Longitudinal stretching device for film production
By using inlet and outlet traction roller sets in conjunction with the drive mechanism in the longitudinal stretching machine, and by using a torque motor and cylinder to adjust the film tension, the problem of unstable tension of polyimide film during stretching is solved, thereby improving production efficiency and quality and reducing equipment costs.
Patent Information
- Application Number
- CN202423311614.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-12-31
AI Technical Summary
Existing polyimide films are soft and have limited tension when they are first peeled from the casting machine during stretching. This makes the tension sensor insensitive and difficult to control effectively, affecting production quality and efficiency, and also resulting in high equipment costs.
The longitudinal stretching machine includes a horizontally set worktable and multiple sets of rollers. The inlet and outlet traction rollers work in conjunction with the drive mechanism, and the tension of the film is adjusted by a torque motor and a cylinder to achieve automatic compensation and ensure tension stability.
It enables automatic adjustment of film tension, improves production efficiency and product quality stability, and reduces equipment costs.
Smart Images
Figure CN223618234U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of film stretching equipment technology, and more specifically, to a longitudinal stretching device for film production. Background Technology
[0002] With the growth of the national economy and the rapid development of various fields such as 5G communications, information appliances, and new electronic components in China, the consumption of polyimide film has been significantly boosted. As an important organic engineering film, polyimide film possesses advantages such as heat resistance, high strength, high modulus, dimensional stability, and the ability to be processed continuously over large areas. It has broad application prospects in flexible electronic materials, microelectronic packaging, and other fields, and is a crucial basic insulating material for the electrical and electronic industries. With the rise and development of related industries, the market demand for polyimide film has increased significantly year by year, placing higher standards and requirements on its production equipment.
[0003] The production process of polyimide film includes processes such as casting, longitudinal stretching, transverse stretching, edge trimming, and winding. In actual production, the polyimide film produced in the initial stage is relatively thick and needs to be stretched using a longitudinal stretching device to obtain film products that meet the requirements of actual applications. Longitudinal stretching mainly refers to the longitudinal stretching operation of the film using stretching rollers with different speeds.
[0004] Currently, existing polyimide films suffer from the following problems during stretching: The polyimide film is soft immediately after being peeled from the casting machine, limiting its tensile strength. Insufficient tension prevents the film from being successfully peeled and rewound onto the casting machine; this necessitates equipment shutdown, resulting in significant time consumption, material waste, and even production delays. Existing technologies typically employ a combination of tension sensors and servo motors to control film tension for precise adjustment. However, in practical applications, tension sensors become insensitive when the film tension is low, hindering effective tension control and impacting the production quality and efficiency of the polyimide film. Furthermore, this adjustment method suffers from high equipment costs, leading to high production input costs.
[0005] Therefore, there is an urgent need for an economical longitudinal stretching device for film production to solve the problem of film tension fluctuation, so as to ensure production efficiency and quality. Utility Model Content
[0006] To address the aforementioned problems, the present invention provides a longitudinal stretching device for film production, which solves the issues of insensitive adjustment and high equipment cost in existing longitudinal stretching devices when the film tension is low. The device includes a longitudinal stretching machine, which comprises a horizontally arranged worktable. Along the film's forward direction, the worktable is sequentially equipped with an inlet traction roller group, multiple sets of drive roller groups, and an outlet traction roller group. The inlet traction roller group is connected to a first drive mechanism, and the outlet traction roller group is connected to a second drive mechanism. The driving speed of the first drive mechanism is greater than the maximum film conveying speed.
[0007] Preferably, a drooling machine is provided on one side of the longitudinal stretching machine. The drooling machine is equipped with a large rotating roller, a peeling roller and multiple guide rollers in sequence. The film is conveyed to the inlet traction roller group through the large rotating roller, the peeling roller and the multiple guide rollers.
[0008] Preferably, the inlet traction roller group includes two inlet traction rollers that are linked vertically, one of which is connected to the output shaft of the first drive mechanism.
[0009] Preferably, the outlet traction roller group includes three linked outlet traction rollers, one of which is connected to the output shaft of the second drive mechanism.
[0010] Preferably, a transverse stretching machine is provided on one side of the longitudinal stretching machine, and a swing roller group is provided between the outlet traction roller group and the transverse stretching machine. The film is conveyed to the transverse stretching machine through the outlet traction roller group and the swing roller group.
[0011] Preferably, the oscillating roller assembly includes an oscillating roller and an upper swing arm connected together, and the upper swing arm is connected to a third drive mechanism.
[0012] Preferably, multiple sets of drive rollers are evenly spaced.
[0013] Preferably, the transmission roller assembly includes an upper transmission roller and a lower transmission roller, and both the upper and lower transmission rollers are equipped with heating tubes.
[0014] The beneficial effects of this invention are as follows: The longitudinal stretching machine's worktable is equipped with an inlet traction roller group, which is connected to a first drive mechanism. The drive speed of the first drive mechanism is greater than the maximum speed of film conveying. When the film speed and tension fluctuate, the first drive mechanism can respond promptly to these changes, automatically accelerating or decelerating to compensate and maintain stable tension during film conveying and stretching. This requires no manual intervention, is highly efficient and stable, and features a simple structure and low equipment cost. When the film tension is low, the first drive mechanism can also automatically compensate for tension fluctuations in a timely manner, ensuring that the film always maintains a relatively stable tension state, thus improving product quality stability and production efficiency. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a schematic diagram of the structure of this utility model.
[0017] Symbols in the diagram: 1. Longitudinal stretching machine; 2. Workbench; 3. Inlet traction roller group; 4. Transmission roller group; 5. Outlet traction roller group; 6. First drive mechanism; 7. Second drive mechanism; 8. Saliva machine; 9. Large rotating roller; 10. Peeling roller; 11. Guide roller; 12. Transverse stretching machine; 13. Swinging roller group. Detailed Implementation
[0018] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.
[0019] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0020] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0021] The present application will now describe a longitudinal stretching apparatus for thin film production provided in an embodiment.
[0022] Please see Figure 1This is a schematic diagram of the structure of the present invention. The longitudinal stretching device for film production includes a longitudinal stretching machine 1, which includes a horizontally arranged worktable 2. The worktable 2 is sequentially provided with an inlet traction roller group 3, multiple sets of transmission roller groups 4, and an outlet traction roller group 5 along the film's forward direction. The inlet traction roller group 3 is connected to a first drive mechanism 6, and the outlet traction roller group 5 is connected to a second drive mechanism 7. The driving speed of the first drive mechanism 6 is greater than the maximum speed of film conveying. The first drive mechanism 6 drives the inlet traction roller group 3 to rotate, and the second drive mechanism 7 drives the outlet traction roller group 5 to rotate. The longitudinal stretching of the film is achieved through the speed difference between the inlet traction roller group 3 and the outlet traction roller group 5.
[0023] In this embodiment, the first drive mechanism 6 is specifically a torque motor. The torque motor, in conjunction with a reducer, adjusts the rotational speed of the inlet traction roller group 3 to ensure stable film tension at the inlet of the longitudinal stretching machine 1. Specifically, during selection, the speed of the torque motor is set to be greater than the maximum film conveying speed, ensuring that the torque of the torque motor is greater than or equal to the film tension. When the film speed and tension fluctuate, a sufficiently large torque allows the torque motor to respond promptly to these changes, automatically accelerating or decelerating to compensate and maintain stable tension during film conveying and stretching. This requires no manual intervention, is highly efficient and stable, and features a simple device structure and low equipment cost. When the film tension is low, the torque motor can also automatically compensate for tension fluctuations in a timely manner, ensuring that the film always maintains a relatively stable tension state, improving product quality stability and production efficiency.
[0024] Furthermore, a casting machine 8 is provided on one side of the longitudinal stretching machine 1. The casting machine 8 is equipped with a large rotating roller 9, a peeling roller 10, and multiple guide rollers 11 in sequence. The film is conveyed to the inlet traction roller group 3 through the large rotating roller 9, the peeling roller 10, and the multiple guide rollers 11. The polyimide film is peeled off from the steel strip on the large rotating roller 9, passes through the peeling roller 10 and the multiple guide rollers 11, and enters the longitudinal stretching machine 1. It is then longitudinally stretched by the inlet traction roller group 3, multiple sets of transmission roller groups 4, and the outlet traction roller group 5 of the longitudinal stretching machine 1.
[0025] Furthermore, the inlet traction roller group 3 includes two inlet traction rollers that are linked vertically, one of which is connected to the output shaft of the first drive mechanism 6. Specifically, the tension of the film between the casting machine 8 and the longitudinal stretching machine 1 is automatically adjusted by regulating the speed of the inlet traction roller through the first drive mechanism 6.
[0026] Furthermore, the outlet traction roller group 5 includes three linked outlet traction rollers, one of which is connected to the output shaft of the second drive mechanism 7.
[0027] Furthermore, a transverse stretching machine 12 is provided on one side of the longitudinal stretching machine 1, and a swing roller group 13 is provided between the outlet traction roller group 5 and the transverse stretching machine 12. The film is conveyed to the transverse stretching machine 12 through the outlet traction roller group 5 and the swing roller group 13.
[0028] Furthermore, the oscillating roller group 13 includes an oscillating roller and an upper swing arm connected together, and the upper swing arm is connected to a third drive mechanism. In this embodiment, the third drive mechanism is specifically a drive cylinder. The operator adjusts the pressure of the cylinder to set different tensions. When the film tension fluctuates, the upper swing arm swings to automatically compensate, so as to stabilize the film tension between the outlet traction roller group 5 and the transverse stretching machine 12.
[0029] Furthermore, multiple sets of drive rollers are evenly spaced.
[0030] Specifically, the transmission roller group 4 includes an upper transmission roller and a lower transmission roller, and both the upper and lower transmission rollers are equipped with heating tubes.
[0031] The working process of this utility model is as follows: The polyimide film is peeled off from the steel strip on the large rotating roller 9, and after passing through the peeling roller 10 and multiple guide rollers 11, it enters the inlet traction roller group 3 of the longitudinal stretching machine 1. When selecting the model, the operator sets the speed of the torque motor to be greater than the maximum speed of film conveying. When the speed and tension of the film fluctuate, the torque motor responds to these changes in time and adjusts the rotation speed of the inlet traction roller group 3 to ensure the stability of the film tension at the inlet of the longitudinal stretching machine 1. The film continues to pass through multiple sets of transmission roller groups 4, the outlet traction roller group 5, and the swing roller group 13 into the transverse stretching machine 12. The operator sets different tensions by adjusting the cylinder pressure of the swing roller group 13. When the film tension fluctuates, the upper swing arm of the swing roller group 13 swings to automatically compensate, thereby stabilizing the film tension between the outlet traction roller group 5 and the transverse stretching machine 12.
[0032] In this invention, the worktable 2 of the longitudinal stretching machine 1 is equipped with an inlet traction roller group 3, which is connected to a first drive mechanism 6. The driving speed of the first drive mechanism 6 is greater than the maximum speed of film conveying. When the speed and tension of the film fluctuate, the first drive mechanism 6 can respond to these changes in a timely manner, automatically accelerating or decelerating to compensate and maintain stable tension during film conveying and stretching. No manual intervention is required, making it highly efficient and stable. The device has a simple structure and low equipment cost. When the film tension is low, the first drive mechanism 6 can also automatically compensate for tension fluctuations in a timely manner, ensuring that the film always maintains a relatively stable tension state, improving product quality stability and production efficiency.
[0033] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.
Claims
1. A longitudinal stretching apparatus for film production, comprising a longitudinal stretching machine, wherein the longitudinal stretching machine includes a horizontally arranged worktable; characterized in that: The worktable is provided with an inlet traction roller group, multiple transmission roller groups and an outlet traction roller group in sequence along the forward direction of the film; the inlet traction roller group is connected to a first drive mechanism and the outlet traction roller group is connected to a second drive mechanism; the driving speed of the first drive mechanism is greater than the maximum speed of the film conveying.
2. The longitudinal stretching apparatus for film production as described in claim 1, characterized in that: A drooling machine is provided on one side of the longitudinal stretching machine. The drooling machine is equipped with a large rotating roller, a peeling roller and multiple guide rollers in sequence. The film is conveyed to the inlet traction roller group through the large rotating roller, the peeling roller and the multiple guide rollers.
3. The longitudinal stretching apparatus for thin film production as described in claim 2, characterized in that: The inlet traction roller assembly includes two inlet traction rollers that move up and down in a coordinated manner, one of which is connected to the output shaft of the first drive mechanism.
4. The longitudinal stretching apparatus for thin film production as described in claim 1, characterized in that: The outlet traction roller group includes three linked outlet traction rollers, one of which is connected to the output shaft of the second drive mechanism.
5. The longitudinal stretching apparatus for film production as described in claim 1, characterized in that: A transverse stretching machine is provided on one side of the longitudinal stretching machine, and a swing roller group is provided between the outlet traction roller group and the transverse stretching machine. The film is conveyed to the transverse stretching machine through the outlet traction roller group and the swing roller group.
6. The longitudinal stretching apparatus for thin film production as described in claim 5, characterized in that: The swing roller assembly includes a swing roller and an upper swing arm connected together, and the upper swing arm is connected to a third drive mechanism.
7. The longitudinal stretching apparatus for film production as described in claim 1, characterized in that: The multiple sets of drive rollers are evenly spaced.
8. The longitudinal stretching apparatus for film production as described in claim 1, characterized in that: The transmission roller assembly includes an upper transmission roller and a lower transmission roller, and both the upper transmission roller and the lower transmission roller are equipped with heating tubes.