TW202302317A - Resin film manufacturing apparatus and resin film manufacturing method - Google Patents

Abstract

The present invention provides a film manufacturing apparatus capable of suppressing the generation of thickness unevenness of a resin film by suppressing the generation of an overall air flow in a molding unit. An apparatus (1) for manufacturing a resin film is provided with a molding unit (20) for molding a resin into a film shape, and the molding unit (20) comprises: a mold (30) having a discharge port (31) for extruding a molten resin (101) into a film shape; a casting roller (42) which is disposed below the mold (30) and cools and solidifies the molten resin (101) discharged from the discharge port (31); cooling rollers (43, 44) and a stripping roller (45) which are arranged on the downstream side of the casting roller (42) and are in contact with the resin film (102) cooled by the casting roller (42); a cover (50) and a windproof plate (60) that are disposed on the upstream side of the casting roller (42); and a windproof plate (70) disposed below the peeling roller (45).

Description

Resin film manufacturing apparatus, and resin film manufacturing method

The present invention relates to a manufacturing apparatus of a resin film for manufacturing a resin film, and a method for manufacturing a resin film using the manufacturing apparatus.

As a method of manufacturing resin films, T-die casting method is one of the melt extrusion molding methods. In this T-die casting method, the thickness of the resin film may be uneven due to shaking of the molten mold in the area between the mold and the cooling roll (hereinafter referred to as "air gap"). If such thickness unevenness occurs in the resin film, the thickness uniformity of the resin film will deteriorate. Therefore, especially when the resin film is used for optical applications, it may greatly affect the quality of optical characteristics and the like. Condition.

In order to suppress such swaying of the molten film, in the manufacturing apparatus of the resin film of Patent Document 1, a control plate is provided above the roll to prevent the air jetted from the air ejector for cooling the roll from circulating along the surface of the roll. air gap.

Also, in the manufacturing apparatus of the resin film of Patent Document 2, by providing a pair of shielding plates covering one of both ends in the width direction of the resin film between the discharge port of the mold and the surface of the cooling roll, the heat dissipation caused by the mold is suppressed. The resulting updraft comes into contact with the molten film. [Prior Art Literature] [Patent Document]

[Patent Document 1] Japanese Unexamined Patent Publication No. 2016-007803 [Patent Document 2] Japanese Unexamined Patent Publication No. 2009-154518

[Problem to be solved by the invention]

However, when manufacturing a resin film, the mold and roll which comprise the shaping|molding unit of this manufacturing apparatus become high temperature, and the resin film itself also becomes high temperature during manufacture. Therefore, inside the forming unit, a wide airflow is generated by the heat emitted by such a high-temperature object, and the molten film may fluctuate in the air gap due to the airflow. In contrast, the aforementioned Patent Documents 1 and 2 only focus on the local airflow in the molding unit, and do not examine the overall airflow generated in the molding unit.

Therefore, an object of the present invention is to provide a resin film manufacturing apparatus and a resin film manufacturing method capable of suppressing the occurrence of thickness unevenness of the resin film by suppressing the generation of airflow throughout the molding unit. [Technical means to solve the problem]

The present inventors have found that the aforementioned object can be achieved by suppressing the inflow of air from the outside of the forming unit to the lower side of the roll, and completed the present invention.

That is, according to the present invention, there is provided a manufacturing device of a resin film, which is equipped with a forming unit for forming resin into a film shape, and is characterized in that: the above-mentioned forming unit has: a mold for extruding molten resin into a film shape; a roll arranged below the mold for cooling and solidifying the molten resin discharged from the discharge port of the mold; a downstream roll arranged on the downstream side of the casting roll and cooled by the casting roll The resin film contacts; the upstream windshield plate is arranged on the upstream side of the casting roll; and the downstream windshield plate is arranged under the casting roll or the downstream side roll.

In addition, in the manufacturing apparatus of the resin film of the present invention, the forming unit may further include a touch roll arranged to face the casting roll, and together with the casting roll, sandwich the molten resin discharged from the discharge port. In other words, the upstream windshield includes: a first upstream windshield disposed upstream of the touch roller; and a second upstream windshield disposed below the touch roller.

Moreover, in the manufacturing apparatus of the resin film of this invention, the said 2nd upstream side windshield board may be supported so that it may incline at the base part of the said molding unit.

Moreover, in the manufacturing apparatus of the resin film of this invention, the said 2nd upstream side windshield board may be arrange|positioned below the central axis of the said touch roller, or the upstream side below the central axis of the said touch roller. , the second upstream windshield can be tilted toward the upstream side, and the rotation direction of the touch roller is the direction in which the lower part of the touch roller goes around from the downstream side to the upstream side.

In addition, in the manufacturing apparatus of the resin film of the present invention, the second upstream windshield may include: an upstream body part; and an upstream front end part disposed closer to the touch roller than the upstream body part. Nearby, the material constituting the upstream front end portion is different from the material constituting the upstream body portion, and the upstream front end portion is made of a resin material.

Moreover, in the manufacturing apparatus of the resin film of this invention, the said 2nd upstream side windshield board may have a position adjustment mechanism which can adjust the relative position of the said upstream side front-end|tip part to the said upstream side main body part.

Moreover, in the manufacturing apparatus of the resin film of this invention, the said 2nd upstream windshield plate may have the convex part corresponding to the small-diameter part of the said touch roller.

Moreover, in the manufacturing apparatus of the resin film of this invention, the said 2nd upstream side windshield plate may have the upstream side window part which can recognize the below of the said touch roll and the said casting roll.

In addition, in the manufacturing apparatus of the resin film of the present invention, the aforementioned downstream side roll may include: a cooling roll disposed on the downstream side of the aforementioned casting roll for cooling the aforementioned resin film; The cooling roll peels the resin film, and the downstream windshield plate is arranged below the cooling roll or the peeling roll.

Moreover, in the manufacturing apparatus of the resin film of this invention, the said downstream side windshield board may be supported so that it may incline at the base part of the said molding unit.

Moreover, in the manufacturing apparatus of the resin film of this invention, the said downstream side windshield board may comprise: a downstream side main body part; A material constituting the downstream front end portion is different from a material constituting the downstream body portion, and the downstream front end portion is formed of a resin material.

Moreover, in the manufacturing apparatus of the resin film which concerns on this invention, the said downstream side windshield board may have the downstream side window part which can recognize the below of the said downstream side roll.

Also, according to the present invention, it is possible to provide a resin film manufacturing method for manufacturing a resin film by controlling the overall airflow generation in the molding unit by using any one of the aforementioned manufacturing apparatuses. [Invention effect]

According to the present invention, by suppressing the inflow of air from the outside of the molding unit to the lower side of the rollers with the upstream and downstream windshields, the generation of air flow in the entire molding unit can be suppressed, so that the thickness unevenness of the resin film can be suppressed. produce.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an overall structural view showing an example of a thin film manufacturing apparatus 1 according to this embodiment, FIG. 2 is a schematic cross-sectional view showing an example of a molding unit 20 according to this embodiment, and FIG. 3 is a front view showing the molding unit 20 according to this embodiment. Fig. 1 shows a state in which the cover 50 is opened.

The film manufacturing apparatus 1 of this embodiment is an apparatus for manufacturing a resin film 102 . The application of the resin film 102 produced by the film production apparatus 1 is not particularly limited, but optical applications are mentioned, for example. Further, specific examples of the resin constituting the resin film 102 are not particularly limited as long as it is a thermoplastic resin, but examples include acrylic resins, polyolefin resins, polyester resins, polycarbonate resins, ABS resin, etc. Among these resins, acrylic resins, polyethylene terephthalate (PET), polycarbonate (PC), cyclic olefin resins (COC) and the like are preferably used as transparent resins for optical films.

This film manufacturing apparatus 1 includes an extruder 10 , a molding unit 20 , and a coiler 80 as shown in FIG. 1 .

The extruder 10 heats the resin 100 thrown into the cylinder through the feed hopper 11 by a screw, and melts 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 uniaxial extruder or a biaxial extruder may be used.

The forming unit 20 is a unit that forms the molten resin 101 supplied from the extruder 10 into a film. This forming unit 20 includes a die 30 , a touch roll 41 , a casting roll 42 , cooling rolls 43 and 44 , and a peeling roll 45 as shown in FIG. 2 . In addition, the number of cooling rolls is not specifically limited in the above-mentioned, According to the kind of resin which comprises a resin film, etc., it can set arbitrarily, and a cooling roll can also be omitted.

The die 30 is a so-called T-die for melt extrusion molding. This 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 in the form of a film from the discharge port 31 .

The five rollers 41-45 of the forming unit 20 are rotatably supported on the side wall 22 (refer to FIG. Rotary drive. The five rolls 41 to 45 are arranged in this order from the upstream side of the forming unit 20 toward the downstream side. Furthermore, in the present embodiment, "upstream side" and "downstream side" refer to the arrangement direction of the rollers corresponding to the conveying direction of the resin film. In FIG. 2, the "upstream side" corresponds to the left direction of the paper (forming unit 20), the "downstream side" corresponds to the right direction of the paper (the rear side of the forming unit 20).

The touch roller 41 is a roller having a metal surface, and is provided with a cooling mechanism that circulates a cooling medium inside the metal surface. On the other hand, the casting roll 42 is a metal roll with higher rigidity than the touch roll 41, and is equipped with the cooling mechanism which circulates the cooling medium inside. The touch roller 41 and the casting roller 42 are arranged to face each other below the discharge port 31 of the mold 30 , and the molten resin 101 discharged from the discharge port 31 of the mold 30 is pinched and cooled to solidify.

Furthermore, the molding unit 20 may also be equipped with the air blowing nozzle or suction nozzle as described in the said patent document 2. This blowing nozzle or suction nozzle is formed in the vicinity of the molten resin 101 located in the air gap AG (the area between the discharge port 31 of the mold 30 and the casting roll 42), in a direction parallel to the molten resin 101 or perpendicular to the molten resin 101. direction of air flow.

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

The peeling roller 45 is a roller made of metal or resin. This peeling roller 45 peels the resin film 102 from the most downstream cooling roller 44 . As shown in FIG. 1 , the resin film 102 peeled off by the peeling roller 45 is carried out from the forming unit 20 and wound up into a roll shape by a winder 80 . In addition, instead of the winder 80, the resin film 102 peeled by the peeling roll 45 may be carried out to a stretching processing apparatus.

Moreover, the molding unit 20 of this embodiment is equipped with the cover 50 and the windshield board 60,70 as shown in FIG. The cover 50 of this embodiment corresponds to an example of the "first upstream windshield" of the present invention, the windshield 60 of this embodiment corresponds to an example of the "second upstream windshield" of the present invention, and the windshield of this embodiment The board 70 corresponds to an example of the "downstream side windshield board" of the present invention.

The cover 50 is disposed on the upstream side of the touch roller 41 . The cover 50 is disposed on the front portion of the forming unit 20 to cover the area from the base portion 21 of the forming unit 20 to the area above the touch roller 41 . Moreover, this cover 50 is supported by the base part 21 via the hinge 51, and the front part of the molding unit 20 can be opened and closed.

Moreover, this cover 50 has the window part 52 which can recognize the inside of the molding unit 20. As shown in FIG. The window portion 52 is formed by fitting a transparent resin member into an opening formed in the cover 50 .

The windshield plate 60 on the upstream side is a plate-shaped member disposed below the touch roller 41 . The windproof plate 60 partitions the space between the base portion 21 of the forming unit 20 and the touch roller 41 . The windproof plate 60 has a main body 61 and a front end 62 disposed closer to the touch roller 41 than the main body 61 . Furthermore, a gap is ensured between the end portion of the front end portion 62 and the surface of the touch roller 41 , and the end portion of the front end portion 62 is not in contact with the surface of the touch roller 41 .

The main body portion 61 is made of a metal material. On the other hand, the front end portion 62 is made of a resin material such as nylon or heat-resistant rubber. By constituting the front end portion 62 with a resin material, even if the windshield plate 60 accidentally touches the touch roller 41, damage to the touch roller 41, the windshield plate 60, and the like can be suppressed.

The main body portion 61 of the windproof board 60 has a window portion 65 below which the touch roller 41 and the casting roller 42 can be seen. The window portion 65 is formed by fitting a transparent resin member into an opening formed in the windshield plate 60 .

As shown in FIG. 3 , the front end portion 62 of the windshield 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 windshield 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 on the outer side of the second front end portion 622 and constitutes both ends of the front end portion 62 . Here, the touch roller 41 has: a body portion 411 including a portion in contact with the resin film 102 ; and small diameter portions 412 located at both ends of the body portion 411 for supporting the body portion 411 . The third front end portion 623 is arranged to correspond to the small diameter portion 412 of the touch roller 41 .

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

On the other hand, the second front end portion 622 is attached to the main body portion 61 via the position adjustment mechanism 63 . This position adjustment mechanism 63 is composed of a long hole 631 formed in the second front end portion 622 along the vertical direction, a round hole (not shown) formed in the main body portion 61 so as to face the long hole 631 , and a through hole. The elongated hole 631 and the fastening member 632 such as the bolt of the round hole are constituted. With this position adjustment mechanism 63 , the second front end portion 622 can be moved vertically relative to the main body portion 61 , and the size of the gap between the windshield plate 60 and the touch roller 41 can be adjusted.

Similarly, the third front end portion 623 is also attached to the main body portion 61 via the position adjustment mechanism 64 . This position adjustment mechanism 64 has the same structure as the aforementioned position adjustment mechanism 63 . With this position adjustment mechanism 64 , the third front end portion 623 can be moved vertically relative to the main body portion 61 , and the size of the gap between the windshield plate 60 and the touch roller 41 can be adjusted.

Moreover, this third front end portion 623 protrudes upward compared to the other front end portions 621 and 622 , and forms a convex portion of the windshield plate 60 . The protrusion enters into the small-diameter portion 412 of the touch roller 41 to improve the airtightness between the base portion 21 of the forming unit 20 and the touch roller 41 by the windproof plate 60 .

Moreover, in this embodiment, as shown in FIG. 2, this windshield board 60 is supported by the base part 21 of the molding unit 20 via the hinge 66, and can be tilted. In this way, maintenance in the molding unit 20 is facilitated by making the windshield plate 60 a collapsible form.

This windshield 60 can be tilted toward the upstream side by the hinge 66 . On the other hand, the rotation direction of the touch roller 41 is formed in a direction in which the lower portion of the touch roller 41 goes around from the downstream side to the upstream side, which is clockwise in FIG. 2 . That is, at the portion where the windproof plate 60 and the touch roller 41 face each other, the tilting direction of the windproof plate 60 is consistent with the rotation direction of the touch roller 41 . Therefore, even if the resin film 102 is wound around the touch roller 41, causing the resin film 102 to contact the windshield plate 60, the windshield plate 60 can be tilted by the hinge 66, and the touch roller 41, the windshield plate 60, etc. are prevented from being damaged. damage.

Moreover, as shown in FIG. 3 , a bracket 23 is provided on the side wall 22 of the molding unit 20 . The bracket 23 is fixed to the side wall 22 so as to protrude toward the inner side of the molding unit 20 . Moreover, this bracket 23 is arrange|positioned so that it may oppose both ends of the windshield board 60. As shown in FIG. A magnet 24 is attached to the front end of the bracket 23 . Since the metal windshield 60 is held by the magnet 24 , even when the resin film 102 wound on the touch roller 41 is in contact with the windshield 60 , the windshield 60 can be easily toppled over.

Furthermore, the installation position of the windproof plate 60 is not particularly limited if it is below the touch roller 41, but in order to allow the windproof plate 60 to be tilted toward the upstream side, the central axis CL of the touch roller 41 _{is 0} (Refer to FIG. 2 ) The lower and more upstream sides are preferable. Also, from the viewpoint of avoiding contact with the touch roller 41 of the windshield 60 , it is preferable that the installation position of the windshield 60 be directly below the center axis CL ₀ of the touch roller 41 .

The windshield plate 70 on the downstream side is a plate-shaped member arranged below the peeling roller 45 . As shown in FIG. 2 , this windshield plate 70 partitions the space between the base portion 21 of the forming unit 20 and the peeling roller 45 . Like the upstream windshield 60 , this windshield 70 also has a main body 71 and a front end 72 disposed nearer the peeling roller 45 than the main body 71 . In addition, a gap is ensured between the end portion of the front end portion 72 and the surface of the peeling roller 45 , and the end portion of the front end portion 72 is not in contact with the surface of the peeling roller 45 .

The main body portion 71 is made of a metal material. On the other hand, the front end portion 72 is made of a resin material such as nylon or heat-resistant rubber. By constituting the front end portion 72 with a resin material, even when the windshield plate 70 accidentally comes into contact with the peeling roller 45, damage to the peeling roller 45, the windshield plate 70, and the like can be suppressed.

The main body portion 71 of this windshield plate 70 has a window portion 73 through which the cooling rollers 43 , 44 and the peeling roller 45 can be seen below. The window portion 73 is formed by fitting a transparent resin member into an opening formed in the windshield plate 70 .

Moreover, in this embodiment, this windshield board 70 is supported by the base part 21 of the molding unit 20 via the hinge 74, and is formed in the form which can be poured. From the viewpoint of maintainability in the forming unit 20 , the downstream windshield 70 can be tilted downstream by the hinge 74 . In particular, although not shown, a bracket is provided on the side wall 22 of the forming unit 20 similarly to the windshield plate 60 on the upstream side, and the windshield plate 70 is held by a magnet attached to the front end of the bracket.

In addition, similarly to the windshield plate 60 on the upstream side, the windshield plate 70 may have a convex portion corresponding to the shape of the peeling roller 45 . In addition, the front end portion 72 may be relatively movable in the vertical direction with respect to the main body portion 71 by a position adjustment mechanism.

Also, the installation position of the windshield 70 is not particularly limited as long as it is below the peeling roller 45. However, in order to allow the windshield 70 to be tilted toward the downstream side, the position is lower than the central axis _CL1 of the peeling roller 45 (see FIG. 2) is preferably further downstream. Also, from the viewpoint of avoiding contact with the peeling roller 45 of the windshield 70 , it is preferable to install the windshield 70 directly below the center axis _CL1 of the peeling roller 45 .

Also, in the present embodiment, the downstream side windproof plate 70 is arranged below the peeling roller 45, but if the installation position of the downstream side windproof plate 70 is below the roller further downstream than the touch roller 41, then Not particularly limited. Specifically, the windshield plate 70 on the downstream side may be provided below any one of the casting roll 42 , the cooling roll 43 , or the cooling roll 44 . In addition, from the viewpoint of preventing air from flowing into the molding unit 20 from the outside, it is preferable that the downstream windshield plate 70 is disposed below the peeling roller 45 .

Here, as mentioned above, in the manufacture of a resin film, a resin film, a mold, and a roll become high temperature. Therefore, in a film manufacturing device with a conventional structure, the air below the rolls is sucked to the top of the rolls through the gap between the rolls, the space, etc. due to the updraft generated by the heat generated by these high-temperature objects, and the air flows from the forming The outside of the unit is sucked under the rollers, ie an atmospheric air flow is generated inside the forming unit.

In addition, as a specific example of the gap between the rolls, for example, the gap between the rolls formed on the outside of the resin film between the touch roll and the casting roll may be mentioned. Further, specific examples of the space between the rolls include, for example, the space formed between the small-diameter portion of the touch roll and the small-diameter portion of the casting roll, the space formed between the casting roll and the cooling roll, and the space formed between the casting roll and the cooling roll. The space between the cooling rolls and the space formed between the cooling roll and the peeling roll.

On the other hand, in this embodiment, by providing the cover 50 at the front portion of the molding unit 20 and the windshield 60 below the touch roller 41, it is possible to suppress outside air from flowing into the molding unit 20 from the front of the molding unit 20. . Similarly, by providing the windshield plate 70 below the peeling roller 45, the inflow of outside air into the forming unit 20 from the rear of the forming unit 20 can be suppressed.

In this way, the cover 50 and the windshield plates 60 and 70 suppress the intrusion of outside air from the outside to below the rollers 41 to 45 of the forming unit 20, and can block the flow of air existing below the rollers 41 to 45, thereby suppressing the cause. The updraft of the hot object is sucked up. Therefore, generation of a wide airflow in the forming unit 20 can be suppressed, and fluctuation of the molten film in the air gap can be suppressed, thereby suppressing occurrence of uneven thickness of the resin film.

In addition, in the film manufacturing apparatus 1 , the film manufacturing apparatus 1 may be operated with the cover 50 opened for status confirmation in the molding unit 20 , maintenance of the rolls, and the like. Therefore, in this embodiment, both the cover 50 and the windshield plate 60 are arrange|positioned on the upstream side rather than the casting roll 42, and the double windshield structure is employ|adopted. Thereby, even when the film manufacturing apparatus 1 is operated with the cover 50 opened, the windproof plate 60 can suppress the intrusion of outside air from the front of the forming unit 20 to the bottom of the rollers 41 to 45, and also the The windshield 60 functions as a safety cover.

In addition, the embodiment described above is described for easy understanding of this invention, and it is not description for limiting this invention. Therefore, each element disclosed in the aforementioned embodiments also includes all technical modifications, equivalents, and the like that fall within the technical scope of the present invention.

In the foregoing embodiments, an example in which the present invention is applied to the film production apparatus 1 for producing a single-layer resin film 102 has been described, but the present invention is not limited thereto. For example, the present invention can also be applied to a film manufacturing apparatus that manufactures a multilayer resin film. Alternatively, the present invention is applied to a film manufacturing apparatus for manufacturing a composite film having a central portion made of a first resin and both end portions made of a second resin different from the first resin.

Moreover, in the above-mentioned embodiment, although the molding unit 20 was equipped with both the cover 50 and the windshield plate 60, it is not limited to this. The forming unit 20 may include only the cover 50 without the windshield 60 . Alternatively, the molding unit 20 includes only the windshield plate 60 without the cover 50 .

Also, in the aforementioned embodiment, an example in which the present invention is applied to a film manufacturing apparatus of a touch roll system using a touch roll is described. applicable to the present invention. In this case, the molding unit is equipped with the cover 50 and the downstream windshield 70 as the windshield, and does not include the upstream windshield 60 .

1: Film manufacturing device 10: Extrusion machine 11: Feed hopper 20: Forming unit 21: Basic Department 22: side wall 23: Bracket 24: magnet 30: Mold 31: spit out 41:Touch roller 411: Body Department 412: Small diameter department 42: casting roll 43,44: cooling roll 45: Peeling roller 50: cover 51: hinge 52: window 60: windproof board 61: Body Department 62: front end 621~623: 1st~3rd front end 63: Position adjustment mechanism 631: long hole 632: fastening member 64: Position adjustment mechanism 65: window 66:Hinge 70: windproof board 71: Body Department 72: front end 73: window 74:Hinge 80:Coiler 100: Resin 101: molten resin 102: resin film

[ Fig. 1 ] is an overall configuration diagram showing an example of a thin film manufacturing apparatus according to an embodiment of the present invention. [ Fig. 2 ] is a schematic cross-sectional view showing an example of a molding unit according to an embodiment of the present invention. [ Fig. 3 ] is a front view showing a molding unit according to an embodiment of the present invention, and a view showing a state in which a cover is opened.

20: Forming unit

21: Basic Department

30: Mold

31: spit out

41:Touch roller

42: casting roll

43,44: cooling roll

45: Peeling roller

50: cover

51: hinge

52: window

60: windproof board

61: Body Department

62: front end

65: window

66:Hinge

70: windproof board

71: Body Department

72: front end

73: window

74:Hinge

101: molten resin

102: resin film

Claims (13)

A manufacturing device for a resin film, which is equipped with a forming unit for forming resin into a film, and is characterized in that: The aforementioned forming unit has: a die, which extrudes the molten resin into a film; a casting roll disposed below the mold for cooling and solidifying the molten resin discharged from the outlet of the mold; a downstream side roll, which is arranged on the downstream side of the casting roll, and is in contact with the resin film cooled by the casting roll; an upstream windshield disposed on the upstream side of the aforementioned casting roll; and The downstream side windshield plate is arrange|positioned under the said casting roll or the said downstream side roll. The manufacturing apparatus of the resin film as claimed in item 1, wherein, The forming unit further includes a touch roller arranged to face the casting roll, and together with the casting roll, presses the molten resin discharged from the discharge port, The aforementioned windshield on the upstream side includes: The first upstream windshield plate is arranged on the upstream side of the aforementioned touch roller; and The second upstream windshield is disposed below the touch roller. The manufacturing apparatus of the resin film as claimed in item 2, wherein, The second upstream side windshield is supported so as to be tiltable on the base portion of the forming unit. The manufacturing apparatus of the resin film as claimed in item 3, wherein, The second upstream windshield plate is arranged below the center axis of the touch roller, or on the upstream side below the center axis of the touch roller, The aforementioned second upstream windshield can be tilted toward the upstream side, The rotation direction of the touch roller is the direction in which the lower part of the touch roller circles from the downstream side to the upstream side. The manufacturing apparatus of the resin film as claimed in item 2, wherein, The aforementioned second upstream windshield includes: the upstream body portion; and the upstream front end portion is disposed closer to the touch roller than the upstream body portion, The material constituting the upstream front end portion is different from the material constituting the upstream body portion, The upstream front end portion is made of a resin material. The manufacturing device of the resin film as claimed in item 5, wherein, The second upstream side windshield has a position adjustment mechanism capable of adjusting the relative position of the upstream front end portion to the upstream main body portion. The manufacturing apparatus of the resin film as claimed in item 2, wherein, The second upstream windshield plate has a convex portion corresponding to the small-diameter portion of the touch roller. The manufacturing apparatus of the resin film as claimed in item 2, wherein, The said 2nd upstream side windshield board has an upstream side window part which can see below the said touch roll and the said casting roll. The manufacturing apparatus of the resin film as claimed in item 1, wherein, The aforementioned downstream side rolls include: a cooling roll disposed on the downstream side of the casting roll for cooling the resin film; and a peeling roll that peels the resin film from the cooling roll, The said downstream windshield plate is arrange|positioned below the said cooling roll or the said peeling roll. The manufacturing device of the resin film as claimed in item 9, wherein, The said downstream side windshield board is supported so that it can fall on the base part of the said forming unit. The manufacturing device of the resin film as claimed in item 9, wherein, The aforementioned downstream side windshield includes: the downstream body portion; and a downstream front end portion disposed nearer to the downstream side roller than the downstream side main body portion, The material constituting the front end portion on the downstream side is different from the material constituting the main body portion on the downstream side, The downstream front end portion is made of a resin material. The manufacturing apparatus of the resin film as claimed in item 1, wherein, The said downstream side windshield board has a downstream side window part which can see below the said downstream side roller. A method for producing a resin film, characterized in that the resin film is produced by controlling the overall air flow in the forming unit by using the resin film production device according to any one of claims 1 to 12.

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