KR101316670B1 - Drying apparatus and solution film-forming method - Google Patents

Abstract

The band 91 consists of a strip | belt-shaped center part 91c and the strip | belt-shaped side part 91s arrange | positioned at the width direction both sides of the center part 91c. The weld part 91w of the center part 91c and the side part 91s is exposed from the surface 91a. The dope flows out from the outlet 133a toward the surface 91a of the band 91 in a moving state. On the surface 91a, the flexible film 136 which consists of dopes is formed so that the welding part 91w may be covered. Dry air is sent from the duct toward the flexible membrane 136. The solvent evaporates from the flexible membrane 136 by the contact with the dry wind. The nozzle 151 makes the heating wind 150 contact the welding part 91w from the back surface 91b side. The solvent evaporates from the flexible film on the surface 91a by the heating wind 150. The peeling roller peels the casting film 136 from the band 91 to make a film.

Description

Drying apparatus and solution film formation method {DRYING APPARATUS AND SOLUTION FILM-FORMING METHOD}

The present invention relates to a solution forming method and a drying apparatus used in the solution forming method.

With large screens of liquid crystal displays (LCDs), large areas are also required for optical films used in LCDs. The optical film is made long and then cut to a predetermined size to correspond to the LCD. Therefore, in order to manufacture a larger area optical film, it is necessary to manufacture a long optical film having a larger width than the conventional one.

As a typical manufacturing method of a long optical film, there exists a solution film formation method of a continuous system. As is well known, the solution film forming method is flexible on a flexible support on which a polymer moves dope dissolved in a solvent, thereby forming a flexible film made of dope on the flexible support, and peeling the flexible film from the flexible support to dry the film. It is a method of manufacturing.

A metal band is used as the flexible support, and the maximum width of the film that can be produced is constrained by the width of the band. Thus, larger width bands are needed to produce larger width films. However, so far, only bands up to 2m wide have been obtained.

Accordingly, in Korean Patent Publication No. 2009-0110082, a band having a larger width than the conventional one is obtained by welding a center band serving as the center portion in the width direction and a pair of side bands serving as the side portions of the band in the longitudinal direction. .

However, the welded portion of the side band and the center band is exposed on the surface of the band described in Korean Patent Laid-Open Publication No. 2009-0110082, and there are more defects such as pinholes in the welded portion than the side band and the center band. For this reason, peeling remainder failure occurs due to the defect of a weld part. When the peeling residue failure occurs, the production rate of the solution film is once reduced or stopped to remove the flexible film remaining on the flexible support. As a result, it becomes impossible to manufacture a film efficiently.

An object of the present invention is to provide a solution film forming method that can perform a film forming method using a wider band than the conventional one, and can efficiently produce a film, and a drying apparatus used for the solution film forming method.

In order to solve the said subject, the solution film forming method of this invention is equipped with a casting film formation step, a casting film drying step, a peeling step, and a film drying step. The flexible film formation step forms a flexible film which consists of said dope on the said surface by sending dope continuously to the surface of the moving band which moves to a longitudinal direction. The said dope contains a polymer and a solvent. The movable band is formed by welding a first metal sheet and a second metal sheet. The weld extending in the direction of movement of the movable band is exposed on the surface. The flexible film covers the welding portion. The said weld part is formed with the pinhole of 50 micrometers or more and less than 70 micrometers in diameter. In the casting film drying step, dry air is brought into contact with the casting film to evaporate the solvent from the casting film. A peeling step peels the said flexible film from a support body, and makes it a wet film. The film drying step evaporates the solvent from the wet film.

It is preferable that this solution film forming method further comprises a welding part heating step. The welding part heating step is performed between the film forming step and the peeling step. The welding part heating step heats the welding part from the back side of the moving band.

Moreover, the solution film forming method of this invention is equipped with a casting film formation step, a casting film drying step, a peeling step, a film drying step, and a welding part heating step. This flexible film formation step forms a flexible film which consists of said dope on the said surface by sending dope continuously to the surface of the moving band by which the 1st metal sheet and the 2nd metal sheet are welded. The said dope contains a polymer and a solvent. The movable band moves in the longitudinal direction. The weld extending in the direction of movement of the movable band is exposed on the surface. The flexible film covers the welding portion. In the casting film drying step, dry air is brought into contact with the casting film to evaporate the solvent from the casting film. A peeling step peels the said flexible film from a support body, and makes it a wet film. The film drying step evaporates the solvent from the wet film. The welding part heating step is performed between the flexible film forming step and the peeling step. The welding part heating step heats the welding part from the back side of the moving band.

The drying apparatus of this invention dries the casting film which consists of dope formed on the surface of the moving band which moves to a longitudinal direction. The said dope contains a polymer and a solvent. The drying apparatus includes a dry wind supply unit and a rear surface heating unit. The dry air supply unit makes the dry air contact the flexible membrane. The movable band is formed by welding a first metal sheet and a second metal sheet. The weld extending in the direction of movement of the movable band is exposed on the surface. The weld portion is covered with the flexible membrane. A back side heating part heats the said welding part from the back side of the said moving band.

It is preferable that the said back heating part is provided with the nozzle which makes a heating wind contact the said welding part.

It is preferable that the said moving band is formed in an annular shape, and circulates in the state which spread over the roller, and the casting die and the peeling roller are provided one by one from the upstream side in the said moving direction. The casting die causes the dope to flow out of the surface. The peeling roller peels the said flexible film from the said surface. It is preferable that the said back heating part is arrange | positioned between the said casting die and the said peeling roller in the said moving direction.

The said drying apparatus is especially effective when the pinhole of 50 micrometers-70 micrometers in diameter is formed in the said welding part.

According to the present invention, a wide elongated film can be efficiently produced than before.

The above objects and advantages will be readily understood by those skilled in the art by reading the detailed description of the preferred embodiments with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view which shows the outline | summary of the manufacturing equipment of the band of this invention.
2 is a plan view showing an outline of a band manufacturing facility.
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 a line VV in FIG. 4.
6 is an explanatory diagram of a weld bead and its surroundings.
7 is a schematic view of a taper roller.
8 is a schematic view of a clip.
9 is a schematic diagram of a band.
It is a side view which shows the outline | summary of a 1st solution film forming facility.
It is a top view which shows the outline | summary of a band.
It is a perspective view which shows the outline | summary of a back surface heating part.
It is sectional drawing which shows a mode that a back surface heating part heats a welding part.
It is a side view which shows the outline | summary of a 2nd solution film forming equipment.
It is a side view which shows the outline | summary of a 3rd solution film forming equipment.

The band manufacturing equipment 10 shown in FIG. 1 and FIG. 2 makes the long band member 13 which consists of the long center member 12 and the side member 11 provided in the width direction both sides of the center member 12. As shown in FIG.

The side member 11 and the center member 12 are each a sheet metal material. The side member 11 is a sheet member of a relatively narrow width narrow. It is preferable that the side member 11 and the center member 12 are formed of the same raw material, and it is more preferable to be formed through the same raw material and the formation process. For example, the side member 11 and the center member 12 are preferably all formed of stainless steel.

As the center member 12, you may use the band used as a conventional flexible support body. The center member 12 is wider than the side member 11, and the width of the center member 12 in this embodiment is constant in the range of 1500 mm or more and 2100 mm or less. The width of the side member 11 is constant in the range of 50 mm or more and 500 mm or less.

The band manufacturing facility 10 is provided with the sending part 16, the butting part 17, the welding unit 18, the heating part 19, and the winding device 20. As shown in FIG.

(Sending part)

The sending section 16 has a first sending device 23 for sending the side member 11 and a second sending device 24 for sending the central member 12. The sending part 16 sends the side member 11 and the center member 12 to the butt | matching part 17 independently, respectively. The side member 11 wound by roll shape is set to the 1st delivery apparatus 23. As shown in FIG. The first dispensing device 23 unwinds the side member 11 and sends it to the butt portion 17. The center member 12 wound by roll shape is set to the 2nd delivery apparatus 24. FIG. The second delivery device 24 unwinds the central member 12 and sends it to the butt portion 17.

The butting part 17 abuts the center member and the side member 11 which are guided independently so that the side edge 11e of the side member 11 and the side edge 12e of the center member 12 contact each other. The abutting part 17 preferably has a first roller 26, a second roller 27, a third roller 28, and a fourth roller 29. The 1st roller 26 and the 2nd roller 27 are sequentially arranged in the conveyance path with the center member 12 from an upstream side. The third roller 28 is disposed in the conveyance path of the side member 11. The 4th roller 29 is arrange | positioned at the conveyance path so that both the side member 11 and the center member 12 may be supported.

The abutting position Pc is a position where one side edge 11e of the side member 11 and one side edge 12e of the center member 12 start contact. The 4th roller 29 is a butt support roller which supports the side member 11 and the center member 12 which were sent in the butt position Pc.

The second roller 27 and the third roller 28 are such that the central member 12 and the side member 11 are in contact with the central member 12 and the side member 11 at the circumferential surface of the fourth roller 29. The conveyance path | route with and respectively are adjusted.

The 2nd roller 27 adjusts the conveyance path | route of the center member 12, and controls the passage path of the side edge 12e which should be welded with the side member 11 toward the butt position Pc. The second roller 27 is movable in the width direction Y of the center member 12. The shift mechanism 32 moves the second roller 27 in the width direction Y.

The position detecting means 34 is disposed between the second roller 27 and the fourth roller 29. The position detection means 34 detects one passage position in each side edge 12e of the center member 12, and sends a signal of the detected passage position to the controller 33. The controller 33 calculates the displacement amount of the second roller 27 in the width direction Y based on the signal of the passing position sent, and sends the displacement amount signal to the shift mechanism 32. The shift mechanism 32 changes the inclination of the second roller 27 and the position of the second roller 27 in the width direction Y of the central member 12 based on the signal of the displacement amount sent. In this way, the center member 12 is displaced in the width direction Y by changing the inclination and the position of the second roller 27.

It is preferable that the shift mechanism 37 is provided in the 1st roller 26. As shown in FIG. By this shift mechanism 37, the 1st roller 26 presses the center member 12 which faces the 2nd roller 27 from one member surface. The pressing pressure with respect to the center member 12 of the 1st roller 26 changes with the displacement amount of this 1st roller 26. FIG. In this way, the amount of displacement of the first roller 26 is controlled to adjust the pressing pressure. Thereby, the center member 12 wound up by the 2nd roller 27 can control the winding center angle. By control of this winding center angle, the displacement amount in the width direction Y of the center member 12 by the 2nd roller 27 can be controlled more precisely.

The 3rd roller 28 adjusts the conveyance path | route of the side member 11, and adjusts the passage path | route of one side edge 11e which should be welded with the center member 12 toward the butt position Pc. The third roller 28 is provided with a controller 38 for controlling the longitudinal direction. The third roller 28 is rotatable in the circumferential direction, and the rotation axis is at the center of the circular cross section. Therefore, the longitudinal direction of the third roller 28 coincides with the direction of the rotation axis. For example, the controller 38 changes the angle θ1 formed between the circumferential direction and the conveyance direction X of the central member 12 in the contact area while being in contact with the side member 11, The longitudinal direction of the third roller 28 is changed along the member surface of the side member 11.

As mentioned above, it is preferable to control so that the butted position Pc may be on the 4th roller 29 using the 1st roller 26-the 3rd roller 28. As shown in FIG. It is preferable that all the 1st roller 26-the 3rd roller 28 are drive rollers which rotate in a circumferential direction. By rotating in the circumferential direction, the first roller 26 and the second roller 27 also serve as conveying means of the central member 12. By rotating in the circumferential direction, the third roller 28 also acts as a conveying means of the side member 11. By using the 1st roller 26-the 3rd roller 28 as a drive roller, control of the conveyance path between the side member 11 and the center member 12 is performed more reliably. Along with this, on the first roller 26 to the third roller 28 of the side member 11 and the center member 12 by using the first roller 26 to the third roller 28 as a driving roller. This prevents slippage and prevents absorption on the member surface.

(Welding unit)

The side member 11 and the center member 12 are supplied to the welding unit 18 from the butting part 17 in the state which the side edge 11e, 12e of each other contacted. The welding unit 18 welds the supplied side member 11 and the center member 12 to each other. By continuously supplying from the butting part 17, the welding unit 18 can perform the length welding process which welds the side member 11 and the center member 12 to a longitudinal direction. The welding unit 18 has a welding device 42. As the welding apparatus 42, a laser welding apparatus is mentioned, for example. As the laser welding apparatus, for example, it may utilize the CO ₂ laser welding apparatus and, YAG laser welding device. In this 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 focused laser light, melts the side member 11 and the center member 12 by irradiating the laser light to the side member 11 and the center member 12 as the irradiation target. Bond. The welding device 42 includes a laser oscillator 43, a welding device body 46, and a gas supply part (not shown). The welding apparatus main body 46 collects and injects the laser beam guided from the laser oscillator 43. The gas supply part supplies CO ₂ gas when irradiating laser light. The CO ₂ gas prevents oxidation of the side member 11 and the central member 12. In addition, in FIG. 2, illustration of the laser oscillator 43 is abbreviate | omitted in order to avoid the trouble of drawing.

Instead of a laser welding device, a TIGsten (Tungsten Inert Gas welding) device may be used. As is well known, TIG welding is one of arc welding using an arc as a heat source. TIG welding is a kind of inner gas arc welding which uses an inert gas (inert gas) as a shield gas, and uses tungsten or a tungsten alloy for an electrode. Laser welding is more preferable than TIG welding. Moreover, it is good also as hybrid welding which combined TIG welding and laser welding.

The welding support roller 41 is provided in the conveyance path between the side member 11 and the center member 12 so as to face the exit port of the laser beam of the welding apparatus main body 46. The welding support roller 41 supports the side member 11 and the central member 12 in the circumferential surface. The axis of rotation of the welding support roller 41 is parallel to the width direction Y of the side member 11 and the center member 12. The side member 11 and the center member by the welding support roller 41 so that the laser beam is irradiated to the side member 11 and the center member 12 while being supported by the circumferential surface of the welding support roller 41 ( It is preferable to set the support position of 12). That is, it is preferable to perform welding on the welding support roller 41. Thereby, the side member 11 and the center member 12 are stabilized in the state which the side edge 11e, 12e contacted each other, and a laser beam can be reliably irradiated to the place which should be irradiated.

It is preferable that the welding apparatus main body 46 is equipped with the shift mechanism 50 for displacing in the width direction Y. The position detecting means 47 is provided upstream of the welding device 42. The position detecting means 47 detects the contact position Ps (see FIG. 5) where the side edge 11e of the side member 11 and the side edge 12e of the central member 12 contact each other, and detect the detected contact. The signal at the position Ps (see FIG. 5) is sent to the controller 51. The position detection means 47 should just be arrange | positioned in the vicinity of the conveyance path from the butt position Pc to the welding apparatus 42. FIG.

The controller 51 calculates the displacement amount of the welding apparatus main body 46 in the width direction Y based on the signal of the contact position Ps (refer FIG. 5) sent, and transmits the signal of the displacement amount to the shift mechanism 50. Send to When the signals of the conveyance speeds of the side member 11 and the center member 12 are input, the controller 51 transmits to the shift mechanism 50 the signal of the displacement amount which should displace the welding apparatus main body 46, and the signal of the timing which displaces it. send. The shift mechanism 50 changes the position of the welding apparatus main body 46 to a predetermined timing based on the signal of the displacement amount and the timing of the displacement sent. By changing the position of the welding apparatus main body 46 in the width direction Y in this way, the irradiation position of a laser beam is controlled more precisely, and the side member 11 and the center member 12 are welded more reliably. In addition, the conveyance speeds of the side member 11 and the center member 12 to the welding apparatus 42 in this embodiment are made into the range of 0.15 m / min or more and 20 m / min or less.

As shown in FIG. 1, the welding unit 18 is more preferably provided with a chamber 52 and a cleaning device 55. The chamber 52 partitions the welding apparatus main body 46 and the welding support roller 41 from the outer space. The cleaning device 55 cleans the gas. In addition, in FIG. 2, illustration of the chamber 52 and the cleaning apparatus 55 is abbreviate | omitted in order to avoid the trouble of drawing. The chamber 52 is provided with a 1st opening (not shown) which sends an internal gas to the outside, and a 2nd opening (not shown) which guides the gas cleaned | cleaned by the cleaning device 55 inside. The first opening and the second opening are respectively connected to the cleaning device 55. The internal gas of the chamber 52 is guided to the cleaning device 55 from the first opening. The cleaning device 55 purifies the gas guided from the chamber 52 and sends it to the chamber 52 through the second opening. In this way, the internal gas of the chamber 52 is circulated with the cleaning device 55.

By cleaning the internal gas of the chamber 52, the welding position Pw and its periphery are cleaned, and foreign matter etc. are mixed in the welding part 13w. In addition, by keeping the pressure inside the chamber 52 higher than the pressure in the external space, the inside of the chamber 52 can be maintained more reliably in a clean state. Further, by setting the welding position Pw to a position relatively high relative to the delivery section 16, the butting section 17, the heating section 19, and the winding device 20, it is possible to see that foreign matter is guided therefrom. It can prevent.

The cleanliness of the interior of the chamber 52 is preferably, for example, class 1000 or less in the US Federal Standard FED-STD-209D, and more preferably class 100 or less.

(Heating section)

The heating unit 19 is preferably installed downstream of the welding unit 18. The heating unit 19 is not particularly limited as long as it heats the weld 13w of the band member 13 obtained by welding so as to be within a constant temperature range. In the weld part 13w and its periphery, the stress resulting from the deformation which arose by welding may remain inside. The stress can be removed by heating such a weld part 13w or its periphery with the heating part 19. FIG. Even when the solution film forming method is performed continuously for a long time by removing this stress, deformation of the welded portion 13w can be suppressed.

The temperature of the welding part 13w by the heating of the heating part 19 will not be specifically limited if it is the temperature from which a stress is removed. However, when the band member 13 consists of stainless steel, for example, it is preferable that the temperature of the welding part 13w is 100 degreeC or more and 200 degrees C or less, and it is more preferable that they are 120 degreeC or more and 180 degrees C or less.

As the heating part 19, there are a ventilation means, for example. As shown in FIG. 1, the blowing means as the heating part 19 is a duct 56 which injects gas of a fixed temperature, and the blower 57 which sends this gas to the duct 56 after controlling the temperature of a gas is have. In addition, in FIG. 2, the illustration of the blower 57 is abbreviate | omitted in order to avoid the trouble of drawing.

The heating part 19 may be provided on the side opposite to the welding support roller 41 about FIG. 1 about the conveyance path of the band member 13, or may be provided on the same side as the welding support roller 41. FIG.

The band member 13 from which stress was removed is sent to the winding-up apparatus 20 downstream of the heating part 19, and wound up in roll shape. A winding core for winding the band member 13 is set in the winding device 20. The winding device 20 is provided with a drive means for rotating the winding core in the circumferential direction.

The winding device 20 also functions as welding tension control means for controlling the tension of the band member 13, the side member 11, and the center member 12 in the welding position Pw. Therefore, it is preferable to control the torque of the winding apparatus 20 so that the tension | tensile_strength of the band member 13, the side member 11, and the center member 12 in the welding position Pw is kept constant. Thereby, the welding part 13w can be made constant in the longitudinal direction.

When starting welding, it is preferable to carry out as follows using the winding apparatus 20, for example. First, the side member 11 and the center member 12 are set on the conveyance path from the delivery section 16 to the winding apparatus 20, and the respective ends of the side member 11 and the center member 12 are wound up ( Wind it up with winding feeling of 20). Winding of the side member 11 and the center member 12 is started. Winding is started and the conveyance path | route of the side member 11 and the center member 12 is controlled, and the joining position Pc is hold | maintained at a predetermined position. After the abutment position Pc of the side member 11 and the center member 12 is kept constant, welding is started by the welding apparatus 42. FIG.

(Shift prevention)

It is preferable to perform welding, suppressing the positional shift of the side member 11, the center member 12, and the band member 13. As shown in FIG. For example, instead of the welding unit 18, you may use the welding unit 61 as shown in FIG. 3 and FIG. 4 provided with a pressurization apparatus. The welding unit 61 further includes a pressurizing device 62 in the welding unit 18 shown in FIGS. 1 and 2. Although the welding unit 61 is equipped with the shift mechanism 50, the controller 51, the chamber 52, and the cleaning apparatus 55 similarly to the welding unit 18, in order to avoid the trouble of illustration, FIG. 3 and FIG. This illustration is omitted at 4. In addition, about the apparatus and member similar to FIG. 1 and FIG. 2, the same code | symbol as FIG. 1 and FIG. 2 is attached | subjected, and description is abbreviate | omitted. In the welding unit 61, the chamber 52 surrounds the pressurizing device 62 and the welding support roller 41 so as to partition the external space.

The pressurizing device 62 suppresses the positional shift of the side member 11, the center member 12, and the band member 13 in the welding position Pw. The pressurizing device 62 is a side member 11 and a center member 12 and a band member 13 on the welding support roller 41 by a pair of belts composed of a first belt 63 and a second belt 64. Press).

The first belt 63 and the second belt 64 are endless belts formed in an annular shape. The first belt 63 and the second belt 64 are parallel to the circumferential surfaces of the fifth roller 67 to the seventh roller 69 in the respective longitudinal directions of the fifth roller 67 to the seventh roller 69. To be wound. At least one of the fifth rollers 67 to seventh rollers 69 is a driving roller that rotates in the circumferential direction. By rotation of this drive roller, the 1st belt 63 and the 2nd belt 64 are conveyed, maintaining the conveyance path parallel to each other.

The fifth rollers 67 to seventh rollers 69 are disposed such that the rotating shaft is parallel to the rotating shaft of the welding support roller 41.

The fifth rollers 67 to seventh rollers 69 include the side where the fourth roller 29 and the welding support roller 41 are disposed on the conveying path between the side member 11 and the center member 12. Is arranged in the region on the opposite side. The fifth roller 67 is provided so as to face the conveyance path between the side member 11 and the center member 12 that face the welding support roller 41 from the fourth roller 29. The sixth roller 68 is provided so as to face the conveyance path between the side member 11 and the center member 12 that face the heating portion 19 from the welding support roller 41. The seventh roller 69 is appropriately arranged to determine the conveyance path between the first belt 63 and the second belt 64 facing the sixth roller 68 from the sixth roller 68.

As for the 5th roller 67 and the 6th roller 68, the 1st belt 63 and the 2nd belt 64 which face the 6th roller 68 from the 5th roller 67, the welding support roller 41 It is arrange | positioned so that it may convey so that the upper side member 11, the center member 12, and the band member 13 may be pressed. For example, when welding the side member 11 and the center member 12 on the welding support roller 41 from above, each of the fifth roller 67 and the sixth roller 68 has a lower end of the welding support roller ( It is arranged to be a position lower than the upper end of 41).

The 5th roller 67 and the 6th roller 68 are conveyed with the side part 13s of the band member 13 by which the conveyance path of the 1st belt 63 is formed by the side member 11 and the side member 11 ,. It is installed to face the furnace. In addition, in the fifth roller 67 and the sixth roller 68, the center portion 13c of the band member 13 in which the conveyance path of the second belt 64 is formed of the central member 12 and the central member 12 is formed. It is provided so as to oppose the conveyance path of a. Thereby, the 1st belt 63 presses the side member 11 and the side part 13s to the welding support roller 41, and the 2nd belt 64 welds the center member 12 and the center part 13c. It presses against the support roller 41.

As mentioned above, the 1st belt 63 and the 2nd belt 64 are respectively provided in opposition to the welding support roller 41, and the side member 11 and the center member 12 in the welding position Pw are respectively provided. ) To the same height. The height of the side member 11 and the center member 12 is the height of the surface of each member 11 and 12. By pressing the side member 11 and the center member 12 to perform the welding in this state so that the height is the same, the aspect of the welded portion 13w becomes more uniform in the longitudinal direction, and the welding can be performed more reliably. Can be.

5 and 6, the length welding process will be described in more detail. The 1st belt 63 and the 2nd belt 64 are conveyed in the state separated from each other. The conveyance path is set so that the welding position Pw of the 1st belt and the 2nd belt 64 may pass through the clearance gap between the 1st belt 63 and the 2nd belt 64. As shown in FIG. Thereby, the contact position Ps which the side edge 11e of the side member 11 and the side edge 12e of the center member 12 contact | connects is 1st belt 63 and 2nd as shown in FIG. It passes through the clearance with the belt 64, and is welded between the 1st belt 63 and the 2nd belt 64. As shown in FIG. In addition, illustration of the welding apparatus main body 46 is abbreviate | omitted in FIG.

It is preferable to make the space | interval D1 of the 1st belt 63 and the 2nd belt 64 into the 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 contact position Ps and the second The distance D3 from the belt 64 is preferably in the range of 3 mm or more and less than 6 mm, respectively.

Instead of the pressurizing device 62, a roller (not shown) having a rotating shaft parallel to the rotating shaft of the welding support roller 41 may be disposed upstream and downstream of the welding device main body 46, respectively. In this case, the side member 11 in the welding position Pw is pressed by pressing the side member 11 and the center member 12 with the upstream one roller, and pressing the band member 13 with the other roller downstream. 11) and the center member 12 can be pressed.

As shown in FIG. 6, the contact position Ps and its periphery are melt | dissolved by the heat of the welding apparatus 42, and the welding bead 72 is formed. Heat is transmitted from the welding bead 72 to both sides, so that each of the side member 11 and the center member 12 has a heat affected area 73 which is affected by heat in the welding. This heat affected zone 73 may be immediately or over time different from other zones not affected by heat. For example, when a wide support is used as the flexible support, a problem such as deformation of the weld portion 13w or foaming of the flexible film occurs when the solution film forming method is continuously performed for a long time.

Therefore, as shown in FIG. 5, the high heat | fever which consists of a material whose heat conductivity is higher than the side member 11 and the center member 12 in the passage area | region which passes the contact position Ps among the peripheral surfaces of the welding support roller 41 is shown. It is preferable that the conductive portion 71 is formed. Thereby, the heat from the welding apparatus 42 (refer FIG. 3, FIG. 4) can be spread | diffused more quickly. Even if the width of the heat affected area 73 of the side member 11 and the center member 12 is made smaller or the depth of the heat affected area 73 is made shallower in order to diffuse the heat on the welding support roller 41 side more quickly. do.

It is preferable that the width | variety D4 of the passage area | region used as the high thermal conductivity part 71 is the range of 26 mm or more and 32 mm or less.

In addition, it is more preferable that a high thermal conductive portion made of a material having a higher thermal conductivity than the side member 11 and the center member 12 is formed on both surfaces of the first belt 63 and the second belt 64. Thereby, the magnitude | size of the heat affected area | region 73 can be made small 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 of being in close contact with each other so that the gap becomes 0 (zero) at the contact position Ps. Therefore, it is preferable that the side member 11 and the center member 12 are previously formed in the shape which does not produce a gap when abutting each edge 11e and 12e. Thereby, the band member 13 without a space | gap in a welding part can be manufactured more reliably.

The said length welding process may be only the continuous welding process of welding continuously in the longitudinal direction of the side member 11 and the center member 12, In addition, you may implement the intermittent welding process which performs welding intermittently. When welding intermittently, the side member 11 and the center member 12 which are continuously sent to the welding apparatus 42 are welded intermittently. It is preferable to perform such an interruption welding process before a continuous welding process. In this case, the side member 11 and the center member 12 may be temporarily joined in the intermittent welding step, and then the joint may be joined over the entire longitudinal direction in the continuous welding step.

In the case of temporary welding in an intermittent welding process, and then joining in a continuous welding process, the side member 11 and the center member 12 from the butt portion 17 (see FIGS. 1 and 2) to the welding unit 18. Guide and weld intermittently. In addition, when the surface corresponding to the flexible surface and the back surface corresponding to the non-flexible surface when the side member 11 and the center member 12 are used as a later flexible support body are set, welding in an intermittent welding process is performed with respect to the back surface. It is preferable to carry out. Therefore, the side member 11 and the center member 12 are conveyed so that the back surface may face the welding apparatus main body 46 (refer FIG. 1).

After performing an intermittent welding process, the temporary joining side member 11 and the center member 12 are guided to the winding apparatus 20, and are wound up. In addition, you may heat with the heating part 19 with respect to a welding part before winding up. The provisional joint member (not shown) which consists of the side member 11 and the center member 12 wound up through the intermittent welding process is unwound by a delivery device (not shown), and is sent back to the welding unit 18. This feeding is performed so that the surface of the tack welding member passes through the welding apparatus main body 46 (refer FIG. 1). In the welding unit 18, continuous welding is performed and the band member 13 is obtained. In addition, instead of this method, two welding units 18 are arranged side by side relatively upstream and downstream, and intermittent welding is performed by one upstream welding unit 18, and continuous by the other welding unit 18 downstream. You may perform welding.

When welding is performed, the welding bead 72 may be formed more convexly than the side member 11 and the center member 12. Therefore, the groove | channel 76 is formed in the welding support roller 41 used when performing the 1st process of welding one surface in the longitudinal direction as above, and the 2nd process of welding the other surface in the longitudinal direction. It is preferable that it is done. As shown in FIG. 5, the groove 76 is formed in a passage region through which the contact position Ps passes among the peripheral surfaces of the welding support roller 41. What is necessary is just to convey the side member 11 and the center member 12, and to perform a 2nd process so that the welding part formed by the welding bead 72 which convexed in the 1st process may pass through this groove | channel 76. Thereby, the band member 13 which is more smooth and has less residual stress can be obtained. Therefore, even if it is used as a solution film, the film | membrane which has less deformation | transformation and property change in the band as a flexible support body does not foam, and a flexible film can be produced more reliably.

It is preferable that the width | variety D5 of the groove | channel 76 is the range of 6 mm or more and 12 mm or less, and the depth D6 of the groove | channel should just be about 1 mm.

In the above embodiment, the 3rd roller 28 is used as a means to adjust the conveyance path | route of the side member 11 in the butt | matching part 17. FIG. However, you may use the taper roller 81 as shown in FIG. 7 instead of the 3rd roller 28. The tapered roller 81 is a roller having a circular cross section formed so that the diameter d continuously decreases from one end to the other end. The diameter d continuously decreases at a constant rate from one end to the other end. The taper roller 81 is arrange | positioned so that one end with a large diameter d may face the conveyance path with the center member 12, and the other end with a small diameter d may face the opposite side to the center member 12. As shown in FIG.

By being in contact with the taper roller 81, the conveyed side member 11 changes the conveying path in the direction of the arrow line A toward the central member 12, and comes close to the central member 12. . Thereby, the side member 11 is reliably conveyed toward the abutting position Pc (refer FIG. 1, FIG. 2).

It is preferable that the taper roller 81 is provided with the drive means 82 which rotates in a circumferential direction. The rotating shaft is formed by inserting the center of one end face and the center of the other end face. By conveying the side member 11 by the taper roller 81 which rotates by the drive means 82, a side member becomes closer to the center member 12 more effectively.

Instead of the third roller 28, a clip 85 as a gripping means as shown in FIG. 8 may be used. The clip 85 is provided with the U-shaped clip main body 86 and the pair of clamping pins 87 provided in each front-end | tip part of the clip main body 86, and clamps the side member 11. The pinching pin 87 is provided to be movable between a pinching position for pinching the side member 11 and a retracting position for retracting from the pinching position. The clip 85 is provided with the movement mechanism 88, and is movable between the holding start position which starts holding | grip and the holding | release release position which releases a holding | gripping. In addition, the clip 85 can be moved also in the width direction Y. FIG.

The clip 85 grips the side member 11 by moving the gripping pin 87 to the gripping position at the gripping start position. The clip 85 conveys downstream, nearing the width direction toward the center member 12 in a state where the side member 11 is held.

The taper roller 81 and the clip 85 may be used to bring the side member 11 closer to the center member 12, and may also be used to bring the center member 12 closer to the side member 11. In this case, what is necessary is just to support or convey the center member 12 with the taper roller 81 and the clip 85.

In the said embodiment, although the both side member 11 is welded to the center member 12 simultaneously, after welding one side member 11 to the center member 12, the other side member 11 is center member 12, and is welded. ) May be welded.

(band)

As shown in FIG. 9, the band 91 used as a flexible support body is an annular endless band. The band 91 is made by welding one end and the other end in the longitudinal direction of the band member 13. In addition, the band member 13 for making the band 91 may be cut to a predetermined length, and the band member 13 may be made of the side member 11 and the center member 12 cut in advance to a predetermined length. In this case, the band 91 may be made as it is without cutting.

It is preferable to cut the band member 13 in the direction crossing the width direction Y. As shown in FIG. As for the direction of a cut, it is more preferable to cut so that the angle | corner with the width direction Y may become 5 degrees or more and 15 degrees or less in general. The annular band 91 is formed by welding one tip and the other in the longitudinal direction of the cut band member 13 in this manner. The angle (theta) 2 which the weld part 91v which welded the one end part and the other end part, and the width direction Y is made into the range of 5 degrees or more and 15 degrees or less generally. Thus, in the annular welding process which makes the elongate band member 13 annular, the welding apparatus 42 used in the length welding process may be used, and other well-known welding apparatus may be used.

The band 91 manufactured by welding has a side portion 91s formed of the side member 11 (see FIGS. 1 to 8) and a central portion 91c formed of the central member 12 (see FIGS. 1 to 8). Is made of. The weld part 91w of the side part 91s and the center part 91c is exposed to the surface 91a or the back surface 91b. The weld portion 91w is a substantial portion of the weld portion 13w. It is preferable that the linear weld part 91w is provided so that it may become parallel to the longitudinal direction of the band 91. FIG. The width of the band 91 obtained in this way is 2000 mm or more and 3000 mm or less.

The obtained band 91 is used for a solution film forming facility after the surface is polished to a mirror surface. The method of manufacturing a film using the band 91 is described below. The kind of polymer is not specifically limited, You may use the well-known polymer which can be made into a film by a solution film. In the following embodiment, the case where cellulose acylate is used as a polymer is demonstrated as an example.

(Solution film production facility)

As shown in FIG. 10 and FIG. 11, the solution film forming facility 110 includes a film forming apparatus 117, a first tenter 120, a roller drying apparatus 124, a second tenter 125, and a slitter. The rotor 126 and the winding device 127 are provided sequentially from the upstream side. The film forming apparatus 117 forms the film 116 by the dope 113 which the cellulose acylate 111 melt | dissolved in the solvent 112. The first tenter 120 advances drying while supporting each side of the film 116 with the support means 119. The roller drying apparatus 124 dries, supporting the film 116 with the plurality of rollers 122. The second tenter 125 supports each side of the film 116 with a supporting means to impart a tension in the width direction to the film 116. The slitter 126 ablates the support marks of each side supported by the supporting means of the second tenter 125. The winding device 127 winds the film 116 around a winding core to make a roll shape.

(Film forming device)

The film forming apparatus 117 is provided with a pair of rollers 131 and 132 rotating in the circumferential direction. The pair of rollers 131 and 132 are arranged horizontally, and the band 91 is wound around the roller 131 and the circumferential surface of the roller 132. At least any one of the rollers 131 and 132 should just be a drive roller which has a drive means.

The rollers 131 and 132 are provided with a first controller (not shown) and a second controller (not shown) for controlling the circumferential surface temperature to a predetermined temperature, respectively.

In the film forming apparatus 117, the flexible die 133 which flows out the dope 113 from the upstream side to the downstream side in the moving direction of the band 91, the film drying apparatus, and the peeling roller 135 are sequentially Is installed.

(Flexible die)

The casting die 133 is disposed at a position above the band 91 and is directly above the one roller 131. However, the flexible die 133 may be disposed between one roller 131 and the other roller 132 instead of just above one roller 131. In addition, when arrange | positioning the flexible die 133 between one roller 131 and the other roller 132, the roller (not shown) is placed in the position which opposes the flexible die 133 via the band 91. You may arrange | position and support the band 91 by this roller.

The flexible die 133 is disposed so that the outlet 133a for outflowing the dope 113 faces the surface 91a of the band 91. The slit-shaped outlet port 133a is formed so as to oppose the whole width direction of the surface 91a, ie, one side portion 91s, the center portion 91c, and the other side portion 91s.

Moreover, the upstream side of the casting die 133 in the moving direction of the band 91 is a pressure reduction chamber which depressurizes the dope 113 which extends from the casting die 133 to the band 91, and what is called an upstream side of the bead. It may be installed in. As a result, vibration of the beads caused by the accompanying wind can be suppressed, and thickness irregularity can be prevented. In addition, the companion wind is generated in the vicinity of the surface 91a according to the movement of the band 91, and refers to the wind flowing in the moving direction of the band 91.

(Film drying device)

The film drying apparatus has a first duct 141 to a third duct 143 and a back surface heating part 144.

(duct)

The first duct 141 to the third duct 143 send dry air toward the flexible membrane 136. The first duct 141 to the third duct 143 are sequentially disposed from the upstream side along the moving path of the band 91. The first duct 141 is provided above the rollers 131 and 132. The third duct 143 is provided below the rollers 131 and 132. The second duct 142 is installed between the first duct 141 and the third duct 143.

The first to third ducts 141 to 143 are respectively connected to a blower (not shown). A blower controller (not shown) for independently controlling the temperature, humidity, and flow rate of the gas supplied to each of the first to third ducts 141 to 143 is connected to the blower. In the first to third ducts 141 to 143, a discharge port for sending gas supplied from the blower as dry air is provided. The discharge ports provided in the first to third ducts 141 to 143 are formed to face the entire surface 91a, namely, one side portion 91s, the central portion 91c, and the other side portion 91s.

The outlets provided in the first duct 141 to the third duct 143 are formed in a slit shape and extend in the width direction of the band 91. The length of each outflow port in the width direction of the band 91 should just be that dry air touches the whole flexible film 136. As shown in FIG.

It is preferable that the temperature of a drying wind becomes high as it goes to the downstream side from the upstream of the movement path of the band 91. It is preferable that the temperature of the drying wind from the 1st duct 141 is 50 degreeC or more and 140 degrees C or less, It is preferable that the temperature of the drying wind from the 2nd duct 142 is 50 degreeC or more and 140 degrees C or less, and the 3rd duct 143 It is preferable that the temperature of the drying wind from is 40 degreeC or more and 100 degrees C or less.

(Back side heating part)

The back heating unit 144 is installed between the roller 131 and the roller 132. As shown in FIG.12 and FIG.13, the back surface heating part 144 is equipped with the nozzle 151 which sends the heating wind 150. FIG. The nozzle 151 is disposed on the rear surface 91b side of the band 91 so as to face the weld portion 91w. When the heating wind 150 sent out from the nozzle 151 touches the weld portion 91w, the weld portion 91w is heated.

The nozzle 151 is preferably arranged in the direction of movement of the band 91. In the case where the band 91 has a plurality of welding portions 91w, it is preferable to provide the nozzle 151 so that the heating wind 150 touches all the welding portions 91w.

Although the temperature of the heating wind 150 is not specifically limited, For example, it is preferable that they are 40 degreeC or more and 70 degrees C or less.

(move)

Returning to FIG. 10, a blower (not shown) may be disposed in the transport path between the film forming apparatus 117 and the first tenter 120. Drying of the film 116 is advanced by blowing from this blower.

(1st tenter)

The first tenter 120 extends the width of the film 116 by applying tension in the width direction while supporting the both side edge portions of the film 116 by the clip 110 and conveying it in the longitudinal direction. The preliminary area, the drawing area, and the relaxation area are formed in the first tenter 120 in order from the upstream side. In addition, the relaxation area may be omitted.

The first tenter 120 has a pair of rails (not shown) and a chain (not shown). Rails are provided on both sides of the conveyance path of the film 116, and a pair of rails are spaced apart at predetermined intervals. This rail spacing is constant in the preheating area, gradually widens downward in the stretching area, and is constant in the relaxation area. Moreover, you may make it become narrow gradually as the rail space | interval of a relaxation area faces downstream.

The chain is mounted so as to be movable along the rail across a prime sprocket and a driven sprocket (not shown). The plurality of supporting means 119 is attached to the chain at predetermined intervals. The support means 119 circulates along the rail by the rotation of the prime sprocket.

The support means 119 starts the support of the guided film 116 near the inlet of the first tenter 120, moves toward the outlet, and releases the support near the outlet. The support means 119 which release | released support moves to the vicinity of an entrance again, and supports the newly guided film 116. FIG.

The duct 155 is provided above the conveyance path of the film 116. The duct 155 has a slit for sending dry air and is supplied from a blower (not shown). The blower sends the drying air adjusted to a predetermined temperature or humidity to the duct 155. The duct 155 is disposed so that the slits face the conveying path of the film 116. Each slit is a shape extended in the width direction of the film 116, and is formed with predetermined space | interval mutually in the conveyance direction. In addition, you may provide the duct 155 below instead of the upper direction of the conveyance path of the film 116. Alternatively, the duct 155 may be provided both above and below the conveyance path of the film 116.

In this 1st tenter 120, while a film is conveyed, drying can advance with the drying wind from the duct 155, and the width | variety can be changed by the support means 119 at predetermined timing.

The solvent content rate of the film 116 in an extending | stretching area is 2 mass% D.B. (Dry Base) or more and 250 mass% D.B. It is preferable that it is the following and 2 mass% D.B. 100 mass% or more D.B. It is more preferable that it is the following. Elongation rate ER1 (= {(width after extending | stretching) / (width before extending | stretching)) * 100) in an extending | stretching process is more than 100%, and it is preferable that it is 140% or less. It is preferable that the temperature of the film 116 in an extending | stretching process is 95 degreeC or more and 150 degrees C or less.

In addition, in this specification, a solvent content rate (unit; mass% DB) is a dry-value reference value, Specifically, when making x the mass of a solvent and y the mass of the film 116, it is {x / (yx) } This value is obtained by × 100.

(Roller drying device)

The atmosphere inside the roller drying apparatus 124 is controlled by the air conditioner which temperature, humidity, etc. are not shown in figure. Many rollers 122 are provided in the roller drying apparatus 124, and the film 116 is wound up and conveyed by these. In the roller drying apparatus 124, the solvent is evaporated from the film 116. In the roller drying apparatus 124, a solvent content rate is 5 mass%. It is preferable to perform a drying process until it becomes below.

In addition, when the film 116 which came out from the roller drying apparatus 124 is curled, the curl correction apparatus which flattens the curl and straightens the film 116 between the roller drying apparatus 124 and the 2nd tenter 125. (Not shown) may be provided.

(Second tenter)

The second tenter 125 stretches the film 116. This stretching becomes a film 116 having desired optical properties. The film 116 obtained can be used as a retardation film. The second tenter 125 has the same structure as the first tenter 120. Moreover, the duct 157 provided in the 2nd tenter 125 flows toward the film 116 from the slit (not shown), outflowing the drying air heated at predetermined temperature.

The elongation rate ER2 (= {(width after stretching) / (width before stretching)) × 100) in the stretching in the second tenter 125 is preferably greater than 105% and 200% or less, and 110% or more 160 It is more preferable that it is% or less. The solvent content rate of the film 116 at the time of extending | stretching start is 5 mass% D.B. It is preferable that it is the following and it is 3 mass% D.B. It is more preferable that it is the following. It is preferable that the temperature of the film 116 in extending | stretching is 100 degreeC or more and 200 degrees C or less.

The second tenter 125 may be omitted depending on the optical properties of the film 116 to be manufactured.

The slitter 126 downstream of the second tenter 125 is supported by the supporting means 119 and 158 of the first tenter 120 or the second tenter 125 when the film 116 is guided. Excision of the side, including. The film 116 which cut out the side part is sent to the winding-up apparatus 127, and is wound up in roll shape.

A cooling device (not shown) may be provided between the second tenter 125 and the slitter 126 to cool and lower the film 116 from the second tenter 125.

Next, the operation of the present invention will be described.

The band 91 circulates in the longitudinal direction by the rotation of the drive roller. The casting die 133 continuously flows the dope 113 onto the surface 91a of the band 91. The dope 113 is flexible on the band 91. As a result, the flexible film 136 is formed on the band 91 so that the welding part 91w exposed to the surface 91a may be covered.

The first to third ducts 141 to 143 send dry air toward the flexible membrane 136 from the outlet. When dry wind touches the flexible membrane 136 from the 1st duct-the 3rd duct 141-143, a solvent evaporates from the flexible membrane 136.

The flexible film 136 which became the grade which can be conveyed to the 1st tenter 120 by evaporation of a solvent is peeled off from the band 91 in the state containing a solvent. At the time of peeling, the film 116 is supported by a peeling roller (hereinafter referred to as a peeling roller) 137, and the peeling position at which the flexible film 136 is peeled off from the band 91 is kept constant. In addition, the peeling roller 135 may be a drive roller provided with a drive means and rotating in a circumferential direction. The exfoliated flexible film 136, that is, the film 116, is guided to the first tenter 120.

The flexible film 136 peeled by the peeling roller 135 is formed so that the welding part 91w provided in the band 91 may be covered. However, the weld part 91w of the surface 91a has more defects, such as a pinhole, compared with another part. For this reason, in the flexible film 136, the part on the weld part 91w is easy to produce peeling remainder due to presence of a defect.

As shown in FIG. 12, in this invention, since the welding part 91w is heated from the back surface 91b side before peeling of the flexible film 136, drying of the part on the welding part 91w fully advances. Thus, according to this invention, it becomes possible to peel the casting film 136 from the peeling roller 135, suppressing the peeling remainder resulting from a defect.

The welding portion 91w includes a pinhole. The present invention can also be applied to the case where the weld hole 91w includes a pinhole having a diameter of 50 µm or more and less than 70 µm. For example, it is preferable that the pinholes of 50 micrometers or more and less than 70 micrometers are 5 pieces / m or less in the weld part 91w, and it is more preferable that the pinholes of 50 micrometers or more and less than 70 micrometers are 1 / mm or less. Here, "open / m" is the number of pinholes included in the weld portion 91w in the range of 1 m in the longitudinal direction of the band 91, and "open / m" is in the range of 1 mm in the longitudinal direction of the band 91. This is the number of pinholes included in the weld portion 91w. In addition, it is preferable that pinholes 70 micrometers or more in diameter do not exist in the weld part 91w.

In the said embodiment, drying of the flexible film 136 by the back surface heating part 144 is performed simultaneously with drying of the flexible film 136 by dry wind. However, this invention is not limited to this, You may change the drying of the flexible film 136 by the back surface heating part 144, and the drying of the flexible film 136 by dry wind.

In the present embodiment, the back heating unit 144 is provided to face the third duct 143 via the band 91. However, the present invention is not limited to this, and the rear heating unit 144 may be provided to face the first duct 141 through the band 91. Moreover, you may provide the heating part which heats the welding part 91w from the back surface 91b side in the part which contact | connects the welding part 91w among the rollers 132. As shown in FIG.

In addition, from the viewpoint of preventing foaming, drying of the flexible membrane 136 by the back heating unit 144 is performed at a time point when drying has progressed to some extent, that is, the back heating unit 144 is opposed to the third duct 143. It is preferable to install. As for the drying by the back surface heating part 144, a solvent content rate is 30 mass%. 100 mass% or more D.B. It is preferable to perform about the flexible film 136 of the following ranges.

In the said embodiment, although the width | variety of the center member 12 was made wider than the width | variety of the side member 11, this invention is not limited to this, The width | variety of the center member 12 is equal to the width of the side member 11, or Or it may be narrower than the width of the side member 11. The number of constituent members (center member or side member) constituting the band 91 is not limited to three, but may be two or four or more.

In the said embodiment, although the heating was performed from the back surface 91b side with respect to the welding part 91w parallel to a moving direction, this invention is not limited to this, but from the back surface 91b side with respect to the welding part which crosses a moving direction. You may heat.

(Condensation drying)

In order to dry the casting film 136, although the film drying apparatus containing the 1st-3rd ducts 141-143 was used in this embodiment, this invention is not limited to this, You may use other drying means. As another drying means, there exists a drying means including a condenser, for example, You may replace or add this to the drying means containing the 1st-3rd ducts 141-143.

(Wind blocker)

As shown in FIG. 14 and FIG. 15, a pair of wind shield plates 170 may be provided between the first duct 141 and the side portions 91s. The wind shield plate 170 installed in the moving direction of the band 91 is disposed in an upright position. Since the wind blocking plate 170 can prevent the drying wind from the first duct 141 from touching the side portion 91s of the band 91, the deformation of the side portion 91s due to the heating of the drying wind can be prevented. The deformation of the side portion 91s includes, for example, the side portion 91s floating up from the rollers 131 and 132.

In addition, the pair of wind shield plates 170 may be provided between the second duct 142 and the side portion 91s or between the third duct 143 and the side portion 91s.

(Press roller)

It is preferable to provide a pair of rollers 147 on the upstream side of the contact start position at which the dope 113 from the casting die 133 starts to contact the band 91. The pair of rollers 147 are arranged to nip the side portions 91s together with the rollers 131. Similarly, it is preferable that a pair of roller 165 is arrange | positioned also in the downstream side of a contact start position. The side parts 91s can be pressed by these rollers 147 and 165, and the rise of the side parts 91s at the time of dope casting can be prevented more reliably.

The rollers 147 and 165 are preferably drive rollers rotating by the drive means. The rollers 147 and 165 are preferably wound at the same speed as the conveyance speed of the band 91. As a result, the occurrence of frictional heat of the side portions 91s due to the contact between the band 91 and the roller 147 and the contact between the band 91 and the roller 165 can be suppressed, and deformation of the side portions 91s can be suppressed. It can be prevented more certainly.

In this embodiment, although the pair of rollers 147 and 165 are arrange | positioned at both the upstream and downstream of a contact position, either upstream and downstream may be sufficient. That is, the sun which uses any one roller pair among the pair of rollers 147 and the pair of rollers 165 may be sufficient.

(Polymer)

The polymer which can be used for this invention will not be specifically limited if it is a thermoplastic resin, For example, a cellulose acylate (111), a lactone ring containing polymer, a cyclic olefin, a polycarbonate etc. are mentioned. Among them, preferred are cellulose acylate and cyclic olefin, and preferred among them are cellulose acylate including acetate group and propionate group and cyclic olefin obtained by addition polymerization.

(Cellulose acylate)

As cellulose acylate 111, it is preferable that substitution degree of the acyl group to the hydroxyl group of a cellulose satisfy | fills following formula (I)-(III). In following formula (I)-(III), A and B show the substitution degree of the acyl group with respect to the hydrogen atom in the hydroxyl group of a cellulose, A is the substitution degree of an acetyl group, B is the acyl group of 3-22 carbon atoms It is substitution degree of. It is preferable that 90 mass% or more of cellulose acylate is 0.1-4 mm particle | grains. Especially, this invention has a big effect especially when cellulose diacetate (DAC) is used as a cellulose acylate.

(I) 2.0≤A + B≤3.0

(II) 0≤A≤3.0

(III) 0≤B≤2.9

The glucose units bound to β-1,4 constituting cellulose have free hydroxyl groups in second, third and sixth positions. Cellulose acylate is a polymer (polymer) in which some or all of these hydroxyl groups are esterified by acyl groups having 2 or more carbon atoms. Acyl substitution degree means the ratio (the substitution degree 1 is the case of 100% esterification) in which the hydroxyl group of a cellulose is esterifying about 2nd, 3rd, and 6th positions, respectively.

As for the total acylation substitution degree, ie, the value of DS2 + DS3 + DS6, 2.00-3.00 are preferable, More preferably, it is 2.22-2.90, Especially preferably, it is 2.40-2.88. In addition, the value of DS6 / (DS2 + DS3 + DS6) is preferably 0.28, more preferably 0.30 or more, and particularly preferably 0.31 to 0.34. Here, DS2 is a ratio where hydrogen of the 2nd hydroxyl group in a glucose unit is substituted by the acyl group (henceforth "acyl substitution degree of 2nd position"), and DS3 is the 3rd hydroxyl group of a glucose unit. The hydrogen is substituted by an acyl group (hereinafter referred to as "the degree of acyl substitution at 3rd position"), and DS6 is a ratio where hydrogen of the 6th hydroxyl group is substituted by an acyl group in the glucose unit (hereinafter referred to as "6th position). Is also referred to as "acyl substitution degree".

Only one kind of acyl group may be used for the cellulose acylate of the present invention, or two or more kinds of acyl groups may be used. When using two or more types of acyl groups, it is preferable that one is an acetyl group. The sum total of the degree to which the 2nd, 3rd, and 6th hydroxyl groups are substituted by the acetyl group is made into DSA, and the sum of the degree to which the 2nd, 3rd and 6th hydroxyl groups are substituted by the acyl groups other than an acetyl group When it is set as DSB, it is preferable that the value of DSA + DSB is 2.22-2.90, Especially preferably, it is 2.40-2.88.

Moreover, it is preferable that DSB is 0.30 or more, Especially preferably, it is 0.7 or more. Moreover, it is preferable that 20% or more of DSB is a substituent of the hydroxyl group of a 6th position, More preferably, it is 25% or more, More preferably, 30% or more, It is preferable that it is especially 33% or more. Moreover, the value of DSA + DSB in the 6th position of a cellulose acylate is 0.75 or more, More preferably, it is 0.80 or more, Especially the cellulose acylate which is 0.85 or more is also preferable, By using such a cellulose acylate, it is more excellent in solubility. You can make dope. In particular, when a non-chlorinated organic solvent is used, a dope having excellent solubility, low viscosity and excellent filterability can be produced.

The cellulose which is a raw material of cellulose acylate may be obtained from any one of a linter and a pulp.

As a C2 or more acyl group of the cellulose acylate in this invention, an aliphatic group or an aryl group may be sufficient, and is not specifically limited. For example, an alkylcarbonyl ester, an alkenylcarbonyl ester, an aromatic carbonyl ester, an aromatic alkylcarbonyl ester of cellulose, etc. may be mentioned, and each may further have a substituted group. Such preferred examples include propionyl, butanoyl, pentanoyl, hexanoyl, octanoyl, decanoyl, dodecanoyl, tridecanoyl, tetradecanoyl, hexadecanoyl, octadecanoyl and iso-butayl. A noyl group, t-butanoyl group, a cyclohexane carbonyl group, an oleyl group, a benzoyl group, a naphthyl carbonyl group, a cinnamoyl group, etc. are mentioned. Among these, propionyl group, butanoyl group, dodecanoyl group, octadecanoyl group, t-butanoyl group, oleoyl group, benzoyl group, naphthylcarbonyl group, cinnamoyl group and the like are more preferable, and particularly preferably propionyl Group, butanoyl group.

(solvent)

As the solvent 112 for preparing the dope, an aromatic hydrocarbon (for example, benzene, toluene, etc.), a halogenated hydrocarbon (for example, dichloromethane, chlorobenzene, etc.), alcohol (for example, methanol, ethanol, n-propanol) , n-butanol, diethylene glycol, etc.), ketones (e.g., acetone, methyl ethyl ketone, etc.), esters (e.g., methyl acetate, ethyl acetate, propyl acetate, etc.) and ethers (e.g., tetrahydro Furan, methyl cellosolve, etc.) etc. are mentioned.

Among the halogenated hydrocarbons, halogenated hydrocarbons having 1 to 7 carbon atoms are preferably used, and dichloromethane is most preferably used. From the viewpoint of physical properties such as solubility of cellulose acylate, peelability from the support of the flexible membrane, mechanical strength and optical properties of the film, it is preferable to mix one or more kinds of alcohols having 1 to 5 carbon atoms in addition to dichloromethane. As for content of alcohol, 2-25 mass% is preferable with respect to the whole solvent, More preferably, it is 5-20 mass%. Although alcohol, methanol, ethanol, n-propanol, isopropanol, n-butanol, etc. are mentioned, Methanol, ethanol, n-butanol, or such a mixture is used preferably.

In recent years, the solvent composition which does not use dichloromethane is also examined in order to suppress the influence on the environment to the minimum. In this case, ethers of 4 to 12 carbon atoms, ketones of 3 to 12 carbon atoms, esters of 3 to 12 carbon atoms, and alcohols of 1 to 12 carbon atoms are preferable, and these may be appropriately mixed and used. For example, the mixed solvent of methyl acetate, acetone, ethanol and n-butanol is mentioned. Such ethers, ketones, esters and alcohols may have a cyclic structure. Moreover, the compound which has two or more of functional groups of ether, ketone, ester, and alcohol (namely, -O-, -CO-, -COO-, and -OH) can also be used as a solvent.

[Example]

In order to confirm the effect of this invention, the experiment 1-5 was performed below. The detail of each experiment is demonstrated in Experiment 1, and about Experiments 2-5, only the conditions different from Experiment 1 are shown.

(Experiment 1)

In the band manufacturing equipment 10, the 1st band (henceforth band A) was manufactured from the side member 11 made from SUS316, and the center member 12 made from SUS316. The width of the side members was 150 mm and the width of the central members was 2000 mm. Each width | variety of the weld bead 72 and the heat affected area 73 which were visually confirmed was measured. The width of the weld bead 72 was 2 mm and the width of the heat affected zone 73 was 4 mm.

In the welding part of the band A, the number of the pinholes whose diameter is 50 micrometers or more and 70 micrometers or less was five per 1m of longitudinal directions, and one or less per 1mm of longitudinal directions. Moreover, no pinhole with a diameter of 70 micrometers or more existed.

(Measuring method of pinhole)

The number of pinholes in the weld portion was visually counted. In addition, about the diameter of the pinhole visually confirmed, it measured using the fiber scope.

In the solution film-forming facility 110 (refer FIG. 10), the film 116 was manufactured from the dope 113 containing a cellulose diacetate (DAC) and a solvent. Band A was used as the band 91. The moving speed of the band 91 was 40 m / min. The casting die 133 continuously flowed the dope 113 into the band 91 of the moving state. On the surface 91a of the band 91, the flexible film 136 which consists of dope 113 was formed.

The solvent was evaporated from the flexible film 136 on the band 91 using the drying wind from each duct 141-143. The temperature of the drying wind from the 1st duct 141 was 130 degreeC, the temperature of the drying wind from the 2nd duct 142 was 130 degreeC, and the temperature of the drying wind from the 3rd duct 143 was 70 degreeC. In addition, drying of the casting film 136 by the back surface heating part 144 was not performed.

The peeling roller 135 peeled the casting film 136 from the band 91 to make the film 116. When peeling from the band 91, the solvent content rate of the part inside the width direction inside the welding part 91w of the flexible film 136 is 45 mass% DB, and the part on the weld part 91w and the side part 91s of the flexible film 136. The solvent content rate was 45 mass% DB. The film 116 was sequentially sent to the first tenter 120, the roller drying apparatus 124, the second tenter 125, and the slitter 126.

(Experiment 2)

A film 116 was manufactured in the same manner as in Experiment 1 except that Band B was used instead of Band A. The band B is the same as the band A except for the number and diameter of the pinholes in the welded portion. In the welding part of the band B, the number of the pinholes whose diameter is 50 micrometers or more and 70 micrometers or less was 6 pieces per 1m of longitudinal directions, and 2 or less per 1mm of longitudinal directions. Moreover, no pinhole of 70 micrometers or more in diameter existed.

(Experiment 3)

A film 116 was manufactured in the same manner as in Experiment 1 except that Band C was used instead of Band A. The band C is the same as the band A except for the number, diameter, and the like of the pinholes in the welded portion. In the welding part of the band C, the number of the pinholes whose diameter is 50 micrometers or more and 70 micrometers or less was six pieces per 1m of longitudinal directions, and two or less per 2mm of longitudinal directions. The number of pinholes whose diameter is 75 micrometers or more was one in the whole.

(Experiment 4)

Band B was used instead of Band A. The moving speed of the band 91 was 70 m / min. The flexible film 136 was dried using the back heating unit 144 provided at a position opposed to the third duct 143 via the band 91. The heating air having a temperature of 50 ° C. was brought into contact with the flexible membrane 136 by the back heating unit 144. A film 116 was manufactured in the same manner as in Experiment 1 except these. In addition, when peeling from the band 91, the solvent content rate of the part inside the width direction inside the welding part 91w of the flexible film 136 is 70 mass% DB, The welding part 91w and the side part 91s of the flexible film 136 The solvent content rate of the phase part was 60 mass% DB.

(Experiment 5)

Band B was used instead of Band A. The moving speed of the band 91 was 70 m / min. Except these, it carried out similarly to the experiment 1, and produced the film 116. FIG. Moreover, when peeling from the band 91, the solvent content rate of the part inside the width direction inside the weld part 91w of the flexible film 136 is 70 mass% DB, The weld part 91w and the side part 91s of the flexible film 136 The solvent content rate of the part of a phase was 70 mass% DB.

(Peel-off balance evaluation)

About experiment 1-5, it evaluated about the presence or absence of a peeling remainder. In Experiments 1 and 4, no peeling residues occurred. Although little in Experiment 2, peeling residue generate | occur | produced. In experiment 3 and 5, peeling residue generate | occur | produced remarkably.

Claims (7)

A moving band formed by welding a first metal sheet and a second metal sheet, wherein the dope containing polymer and a solvent is continuously discharged to the surface of the moving band exposed by the welding portion extending in the moving direction, and the dope is formed. A film forming step of forming a flexible film covering the welded portion on the surface;
A film drying step of allowing dry air to reach and evaporating the solvent from the flexible film;
A peeling step of peeling the flexible film from the moving band to form a wet film;
Has a film drying step of evaporating the solvent from the wet film,
A welding part heating step of heating the welding part from the back surface side of the movable band between the film forming step and the peeling step is performed. The method of claim 1,
The said welding part heating step is performed with respect to the said flexible film whose solvent content rate is 30 mass% DB or more and 100 mass% DB or less, The solution film forming method characterized by the above-mentioned. A drying apparatus for evaporating the solvent from a film made of a dope comprising a polymer and a solvent formed on the surface of a moving band,
The movable band is made by welding a first metal sheet and a second metal sheet,
Welds extending in the movement direction and exposed to the surface are covered by the film,
And a backside heating part for heating the welded part from the backside side of the movable band. The method of claim 3, wherein
And said back side heating portion comprises a nozzle for causing heating air to reach said welding portion. The method according to claim 3 or 4,
And a dry wind supply unit for allowing dry air to reach the flexible membrane. The method according to claim 3 or 4,
The movable band is formed in an annular shape and circulates in a state spanning the rollers,
A flexible die for flowing out the dope to the surface and a peeling roller for peeling the film from the surface are provided in sequence from the upstream of the moving direction,
The said back heating part is arrange | positioned between the said casting die and the said peeling roller in the said moving direction. The drying apparatus characterized by the above-mentioned. The method according to claim 3 or 4,
The said welding part has a pinhole of 50 micrometers or more and less than 70 micrometers in diameter.

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