Transverse stretching process for polyimide film

Abstract

The invention belongs to the technical field of polyimide film performance testing, and particularly relates to a transverse stretching process for a polyimide film, which comprises the following steps: step 1, film preparation; step 2, clamping the thin film; and step 3, transversely stretching and marking. According to the device, the transverse stretching mechanism is arranged, when a transverse stretching driving block gradually moves to the maximum position where transverse stretching can be achieved, a lower pressing plug is driven to extrude fluorescent liquid in a fluorescent liquid cylinder, the fluorescent liquid is extruded out of a fluorescent liquid spray head and smeared on the surface of a polyimide film, the fluorescent liquid can emit fluorescence under irradiation of ultraviolet light, and the polyimide film can be rapidly and rapidly stretched. The buffer spring can counteract tensile deformation of the polyimide film in the initial stage in the deformation process, fluorescent liquid is sprayed out only after the polyimide film is transversely stretched to the limiting position, on one hand, waste of the fluorescent liquid is avoided, and on the other hand, the fluorescent liquid is marked only when the film is completely stretched and reaches the preset deformation state.

Description

Technical Field

[0001] The invention belongs to the technical field of polyimide film performance testing, in particular to a transverse stretching process for a polyimide film. Background Art

[0002] Polyimide film, due to its exceptional physical properties such as high strength, high modulus, high-temperature resistance, and excellent electrical insulation, is widely used in electronics, aerospace, automotive, and other fields. These properties have earned it a prominent position in the field of high-performance materials. Polyimide film is produced by polycondensing pyromellitic dianhydride and diaminodiphenyl ether in a highly polar solvent, casting the resulting film, and then imidizing it. After preparation, the polyimide film is tested for its lateral ductility using stretching equipment.

[0003] After searching, the Chinese patent with the authorized patent announcement number CN118464673A discloses a transverse stretching device for polyimide film, comprising a support unit, a first clamping unit, a second clamping unit, a stretching unit and a locking unit. The present invention is provided with a locking unit, wherein when the second clamping unit is not clamped tightly, the film will move during the stretching process, thereby driving the locking roller on the surface to rotate, and the rocker on the locking roller rotates synchronously, pushing the strip plate slidably mounted on the surface to move, thereby driving the baffle and the partition to move to the side away from the first clamping unit, contacting the positioning rack and the positioning gear, achieving the purpose of locking the rotation of the card rod, and the card rod is inserted into the card slot at this time, so that the first clamping unit and the second clamping unit will not move relative to each other, and the transverse stretching test will automatically stop at this time, requiring the operator to re-lock the film, thereby improving the accuracy of the stretching test and being suitable for wide promotion and use.

[0004] However, after using this equipment to stretch the polyimide film transversely, the deformation of the polyimide film, especially the tiny cracks, necking and other features, are difficult to observe directly with the naked eye. Summary of the Invention

[0005] The object of the present invention is to provide a transverse stretching process for a polyimide film to solve the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A transverse stretching process for a polyimide film, comprising the following steps:

[0007] Step 1: Film preparation: Place the polyimide film to be tested for transverse tensile strength on a winding roller, guide it with a guide roller and keep it flat, and then cut it using the electric clamp 2 and the electric push rod to drive the cutting knife.

[0008] Step 2: Film clamping: The cut polyimide film is moved to the transverse stretching mechanism by the drive of the electric guide rail and the electric slider, and the two ends of the polyimide film are clamped by the electric clamp 1 respectively;

[0009] Step 3: Horizontal stretching and marking: Start the motor of the horizontal stretching mechanism to horizontally stretch the polyimide film through the transmission rod and the horizontal stretching drive block; at the same time, through the action of the linkage plate, linkage rod, linkage pressure plate, buffer spring and lower pressure plug, when the stretching reaches the maximum position, the fluorescent liquid cylinder is squeezed, and the fluorescent liquid is squeezed out of the fluorescent liquid nozzle and smeared on the surface of the polyimide film;

[0010] Among them, the transverse stretching mechanism is arranged behind the film cutting table, and the transverse stretching mechanism includes an L-shaped connecting arm, a transmission rod, a transverse pulling drive block, a fixed bracket, an electric clamp, a linkage rod, a linkage pressure plate, a buffer spring, a lower pressure plug and a fluorescent liquid cylinder.

[0011] Preferably, a lower pressure plug is provided inside the fluorescent liquid cylinder, the upper end of the lower pressure plug is fixedly connected to the limit rod, the upper end of the limit rod passes through the linkage pressure plate, a buffer spring is provided between the linkage pressure plate and the lower pressure plug, the buffer spring is sleeved on the outside of the limit rod, the left and right sides of the linkage pressure plate are rotatably connected with linkage rods, the two linkage rods are rotatably connected to the upper surfaces of the two linkage plates at one end away from the linkage pressure plate, the two linkage plates are fixedly connected to the outside of the two transverse pulling drive blocks, and a transmission rod is provided through the middle of the lower side of the two transverse pulling drive blocks. The left and right end surfaces of the transmission rod (402) are provided with a threaded structure, and the thread directions of the two threaded structures are opposite. The two transverse pulling drive blocks are threadedly connected to the transmission rod through the threaded structure. A connecting groove is provided above the two L-shaped connecting arms. The two transverse pulling drive blocks are slidably connected inside the corresponding connecting groove. The left and right sides of the two transverse pulling drive blocks are fixedly connected with fixed brackets. The front side of each fixed bracket is provided with an electric clamp. The upper end of the limit rod is fixedly connected with a limit plate, and the limit plate is provided above the linkage pressure plate.

[0012] Preferably, a motor is provided on the outer side of the right L-shaped connecting arm, and the output end of the motor is in transmission connection with the transmission rod.

[0013] Preferably, the interior of the fluorescent liquid cylinder is filled with fluorescent liquid, and a fluorescent liquid nozzle is provided at the lower end of the fluorescent liquid cylinder.

[0014] Preferably, a winding roller is provided on the front side of the film cutting table, and a polyimide film is wound around the outer side of the middle portion of the winding roller.

[0015] Preferably, a support frame is fixedly connected to the rear side of the upper end of the film cutting table, an electric push rod is provided in the middle of the upper surface of the support frame, the free end of the electric push rod is transmission-connected to a cutting knife, a cutting support plate is provided below the cutting knife, the cutting support plate is fixedly connected to the film cutting table, and a through groove is opened in the middle of the cutting support plate.

[0016] Preferably, three guide rollers are provided on the front side of the cutting support plate, and the three guide rollers are horizontally evenly distributed inside the upper end of the film cutting table in sequence, and the three guide rollers are rotatably connected to the film cutting table.

[0017] Preferably, the rear side of the fluorescent liquid cylinder is fixedly connected to a positioning rod, one end of the positioning rod away from the fluorescent liquid cylinder is fixedly connected to the side of the outer bracket, and the left and right ends of the lower end of the outer bracket are fixedly connected to the left and right sides of the tensile test bench.

[0018] Preferably, electric guide rails are fixedly connected to the left and right sides of the upper surface of the tensile testing platform, electric sliders are slidably connected to the upper surfaces of the two electric guide rails, a film-pulling plate is fixedly connected in the middle of the two electric sliders, and three electric clamps are provided on the front side of the film-pulling plate.

[0019] Preferably, a film-pulling plate is fixedly connected between the two electric sliders, and three electric clamps 2 are provided on the front side of the film-pulling plate.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention is provided with a transverse stretching mechanism, wherein the polyimide film to be tested is placed on a film cutting table, cut into appropriate sizes as needed, and moved to the transverse stretching mechanism of the stretching test table, where both ends of the polyimide film are clamped by two electric clamps respectively. When the motor is started, the transmission rod rotates, and the two transverse pulling drive blocks move in opposite directions due to the opposite thread directions, thereby transversely stretching the polyimide film. As the two transverse pulling drive blocks move, the outer end of the linkage rod connected to the upper end of the transverse pulling drive block by a linkage plate extends outward, and the inner end of the linkage rod swings toward a position close to the fluorescent liquid cylinder, thereby causing the linkage pressure plate to move downward and squeeze the buffer spring between the linkage pressure plate and the lower pressing plug. When the transverse pulling drive block gradually moves to the maximum position that can be stretched transversely, it is driven by the linkage plate and the linkage rod. The linked pressure plate moves downward, and the buffer spring no longer deforms, driving the lower pressure plug to squeeze the fluorescent liquid inside the fluorescent liquid cylinder, and then squeeze the fluorescent liquid out of the fluorescent liquid nozzle and apply it to the surface of the polyimide film. The fluorescent liquid will fluoresce under ultraviolet light, forming a sharp contrast with the color and material of the polyimide film itself. This high-contrast mark makes the deformation area, crack extension and necking phenomenon after stretching more clearly visible, facilitating naked eye observation and subsequent precise measurement. The buffer spring can offset the tensile deformation of the polyimide film in the initial stage during the deformation process. The fluorescent liquid will only be sprayed out after the polyimide film is stretched horizontally to the limit position. On the one hand, it avoids the waste of fluorescent liquid. On the other hand, the fluorescent liquid will only be marked when the film is fully stretched and reaches the predetermined deformation state, ensuring that the timing of fluorescent liquid application corresponds precisely to the stretched state of the film.

[0022] 2. The present invention is provided with a cutting knife. When the polyimide film needs to be cut, the polyimide film is pulled out from the winding roller into the electric clamp 2, and the rear edge of the polyimide film is clamped by the electric clamp 2. The electric push rod on the upper surface of the support frame is started, and the free end of the electric push rod pushes the cutting knife to move downward, so that the cutting knife cooperates with the cutting support plate below. The through groove opened in the middle of the cutting support plate allows the cutting knife to pass smoothly to achieve cutting of the polyimide film. Then the electric guide rail drives the electric slider to move toward the rear side with the electric clamp 2 to pull out the cut polyimide film, realizing the automation of film cutting, clamping and stretching preparation, and improving work efficiency and precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the main three-dimensional structure of the device used in the present invention;

[0024] Figure 2 It is a rear perspective structural diagram of the device used in the present invention;

[0025] Figure 3It is a schematic structural diagram of the front half of the device used in the present invention;

[0026] Figure 4 It is a schematic structural diagram of the second half of the device used in the present invention;

[0027] Figure 5 This is a bottom-up structural diagram of the rear half of the device used in the present invention;

[0028] Figure 6 This is a schematic structural diagram of the transverse stretching mechanism of the device used in the present invention;

[0029] Figure 7 The device used in the present invention Figure 5 Schematic diagram of the enlarged structure at A in the middle;

[0030] Figure 8 The device used in the present invention Figure 6 Schematic diagram of the enlarged structure at point B in the middle.

[0031] In the figure: 1. Tensile test bench; 2. Film cutting table; 3. Polyimide film; 4. Transverse stretching mechanism; 401. L-shaped connecting arm; 402. Transmission rod; 403. Threaded structure; 404. Transverse pulling drive block; 405. Fixed bracket; 406. Electric clamp 1; 407. Connecting groove; 408. Linkage plate; 409. Linkage rod; 410. Linkage pressure plate; 411. Limit rod; 412. Buffer spring; 413. Lower pressure plug; 414. Fluorescent liquid cylinder; 415. Fluorescent liquid nozzle; 416. Limit plate; 417. Motor; 5. External bracket; 6. Guide roller; 7. Support frame; 8. Electric push rod; 9. Cutting knife; 10. Electric guide rail; 11. Electric slider; 12. Film pulling plate; 13. Positioning rod; 14. Electric clamp 2; 15. Winding roller; 16. Cutting support plate. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] See also Figures 1-8 The present invention provides two technical solutions, specifically including the following embodiments:

[0034] Example 1:

[0035] A transverse stretching process for a polyimide film comprises the following steps:

[0036] Step 1: Film preparation: Place the polyimide film 3 to be subjected to the transverse tensile test on the winding roller 15, guide it and keep it flat through the guide roller 6, and cut it by driving the cutting knife 9 through the electric clamp 2 14 and the electric push rod 8;

[0037] Step 2: Film clamping: The cut polyimide film 3 is moved to the transverse stretching mechanism 4 by the drive of the electric guide rail 10 and the electric slider 11, and the two ends of the polyimide film 3 are clamped by the electric clamp 406 respectively;

[0038] Step 3, transverse stretching and marking: Start the motor 417 of the transverse stretching mechanism 4, and transversely stretch the polyimide film 3 through the transmission rod 402 and the transverse stretching drive block 404; at the same time, through the action of the linkage plate 408, the linkage rod 409, the linkage pressure plate 410, the buffer spring 412 and the lower pressing plug 413, when the stretching reaches the maximum position, the fluorescent liquid cylinder 414 is squeezed, and the fluorescent liquid is squeezed out from the fluorescent liquid nozzle 415 and applied to the surface of the polyimide film 3;

[0039] Among them, the transverse stretching mechanism 4 is arranged behind the film cutting table 2, and is used to realize the transverse stretching and surface fluorescent liquid marking of the polyimide film 3 during the preparation process of the polyimide film 3. The transverse stretching mechanism 4 includes an L-shaped connecting arm 401, a transmission rod 402, a transverse pulling drive block 404, a fixed bracket 405, an electric clamp 406, a linkage rod 409, a linkage pressure plate 410, a buffer spring 412, a lower pressure plug 413 and a fluorescent liquid cylinder 414. The interior of the fluorescent liquid cylinder 414 is provided with a lower pressing plug 413, the upper end of the lower pressing plug 413 is fixedly connected to the limiting rod 411, the upper end of the limiting rod 411 passes through the linkage pressure plate 410, and a buffer spring 412 is provided between the linkage pressure plate 410 and the lower pressing plug 413, and the buffer spring 412 is sleeved on the outer side of the limiting rod 411. The left and right sides of the linkage pressure plate 410 are rotatably connected with the linkage rod 409, and the two linkage rods 409 are rotatably connected to the upper surfaces of the two linkage plates 408 at one end away from the linkage pressure plate 410. The two linkage plates 408 are fixedly connected to the outer sides of the two horizontal pulling drive blocks 404, and a transmission rod 402 is provided in the middle of the lower side of the two horizontal pulling drive blocks 404. The surfaces of the left and right ends of the transmission rod 402 are provided with a threaded structure 403, and the thread directions of the two threaded structures 403 are opposite. The two horizontal pulling drive blocks 404 are threadedly connected to the transmission rod 402 through the threaded structure 403, and the two L-shaped A connecting groove 407 is provided above the connecting arm 401, and the two transverse pulling drive blocks 404 are slidably connected to the inside of the corresponding connecting groove 407. The left and right sides of the two transverse pulling drive blocks 404 are fixedly connected to a fixed bracket 405, and the front side of each fixed bracket 405 is provided with an electric clamp 406. The upper end of the limit rod 411 is fixedly connected to the limit plate 416, and the limit plate 416 is arranged above the linkage pressure plate 410. A motor 417 is provided on the outside of the right L-shaped connecting arm 401, and the output end of the motor 417 is transmission-connected to the transmission rod 402. The interior of the fluorescent liquid cylinder 414 is filled with fluorescent liquid, and the lower end of the fluorescent liquid cylinder 414 is provided with a fluorescent liquid nozzle 415. The rear side of the fluorescent liquid cylinder 414 is fixedly connected to the positioning rod 13, and the end of the positioning rod 13 away from the fluorescent liquid cylinder 414 is fixedly connected to the side of the outer bracket 5, and the left and right ends of the lower end of the outer bracket 5 are fixedly connected to the left and right sides of the tensile test bench 1.

[0040] During operation, the polyimide film 3 to be tested is placed on the film cutting table 2 and cut into appropriate sizes as needed. The cut polyimide film 3 is moved to the transverse stretching mechanism 4 of the tensile test table 1. The two ends of the polyimide film 3 are clamped by two electric clamps 406 respectively. When the motor 417 is started, the transmission rod 402 rotates, and the two transverse pulling drive blocks 404 move in opposite directions due to the opposite thread directions, thereby transversely stretching the polyimide film 3. As the two transverse pulling drive blocks 404 move, the outer end of the linkage rod 409 connected to the upper end of the transverse pulling drive block 404 by the linkage plate 408 extends outward, and the inner end of the linkage rod 409 swings to a position close to the fluorescent liquid cylinder 414, thereby causing the linkage pressure plate 410 to move downward and squeeze the buffer spring 412 between the linkage pressure plate 410 and the lower pressing plug 413. When the transverse pulling drive block 404 gradually moves to the maximum position that can be stretched transversely, the linkage plate 410 is pressed downward. The plate 408 and the linkage rod 409 drive the linkage pressure plate 410 to move downward, and the buffer spring 412 no longer deforms, driving the lower pressure plug 413 to squeeze the fluorescent liquid inside the fluorescent liquid cylinder 414, and squeeze the fluorescent liquid out of the fluorescent liquid nozzle 415 and apply it to the surface of the polyimide film 3. The fluorescent liquid will emit fluorescence under the irradiation of ultraviolet light, forming a sharp contrast with the color and material of the polyimide film 3 itself. This high-contrast mark makes the deformation area, crack extension and necking phenomenon after stretching more clearly visible, which is convenient for naked eye observation and subsequent accurate measurement. The buffer spring 412 can offset the tensile deformation of the polyimide film 3 in the initial stage during the deformation process. The fluorescent liquid will only be sprayed out after the polyimide film 3 is transversely stretched to the limit position. On the one hand, the waste of fluorescent liquid is avoided. On the other hand, the fluorescent liquid will only be marked when the film is fully stretched and reaches the predetermined deformation state, ensuring that the timing of fluorescent liquid application corresponds accurately to the stretched state of the film.

[0041] Example 2:

[0042] On the basis of embodiment 1, a winding roller 15 is provided on the front side of the film cutting table 2, and a polyimide film 3 is wound on the outer middle part of the winding roller 15. The rear side of the upper end of the film cutting table 2 is fixedly connected to a support frame 7, and an electric push rod 8 is provided in the middle of the upper surface of the support frame 7. The free end of the electric push rod 8 is transmission-connected to a cutting knife 9, and a cutting support plate 16 is provided below the cutting knife 9. The cutting support plate 16 is fixedly connected to the film cutting table 2, and a through groove is provided in the middle of the cutting support plate 16. Three guide rollers 6 are provided on the front side of the cutting support plate 16. The three guide rollers 6 are horizontally evenly distributed inside the upper end of the film cutting table 2 in turn, and the three guide rollers 6 are rotatably connected to the film cutting table 2. The function of the guide rollers 6 is to guide the direction of film movement and keep the polyimide film 3 flat when passing through to avoid wrinkles or distortion, thereby ensuring the accuracy of subsequent cutting and stretching. The left and right sides of the surface are fixedly connected with electric guide rails 10, and the upper surfaces of the two electric guide rails 10 are slidably connected with electric sliders 11. The middle of the two electric sliders 11 is fixedly connected with a film pulling plate 12, and the front side of the film pulling plate 12 is provided with three electric clamps 2 14. When the polyimide film 3 needs to be cut, the polyimide film 3 is pulled out from the winding roller 15 into the electric clamp 2 14, and the rear edge of the polyimide film 3 is clamped by the electric clamp 2 14. The electric push rod 8 on the upper surface of the support frame 7 is started, and the free end of the electric push rod 8 pushes the cutting knife 9 to move downward, so that the cutting knife 9 cooperates with the cutting support plate 16 below. The through groove opened in the middle of the cutting support plate 16 allows the cutting knife 9 to pass smoothly, thereby realizing the cutting of the polyimide film 3. Then the electric guide rail 10 drives the electric slider 11 to move backward with the electric clamp 2 14 to pull out the cut polyimide film 3.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the application should be included in the scope of protection of the present invention.

Claims

1. A transverse stretching process for a polyimide film, comprising the following steps: Step 1, film preparation: the polyimide film (3) to be subjected to the transverse tensile test is placed on the winding roller (15), guided and kept flat by the guide roller (6), and cut by the cutting knife (9) driven by the electric clamp 2 (14) and the electric push rod (8); Step 2: Film clamping: The cut polyimide film (3) is moved to the transverse stretching mechanism (4) by the driving of the electric guide rail (10) and the electric slider (11), and the two ends of the polyimide film (3) are clamped by the electric clamp 1 (406) respectively; Step 3, transverse stretching and marking: start the motor (417) of the transverse stretching mechanism (4), and transversely stretch the polyimide film (3) through the transmission rod (402) and the transverse stretching drive block (404); at the same time, through the action of the linkage plate (408), the linkage rod (409), the linkage pressure plate (410), the buffer spring (412) and the lower pressing plug (413), when the stretching reaches the maximum position, the fluorescent liquid cylinder (414) is squeezed, and the fluorescent liquid is squeezed out from the fluorescent liquid nozzle (415) and smeared on the surface of the polyimide film (3); The transverse stretching mechanism (4) is arranged behind the film cutting table (2), and comprises an L-shaped connecting arm (401), a transmission rod (402), a transverse pulling drive block (404), a fixing bracket (405), an electric clamp (406), a linkage rod (409), a linkage pressure plate (410), a buffer spring (412), a lower pressing plug (413) and a fluorescent liquid cylinder (414).

2. The transverse stretching process for a polyimide film according to claim 1, characterized in that: A lower pressing plug (413) is provided inside the fluorescent liquid cylinder (414), and the upper end of the lower pressing plug (413) is fixedly connected to a limiting rod (411), and the upper end of the limiting rod (411) passes through the linkage pressure plate (410), and a buffer spring (412) is provided between the linkage pressure plate (410) and the lower pressing plug (413), and the buffer spring (412) is sleeved on the outer side of the limiting rod (411), and the left and right sides of the linkage pressure plate (410) are both rotatably connected to the linkage rods (409), and the ends of the two linkage rods (409) away from the linkage pressure plate (410) are respectively rotatably connected to the upper surfaces of the two linkage plates (408), and the two linkage plates (408) are fixedly connected to the outer sides of the two transverse pulling drive blocks (404), and a transmission rod is provided through the middle of the lower side of the two transverse pulling drive blocks (404). (402), the left and right end surfaces of the transmission rod (402) are provided with threaded structures (403), and the thread directions of the two threaded structures (403) are opposite, the two transverse pulling drive blocks (404) are threadedly connected to the transmission rod (402) through the threaded structure (403), the tops of the two L-shaped connecting arms (401) are provided with connecting grooves (407), the two transverse pulling drive blocks (404) are slidably connected inside the corresponding connecting grooves (407), the left and right sides of the two transverse pulling drive blocks (404) are fixedly connected with fixed brackets (405), and the front side of each fixed bracket (405) is provided with an electric clamp (406), the upper end of the limit rod (411) is fixedly connected with a limit plate (416), and the limit plate (416) is provided above the linkage pressure plate (410).

3. The transverse stretching process for a polyimide film according to claim 1, wherein: A motor (417) is provided on the outer side of the right L-shaped connecting arm (401), and the output end of the motor (417) is transmission-connected to the transmission rod (402).

4. The transverse stretching process for a polyimide film according to claim 1, wherein: The interior of the fluorescent liquid cylinder (414) is filled with fluorescent liquid, and the lower end of the fluorescent liquid cylinder (414) is provided with a fluorescent liquid nozzle (415).

5. The transverse stretching process for a polyimide film according to claim 1, characterized in that: A winding roller (15) is provided on the front side of the film cutting table (2), and a polyimide film (3) is wound around the outer side of the middle portion of the winding roller (15).

6. The transverse stretching process for a polyimide film according to claim 1, characterized in that: The upper rear side of the film cutting table (2) is fixedly connected to a support frame (7), an electric push rod (8) is provided in the middle of the upper surface of the support frame (7), the free end of the electric push rod (8) is transmission-connected to a cutting knife (9), a cutting support plate (16) is provided below the cutting knife (9), the cutting support plate (16) is fixedly connected to the film cutting table (2), and a through groove is provided in the middle of the cutting support plate (16).

7. The transverse stretching process for a polyimide film according to claim 6, characterized in that: Three guide rollers (6) are provided on the front side of the cutting support plate (16), and the three guide rollers (6) are horizontally evenly distributed inside the upper end of the film cutting table (2) in sequence, and the three guide rollers (6) are rotatably connected to the film cutting table (2).

8. The transverse stretching process for a polyimide film according to claim 1, characterized in that: A positioning rod (13) is fixedly connected to the rear side of the fluorescent liquid cylinder (414), and one end of the positioning rod (13) away from the fluorescent liquid cylinder (414) is fixedly connected to the side of the outer bracket (5), and the left and right ends of the lower end of the outer bracket (5) are fixedly connected to the left and right sides of the tensile test bench (1).

9. The transverse stretching process for a polyimide film according to claim 8, characterized in that: The left and right sides of the upper surface of the tensile test bench (1) are fixedly connected to electric guide rails (10), the upper surfaces of the two electric guide rails (10) are slidably connected to electric sliders (11), the middle of the two electric sliders (11) is fixedly connected to a film-drawing plate (12), and the front side of the film-drawing plate (12) is provided with three electric clamps (14).

10. The transverse stretching process for a polyimide film according to claim 9, characterized in that: A film-pulling plate (12) is fixedly connected between the two electric sliders (11), and three electric clamps (14) are arranged on the front side of the film-pulling plate (12).

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