A cooling device for polyimide film production

Abstract

The utility model discloses a kind of cooling device for polyimide film production, belong to film production equipment technical field, including cooling box and polyimide film, the one end of cooling box is equipped with feed inlet, its other end is equipped with discharge port, the polyimide film is sequentially passed through feed inlet, cooling box interior and discharge port;The cooling box includes middle chamber and two side chambers, and the middle chamber is located between two side chambers;Cooling mechanism, the cooling mechanism includes the refrigerator of being set in middle chamber side face, and the gas outlet pipe is communicated between the gas outlet end of refrigerator and middle chamber.This utility model, polyimide film moves along the path of feed inlet place side chamber, middle chamber and discharge port place side chamber, accurate regulation and control to the cooling air volume of two side chambers is combined flow control valve, form gradient cooling process of slow cooling, strong cooling and slow cooling, avoid because temperature abrupt change leads to polyimide film to produce stress, wrinkle or cracking, adapt to the high requirement of polyimide film to cooling stability.

Description

Technical Field

[0001] This utility model belongs to the technical field of film production equipment, and in particular relates to a cooling device for polyimide film production. Background Technology

[0002] Polyimide film, a polymer material with high temperature resistance, high insulation, and excellent mechanical properties, is widely used in microelectronics, motor insulation, aerospace, and other fields. During its production, after molding and stretching, the film requires cooling and shaping. The cooling effect directly affects the film's flatness, mechanical properties, and finished product yield. Therefore, the cooling device is one of the key pieces of equipment in a polyimide film production line. Typically, a chiller is used to deliver cold air to cool the film, ensuring that it can stably maintain its post-molding structure and properties to meet the needs of subsequent processing and applications.

[0003] In existing technologies, a cooling chamber, four chillers, and a dense cold air injection port are used to extend the residence time of the film in the chamber, thereby achieving rapid and uniform cooling of the polyimide film. However, this method not only increases the cost of equipment purchase and long-term maintenance due to the multiple chillers, but also lacks a cooling gradient design, which can easily lead to stress concentration due to the lack of temperature transition, resulting in quality problems such as wrinkles and cracks. Summary of the Invention

[0004] The purpose of this invention is to propose a cooling device for polyimide film production, in order to solve the problems in traditional technology where multiple refrigeration units not only increase equipment procurement and long-term maintenance costs, but also lack a cooling gradient design, which easily leads to stress concentration due to the lack of temperature transition.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A cooling device for polyimide film production, comprising: A cooling box and a polyimide film are provided. The cooling box has an inlet at one end and an outlet at the other end. The polyimide film passes through the inlet, the interior of the cooling box, and the outlet in sequence. The cooling chamber includes a central chamber and two side chambers, with the central chamber located between the two side chambers. The cooling mechanism includes a refrigeration unit disposed on the side of the central chamber. An air outlet pipe is connected between the air outlet end of the refrigeration unit and the central chamber. A connecting bend pipe is connected between the side of the central chamber away from the air outlet pipe and two side chambers. A return air pipe is connected between the end of each of the two side chambers away from the connecting bend pipe and the air inlet end of the refrigeration unit.

[0006] Preferably, both the inlet and outlet are equipped with roller assemblies, and the polyimide film passes sequentially through the roller assemblies at the inlet and outlet.

[0007] Preferably, two partition plates are fixedly connected inside the cooling box, and the middle chamber and two side chambers are formed by the two partition plates separating the interior of the cooling box. Each of the two partition plates has an opening for the polyimide film to pass through.

[0008] Preferably, a filter assembly is connected in series in the middle of the return air pipe to filter impurities and moisture carried by the cold air in the return air pipe, and the air inlet end of the filter assembly is connected to an air inlet pipe.

[0009] Preferably, temperature sensors are installed on the inner walls of the central chamber and the two side chambers, and a controller is installed on the cooling box. The refrigerator and the temperature sensors are electrically connected to the controller, and the controller receives signals from the temperature sensors to control the working status of the refrigerator.

[0010] Preferably, the inner walls of the central chamber and the two side chambers are provided with guide channels, the guide channels are distributed along the vertical plane, the bottoms of the multiple guide channels are connected to the same collection channel, and one end of the collection channel is connected to a drain pipe.

[0011] Compared with the prior art, the present invention has the following beneficial effects: 1. In this utility model, a single refrigeration unit is used in conjunction with air circulation to replace the traditional multi-refrigeration unit cooling mode, which reduces the purchase, installation and maintenance costs of refrigeration equipment, simplifies the pipeline layout and reduces the probability of system failure. The polyimide film moves along the path of the side chamber at the inlet, the middle chamber and the side chamber at the outlet. Combined with the precise control of the amount of cold air in the two chambers by the flow control valve, a gradient cooling process of slow cooling, strong cooling and slow cooling is formed, which avoids stress, wrinkles or cracks in the polyimide film caused by sudden temperature changes. It is adapted to the high requirements of the polyimide film for cooling stability and improves the finished product qualification rate.

[0012] 2. In this utility model, by means of the linkage between the temperature sensor and the controller, the temperature difference between the middle chamber and the two side chambers can be flexibly adjusted by adjusting the flow control valve on the connecting bend, so as to meet the cooling requirements of polyimide films of different thicknesses and production speeds, thereby enhancing the versatility and practicality of the equipment; the return air pipe, together with the filter assembly, realizes the recovery and reuse of cold air, reducing the energy consumption of refrigeration; the inlet air pipe replenishes the leaked air to maintain the stability of the circulation pressure, thereby reducing the ineffective loss of cold air. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of a cooling device for polyimide film production proposed in this utility model; Figure 2 This is a partial sectional view of the cooling box of a cooling device for producing polyimide film according to the present invention; Figure 3 This is a horizontal sectional view of the cooling box of a cooling device for producing polyimide film according to the present invention.

[0014] In the diagram: 1. Cooling box; 2. Feed inlet; 3. Discharge outlet; 4. Roller assembly; 5. Divider plate; 6. Middle chamber; 7. Side chamber; 8. Refrigeration unit; 9. Air outlet pipe; 10. Connecting bend pipe; 11. Air return pipe; 12. Filter assembly; 13. Air inlet pipe; 14. Temperature sensor; 15. Controller; 16. Guide channel; 17. Drain pipe. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0016] Reference Figures 1-3 A cooling device for producing polyimide films, comprising: The cooling box 1 and the polyimide film are provided. One end of the cooling box 1 has an inlet 2 and the other end has an outlet 3. The polyimide film passes through the inlet 2, the interior of the cooling box 1 and the outlet 3 in sequence.

[0017] Both the inlet 2 and the outlet 3 are equipped with roller assemblies 4, and the polyimide film passes through the roller assemblies 4 at the inlet 2 and the outlet 3 in sequence.

[0018] The roller assembly 4 includes two rollers arranged symmetrically at the top and bottom. The rollers are rotatably connected to the cooling box 1. The polyimide film passes through the space between the two rollers. The fit between the rollers and the polyimide film reduces the gap between the feed inlet 2 and the discharge outlet 3, thereby reducing the amount of cold air leakage.

[0019] The cooling chamber 1 includes a central chamber 6 and two side chambers 7, with the central chamber 6 located between the two side chambers 7.

[0020] The cooling box 1 is fixedly connected to two partition plates 5. The middle chamber 6 and two side chambers 7 are formed by the two partition plates 5 separating the interior of the cooling box 1. Both partition plates 5 are provided with openings for polyimide films to pass through.

[0021] The partition plate 5 is made of heat-insulating material, which can reduce heat exchange between the middle chamber 6 and the side chamber 7, maintain the temperature gradient of each chamber, and the height of the opening is adapted to the thickness of the polyimide film to ensure that the polyimide film passes through smoothly while reducing the crossflow of cold air between chambers and ensuring the stability of the cooling gradient.

[0022] The cooling mechanism includes a refrigeration unit 8 disposed on the side of the central chamber 6. An air outlet pipe 9 is connected between the air outlet end of the refrigeration unit 8 and the central chamber 6. A connecting bend pipe 10 is connected between the side of the central chamber 6 away from the air outlet pipe 9 and the two side chambers 7. A return air pipe 11 is connected between the end of the two side chambers 7 away from the connecting bend pipe 10 and the air inlet end of the refrigeration unit 8.

[0023] The cooling mechanism achieves cold air circulation through a single refrigeration unit 8. The low-temperature cold air generated by the refrigeration unit 8 is directly sent into the middle chamber 6 through the outlet pipe 9 to perform high-intensity cooling on the thin film. The cold air in the middle chamber 6 is diverted to the two side chambers 7 through the connecting bend pipe 10. At this time, the temperature of the cold air rises slightly due to absorbing some heat, forming low-intensity cooling in the side chambers 7. Finally, the cold air in the side chambers 7 flows back to the refrigeration unit 8 through the return pipe 11 to re-cool and complete the cycle. Compared with the structure of multiple refrigeration units 8, the equipment cost is greatly reduced. At the same time, a stable cooling gradient is formed by the natural attenuation of the air path.

[0024] The exhaust pipe 9, connecting bend 10, and return pipe 11 are all connected to the cooling box 1 through a conical cover to improve the stability of cold air flow.

[0025] A filter assembly 12 is connected in series in the middle of the return air pipe 11 to filter impurities and water vapor carried by the cold air in the return air pipe 11. The air inlet end of the filter assembly 12 is connected to the air inlet pipe 13.

[0026] The filter assembly 12 is equipped with a filter screen and desiccant, which can intercept impurities and moisture carried in the air circulation and prevent them from entering the refrigeration unit 8 and causing equipment blockage or corrosion. The air intake pipe 13 introduces fresh air from the outside to replenish the air lost in the circulation air path.

[0027] Temperature sensors 14 are installed on the inner walls of the middle chamber 6 and the two side chambers 7. A controller 15 is installed on the cooling box 1. The refrigerator 8 and the temperature sensors 14 are electrically connected to the controller 15. The controller 15 receives the signal from the temperature sensors 14 and controls the working status of the refrigerator 8.

[0028] Temperature sensor 14 monitors the temperature in the middle chamber 6 and side chamber 7 in real time and transmits the data to controller 15. When the monitored temperature is higher than the target value, controller 15 controls the refrigerator 8 to increase the cooling power, and vice versa, to ensure that the temperature of each chamber is stable within the preset gradient range and to adapt to the cooling needs of films of different thicknesses.

[0029] A flow control valve is installed on the connecting bend 10. The flow control valve is electrically connected to the controller 15. The controller 15 can adjust the opening of the flow control valve according to the temperature difference data between the middle chamber 6 and the side chamber 7 detected by the temperature sensor 14, thereby accurately controlling the cooling gradient between the middle chamber 6 and the side chamber 7. This changes the passive natural cooling gradient generated by the gas path attenuation to an active cooling gradient controlled by the flow control valve.

[0030] When the temperature sensor 14 detects that the temperature difference between the middle chamber 6 and the side chamber 7 is less than the preset value, the controller 15 controls the flow control valve to increase the opening, thereby increasing the amount of cold air input to the side chamber 7 to lower the temperature of the side chamber 7 and widen the temperature difference. When the temperature difference is greater than the preset value, the controller 15 controls the flow control valve to decrease the opening, thereby reducing the amount of cold air input to the side chamber 7 to raise the temperature of the side chamber 7 and narrow the temperature difference, ultimately achieving a stable and controllable cooling gradient.

[0031] The inner walls of the central chamber 6 and the two side chambers 7 are provided with guide channels 16. The guide channels 16 are distributed along the vertical plane. The bottom of multiple guide channels 16 are connected to the same collection channel. One end of the collection channel is connected to a drain pipe 17.

[0032] The guide channel 16 can guide the condensate to flow along the vertical plane to the bottom of the cooling box 1, and the drain pipe 17 will discharge the collected condensate, effectively preventing moisture from entering the air path and affecting the circulation cooling efficiency.

[0033] During operation, the polyimide film is fed into the cooling box 1 through the roller assembly 4 of the feed inlet 2, then passes through the side chamber 7 near the feed inlet 2, then enters the middle chamber 6, and finally passes through the side chamber 7 near the discharge outlet 3 and is discharged from the roller assembly 4 of the discharge outlet 3. The roller assembly 4 synchronously guides the polyimide film to move at a uniform speed, reducing the leakage of cold air from the gaps between the inlet and outlet.

[0034] The refrigerator 8 generates low-temperature cold air, which is sent directly into the middle chamber 6 through the outlet pipe 9 to form the core strong cooling zone. The cold air in the middle chamber 6 is distributed to the side chambers 7 on both sides through the connecting bend pipe 10 with a flow control valve to form a slow cooling zone. The cold air in the side chambers 7 is then returned to the refrigerator 8 through the return pipe 11 to complete the circulation. At the same time, the inlet pipe 13 replenishes the air leaked due to the gaps to maintain stable air pressure.

[0035] Temperature sensors 14 in the middle chamber 6 and the two side chambers 7 monitor the temperature in real time and transmit the data to the controller 15. If the temperature difference between the middle chamber 6 and the side chambers 7 deviates from the preset value, the controller 15 adjusts the opening of the flow control valve on the connecting bend 10 to ensure that the polyimide film passes through the slowly cooled side chamber 7, the slowly cooled middle chamber 6 and another slowly cooled side chamber 7 in sequence, and transitions smoothly to avoid sudden temperature changes.

[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A cooling device for producing polyimide films, characterized in that, include: A cooling box (1) and a polyimide film are provided. One end of the cooling box (1) is provided with a feed inlet (2) and the other end is provided with a discharge outlet (3). The polyimide film passes through the feed inlet (2), the interior of the cooling box (1) and the discharge outlet (3) in sequence. The cooling box (1) includes a central chamber (6) and two side chambers (7), with the central chamber (6) located between the two side chambers (7); The cooling mechanism includes a refrigerator (8) disposed on the side of the central chamber (6). An air outlet pipe (9) is connected between the air outlet end of the refrigerator (8) and the central chamber (6). A connecting bend pipe (10) is connected between the side of the central chamber (6) away from the air outlet pipe (9) and the two side chambers (7). A return pipe (11) is connected between the end of the two side chambers (7) away from the connecting bend pipe (10) and the air inlet end of the refrigerator (8).

2. The cooling device for polyimide film production according to claim 1, characterized in that, Both the feed inlet (2) and the discharge outlet (3) are equipped with roller assemblies (4), and the polyimide film passes through the roller assemblies (4) at the feed inlet (2) and the discharge outlet (3) in sequence.

3. The cooling device for polyimide film production according to claim 1, characterized in that, The cooling box (1) is fixedly connected to two partition plates (5). The middle chamber (6) and the two side chambers (7) are formed by the two partition plates (5) separating the interior of the cooling box (1). Both partition plates (5) are provided with openings for polyimide films to pass through.

4. A cooling device for polyimide film production according to claim 3, characterized in that, A filter assembly (12) is connected in series in the middle of the return air pipe (11) to filter impurities and water vapor carried by the cold air in the return air pipe (11). The air inlet end of the filter assembly (12) is connected to an air inlet pipe (13).

5. A cooling device for polyimide film production according to claim 4, characterized in that, Temperature sensors (14) are installed on the inner walls of the middle chamber (6) and the two side chambers (7). A controller (15) is installed on the cooling box (1). The refrigerator (8) and the temperature sensors (14) are electrically connected to the controller (15). The controller (15) receives the signal from the temperature sensors (14) and controls the working state of the refrigerator (8).

6. A cooling device for polyimide film production according to claim 3, characterized in that, The inner walls of the central chamber (6) and the two side chambers (7) are provided with guide channels (16). The guide channels (16) are distributed along the vertical plane. The bottom of the multiple guide channels (16) are connected to the same collection channel. One end of the collection channel is connected to a drain pipe (17).

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