the side of the other heating gas supplying device 61QB may be lowered There is a way to increase the decline.

When the end of the flexible band 26 in the direction deviating from the moving path 26R is preferentially cooled over the end portion on the side opposite to the off direction until the output of the detection signal is resumed from the light receiving section that has stopped outputting the detection signal , It is desirable to gradually increase the degree of cooling of the end portion of the flexible band 26 in the direction away from the moving path 26R.

When the other end 26EQ of the flexible band 26 in a state in which a constant tension is applied in the Y direction is cooled preferentially over the one end 26EP, the stress at the other end 26EQ is equal to the stress at the one end 26EP Is larger than the stress in the case of the first embodiment. As a result, the tension applied to the other end 26EQ becomes larger than the tension applied to the one end 26EP. As a result, the flexible band 26 is moved in the direction in which the tension applied to the one end portion 26EP and the other end portion 26EQ is balanced, that is, as a result of sliding toward the one end portion 26EP from the other end portion 26EQ , The flexible band 26 returns to the traveling path 26R.

The same applies to the case where the deviation direction determination section 67A determines that the flexible band 26 has deviated from the moving path 26R to the one end side. That is, the band-temp control section 67B preferentially cools one end portion 26EP over the other end portion 26EQ based on the determination result that the flexible band 26 has deviated to the one end side from the travel path 26R. When the one end 26EP is cooled preferentially to the other end 26EQ, the tension applied to the one end 26EP of the flexible band 26 is increased. As a result, (26EQ). As a result, the flexible band 26 is moved in the direction in which the tension applied to the one end portion 26EP and the other end portion 26EQ is balanced, that is, as a result of sliding from the one end portion 26EP toward the other end portion 26EQ , The flexible band 26 returns to the traveling path 26R.

As described above, according to the present invention, by controlling the tension applied to the one end portion 26EP and the other end portion 26EQ of the flexible band 26 deviating from the moving path 26R, And can return to the traveling path 26R.

In the above embodiment, the heating gas duct 61PA is provided at the flexible surface 26A side and the back surface 26B side of the flexible band 26 respectively. However, the one end heating gas duct 61PA at the flexible surface 26A side And the one-end heating gas duct 61PA on the side of the back surface 26B may be integrally formed (see Fig. 12). However, the configuration shown in Fig. 5 is preferable in that it does not come into contact with the flexible band 26 which is out of the traveling path 26R because it has the margin portion.

It is preferable that once the heating gas duct 61PA is movable in the Y direction. Particularly, the heating gas duct 61PA may be once shifted in the Y direction so as to follow the position of the flexible band 26. [

The position where the band-side ON / OFF unit 61P and the band-side ON / OFF unit 61Q are provided may be any position in the X direction. Other embodiments of the present invention will be described below, but the same components as those of the above embodiment are denoted by the same reference numerals, and a detailed description thereof will be omitted.

In the above embodiment, the band one end temperature control unit 61P is used as the band tension control unit and the band one end temperature control unit 61Q is used as the other end band tension control unit. However, the present invention is not limited to this.

 (Second Embodiment)

As shown in Fig. 13, once the band tension adjusting unit is used, the band single-stage heating unit 98 having the coating die 100P, the solvent evaporator 101P once, and the solvent pump 102P once may be used. Once, the coating die 100P applies a solvent for one end to the one end 26EP. Once the solvent evaporator 101P evaporates the applied solvent for one end. Once the solvent pump 102P supplies the solvent for one end to the application die 100P. Likewise, the other-end band tension adjusting unit may be a band other-end heating unit 99 including a second-stage coating die 100Q, a second-stage solvent evaporator 101Q and a second-stage solvent pump 102Q. The other end applying die 100Q applies the other end use solvent to the other end 26EQ. The other-end solvent evaporator 101Q evaporates the applied other-end solvent. The other-stage solvent pump 102Q supplies the other-stage solvent to the other-stage coating die 100Q.

Once the solvent pump 102P is connected to the coating die 100P through a pipe (not shown). Once the coating die 100P has an outflow port for discharging the solvent for one end, the outflow port is arranged so as to face the flexible surface 26A of the one end 26EP. Once the solvent evaporator 101P is disposed on the downstream side in the X direction with respect to the application die 100P. Once the solvent evaporator 101P has an air supply mechanism for delivering the drying gas for drying the solvent for one end, the air supply mechanism is disposed so as to face the flexible surface 26A of the one end 26EP. The other-end solvent pump 102Q is connected to the other-end coating die 100Q through a pipe (not shown). The other end coating die 100Q is disposed such that the other end outflow opening faces the flexible surface 26A of the other end 26EQ. The other end evaporator 101Q is disposed on the downstream side in the X direction with respect to the other end coating die 100Q. The other-end evaporator 101Q is provided with a second stage stage mechanism for delivering a drying gas for drying the solvent for the other stage and the other stage stage mechanism is disposed so as to face the flexible surface 26A of the other end 26EQ.

14, the control unit 67 controls the solvent pump 102P and the other-end solvent pump 102Q. The control unit 67 includes a deviation direction determination unit 67A and a band-tone control unit 67B.

The band temperature control unit 67B controls the solvent pump 102P and the other end solvent pump 102Q once based on the determination result of the deviation direction determination unit 67A. The amount of the solvent for one stage to be supplied to the coating die 100P and the amount of the other solvent to be supplied to the other stage coating die 100Q can be adjusted by the control of the band temperature control unit 67B.

Once the solvent evaporator 101P delivers the drying gas toward the flexible surface 26A of the one end 26EP so that the solvent for one end coated on the flexible surface 26A is completely evaporated. For this reason, the one end 26EP is cooled by the amount of vaporization heat. That is, the one end portion 26EP can be cooled by an amount corresponding to the application amount of the solvent for one end. Likewise, the other-end solvent evaporator 101Q sends dry gas toward the flexible surface 26A of the other end portion 26EQ so that the other-end solvent applied to the flexible surface 26A is completely evaporated. Therefore, the other end 26EQ is cooled by the amount of vaporization heat. That is, the other end portion 26EQ can be cooled by an amount corresponding to the application amount of the other-end solvent. The amount of application of each solvent in the one end portion 26EP and the other end portion 26EQ is adjustable by the control of the solvent pump 102P and the other end solvent pump 102Q. The cooling of the one end portion 26EP and the cooling of the other end portion 26EQ can be controlled independently by the components 100P to 102P and 100Q to 102Q and the control unit 67. [

The position where the band tension adjusting portion and the other end band tension adjusting portion are once provided may be either the side of the flexible surface 26A or the side of the back surface 26B or both of the flexible surface 26A and the back surface 26B.

The solvent for one stage and the solvent for the other stage may be the same or different. It is also preferable to use the solvent contained in the dope as a solvent for one end and a solvent for the other end.

 (Third Embodiment)

For example, as shown in Fig. 15, the roller one-end temperature control unit 108 may be used as the band tension control unit and the roller one-end temperature control unit 109 may be used as the other end band tension control unit. The roller once-stage unit 108 includes a heating nozzle 110P and a heating gas supply unit 111P. Once the heating nozzle 110P delivers the heating gas to one end of the roller body 24B (hereinafter referred to as the roller portion 24BP). Once the heating gas supply unit 111P supplies the heating gas to the heating nozzle 110P. The roller-side step-by-step heating unit 109 is provided with the other-end temperature-controlled nozzle 110Q for sending the heating gas to the other end (hereinafter referred to as the other-end roller portion) 24BQ of the roller body 24B, And the other-end heating gas supply unit 111Q for supplying the heating gas.

16, the control unit 67 controls the heating gas supply unit 111P and the other-end heating gas supply unit 111Q. The control unit 67 includes a deviation direction determination unit 67A, a band- And a control unit 67B.

Once the heating gas supply unit 111P creates a heating gas of a predetermined temperature under the control of the band temperature control unit 67B and supplies the heating gas to the roller unit 24BP once. Likewise, the other-end temperature gas supply unit 111Q generates a heating gas of a predetermined temperature under the control of the band-temp. Control unit 67B, and supplies the heating gas to the other-end roller unit 24BQ. The roll main body 24B having the roller portion 24BP and the other end roller portion 24BQ whose temperature is controlled by the contact with the heating gas supports the flexible band 26 in the entire Y direction, The temperature of the one end portion 26EP of the flexible band 26 supported by the roll body 24B is adjustable according to the temperature of the roller portion 24BP. Likewise, the temperature of the other end 26EQ of the flexible band 26 supported by the roll body 24B is adjustable according to the temperature of the other end roller portion 24BQ. The temperature of the one end portion 26EP and the temperature of the other end portion 26EQ can be independently controlled by the components 110P to 111P and 110Q to 111Q and the control unit 67. [

 (Fourth Embodiment)

As shown in Fig. 17, a roller single-stage temperature-adjusting unit 118 having a coating die 120P, a single-stage solvent evaporator 121P and a single-stage solvent pump 122P may be used. Once the application die 120P applies the solvent for one end to the roller portion 24BP once. Once the solvent evaporator 121P evaporates the applied solvent for one end. Once the solvent pump 122P supplies the solvent for one end to the application die 120P. Likewise, a roller-side step-by-step temperature-controlling unit 119 including a second-stage coating die 120Q, a second-stage solvent evaporator 121Q and a second-stage solvent pump 122Q may be used. The other end applying die 120Q applies the other end use solvent to the other end roller portion 24BQ. The other-end solvent evaporator 121Q evaporates the applied other-end solvent. The other-stage solvent pump 122Q supplies the other-stage solvent to the other-stage coating die 120Q.

Once the solvent pump 122P is connected to the coating die 120P through a pipe (not shown). Once the application die 120P has an outflow port for discharging the solvent for one end, the outlet port is arranged so that the outflow port is once opposed to the flexible surface 26A of the roller portion 24BP. Once the solvent evaporator 121P is disposed on the downstream side in the X direction with respect to the application die 120P. Once the solvent evaporator 121P has a supply mechanism for discharging the drying gas for drying the solvent for one end, the supply mechanism is arranged so that the supply mechanism once faces the roller portion 24BP. The other-end solvent pump 122Q is connected to the other-end coating die 120Q through a pipe (not shown). The other end coating die 120Q is arranged so as to have the other end outflow port for discharging the solvent for the other end and the other end outlet to face the other end roller portion 24BQ. The other end evaporator 121Q is arranged on the downstream side in the X direction with respect to the other end coating die 120Q. The other-end evaporator 121Q is provided with an other-end feed mechanism for feeding dry gas for drying the other-end solvent, and the other-end feeder is arranged so as to face the other-end roller portion 24BQ.

18, the control unit 67 controls the solvent pump 122P and the other-end solvent pump 122Q. The control unit 67 includes a deviation direction determination unit 67A and a band-tone control unit 67B.

The band temperature control unit 67B controls the solvent pump 122P and the other end solvent pump 122Q once based on the determination result of the deviation direction determination unit 67A. The amount of the solvent for one stage to be supplied to the coating die 120P and the amount of the other solvent to be supplied to the other stage coating die 120Q can be adjusted by the control of the band temperature control unit 67B.

The solvent evaporator 121P once sends out the drying gas toward the roller portion 24BP so that the one-end solvent once applied to the roller portion 24BP evaporates. For this reason, once the roller portion 24BP is cooled by the amount of vaporization heat. That is, the roller portion 24BP can be cooled once by an amount corresponding to the application amount of the solvent for one stage. Likewise, the other-end solvent evaporator 121Q sends dry gas toward the other-end roller portion 24BQ so that the other-end solvent applied to the other-end roller portion 24BQ evaporates. Therefore, the other-end roller portion 24BQ is cooled by the amount of vaporization heat. That is, the other end roller portion 24BQ can be cooled by an amount corresponding to the application amount of the solvent for the other end. The application amount of each solvent in the roller portion 24BP and the other roller portion 24BQ can be adjusted by the control of the solvent pump 122P and the other end solvent pump 122Q. Therefore, the cooling of the roller portion 24BP and the cooling of the other-end roller portion 24BQ can be independently controlled by the respective components 120P to 122P and 120Q to 122Q and the control unit 67. [

 (Fifth Embodiment)

The flow path of the heat transfer medium provided in the roller body 24B may be provided as follows. 19 and 20, one side internal flow path 130R is provided on the one side roller portion 24BR in the Y direction among the roller main bodies 24B and the other internal side flow path 130R on the Y side direction of the roller main body 24B 24BL, the other internal flow path 130L may be provided. The one-side internal flow path 130R and the other-side internal flow path 130L are preferably formed in a spiral shape in the vicinity of the peripheral surface of the roller body 24B.

In this case, the roller-on-aerator 57 equipped with the one-side roller-on fine gear 57R and the other roller-on fine gear 57L is used. The one side roller warmer 57R has one side warming portion 57RA, one side roller-on tuning portion 57RB, and one side retrieving portion 57RC. The one-side warming portion 57RA regulates the temperature of the heat transfer medium for the one-side internal flow path 130R. On the one side roller-tightening portion 57RB, the heat transfer medium whose temperature is controlled by the one side warming portion 57RA is supplied to the one side internal passage 130R. The one-side recovery unit 57RC recovers the heat transfer medium that has passed through the one-side internal flow path 130R and sends it to the one-side warming unit 57RA. The other roller on retarder 57L has the other side warming portion 57LA, the other roller on stay portion 57LB, and the other side retracting portion 57LC. The other side warming portion 57LA regulates the temperature of the heat transfer medium for the other side internal flow path 130L. On the other hand, the other roller-on tuning part 57LB supplies the heat transfer medium whose temperature is controlled by the other side warming part 57LA to the other internal channel 130L. The other-side recovery section 57LC retrieves the heat transfer medium that has passed through the other-side built-in oil passage 130L and sends it to the other-side heating section 57LA.

21, the control unit 67 controls one side warming portion 57RA and the other side warming portion 57LA and includes a deviation direction determination portion 67A and a band temperature control portion 67B.

The band temperature control unit 67B controls the one side warming unit 57RA and the other side warming unit 57LA based on the determination result of the deviation direction determination unit 67A. The temperature of the heat transfer medium supplied to the one-side internal flow path 130R and the temperature of the heat transfer medium supplied to the other internal flow path 130L can be independently controlled by the control of the band temperature control section 67B. Therefore, the roller body 24B having the one-side internal flow path 130R and the other internal flow path 130L and the roller-ON type air-conditioner 57 having the one-side roller-ON air-conditioner 57R and the other- The temperature of the roller portion 24BP and the temperature of the other end roller portion 24BQ can be independently adjusted.

It is also possible to provide a flow path through which the heat transfer medium flows to the one end roller portion 24BP, the other end roller portion 24BQ and the middle portion 24BC in the Y direction of the roller body 24B, It may be supplied to the roller portion 24BP, the other roller portion 24BQ and the central portion 24BC, respectively.

In the above embodiment, the roller-on-aerator 57 including the one-side roller-on fine gear 57R and the other roller-on fine gear 57L has been described. However, the present invention is not limited to this, And the roller-on-fine 58 (see Fig. 19) provided with the other roller-on advance 58L may be used.

In addition, each end of the flexible band (26) and the roller body (25) are connected to each other by using a dry ice sprayer for spraying dry ice on the object to be cooled, as a band- 24B may be cooled.

Instead of the method of cooling the one end portion 26EP with preference to the other end portion 26EQ by the band temperature control section 67B, the band-stop control section 67B may control the other end portion 26EQ from the one end portion 26EP It may be preferentially heated. In this case, the end of the flexible band 26 on the opposite side from the direction away from the moving path 26R may be preferentially heated than the end in the off-direction.

2, when the film forming process, the film drying process, and the peeling process are repeated in the casing 23 in succession, curling occurs at both ends of the flexible band 26 in the Y direction .

The reason why the both ends of the flexible band 26 in the Y direction in the membrane drying process is curled is considered as follows. In the film forming process, the flexible band 26 in the entire Y direction is supported by the roller body 24B adjusted to a predetermined temperature. Therefore, the temperature of the flexible band 26 in the entire Y direction is substantially constant. In the film drying process, since the solvent is evaporated from the flexible film 43 at the central portion in the Y direction of the flexible band 26 supporting the flexible film 43, the temperature at the central portion in the Y direction of the flexible band 26 is lowered. On the other hand, since evaporation of the solvent does not occur at the both ends in the Y direction of the flexible band 26, the temperature at both ends in the Y direction of the flexible band 26 does not change much. Thus, in the flexible band 26 of the film drying process, a temperature distribution which becomes high in temperature from the central portion in the Y direction toward both ends in the Y direction is generated. By this temperature distribution in the Y direction, both ends of the flexible band 26 in the Y direction are curled.

Therefore, in order to prevent the curling of both ends of the flexible band 26 in the Y direction, both ends of the flexible band 26 in the Y direction are cooled so that the temperature of the flexible band 26 in the film drying process becomes uniform in the Y direction Is preferably carried out in parallel with the film drying step. As the cooling means at both ends in the Y direction of the flexible band 26, any one of the band one-end temperature control unit, the band one-end temperature control unit, the roller one-end temperature control unit and the roller one-end temperature control unit may be used. It is preferable that the cooling means at the both ends in the Y direction of the flexible band 26 are provided between the horizontal rollers 24 and 25. The cooling range by the cooling means at both ends in the Y direction of the flexible band 26 is not in contact with any part between the horizontal rollers 24 and 25, that is, the horizontal rollers 24 and 25 desirable. It is preferable that the cooling step starts simultaneously with the first drying step.

The flexible die 40 is disposed above the horizontal roller 24, but the present invention is not limited to this. When the first and second seal members 31 to 32 are provided so as to be close to the portion of the flexible band 26 wound around the horizontal roller 25, It may be upward. A support roll for supporting the flexible band 26 is disposed between the horizontal rollers 24 and 25 and the first to second seal members 31 to 32 are fixed to the flexible band 26 The mounting position of the flexible die 40 may be the upper side of the support roll.

In any of the above embodiments, friction between the horizontal rollers 24, 25 and the flexible band 26 is suppressed.

The film (16) obtained by the present invention can be used particularly for a retardation film and a polarizing plate protective film.

The width of the film 16 is preferably 600 mm or more, more preferably 1400 mm or more and 2500 mm or less. The present invention is also effective when the width of the film 16 is larger than 2500 mm. The film thickness of the film 16 is preferably 20 m or more and 80 m or less.

The in-plane retardation (Re) of the film 16 is preferably 20 nm or more and 300 nm or less, and the retardation (Rth) in the thickness direction of the film 16 is preferably -100 nm or more and 300 nm or less.

The measurement method of in-plane retardation (Re) is as follows. The in-plane retardation (Re) was measured by measuring the retardation value measured from the vertical direction at 632.8 nm with an automatic birefringence meter (KOBRA21DH Outer Instrumentation Co., Ltd.) by humidifying the sample film at 25 ° C and 60% RH for 2 hours . Re is represented by the following formula.

Re = | n1-n2 | xd

n1 is the refractive index of the slow axis, n2 is the refractive index of the fast axis 2, and d is the thickness (film thickness) of the film.

A method of measuring the retardation in the thickness direction (Rth) is as follows. The sample film was conditioned at 25 ° C and 60% RH for 2 hours, measured with an erosion meter (manufactured by M150 Nihon Bunko Co., Ltd.) at 632.8 nm from the vertical direction, and measured with the film surface inclined By the extrapolated value of one retardation value according to the following formula.

Rth = {(n1 + n2) / 2-n3} xd

and 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 a cellulose acylate and a cyclic polyolefin.

 (Cellulose acylate)

The acyl group used in the cellulose acylate of the present invention may be only one kind, or two or more kinds of acyl groups may be used. When two or more kinds of acyl groups are used, one of them is preferably an acetyl group. It is preferable that the ratio of esterification of the hydroxyl group of cellulose with a carboxylic acid, that is, the substitution degree of the acyl group satisfies all of the following formulas (I) to (III). In the following formulas (I) to (III), A and B represent substitution degrees of an acyl group, A represents a degree of substitution of an acetyl group, and B represents substitution of an acyl group having 3 to 22 carbon atoms . It is also preferable that 90 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 acyl 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. The substitution degree (B) of the acyl group having 3 to 22 carbon atoms is more preferably 0.30 or more, and particularly preferably 0.5 or more.

Cellulose as a raw material of cellulose acylate may be obtained from any of linter and pulp.

The acyl group having 2 or more carbon atoms in the cellulose acylate of the present invention may be an aliphatic group or an aryl group and is not particularly limited. They may be, for example, alkylcarbonyl esters, alkenylcarbonyl esters or aromatic carbonyl esters of cellulose, aromatic alkylcarbonyl esters and the like, each of which may further have a substituted group. Preferable examples thereof include propionyl, butanoyl, pentanoyl, hexanoyl, octanoyl, decanoyl, dodecanoyl, tridecanoyl, tetradecanoyl, hexadecanoyl, octadecanoyl, iso-butanoyl, Butanoyl, cyclohexanecarbonyl, oleoyl, benzoyl, naphthylcarbonyl, cinnamoyl and the like. Among them, propionyl, butanoyl, dodecanoyl, octadecanoyl, t-butanoyl, oleoyl, benzoyl, naphthylcarbonyl and cinnamoyl are more preferable, and propionyl and butanoyl are particularly preferable .

 (solvent)

Examples of the solvent for preparing the dope include aromatic hydrocarbons such as benzene and toluene, halogenated hydrocarbons such as dichloromethane and chlorobenzene, alcohols such as methanol, ethanol, n-propanol, n (For example, acetone, methyl ethyl ketone and the like), esters (for example, methyl acetate, ethyl acetate and acetic acid propyl) and ethers (for example, tetrahydrofuran, Methyl cellosolve, etc.) and the like. In the present invention, it means a polymer solution or dispersion obtained by dissolving or dispersing a polymer in a solvent.

Of these, halogenated hydrocarbons having 1 to 7 carbon atoms are preferably used, and dichloromethane is most preferably used. From the viewpoints of the solubility of the polymer, the peelability of the flexible film from the support, the mechanical strength of the film, and the physical properties such as the optical properties of the film, it is preferable to mix one or more alcohols having 1 to 5 carbon atoms in addition to dichloromethane Do. The content of the alcohol is preferably 2% by mass to 25% by mass, more preferably 5% by mass to 20% by mass, based on the whole solvent. Specific examples of the alcohol include methanol, ethanol, n-propanol, isopropanol, n-butanol and the like, but methanol, ethanol, n-butanol or a mixture thereof is preferably used.

However, in recent years, for the purpose of suppressing the influence on the environment to the minimum, the solvent composition in the case of not using dichloromethane has also been studied. For this purpose, an ether having 4 to 12 carbon atoms, a carbon atom A ketone having a number of 3 to 12, an ester having a carbon atom number of 3 to 12, and an alcohol having a carbon atom number of 1 to 12 are preferably used. And these may be appropriately mixed and used. Examples thereof include mixed solvents of methyl acetate, acetone, ethanol and n-butanol. These ethers, ketones, esters and alcohols may have a cyclic structure. Furthermore, a compound having two or more functional groups of ether, ketone, ester and alcohol (i.e., -O-, -CO-, -COO- and -OH) can also be used as a solvent.

Further, details of the cellulose acylate are described in paragraphs [0140] to [0195] of JP-A No. 2005-104148. These substrates are also applicable to the present invention. The additives such as a solvent and a plasticizer, a deterioration inhibitor, an ultraviolet absorber (UV), an optically anisotropic control agent, a retardation control agent, a dye, a matting agent, a releasing agent and a peeling promoter are likewise disclosed in Japanese Patent Laid-Open No. 2005-104148 Are described in detail in paragraph [0516] to paragraph [0596].

Claims (20)

An apparatus for controlling the moving direction of an annular band made of stainless steel which is wound on a driving roller and driven rollers arranged in parallel and which can move a predetermined traveling path image in the width direction by rotation of the driving roller,
A one-end band tension adjuster capable of adjusting a tension of one end portion in the width direction of the annular band,
End band tension adjuster capable of adjusting the tension at the other end in the width direction of the annular band,
A band tension control unit for controlling the one-end band tension adjusting unit or the one-end band tension adjusting unit so that the tension at the end of the annular band deviated from the traveling path is greater than the tension at the end opposite to the off- And a control unit,
Wherein the one-end band tension adjusting unit has a band one-end temperature adjusting unit for adjusting the temperature of the one end side in the width direction of the annular band,
And the other end band tension adjusting portion has a band other end temperature adjusting portion for adjusting the temperature of the other end side in the width direction of the annular band,
The band tension control section has a band temperature control section for controlling the band one end tempering section and the band one end tempering section so as to preferentially cool the end of the annular band in the direction deviated from the direction opposite to the deviation direction Of the moving direction of the annular band. The method according to claim 1,
Wherein the band-one tempering section supplies a heating gas to one end side in the width direction of the band,
And the other-end-side temperature control section supplies the heating gas to the other end side in the width direction of the band. The method according to claim 1,
Wherein the band-
A one-end band applicator for applying one liquid to one end side in the width direction of the band,
A band evaporator which evaporates the one liquid applied to one end side in the width direction of the band,
And the other-
An other-end band applicator for applying a different liquid to the other end side in the width direction of the band,
And an other-end band evaporator for evaporating the other liquid applied to the other end side in the width direction of the band. An apparatus for controlling the moving direction of an annular band made of stainless steel which is wound on a driving roller and driven rollers arranged in parallel and which can move a predetermined traveling path image in the width direction by rotation of the driving roller,
A one-end band tension adjuster capable of adjusting a tension of one end portion in the width direction of the annular band,
End band tension adjuster capable of adjusting the tension at the other end in the width direction of the annular band,
A band tension control unit for controlling the one-end band tension adjusting unit or the one-end band tension adjusting unit so that the tension at the end of the annular band deviated from the traveling path is greater than the tension at the end opposite to the off- And a control unit,
Wherein the one-end band tension adjusting unit has a roller one-end temperature adjusting unit for adjusting the temperature at one end in the width direction of any one of the driving roller and the driven roller,
And the other-end band tension adjuster has a roller-side-end temperature-adjusting section for adjusting a temperature at the other end in the width direction of the roller,
And the band tension control section has a roller temperature control section for controlling the roller one end warming section or the roller one end temperature warming section so as to preferentially cool the end of the annular band in the deviating direction than the end opposite to the deviation direction Of the moving direction of the annular band. 5. The method of claim 4,
Wherein the roller one-end heating portion supplies a heating gas to one end side in the width direction of the roller,
And the other-end-side temperature control section supplies the heating gas to the other end side in the width direction of the roller. 5. The method of claim 4,
The roller
A one-end flow path which is built in one end side in the width direction and in which the one-end temperature control medium can flow,
The other end side temperature regulating medium being provided at the other end side in the width direction,
Wherein the one-end temperature control means supplies the one-end temperature control medium to the one-end flow path,
And the other-end temperature control section supplies the other-end-side temperature control medium to the other-end flow path. 5. The method of claim 4,
The roller once-
A one-end roller applicator for applying one liquid to one end side in the width direction of the roller,
And a roller evaporator which evaporates the one liquid applied to one end side in the width direction of the roller,
The roller other-end temperature-
A second roller applicator for applying another liquid to the other end in the width direction of the roller,
And an other-end roller evaporator for evaporating the other liquid applied to the other end side in the width direction of the roller. 8. The method according to any one of claims 1 to 7,
And a departure direction determination section that determines whether or not the annular band is deviated in one of the one end side in the width direction or the other end side in the width direction. A flexible die for flowing a dope including a polymer and a solvent toward the annular band,
The annular band having a support surface for supporting the dope discharged therefrom and forming a film made of the dope on the support surface,
A solvent evaporator for evaporating the solvent from the film,
A peeling device for peeling the film from the annular band,
An apparatus for controlling a moving direction of an annular band according to any one of claims 1 to 4,
And an end cooling unit for cooling both end portions in the width direction of the annular band. 10. The method of claim 9,
Wherein the both end cooling device cools portions of the bands away from the rollers. A dope including a polymer and a solvent is flowed toward a ring-shaped band made of stainless steel, which is wound on a drive roller and a driven roller arranged in parallel and movable by a rotation of the drive roller, A film forming step of forming a film made of the doped film on the band surface of the annular band;
A one-end band tension adjusting part capable of adjusting a tension at one end in the width direction of the annular band so that the tension at the end of the annular band in the direction away from the traveling path is larger than the tension at the end opposite to the direction, And a band tension balancing step of controlling the other end band tension adjusting part capable of adjusting the tension at the other end in the width direction of the annular band,
A film drying step of applying air to the film on the band surface to evaporate the solvent from the film,
A peeling step of peeling the film after the film drying step from the annular band,
And cooling both end portions in the width direction of the annular band,
Wherein the both end cooling step is performed in parallel with the film drying step. 12. The method of claim 11,
And a release direction determination step of determining whether or not the annular band is out of the one end side or the other end side in the width direction. 13. The method according to claim 11 or 12,
The both end cooling step and the film drying step are started simultaneously. delete delete delete delete delete delete delete

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