Co-extrusion preparation device for multi-layer film

Abstract

The utility model discloses a multi-layer film co-extrusion preparation device, which relates to the technical field of multi-layer film production, and comprises a rack, a secondary heating device, a winding device and a plurality of extruders arranged in parallel, two matched extrusion composite rollers are arranged below a plurality of extrusion ports, a first cooling roller assembly is arranged below the extrusion composite rollers, and a second cooling roller assembly is arranged below the first cooling roller assembly. Two matched secondary pressing rollers are arranged below the secondary heating device, a second cooling roller assembly is arranged below the secondary pressing rollers, each of the first cooling roller assembly and the second cooling roller assembly comprises a mounting frame and a plurality of cooling roller units which are vertically arranged, and each cooling roller unit comprises a linear driver, a first cooling roller and a second cooling roller. The first cooling roller is transversely and slidably connected with the mounting frame, and the second cooling roller is transversely and slidably connected with the mounting frame. According to the co-extrusion preparation device, the appropriate number of cooling roller units can make contact with multiple layers of films, the film extrusion speed is guaranteed while the cooling effect is guaranteed, and the production efficiency of the device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of multi-layer film production, in particular to a co-extrusion preparation device for the multi-layer film. Background Art

[0002] In the biopharmaceutical process, disposable products are widely used; among them, bags formed by flexible films and sealed in an airtight manner are often used for material storage or bioreactors. Among them, bioreactors are devices for culturing animal, plant or microbial cells in order to achieve commercial mass production of biological products such as enzymes, antibodies or antibiotics during the production of biopharmaceuticals. Therefore, the flexible films used for disposable products in the biopharmaceutical industry need to have good strength, sterility and sealing requirements. Multilayer film is a flexible film that can better meet the above requirements. The multilayer film co-extrusion preparation device is a production equipment for producing multilayer films, which can simultaneously extrude and compound multiple single-layer films extruded by multiple extruders to form a multilayer film. For example, Chinese patent application publication number CN117067545A, with a publication date of November 17, 2023, discloses a co-extrusion preparation device and method for a multilayer composite film, comprising a plurality of extruders arranged in parallel, the extrusion port of the extruder faces downward, and two high-temperature extrusion composite rollers are arranged below the extrusion port, and two low-temperature first cooling rollers are arranged below the extrusion composite roller, and a first guide roller is arranged below the first cooling roller, and a second guide roller is arranged on the left side of the first guide roller, and a third guide roller is arranged above the second guide roller, and a fourth guide roller is arranged on the left side of the third guide roller, and a tensioning device is arranged between the third guide roller and the fourth guide roller, and a secondary heating device is arranged below the fourth guide roller, and two secondary pressing rollers are arranged below the secondary heating device, and two low-temperature second cooling rollers are arranged below the secondary pressing roller, and a fifth guide roller is arranged below the second cooling roller, and a winding device is arranged on the left side of the fifth guide roller. The multilayer film prepared in this way has good flatness on both sides, a higher degree of firmness between the layer structures, and is not easy to delaminate. However, when the co-extrusion preparation device produces multi-layer films of different thicknesses, in order to ensure the cooling effect of the multi-layer films, the corresponding film extrusion speed can only be adjusted according to the thickness of the multi-layer films. Especially when producing films with increased thickness, in order to ensure the cooling effect, the film extrusion speed can only be reduced, which affects the production efficiency of the multi-layer films to a certain extent. Utility Model Content

[0003] In order to overcome the deficiencies in the prior art, the utility model provides a co-extrusion preparation device for a multi-layer film, which can enable an appropriate number of cooling roller units to contact the multi-layer film, thereby ensuring the film extrusion speed while ensuring the cooling effect, thereby improving the production efficiency of the device.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A co-extrusion preparation device for a multi-layer film comprises a frame, a secondary heating device, a winding device and a plurality of extruders arranged in parallel installed on the frame, the extrusion port of the extruder is arranged downward, two matching extrusion composite rollers are arranged below the plurality of extrusion ports, a first cooling roller assembly is arranged below the extrusion composite roller, a plurality of first guide rollers are arranged between the first cooling roller assembly and the secondary heating device, two matching secondary pressing rollers are arranged below the secondary heating device, a second cooling roller assembly is arranged below the secondary pressing roller, a plurality of second guide rollers are arranged between the second cooling roller assembly and the winding device, the first cooling roller assembly and the second cooling roller assembly each comprise a mounting frame and a plurality of cooling roller units arranged vertically on the mounting frame, the cooling roller unit comprises a linear drive, a first cooling roller and a second cooling roller, the first cooling roller is connected to the mounting frame in a transverse sliding manner, the second cooling roller is connected to the mounting frame in a transverse sliding manner, and the linear drive is used to drive the first cooling roller and the second cooling roller to move closer to or away from each other.

[0006] The working principle of the above technical solution is: first, a plurality of raw materials are respectively put into a plurality of extruders, and a single-layer film is extruded from the base port of the extruder. These single-layer films remain in a molten state during the extrusion process. Then, these single-layer films are fed between two extrusion composite rollers, and through the joint extrusion of the two extrusion composite rollers, multiple single-layer films are composited together to form a multi-layer film. Then, the composite multi-layer film is vertically conveyed downward, passed between the first cooling roller and the second cooling roller that are squeezed against each other, and rapidly cooled for preliminary cooling and forming. The multi-layer film after preliminary cooling and forming is guided by a plurality of first guide rollers and conveyed to the secondary heating device. After heating, the surface of each layer of the multi-layer film is in a molten state again. Next, the multi-layer film after reheating is conveyed vertically downward, extruded and pressed again between two secondary pressing rollers. Then, the multi-layer film after re-pressing is vertically conveyed downward again between the first cooling roller and the second cooling roller that are squeezed against each other, and is cooled and formed again. Finally, the multi-layer film after cooling and forming is guided by a plurality of second guide rollers and transferred to the winding device to be rolled into a roll. When the thickness of the multi-layer film to be produced by the co-extrusion preparation device changes, the spacing between the first cooling roller and the second cooling roller can be adjusted by the linear drive so that any one of the cooling roller units can be in contact with or out of contact with the multi-layer film. In order to ensure the cooling effect, the thicker the multi-layer film is, the more cooling roller units can be adjusted by the linear drive to contact the multi-layer film with the spacing between the first cooling roller and the second cooling roller, so as to better cool the film, thereby ensuring the cooling effect while ensuring the film extrusion speed. This design improves the adaptability of the device and improves the production efficiency of the device. It can also reduce the temperature of multiple groups of cooling roller units from top to bottom, avoiding the impact of sudden temperature drops on the quality of the film, thereby producing higher quality films.

[0007] Preferably, the first cooling roller comprises a first cooling roller body and a first sliding frame, the first sliding frame is slidably connected to the mounting frame, and the first cooling roller body is rotatably connected to the first sliding frame; the second cooling roller comprises a second cooling roller body and a second sliding frame, the second sliding frame is slidably connected to the mounting frame, and the second cooling roller body is rotatably connected to the second sliding frame. The solution can realize the rotation of the first cooling roller body and the second cooling roller body relative to the mounting frame, and can also enable the first cooling roller body and the second cooling roller body to slide relative to the mounting frame.

[0008] Preferably, one end of the linear drive is connected to the first sliding frame, and the other end of the linear drive is connected to the second sliding frame. The solution controls the first sliding frame and the second sliding frame simultaneously through a linear drive, which is simpler to control, has better synchronization and lower cost.

[0009] Preferably, the linear drive is a cylinder, which has a certain elasticity after being extended, and the clamping force of the first cooling roller and the second cooling roller can be controlled by controlling the air pressure in the cylinder.

[0010] Preferably, the linear drive comprises a first linear drive and a second linear drive, one end of the first linear drive is connected to the first sliding frame, the other end of the first linear drive is connected to the mounting frame, one end of the second linear drive is connected to the second sliding frame, the other end of the second linear drive is connected to the mounting frame. The solution can control the movement of the first cooling roller and the second cooling roller respectively by the first linear drive and the second linear drive.

[0011] Preferably, the cooling roller unit further comprises a positioning block, which is fixed to the mounting frame, and the positioning block is arranged between the first cooling roller and the second cooling roller, a first contact block for contacting the positioning block is fixed on the first sliding frame, and a second contact block for contacting the positioning block is arranged on the second sliding frame. The positioning block can position the first cooling roller and the second cooling roller when they are close to each other, so as to avoid the contact position of the first cooling roller and the second cooling roller being too far to the left or too far to the right, and to avoid the contact position being skewed to affect the quality of the multi-layer film.

[0012] Preferably, the secondary heating device includes a first heating tube, a second heating tube at least partially sleeved on the outside of the first heating tube, and a lifting drive, wherein the first heating tube is fixed to the frame, the second heating tube is vertically slidably connected to the frame, the lifting drive is installed on the frame and is used to drive the second heating tube to rise and fall relative to the first heating tube, and heating components are provided in the first heating tube and the second heating tube.

[0013] In the above technical solution, the lifting drive can control the lifting of the second heating cylinder relative to the first heating cylinder, thereby reducing or increasing the overall height of the secondary heating device. When the film moving speed remains unchanged, the time required for the film to pass through the secondary heating device can be increased or reduced, thereby controlling the heating time of the film by the secondary heating device, thereby adapting to the secondary heating needs of films of different thicknesses.

[0014] Preferably, the secondary heating device includes a first heating tube, a second heating tube at least partially sleeved on the outside of the first heating tube, and a lifting drive, the first heating tube is vertically slidably connected to the frame, the second heating tube is fixed to the frame, the lifting drive is installed on the frame and is used to drive the first heating tube to rise and fall relative to the second heating tube, and heating components are provided in the first heating tube and the second heating tube.

[0015] In the above technical solution, the lifting drive can control the lifting of the first heating cylinder relative to the second heating cylinder, thereby reducing or increasing the overall height of the secondary heating device. When the film moving speed remains unchanged, the time required for the film to pass through the secondary heating device can be increased or reduced, thereby controlling the heating time of the film by the secondary heating device, thereby adapting to the secondary heating needs of films of different thicknesses.

[0016] Preferably, the lifting drive is an electric push rod, which can relatively accurately control the extension length, thereby relatively accurately controlling the overall height of the secondary heating device.

[0017] Preferably, the first cooling roller body is a hollow structure, and the second cooling roller body is a hollow structure. Cooling liquid can be passed into the hollow structure to cool the first cooling roller body and the second cooling roller body, thereby cooling the film through the first cooling roller body and the second cooling roller body.

[0018] Preferably, a floating roller for tensioning the film is provided between the extruder and the secondary heating device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model;

[0020] Figure 2 It is a structural schematic diagram of the cooling roller assembly in the utility model.

[0021] In the figure: extruder 2, extrusion composite roller 3, first cooling roller assembly 4, first guide roller 5, secondary heating device 6, first heating cylinder 6.1, second heating cylinder 6.2, lifting drive 6.3, secondary clamping roller 7, second cooling roller assembly 8, second guide roller 9, winding device 10, cooling roller unit 11, linear drive 11.1, first cooling roller 11.2, first cooling roller body 11.2.1, first sliding frame 11.2.2, second cooling roller 11.3, second cooling roller body 11.3.1, second sliding frame 11.3.2, positioning block 11.4, floating roller 12, mounting frame 13, rotating rod 14, cylinder 15. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] Embodiment 1:

[0024] like Figure 1 and Figure 2 As shown, a co-extrusion preparation device for a multi-layer film includes a frame, a secondary heating device 6 installed on the frame, a winding device 10 and a plurality of extruders 2 arranged in parallel, the extrusion port of the extruder 2 is arranged downward, two matching extrusion composite rollers 3 are arranged below the plurality of extrusion ports, the extrusion composite rollers 3 are rotatably connected to the frame, a first cooling roller assembly 4 is arranged below the extrusion composite roller 3, a plurality of first guide rollers 5 are arranged between the first cooling roller assembly 4 and the secondary heating device 6, the first guide roller 5 is rotatably connected to the frame, two matching secondary pressing rollers 7 are arranged below the secondary heating device 6, the secondary pressing roller 7 is rotatably connected to the frame, and a second cooling roller assembly 8 is arranged below the secondary pressing roller 7. A plurality of second guide rollers 9 are arranged between the second cooling roller assembly 8 and the winding device 10, and the second guide rollers 9 are rotatably connected to the frame. The first cooling roller assembly 4 and the second cooling roller assembly 8 each include a mounting frame 13 and a plurality of cooling roller units 11 vertically arranged on the mounting frame 13, and the mounting frame 13 is fixed to the frame. The cooling roller unit 11 includes a linear drive 11.1, a first cooling roller 11.2 and a second cooling roller 11.3. The first cooling roller 11.2 is connected to the mounting frame 13 in a transverse sliding manner, and the second cooling roller 11.3 is connected to the mounting frame 13 in a transverse sliding manner. The linear drive 11.1 is used to drive the first cooling roller 11.2 and the second cooling roller 11.3 to move closer to or away from each other.

[0025] The working principle of the above technical solution is: first, a plurality of raw materials are respectively put into a plurality of extruders 2, and a single-layer film is extruded from the base port of the extruder 2. These single-layer films remain in a molten state during the extrusion process. Then, these single-layer films are fed between two extrusion composite rollers 3, and multiple single-layer films are composited together to form a multi-layer film through the joint extrusion of the two extrusion composite rollers 3. Then, the composite multi-layer film is vertically conveyed downward, passes through the mutually extruded first cooling roller 11.2 and the second cooling roller 11.3, and is rapidly cooled for preliminary cooling and forming. The multi-layer film after preliminary cooling and forming is guided by a plurality of first guide rollers 5, conveyed to the secondary heating device 6 and passes through the secondary heating device 6. After heating, the surface of each layer of the multi-layer film is in a molten state again. Next, the multi-layer film after reheating is vertically conveyed downward, extruded and re-compressed between two secondary pressing rollers 7. Then, the multi-layer film after re-compression is vertically conveyed downward again through the mutually extruded first cooling roller 11.2 and the second cooling roller 11.3, and is re-cooled and formed. Finally, the multilayer film after cooling and forming is guided by a plurality of second guide rollers 9 and transferred to the winding device 10 to be rolled into a roll.

[0026] When the thickness of the multi-layer film to be produced by the co-extrusion preparation device changes, the linear drive 11.1 can be used to adjust the spacing between the first cooling roller 11.2 and the second cooling roller 11.3 so that any one of the cooling roller units 11 is in contact with or out of contact with the multi-layer film. In order to ensure the cooling effect, the thicker the multi-layer film is, the more cooling roller units 11 are in contact with the multi-layer film by adjusting the spacing between the first cooling roller 11.2 and the second cooling roller 11.3 through the linear drive 11.1, so that the cooling is better performed, and the film extrusion speed can be ensured while ensuring the cooling effect. This design improves the adaptability of the device and improves the production efficiency of the device. At the same time, the temperature of multiple groups of cooling roller units 11 can be reduced from top to bottom in sequence to avoid the negative impact of the sudden drop in temperature on the quality of the film, thereby producing a higher quality film.

[0027] Specifically, the first cooling roller 11.2 includes a first cooling roller body 11.2.1 and a first sliding frame 11.2.2, the first sliding frame 11.2.2 is slidably connected to the mounting frame 13, and the first cooling roller body 11.2.1 is rotatably connected to the first sliding frame 11.2.2; the second cooling roller 11.3 includes a second cooling roller body 11.3.1 and a second sliding frame 11.3.2, the second sliding frame 11.3.2 is slidably connected to the mounting frame 13, and the second cooling roller body 11.3.1 is rotatably connected to the second sliding frame 11.3.2. The solution can realize the rotation of the first cooling roller body 11.2.1 and the second cooling roller body 11.3.1 relative to the mounting frame 13, and can also enable the first cooling roller body 11.2.1 and the second cooling roller body 11.3.1 to slide relative to the mounting frame 13.

[0028] The surface of the first cooling roller body 11.2.1 has a low temperature, and the surface of the second cooling roller body 11.3.1 has a low temperature.

[0029] Preferably, one end of the linear drive 11.1 is connected to the first sliding frame 11.2.2, and the other end of the linear drive 11.1 is connected to the second sliding frame 11.3.2. The linear drive 11.1 is a cylinder. The solution controls the first sliding frame 11.2.2 and the second sliding frame 11.3.2 simultaneously through a linear drive 11.1, which simplifies the control process, improves the synchronization of control, and reduces costs. The cylinder has a certain elasticity after being extended, and the clamping force of the first cooling roller 11.2 and the second cooling roller 11.3 can be controlled by controlling the air pressure in the cylinder.

[0030] Preferably, the cooling roller unit 11 further comprises a positioning block 11.4, which is fixed to the mounting frame 13, and is disposed between the first cooling roller 11.2 and the second cooling roller 11.3. A first contact block for contacting the positioning block 11.4 is fixed to the first sliding frame 11.2.2, and a second contact block for contacting the positioning block 11.4 is disposed on the second sliding frame 11.3.2. The positioning block 11.4 can position the first cooling roller 11.2 and the second cooling roller 11.3 when they are close to each other, so as to avoid the contact position of the first cooling roller 11.2 and the second cooling roller 11.3 being too far to the left or too far to the right, and to avoid the contact position being skewed to affect the quality of the multilayer film.

[0031] Specifically, the first cooling roller body 11.2.1 is a hollow structure, and the second cooling roller body 11.3.1 is a hollow structure. Cooling liquid can be passed into the hollow structure to cool the first cooling roller body 11.2.1 and the second cooling roller body 11.3.1, so that the film is cooled by the first cooling roller body 11.2.1 and the second cooling roller body 11.3.1.

[0032] Preferably, a floating roller 12 for tensioning the film is provided between the extruder 2 and the secondary heating device 6 .

[0033] Preferably, a rotating rod 14 is rotatably connected to the frame, one end of which is rotatably mounted with a floating roller 12, and the other end of the rotating rod 13 is driven to rotate by a cylinder 15, and the floating roller 12 is pressed against the surface of the film to adjust the film tension.

[0034] It can be understood that in another embodiment, the linear drive 11.1 may include a first linear drive 11.1 and a second linear drive 11.1, one end of the first linear drive 11.1 is connected to the first sliding frame 11.2.2, the other end of the first linear drive 11.1 is connected to the mounting frame 13, one end of the second linear drive 11.1 is connected to the second sliding frame 11.3.2, and the other end of the second linear drive 11.1 is connected to the mounting frame 13. The solution can control the movement of the first cooling roller 11.2 and the second cooling roller 11.3 respectively by the first linear drive 11.1 and the second linear drive 11.1.

[0035] Embodiment 2:

[0036] like Figure 1 As shown, on the basis of Example 1, the secondary heating device 6 comprises a first heating tube 6.1, a second heating tube 6.2 at least partially sleeved outside the first heating tube 6.1, and a lifting driver 6.3, the first heating tube 6.1 is fixed to the frame, the second heating tube 6.2 is vertically slidably connected to the frame, the lifting driver 6.3 is installed on the frame and is used to drive the second heating tube 6.2 to rise and fall relative to the first heating tube 6.1, and the first heating tube 6.1 and the second heating tube 6.2 are both provided with heating components. The lifting driver 6.3 is an electric push rod.

[0037] In the above technical solution, the lifting driver 6.3 can control the lifting of the second heating cylinder 6.2 relative to the first heating cylinder 6.1, thereby reducing or increasing the overall height of the secondary heating device 6. When the film moving speed remains unchanged, the time for the film to pass through the secondary heating device 6 can be increased or decreased, thereby controlling the heating time of the film by the secondary heating device 6, thereby meeting the secondary heating needs of films of different thicknesses. The electric push rod can relatively accurately control the extension length, thereby relatively accurately controlling the overall height of the secondary heating device 6.

[0038] Embodiment 3:

[0039] On the basis of Example 1, the secondary heating device comprises a first heating tube, a second heating tube at least partially sleeved outside the first heating tube, and a lifting driver, the first heating tube is vertically slidably connected to the frame, the second heating tube is fixed to the frame, the lifting driver is mounted on the frame and is used to drive the first heating tube to rise and fall relative to the second heating tube, and the first heating tube and the second heating tube are both provided with heating components. The lifting driver is an electric push rod.

[0040] In the above technical solution, the lifting driver can control the lifting of the first heating cylinder relative to the second heating cylinder, thereby reducing or increasing the overall height of the secondary heating device. When the film moving speed remains unchanged, the time required for the film to pass through the secondary heating device can be increased or decreased, thereby controlling the heating time of the film by the secondary heating device, thereby meeting the secondary heating needs of films of different thicknesses. The electric push rod can relatively accurately control the extension length, thereby relatively accurately controlling the overall height of the secondary heating device.

Claims

1. A co-extrusion preparation device for a multi-layer film, Its characteristics are: The invention comprises a frame, a secondary heating device, a winding device and a plurality of extruders arranged in parallel installed on the frame, the extrusion port of the extruder is arranged downward, two matching extrusion composite rollers are arranged below the plurality of extrusion ports, a first cooling roller assembly is arranged below the extrusion composite roller, a plurality of first guide rollers are arranged between the first cooling roller assembly and the secondary heating device, two matching secondary pressing rollers are arranged below the secondary heating device, a second cooling roller assembly is arranged below the secondary pressing roller, a plurality of second guide rollers are arranged between the second cooling roller assembly and the winding device, the first cooling roller assembly and the second cooling roller assembly each comprise a mounting frame and a plurality of cooling roller units arranged vertically on the mounting frame, the cooling roller unit comprises a linear drive, a first cooling roller and a second cooling roller, the first cooling roller is connected to the mounting frame in a transverse sliding manner, the second cooling roller is connected to the mounting frame in a transverse sliding manner, and the linear drive is used to drive the first cooling roller and the second cooling roller to approach or move away from each other.

2. A co-extrusion preparation device for a multi-layer film according to claim 1, Its characteristics are: The first cooling roller includes a first cooling roller body and a first sliding frame, the first sliding frame is slidably connected to the mounting frame, and the first cooling roller body is rotatably connected to the first sliding frame; the second cooling roller includes a second cooling roller body and a second sliding frame, the second sliding frame is slidably connected to the mounting frame, and the second cooling roller body is rotatably connected to the second sliding frame.

3. A co-extrusion preparation device for a multi-layer film according to claim 2, Its characteristics are: One end of the linear drive is connected to the first sliding frame, and the other end of the linear drive is connected to the second sliding frame.

4. A co-extrusion preparation device for a multi-layer film according to claim 2, Its characteristics are: The linear drive includes a first linear drive and a second linear drive, wherein one end of the first linear drive is connected to the first sliding frame, and the other end of the first linear drive is connected to the mounting frame, and one end of the second linear drive is connected to the second sliding frame, and the other end of the second linear drive is connected to the mounting frame.

5. A co-extrusion preparation device for a multi-layer film according to claim 1, Its characteristics are: The cooling roller unit also includes a positioning block, which is fixed to the mounting frame. The positioning block is arranged between the first cooling roller and the second cooling roller. A first contact block for contacting the positioning block is fixed on the first sliding frame, and a second contact block for contacting the positioning block is provided on the second sliding frame.

6. A co-extrusion preparation device for a multi-layer film according to claim 1, Its characteristics are: The secondary heating device includes a first heating tube, a second heating tube at least partially sleeved on the outside of the first heating tube, and a lifting drive, wherein the first heating tube is fixed to the frame, the second heating tube is vertically slidably connected to the frame, the lifting drive is installed on the frame and is used to drive the second heating tube to rise and fall relative to the first heating tube, and heating components are provided in the first heating tube and the second heating tube.

7. A co-extrusion preparation device for a multi-layer film according to claim 1, Its characteristics are: The secondary heating device includes a first heating tube, a second heating tube at least partially sleeved on the outside of the first heating tube, and a lifting driver. The first heating tube is vertically slidably connected to the frame, the second heating tube is fixed to the frame, the lifting driver is installed on the frame and is used to drive the first heating tube to rise and fall relative to the second heating tube. Heat generation components are provided in both the first heating tube and the second heating tube.

8. A co-extrusion preparation device for a multi-layer film according to claim 6 or 7, Its characteristics are: The lifting drive is an electric push rod.

9. A co-extrusion preparation device for a multi-layer film according to any one of claims 2 to 4, Its characteristics are: The first cooling roller body is a hollow structure, and the second cooling roller body is a hollow structure.

10. A co-extrusion preparation device for a multi-layer film according to any one of claims 1 to 4, Its characteristics are: A floating roller for tensioning the film is arranged between the extruder and the secondary heating device.

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