Return device for transversely stretching polyimide film
By tilting the return track and installing a cover, air inlet, and exhaust outlet on it, the cooling problem of the polyimide film return device at high temperatures is solved, ensuring film quality and achieving efficient cleaning effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-16
- Publication Date
- 2026-03-24
AI Technical Summary
Existing polyimide film transverse stretching return devices have poor cooling performance in high-temperature environments, and impurities on the clamping device affect the film stretching quality.
Design a tilted return track with a cover on the track. The cover has an air inlet and an air outlet. The airflow moves inside the cover to extend the flow distance and contact area, and the nozzle cleaner removes impurities.
It improves the cooling effect of the return track, effectively removes impurities from the clamping device, and ensures the quality of film stretching.
Smart Images
Figure CN224028378U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of film stretching, concretely to a kind of polyimide film transverse stretching's return device. BACKGROUND
[0002] Polyimide (PI) film has good mechanical, thermal and electrical insulation performance, and is widely used in aerospace, microelectronics and other fields. During production, PI film undergoes high-temperature transverse stretching process to orient molecular chains and improve its performance. Specifically, before entering the transverse stretching section, the edges of PI film are fixed by clamping devices such as needle plate or chain clamp. Then, it is sent into a high-temperature oven along a circular track and stretched transversely. After the PI film comes out of the high-temperature section and is peeled off from the clamping device, the needle plate or chain clamp will run along the return track back to the entrance of the transverse stretching section, and so on.
[0003] Generally, after the clamping device comes out of the transverse stretching section, its temperature is relatively high due to the high-temperature process. When it circulates to the entrance of the transverse stretching section to clamp PI film again, it is easy to cause edge rupture. Therefore, a cooling device is arranged on the return track to help the needle plate or chain clamp cool down during the return process. There are two common ways to arrange the return track. One is to arrange the return track and the outgoing track in the high-temperature oven at the same time to save space. However, a cooling device such as circulating cold water needs to be arranged inside the circular track to help the clamping device cool down. The overall equipment is difficult to process and has high cost. Moreover, the cooling effect in the high-temperature oven is poor. Figure 1 Therefore, someone moves the return track parallel to the high-temperature oven, as shown in FIG. 2. The dashed part is the outgoing track 10, which is located in the high-temperature oven 30. The return track 20 is opposite to the outgoing track. The movement direction of the clamping device is shown by the arrow. Although the cooling effect is improved in this way, it still cannot meet people's higher requirements. SUMMARY
[0004] To solve the above technical problems, the utility model provides a kind of polyimide film transverse stretching's return device to solve the above technical problems.
[0005] To achieve the above utility model purposes, the technical solutions provided by the utility model are as follows:
[0006] A kind of polyimide film transverse stretching's return device, comprising return track, the return track is obliquely arranged, one end height is greater than the height of the other end;A cover body is arranged on the return track, an air inlet and an air outlet are arranged on the cover body, and the air outlet is located at the end of the cover body close to the return track with lower height.
[0007] Optionally, the air inlet is a plurality of.
[0008] Optionally, the air inlet is located below the return track.
[0009] Optionally, the air inlet is located above the return track.
[0010] Optionally, further comprising a liquid inlet and a liquid outlet, the cover body is provided with a spray head in communication with the liquid inlet, and the air inlet is located between the spray head and the air outlet.
[0011] The return device for polyimide film transverse stretching provided by the utility model, by setting the return track to be inclined, setting the cover body on the return track, and setting the air inlet and the air outlet on the cover body, the air outlet is located at the end of the cover body close to the return track with lower height, so that the air inlet air flow has relatively long distance when cooling the return track, the air flow has larger contact area with the return track or longer contact time, and the cooling effect is better, and the requirement of people can be better met.
[0012] In addition, the impurities (such as film fragments generated by peeling, carbonized residues of lubricating oil, etc.) on the return track and the clamping device can be blown off in the process that the air flow moves in the cover body, and the impurities are discharged through the air outlet, so that the impurities are prevented from adhering to affect the quality of subsequent film stretching. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 A use state schematic view of the existing return device for polyimide film transverse stretching is shown.
[0014] Figure 2 A use state schematic view of the return device for polyimide film transverse stretching in the embodiment is shown.
[0015] Figure 3 One of the structure schematic views of the annular guide rail in the embodiment is shown.
[0016] Figure 4 The other of the structure schematic views of the annular guide rail in the embodiment is shown.
[0017] Markings in the drawings:
[0018] The outgoing track 10, the return track 20, the oven 30, the cover body 40, the air inlet 50, the air outlet 60, the connecting track 70, the liquid inlet 80, the liquid outlet 90, and the spray head 100. DETAILED DESCRIPTION
[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0020] For examples, please refer to Figure 2 and Figure 3 The return device for the transverse stretching of the polyimide film in this embodiment includes a return track 20, which is inclined and has a height at one end greater than that at the other end; in actual production, such as Figure 2 As shown, a forward track 10 is provided inside the oven 30, and connecting tracks 70 are provided at both ends of the forward track. The connecting tracks are connected to the ends of the corresponding return tracks so that the forward track, the two connecting tracks and the return track form a ring track. The ring track is set vertically to reduce the space occupied on the side of the oven. A cover 40 is provided on the return track. The cover is provided with an air inlet 50 and an exhaust outlet 60. The exhaust outlet is located at the end of the cover that is closer to the lower height of the return track.
[0021] The aforementioned return device for transverse stretching of polyimide film is designed with an inclined return track and a cover 40 on the return track. The cover has an air inlet 50 and an exhaust outlet 60. The exhaust outlet is located at the end of the cover closer to the lower end of the return track. This allows the airflow to travel a relatively long distance when the air inlet cools the return track, resulting in a larger contact area or longer contact time between the airflow and the return track. Especially when multiple air inlets are provided and corresponding air outlets are provided, the cooling effect is better and can better meet people's requirements. In addition, during the movement of the airflow within the cover, it can blow away impurities (such as film fragments generated during peeling, carbonized residue of lubricating oil, etc.) on the return track and clamping device, and discharge them through the exhaust outlet to prevent impurities from adhering and affecting the subsequent film stretching quality.
[0022] In actual manufacturing, the air inlets can be set to two or more, so that air can be blown onto the return track from multiple positions during air intake, thereby improving the removal effect of impurities. The air inlets can be located below or above the return track; no specific limitation is made here. An exhaust port can also be provided at the end of the cover near the higher end of the return track to facilitate rapid exhaust.
[0023] As a preferred embodiment, the device further comprises a liquid inlet 80 and a liquid outlet 90, and a spray head 100 is arranged in the cover and communicates with the liquid inlet, and the air inlet is located between the spray head and the air outlet; the liquid outlet is located at the end of the return rail with higher height. The structure is used for cleaning after the film stretching operation is completed, wherein the liquid inlet is used for entering volatile cleaning agent (such as ethanol), and the cleaning agent is sprayed to the return rail under the action of the spray head, and after absorbing the residual heat of the return rail, it is quickly volatilized and instantly rises, so that the impurities such as broken film are more easily separated from the return rail.
[0024] In actual production, a temperature measuring device (such as a temperature sensor) can also be installed on the annular rail to facilitate understanding of the temperature of the rail.
[0025] It should be noted that the terms "one embodiment", "an embodiment", "exemplary embodiment", "some embodiments", and the like, in the specification mean that a particular feature, structure, or characteristic described in connection with the embodiment can be included in the technology of the present disclosure, but not necessarily every embodiment. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when a particular feature, structure or characteristic is described in connection with an embodiment, it is within the knowledge of those skilled in the art to implement such feature, structure or characteristic in connection with other embodiments whether explicitly described or not.
[0026] It should be readily understood that "on", "above", and "over" in the present disclosure should be interpreted in the broadest way, so that "on" not only means "directly on", but also includes the meaning of "on" with intermediate features or layers therebetween, and "above" or "over" not only includes the meaning of "above" or "over", but also includes the meaning of "above" or "over" without intermediate features or layers therebetween (i.e., directly on).
[0027] In addition, spatial relative terms can be used herein for ease of description, such as "below", "under", "beneath", "above", "over", and the like, to describe a relationship of one element or feature to another element or feature as shown in the drawings. The spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientations shown in the drawings. The device can have other orientations (rotated 90 degrees or in other orientations), and the spatial relative terms used herein can also be interpreted accordingly.
[0028] It needs to be explained that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.
[0029] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.
Claims
1. A return path device for transversely stretching a polyimide film, comprising a return path rail (20), characterized in that, The return track is arranged in an inclined manner, one end of which is higher than the other end. A cover (40) is arranged on the return track, the cover is provided with an air inlet (50) and an air outlet (60), and the air outlet is located at the end of the cover close to the lower end of the return track.
2. The traverse device for polyimide film transverse stretching according to claim 1, wherein The air inlet is multiple.
3. The take-up device for transverse stretching of a polyimide film according to claim 1 or 2, characterized in that, The air inlet is located below the return track.
4. The take-up device for transverse stretching of a polyimide film according to claim 1 or 2, characterized by The air inlet is located above the return track.
5. The polyimide film transverse stretching return means according to claim 1, wherein Further comprising a liquid inlet (80) and a liquid outlet (90), a spray head (100) is arranged in the cover and communicates with the liquid inlet, and the air inlet is located between the spray head and the air outlet. The liquid outlet is located at the higher end of the return track.