Manufacturing and using method of multi-layer co-extruded film

Abstract

The invention provides a manufacturing and using method of a multi-layer co-extrusion film, and belongs to the technical field of plastic film manufacturing, the multi-layer co-extrusion film comprises a bottom plate, the upper surface of the bottom plate is fixedly connected with a three-layer tower-type frame, the bottom plate and the three-layer tower-type frame are provided with a film drawing mechanism, the two sides of the three-layer tower-type frame are connected with adjusting mechanisms, and the adjusting mechanisms are arranged on the bottom plate. The inner wall of the adjusting mechanism is connected with a mold guiding mechanism, the extruders and the blowing machine are arranged below the three-layer tower type frame, and the multiple extruders communicate with the blowing machine. Lifting of a fixed plate is achieved through an electric telescopic rod, contact between a contact wheel and the surface of a film bubble is matched, if the air outlet amount is large, the force borne by expansion of the film bubble is large, the contraction degree of a movable rod is large, and otherwise, the contraction degree of the movable rod is small, so that the sliding process of the movable rod is completed; at the moment, the moving degree of the moving rod and the stress degree of the film bubbles can be obtained through the first pressure sensor and the second pressure sensor, and therefore the air outlet amount can be conveniently controlled.

Description

Technical Field

[0001] The invention relates to the technical field of plastic film manufacturing, and in particular to a method for manufacturing and using a multi-layer co-extruded film. Background Art

[0002] Multilayer co-extruded film is a special plastic film, which is made of multiple layers of plastic materials. This film usually has excellent weather resistance, temperature resistance, chemical corrosion resistance and other properties, and can be used in various occasions, such as food packaging, pharmaceutical packaging, cosmetic packaging, industrial material packaging, etc.

[0003] The multi-layer co-extruded film of the prior art has the problem of separation between the layers of the film during the manufacturing process. In the production process of the multi-layer film, a film blowing machine is used to blow the film, which needs to go through an extrusion composite process. When the diameter of the film bubble needs to be changed, the wind force of the blowing machine needs to be controlled to thereby change the diameter of the film bubble. If the wind force is too strong, it will affect the rupture of the film, and if the wind force is too weak, it will make the film bubble difficult to bond.

[0004] Therefore, the present application provides a method for manufacturing and using a multi-layer co-extruded film to meet the needs. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method for manufacturing and using a multi-layer co-extruded film to solve the problem of separation between film layers in the existing multi-layer co-extruded film.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A method for manufacturing and using a multi-layer co-extruded film, comprising a bottom plate, a three-layer tower frame, a blowing machine, an extruder, a film-pulling mechanism, an adjusting mechanism and a mold-leading mechanism, wherein the upper surface of the bottom plate is fixedly connected with the three-layer tower frame, the bottom plate and the upper inner side of the three-layer tower frame are provided with a film-pulling mechanism, the upper two side walls of the three-layer tower frame are connected with the adjusting mechanism, the inner wall of the adjusting mechanism is connected with the mold-leading mechanism, the extruder and the blowing machine are both arranged below the three-layer tower frame, and a plurality of the extruders are connected with the blowing machine;

[0008] The mold-leading mechanism includes a fixed frame, a support plate, an electric telescopic rod, a fixed plate, a mobile rod, a contact wheel, a spring, a fixed tube, a first pressure sensor and a second pressure sensor. The bottom inner cavity of the fixed frame is fixedly connected to the support plate, a plurality of electric telescopic rods are connected to the support plate, the top of the electric telescopic rod is fixedly connected to the fixed plate, a fixed tube is arranged in the fixed plate, a mobile rod is movably arranged inside the fixed tube, the contact wheel is movably arranged at one end of the mobile rod away from the fixed tube through a rotating shaft, the first pressure sensor is fixedly arranged on one side of the inside of the fixed tube; the second pressure sensor is fixedly arranged on one side of the inside of the fixed tube away from the first pressure sensor; the spring is arranged inside the fixed tube and between the mobile rod and the first pressure sensor.

[0009] As a preferred solution, the adjusting mechanism includes a first motor, a driving screw, a bearing ring, a rectangular plate, a sliding rod and a clamping block. The first motor is arranged on both sides of the three-layer tower frame, and the output shaft of the first motor is connected to the driving screw. The bottom of the driving screw is rotatably connected to the bearing ring, the outer side of the driving screw is movably connected to the sliding rod, the top of the sliding rod is fixedly connected to the clamping block, the clamping block is movably contacted with the outer side wall of the fixed frame, the two side walls of the three-layer tower frame are fixedly connected to the rectangular plate, and the bearing ring is arranged at the bottom of the inner cavity of the rectangular plate.

[0010] As a preferred solution, the mold-drawing mechanism includes a second motor, a fixed block, a first gear, a second gear, an active traction roller and a driven traction roller. Fixed blocks are arranged on both sides of the top of the three-layer tower frame, a second motor is arranged on one side of the fixed block, an output shaft sleeve of the second motor is connected with a first gear, a second gear is arranged on one side of the first gear, the first gear is meshed with the second gear, an output end of the first gear is connected with an active traction roller, an output end of the second gear is connected with a driven traction roller, and the active traction roller and the driven traction roller are arranged between the two fixed blocks.

[0011] As a preferred solution, the active traction roller and the driven traction roller are configured in the same manner, and a herringbone frame is commonly provided below the active traction roller and the driven traction roller.

[0012] As a preferred solution, the first pressure sensor is electrically connected to the second pressure sensor and the blowing machine.

[0013] As a preferred solution, three extruders are arranged, and all three extruders are connected to the blowing machine.

[0014] As a preferred solution, a slide groove is provided on the top of the three-layer tower frame, and the slide groove is provided between the active traction roller and the driven traction roller.

[0015] As a preferred solution, it comprises a manufacturing device for a multi-layer co-extruded film as described in any one of claims 1-7.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] 1. In the above scheme, the top fixed plate can be raised and lowered by setting a plurality of electric telescopic rods. The plurality of electric telescopic rods are moved upward and inward, which can enable the contact wheel on the top to contact the surface of the membrane bubble. If the air output is large and the membrane bubble is expanded with a large force, the moving rod will shrink to a greater extent. Otherwise, the moving rod will shrink to a lesser extent, thereby completing the sliding process of the moving rod. At this time, the degree of movement of the moving rod and the degree of force on the membrane bubble can be obtained by the first pressure sensor and the second pressure sensor, thereby facilitating the control of the air output.

[0018] 2. In the above scheme, driven by the second motor electric spindle, the first gear can drive the second gear to achieve meshing rotation, thereby rotating the active traction roller and the driven traction roller. At the same time, driven by the active traction roller and the driven traction roller, the herringbone frame below can extrude the film, greatly improving the adhesion of the film.

[0019] 3. In the above scheme, the fixed frame can be adjusted up and down through the adjustable mechanism, so as to cooperate with the blowing machine and extruder at the bottom to complete the overall film blowing process. At the same time, it can cooperate with the mold-leading mechanism to coordinate the force on the film bubble. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, further serve to explain the principles of the present disclosure and to enable those skilled in the relevant art to make and use the present disclosure.

[0021] Figure 1 A three-dimensional structural schematic diagram of a method for manufacturing and using a multi-layer co-extruded film;

[0022] Figure 2 A schematic diagram of the internal structure of a fixed frame for a method of manufacturing and using a multi-layer co-extruded film;

[0023] Figure 3 A diagram of a mobile rod structure for manufacturing and using a multi-layer co-extruded film;

[0024] Figure 4 A structural analysis diagram of a mold-leading mechanism for a method for manufacturing and using a multi-layer co-extruded film;

[0025] Figure 5 A schematic diagram of the structure of an adjustment mechanism for a method for manufacturing and using a multi-layer co-extruded film;

[0026] Figure 6 A structural diagram of a film-drawing mechanism for a method for manufacturing and using a multi-layer co-extruded film;

[0027] Figure 7 The present invention is a structural diagram of the first gear and the second gear of a method for manufacturing and using a multi-layer co-extruded film.

[0028] [reference numerals]

[0029] 1. Bottom plate; 2. Extruder; 3. Mold-drawing mechanism; 301. Fixed frame; 302. Support plate; 303. Electric telescopic rod; 304. Fixed plate; 305. Second pressure sensor; 306. Spring; 307. First pressure sensor; 308. Moving rod; 309. Contact wheel; 310. Fixed tube; 4. Adjusting mechanism; 401. First motor; 402. Driving screw; 403. Rectangular plate; 404. Bearing ring; 405. Sliding rod; 406. Clamping block; 5. Film-pulling mechanism; 501. Fixed block; 502. Active traction roller; 503. Driven traction roller; 504. Herringbone frame; 505. Second motor; 506. First gear; 507. Second gear; 6. Three-layer tower frame; 7. Blowing machine.

[0030] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments, and the adjustments or modifications made are still included in the scope of the attached claims. DETAILED DESCRIPTION

[0031] The following is a detailed description of the manufacturing and use methods of a multi-layer co-extruded film provided by the present invention in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternatives to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0032] It should be noted that the references to "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0033] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0034] It will be understood that the meaning of “on,” “over,” and “above” in this disclosure should be interpreted in the broadest manner, so that “on” means not only “directly on” something, but also includes the meaning of being “on” something with intervening features or layers therebetween, and “on” or “over” means not only “on” or “above” something, but also includes the meaning of being “on” or “above” something with no intervening features or layers therebetween.

[0035] Additionally, spatially relative terms such as "under," "beneath," "lower," "above," "upper," and the like may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as shown in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein may be similarly interpreted accordingly.

[0036] Example

[0037] like Figure 1 and Figure 5 As shown, an embodiment of the present invention provides a method for manufacturing and using a multi-layer co-extruded film, comprising a bottom plate 1, a three-layer tower frame 6, a blowing machine 7, an extruder 2, a film-drawing mechanism 3, an adjusting mechanism 4 and a mold-leading mechanism 5, wherein the top surface of the bottom plate 1 is fixedly connected with the three-layer tower frame 6, the film-drawing mechanism 3 is arranged on the top side of the bottom plate 1 and the inside of the three-layer tower frame 6, the adjusting mechanism 4 is connected to the two side walls on the three-layer tower frame 6, the inner wall of the adjusting mechanism 4 is connected to the mold-leading mechanism 5, the extruder 2 and the blowing machine 7 are both arranged below the three-layer tower frame 6, and a plurality of extruders 2 are connected to the blowing machine 7;

[0038] The mold-leading mechanism 3 includes a fixed frame 301, a support plate 302, an electric telescopic rod 303, a fixed plate 304, a moving rod 308, a contact wheel 309, a spring 306, a fixed tube 310, a first pressure sensor 307 and a second pressure sensor 305. The inner cavity at the bottom of the fixed frame 301 is fixedly connected to the support plate 302, a plurality of electric telescopic rods 303 are connected to the support plate 302, the top of the electric telescopic rod 303 is fixedly connected to the fixed plate 304, a fixed tube 310 is arranged in the fixed plate 304, the moving rod 308 is movably arranged in the fixed tube 310, the contact wheel 309 is movably arranged at one end of the moving rod 308 away from the fixed tube 310 through a rotating shaft, the first pressure sensor 307 is fixedly arranged on one side of the fixed tube 310; the second pressure sensor 305 is fixedly arranged on one side of the fixed tube 310 away from the first pressure sensor 307; the spring 306 is arranged in the fixed tube 3 10 inside and between the moving rod 308 and the first pressure sensor 307, the adjustment mechanism 4 includes a first motor 401, a driving screw 402, a bearing ring 404, a rectangular plate 403, a sliding rod 405 and a clamping block 406, the first motor 401 is arranged on both sides of the three-layer tower frame 6, the output shaft of the first motor 401 is connected with the driving screw 402, the bottom of the driving screw 402 is rotatably connected with the bearing ring 404, the outer side of the driving screw 402 is movably connected with the sliding rod 405, the top of the sliding rod 405 is fixedly connected with the clamping block 406, the clamping block 406 is movably contacted with the outer wall of the fixed frame 301, the two side walls of the three-layer tower frame 6 are fixedly connected with the rectangular plate 403, and the bearing ring 404 is arranged at the bottom of the inner cavity of the rectangular plate 403, the first pressure sensor 307 is electrically connected with the second pressure sensor 305 and the blowing machine 7, three extruders 2 are arranged, and the three extruders 2 are all connected to the blowing machine 7.

[0039] What needs to be further explained is that: after the raw materials are injected and placed through the extruder 2, they are transported inwards through the blowing machine 7, so that the blowing machine 7 can realize the blowing process upwards, and the mold-leading mechanism 3 arranged above can make the top fixed plate 304 move upwards through the electric telescopic rod 303, and the internally arranged support plate 302 can realize the supporting effect on the electric telescopic rod 303, and the fixed tube 310 embedded in the fixed plate 304 can accommodate the first pressure sensor 307 and the second pressure sensor 305. When the surface of the film bubble contacts the contact wheel 309 The moving rod 308 on one side of the contact wheel 309 can be moved horizontally by the size of the air outlet. The first pressure sensor 307 and the second pressure sensor 305 arranged on both sides of the moving rod 308 can detect the pressure and then adjust the air outlet according to the detection value. The setting adjustment mechanism 4 can make the driving screw 402 at the output end rotate under the drive of the first motor 401 electric spindle, and the sliding rod 405 outside the driving screw 402 can slide in the vertical height, and then the clamping block 406 is used to realize clamping and lifting.

[0040] like Figure 6 , Figure 7 As shown, the film pulling mechanism 5 includes a second motor 505, a fixed block 501, a first gear 506, a second gear 507, an active traction roller 502 and a driven traction roller 503. Fixed blocks 501 are arranged on both sides of the top of the three-layer tower frame 6. A second motor 505 is arranged on one side of the fixed block 501. The output shaft sleeve of the second motor 505 is connected with a first gear 506. A second gear 507 is arranged on one side of the first gear 506. The first gear 506 is meshed with the second gear 507. The output end of the gear 506 is connected to the active traction roller 502, and the output end of the second gear 507 is connected to the driven traction roller 503. The active traction roller 502 and the driven traction roller 503 are arranged between two fixed blocks 501. The active traction roller 502 and the driven traction roller 503 are arranged in the same manner. A herringbone frame 504 is arranged below the active traction roller 502 and the driven traction roller 503. A slide groove is opened on the top of the three-layer tower frame 6, and the slide groove is opened between the active traction roller 502 and the driven traction roller 503.

[0041] What needs to be further explained is that: driven by the second motor 505 electric spindle, the first gear 506 at the output end can drive the second gear 507 on one side to rotate in relative meshing. At this time, the first gear 506 is connected to the input end of the active traction roller 502, and the second gear 507 is connected to the driven traction roller 503 through the transmission shaft. At the same time, the active traction roller 502 and the driven traction roller 503 can drive the bottom herringbone frame 504 to shrink inward or outward, so that the film bubble can be compressed and compacted during extrusion, thereby greatly improving the adhesion of the film layer.

[0042] The technical solution provided by the present invention is that when it is necessary to complete the manufacturing process of the co-extruded film, the three extruders 2 arranged on the bottom plate 1 use the placement slots to complete the inward feeding of the raw materials, and the blowing machine 7 is further used to blow the raw materials, and the film bubble is guided upward by the mold-leading mechanism 3, and the adjustment mechanism 4 on both sides of the mold-leading mechanism 3 is used to realize its lifting and lowering adjustment, and then the film is completed through the film-pulling mechanism 5 above. The co-extrusion process.

[0043] Next, when the film bubble needs to be pulled, the electric telescopic rod 303 provided on the fixed frame 301 is used to achieve lifting and lowering. The multiple electric telescopic rods 303 inward can drive the fixed plate 304 fixedly installed on the top to move. The fixed plate 304 is provided with a spring 306, a first pressure sensor 307, a second pressure sensor 305, a moving rod 308 and a contact wheel 309. The contact wheel 309 contacts the outer surface of the film bubble. Combined with the air volume, if the air volume is too large, the moving rod 308 is moved. 8 will be subjected to the outward expansion force to realize the contraction of the inside of the fixed tube 310, and similarly, the moving rod 308 will be expanded outward, and then the force received is detected by the first pressure sensor 307 and the second pressure sensor 305, and the first pressure sensor 307 and the second pressure sensor 305 are electrically connected to the pump body inside the blowing machine 7, and then the pump body can be guided to control the air volume by using the value transmission, and the thickness of the film blown out of the film bubble and the subsequent adhesion of the interlayer film can be achieved in a uniform bonding state;

[0044] Next, by starting the first motor 401, the driving screw 402 at the output end can be driven to rotate the driving screw 402, and the bearing ring 404 arranged at the bottom can realize the rotation process relative to the driving screw 402. The sliding rod 405 sleeved on the outer wall of the driving screw 402 can complete the sliding process on the driving screw 402, and then clamp and fix the clamping block 406 connected on one side. The integrated position of the fixed frame 301 can be moved and positioned in coordination with the lifting, and its distance from the blowing machine 7 at the bottom can be effectively adjusted.

[0045] Subsequently, the film bubble is able to realize its upward extrusion process under the rotation traction of the top and the active traction roller 502 and the driven traction roller 503. Driven by the second motor 505 electric spindle, it can drive the first gear 506 on the output shaft to rotate, and at the same time drive the second gear 507 on one side to rotate relatively. At this time, the output ends of the first gear 506 and the second gear 507 are connected to the active traction roller 502 and the driven traction roller 503, and the relative motion state can be realized by cooperating with the provided slide groove.

[0046] Finally, the herringbone frame 504 connected at the bottom of the active traction roller 502 and the driven traction roller 503 can achieve uniform extrusion of the film during the upward contraction process, and can effectively regulate the gaps in the film. Finally, after the extrusion is completed, the film is removed and rolled up using the winding roller to complete the operation.

[0047] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0048] A person skilled in the art will appreciate that all or part of the steps in the above-mentioned embodiment method can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc.

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A device for manufacturing a multi-layer co-extruded film, characterized in that: The invention comprises a bottom plate (1), a three-layer tower frame (6), a blowing machine (7), an extruder (2), a film-pulling mechanism (5), an adjusting mechanism (4) and a mold-leading mechanism (3); the upper surface of the bottom plate (1) is fixedly connected to the three-layer tower frame (6); the film-pulling mechanism (5) is arranged on the upper side of the bottom plate (1) and the inner side of the three-layer tower frame (6); the upper two side walls of the three-layer tower frame (6) are connected to the adjusting mechanism (4); the inner wall of the adjusting mechanism (4) is connected to the mold-leading mechanism (3); the extruder (2) and the blowing machine (7) are both arranged below the three-layer tower frame (6); and a plurality of the extruders (2) are connected to the blowing machine (7); The mold-leading mechanism (3) comprises a fixed frame (301), a support plate (302), an electric telescopic rod (303), a fixed plate (304), a moving rod (308), a contact wheel (309), a spring (306), a fixed tube (310), a first pressure sensor (307) and a second pressure sensor (305); the inner cavity at the bottom of the fixed frame (301) is fixedly connected to the support plate (302); the support plate (302) is connected to a plurality of electric telescopic rods (303); the top of the electric telescopic rod (303) is fixedly connected to the fixed plate (304); a fixed tube (310) is arranged inside the fixed plate (304); 310), a moving rod (308) is movably arranged inside the fixed tube (310), the contact wheel (309) is movably arranged at one end of the moving rod (308) away from the fixed tube (310) through a rotating shaft, the first pressure sensor (307) is fixedly arranged on one side inside the fixed tube (310); the second pressure sensor (305) is fixedly arranged on one side inside the fixed tube (310) away from the first pressure sensor (307); the spring (306) is arranged inside the fixed tube (310) and between the moving rod (308) and the first pressure sensor (307).

2. A manufacturing device for a multi-layer co-extruded film according to claim 1, characterized in that: The adjusting mechanism (4) comprises a first motor (401), a driving screw (402), a bearing ring (404), a rectangular plate (403), a sliding rod (405) and a clamping block (406). The first motor (401) is arranged on both sides of the three-layer tower frame (6). The output shaft of the first motor (401) is connected to the driving screw (402). The bottom of the driving screw (402) is rotatably connected to the bearing ring (404). The outer side of the driving screw (402) is movably connected to the sliding rod (405). The top of the sliding rod (405) is fixedly connected to the clamping block (406). The clamping block (406) is movably in contact with the outer side wall of the fixed frame (301). The two side walls of the three-layer tower frame (6) are fixedly connected to the rectangular plate (403), and the bearing ring (404) is arranged at the bottom of the inner cavity of the rectangular plate (403).

3. A manufacturing device for a multi-layer co-extruded film according to claim 2, characterized in that: The film-drawing mechanism (5) comprises a second motor (505), a fixed block (501), a first gear (506), a second gear (507), an active traction roller (502) and a driven traction roller (503). The top two sides of the three-layer tower frame (6) are provided with fixed blocks (501). One side of the fixed block (501) is provided with a second motor (505). The output shaft sleeve of the second motor (505) is connected with a first gear (506). One side of the first gear (506) is provided with a second gear (507). The first gear (506) is meshedly connected with the second gear (507). The output end of the first gear (506) is connected with the active traction roller (502). The output end of the second gear (507) is connected with the driven traction roller (503). The active traction roller (502) and the driven traction roller (503) are arranged between the two fixed blocks (501).

4. A manufacturing device for a multi-layer co-extruded film according to claim 3, characterized in that: The active traction roller (502) and the driven traction roller (503) are configured in the same manner, and a herringbone frame (504) is commonly disposed below the active traction roller (502) and the driven traction roller (503).

5. The manufacturing device of a multi-layer co-extruded film according to claim 1, characterized in that: The first pressure sensor (307) is electrically connected to the second pressure sensor (305) and the blowing machine (7).

6. The manufacturing device of a multi-layer co-extruded film according to claim 1, characterized in that: The extruders (2) are arranged in three pieces, and the three extruders (2) are all connected to the blowing machine (7).

7. A manufacturing device for a multi-layer co-extruded film according to claims 1 and 3, characterized in that: A slide groove is provided on the top of the three-layer tower frame (6), and the slide groove is provided between the active traction roller (502) and the driven traction roller (503).

8. A method for producing a multi-layer co-extruded film, characterized in that: A device for manufacturing a multi-layer co-extruded film comprising any one of claims 1-7.

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