JP7712748B2 - Manufacturing equipment for producing microporous films - Google Patents

Description

The present invention relates to a manufacturing system for producing biaxially oriented microporous films, such as biaxially oriented microporous films for the manufacture of battery separator films.

The manufacturing equipment for producing biaxially stretched microporous films for battery separators includes:
an extruder configured to melt extrude a composition comprising one or more polymers and an oil 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 machine and transverse directions;
an oil extractor 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;
It is known that the

Such production plants are relatively long, on the one hand because they consist of a fairly large number of consecutive elements, and on the other hand because the oil extraction devices of such production plants are also very long. Indeed, taking into account that the extruded film is longitudinally stretched before entering the oil extraction device, the running speed of the extruded film in the oil extraction device is high, which requires a long oil extraction device to ensure that most of the oil contained in the extruded film is removed.

Furthermore, the width of the oil extraction equipment in such manufacturing facilities is relatively large to accommodate the extruded film that has been stretched laterally before entering the oil extraction equipment.

As a result, the manufacturing equipment mentioned above is quite large and requires a large amount of floor space to accommodate it.

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

Therefore, the underlying technical problem of the present invention is to provide a production facility of reduced size that enables the production of films with improved mechanical properties and that are suitable for high production speeds.

To this end, the present invention relates to a production system for producing a microporous film, such as a biaxially oriented microporous film, the production system comprising:
an extruder configured to melt extrude a composition comprising at least one polymer and an oil to form an extruded film;
a cooling device configured to cool the extruded film;
a stretching system configured to stretch the extruded film in at least a transverse direction, the stretching system including an oven configured to heat the extruded film and having an oven chamber configured to move in a direction of travel of the extruded film;
The oven is further characterized by having a steam injection device, in particular a water steam injection device, configured to inject steam into the oven chamber and towards the extruded film to remove oil from the extruded film.

Such configurations of the production facility, and more particularly the presence of steam injection devices, allow steam to 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. These configurations allow a significant reduction in the length of the oil extraction device located upstream of the stretching system and therefore a significant reduction in the volume of the production facility. These configurations also allow the reliable removal of all or at least a large part of the oil contained in the extruded film, thus improving the mechanical properties of the produced film.

The manufacturing facility may further have one or more of the following features, either alone or in combination:

According to one embodiment of the present invention, the steam injection device has multiple steam injection nozzles arranged along the direction of movement.

According to one embodiment of the present invention, the steam injection nozzle is positioned within the furnace chamber.

According to one embodiment of the present invention, each steam injection nozzle has one or more steam exit orifices.

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

According to one embodiment of the present invention, the furnace chamber has a film inlet located at a first end of the furnace chamber and a film outlet located at a second end of the furnace chamber.

According to one embodiment of the present invention, the furnace chamber has a stretching zone, a preheating zone located upstream of the stretching zone, and a drying zone located downstream of the stretching zone.

According to one embodiment of the present invention, the preheating zone, the stretching zone, and the drying zone are arranged consecutively in the direction of movement.

According to one embodiment of the present invention, the steam injection device is configured to inject steam into the stretching region.

According to one embodiment of the present invention, the furnace includes a suction device fluidly connected to the furnace chamber and configured to suction steam and oil laden air present within the furnace chamber.

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

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

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

According to one embodiment of the present invention, the furnace has a steam generation chamber and a steam distribution circuit fluidly connecting the steam generation chamber to the steam injection device.

According to one embodiment of the present invention, the furnace comprises an injection device configured to inject water droplets or steam into the steam generation chamber. The injection device can be connected, for example, to a water or steam supply circuit. The water or steam supply circuit may optionally comprise a supply pump.

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

According to one embodiment of the present invention, the furnace has a fan configured to direct steam generated in the steam generation chamber to the steam injection device.

According to one embodiment of the present invention, the furnace has an air supply passage opening into the steam generation chamber and 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.

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

According to one embodiment of the present invention, the furnace includes a heating device configured to heat an interior volume of the steam generation chamber. The heating device is preferably disposed within the steam generation chamber.

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

According to one embodiment of the present invention, the heating furnace has a first hot air ejection device arranged upstream of the steam generator and configured to eject hot air into the heating furnace chamber toward the extruded film to heat the extruded film, and a second hot air ejection device arranged downstream of the steam generator and configured to eject hot air into the heating furnace chamber toward the extruded film to dry the extruded film.

According to one embodiment of the present invention, the first hot air ejection device is configured to eject hot air toward the extruded film in the preheating zone to heat the extruded film while it is moving through the preheating zone, and the second hot air ejection device is configured to eject hot air toward the extruded film in the drying zone to dry the extruded film while it is moving through the drying zone.

According to one embodiment of the present invention, the first and second hot air ejection devices each have multiple hot air ejection nozzles arranged along the direction of movement.

According to one embodiment of the present invention, the multiple hot air ejection nozzles belonging to each of the first and second hot air ejection devices include a first set of upper hot air ejection nozzles arranged above the extruded film and configured to face the upper surface of the extruded film, and a second set of lower hot air ejection nozzles arranged below the extruded film and configured to face the lower surface of the extruded film.

According to one embodiment of the present invention, the manufacturing facility includes an oil extraction device configured to extract oil from the extruded film to form micropores in the extruded film, and the stretching system is disposed downstream of the oil extraction device.

According to one embodiment of the present invention, the extraction liquid is a solvent, e.g., an organic solvent.

According to one embodiment of the present invention, the oil extraction apparatus has an extraction tank containing an extraction liquid, and is configured so that the extruded film is immersed in the extraction liquid while passing through the oil extraction apparatus.

According to one embodiment of the present invention, the oil extraction device has a number of deflection rollers that are at least partially immersed in the extraction liquid.

According to one embodiment of the present invention, the production facility further comprises a stretching device configured to stretch the extruded film in the longitudinal direction, the stretching device being positioned upstream of the oil extraction device.

According to one embodiment of the present invention, the stretching system is configured to stretch the extruded film in both the longitudinal and transverse directions.

According to one embodiment of the present invention, the stretching system is configured to simultaneously stretch the extruded film in the machine and cross directions.

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

According to one embodiment of the present invention, the cooling device has a cooling cylinder for cooling the extruded film.

According to one embodiment of the present invention, the cooling cylinder is positioned below the extrusion die of the extruder.

According to one embodiment of the present invention, the cooling device has a cooling tank containing a cooling liquid, and the cooling cylinder is at least partially immersed in the cooling liquid contained in the cooling tank.

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

According to one embodiment of the present invention, the cooling device has two pressure rollers immersed in a cooling liquid contained in a cooling tank. Advantageously, the two pressure rollers are rotationally driven to apply a tensile force to the extruded film.

According to one embodiment of the present invention, the stretching system has two stretching devices disposed on either side of the extruded film, each stretching device having:
A guide rail and
a plurality of clamps for gripping the same longitudinal edge of the film, the clamps being arranged along and configured to be guided by each of the guide rails;
an endless chain coupled to each clamp and configured to drive each clamp along a respective guide rail;
has.

According to one embodiment of the present invention, each endless chain is deformable between a first state in which the clamps are positioned close to each other and a second state in which the clamps are moved away from each other.

According to one embodiment of the present invention, the guide rails of the two drawing devices extend at least partially into the furnace chamber.

According to one embodiment of the present invention, the guide rails of the two stretching devices are spaced apart from each other in the stretching region.

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

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

According to one embodiment of the present invention, the stretching system is configured such that each endless chain is deformed between a first state and a second state within the stretching zone. This configuration ensures that the film is stretched transversely and simultaneously stretched or relaxed longitudinally.

According to one embodiment of the present invention, the stretching system is configured such that each endless chain is deformed between a first state and a second state in the drying area. This configuration ensures that the transverse stretching of the film is followed by longitudinal stretching or longitudinal relaxation of the film.

FIG. 1 is a schematic view of a biaxially stretched microporous film manufacturing facility according to a first embodiment of the present invention. FIG. 2 is a partial view of the stretching area of the stretching system of the manufacturing facility of FIG. FIG. 3 is a partial view of the preheating area of the drawing system of the manufacturing facility of FIG. FIG. 4 is a partial view of the drying area of the stretching system of the manufacturing facility of FIG. FIG. 5 is a partial perspective view of a stretching device belonging to a stretching system, showing the endless chain in a first state. FIG. 6 is a partial perspective view of the stretching device of FIG. 5, showing the endless chain in a second position. FIG. 7 is a schematic view of an apparatus for producing a biaxially stretched microporous film according to a second embodiment of the present invention.

The invention will be better understood from the following description, with reference to the accompanying schematic diagrams showing two non-limiting embodiments of this manufacturing facility.

Figure 1 shows a manufacturing facility 2 for producing a biaxially oriented microporous film 3, such as a biaxially oriented microporous film 3 for producing a battery separator film, having two substantially parallel longitudinal edges 4.

This manufacturing equipment 2 continuously
an extruder 5, such as a co-rotating twin screw extruder, configured to melt extrude a composition comprising one or more polymers, such as polyethylene and/or polypropylene, and an oil, such as paraffin oil, to form an extruded film, for example consisting of a mixture of 20% to 30% polymer and 70% to 80% oil;
a cooling device 6 configured to cool the extruded film;
an oil extractor 7 configured to extract oil from the extruded film so as to form micropores in the extruded film;
a stretching system 8 disposed downstream of the oil extractor 7 and configured to stretch the extruded film in the machine direction and the transverse direction;
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;
has.

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

The cooling device 6 may further include one or more deflection rollers 6.3 immersed in the cooling liquid and two pressure rollers 6.4 immersed in the cooling liquid and driven to rotate so as to apply a tensile force to the extruded film.

The oil extraction device 7 more particularly comprises an extraction tank 7.1 containing an extraction liquid, e.g. a solvent, e.g. an organic solvent, in which the film is immersed during its passage through the oil extraction device 7. Advantageously, the oil extraction device 7 comprises a number of deflection rollers 7.2 immersed in the extraction liquid and configured to increase the passage time of the extruded film through the oil extraction device 7.

The stretching system 8 has a furnace 9 configured to heat the extruded film, and the furnace 9 has a furnace chamber 11 configured within which the extruded film moves in the moving direction D.

The furnace chamber 11 has a film inlet 11.1 located at a first end of the furnace chamber 11 and a film outlet 11.2 located at a second end of the furnace chamber 11. The furnace chamber 11 further has a preheating zone 12 in which the extruded film can be heated to a predetermined stretching temperature, a stretching zone 13 in which the extruded film is stretched, and a drying zone 14 in which the stretched film is stabilized and dried and can be selectively retracted. The preheating zone 12, the stretching zone 13 and the drying zone 14 are advantageously arranged in sequence in the direction of travel D.

The furnace 9 further comprises a steam injection device 15 configured to inject steam, in particular water vapor, into the stretching zone 13 and towards the extruded film to remove oil from the extruded film. The steam injection device 15 advantageously comprises a first set of upper steam injection nozzles 16 positioned above the extruded film and oriented to face the upper surface of the extruded film, and a second set of lower steam injection nozzles 17 positioned below the extruded film and oriented to face the lower surface of the extruded film. The upper and lower steam injection nozzles 16 and 17 each comprise one or more exit orifices for allowing the steam to pass into the stretching zone.

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 opposite the lower steam injection nozzle 17.

The heating furnace 8 further includes a steam generation circuit configured to generate steam and supply the steam to the steam injection device 15.

The steam generation circuit includes 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 includes, for example, a first steam distribution passage 19.1 that fluidly connects the steam generation chamber 18 to the upper steam injection nozzle 16 and a second steam distribution passage 19.2 that fluidly connects the steam generation chamber 18 to the lower steam injection nozzle 17.

The steam generation circuit also 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, for example, by a heat exchanger.

According to the illustrated embodiment, the steam generation circuit further comprises 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 advantageously has an injection opening 22.1 opening into the steam generation chamber 18 in the vicinity of the heating device 21.

2, the steam generation circuit further includes an air supply passage 23 opening into the steam generation chamber 18 and configured to supply air to the steam generation chamber 18. The heating device 22 is advantageously 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 ejection device 22.

The steam generation circuit also has a fan 24 configured to send steam generated in the steam generation chamber 18 to the steam injection device 15.

According to the illustrated embodiment, the steam generation circuit further comprises a suction device 25 fluidly connected to the stretching area 13 and configured to suck air entrained together with the steam into the oil present in the stretching area 13. Advantageously, the suction device 25 comprises a suction orifice 26 opening into the stretching area 13 and connected to the steam generation chamber 18 via the air supply channel 23. As a result, the air sucked in by the suction device 25 is re-injected into the stretching area 13 via the steam injection device 15.

Advantageously, the steam generation circuit has an oil filter 27 configured to filter the air sucked in by the suction device 25. The oil filter 27 is arranged upstream of the steam generation chamber 18 and can be arranged, for example, in the air supply path 23.

As shown in Figures 3 and 4, the heating furnace 8 further includes a first hot air injection device 28 arranged upstream of the steam injection device 15 and configured to blow hot air toward the extruded film into the preheating area 12 to heat the extruded film while it is moving through the preheating area 12, and a second hot air injection device 29 arranged downstream of the steam injection device 15 and configured to blow hot air toward the extruded film into the drying area 14 to dry the extruded film while it is moving through the drying area 14.

The first and second hot air ejection devices 28, 29 each have an upper hot air ejection nozzle 31, 32 arranged above the extruded film and configured to face the upper surface of the extruded film, and a series of lower hot air ejection nozzles 33, 34 arranged below the extruded film and configured to face the lower surface of the extruded film.

Advantageously, the heating furnace 8 includes a first hot air generating circuit 35 configured to generate hot air and supply the hot air to the first hot air ejection device 28, and a second hot air generating circuit 36 configured to generate hot air and supply the hot air to the second hot air ejection device 29.

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 ejection 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 ejection nozzle 31 of the first hot air ejection device 28, and a second hot air distribution path 38.2 that fluidly connects the first heating chamber 37 to the lower hot air ejection nozzle 32 of the first hot air ejection device 28.

The first hot air generating circuit 35 further includes a first heating element 39 arranged in 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.

The first hot air generating circuit 35 also has 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 the heated air in the first heating chamber 37 toward the first hot air ejection device 28.

According to the embodiment shown in the figures, the first hot air generating circuit 35 further comprises a first air suction device 43 fluidly connected to the preheating area 12 and configured to suck air present in the preheating area 12. Advantageously, the first air suction device 43 comprises a first air suction orifice 44 opening into the preheating area 12 and connected to the first heating chamber 37 via the first air supply passage 41. Thus, the air sucked in by the first air suction device 43 is re-injected into the preheating area 12 via the first hot air injection device 28.

Similarly, the second hot air generation circuit 36 includes a second heating chamber 45, a second heating element 46 disposed within the second heating chamber 45 and configured to heat the internal volume of the second heating chamber 45, a second hot air distribution circuit 47 fluidly connecting the second heating chamber 45 to the second hot air ejection device 29, a second air supply passage 48 opening into the second heating chamber 45 and configured to supply air to the second heating chamber 45, and a second fan 49 configured to send the heated air in the second heating chamber 45 to the second hot air ejection device 29.

The second hot air generating circuit 36 further comprises a second air suction device 51 fluidly connected to the drying area 14 and configured to suck air present in the drying area 14. Advantageously, the second air suction device 51 comprises a second air suction orifice 52 opening into the drying area 12 and 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 area 14 via the second hot air injection device 29.

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

The stretching system 8 further includes two stretching devices 53 arranged on either side of the extruded film 3.

As shown in detail in FIGS. 5 and 6, each stretching device 53 has:
a guide rail 54 extending at least partially within the furnace chamber 11 and having a first guide surface pivoted toward the film 3 and a second guide surface opposite the first guide surface;
a plurality of clamps 55 for gripping corresponding longitudinal edges 4 of the film 3, each clamp 55 being adapted to be guided in a translational direction by a guide rail 54;
a support rail 56 extending along each of the guide rails 54 and having a support surface turned toward each of the guide rails 54 and a support surface opposite the support surface;
a plurality of guide elements 57 arranged along the holding rail 56 and configured to be guided in a translational direction by the holding rail 56;
an endless chain 58 configured to drive each clamp 55 along its respective guide rail 54 and each guide element 57 along its respective retaining rail 56, the endless chain 58 being deformable between a first state (see FIG. 5 ) in which the clamps 55 are positioned adjacent to one another, and a second state (see FIG. 6 ) in which the clamps 55 have been moved away from one another;
has.

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 zone 12, move away from each other in the stretching zone 13, and extend substantially parallel to each other in the drying zone 14. This configuration of the guide rails 54 ensures that the extruded film can be stretched in the transverse direction, particularly in the stretching zone 13.

Advantageously, the stretching system 8 is configured such that each endless chain 58 is transformed from a first state to a second state within the stretching zone 13. This configuration ensures that the film is stretched longitudinally and transversely simultaneously. Such transformation of each endless chain 58 can be achieved by reducing the distance between the guide rail 54 and the holding rail 56 of each stretching device 53.

The stretching system 8 is also configured such that each endless chain 58 is deformed from the second state to the first state in the drying area 14. This configuration ensures longitudinal relaxation of the film during final drying, i.e. after 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.

Therefore, the manufacturing equipment 2 according to the first embodiment of the present invention preheats the extruded film while it passes through the preheating zone 12 by injecting hot air onto the extruded film via the first hot air injection device 28, stretches the extruded film in the longitudinal and transverse directions while it passes through the stretching zone 13, removes oil contained in the extruded film while it passes through the stretching zone 13 by injecting steam onto the extruded film via the steam injection device 15, dries and stabilizes the extruded film while it passes through the drying zone 14 by injecting hot air onto the extruded film via the second hot air injection device 29, and finally relaxes the film in the longitudinal direction while it passes through the stretching zone 13.

Figure 7 shows a production installation 2 according to a second embodiment of the present invention, which differs essentially from the first embodiment shown in Figures 1 to 6 in that the stretching system 8 is configured only to stretch the film in the transverse direction, and further has a stretching device 59 arranged upstream of the oil extraction device 7 and configured to stretch the extruded film in the longitudinal direction. The stretching device 59 may, for example, have several stretching cylinders with different rotation speeds.

According to an embodiment of the present invention not shown, the production 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 degreaser in the stretching region 13 toward the extruded film to remove oil contained in the extruded film.

Needless to say, the invention is not limited to the single embodiment of the manufacturing equipment described as an example, but on the contrary includes all its variants.

Claims (12)

A production facility (2) for producing a microporous film,
an extruder (5) configured to melt extrude a composition comprising at least one polymer and an 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 an oven (9) configured to heat the extruded film and having an oven chamber (11) configured for movement of the extruded film in a direction of movement,
The furnace (9) further comprises a steam injection device (15) configured to inject steam into the furnace chamber (11) and toward the extruded film to remove oil from the extruded film;
an oil extractor (7) configured to extract oil from the extruded film and form micropores in the extruded film, and a stretching system (8) is disposed downstream of the oil extractor (7);
1. A production installation (2) characterized in that the oil extraction device (7) has an extraction tank (7.1) containing an extraction liquid, and is configured so that the extruded film is immersed in the extraction liquid while passing through the oil extraction device (7). In the manufacturing equipment (2) according to claim 1,
A manufacturing installation (2) in which a steam injection device (15) has a plurality of steam injection nozzles (16, 17) arranged along a direction of movement (D). In the manufacturing equipment (2) of claim 2,
A manufacturing facility (2) having a plurality of steam injection nozzles, including a first set of upper steam injection nozzles (16) positioned above the extruded film and oriented to face an upper surface of the extruded film, and a second set of lower steam injection nozzles (17) positioned below the extruded film and oriented to face a lower surface of the extruded film. The production facility (2) according to any one of claims 1 to 3,
A manufacturing facility (2) in which a furnace chamber (11) has a stretching zone (13), a preheating zone (12) located upstream of the stretching zone (13), and a drying zone (14) located downstream of the stretching zone (13). In the manufacturing equipment (2) according to claim 4,
The manufacturing facility (2), wherein a steam injection device (15) is configured to inject steam into the drawing zone (13). The production installation (2) according to any one of claims 1 to 5,
A manufacturing facility (2) in which a furnace (9) has a suction device (25) fluidly connected to the furnace chamber (11) and configured to suction air containing steam and oil present in the furnace chamber (11). The manufacturing equipment (2) according to claim 6,
The manufacturing facility (2) has a suction device (25) fluidly connected to a steam injection device (15) such that air sucked by the suction device (25) is at least partially re-injected into the furnace chamber (11) via the steam injection device (15). The production installation (2) according to any one of claims 1 to 7,
A manufacturing facility (2) in which a heating furnace (9) is provided, the facility (2) having a first hot air injection device (28) arranged upstream of the steam injection device (15) and configured to inject hot air into the heating furnace chamber (11) toward the extruded film to heat the extruded film, and a second hot air injection device (29) arranged downstream of the steam injection device (15) and configured to inject hot air into the heating furnace chamber (11) toward the extruded film to dry the extruded film. The production installation (2) according to any one of claims 1 to 8 ,
A production installation (2) in which the oil extraction device (7) comprises a number of deflection rollers (7.2) at least partially immersed in the extraction liquid. The production installation (2) according to any one of claims 1 to 9 ,
The production facility (2) further comprises a stretching device (59) configured to stretch the extruded film in the machine direction, the stretching device (59) being disposed upstream of the oil extraction device (7). The production installation (2) according to any one of claims 1 to 9 ,
The manufacturing facility (2) wherein a stretching system (8) is configured to stretch the extruded film in the machine and transverse directions. The manufacturing facility (2) according to claim 11 ,
The manufacturing facility (2), wherein a stretching system (8) is configured to simultaneously stretch an extruded film in the machine and transverse directions.