Manufacturing equipment for producing a microporous film

Abstract

To provide a producing facility of reduced size which enables the production of a film adaptable to a fast production speed.SOLUTION: A producing facility (2) comprises: an extruder (5) configured to melt-extrude a composition comprising at least one polymer and oil, so as to form an extruded film; a cooling device (6) configured to cool the extruded film; and a stretching system (8) configured to stretch the extruded film at least in a transverse direction, wherein the stretching system (8) comprises an oven (9) which is configured to heat the extruded film and which comprises an oven chamber in which the extruded film is intended to move in a moving direction. The oven (9) comprises in particular a steam injection device configured to inject steam into the oven chamber and towards the extruded film so as to remove oil from the extruded film.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to manufacturing equipment for producing a biaxially stretched microporous film such as a biaxially stretched microporous film for manufacturing a battery separator film.

Background Art

[0002] Manufacturing equipment for producing a biaxially stretched slightly porous film for a battery separator includes an extruder configured to melt-extrude a composition containing one or more polymers and oil so as to form an extruded film, a cooling device having a cooling cylinder, also called a casting cylinder, configured to cool the extruded film, a first stretching system configured to stretch the extruded film in the longitudinal and transverse directions, an oil extraction device configured to extract oil from the extruded film to form micropores in the extruded film, a second stretching system configured to stretch the extruded film in the transverse and / or longitudinal directions, a winding device configured to wind the extruded film onto a storage roller, and is known to have these continuously.

Summary of the Invention

Problems to be Solved by the Invention

[0003] Such manufacturing equipment is relatively long because, on the one hand, the manufacturing equipment is composed of a fairly large number of continuous elements, and on the other hand, the oil extraction device of such manufacturing equipment is also very long. In fact, considering that the extruded film is stretched longitudinally before entering the oil extraction device, the running speed of the extruded film in the oil extraction device is high, and it is necessary to lengthen the oil extraction device to surely remove most of the oil contained in the extruded film.

[0004] Furthermore, the width of the oil extraction device of such a manufacturing facility becomes relatively large in order to be able to receive an extruded film stretched laterally before entering the oil extraction device.

[0005] As a result, the aforementioned manufacturing facility becomes quite large, and a large floor area is required for installation.

[0006] The present invention aims to solve all or part of these problems.

[0007] Therefore, the fundamental technical problem of the present invention is to provide a manufacturing facility with a reduced size that enables the production of a film with improved mechanical properties and adaptable to high production speeds.

Means for Solving the Problems

[0008] For this purpose, the present invention relates to a manufacturing facility for manufacturing a microporous film such as a biaxially stretched microporous film, and this manufacturing facility includes: An extruder configured to melt-extrude a composition containing at least one polymer and oil so as to form an extruded film; A cooling device configured to cool the extruded film; A stretching system configured to stretch the extruded film at least in the lateral direction, the stretching system including a heating furnace having a heating furnace chamber configured to heat the extruded film and configured to move the extruded film in the moving direction; Furthermore, the heating furnace is characterized by having a steam injection device, particularly a steam injection device, configured to inject steam toward the extruded film into the heating furnace chamber so as to remove oil from the extruded film.

[0009] Due to such a configuration of the manufacturing equipment, more specifically, the presence of the steam injection device, steam can be injected into the extruded film in the heating furnace of the stretching system, thereby removing a large amount of oil contained in the extruded film. With these configurations, the length of the oil extraction device disposed upstream of the stretching system can be significantly shortened, and thus the volume of the manufacturing equipment can be significantly reduced. Further, with these configurations, all or at least most of the oil contained in the extruded film can be surely removed, and thus the mechanical properties of the manufactured film can be improved.

[0010] The manufacturing equipment may further have one or more of the following features, either alone or in combination.

[0011] According to one embodiment of the present invention, the steam injection device has a plurality of steam injection nozzles arranged along the moving direction.

[0012] According to one embodiment of the present invention, the steam injection nozzle is disposed in the heating furnace chamber.

[0013] According to one embodiment of the present invention, each steam injection nozzle has one or more steam outlet orifices.

[0014] According to one embodiment of the present invention, the plurality of steam injection nozzles includes a first set of upper steam injection nozzles disposed above the extruded film and directed to face the upper surface of the extruded film, and a second set of lower steam injection nozzles disposed below the extruded film and directed to face the lower surface of the extruded film.

[0015] According to one embodiment of the present invention, the heating furnace chamber has a film inlet disposed at a first end of the heating furnace chamber and a film outlet disposed at a second end of the heating furnace chamber.

[0016] According to one embodiment of the present invention, the heating furnace chamber has a stretching region, a preheating region disposed upstream of the stretching region, and a drying region disposed downstream of the stretching region.

[0017] According to an embodiment of the present invention, the preheating region, the stretching region, and the drying region are arranged continuously in the moving direction.

[0018] According to an embodiment of the present invention, the steam injection device is configured to inject steam into the stretching region.

[0019] According to an embodiment of the present invention, the heating furnace includes a suction device that is fluidly connected to the heating furnace chamber and is configured to suck air containing steam and oil present in the heating furnace chamber.

[0020] According to an embodiment of the present invention, the suction device has at least one suction orifice that opens into the heating furnace chamber.

[0021] According to an embodiment of the present invention, the heating furnace has an oil filter configured to filter the air sucked by the suction device.

[0022] According to an embodiment of the present invention, the suction device is fluidly connected to the steam injection device such that the air sucked by the suction device is at least partially re-injected into the heating furnace chamber via the steam injection device.

[0023] According to an embodiment of the present invention, the heating furnace has a steam generation chamber and a steam distribution circuit that fluidly connects the steam generation chamber to the steam injection device.

[0024] According to an embodiment of the present invention, the heating furnace has an injection device configured to inject water droplets or steam into the steam generation chamber. The injection device can be connected to, for example, a water or steam supply circuit. The water or steam supply circuit may optionally have a supply pump.

[0025] According to an embodiment of the present invention, the injection device has an injection opening that opens into the steam generation chamber.

[0026] According to one embodiment of the present invention, the heating furnace has a fan configured to send the steam generated in the steam generation chamber to the steam injection device.

[0027] According to one embodiment of the present invention, the heating furnace has an air supply passage that opens into the steam generation chamber and is configured to supply air to the steam generation chamber. The air supply passage preferably fluidly connects at least one suction orifice to the steam generation chamber.

[0028] According to one embodiment of the present invention, an oil filter is provided in the air supply passage.

[0029] According to one embodiment of the present invention, the heating furnace has a heating device configured to heat the internal volume of the steam generation chamber. The heating device is preferably disposed within the steam generation chamber.

[0030] According to one embodiment of the present invention, the heating device has a heat exchanger.

[0031] According to one embodiment of the present invention, the heating furnace is disposed upstream of the steam generation device and has a first warm air injection device configured to eject warm air toward the extrusion film in the heating furnace chamber so as to heat the extrusion film, and a second warm air injection device disposed downstream of the steam generation device and configured to eject warm air toward the extrusion film in the heating furnace chamber so as to dry the extrusion film.

[0032] According to one embodiment of the present invention, the first warm air injection device is configured to eject warm air toward the extrusion film within the preheating region so as to heat the extrusion film during movement within the preheating region, and the second warm air injection device is configured to eject warm air toward the extrusion film within the drying region so as to dry the extrusion film during movement within the drying region.

[0033] According to one embodiment of the present invention, the first and second warm air injection devices each have a plurality of warm air injection nozzles arranged along the moving direction.

[0034] According to an embodiment of the present invention, a plurality of hot air injection nozzles belonging to each of the first and second hot air injection devices include a first set of upper hot air injection nozzles arranged above the extrusion film and configured to face the upper surface of the extrusion film, and a second set of lower hot air injection nozzles arranged below the extrusion film and configured to face the lower surface of the extrusion film.

[0035] According to an embodiment of the present invention, the manufacturing facility has an oil extraction device configured to extract oil from the extrusion film so as to form micropores in the extrusion film, and the stretching system is arranged on the downstream side of the oil extraction device.

[0036] According to an embodiment of the present invention, the extract is a solvent, for example, an organic solvent.

[0037] According to an embodiment of the present invention, the oil extraction device has an extraction tank containing the extract, and the extrusion film is configured to be immersed in the extract while passing through the oil extraction device.

[0038] According to an embodiment of the present invention, the oil extraction device has a plurality of deflection rollers at least partially immersed in the extract.

[0039] According to an embodiment of the present invention, the manufacturing facility further has a stretching device configured to stretch the extrusion film in the longitudinal direction, and the stretching device is arranged upstream of the oil extraction device.

[0040] According to an embodiment of the present invention, the stretching system is configured to stretch the extrusion film in the longitudinal and transverse directions.

[0041] According to an embodiment of the present invention, the stretching system is configured to stretch the extrusion film simultaneously in the longitudinal and transverse directions.

[0042] According to an embodiment of the present invention, the manufacturing facility has a winding device disposed downstream of the stretching system and is configured to wind the biaxially oriented microporous film onto a storage roller.

[0043] According to an embodiment of the present invention, the cooling device has a cooling cylinder for cooling the extruded film.

[0044] According to an embodiment of the present invention, the cooling cylinder is disposed below the extrusion die of the extruder.

[0045] According to an embodiment of the present invention, the cooling device has a cooling tank containing a coolant, and the cooling cylinder is at least partially immersed in the coolant contained in the cooling tank.

[0046] According to an embodiment of the present invention, the cooling device has at least one deflection roller.

[0047] According to an embodiment of the present invention, the cooling device has two pressure rollers immersed in the coolant contained in the cooling tank. Advantageously, the two pressure rollers are rotationally driven so as to apply a tensile force to the extruded film.

[0048] According to an embodiment of the present invention, the stretching system has two stretching devices disposed on both sides of the extruded film, and each stretching device a guide rail, a plurality of clamps for gripping the same longitudinal edges of the film, the plurality of clamps being arranged along each guide rail and configured to be guided by each guide rail, an endless chain connected to each clamp and configured to drive each clamp along each guide rail, and has.

[0049] According to an embodiment of the present invention, each endless chain is deformable between a first state in which each clamp is positioned close to each other and a second state in which each clamp has moved away from each other.

[0050] According to one embodiment of the present invention, the guide rails of the two stretching devices extend at least partially into the heating furnace chamber.

[0051] According to one embodiment of the present invention, the guide rails of the two stretching devices are separated from each other in the stretching region.

[0052] According to one embodiment of the present invention, the guide rails of the two stretching devices extend substantially parallel to each other in the preheating region located upstream of the stretching region.

[0053] According to one embodiment of the present invention, the guide rails of the two stretching devices extend substantially parallel to each other in the drying region located upstream of the stretching region.

[0054] According to one embodiment of the present invention, the stretching system is configured such that each endless chain deforms between a first state and a second state within the stretching region. By configuring it in this way, it becomes possible to reliably perform longitudinal stretching or longitudinal relaxation of the film simultaneously with the transverse stretching of the film.

[0055] According to one embodiment of the present invention, the stretching system is configured such that each endless chain deforms between a first state and a second state within the drying region. By configuring it in this way, it becomes possible to reliably perform longitudinal stretching or longitudinal relaxation of the film after the transverse stretching of the film.

Brief Description of the Drawings

[0056]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

BEST MODE FOR CARRYING OUT THE INVENTION

[0057] The present invention will be better understood from the following description using the attached schematic diagrams showing two non-limiting embodiments of this manufacturing facility.

[0058] FIG. 1 shows a manufacturing facility 2 for manufacturing a biaxially stretched microporous film 3, such as a biaxially stretched microporous film 3 for manufacturing a battery separator film, having two substantially parallel longitudinal edges 4.

[0059] This manufacturing facility 2 successively is configured to melt-extrude a composition containing one or more polymers such as polyethylene and / or polypropylene and an oil such as paraffin oil, and is formed to form an extruded film composed of, for example, a mixture of 20% to 30% polymer and 70% to 80% oil, an extruder 5 such as a co-rotating twin-screw extruder, a cooling device 6 configured to cool the extruded film, an oil extraction device 7 configured to extract oil from the extruded film to form micropores in the extruded film, a stretching system 8 disposed downstream of the oil extraction device 7 and configured to stretch the extruded film in the longitudinal and transverse directions, a winding device 9 disposed downstream of the stretching system 8 and configured to wind the biaxially stretched microporous film 3 onto a storage roller, and has

[0060] According to the embodiment shown in FIG. 1, the cooling device 6 includes a cooling tank 6.1 containing a coolant such as water, and a cooling cylinder 6.2, also called a casting cylinder, which is partially immersed in the coolant contained in the cooling tank 6.1 and is disposed below the extrusion die 51 of the extruder 5.

[0061] The cooling device 6 may further include one or more deflection rollers 6.3 immersed in the coolant, and two pressure rollers 6.4 immersed in the coolant and rotationally driven to apply a tensile force to the extruded film.

[0062] The oil extraction device 7 more specifically includes an extraction tank 7.1 containing an extraction liquid such as an organic solvent that is immersed while the film passes through the oil extraction device 7. The oil extraction device 7 has a plurality of deflection rollers 7.2 immersed in the extraction liquid, and is advantageously configured to increase the passing time of the extruded film within the oil extraction device 7.

[0063] The stretching system 8 includes a heating furnace 9 configured to heat the extruded film. The heating furnace 9 has a heating furnace chamber 11 configured such that the extruded film moves in the moving direction D inside.

[0064] The heating furnace chamber 11 has a film inlet 11.1 disposed at a first end of the heating furnace chamber 11 and a film outlet 11.2 disposed at a second end of the heating furnace chamber 11. The heating furnace chamber 11 further has a preheating region 12 capable of heating the extruded film to a predetermined stretching temperature, a stretching region 13 where the extruded film is stretched, and a drying region 14 where the stretched film is stabilized, dried, and selectively drawn in. The preheating region 12, the stretching region 13, and the drying region 14 are advantageously arranged in order in the moving direction D.

[0065] The heating furnace 9 further has a steam injection device 15 configured to inject steam, particularly water vapor, into the stretching region 13 and toward the extruded film so as to remove oil from the extruded film. The steam injection device 15 preferably has a first set of upper steam injection nozzles 16 arranged above the extruded film and directed to face the upper surface of the extruded film, and a second set of lower steam injection nozzles 17 arranged below the extruded film and directed to face the lower surface of the extruded film. Each of the upper and lower steam injection nozzles 16, 17 includes one or more outlet orifices for allowing the steam to communicate with the stretching region as described above.

[0066] As shown in FIG. 2, the upper steam injection nozzles 16 are arranged in sequence along the moving direction D, and the lower steam injection nozzles 17 are also arranged in sequence along the moving direction D. Each upper steam injection nozzle 16 is arranged to face the lower steam injection nozzle 17.

[0067] The heating furnace 8 further has a steam generation circuit configured to generate steam and supply the steam to the steam injection device 15.

[0068] The steam generation circuit has a steam generation chamber 18 and a steam distribution circuit 19 that fluidly connects the steam generation chamber 18 to the steam injection device 15. The steam distribution circuit 19 has, for example, a first steam distribution path 19.1 that fluidly connects the steam generation chamber 18 to the upper steam injection nozzles 16 and a second steam distribution path 19.2 that fluidly connects the steam generation chamber 18 to the lower steam injection nozzles 17.

[0069] Further, the steam generation circuit includes a heating device 21 arranged in the steam generation chamber 18 and configured to heat the internal volume of the steam generation chamber 18. The heating device 21 can be formed by, for example, a heat exchanger.

[0070] According to the illustrated embodiment, the steam generation circuit further has an injection device 22 configured to inject water droplets or steam into the steam generation chamber 18. The injection device 22 can be connected, for example, to a water or steam supply circuit (not shown). The injection device 22 preferably has an injection opening 22.1 that opens into the steam generation chamber 18 in the vicinity of the heating device 21.

[0071] As shown in FIG. 2, the steam generation circuit further has an air supply passage 23 that opens into the steam generation chamber 18 and is configured to supply air to the steam generation chamber 18. The heating device 22 is preferably configured to heat the air introduced into the steam generation chamber 18 via the air supply passage 23 and to heat the steam or water droplets introduced into the steam generation chamber 18 via the injection device 22.

[0072] Also, the steam generation circuit has a fan 24 configured to send the steam generated in the steam generation chamber 18 to the steam injection device 15.

[0073] According to the illustrated embodiment, the steam generation circuit further has a suction device 25 that is fluidly connected to the extension region 13 and is configured to suck the air taken in together with the steam into the oil present in the extension region 13. Preferably, the suction device 25 has a suction orifice 26 that opens into the extension region 13 and is connected to the steam generation chamber 18 via the air supply passage 23. As a result, the air sucked by the suction device 25 is re-injected into the extension region 13 via the steam injection device 15.

[0074] Preferably, the steam generation circuit has an oil filter 27 configured to filter the air sucked by the suction device 25. The oil filter 27 is disposed upstream of the steam generation chamber 18 and can be disposed, for example, in the air supply passage 23.

[0075] As shown in FIGS. 3 and 4, the heating furnace 8 further includes a first hot air injection device 28 disposed upstream of the steam injection device 15 and configured to eject hot air toward the extrusion film into the preheating region 12 so as to heat the extrusion film during movement within the preheating region 12, and a second hot air injection device 29 disposed downstream of the steam injection device 15 and configured to eject hot air toward the extrusion film into the drying region 14 so as to dry the extrusion film during movement within the drying region 14.

[0076] The first and second hot air injection devices 28 and 29 each include an upper hot air injection nozzle 31 and 32 disposed above the extrusion film and configured to face the upper surface of the extrusion film, and a series of lower hot air injection nozzles 33 and 34 disposed below the extrusion film and configured to face the lower surface of the extrusion film.

[0077] Advantageously, the heating furnace 8 includes a first hot air generation circuit 35 configured to generate hot air and supply the hot air to the first hot air injection device 28, and a second hot air generation circuit 36 configured to generate hot air and supply the hot air to the second hot air injection device 29.

[0078] The first hot air generation circuit 35 has a first heating chamber 37 and a first hot air distribution circuit 38 that fluidly connects the first heating chamber 37 to the first hot air injection device 28. The first hot air distribution circuit 38 may have, for example, a first hot air distribution path 38.1 that fluidly connects the first heating chamber 37 to the upper hot air injection nozzle 31 of the first hot air injection device 28, and a second hot air distribution path 38.2 that fluidly connects the first heating chamber 37 to the lower hot air injection nozzle 32 of the first hot air injection device 28.

[0079] The first hot air generation circuit 35 further has a first heating element 39 disposed within the first heating chamber 37 and configured to heat the internal volume of the first heating chamber 37. The heating element 39 can be formed, for example, by a heat exchanger.

[0080] Further, the first warm air generation circuit 35 includes a first air supply passage 41 that opens into the first heating chamber 37 and is configured to supply air to the first heating chamber 37, and a first fan 42 that is configured to send out the heated air in the first heating chamber 37 toward the first warm air injection device 28.

[0081] According to the embodiment shown in the figure, the first warm air generation circuit 35 further includes a first air suction device 43 that is fluidly connected to the preheating region 12 and is configured to suck air present in the preheating region 12. Advantageously, the first air suction device 43 has a first air suction orifice 44 that opens into the preheating region 12 and is connected to the first heating chamber 37 via the first air supply passage 41. Therefore, the air sucked by the first air suction device 43 is re-injected into the preheating region 12 via the first warm air injection device 28.

[0082] Similarly, the second warm air generation circuit 36 includes a second heating chamber 45, a second heating element 46 disposed in the second heating chamber 45 and configured to heat the internal volume of the second heating chamber 45, a second warm air distribution circuit 47 that fluidly connects the second heating chamber 45 to the second warm air injection device 29, a second air supply passage 48 that opens into the second heating chamber 45 and is configured to supply air to the second heating chamber 45, and a second fan 49 that is configured to send out the heated air in the second heating chamber 45 toward the second warm air injection device 29.

[0083] The second warm air generation circuit 36 further includes a second air suction device 51 that is fluidly connected to the drying region 14 and is configured to suck air present in the drying region 14. Advantageously, the second air suction device 51 has a second air suction orifice 52 that opens into the drying region 12 and is connected to the second heating chamber 45 via the second air supply passage 48. As a result, the air sucked by the second air suction device 51 is re-injected into the drying region 14 via the second warm air injection device 29.

[0084] According to one embodiment of the present invention, the first and second hot air generation circuits 35, 36 may be provided with an air filter or an oil filter configured to filter the air respectively sucked by the first and second air suction devices 43, 51.

[0085] The stretching system 8 further has two stretching devices 53 arranged on both sides of the extruded film 3.

[0086] As shown in detail in FIGS. 5 and 6, each stretching device 53 has a guide rail 54 that extends at least partially within the heating furnace chamber 11 and turns towards the film 3, having a first guide surface and a second guide surface facing the first guide surface, a plurality of clamps 55 for gripping the corresponding longitudinal edges 4 of the film 3, the clamps 55 being configured to be guided in the translational direction by the guide rail 54 respectively, a holding rail 56 that extends along each guide rail 54 and has a support surface turned towards each guide rail 54 and a holding surface facing the support surface, a plurality of guide elements 57 arranged along the holding rail 56 and configured to be guided in the translational direction by the holding rail 56, an endless chain 58 configured to drive each clamp 55 along each guide rail 54 and drive each guide element 57 along each holding rail 56, the endless chain 58 being deformable between a first state (see FIG. 5) where the clamps 55 are arranged close to each other and a second state (see FIG. 6) where the clamps 55 are moved away from each other, and has.

[0087] As shown in detail in FIG. 1, the guide rails 54 of the two stretching devices 53 extend substantially parallel to each other in the preheating region 12, are separated from each other in the stretching region 13, and extend substantially parallel to each other in the drying region 14. With such a configuration of the guide rail 54, in particular, the extruded film can be reliably stretched laterally in the stretching region 13.

[0088] Advantageously, the stretching system 8 is configured such that each endless chain 58 deforms from the first state to the second state within the stretching region 13. By configuring it in this way, it is possible to reliably perform the longitudinal stretching of the film and the transverse stretching of the film simultaneously. Such deformation of each endless chain 58 can be realized by reducing the distance between the guide rail 54 and the holding rail 56 of each stretching device 53.

[0089] Also, the stretching system 8 is configured such that each endless chain 58 deforms from the second state to the first state in the drying region 14. By configuring it in this way, it is possible to reliably relax the longitudinal direction of the film during the final drying, that is, after the transverse and longitudinal stretching of the film. Such deformation of each endless chain 58 can be achieved by increasing the distance between the guide rail 54 and the holding rail 56 of each stretching device 53.

[0090] Therefore, the manufacturing facility 2 according to the first embodiment of the present invention preheats the extruded film by injecting hot air into the extruded film through the first hot air injection device 28 while the extruded film passes through the preheating region 12, and stretches the extruded film in the longitudinal and transverse directions while the extruded film passes through the stretching region 13. By injecting steam into the extruded film through the steam injection device 15, the oil contained in the extruded film is removed while the extruded film passes through the stretching region 13. By injecting hot air into the extruded film through the second hot air injection device 29, the extruded film is dried and stabilized while passing through the drying region 14, and finally, the film can be relaxed in the longitudinal direction while passing through the stretching region 13.

[0091] FIG. 7 shows a manufacturing facility 2 according to a second embodiment of the present invention, which is essentially different from the first embodiment shown in FIGS. 1 to 6 in that the stretching system 8 is configured to stretch the film only in the transverse direction. This manufacturing facility 2 further has a stretching device 59 disposed upstream of the oil extraction device 7 and configured to stretch the extruded film in the longitudinal direction. The stretching device 59 may have, for example, a plurality of stretching cylinders with different rotational speeds.

[0092] According to an embodiment of the present invention not shown, the manufacturing facility 2 is not provided with an oil extraction device, and the steam injection device 15 is configured to inject a mixture of steam and a degreasing agent in the stretching region 13 toward the extrusion film to remove the oil content contained in the extrusion film.

[0093] Needless to say, the present invention is not limited to one embodiment of the manufacturing facility described as an example, but rather includes all modifications thereof.

Claims

1. Manufacturing equipment (2) for manufacturing a microporous film, comprising: An extruder (5) configured to melt-extrude a composition containing at least one polymer and oil to form an extruded film; A cooling device (6) configured to cool the extruded film; A stretching system (8) configured to stretch the extruded film at least in the transverse direction, the stretching system (8) comprising a heating furnace (9) having a heating furnace chamber (11) configured to heat the extruded film and configured to move the extruded film in the moving direction; Furthermore, the heating furnace (9) has a steam injection device (15) configured to inject steam toward the extruded film in the heating furnace chamber (11) so as to remove oil from the extruded film; An oil extraction device (7) configured to extract oil from the extruded film and form micropores in the extruded film, the stretching system (8) being arranged downstream of the oil extraction device (7); The oil extraction device (7) has an extraction tank (7.1) containing an extraction liquid, and the manufacturing equipment (2) is characterized in that the extruded film is configured to be immersed in the extraction liquid while passing through the oil extraction device (7).

2. In the manufacturing equipment (2) of Claim 1, The manufacturing equipment (2) in which the steam injection device (15) has a plurality of steam injection nozzles (16, 17) arranged along the moving direction (D).

3. In the manufacturing equipment (2) of Claim 2, The manufacturing equipment (2) having a first set of upper steam injection nozzles (16) arranged above the extruded film and directed to face the upper surface of the extruded film and a second set of lower steam injection nozzles (17) arranged below the extruded film and directed to face the lower surface of the extruded film.

4. In any one of the manufacturing equipment (2) of Claims 1 to 3, The heating furnace chamber (11) has a stretching region (13), a preheating region (12) located upstream of the stretching region (13), and a drying region (14) located downstream of the stretching region (13).

5. In the manufacturing equipment (2) of Claim 4, The manufacturing equipment (2) in which the steam injection device (15) is configured to inject steam into the stretching region (13).

6. In any one of the manufacturing equipment (2) of Claims 1 to 5, A manufacturing facility (2) in which a heating furnace (9) is fluidly connected to a heating furnace chamber (11) and has a suction device (25) configured to suck air containing vapor and oil present in the heating furnace chamber (11).

7. In the manufacturing facility (2) according to claim 6, A manufacturing facility (2) in which the suction device (25) is fluidly connected to a vapor injection device (15) such that air sucked by the suction device (25) is at least partially re-injected into the heating furnace chamber (11) via the vapor injection device (15).

8. In any one of the manufacturing facilities (2) according to claims 1 to 7, The heating furnace (9) is arranged upstream of the vapor injection device (15) and has a first warm air injection device (28) configured to inject warm air toward the extruded film into the heating furnace chamber (11) so as to heat the extruded film, and a second warm air injection device (29) arranged downstream of the vapor injection device (15) and configured to inject warm air toward the extruded film into the heating furnace chamber (11) so as to dry the extruded film. A manufacturing facility (2).

9. In any one of the manufacturing facilities (2) according to claims 1 to 8, An oil extraction device (7) having a plurality of deflection rollers (7.2) at least partially immersed in the extraction liquid. A manufacturing facility (2).

10. In any one of the manufacturing facilities (2) according to claims 1 to 9, Further having a stretching device (59) configured to stretch the extruded film in the longitudinal direction, and the stretching device (59) is arranged upstream of the oil extraction device (7). A manufacturing facility (2).

11. In any one of the manufacturing facilities (2) according to claims 1 to 9, A manufacturing facility (2) in which a stretching system (8) is configured to stretch the extruded film in the longitudinal and transverse directions.

12. In the manufacturing facility (2) according to claim 11, A manufacturing facility (2) in which the stretching system (8) is configured to stretch the extruded film in the longitudinal and transverse directions simultaneously.

Images