Injection molding device

Abstract

The present invention relates to a casting apparatus 14 and a resin thin film manufacturing apparatus 10. [Solution] The casting apparatus 14 comprises a cooling roll 142, a separation roll 144, and a water bath 150. The cooling roll 142 cools the molten resin on its surface to produce a thin resin film F. The separation roll 144 is positioned downstream of the cooling roll 142 and peels the thin resin film from the cooling roll 142. Since at least a portion of the cooling roll 142 is positioned in the water bath 150, the peeling point P that separates the thin resin film from the cooling roll 142 is positioned above the water surface of the water bath 150. The cooling roll 142 has a roll width B K The separation roll 144 has a roll width B T It is equipped with a separation roll 144 with a roll width B T The roll width B of the cooling roll 142 K Smaller casting and thin-film manufacturing equipment.

Description

[Technical Field]

[0001] The present invention relates to a casting apparatus and a thin-film manufacturing apparatus corresponding to the casting apparatus. [Background technology]

[0002] During the production of resin thin films, the heated and extruded molten resin is supplied to a cooling roll, where it is cooled, and at least a portion of the molten resin partially solidifies (cast thin film). The extruded molten resin, i.e., the thin film, is usually thoroughly immersed in a water bath to cool before being supplied to the stretching device. Immersion in the water bath cools the molten resin uniformly and rapidly.

[0003] Typically, a device called a release roll separates the casting resin wound onto a cooling roll. After cooling, the resin is detached from the cooling roll and removed. A release roll located downstream of the cooling roll separates the casting film from the cooling roll. The separation point where the casting film is detached from the cooling roll is usually located above the water level. The film, separated from the cooling roll after passing through the water bath, is supplied to a stretching device such as a longitudinal and / or transverse stretching device or a simultaneous stretching device.

[0004] Since the separation point where the cast film peels off the cooling roll is above the water level in the water bath, conventional casting equipment ensures that the center of the cooling roll covered by the cast film remains dry. Because water in contact with the surface of the cooling roll accumulates between the cooling roll and the newly applied molten resin, ensuring that the center of the cooling roll remains dry is essential. Otherwise, contact with water can impair the quality of the film, and there is a risk of cracking during subsequent stretching processes. High-temperature molten resin can also evaporate water between the molten resin or the film and the cooling roll, and the resulting steam bubbles can damage or destroy the film.

[0005] A general trend in resin thin film manufacturing methods is to increase the manufacturing speed. This means increasing the surface speed of the cooling roll and release roll. In other words, the manufacturing speed can be increased through high rotational speed and / or large diameter rolls. Current thin film manufacturing equipment accelerates the cooling roll speed up to 120 m / min. After longitudinal stretching of the cast thin film, it is possible to manufacture a thin film of approximately 500 m to 600 m per minute. [Overview of the project] [Problems that the invention aims to solve]

[0006] For example, at a high production speed of 700 m / min, the cooling roll speed already reaches approximately 140 m / min to 150 m / min. Further increases in production speed (e.g., >800 m / min) will consequently lead to a corresponding increase in the cooling roll speed. In conventional casting equipment, the cooling roll and withdrawal roll already transport a sufficient amount of water at a cooling roll speed of >120 m / min. This water transport results in a significant amount of water splashing. The splashing is extremely strong, and the water, especially when it collides with the surface of the cooling roll, impairs the quality of the thin film as described above. [Means for solving the problem]

[0007] Accordingly, the object of the present invention is to provide an improved casting apparatus and thin film manufacturing apparatus that can produce thin films of good quality even at high production speeds (thin film output > 600 m / min or cooling roll speed > 120 m / min). The object of the present invention is achieved by the casting apparatus described in claim 1 and the apparatus described in the subsequent claims. Further features of the present invention will become apparent from the dependent claims and the following description. In particular, the object of the present invention is achieved by a casting apparatus for manufacturing resin thin films. The casting apparatus comprises at least one cooling roll, an extraction roll, and a water bath.

[0008] The cooling roll cools the molten resin extruded onto its surface to produce a resin thin film. The peeling roll disposed downstream of the cooling roll in the thin film conveyance direction A is separated from the cooling roll. The cooling roll is at least partially immersed in a water bath. The molten resin extruded onto the cooling roll is guided to the water bath by the cooling roll and cooled by the water bath. Also, the peeling point for separating the thin film from the cooling roll, i.e., the separation point, is set above the water surface line of the water bath and the cooling roll is disposed. Also, the peeling point for separating the thin film from the cooling roll can be arranged at the same level as the water surface line of the water bath or above the water surface line. If the peeling point for separating the thin film from the cooling roll is arranged above the water surface line of the water bath, the flow of water between the cooling roll and the thin film can be blocked.

[0009] The cooling roll has a roll width B K and the peeling roll has a roll width B T The roll width B of the cooling roll K is smaller than the roll width B of the peeling roll T and the following inequality holds: B K > B T The roll width B of the peeling roll T indicates the housing width of the peeling roll (measured in the roll axis direction) for guiding the molten resin or the thin film. For example, the shaft end or other parts of the peeling roll that function as bearings do not affect the roll width.

[0010] The reduced width of the peeling roll means a reduction in the amount of water scattered from the water bath by the peeling roll. A peeling roll narrower than the cooling roll sufficiently reduces the formation of scattered water. As a result, the amount of scattered water is reduced, and the thin film can be manufactured at a high production speed without endangering the quality of the thin film due to the scattered water. One feature of the present invention is to provide an extrusion nozzle for extruding the resin melt onto the surface of the cooling roll with an extrusion width B S in the casting device. The extrusion width B S indicates the minimum width of the cooling roll. For example, the width B of the cooling roll K is in the range of 100% - 120%, 105% - 115% or 108% - 112% of the extrusion width B S .

[0011] However, the roll width B of the peeling roll S can be reduced compared to the extrusion width B T . This reduction width is referred to as the shrinkage part (neck-in) of the extrusion process of the molten resin and the subsequent cooling process. The shrinkage part means the difference between the extrusion width B S and the film width B F when peeling the molten resin from the cooling roll. A certain shrinkage part usually occurs due to certain materials and process factors. The shrinkage part is affected by various factors including material properties, peeling speed (cooling roll speed), processing temperature, and extrusion process speed. In particular, the peeling ratio and the distance between the extrusion nozzle and the cooling roll are also important for the shrinkage part.

[0012] In a plurality of ordinary materials used for manufacturing the film, the shrinkage part is caused by the following factors: Low-density polyethylene (LDPE): 5 - 20% of the extrusion width High-density polyethylene (HDPE): 5 - 20% of the extrusion width Linear low-density polyethylene (LLDPE): 5 - 15% of the extrusion width Polypropylene (PP): 5 - 25% of the extrusion width Polyethylene terephthalate (PET): 5 - 20% of the extrusion width Polyvinyl chloride (PVC): 5 - 10% of the extrusion width Polystyrene (PS): 5 - 20% of the extrusion width Polyamide (PA): 5 - 15% of the extrusion width Ethylene vinyl acetate (EVA): 5 - 20% of the extrusion width

[0013] Therefore, the theoretical film width B F is calculated by the following formula: B F = B S - shrinkage part width In addition to the material, the shrinkage part is particularly affected by the melt viscosity of the film and the process temperature. The lower the viscosity of the material (or the higher the process temperature), the higher the shrinkage part.

[0014] High viscosities such as polyethylene terephthalate, polyamide or polyvinyl chloride generally have low reduction values, while low-viscosity melt materials such as linear low-density polyethylene, ethylene vinyl acetate or polystyrene have high reduction values. Peel roll width B T When selecting T , the reduction phenomenon can be considered. Therefore, the peel roll width B can be set in the range of 70% to 105%, 75% to 100% or 80% to 95% of the extrusion width T In particular, the peel width is set to the thin film width B F and only a very small number of roll side edges not covered by the thin film or a peel roll without roll side edges are provided, whereby the amount of water scattered and the amount of crown water with respect to the thin film can be dramatically reduced.

[0015] The casting device of the present invention achieves a high production speed. In particular, the cooling roll rotates at a surface speed of at least 120 m / min, at least 130 m / min, at least 140 m / min, at least 150 m / min or at least 160 m / min. In another feature of the present invention, the peel roll is coated with a polymer material containing rubber and / or at least one polyhalogenated olefin, particularly polytetrafluoroethylene. A hydrophobic material that reduces scattered water can be particularly used for the polymer material. If the hydrophobic material has a surface tension lower than that of water (72 mN / m) or a contact angle with respect to water exceeds 90°, a hydrophobic surface should be considered.

[0016] In the present invention, there is another feature that the height of the peel roll can be adjusted. The height adjustment of the peel roll is performed by determining whether the peel roll should be immersed in the water bath or to what depth in the water bath. Thereby, the amount of scattered water is controlled. The less the peel roll immersed in the water bath, the less the amount of water scattered.

[0017] A feature of the present invention is that the peeling roll is positioned completely above the water level of the water bath, and the peeling roll is not immersed in the water bath. This prevents water from splashing out of the peeling roll. The peeling roll can also be cooled internally. For example, the peeling roll can be cooled by passing cooling water or another cooling fluid through the peeling roll, especially through the housing of the peeling roll. This prevents overheating of the roll surface, especially when the peeling roll is hardly or never immersed in the water bath.

[0018] The peeling roll may be actively driven. A drive device is assigned to the peeling roll for the purpose of driving. The drive device can be controlled or adjusted so that the surface speed of the peeling roll corresponds to the surface speed of the cooling roll. This prevents stretching or compression of the thin film when peeling it from the cooling roll. The casting apparatus also includes a drainage device. In this invention, it is preferable to assign the drainage device to the cooling roll and to position the drainage device in the circumferential direction of the cooling roll after the peeling roll. Before the molten resin is extruded from the surface of the cooling roll to the surface of the cooling roll, the surface of the cooling roll is ensured to be completely waterless by the drainage device. The drainage device includes mechanical drainage elements such as a scraper, a water-removing wiper, or an extrusion roll.

[0019] Alternatively or additionally, the drainage device may be equipped with at least one water discharge nozzle for blowing away all water adhering to the surface of the cooling roll. The water discharge nozzle is designed in the form of an air knife. The casting device may be equipped with at least one water-retaining piece. The water-retaining piece is positioned adjacent to the housing surface of the cooling roll and facing the peeling roll. In particular, at least two water-retaining pieces may be provided. The peeling roll can be positioned between the two water-retaining pieces. By positioning at least one water-retaining piece in the area adjacent to the housing surface of the cooling roll, face-to-face contact between the housing surface of a cooling roll with a small roll width and the peeling roll can be avoided. In particular, a water-retaining piece may be positioned below where the thin film is peeled off.

[0020] In one embodiment of the present invention, the water-retaining piece has a lid positioned at a distance from the housing surface of the cooling roll, and a gap is formed between the housing surface of the cooling roll and the lid. For example, the width of the gap is in the range of 0.1 mm to 10 mm, 0.5 mm to 5 mm, or 1 mm to 3 mm. The lid prevents, for example, water droplets from falling from the cooling roll and reaching the free surface of the cooling roll (for example, a surface not covered with a thin film).

[0021] At least one water-retaining piece (especially a lid) is stretched over the cooling roll to more effectively retain water droplets. If necessary, the water-retaining piece (especially a lid) is placed over the front of the cooling roll to cover not only the surface of the housing but also a portion of the front of the housing to effectively prevent contact with water droplets.

[0022] In another feature of the present invention, at least one water-retaining piece contacts the housing surface of the cooling roll. The water-retaining piece and water come into contact above or below the water level. Contact with the water-retaining piece can reduce the amount of water splashing and water droplets. For example, contact is made by an elastic piece such as a rubber rim or a rolling roll. Thus, the water-retaining piece comprises an elastic piece such as a rubber rim or a rolling roll. If there is one or more rolling rolls, the rolling rolls are formed integrally with the rolling rolls or mounted on the same axis as the peeling rolls. In the integral mounting structure, the housing surface of the peeling rolls that guide the thin film is separated from the rolling rolls, for example by a circumferential groove and / or a different coating.

[0023] At least one water-retaining piece is equipped with an ejection nozzle, such as an air knife. The ejection nozzle ejects water spray from at least the edge region of the cooling roll. This objective is achieved by a thin-film manufacturing apparatus comprising at least one extruder and / or one reactor and the casting device. In the extruder, molten resin (e.g., polyethylene, polypropylene, polyethylene terephthalate, etc.) is fed to the extrusion nozzle and extruded onto the cooling roll.

[0024] A reactor is provided that produces a molten resin by polymerization. For this purpose, monomers (and selective additives such as catalysts) are mixed and polymerized in the reactor. The resulting polymerized molten resin is sent to an extrusion nozzle and extruded onto a cooling roll without the need for an additional extruder. The thin film manufacturing apparatus is located downstream of the casting apparatus and includes a stretching apparatus for stretching the thin film in the longitudinal and / or transverse directions. Longitudinal and transverse stretching can be performed simultaneously or sequentially. [Brief explanation of the drawing]

[0025] Embodiments of the present invention will be described in detail with reference to the attached drawings below. [Figure 1] Perspective view of a thin film manufacturing apparatus [Figure 2] Cross-sectional view of a casting device [Figure 3] Plan view of the casting machine [Figure 4] Other plan views of the casting apparatus [Modes for carrying out the invention]

[0026] Figure 1 is a perspective view of a thin film manufacturing apparatus 10 that manufactures thin film A, comprising various different devices and areas. In the illustrated example, the thin film manufacturing apparatus 10 comprises an extruder 12, a casting device 14, at least one longitudinal stretching device 16 (MDO, mechanical direction orienter), a transverse stretching device 18 (TDO, transverse direction orienter), an optional processing device 20, and a winding device 24.

[0027] Any processing apparatus 20 is a separation apparatus or an apparatus integrated with, for example, a winding apparatus 24. The extruder 12 has at least one extruder that generates molten resin from at least one starting product. The starting product includes, for example, granular resin, powdered resin, recycled resin, additives, etc. The at least one extruder is a single-screw extruder, a cascade extruder, a double-screw extruder, a planetary roller extruder, etc. Other mixing and processing apparatuses such as kneaders and dough kneaders can also be used.

[0028] Molten resin is supplied to the cooling roll 142 of the casting device 14 through an extrusion nozzle such as an opening mold 126 to form a thin film. The cooling roll 142 rotates at a speed of, for example, at least 120 m / min, at least 130 m / min, at least 140 m / min, at least 150 m / min, or at least 160 m / min. Molten resin is also produced by a polymerization reaction. For this purpose, monomers (and optional additives such as catalysts) are mixed and a polymer reaction occurs in the reactor and / or extruder. The polymerized molten resin is supplied directly to the cooling roll 142 of the casting device 14 via the extrusion nozzle 126 to produce a thin film F.

[0029] A uniform adhesion device 128 (Figure 2) is optionally provided, and the molten resin generated from the extrusion nozzle is precisely supplied to a cooling roll where it is fixed. The uniform adhesion device 128 includes, for example, a thickness-shaping device called an air knife and / or a pin-shaped electrode. In a precise application of the thickness-shaping device, the thin film will have a high-quality thin film surface even after cooling. The extruded thin film F comprises one or more layers. In the case of a multilayer thin film, many or all of the layers may be formed in one extruder, or each layer may be formed by a separate extruder.

[0030] After passing through the casting apparatus 14, the thin film F of the embodiment of this paragraph is supplied to the longitudinal stretching apparatus 16, where the thin film F is stretched in a first direction, i.e., the tensile direction A. After passing through the longitudinal stretching apparatus, the thin film (depending on the longitudinal stretch ratio, usually in the range of 3 to 5) has a thin film speed of, for example, at least 600 m / min, at least 700 m / min, or 800 m / min. Subsequently, a transverse stretching apparatus 18, for example, described in German Patent Application Publication No. 102021128332A1, comprises a heating furnace 30 having various temperature ranges for controlling the temperature of the thin film F along the normal direction of movement of the thin film manufacturing apparatus 10, i.e., the drawing direction. In the heating furnace 30, the thin film F is stretched in the transverse direction, i.e., transverse to the tensile direction A, in an existing manner. Thus, it is possible to manufacture uniaxially oriented (stretched) or biaxially oriented (stretched) thin films.

[0031] Instead of the longitudinal stretching apparatus 16 that performs longitudinal stretching and the transverse stretching apparatus 18 that performs transverse stretching, a simultaneous stretching apparatus can also be used, which allows the thin film to be stretched simultaneously in both the longitudinal and transverse directions. For example, the processing apparatus 20 is an apparatus that performs corona treatment on the surface of the thin film F to ensure good adhesion of metal. The resulting thin film F can be wound up using the winding apparatus 24, which is the final apparatus in the drawing direction A. The winding apparatus 24 has a winding core for winding the thin film F.

[0032] Figure 2 shows an enlarged view of the casting apparatus 14. The illustrated casting apparatus 14 comprises an opening mold 126, a cooling roll 142, and a uniform adhesion device 128. The opening mold 126, positioned above the cooling roll 142, continuously supplies molten resin to the cooling roll 142, which forms the thin film F. The molten resin is extruded to a width B S It is supplied as follows. The resins used are, in particular, polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), etc. Combinations of different resins can also be used. In particular, the thin film may consist of different resin layers and / or different resins co-extruded into a single layer.

[0033] The thin film F is evenly applied to the cooling roll 142 by the uniform application device 128. The cooling roll 142 rotates counterclockwise (R direction) in Figure 2. In the illustrated exemplary embodiment, after the cooling roll 142 has rotated approximately three-quarters of a turn, the resulting thin film F is finally removed from the cooling roll 142, cooled, and supplied to the stretching devices 16 and 18. During the cooling of the molten resin, a shrinkage process (neck-in formation process) is performed depending on the material used. Therefore, the width of the thin film is reduced during cooling. S From thin film width B F (Figure 3) It decreases.

[0034] The casting apparatus 14 includes a peeling roll 144 having a plurality of deflection rolls 146, 147 located downstream, and the peeling roll 144 removes the thin film from the cooling roll 142. The deflection rolls 147 are provided on a tensioning device 148. The tensioning device 148 is provided as a pivot lever. The tension of the thin film F is set and regulated by the angular position of the pivot lever. As shown in the figure, the cooling roll 142 is placed in a first water bath to cool the extruded thin film F and the cooling roll 142. After the peeling roll 144 removes the extruded thin film F from the cooling roll 142, the deflection rolls 146, 147 guide the thin film F to another water bath to further cool the thin film F.

[0035] The peeling roll 144 can be partially placed in the water bath 150 by positioning the peeling point P, illustrated and illustrated, above the water surface. The peeling roll 144 can also be positioned outside the water bath, completely above the water level. In other embodiments of the present invention, it is preferable to cool the peeling roll 144. For this purpose, cooling water or other cooling fluid can be circulated around the peeling roll 144, particularly its housing. The peeling roll 144 can also be actively driven. For this purpose, a drive unit can be assigned to the peeling roll 144 (not shown). The peeling roll 144 can also be made height-adjustable. This allows the peeling roll 144 to be immersed (or not immersed) at different depths in the water bath 150.

[0036] Before supplying the thin film to the longitudinal, transverse, or simultaneous stretching devices 16, 18, the thin film can pass through the dewatering device 200. In the dewatering device 200, all water adhering to the thin film can be removed by blowing, mechanically wiping, and / or other means. The casting device 14 is equipped with a dewatering device 154. The dewatering device 154, assigned to the cooling device 142, is positioned in the circumferential direction R of the cooling roll 142 behind the release roll 144. The dewatering device 154 ensures that the surface of the cooling roll 142 is dehydrated before the molten resin is re-extruded onto the surface of the cooling roll 142.

[0037] Figure 3 shows a plan view of the casting apparatus 14. As shown in the figure, the cooling roll 142 has a roll width B KThe peeling roll 144 has a small roll width B T It has the following characteristics. In the illustrated example, the roll width B of the peeling roll 144. T The extrusion width B S The range is 70% to 100%, and the thin film width B F This is roughly equivalent to the following. The cooling roll 142 optionally has shaft ends 142c and 142d that support the cooling roll. Therefore, the peeling roll 144 has shaft ends 144a and 144b that support the peeling roll. The width is specified by the width of the housing surface of the roll that guides the molten resin or thin film (measured in the axial direction of the roll), so the peeling roll width is equal to the roll width B of the cooling roll. K Or the roll width B of the peeling roll T It does not affect.

[0038] In the illustrated exemplary embodiment, the water-retaining pieces 142a and 142b are positioned on the left and right sides of the peeling roll. The water-retaining pieces 142a and 142b shown in the embodiment of Figure 4 are optional. A water-retaining piece 142a with or designed as a lid (lid element) is positioned adjacent to the housing of the cooling roll 142 and on the front left side of the peeling roll 144. A water-retaining piece 142 with or designed as a lid is positioned adjacent to the housing surface of the cooling roll 142 and on the front right side of the peeling roll 144. The water-retaining pieces 142a and 142b prevent water droplets from reaching the exposed surface of the cooling roll.

[0039] As shown in the figure, the water-retaining pieces 142a and 142b extend to the left and right sides of each front of the cooling roll 142, overlapping at least partially with each front of the cooling roll 142. Figure 4 is a plan view of another housing device 14. This corresponds to the housing device from Figure 3, but without the water-retaining pieces. [Explanation of Symbols]

[0040] 10...Film F manufacturing apparatus, 12...Extruder, 14...Housing apparatus, 16...Longitudinal stretching apparatus, 18...Transverse stretching apparatus, 20...Processing apparatus, 24...Winding apparatus, 30...Heating furnace, 120...Extruder, 126...Opening die, 128...Uniform adhesion apparatus, 142...Cooling roll, 142a, 142b...Water retention piece, 142c, 142d...Shaft end, 144...Peeling roll, 144a, 144b...Shaft end, 146, 147...Bending roll, 148...Tensioning element, 150, 152...Water bath, 154...Water removal apparatus for cooling roll, 200...Water removal apparatus for thin film, A...Detachment direction, F...Thin film, R...Rotation direction, P...Peeling point,

Claims

1. It comprises a cooling roll (142), a separation roll (144), and a water bath (150), The cooling roll (142) cools the molten resin adhering to the surface of the cooling roll (142) to produce a thin resin film. The separation roll (144), positioned downstream of the cooling roll (142), separates the resin thin film from the cooling roll (142). At least a portion of the cooling roll (142) is placed in a casting apparatus (14) which is located in a water bath (150), The cooling roll (142) has a roll width (B K ) has a separation roll (144) with a roll width (B T ) has, Separation roll (144) Roll width (B T ) is the roll width (B) of the cooling roll (142). K A casting apparatus (14) characterized by being shorter than ).

2. The casting device (14) has an extrusion width (B S The system includes an extrusion nozzle (126) that pushes molten resin onto the surface of a cooling roll (142), The roll width (B T ) of the separation roll (144) is in the range of 70% to 105% of the extrusion width (B S ), in the range of 75% to 100% of the extrusion width (B S ), or in the range of 80% to 95% of the extrusion width (B S ). The casting device (14) according to claim 1.

3. The casting apparatus (14) according to claim 1, wherein the cooling roll (142) rotates at a surface speed of at least 120 m / min, at least 130 m / min, at least 140 m / min, at least 150 m / min, or at least 160 m / min.

4. The casting apparatus (14) according to claim 1, wherein the separation roll (144) is coated with rubber and / or a polymer material comprising at least one polyalogen olefin or polytetrafluoroethylene.

5. A casting apparatus (14) according to claim 1, which adjusts the height of the setting position of the separation roll (144).

6. The casting apparatus (14) according to claim 1, wherein the separation roll (144) is positioned well above the water surface of the water bath (150).

7. The casting apparatus (14) according to claim 1, wherein the peeling point (P) for separating the resin thin film (F) from the cooling roll (142) is set above the water surface of the water bath (150), at the same level as the water surface of the water bath (150), or below the water surface of the water bath (150).

8. The casting apparatus (14) according to claim 1, wherein the separation roll (144) is actively driven.

9. The casting device (14) further comprises a water removal device (154) assigned to the cooling roll (142), The casting apparatus (14) according to claim 1, wherein the water removal device (154) is arranged in the circumferential direction of the cooling roll (142) that has passed through the separation roll (144).

10. The casting device (14) is equipped with at least one water-retaining piece (142a, 142b) The casting apparatus (14) according to claim 1, wherein the water-retaining pieces (142a, 142b) are arranged near the surface of the housing of the cooling roll (142) and in front of the separation roll (144).

11. The casting apparatus (14) according to claim 1, wherein at least one water-retaining piece (142a, 142b) protrudes beyond the front of the cooling roll (142).

12. The casting apparatus (14) according to claim 11, wherein at least one water-retaining piece (142a, 142b) overlaps with at least a portion of the front surface of the cooling roll (142).

13. The casting apparatus (14) according to claim 1, wherein at least one water-retaining piece (142a, 142b) is equipped with a jet nozzle for ejecting water flowing in from the edge region of the cooling roll (142).

14. The system comprises at least one extruder (12) and / or one reactor and a casting apparatus (14) according to any one of claims 1 to 13. An apparatus (10) for manufacturing a resin thin film (F), characterized in that an extruder (12) or reactor supplies molten resin to an extrusion nozzle (126).

15. A resin thin film (F) manufacturing apparatus (10) according to claim 14, comprising a stretching apparatus (16, 18) positioned downstream of a casting apparatus (14) for stretching the resin thin film (F) in the longitudinal and / or transverse directions.

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