Water drainage device

Abstract

The present invention relates to a dewatering device 200 for removing water and moisture from a thin film, a casting device 14 equipped with the dewatering device, and a thin film manufacturing apparatus equipped with a corresponding casting device. [Solution] The water removal device 200 has at least one mechanical water removal mechanism and first and second blowers, each having a plurality of ejection nozzles. The ejection nozzles 220a, 220c, 222a, and 222b eject an airflow toward the thin film, blowing away water and moisture along the thin film F across the side edges of the thin film.

Description

Technical Field

[0001] The present invention relates to a water removal device for removing water and moisture from a thin film, a casting device including the water removal device, and a thin film manufacturing device including the corresponding casting device.

Background Art

[0002] When manufacturing a thin resin film, when the resin film in a molten resin state is first extruded from an extruder and supplied to a cooling roll, the thin film is cooled by the cooling roll and at least partially condensed (cast thin film). The extruded thin film, that is, the cast thin film, is usually passed through water in a water bath for cooling and then supplied to a stretching device.

[0003] The thin film passing through the water bath is cooled quickly and uniformly, but it is necessary to remove the water and moisture adhering to the thin film before transporting the thin film to a stretching device, particularly a longitudinal stretching device. If a thin film containing moisture or water is supplied to a stretching device and the stretching process of the thin film is carried out, moisture evaporates from the thin film during the stretching process, causing problems. Therefore, the process of removing moisture in the thin film is important. That is, the longitudinal stretching device usually includes heating rolls, and the water remaining on the surface of the thin film evaporates on the high-temperature heating rolls of the longitudinal stretching device, generating steam bubbles or bubbles between the thin film and the heating rolls. Due to the generated steam bubbles or bubbles, the thin film separates from the surface of the heating roll, and the thin film is heated unevenly. This not only inhibits the uniform stretching of the thin film, deteriorates the quality of the obtained thin film, but may also cause problems such as cracks in the thin film.

[0004] In addition, when moisture evaporates on the heating roll, inorganic substances in the moisture elute, causing deashing, and residues such as white ink may be formed on the surface of the heating roll. Even if the deashed water is immersed in the water bath, the residues cannot usually be completely removed due to the evaporation of the deashed water. Even if the moisture on the surface of the heating roll is removed over a long time, the heating roll suffers permanent damage with unevenness formed on the surface due to the adherents. Moreover, mechanical cleaning of the heating roll forms scratches on the roll surface, resulting in the problem of deterioration of the quality of the generated thin film.

[0005] Even when known water removal devices are used to dry the thin film before supplying it to the stretching apparatus, the drying of the thin film may be insufficient. Known water removal devices are not suitable for the high production speeds currently required, for example, at least 140 m / min (measured with a cooling roll). This is because, at high production speeds, the thin film moves, pushing a large amount of water out of the water bath, while at the same time there is little time to remove the water adhering to the thin film. Especially at high production speeds, it is not possible to remove a sufficient amount of water from the thin film, and ultimately, the thin film is delivered to the stretching apparatus undesirably containing a large amount of water. [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] Accordingly, an object of the present invention is to provide an improved dewatering device for use in the production of thin films. The object of the present invention is solved by the dewatering device described in claim 1, the casting device described in the additional claim, and the thin film manufacturing device. Other features of the present invention will become apparent from the dependent claims and the following description. In particular, an object of the present invention is solved by a dewatering device for removing water from thin films. In particular, the dewatering device can be used in the manufacturing process of cast thin films. [Means for solving the problem]

[0007] The dewatering device of the present invention has a thin film inlet and a thin film outlet through which the thin film passes when guiding the thin film along the thin film passage. The thin film passage is the passage for the thin film moving through the dewatering device. In particular, the passage of the thin film is determined by the positioning of rolls such as deflection rolls, gripping rolls, and pressure rolls. Driven rolls or non-driven rolls are driven by the driving of the various rolls. Preferably, at least one driven roll that conveys the thin film through the dewatering device is provided.

[0008] The dewatering device comprises at least one mechanical water removal mechanism and at least a first blower and a second blower. Thus, water is removed from the surface of the thin film by two different methods, namely a mechanical method and a blowing physical method. In this way, even when the thin film moves through the manufacturing process at high speed, water and moisture can be removed at an extremely high speed. It is preferable to provide the blowing device downstream of the mechanical water removal mechanism, i.e., after the mechanical water removal mechanism in the direction of movement of the thin film.

[0009] The mechanical water removal mechanism comprises at least two pairs of water removal units, each positioned opposite to the other on either side of the thin film passage. For example, the first and second water removal units are both located on the upstream side of the thin film passage, but they hold and guide the thin film between them. Both water removal units apply a squeezing force to the thin film from the outside, mechanically removing water from the thin film.

[0010] The first mechanical water removal mechanism forms, for example, the first water removal stage of the water removal device. In the first water removal stage, the first mechanical water removal mechanism is positioned downstream of the inlet of the water removal device. A second mechanical water removal mechanism can optionally be provided downstream of the first mechanical water removal mechanism. The second mechanical water removal mechanism also has two water removal sections positioned opposite each other on both sides of the thin film passage. The two water removal sections are set to apply a squeezing force to the thin film. This squeezes out all the moisture remaining in the thin film, allowing the water to be mechanically removed from the outside of the thin film at a second position in the thin film passage, different from the first position.

[0011] The water removal section of the first water removal mechanism and / or the second water removal mechanism is formed, for example, as a squeezing roll. Each pair of squeezing rolls, arranged facing each other, forms a pair of squeezing rolls in the thin film passage through which the thin film passes. Mechanical water removal is performed by the pair of squeezing rolls. The squeezing rolls can be coated with an elastic material such as rubber, silicone, or thermoplastic polyurethane (TPU). In this way, the water squeezing effect can be enhanced.

[0012] Furthermore, a pair of stencil rolls comprises two pairs of stencil rolls of the same or different dimensions. The stencil rolls have diameters in the range of, for example, 100mm-200mm, 120mm-180mm, or 140mm-160mm. It has been found that a good water stenciling effect can be achieved with the stencil rolls.

[0013] Furthermore, at least one of the two pairs of throttling rolls of the first and / or second water removal mechanism can be actuated to an actuator. In particular, at least one of the throttling rolls in a pair can be actuated to an actuator. The actuator comprises a linear drive device or lever that oscillates the throttling roll. The actuator is used to adjust the throttling force and / or throttling angle of the throttling rolls relative to the thin film. The pair of throttling rolls not connected to the actuator are pressed against the other throttling roll, for example, by the elasticity of a spring.

[0014] The first blower of the water removal device used in the present invention comprises at least a first blower nozzle and at least a second blower nozzle. One or more first blower nozzles or one or more second blower nozzles are each arranged on the first side and / or second side of the thin film passage.

[0015] The second blower of the water removal device used in the present invention comprises at least a first blower nozzle and at least a second blower nozzle. One or more first blower nozzles and one or more second blower nozzles are each positioned on the first and / or second side of the thin film passage. The blower nozzles inject an airflow onto the thin film to blow away or dissipate water or moisture contained in at least one side edge of the thin film. Consequently, water or moisture contained in the center of the thin film is also blown away or dissipated from the left and / or right edge of the thin film.

[0016] The first blower and the first blower nozzle of the second blower are positioned on the first side of the thin film passage, so that water or moisture on the first side edge of the thin film is blown away or dissipated at two different locations. After passing through the second blower at the latest, the first side edge of the thin film is (almost completely) water-free or moisture-free, so this applies to the first blower and the second blower nozzle of the second blower, which are positioned at different locations on the second side edge of the thin film passage. At least one blower nozzle (or multiple or all blower nozzles) is assigned to a blower roll. The assigned blower roll is positioned on the opposite side of the blower nozzle (e.g., the opposite side of the thin film passage), and the thin film is supported in the area where water or moisture is blown away or dissipated by the blower nozzle. Thus, an airflow is ejected onto the thin film at a sufficiently high pressure and / or a sufficiently large flow rate, so that water or moisture on the thin film is effectively blown away and dispersed without permanently oriented or deforming the thin film.

[0017] At least one blower nozzle is a slot nozzle positioned substantially perpendicular to the transport direction of the thin film passage. The slot nozzle is positioned parallel to the lateral direction of the thin film passage. Alternatively, the slot nozzle can be set to an angle β with respect to the lateral direction of the thin film passage in the angular range of 1 to 45 degrees, 10 to 30 degrees, or 15 to 20 degrees.

[0018] The width of the slot nozzle is set to substantially cover the width of the entire thin film passage. It is also possible to provide multiple first (or second) blower nozzles on the blower. The slot nozzles can be arranged so that their side edge regions overlap to cover the entire thin film passage laterally. The blower nozzles can also be arranged sequentially in the direction of thin film transport.

[0019] At least one outlet gap is provided in the slot nozzle, which is configured so that the airflow is uniform or substantially laminar. This allows the airflow to move across the thin film, blowing or dissipating water or moisture from one or both sides of the thin film. For water or moisture removal, a lateral component can be added to the airflow, and the airflow can be ejected from the slot nozzle onto the thin film. The angle of the airflow relative to the thin film passage can be set in the angular range of 1 to 5 degrees or 2 to 4 degrees, thereby inclining the airflow with respect to the thin film passage. The inclination angle of the airflow can be achieved by the corresponding inclination of the slot nozzle and / or the corresponding design of the airflow outlet gap. The inclination achieves particularly effective blowing or dissipation of water or moisture.

[0020] The water removal device may include a left-edge blower and / or a right-edge blower positioned downstream of the first and second blowers. The left-edge blower and the right-edge blower are assigned to the left edge and right edge of the thin film, respectively. Each of the left-edge blower and the right-edge blower comprises a first side-edge blower nozzle and at least one second side-edge blower nozzle. The first and second side-edge blower nozzles are positioned at the first and second side edges of the thin film passage, with the second side edge located opposite the first side-edge blower nozzle. Thus, the first and second side-edge blower nozzles are positioned at substantially the same location on opposite sides of the thin film passage. The side-edge blowers blow airflow onto the corresponding thin film side edges. The resulting airflow does not move along the entire surface of the thin film, but only along its side edges, thus allowing all water or moisture adhering to the side edges of the thin film to be blown away or removed.

[0021] The water removal device may include at least one air drying and conditioning device. The air drying and conditioning device can generate an airflow of a predetermined humidity and / or temperature and supply the airflow to a first blower, a second blower, a left-edge blower and / or a right-edge blower. The air drying and conditioning device can supply air of different temperatures and humidityes to multiple different blowers or multiple air drying and conditioning devices, which are then allocated to each blower.

[0022] For example, the air drying and conditioning device supplies air at temperatures T1, T2, and T3 for which the following equation holds to the first blower, the second blower, and the side-edge blower, respectively: T1 <= T2 <= T3 This has the advantage that the thin film can already be (pre-)conditioned in the longitudinal stretching process and / or the transverse stretching process as usual.

[0023] In addition, the air drying and conditioning device is provided with a filter that supplies filtered air to the blower. Also, the first blower, the second blower, the left-side-edge blower, and / or the right-side-edge blower can be set to supply an air flow at a predetermined wind speed and / or a predetermined pressure.

[0024] For example, the second blower can supply an air flow at a higher speed and / or a higher pressure than the air flow supplied by the first blower. The air flow supplied by the side-edge blower can have an even increased pressure and / or an even increased flow rate. Also, the second blower can supply an air flow at a lower speed and / or a lower pressure than the air flow supplied by the first blower. The air flow supplied by the side-edge blower can also be supplied at a lower pressure and / or a lower speed.

[0025] In one embodiment of the present invention, the first blower supplies an air flow having a first pressure and a first flow rate. The first pressure is, for example, in the range of 0.5 bar to 1.1 bar or 0.6 bar to 0.8 bar. The first air flow rate range is, for example, 1000 m 3 / h to 1600 m 3 / h or 1200 m 3 / h to 1400 m 3 / h. The next second blower supplies a second air flow having a second pressure and a second flow rate, the second pressure being pressurized and the second flow rate being decreased. Due to the pressure and air flow rate distribution, most of the water or moisture on the thin film surface can be blown off or dissipated by the first blower. The remaining moisture or droplets can be removed (at high pressure) by the second blower.

[0026] The water draining device includes a device main body and at least one rotating part. Preferably, the water draining device has at least two rotating parts. At least one of the rotating parts is rotatably attached to the device main body so as to rotate between a first position where the water draining device is in an operating position and a second position where the water draining device is in a maintenance position. In the maintenance position, for example, the thin film can be inserted into the water draining device or removed from the water draining device after a failure such as the occurrence of a thin film crack. For this purpose, at least one rotating part can be separated from the device main body along the thin film passage.

[0027] Further, the water draining device has an air extractor configured to extract moist air from the housing of the water draining device. The ventilation efficiency of the water draining device can be further improved. The object of the present invention is achieved by a casting device including a cooling roll, a peeling roll, at least one water bath and a water draining device of the above type and manufacturing a resin thin film.

[0028] The cooling roll is configured to cool the molten resin extruded onto its surface to produce a thin film. The peeling roll arranged downstream of the cooling roll is configured to peel the thin film from the cooling roll. In particular, the cooling roll rotates so as to take out the thin film at a thin film speed of at least 120 m / min, at least 130 m / min, at least 150 m / min or at least 160 m / min.

[0029] At least one water bath is arranged so that the thin film in the casting device is guided through at least one water bath. For example, the cooling roll and any peeling roll are at least partially arranged in the water bath. As an alternative or additionally, the thin film can be guided (for example, via a corresponding deflection roll) through a water bath arranged downstream of the peeling roll. The water draining device can be arranged so that the thin film passes through the water draining device before exiting the casting device to remove water or moisture on the surface of the thin film.

[0030] Furthermore, the casting apparatus includes a water treatment device, particularly a decalcification device, for treating the water in at least one water bath. The decalcification device can remove impurities such as chalk and / or other residues from the water bath. In this way, the quality of the thin film can be improved.

[0031] Furthermore, the object of the present invention is achieved by a thin-film manufacturing apparatus comprising at least one molten metal generating device for generating molten resin and the casting device. The molten metal generating device comprises an extrusion nozzle and an extruder and / or reactor. In particular, the molten metal generating device is configured to extrude molten resin onto a cooling roll. The extruder is configured to supply molten resin (e.g., polyethylene, polypropylene, polyethylene terephthalate, etc.).

[0032] A reactor is provided to produce molten resin through a polymerization reaction. For this purpose, multiple monomers (and an arbitrary mixture such as a catalyst) are mixed and polymerized in the reactor. If the resulting polymerized molten resin is supplied to an extruder nozzle and extruded onto a cooling roll, an additional extruder is unnecessary. Furthermore, the thin film manufacturing apparatus is positioned downstream of the casting apparatus and includes a stretching device 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]

[0033] Embodiments of the present invention will be described in detail with reference to the attached drawings illustrating the following contents. [Figure 1] Perspective view of a thin film manufacturing apparatus [Figure 2] Cross-sectional view of a casting device [Figure 3] Perspective view of the drainage device [Figure 4] Cross-sectional view of the drainage device shown in Figure 3. [Figure 5] Perspective view showing a first modified example of a thin film water removal device. [Figure 6] Perspective view showing a second modified example of the thin film water removal device. [Modes for carrying out the invention]

[0034] Figure 1 is a perspective view of a thin film manufacturing apparatus 10 showing several different related devices and the relationships between them. The thin film manufacturing apparatus 10 shown exemplarily comprises an extruder 12, a casting apparatus 14, at least one longitudinal stretching apparatus 16 (MDO, "machine direction orienter"), a transverse stretching apparatus 18 (TDO, "transverse orienter"), an optional processing apparatus 20, and a winding apparatus 24. The optional processing apparatus 20 may include, for example, individual assemblies or apparatus assembled within the winding apparatus 24.

[0035] The extruder 12 includes at least one extruder 120 and / or a molten metal supply pipe from a reactor that produces molten resin of the starting material (product). The starting material is, for example, granular resin, resin powder, recycled resin, and / or a mixture thereof. At least one extruder 120 may be a single-screw extruder, a cascade extruder, a twin-screw extruder, a planetary roll extruder, etc. Other mixing and processing equipment, such as a kneader, may also be used.

[0036] Molten resin produced using an extrusion nozzle such as a wide-slot nozzle 126 is supplied to a cooling roll 142 of a casting apparatus 14 that manufactures a thin resin film F. Optionally, a so-called pressurizing device 128 is provided to accurately supply the molten resin discharged from the extrusion apparatus 12 to the cooling roll, and the molten resin hardens on the cooling roll 142. The pressurizing device 128 ensures that the thin film on the cooling roll 142 is uniformly cooled and forms a high-quality surface.

[0037] Multiple monomers (and any mixture such as a catalyst) produced in a molten resin by a polymerization reaction are mixed and polymerized in a reactor and / or extruder 120. Using an extrusion nozzle for producing thin films (e.g., a wide-slot nozzle 126), the polymerized molten resin obtained through the molten metal supply pipe 122 is supplied to the cooling roll 142 of the casting apparatus 14. The thin film F extruded onto the cooling roll 142 has one or more layers. When extruding a thin film F with multiple layers, it is possible to use an extruder 120 that produces multiple layers or all layers of thin films, or an extruder 120 that produces each layer.

[0038] After passing through the casting apparatus 14, the thin film F is supplied to an exemplary longitudinal stretching apparatus 16, where the thin film is stretched in a first direction, i.e., the transport direction, and expanded longitudinally. For example, an adjacent transverse stretching apparatus 18 disclosed in German Patent Application Publication No. 102021128332 comprises a heating furnace 30 having different regions for tempering the thin film F along the normal movement or drawing direction of the thin film manufacturing apparatus 10. In the heating furnace 30, the thin film F is stretched in a known manner transverse to the drawing direction A. This produces a uniaxially stretched or biaxially stretched thin film.

[0039] Instead of two different longitudinal stretching devices 16 and transverse stretching devices 18, a simultaneous stretching device that stretches in both the longitudinal and transverse directions simultaneously can also be used. For example, a processing device 20 that activates the surface of the thin film F through corona treatment can be used to achieve good metal adhesion surface treatment.

[0040] The winding device 24, which is the final device in the extraction direction A, performs the operation of winding the generated thin film F. The winding device 24 has a winding core for winding the thin film F. Figure 2 is an enlarged cross-sectional view of the casting device 14 (also called the cooling device). The illustrated casting device 14 includes a wide slot nozzle 126, a cooling roll 142, and a pressurizing device 128.

[0041] A wide slot nozzle 126 positioned above the cooling roll 142 continuously supplies molten resin to the cooling roll 142 to form the thin film F. The resin material used is similar to polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), etc. Different types of resin materials can also be mixed and used. In particular, thin films having different resin layers and / or multiple different resins can be extruded into a single layer.

[0042] The pressurizing device 128 allows the thin film F to be evenly pressed against the cooling roll 142. The cooling roll 142 rotates counterclockwise (rotational direction R), as shown in Figure 2. The thin film F produced in the illustrated embodiment is cooled and peeled off the cooling roll 142 after it has rotated approximately 3 / 4 of a turn, and then supplied to the stretching devices 16 and 18.

[0043] A peeling roll 144 is provided in the casting apparatus 14 to separate the thin film from the cooling roll 142, and a plurality of deflection rolls 146, 147 are arranged downstream of the peeling roll 144. The deflection rolls 147 are attached to a tensioning device 148 that applies tension to the thin film. The tensioning device 148 is formed as a rotatable lever. The tension on the thin film F is set or regulated by the swing angle position of the lever.

[0044] As shown in the figure, the cooling roll 142 is placed in a first water bath that cools both the extruded thin film F and the cooling roll 142. After the thin film F extruded from the cooling roll 142 passes through a peeling roll 144 that separates it from the cooling roll 142, the thin film F is guided by deflection rolls 146, 147 through a water bath 152 (or water bath 150) for further recooling.

[0045] Before stretching the thin film in the longitudinal, transverse, or simultaneous stretching apparatus 16, 18, water or moisture adhering to the thin film surface must be removed. Removal of water or moisture is necessary to avoid the adhesion of water or moisture to the stretching rolls due to evaporation of water or moisture, and to form the highest possible quality thin film. A thin film drying apparatus 200 for removing water or moisture from the thin film surface is illustrated in Figures 3 and 4.

[0046] Furthermore, the dewatering device 154 assigned to the cooling roll 142 removes all water or moisture adhering to the cooling roll 142, and the roll 142, which is substantially dried and cooled, also removes molten resin. For this purpose, the dewatering device 154 comprises at least one stripping device, at least one blower, and at least one blower nozzle (in particular, an air knife nozzle), etc.

[0047] Figure 3 shows a perspective view of the draining device 200, and Figure 4 shows a cross-sectional view of the draining device. The draining device 200 comprises a housing (device body) 202, a first rotating part 204, and a second rotating part 206. The first rotating part 204 and the second rotating part 206, which are pivotally attached to the housing 202, rotate between a first position and a second position, respectively. The draining device 200 is in an operating position and a maintenance position in the first and second positions, respectively. By rotating the first rotating part 204 and the second rotating part 206, the draining device 200 can be opened, allowing the thin film F to be inserted along the thin film passage.

[0048] In particular, as shown in the cross-sectional view of Figure 4, the housing 202 can be separated from both rotating parts 204 and 206 along the thin film passage. The first rotating part 204 can be rotated by a drive device, particularly a hydraulic drive device 204a. The second rotating part 206 can be rotated by a drive device, particularly hydraulic drive devices 206a and 206b.

[0049] In the illustrated embodiment, the thin film F is guided into the draining device 200 through the thin film inlet (bottom of Figure 3), and from there, the thin film F is guided along the thin film passage in the withdrawal direction A through the draining device 200. The thin film exits the draining device 200 from the thin film outlet (pointing to the rear right of Figure 3). A gripping roll 234, provided adjacent to the thin film outlet (Figure 4), is driven even after the device has stopped to pull the thin film through the draining device 200. A transverse cutting device 260 is also provided to cut the thin film laterally after it has passed through the thin film outlet.

[0050] The drainage device 200, shown in cross-sectional view in Figure 4, comprises a first mechanical water removal mechanism 210, a second mechanical water removal mechanism 212, a first blower 220, and a second blower 222, through which the thin film F passes. A side edge blower 250 is provided downstream of the second blower 222.

[0051] In the illustrated example, the first mechanical water removal mechanism 210 comprises a pair of squeezing rolls 210a and 210b positioned opposite each other on either side of the thin film passage. The pair of squeezing rolls 210a and 210b, positioned opposite each other, form squeezing rolls that squeeze the guided thin film F in pairs. In this way, mechanical water removal is performed.

[0052] The throttling roll 210b, which is attached to the lever 210c, is attached to the actuator 210d, and the throttling force and winding angle of the throttling roll 210b are adjusted by the operation of the actuator 210d. The throttling roll 210a is mounted biased by a spring that presses against the throttling roll 210b. In the illustrated embodiment, the second mechanical water removal mechanism 212 also includes a pair of throttling rolls 212a, 212b arranged opposite each other on both sides of the thin film passage. The opposing throttling rolls 212a, 212b form a pair of throttling rolls that guide the thin film F. Mechanical water removal is performed in this manner.

[0053] The throttling roll 212b, which is attached to the lever 212, is actuated to the actuator 212d. The throttling force and / or winding angle of the throttling roll 212b are adjusted using the actuator 212d. The throttling roll 212a is attached, biased by a spring that presses against the throttling roll 212b. The first blower 220, located downstream of the second mechanical water removal mechanism 212, comprises a first blower nozzle 220a located on the first side of the thin film passage and a second blower nozzle 220c located on the second side of the thin film passage. In this specification, the blower rolls 220b and 220d are positioned opposite the blower nozzles 220a and 220c, which form a slot nozzle (Figure 5). The blowing nozzles 220a and 220c eject an airflow toward the thin film F, blowing away or dissipating the water or moisture carried by the thin film F at at least one of its side edges (the left edge and / or the right edge).

[0054] The thin film F is guided to a second blower 222 by a deflection roll 230 driven by the transport of the thin film. The second blower 222 comprises a first blower nozzle 222a located on the first side of the blower passage and a second blower nozzle 222c located on the second side of the blower passage. In this specification, blower rolls 222b, 222d are positioned opposite the blower nozzles 222a, 222c which form a slot nozzle (Figure 5). The blower nozzles 222a, 222c are configured to generate an airflow toward the thin film F to blow away or dissipate any water or moisture remaining on at least one side edge of the thin film (left edge and / or right edge).

[0055] A structure can also be selected in which, after passing through the second blower 222, the thin film is guided through a side edge blower 250. Side edge blowers 250 can be provided on the left edge and right edge of the thin film, or on each side edge. The side edge blower 250 comprises a first side edge blower nozzle 250a located on the first side of the thin film passage, and at least one second side edge blower nozzle 250b located on the second side of the thin film passage, opposite to the first side edge blower nozzle 250a. The side edge blower 250 exclusively blows away water or moisture accumulating on the corresponding side edge of the thin film. The resulting airflow does not reach the entire thin film F, but acts only on the side edges of the thin film, so that water or moisture adhering to the side edges of the thin film can be removed and wiped away.

[0056] Figure 5 shows a perspective view of a blower equipped with a blower nozzle 220a, which is schematically shown as a slot nozzle having an air outlet gap 220s, for air drying of a thin film. The air outlet gap 220s is set to generate a uniform flow or substantially a laminar air flow L, thereby allowing an airflow to be ejected onto the thin film to remove and wipe away water or moisture from one or both side edges of the thin film.

[0057] Airflow L has a lateral airflow component L TAn airflow L is ejected from a slot nozzle onto the thin film F in such a manner. In particular, the airflow is ejected at an angle with respect to the thin film passage standard L1, and the angle α formed by the airflow L with respect to the thin film passage standard L1 is set to a range of 1° to 5°. Only solid arrows represent the airflow L in this specification. However, the airflow is ejected into the ejection region 225 along the entire width of the air outlet gap.

[0058] Figure 6 is a perspective view showing air drying of a thin film F using another blower equipped with a blower nozzle 220c. In this embodiment, the thin film F is conveyed upward. The conveying direction A is inclined at an angle Y with respect to the vertical direction G. In this way, water or moisture conveyed by the thin film can already be removed from the thin film by gravity. As a result, water or moisture that is difficult to remove from the thin film F is also removed by the airflow L. In addition, the blower nozzle 220c is positioned offset laterally from the thin film T by an angle β. The inclined arrangement of the blower nozzle and the blowing area 225 dry the side edge F of the thin film. R The water or moisture in the thin film can be dissipated and removed along this line. [Explanation of Symbols]

[0059] 10...Film F manufacturing equipment, 12...Extruder, 14...Casting equipment, 16...Longitudinal stretching equipment, 18...Transverse stretching equipment, 20...Processing equipment, 24...Winding equipment, 30...Heating furnace, 120...Extruder, 122...Molten metal supply pipe, 126...Wide slot nozzle, 128...Pressurizing device, 142...Cooling roll, 144...Peeling roll, 146, 147, 230...Deflection roll, 148...Tensioning device, 150, 152...Water bath, 154...Water removal device for cooling roll, 200...Water removal device for thin film, 202...Housing, 204, 206...Rotating parts, 204a, 206a, 206b...Drive devices, 210, 212... Mechanical water removal mechanism (pair of squeezing rolls), 210a, 210b, 212a, 212b... Squeezing rolls, 210c, 212c... Lever, 210d, 212d... Actuator, 220... First blower, 220a... Blower nozzle (first side edge), 220b, 220d, 222b, 222d... Blower roll, 220c... Blower nozzle (second side edge), 220s... Air outlet gap, 222... Second blower, 222a... Blower nozzle (first side edge), 222c... Blower nozzle (second side edge), 225... Blowing area, 234... Pinching roll, 250... Side edge blower, 250a, 250b... Blower nozzle, 260... Transverse cutting device, A... Conveying direction, F... Thin film, G... Vertical direction, T... Transverse direction, L... Airflow,

Claims

1. A dewatering device (200) that includes a thin film inlet for introducing a thin film and a thin film outlet for discharging a thin film, and removes water and moisture from a thin film guided along a thin film passage from the thin film inlet to the thin film outlet, A first mechanical water removal mechanism (210) having at least two water removal sections (210a, 210b) arranged opposite each other on both sides of the thin film passage and applying a throttling force to the thin film (F), It comprises a first blower (220) and a second blower (222), The first blower (220) comprises at least one first ejection nozzle (220a) located on the first side of the thin film passage and at least one second ejection nozzle (220c) located on the second side of the thin film passage. The second blower (222) comprises at least one first ejection nozzle (222a) located on the first side of the thin film passage and at least one second ejection nozzle (222c) located on the second side of the thin film passage. A water removal device (200) characterized in that the first and second ejection nozzles (220a, 220c) of the first blower (220) and the first and second ejection nozzles (222a, 222c) of the second blower (222) eject an airflow toward the thin film to blow away water and moisture from at least one side edge of the thin film (F) from the thin film (F).

2. The system includes a second mechanical water removal mechanism (212) located downstream of the first mechanical water removal mechanism (210), The dewatering device (200) according to claim 1, comprising a second mechanical water removal mechanism (212) having at least two water removal sections (212a, 212b) arranged opposite each other on both sides of the thin film passage and applying a throttling force to the thin film (F).

3. The water removal sections (210a, 210b, 212a, 212b) of the first and / or second mechanical water removal mechanisms (210, 212) are formed as squeezing rolls (210a, 210b, 212a, 212b), A water removal device (200) according to claim 1 or 2, wherein at least one squeezing roll (210b, 212b) of a first and / or second mechanical water removal mechanism (210, 212) is optionally driven and connected to an actuator (210d, 212d).

4. At least one nozzle (220a, 220c, 222a, 222c) of the first and second discharge nozzles (220a, 220c) of the first blower (220) and the first and second discharge nozzles (222a, 222c) of the second blower (222) is assigned to a blower roll (220b, 220d, 222b, 222d) that is positioned opposite to it. The dewatering device (200) according to claim 1, wherein the blower rolls (220b, 220d, 222b, 222d) support the thin film (F) in the region (225) ejected by the ejection nozzles (220a, 220c, 222a, 222c).

5. The draining device (200) according to claim 1, wherein the first and second at least one ejection nozzle (220a, 220c) of the first blower (220) and the first and second ejection nozzles (222a, 222c) of the second blower (222) are slot nozzles positioned substantially perpendicular to the thin film passage or have an angle β in the range of 1 to 45 degrees, 10 to 30 degrees, or 15 to 20 degrees with respect to the transverse direction (T).

6. The slot nozzle controls the airflow component (L) of the airflow (L). T A water removal device (200) according to claim 5, wherein the device directs an airflow (L) having a lateral direction (T) toward a thin film (F).

7. The system comprises at least one left-edge fan and a right-edge fan (250) located downstream of the first and second fans (220, 222), The draining device (200) according to claim 1, wherein the left edge blower is assigned to the left edge of the thin film, and the right edge blower is assigned to the right edge of the thin film.

8. A water draining device (200) according to claim 1, comprising an air dryer and / or air regulator that supplies air to a first blower (220), a second blower (222), a left edge blower and / or a right edge blower (250) to generate an airflow of predetermined humidity and / or temperature.

9. The draining device (200), the first blower (220), the second blower (222), the left edge blower and / or the right edge blower (250) are configured to supply airflow at a predetermined airflow rate and / or a predetermined pressure. The draining device (200) according to claim 1, wherein the second blower (222) supplies an airflow with a higher flow velocity and / or higher pressure than the airflow supplied from the first blower (220).

10. It comprises a housing (202) and at least one rotating part (204, 206), At least one rotating part (204, 206) is pivotally mounted to the housing (202) so as to rotate from a first position to a second position. The first position and the second position are the operating position and maintenance position of the draining device (200), respectively. The draining device (200) according to claim 1, wherein the housing (202) is separated from at least one rotating part (204, 206) along a thin film passage.

11. The draining device (200) according to claim 1, further comprising an intake device for drawing humid air from the housing of the draining device (200).

12. The device comprises a cooling roll (142), a peeling roll (144), at least one water bath (150, 152), and the water draining device (200) described in claim 1. The cooling roll (142) cools the molten resin extruded onto the surface of the cooling roll (142) to form a thin film (F). The peeling roll (144), positioned downstream of the cooling roll (142), removes the thin film (F) from the cooling roll (142). The thin film (F) is guided through at least one water bath (150, 152) within the casting apparatus (14), A casting apparatus (14) for manufacturing a resin thin film, characterized in that the thin film (F) passes through a dewatering device (200) before exiting the casting apparatus (14) to remove water and moisture from the surface of the thin film (F).

13. The casting apparatus (14) according to claim 12, comprising a decalcification apparatus of a water treatment apparatus for decalcifying the water of at least one water bath (150, 152).

14. In addition to the casting apparatus (14) described in claim 12, the apparatus comprises at least one apparatus for producing molten resin, An apparatus (10) for manufacturing a thin film (F), characterized in that an extruder (12) or reactor supplies molten resin and extrudes the molten resin onto a cooling roll (142).

15. The thin film (F) manufacturing apparatus (10) according to 14, characterized in that it is provided downstream of the casting apparatus (14) and comprises stretching apparatuses (16, 18) for stretching the thin film (F) in the longitudinal and / or transverse directions.

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