Resin film manufacturing device and resin film manufacturing method

Abstract

The present invention provides a film manufacturing device, which can suppress the generation of uneven thickness of a resin film by suppressing the generation of overall airflow in a forming unit. The resin film manufacturing device (1) is provided with a forming unit (20) for forming a resin into a film, and the forming unit (20) includes: a mold (30) having an outlet (31) for extruding a molten resin (101) in a film shape; a casting roller (42) arranged below the mold (30) and used to cool and solidify the molten resin (101) discharged from the outlet (31); cooling rollers (43, 44) and a stripping roller (45) arranged at a position downstream of the casting roller (42) and in contact with the resin film (102) cooled by the casting roller (42); a cover (50) and a wind shield (60) arranged at a position upstream of the casting roller (42); and a wind shield (70) arranged below the stripping roller (45).

Description

Technical Field

[0001] The present invention relates to a resin thin film manufacturing apparatus for manufacturing a resin thin film and a resin thin film manufacturing method for manufacturing a resin thin film using the manufacturing apparatus. Background Art

[0002] As a method for manufacturing a resin film, a T-die casting method is known as a melt extrusion molding method. In the T-die casting method, the resin film sometimes has uneven thickness due to the shaking of the molten film in the area between the mold and the cooling roller (hereinafter referred to as the "air gap"). If the resin film has such uneven thickness, the uniformity of the thickness of the resin film deteriorates. Therefore, especially when the resin film is used for optical purposes, it sometimes has a significant impact on the quality of optical properties.

[0003] In order to suppress such swaying of the molten film, in the resin film manufacturing apparatus of Patent Document 1, a control plate is provided above the nip roller to prevent the air blown from the blowing device for cooling the nip roller from entering the air gap along the surface of the nip roller.

[0004] In addition, in the resin film manufacturing device of Patent Document 2, a pair of shielding plates covering both ends of the resin film in the width direction are provided between the discharge port of the mold and the surface of the cooling roller to suppress the collision of the rising airflow generated by the heat dissipation of the mold with the molten film.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2016-007803

[0008] Patent Document 2: Japanese Patent Application Publication No. 2009-154518 Summary of the invention

[0009] Problem that the invention aims to solve

[0010] However, when manufacturing a resin film, the mold and rollers constituting the molding unit of the manufacturing device are at high temperatures, and the resin film itself being manufactured is also at high temperatures. Therefore, a global airflow is generated inside the molding unit due to the heat generated by such high-temperature objects, and the molten film sometimes sways in the air gap due to the airflow. In contrast, the above-mentioned Patent Documents 1 and 2 only focus on the local airflow in the molding unit, and do not study the overall airflow generated in the above-mentioned molding unit.

[0011] Therefore, an object of the present invention is to provide an apparatus and method for producing a resin thin film that can suppress the occurrence of thickness unevenness in the resin thin film by suppressing the generation of the entire airflow in a molding unit.

[0012] Solutions for solving problems

[0013] The inventors of the present invention have found that the above-mentioned object can be achieved by suppressing the inflow of air from the outside of the forming unit to the bottom of the roller, and have completed the present invention.

[0014] That is, according to the present invention, a device for manufacturing a resin film is provided, wherein the device for manufacturing a resin film is provided with a forming unit for forming the resin into a film shape, and the forming unit is provided with: a mold, which extrudes the molten resin in a film shape; a casting roll, which is arranged below the mold, and cools and solidifies the molten resin discharged from the discharge port of the mold; a downstream side roll, which is arranged at a position closer to the downstream side than the casting roll and contacts the resin film cooled by the casting roll; an upstream side wind shield, which is arranged at a position closer to the upstream side than the casting roll; and a downstream side wind shield, which is arranged below the casting roll or the downstream side roll.

[0015] In addition, in the manufacturing device of the resin film of the present invention, the forming unit may also include a contact roller, which is arranged in a manner opposite to the casting roller, and together with the casting roller, clamps the molten resin discharged from the discharge port, and the upstream side wind shield plate includes: a first upstream side wind shield plate, which is arranged at a position closer to the upstream side than the contact roller; and a second upstream side wind shield plate, which is arranged below the contact roller.

[0016] Furthermore, in the resin film manufacturing apparatus of the present invention, the second upstream wind shielding plate may be tiltably supported by a base portion of the forming unit.

[0017] In addition, in the manufacturing device of the resin film of the present invention, the second upstream side wind shield plate can be arranged below the central axis of the contact roller or at a position closer to the upstream side than below the central axis of the contact roller, and the second upstream side wind shield plate can be tilted toward the upstream side, and the rotation direction of the contact roller is the direction in which the lower part of the contact roller rotates from the downstream side to the upstream side.

[0018] In addition, in the manufacturing device of the resin film of the present invention, the second upstream wind shielding plate may include: an upstream main body portion; and an upstream front end portion, which is arranged at a position closer to the contact roller than the upstream main body portion, and the material constituting the upstream front end portion is different from the material constituting the upstream main body portion, and the upstream front end portion is composed of a resin material.

[0019] Furthermore, in the resin film manufacturing apparatus of the present invention, the second upstream wind shielding plate may include a position adjustment mechanism capable of adjusting a relative position of the upstream front end portion with respect to the upstream main body portion.

[0020] Furthermore, in the resin film manufacturing apparatus of the present invention, the second upstream wind shielding plate may have a convex portion corresponding to the small diameter portion of the touch roller.

[0021] In the resin film manufacturing apparatus of the present invention, the second upstream wind shielding plate may include an upstream window portion through which the bottoms of the touch roll and the casting roll can be visually confirmed.

[0022] In addition, in the resin film manufacturing device of the present invention, the downstream side roller may also include: a cooling roller, which is arranged at a position closer to the downstream side than the casting roller, and cools the resin film; and a peeling roller, which peels the resin film from the cooling roller, and the downstream side wind shield is arranged below the cooling roller or the peeling roller.

[0023] Furthermore, in the resin film manufacturing apparatus of the present invention, the downstream wind shielding plate may be tiltably supported by a base portion of the forming unit.

[0024] In addition, in the manufacturing device of the resin film of the present invention, the downstream side wind shield plate may also include: a downstream side main body portion; and a downstream side front end portion, which is arranged at a position closer to the downstream side roller than the downstream side main body portion, and the material constituting the downstream side front end portion is different from the material constituting the downstream side main body portion, and the downstream side front end portion is composed of a resin material.

[0025] Furthermore, in the resin film manufacturing apparatus of the present invention, the downstream wind shielding plate may include a downstream window portion that enables visual confirmation of the lower side of the downstream roller.

[0026] According to the present invention, there is provided a method for producing a resin film, wherein the resin film is produced by controlling the generation of the entire airflow in the molding unit using any one of the above-mentioned production apparatuses.

[0027] Effects of the Invention

[0028] According to the present invention, by suppressing the inflow of air from outside the forming unit to below the rollers by the upstream and downstream wind shields, the overall airflow in the forming unit can be suppressed, thereby suppressing the occurrence of uneven thickness of the resin film. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 11 is an overall configuration diagram showing an example of a thin film production apparatus according to an embodiment of the present invention.

[0030] Figure 2 This is a schematic cross-sectional view showing an example of a molding unit according to an embodiment of the present invention.

[0031] Figure 3 It is a front view showing the molding unit according to the embodiment of the present invention, and is a diagram showing a state in which the cover is opened.

[0032] Description of Reference Numerals

[0033] 1. Film manufacturing device; 10. Extruder; 11. Hopper; 20. Forming unit; 21. Base; 22. Side wall; 23. Bracket; 24. Magnet; 30. Mold; 31. Discharge port; 41. Contact roller; 411. Main body; 412. Small diameter part; 42. Casting roller; 43, 44. Cooling roller; 45. Stripping roller; 50. Cover; 51. Hinge; 52. Window; 60. Wind shield; 61 , main body; 62, front end portion; 621~623, 1st to 3rd front end portions; 63, position adjustment mechanism; 631, long hole; 632, fastening member; 64, position adjustment mechanism; 65, window portion; 66, hinge; 70, wind shield; 71, main body; 72, front end portion; 73, window portion; 74, hinge; 80, winder; 100, resin; 101, molten resin; 102, resin film. DETAILED DESCRIPTION

[0034] Hereinafter, embodiments of the present invention will be described based on the drawings.

[0035] Figure 1 1 is an overall structural diagram showing an example of a thin film manufacturing apparatus 1 according to the present embodiment. Figure 2 1 is a schematic cross-sectional view showing an example of the molding unit 20 according to the present embodiment. Figure 3 It is a front view showing the molding unit 20 of this embodiment, and is a diagram showing a state in which the cover 50 is opened.

[0036] The film manufacturing device 1 of the present embodiment is a device for manufacturing a resin film 102. The use of the resin film 102 manufactured by the film manufacturing device 1 is not particularly limited, and optical use can be exemplified. In addition, as a specific example of the resin constituting the resin film 102, as long as it is a thermoplastic resin, it is not particularly limited, and acrylic resin, polyolefin resin, polyester resin, polycarbonate resin, ABS resin, etc. can be exemplified. Among them, as a transparent resin for optical film, acrylic resin, polyethylene terephthalate (PET), polycarbonate (PC), cyclic olefin resin (COC), etc. are preferably used.

[0037] like Figure 1 As shown, the film production apparatus 1 includes an extruder 10 , a molding unit 20 , and a winder 80 .

[0038] The extruder 10 heats the resin 100 introduced into the barrel via the hopper 11 while conveying it with a screw, thereby melting the resin 100. The molten resin 101 is continuously supplied to the die 30 of the molding unit 20 connected to the extruder 10. As the extruder 10, either a single-screw extruder or a twin-screw extruder may be used.

[0039] The molding unit 20 is a unit that molds the molten resin 101 supplied from the extruder 10 into a film shape. Figure 2 As shown, the forming unit 20 includes a mold 30, a touch roll 41, a casting roll 42, cooling rolls 43, 44, and a peeling roll 45. The number of cooling rolls is not particularly limited to the above, but can be arbitrarily set according to the type of resin constituting the resin film, and the cooling rolls can also be omitted.

[0040] The die 30 is a so-called T-die for melt extrusion molding. The die 30 has a discharge port 31 for discharging the molten resin 101 continuously supplied from the extruder 10. The molten resin 101 is extruded from the discharge port 31 in a film shape.

[0041] The five rollers 41 to 45 of the forming unit 20 are rotatably supported by the side wall 22 (see FIG. Figure 3 ), and can be driven to rotate by a power transmission mechanism not particularly shown. The five rollers 41 to 45 are arranged in sequence from the upstream side to the downstream side of the forming unit 20. In addition, in this embodiment, "upstream side" and "downstream side" refer to the arrangement direction of the rollers corresponding to the conveying direction of the resin film. Figure 2 In the drawings, the “upstream side” corresponds to the left direction of the paper (the front side of the forming unit 20 ), and the “downstream side” corresponds to the right direction of the paper (the rear side of the forming unit 20 ).

[0042] The touch roll 41 is a roll having a metal surface, and a cooling mechanism for circulating a refrigerant is provided inside the metal surface. In contrast, the cast roll 42 is a roll made of metal having higher rigidity than the touch roll 41, and a cooling mechanism for circulating a refrigerant is provided inside. The touch roll 41 and the cast roll 42 are arranged below the discharge port 31 of the mold 30 so as to face each other, and clamp the molten resin 101 discharged from the discharge port 31 of the mold 30, and cool and solidify it.

[0043] In addition, the molding unit 20 may also include an air supply nozzle or a suction nozzle as described in the above-mentioned Patent Document 2. The air supply nozzle or the suction nozzle forms an air flow that flows in a direction parallel to or orthogonal to the molten resin 101 near the molten resin 101 located in the air gap AG (the region between the discharge port 31 of the mold 30 and the casting roll 42).

[0044] The cooling rolls 43 and 44 are metal rolls having a cooling function similar to the casting roll 42. The resin film 102 formed by the touch roll 41 and the casting roll 42 is conveyed to the cooling rolls 43 and 44. The resin film 102 passes through the casting roll 42 and the two cooling rolls 43 and 44 and is cooled in multiple stages.

[0045] The peeling roller 45 is a metal or resin roller. The peeling roller 45 peels off the resin film 102 from the cooling roller 44 at the most downstream. Figure 1 As shown, the resin film 102 peeled by the peeling roller 45 is delivered from the forming unit 20 and wound into a roll by the winder 80. Alternatively, the resin film 102 peeled by the peeling roller 45 may be delivered to a stretching treatment device instead of the winder 80.

[0046] Furthermore, if Figure 2 As shown, the forming unit 20 of the present embodiment includes a cover 50 and wind shielding plates 60 and 70. The cover 50 of the present embodiment is equivalent to an example of the "first upstream wind shielding plate" in the present invention, the wind shielding plate 60 of the present embodiment is equivalent to an example of the "second upstream wind shielding plate" in the present invention, and the wind shielding plate 70 of the present embodiment is equivalent to an example of the "downstream wind shielding plate" in the present invention.

[0047] The cover 50 is disposed at a position on the upstream side of the touch roller 41. The cover 50 is provided at the front portion of the molding unit 20 so as to cover the area from the base portion 21 of the molding unit 20 to the area above the touch roller 41. The cover 50 is supported on the base portion 21 via a hinge 51, and the front portion of the molding unit 20 can be opened and closed.

[0048] In addition, the cover 50 has a window portion 52 through which the inside of the molding unit 20 can be visually checked. The window portion 52 is formed by fitting a transparent resin member into an opening formed in the cover 50.

[0049] The wind shield plate 60 on the upstream side is a plate-shaped member disposed below the contact roller 41. The wind shield plate 60 separates the space between the base portion 21 of the forming unit 20 and the contact roller 41. The wind shield plate 60 has a main body 61 and a front end portion 62, and the front end portion 62 is disposed at a position closer to the contact roller 41 than the main body 61. In addition, a gap is ensured between the end of the front end portion 62 and the surface of the contact roller 41, and the end of the front end portion 62 does not contact the surface of the contact roller 41.

[0050] The main body 61 is made of a metal material. In contrast, the front end 62 is made of a resin material such as nylon or heat-resistant rubber. By making the front end 62 of a resin material, even if the wind shielding plate 60 contacts the contact roller 41, damage to the contact roller 41 and the wind shielding plate 60 can be suppressed.

[0051] The main body 61 of the wind shielding plate 60 has a window 65 through which the bottom of the touch roll 41 and the casting roll 42 can be visually confirmed. The window 65 is formed by fitting a transparent resin member into an opening formed in the wind shielding plate 60.

[0052] like Figure 3 As shown, the front end portion 62 of the wind shield plate 60 includes a first front end portion 621, a second front end portion 622, and a third front end portion 623. The first front end portion 621 is arranged at the center of the wind shield plate 60. The second front end portion 622 is arranged outside the first front end portion 621. The third front end portion 623 is arranged further outside the second front end portion 622, constituting both ends of the front end portion 62. Here, the contact roller 41 has a main body portion 411 and a small diameter portion 412, the main body portion 411 includes a portion that contacts the resin film 102, and the small diameter portion 412 is located at both ends of the main body portion 411 and supports the main body portion 411. The third front end portion 623 is arranged in a manner corresponding to the small diameter portion 412 of the contact roller 41.

[0053] The first distal end portion 621 is fixed to the main body portion 61 by a fixing member such as a bolt. In addition, the first distal end portion 621 may be relatively movable with respect to the main body portion 61 using a position adjustment mechanism described later.

[0054] On the other hand, the second front end portion 622 is mounted on the main body 61 via a position adjustment mechanism 63. The position adjustment mechanism 63 is composed of a long hole 631 formed in the second front end portion 622 along the up-down direction, a round hole (not shown) formed in the main body 61 in a manner opposite to the long hole 631, and a fastening member 632 such as a bolt penetrating the long hole 631 and the round hole. The position adjustment mechanism 63 enables the second front end portion 622 to be relatively moved in the up-down direction relative to the main body 61, and the size of the gap between the wind shielding plate 60 and the contact roller 41 can be adjusted.

[0055] Similarly, the third front end portion 623 is also mounted on the main body 61 via a position adjustment mechanism 64. The position adjustment mechanism 64 has the same structure as the above-mentioned position adjustment mechanism 63. Through the position adjustment mechanism 64, the third front end portion 623 can be relatively moved in the up-down direction relative to the main body 61, and the size of the gap between the wind shield plate 60 and the contact roller 41 can be adjusted.

[0056] The third front end 623 protrudes upwards from the other front ends 621 and 622 to form a convex portion of the wind shield 60. The convex portion is close to the small diameter portion 412 of the contact roller 41, and the wind shield 60 improves the airtightness between the base 21 of the molding unit 20 and the contact roller 41.

[0057] In addition, in this embodiment, if Figure 2 As shown, the wind shielding plate 60 is supported by the base portion 21 of the molding unit 20 via a hinge 66 and can be tilted. Thus, by making the wind shielding plate 60 tiltable, maintenance inside the molding unit 20 is easy.

[0058] The wind shield 60 can be tilted toward the upstream side by the hinge 66. In contrast, the rotation direction of the contact roller 41 is the direction in which the lower part of the contact roller 41 rotates from the downstream side to the upstream side. Figure 2 That is, in the portion where the wind shielding plate 60 and the contact roller 41 face each other, the tilting direction of the wind shielding plate 60 coincides with the rotation direction of the contact roller 41. Therefore, even when the resin film 102 is wound around the contact roller 41 and the resin film 102 is in contact with the wind shielding plate 60, by tilting the wind shielding plate 60 using the hinge 66, damage to the contact roller 41 or the wind shielding plate 60 can be suppressed.

[0059] In addition, if Figure 3 As shown, a bracket 23 is provided on the side wall 22 of the forming unit 20. The bracket 23 is fixed to the side wall 22 in a manner protruding toward the inner side of the forming unit 20. In addition, the bracket 23 is arranged in a manner opposite to both ends of the wind shield 60. A magnet 24 is installed at the front end of the bracket 23. The metal wind shield 60 is held by the magnet 24, and the wind shield 60 can be easily tilted even when the resin film 102 wound on the contact roller 41 contacts the wind shield 60.

[0060] The wind shielding plate 60 may be disposed at a position below the contact roller 41 without being particularly limited, but in order to allow the wind shielding plate 60 to tilt toward the upstream side, it is preferably disposed at a position lower than the central axis CL0 (see FIG. Figure 2 ) is positioned below the upstream side. In addition, from the perspective of avoiding contact between the wind shield plate 60 and the contact roller 41, the setting position of the wind shield plate 60 is more preferably directly below the central axis CL0 of the contact roller 41.

[0061] The downstream windshield plate 70 is a plate-shaped member disposed below the peeling roller 45. Figure 2As shown, the wind shield 70 separates the space between the base portion 21 of the forming unit 20 and the peeling roller 45. The wind shield 60 also has a main body 71 and a front end 72, similarly to the wind shield 60 on the upstream side, and the front end 72 is arranged at a position closer to the peeling roller 45 than the main body 71. In addition, a gap is ensured between the end of the front end 72 and the surface of the peeling roller 45, and the end of the front end 72 does not contact the surface of the peeling roller 45.

[0062] The main body 71 is made of a metal material. In contrast, the front end 72 is made of a resin material such as nylon or heat-resistant rubber. By making the front end 72 of a resin material, even if the windshield plate 70 contacts the stripping roller 45, damage to the stripping roller 45 and the windshield plate 70 can be suppressed.

[0063] The main body 71 of the wind shielding plate 70 has a window 73 through which the lower part of the cooling rollers 43 and 44 and the peeling roller 45 can be visually confirmed. The window 73 is formed by fitting a transparent resin member into an opening formed in the wind shielding plate 70.

[0064] In addition, in the present embodiment, the wind shield plate 70 is supported on the base portion 21 of the forming unit 20 via a hinge 74, and is a tiltable type. From the perspective of maintainability in the forming unit 20, the downstream wind shield plate 70 can be tilted toward the downstream side via the hinge 74. Similar to the upstream wind shield plate 60, a bracket is provided on the side wall 22 of the forming unit 20, and the wind shield plate 70 is held by a magnet mounted on the front end of the bracket, which is not specifically shown in the figure.

[0065] In addition, similarly to the upstream wind shielding plate 60, a convex portion corresponding to the shape of the peeling roller 45 may be formed on the wind shielding plate 70. In addition, the front end portion 72 may be relatively movable in the vertical direction relative to the main body portion 71 by a position adjustment mechanism.

[0066] The installation position of the wind shield plate 70 is not particularly limited as long as it is below the peeling roller 45, but in order to allow the wind shield plate 70 to tilt toward the downstream side, it is preferably located lower than the central axis CL1 (see Figure 2 ) is located below the downstream side. In addition, from the viewpoint of avoiding contact between the wind shield plate 70 and the peeling roller 45, the wind shield plate 70 is more preferably located directly below the central axis CL1 of the peeling roller 45.

[0067] In addition, in the present embodiment, the wind shield plate 70 on the downstream side is arranged below the stripping roller 45, but the setting position of the wind shield plate 70 on the downstream side is not particularly limited as long as it is below the roller on the downstream side of the contact roller 41. Specifically, the wind shield plate 70 on the downstream side may also be arranged below any one of the casting roller 42, the cooling roller 43 or the cooling roller 44. In addition, from the viewpoint of preventing air from flowing into the forming unit 20 from the outside, it is preferred that the wind shield plate 70 on the downstream side is arranged below the stripping roller 45.

[0068] Here, as described above, in the manufacture of the resin film, the resin film, the mold and the roller are at high temperatures. Therefore, in the conventional film manufacturing apparatus, the rising airflow generated by the heat generated from these high-temperature objects generates a large airflow in the forming unit as follows: the air below the roller is sucked toward the upper side of the roller through the gap or space between the rollers, and the air is sucked from the outside of the forming unit to the lower side of the roller.

[0069] In addition, as a specific example of the gap between the rolls, there can be cited a gap formed between the rolls on the outside of the resin film in the touch roll and the casting roll. In addition, as a specific example of the space between the rolls, there can be cited a space formed between the small diameter portion of the touch roll and the small diameter portion of the casting roll, a space formed between the casting roll and the cooling roll, a space formed between the cooling rolls, and a space formed between the cooling roll and the stripping roll.

[0070] In contrast, in the present embodiment, a cover 50 is provided at the front portion of the forming unit 20, and a wind shield 60 is provided below the contact roller 41, thereby preventing outside air from flowing into the forming unit 20 from the front of the forming unit 20. Similarly, a wind shield 70 is provided below the peeling roller 45, thereby preventing outside air from flowing into the forming unit 20 from the rear of the forming unit 20.

[0071] In this way, by using the cover 50 and the wind shield plates 60 and 70 to prevent the outside air from intruding from the outside to the bottom of the rollers 41 to 45 of the molding unit 20, the flow of the air below the rollers 41 to 45 can be blocked, and the suction caused by the rising airflow caused by the high-temperature object can be suppressed. Therefore, the generation of global airflow in the molding unit 20 can be suppressed, and the molten film can be suppressed from shaking in the air gap, so that the thickness of the resin film can be suppressed.

[0072] In addition, in the thin film manufacturing apparatus 1, in order to check the condition in the forming unit 20, perform roller maintenance, etc., the thin film manufacturing apparatus 1 is sometimes operated with the cover 50 opened. Therefore, in the present embodiment, both the cover 50 and the wind shield 60 are arranged at a position on the upstream side of the casting roll 42, and a double wind shield structure is adopted. Thus, even when the thin film manufacturing apparatus 1 is operated with the cover 50 opened, the wind shield 60 can suppress the intrusion of external air from the front of the forming unit 20 to the bottom of the rollers 41 to 45, and the wind shield 60 can also function as a safety cover.

[0073] In addition, the embodiments described above are described to facilitate understanding of the present invention, and are not described to limit the present invention. Therefore, the elements disclosed in the above embodiments are intended to include all design changes and equivalents that fall within the technical scope of the present invention.

[0074] In the above-mentioned embodiment, an example in which the present invention is applied to the thin film manufacturing apparatus 1 for manufacturing a single-layer resin thin film 102 is described, but the present invention is not particularly limited thereto. For example, the present invention may also be applied to a thin film manufacturing apparatus for manufacturing a multi-layer resin thin film. Alternatively, the present invention may also be applied to a thin film manufacturing apparatus for manufacturing a composite thin film having a central portion composed of a first resin and both end portions composed of a second resin different from the first resin.

[0075] In the above-mentioned embodiment, the shaping unit 20 includes both the cover 50 and the wind shielding plate 60, but the present invention is not particularly limited thereto. The shaping unit 20 may include only the cover 50 without the wind shielding plate 60. Alternatively, the shaping unit 20 may include only the wind shielding plate 60 without the cover 50.

[0076] In addition, in the above-mentioned embodiment, an example in which the present invention is applied to a film manufacturing apparatus of a touch roll method using a touch roll is described, but the present invention is not particularly limited thereto, and the present invention may also be applied to a so-called cast roll method that does not use a touch roll. In this case, the forming unit includes a cover 50 and a downstream windshield plate 70 as a windshield plate, and does not include an upstream windshield plate 60.

Claims

1. A device for producing a resin film, wherein: The resin film manufacturing device comprises a forming unit for forming the resin into a film shape. The forming unit comprises: a die, which extrude the molten resin in a thin film; a casting roll disposed below the mold to cool and solidify the molten resin discharged from the discharge port of the mold; a downstream roll disposed at a position downstream of the casting roll and in contact with the resin film cooled by the casting roll; An upstream windshield plate disposed upstream of the casting roll; a downstream wind shield disposed below the casting roll or the downstream roll; and a touch roll disposed so as to face the casting roll and, together with the casting roll, to nip and press the molten resin discharged from the discharge port; The upstream wind shield comprises: a first upstream wind shield disposed upstream of the contact roller; as well as The second upstream wind shielding plate is disposed below the touch roller.

2. The resin film manufacturing device according to claim 1, wherein: The second upstream wind shielding plate is tiltably supported by a base portion of the shaping unit.

3. The resin film manufacturing device according to claim 2, wherein: The second upstream wind shield is disposed below the central axis of the touch roller or upstream of the central axis of the touch roller. The second upstream wind shielding plate can be tilted toward the upstream side. The rotation direction of the touch roller is a direction in which the lower portion of the touch roller rotates from the downstream side toward the upstream side.

4. The resin film manufacturing apparatus according to claim 1, wherein: The second upstream wind shield comprises: an upstream main body portion; and an upstream front end portion arranged at a position closer to the contact roller than the upstream main body portion, The material constituting the upstream front end portion is different from the material constituting the upstream main body portion. The upstream front end portion is made of a resin material.

5. The resin film manufacturing apparatus according to claim 4, wherein: The second upstream wind shielding plate includes a position adjustment mechanism capable of adjusting a relative position of the upstream front end portion with respect to the upstream main body portion.

6. The resin film manufacturing apparatus according to claim 1, wherein: The second upstream wind shielding plate has a convex portion corresponding to the small diameter portion of the contact roller.

7. The resin film manufacturing apparatus according to claim 1, wherein: The second upstream wind shielding plate has an upstream window portion through which the bottoms of the touch roll and the casting roll can be visually confirmed.

8. The resin film manufacturing apparatus according to claim 1, wherein: The downstream side roller comprises: a cooling roll disposed downstream of the casting roll and configured to cool the resin film; and a peeling roller that peels the resin film from the cooling roller, The downstream wind shielding plate is disposed below the cooling roller or the peeling roller.

9. The resin film manufacturing apparatus according to claim 8, wherein: The downstream wind shielding plate is tiltably supported by a base portion of the shaping unit.

10. The resin film manufacturing apparatus according to claim 8, wherein: The downstream wind shield comprises: a downstream main body portion; and a downstream front end portion arranged at a position closer to the downstream roller than the downstream main body portion, The material constituting the downstream front end portion is different from the material constituting the downstream main body portion. The downstream front end portion is made of a resin material.

11. The resin film manufacturing apparatus according to claim 1, wherein: The downstream wind shielding plate includes a downstream window portion through which a lower portion of the downstream roller can be visually confirmed.

12. A method for producing a resin film, wherein: By using the manufacturing apparatus according to any one of claims 1 to 11, the generation of the entire airflow in the molding unit is controlled to manufacture the resin film.

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