JP7275195B2 - RESIN FILM MANUFACTURING APPARATUS AND RESIN FILM MANUFACTURING METHOD - Google Patents

Description

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

As a method for producing a resin film, a T-die casting method, which is a type of melt extrusion method, is known. In the T-die casting method, the thickness of the resin film may be uneven due to shaking of the molten film in the area between the die and the cooling roll (hereinafter referred to as "air gap"). When such thickness unevenness occurs in the resin film, the uniformity of the thickness of the resin film is deteriorated, so when the resin film is used for optical purposes, the quality such as optical characteristics may be greatly affected. There is

In order to suppress such shaking of the molten film, in the resin film manufacturing apparatus of Patent Document 1, a control plate is provided above the nip roll, so that the air blown from the air blower for cooling the nip roll is directed to the nip roll. It prevents it from going around the air gap along the surface.

In addition, in the resin film manufacturing apparatus of Patent Document 2, by providing a pair of shielding plates covering both ends of the resin film in the width direction between the discharge port of the die and the surface of the cooling roll, This prevents the rising air current from hitting the molten film.

JP 2016-007803 A JP 2009-154518 A

By the way, when a resin film is being manufactured, the temperature of the die and rolls constituting the molding unit of the manufacturing apparatus is high, and the temperature of the resin film itself is also high during manufacturing. Therefore, inside the molding unit, the heat generated by such a high-temperature object generates a general air current, and this air current may cause the molten film to sway in the air gap. On the other hand, both of the above-mentioned Patent Documents 1 and 2 focus only on the local airflow in the molding unit, and do not consider the overall airflow generated in the molding unit as described above.

Accordingly, the present invention provides a resin film manufacturing apparatus and a resin film manufacturing method that can suppress the generation of unevenness in the thickness of the resin film by suppressing the generation of the overall air flow in the molding unit. intended to

The present inventors have found that the above objects can be achieved by suppressing the inflow of air from the outside of the forming unit to below the rolls, and have completed the present invention.

That is, according to the present invention, there is provided a resin film manufacturing apparatus comprising a molding unit for molding a resin into a film, wherein the molding unit includes a die for extruding the molten resin into a film, and a die disposed below the die. A cast roll that cools and solidifies the molten resin discharged from the discharge port of the die, and a downstream roll that is arranged downstream of the cast roll and contacts the resin film cooled by the cast roll. and an upstream windbreak plate arranged on the upstream side of the cast roll, and a downstream windbreak plate arranged below the cast roll or the downstream roll. be.

Further, in the resin film manufacturing apparatus of the present invention, the molding unit further includes a touch roll arranged to face the cast roll and pinching the molten resin discharged from the discharge port together with the cast roll. The upstream windbreak plate includes a first upstream windbreak plate arranged upstream of the touch roll and a second upstream windbreak plate arranged below the touch roll. You can stay.

Further, in the resin film manufacturing apparatus of the present invention, the second upstream windbreak plate may be tiltably supported by the base portion of the molding unit.

Further, in the resin film manufacturing apparatus of the present invention, the second upstream windbreak plate is disposed below the central axis of the touch roll or upstream of the central axis of the touch roll, and The second upstream windbreak plate may be tiltable toward the upstream side, and the rotation direction of the touch roll may be a direction in which the lower portion of the touch roll rotates from the downstream side to the upstream side.

Further, in the apparatus for producing a resin film of the present invention, the second upstream windbreak plate includes an upstream main body portion, an upstream tip portion disposed closer to the touch roll than the upstream main body portion, and a material forming the upstream tip portion may be different from a material forming the upstream body portion, and the upstream tip portion may be made of a resin material.

Further, in the resin film manufacturing apparatus of the present invention, the second upstream windbreak plate has a position adjustment mechanism capable of adjusting the relative position of the upstream tip portion with respect to the upstream body portion. may

In the resin film manufacturing apparatus of the present invention, the second upstream windbreak plate may have a convex portion corresponding to the small diameter portion of the touch roll.

Further, in the resin film manufacturing apparatus of the present invention, the second upstream windbreak plate may have an upstream window portion through which the bottom of the touch roll and the cast roll can be visually recognized.

Further, in the resin film manufacturing apparatus of the present invention, the downstream roll is arranged downstream of the cast roll, and includes a cooling roll for cooling the resin film and a peeling roll for peeling the resin film from the cooling roll. and a roll, and the downstream windbreak plate may be arranged below the cooling roll or the peeling roll.

Further, in the resin film manufacturing apparatus of the present invention, the downstream windbreak plate may be tiltably supported by the base portion of the forming unit.

Further, in the resin film manufacturing apparatus of the present invention, the downstream windbreak plate includes a downstream main body portion and a downstream tip portion disposed closer to the downstream roll than the downstream main body portion. A material forming the downstream tip portion may be different from a material forming the downstream body portion, and the downstream tip portion may be made of a resin material.

Further, in the resin film manufacturing apparatus of the present invention, the downstream windbreak plate may have a downstream window portion through which the lower side of the downstream roll can be visually recognized.

Further, according to the present invention, there is provided a resin film manufacturing method for manufacturing a resin film by controlling the overall generation of airflow in the molding unit by using any one of the manufacturing apparatuses described above.

According to the present invention, by suppressing the inflow of air from the outside of the forming unit to below the rolls by the upstream and downstream windbreak plates, it is possible to suppress the overall generation of air currents in the forming unit. Therefore, it is possible to suppress the occurrence of uneven thickness of the resin film.

FIG. 1 is an overall configuration diagram showing an example of a 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 in an embodiment of the invention. FIG. 3 is a front view showing the molding unit according to the embodiment of the present invention, showing a state in which the cover is opened.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is an overall block diagram showing an example of a film manufacturing apparatus 1 according to this embodiment, FIG. 2 is a schematic sectional view showing an example of a forming unit 20 according to this embodiment, and FIG. 3 is a front view showing the forming unit 20 according to this embodiment. FIG. 4 is a diagram showing a state in which the cover 50 is opened;

A film manufacturing apparatus 1 in this embodiment is an apparatus for manufacturing a resin film 102 . Applications of the resin film 102 manufactured by the film manufacturing apparatus 1 are not particularly limited, but optical applications can be exemplified. Further, specific examples of the resin constituting the resin film 102 are not particularly limited as long as they are thermoplastic resins, but examples include acrylic resins, polyolefin resins, polyester resins, polycarbonate resins, ABS resins, and the like. can. Among these, acrylic resin, polyethylene terephthalate (PET), polycarbonate (PC), cyclic olefin resin (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 winder 80, as shown in FIG.

The extruder 10 melts the resin 100 by feeding the resin 100 fed into the cylinder via the hopper 11 with a screw while heating the resin 100 . This 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.

The molding unit 20 is a unit that molds the molten resin 101 supplied from the extruder 10 into a film. The molding unit 20 includes a die 30, a touch roll 41, a cast roll 42, cooling rolls 43 and 44, and a peel roll 45, as shown in FIG. The number of cooling rolls is not particularly limited to the above, and can be arbitrarily set according to the type of resin constituting the resin film, and the cooling rolls may 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 from the ejection port 31 in the form of a film.

The five rolls 41 to 45 of the molding unit 20 are rotatably supported by a side wall 22 (see FIG. 3) erected on the base portion 21 of the molding unit 20, and rotated by a power transmission mechanism (not shown). configured to be drivable. These five rolls 41 to 45 are arranged in this order from the upstream side of the molding unit 20 to the downstream side. In this embodiment, "upstream side" and "downstream side" mean the direction in which the rollers are arranged corresponding to the conveying direction of the resin film, and in FIG. the front side of the unit 20), and the "downstream side" corresponds to the right direction on the paper surface (the rear side of the molding unit 20).

The touch roll 41 is a roll having a metal surface, and has a cooling mechanism that circulates a coolant inside the metal surface. On the other hand, the cast roll 42 is a metal roll having higher rigidity than the touch roll 41, and has a cooling mechanism for circulating a coolant inside. The touch roll 41 and the cast roll 42 are arranged below the discharge port 31 of the die 30 so as to face each other, and clamp and cool the molten resin 101 discharged from the discharge port 31 of the die 30. solidify.

In addition, the molding unit 20 may be provided with an air blow nozzle or a suction nozzle as described in the above-mentioned Patent Document 2. This blowing nozzle or suction nozzle is placed in the vicinity of the molten resin 101 located in the air gap AG (the area between the discharge port 31 of the die 30 and the cast roll 42) in a direction parallel or orthogonal to the molten resin 101. It forms an air flow that flows in the direction of

The cooling rolls 43 and 44 are metal rolls having a cooling function, like the cast roll 42 . The resin film 102 molded by the touch roll 41 and the cast roll 42 is conveyed to the cooling rolls 43 and 44 . The resin film 102 is cooled in multiple stages by passing through a cast roll 42 and two cooling rolls 43 and 44 .

The peeling roll 45 is a roll made of metal or resin. This peeling roll 45 peels off the resin film 102 from the most downstream cooling roll 44 . As shown in FIG. 1 , the resin film 102 peeled off by the peel roll 45 is carried out from the molding unit 20 and wound into a roll by the winder 80 . It should be noted that the resin film 102 peeled by the peeling roll 45 may be carried out to the stretching apparatus instead of the winder 80 .

Further, the molding unit 20 of this embodiment includes a cover 50 and windbreak plates 60 and 70, as shown in FIG. The cover 50 in the present embodiment corresponds to an example of the "first upstream windbreak plate" in the present invention, and the windbreak plate 60 in the present embodiment corresponds to an example of the "second upstream windbreak plate" in the present invention. , the windbreak plate 70 in this embodiment corresponds to an example of the "downstream windbreak plate" in the present invention.

The cover 50 is arranged upstream of the touch roll 41 . The cover 50 is provided at the front portion of the forming unit 20 so as to cover the area from the base portion 21 of the forming unit 20 to above the touch roll 41 . Also, the cover 50 is supported by the base portion 21 via hinges 51 so that the front portion of the molding unit 20 can be opened and closed.

The cover 50 also has a window 52 through which the inside of the molding unit 20 can be viewed. The window portion 52 is configured by fitting a transparent resin member into an opening formed in the cover 50 .

The upstream windbreak plate 60 is a plate-like member arranged below the touch roll 41 . The windbreak plate 60 partitions the space between the base portion 21 of the forming unit 20 and the touch roll 41 . The windbreak plate 60 has a main body portion 61 and a tip end portion 62 that is arranged closer to the touch roll 41 than the main body portion 61 is. A gap is ensured between the end of the tip portion 62 and the surface of the touch roll 41 , and the end of the tip portion 62 does not contact the surface of the touch roll 41 .

The body portion 61 is made of a metal material. On the other hand, the tip portion 62 is made of a resin material such as nylon or heat-resistant rubber. Even if the windbreak plate 60 contacts the touch roll 41 by some chance, damage to the touch roll 41 and the windbreak plate 60 can be suppressed by forming the tip portion 62 from a resin material.

A body portion 61 of the windbreak plate 60 has a window portion 65 through which the bottom of the touch roll 41 and the cast roll 42 can be viewed. The window portion 65 is configured by fitting a transparent resin member into an opening formed in the windbreak plate 60 .

As shown in FIG. 3 , the tip portion 62 of the windbreak plate 60 includes a first tip portion 621 , a second tip portion 622 and a third tip portion 623 . The first tip 621 is arranged in the center of the windbreak plate 60 . The second tip 622 is arranged outside the first tip 621 . The third tip portion 623 is arranged further outside the second tip portion 622 and constitutes both ends of the tip portion 62 . Here, the touch roll 41 has a body portion 411 including a portion that contacts the resin film 102 and small diameter portions 412 positioned at both ends of the body portion 411 and supporting the body portion 411 . The third tip portion 623 is arranged so as to correspond to the small diameter portion 412 of the touch roll 41 .

The first tip portion 621 is fixed to the main body portion 61 by a fixing member such as a bolt. Note that the first distal end portion 621 may be made relatively movable with respect to the main body portion 61 using a position adjusting mechanism, which will be described later.

On the other hand, the second distal end portion 622 is attached to the body portion 61 via the position adjusting mechanism 63 . The position adjusting mechanism 63 includes a long hole 631 formed in the second tip portion 622 along the vertical direction, and a round hole (not shown) formed in the body portion 61 so as to face the long hole 631 . , and a fastening member 632 such as a bolt inserted through the long hole 631 and the round hole. The position adjustment mechanism 63 allows the second tip portion 622 to move vertically relative to the body portion 61, thereby adjusting the size of the gap between the windbreak plate 60 and the touch roll 41. It is possible.

Similarly, the third distal end portion 623 is also attached to the body portion 61 via the position adjusting mechanism 64 . This position adjustment mechanism 64 has the same configuration as the position adjustment mechanism 63 described above. The position adjustment mechanism 64 allows the third tip portion 623 to move vertically relative to the body portion 61, thereby adjusting the size of the gap between the windbreak plate 60 and the touch roll 41. It is possible.

Also, the third tip 623 protrudes higher than the other tips 621 and 622 and forms a convex portion of the windbreak plate 60 . The convex portion is inserted into the small-diameter portion 412 of the touch roll 41 , and the airtightness between the base portion 21 of the forming unit 20 and the touch roll 41 by the windbreak plate 60 is enhanced.

Further, in this embodiment, as shown in FIG. 2, the windbreak plate 60 is supported by the base portion 21 of the molding unit 20 via a hinge 66 so that it can be tilted. By making the windbreak plate 60 foldable in this way, the maintenance inside the molding unit 20 is facilitated.

This windbreak plate 60 can be tilted toward the upstream side by a hinge 66 . On the other hand, the rotation direction of the touch roll 41 is the direction in which the lower portion of the touch roll 41 rotates from the downstream side to the upstream side, which is clockwise in FIG. That is, the tilting direction of the windbreak plate 60 coincides with the rotation direction of the touch roll 41 at the portion where the windbreak plate 60 and the touch roll 41 face each other. Therefore, even if the resin film 102 is wound around the touch roll 41 and the resin film 102 comes into contact with the windbreak plate 60 , the windbreak plate 60 falls down due to the hinge 66 , thereby causing the touch roll 41 and the windbreak plate to fall. 60 damage can be suppressed.

Further, as shown in FIG. 3, a bracket 23 is provided on the side wall 22 of the molding unit 20. As shown in FIG. This bracket 23 is fixed to the side wall 22 so as to protrude toward the inside of the molding unit 20 . Also, the brackets 23 are arranged so as to face both ends of the windbreak plate 60 . A magnet 24 is attached to the tip of this bracket 23 . The metal windbreak plate 60 is held by the magnet 24, and even if the resin film 102 wound around the touch roll 41 comes into contact with the windbreak plate 60, the windbreak plate 60 does not easily fall down. It is possible.

The installation position of the windbreak plate 60 is not particularly limited as long as it is below the touch roll 41. However, in order to allow the windbreak plate 60 to tilt upstream, the central axis CL ₀ of the touch roll 41 (Fig. 2 See) is preferably upstream rather than below. Moreover, from the viewpoint of avoiding contact between the windbreak plate 60 and the touch roll 41 , it is more preferable that the installation position of the windbreak plate 60 is directly below the central axis CL ₀ of the touch roll 41 .

The downstream windbreak plate 70 is a plate-like member arranged below the peeling roll 45 . The windbreak plate 70 partitions the space between the base portion 21 of the molding unit 20 and the peeling roll 45, as shown in FIG. Like the windbreak plate 60 on the upstream side, this windbreak plate 60 also has a main body portion 71 and a tip end portion 72 located closer to the peeling roll 45 than the main body portion 71 is. A gap is provided between the end of the tip portion 72 and the surface of the peeling roll 45 , and the end of the tip portion 72 does not contact the surface of the peeling roll 45 .

The body portion 71 is made of a metal material. On the other hand, the tip portion 72 is made of a resin material such as nylon or heat-resistant rubber. By configuring the tip portion 72 with a resin material, damage to the peeling roll 45 and the windbreak plate 70 can be suppressed even if the windbreak plate 70 accidentally contacts the peeling roll 45 .

A main body portion 71 of the windbreak plate 70 has a window portion 73 through which the lower portions of the cooling rolls 43 and 44 and the peeling roll 45 can be viewed. The window portion 73 is configured by fitting a transparent resin member into an opening formed in the windbreak plate 70 .

Further, in this embodiment, the windbreak plate 70 is supported by the base portion 21 of the forming unit 20 via a hinge 74, and is a foldable type that can be tilted. This downstream windbreak plate 70 can be tilted toward the downstream side by a hinge 74 from the viewpoint of maintainability in the molding unit 20 . Although not particularly shown, a bracket is provided on the side wall 22 of the forming unit 20 in the same manner as the windbreak plate 60 on the upstream side, and the windbreak plate 70 is held by a magnet attached to the tip of the bracket.

As with the windbreak plate 60 on the upstream side, the windbreak plate 70 may be formed with a convex portion corresponding to the shape of the peeling roll 45 . Further, the distal end portion 72 may be vertically movable relative to the main body portion 71 by a position adjusting mechanism.

In addition, the installation position of the windbreak plate ₇₀ is not particularly limited as long as it is below the peeling roll 45. See) is preferably downstream rather than below. From the viewpoint of avoiding contact between the windbreak plate 70 and the peeling roll 45 , it is more preferable that the installation position of the windbreaking plate 70 is immediately below the central axis CL ₁ of the peeling roll 45 .

Further, in the present embodiment, the downstream windbreak plate 70 is arranged below the peel roll 45, but the installation position of the downstream windbreak plate 70 may be below the roll on the downstream side of the touch roll 41. is not particularly limited. Specifically, the downstream windbreak plate 70 may be provided below any one of the cast roll 42 , the cooling roll 43 , or the cooling roll 44 . From the viewpoint of preventing the inflow of air into the molding unit 20 from the outside, it is preferable that the downstream windbreak plate 70 is arranged below the peeling roll 45 .

Here, as described above, the temperature of the resin film, the die, and the rolls is high during the production of the resin film. For this reason, in a film manufacturing apparatus having a conventional structure, the air below the rolls is sucked up through the gaps and spaces between the rolls by rising air currents generated by the heat emitted from these high-temperature objects, A large air current is generated in the forming unit, in which air is sucked from outside the forming unit to below the rolls.

A specific example of the gap between the rolls is the gap between the touch roll and the cast roll formed outside the resin film. Further, specific examples of the space between the rolls include the space formed between the small diameter portion of the touch roll and the small diameter portion of the cast roll, the space formed between the cast roll and the cooling roll, and the space between the cooling rolls. Spaces formed between and spaces formed between the chill roll and the peel roll can be mentioned.

In contrast, in the present embodiment, the cover 50 is provided in front of the forming unit 20, and the windbreak plate 60 is provided below the touch roll 41, so that outside air flows into the forming unit 20 from the front of the forming unit 20. restrained from doing. Similarly, by providing a windbreak plate 70 below the peeling roll 45 , it is possible to prevent outside air from flowing into the molding unit 20 from behind the molding unit 20 .

In this way, the cover 50 and the windbreak plates 60 and 70 prevent outside air from entering below the rolls 41 to 45 of the molding unit 20, thereby blocking the flow of air existing below the rolls 41 to 45. It is possible to suppress the sucking up by the rising air current caused by the high-temperature object. Therefore, it is possible to suppress the generation of global air currents in the molding unit 20, and it is possible to suppress the occurrence of shaking of the molten film in the air gap, so that the occurrence of unevenness in the thickness of the resin film can be suppressed. can.

Moreover, in the film manufacturing apparatus 1, the film manufacturing apparatus 1 may be operated with the cover 50 opened in order to check the condition inside the forming unit 20, maintain the rolls, and the like. Therefore, in this embodiment, both the cover 50 and the windbreak plate 60 are arranged upstream of the cast roll 42 to adopt a double windbreak structure. As a result, even when the film manufacturing apparatus 1 is operated with the cover 50 open, the windbreak plate 60 can prevent outside air from entering from the front of the forming unit 20 to below the rolls 41 to 45. Along with this, the windbreak plate 60 can also function as a safety cover.

It should be noted that the embodiments described above are described to facilitate understanding of the present invention, and are not described to limit the present invention. Therefore, each element disclosed in the above embodiments is meant to include all design changes and equivalents that fall within the technical scope of the present invention.

In the above-described embodiment, an example in which the present invention is applied to the film manufacturing apparatus 1 that manufactures the single-layer resin film 102 has been described, but the present invention is not particularly limited to this. For example, the present invention may be applied to a film manufacturing apparatus that manufactures multilayer resin films. Alternatively, the present invention may be applied to a film manufacturing apparatus that manufactures 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, although the molding unit 20 includes both the cover 50 and the windbreak plate 60 in the above-described embodiment, the present invention is not particularly limited to this. The molding unit 20 may have only the cover 50 and not the windbreak plate 60 . Alternatively, the molding unit 20 may have only the windbreak plate 60 and not the cover 50 .

Further, in the above-described embodiment, an example in which the present invention is applied to a touch roll type film manufacturing apparatus using a touch roll has been described, but the present invention is not particularly limited to this, and the present invention is applied to a so-called casting roll method that does not use a touch roll. Invention may be applied. In this case, the forming unit is equipped with the cover 50 and the downstream windbreak 70 as windbreaks, but not with the upstream windbreak 60 .

DESCRIPTION OF SYMBOLS 1... Film manufacturing apparatus 10... Extruder 11... Hopper 20... Molding unit 21... Base part 22... Side wall 23... Bracket 24... Magnet 30... Die 31... Discharge port 41... Touch roll 411... Body part 412... Small diameter part 42... Cast rolls 43, 44 Cooling roll 45 Peeling roll 50 Cover 51 Hinge 52 Window 60 Windbreak plate 61 Body 62 Tip
621 to 623 first to third tip portions 63 position adjusting mechanism
631... Slot
DESCRIPTION OF SYMBOLS 632... Fastening member 64... Position adjustment mechanism 65... Window part 66... Hinge 70... Windbreak plate 71... Body part 72... Tip part 73... Window part 74... Hinge 80... Winding machine 100... Resin 101... Molten resin 102... Resin the film

Claims (12)

A resin film manufacturing apparatus comprising a molding unit for molding a resin into a film,
The molding unit is
A die for extruding the molten resin into a film,
a cast roll arranged below the die for cooling and solidifying the molten resin discharged from the discharge port of the die;
A downstream roll disposed downstream of the cast roll and in contact with the resin film cooled by the cast roll;
an upstream windbreak plate arranged upstream of the cast roll;
a downstream windbreak plate disposed below the cast roll or the downstream roll;
A touch roll that is arranged to face the cast roll and presses the molten resin discharged from the discharge port together with the cast roll ,
The upstream windbreak plate is
a first upstream windbreak plate arranged upstream of the touch roll;
and a second upstream windbreak plate arranged below the touch roll.
The apparatus for producing a resin film according to claim 1 ,
The apparatus for manufacturing a resin film, wherein the second upstream windbreak plate is tiltably supported by the base portion of the forming unit.
The apparatus for producing a resin film according to claim 2 ,
The second upstream windbreak plate is arranged below the central axis of the touch roll or upstream of below the central axis of the touch roll,
The second upstream windbreak plate is tiltable toward the upstream side,
The apparatus for producing a resin film, wherein the rotating direction of the touch roll is a direction in which the lower portion of the touch roll rotates from the downstream side to the upstream side.
The apparatus for producing a resin film according to any one of claims 1 to 3 ,
The second upstream windbreak plate,
an upstream main body;
and an upstream tip portion located closer to the touch roll than the upstream body portion,
A material forming the upstream tip portion is different from a material forming the upstream body portion,
The apparatus for manufacturing a resin film, wherein the upstream end portion is made of a resin material.
The apparatus for producing a resin film according to claim 4 ,
The apparatus for manufacturing a resin film, wherein the second upstream windbreak plate has a position adjusting mechanism capable of adjusting a relative position of the upstream tip portion with respect to the upstream main body portion.
The apparatus for producing a resin film according to any one of claims 1 to 5 ,
The apparatus for manufacturing a resin film, wherein the second upstream windbreak plate has a convex portion corresponding to the small diameter portion of the touch roll.
The apparatus for producing a resin film according to any one of claims 1 to 6 ,
The apparatus for producing a resin film, wherein the second upstream windbreak plate has an upstream window through which the bottom of the touch roll and the cast roll is visible.
The apparatus for producing a resin film according to any one of claims 1 to 7 ,
The downstream roll is
a cooling roll arranged downstream of the cast roll for cooling the resin film;
a peeling roll for peeling the resin film from the cooling roll,
The apparatus for manufacturing a resin film, wherein the downstream windbreak plate is arranged below the cooling roll or the peeling roll.
The apparatus for producing a resin film according to claim 8 ,
The apparatus for manufacturing a resin film, wherein the downstream windbreak plate is tiltably supported by the base portion of the forming unit.
The apparatus for producing a resin film according to claim 8 or 9 ,
The downstream windbreak plate
a downstream main body;
a downstream tip located closer to the downstream roll than the downstream body,
The material forming the downstream tip portion is different from the material forming the downstream main body portion,
The apparatus for manufacturing a resin film, wherein the downstream end portion is made of a resin material.
The apparatus for producing a resin film according to any one of claims 1 to 10 ,
The apparatus for manufacturing a resin film, wherein the downstream windbreak plate has a downstream window through which the downward direction of the downstream roll is visible.
12. A resin film manufacturing method for manufacturing a resin film by using the manufacturing apparatus according to any one of claims 1 to 11 , by controlling the overall generation of airflow in the molding unit.

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