A polyimide film casting machine

Abstract

The application relates to the field of film casting technology, in particular to a polyimide film casting machine; the machine box is internally provided with casting rollers driven by first motors; two casting rollers are left-right transmissionally connected with steel belts; the bottom and the top of the machine box are provided with a plurality of drying interfaces; a demolding roller is rotationally connected to the lower position of the right port of the machine box; a casting die head is arranged on the right position of the upper surface of the steel belt on the inner side of the machine box; after the casting die head covers the material on the outer surface of the steel belt, the film semi-product is formed through drying and is guided out through the demolding roller; a plurality of spacing pieces are arranged on the outer surface of the steel belt along the width direction in the transmission process, so that the liquid film on the steel belt is separated into a plurality of independent liquid films, the film semi-product after the casting forming meets the target width, the subsequent slitting process is omitted, the production efficiency is improved, and the film product defects caused by slitting are avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of film casting, in particular to a polyimide film casting machine. BACKGROUND

[0002] Polyimide film is a high-performance polymer film material made of polyimide resin as raw material, which has excellent high-temperature resistance, long-term use temperature up to -269℃ to 280℃ or above, and also has excellent mechanical strength, good insulation, chemical corrosion resistance and radiation resistance, and has certain flexibility and dimensional stability. It is widely used in high-end fields such as electronics, aerospace, new energy, flexible display, etc., and is one of the organic polymer films with the best comprehensive performance, known as "golden film".

[0003] The production process of polyimide film starts from amine solution filtration, acetylamide is put into the amine solution kettle, and after the diamine is dissolved and filtered into the reaction kettle, then in the resin synthesis process, dianhydride is added to the diamine solution in batches to form polyamide acid resin solution (PAA); then the PAA solution is filtered once and enters the defoaming kettle for defoaming, and then filtered again; then enters the flow line process, the resin is coated on the steel belt from the flow line die through the metering pump to form a liquid film, dried through the drying channel to volatilize the solvent to form a solid PAA film and peel off; the peeled film enters the stretching / imidization process, and is imidized at high temperature while being stretched in two directions to form a polyimide film; the solvent waste gas volatilized from the flow line and imidization process is treated by a condenser and two-stage molecular sieve, and is discharged together with the waste gas treated by a two-stage molecular sieve from the stretching process through the exhaust cylinder; finally, the film is wound, inspected and packaged.

[0004] The casting machine is the equipment used in the casting process. At the casting die, the resin is uniformly coated on the steel belt to form a single film with a relatively wide width. After a series of processes such as drying and stretching, the final wound film usually has a relatively wide width. In actual application, the formed film needs to be slitted according to specific use requirements to obtain products with different widths. The slitting link may be carried out at the end of the production process or in the subsequent processing link.

[0005] However, this forming and then slitting method has obvious limitations: on the one hand, it adds an additional production process, prolongs the overall processing cycle, reduces production efficiency, and also increases equipment investment and energy consumption costs; on the other hand, uneven edges often occur during the slitting process, especially since the polyimide film itself has high mechanical strength, and if the force is uneven or the cutting tool is not precise enough during slitting, burrs and warping may occur on the edges, affecting product quality and subsequent performance such as adhesion and sealing performance; in addition, improper tension control during slitting may damage the internal structure of the film, compromising its original dimensional stability and mechanical properties, and thus affecting the application reliability in high-end fields. As the market's demand for the quality and production efficiency of polyimide films continues to increase, the drawbacks of traditional slitting processes are becoming increasingly prominent, and there is an urgent need to improve existing production methods to address these issues. SUMMARY

[0006] To make up for the shortcomings of the prior art, the present application provides a polyimide film casting machine. The present application is characterized in that a plurality of barriers are arranged on the outer surface of the steel belt in the transmission process along the width direction, so that the liquid film on the steel belt is separated into a plurality of independent liquid films, and the film semi-finished product after casting forming meets the target width, thereby omitting the subsequent slitting process, improving production efficiency, and avoiding film product defects caused by slitting.

[0007] The technical scheme adopted by the present application to solve its technical problems is as follows: the polyimide film casting machine comprises a machine box and a casting roller driven by a first motor inside the machine box; two casting rollers are connected to a steel belt through left and right transmission; a plurality of drying interfaces are arranged on the bottom and top of the machine box; a demolding roller is rotatably connected to the lower position of the right port of the machine box; a casting die head is arranged on the right side of the upper surface of the steel belt inside the machine box; after the material is coated on the outer surface of the steel belt and dried, a film semi-finished product is formed and guided out by the demolding roller; a barrier is arranged on the outer surface of the steel belt; the barrier is in sealing contact with the outer surface of the steel belt; the thickness of the barrier is greater than the thickness of the film semi-finished product; each barrier starts from the right side of the upper surface of the steel belt, passes through the left end of the steel belt counterclockwise, and reaches the right side of the lower surface of the steel belt; a plurality of barriers are distributed at corresponding positions in the front and back directions.

[0008] Preferably, the barrier is in the shape of a conveyor belt; a U-shaped bracket is arranged inside the barrier; the opening of the U-shaped bracket faces to the right; the U-shaped bracket is located inside the barrier; a plurality of dumbbell holes are arranged on the U-shaped bracket along the transmission direction; the dumbbell holes pass through the U-shaped bracket from front to back; a dumbbell wheel is rotatably connected in the dumbbell hole; the barrier is transmissionally connected to the outside of the dumbbell wheel.

[0009] Preferably, the u-shaped frame is provided with adjusting grooves through the front and back; the adjusting grooves are slidably connected with adjusting plates; the adjusting plates are fixedly connected to the front and back inner walls of the case; and the case is provided with an operation window on the top.

[0010] Preferably, the u-shaped frame is provided with adjusting holes through the front and back; all the adjusting holes pass through the adjusting rod from front to back; the adjusting rod is rotatably connected to the case; the rear end of the adjusting rod extends to the outside of the case; a plurality of arc-shaped strips are fixedly connected to the outer wall of the adjusting rod along the length direction; the thickness of the arc-shaped strips decreases in the clockwise direction; the inner wall of the adjusting hole is fixedly connected with a clamping block; and the thickness of the clamping block decreases in the counterclockwise direction.

[0011] Preferably, the front and back inner walls of the case are rotatably connected with a synchronous rod; the outer wall of the synchronous rod is provided with a strip-shaped synchronous groove along the axial direction; the synchronous groove is slidably connected with a synchronous block; a group of corresponding dumbbell-shaped wheels from front to back are provided with a synchronous hole; the synchronous rod passes through the synchronous hole; the synchronous block is fixedly connected to the inner wall of the synchronous hole; the rear side of the case is fixedly connected with the outer shell of a second motor; and the output shaft of the second motor is fixedly connected to the rear end of the synchronous rod.

[0012] Preferably, the position of the blocking piece close to the casting die is the starting end, and the position of the blocking piece close to the stripping roller is the cutoff end; the starting end of the blocking piece is tilted away from the steel belt; and the tilt height of the starting end of the blocking piece is greater than the liquid film thickness.

[0013] Preferably, the cutoff end of the blocking piece is tilted away from the steel belt; and the tilt height of the cutoff end of the blocking piece is greater than the thickness of the film semi-finished product.

[0014] Preferably, the left side of the casting die is fixedly connected with a scraping seat; the scraping seat is provided with a scraping groove; the scraping groove is slidably connected with a scraping plate; and the scraping groove is threadedly connected with a first bolt outwardly.

[0015] Preferably, the right side of the casting die is fixedly connected with an adjusting seat; one side of the adjusting seat facing the casting die is provided with an adjusting groove; the adjusting groove is in communication with the inner side of the opening of the casting die; a plurality of adjusting blocks sliding left and right are arranged on the inner side of the adjusting groove along the front and back directions; the right side of the adjusting block is rotatably connected with a second bolt; and the second bolt is threadedly connected with the adjusting seat.

[0016] Preferably, the inner side of the steel belt is supported with a support seat; and the support seat is fixedly connected to the inner wall of the case.

[0017] The beneficial effects of the present application are as follows:

[0018] 1. The present application is characterized in that a plurality of barriers are arranged along the width direction of the outer surface of the steel belt during transmission, so that the liquid film on the steel belt is separated into a plurality of independent liquid films, and the film semi-finished product after casting meets the target width, and the subsequent slitting process is omitted, the production efficiency is improved, and the film product defects caused by slitting are avoided.

[0019] 2. In the present application, the barrier can be driven with the steel belt, so that the inner half of the barrier and the outer surface of the steel belt are relatively stationary, and the inner half of the barrier is relatively stationary with the separated independent liquid film, so as to avoid the problem of uneven liquid film edge caused by displacement of the barrier during liquid film drying and forming, thereby improving the edge integrity of the film semi-finished product and improving the quality of the film semi-finished product.

[0020] 3. In the present application, the operator can observe the position of the barrier inside the machine box through the operation window, and adjust the width of the film semi-finished product by adjusting the position of the barrier in the width direction of the steel belt, thereby better meeting the production needs of the film product. BRIEF DESCRIPTION OF DRAWINGS

[0021] The present application will be further described below in conjunction with the drawings and embodiments.

[0022] Figure 1 is a perspective view of the present application;

[0023] Figure 2 is a position diagram of the first motor and the second motor of the present application;

[0024] Figure 3 is a perspective view of the present application;

[0025] Figure 4 is Figure 3 is an enlarged view of A in the present application;

[0026] Figure 5 is Figure 3 is an enlarged view of B in the present application;

[0027] Figure 6 is Figure 3 is an enlarged view of C in the present application;

[0028] Figure 7 is a plan view of the present application;

[0029] Figure 8 is a structure diagram of the casting die of the present application;

[0030] Figure 9 is an internal structure diagram of the machine box of the present application;

[0031] Figure 10 is a perspective view of the barrier and the u-shaped frame in the present application;

[0032] Figure 11 yes Figure 10 Enlarged view of point D in the middle;

[0033] Figure 12 This is a perspective view of the adjusting rod in this invention;

[0034] Figure 13 yes Figure 10 Exploded view;

[0035] Figure 14 yes Figure 13 Enlarged view of point E in the middle.

[0036] In the diagram: 1. Chassis; 11. First motor; 12. Casting roller; 13. Steel strip; 14. Drying interface; 15. Demolding roller; 16. Operation window; 17. Second motor; 18. Support base; 2. Casting die head; 3. Partition; 4. U-shaped frame; 41. Dumbbell hole; 42. Dumbbell wheel; 43. Adjustment groove; 44. Adjustment plate; 45. Adjustment hole; 46. Adjustment bar; 47. Arc strip; 48. Locking block; 49. Synchronization hole; 5. Synchronization rod; 51. Synchronization groove; 52. Synchronization block; 6. Scraper seat; 61. Scraper groove; 62. Scraper; 63. First bolt; 7. Adjustment seat; 71. Adjustment groove; 72. Adjustment block; 73. Second bolt. Detailed Implementation

[0037] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0038] like Figures 1 to 14 As shown, the present invention includes the following embodiments:

[0039] Example 1: A polyimide film casting machine includes a housing 1 and casting rollers 12 driven by a first motor 11 inside the housing 1; two casting rollers 12 are connected to a steel belt 13 via left and right transmission; multiple drying ports 14 are provided at the bottom and top of the housing 1; a release roller 15 is rotatably connected to the lower right port of the housing 1; a casting die 2 is provided inside the housing 1 and located on the right side of the upper surface of the steel belt 13; the casting die 2 covers the material onto the outer surface of the steel belt 13, and after drying, forms a semi-finished film, which is then discharged through the release roller 15; a partition 3 is provided on the outer surface of the steel belt 13; the partition 3 is in sealed contact with the outer surface of the steel belt 13; the thickness of the partition 3 is greater than the thickness of the semi-finished film; a single partition 3 starts from the right side of the upper surface of the steel belt 13, rotates counterclockwise around the left end of the steel belt 13, and ends at the right side of the lower surface of the steel belt 13; multiple partitions 3 are distributed in corresponding positions in the front-back direction.

[0040] First, the amine solution is filtered, and the acetamide is put into the amine solution tank, and after the diamine is dissolved, it is filtered into the reaction kettle; then in the resin synthesis process, the dianhydride is added to the diamine solution in batches to form a polyamide acid resin solution (PAA); then the PAA solution is filtered once and enters the defoaming kettle for defoaming, and then filtered again; then it can enter the flow casting process, the resin is coated on the steel belt 13 from the flow casting die 2 through the metering pump to form a liquid film, the first motor 11 drives the flow casting roller 12 to rotate, thereby driving the steel belt 13 to transmit power, the first motor 11 is located at the rear side of the machine box 1, and the first motor 11 is fixedly connected with the machine box 1, the output shaft of the first motor 11 is connected with one of the flow casting rollers 12, and the inner wall of the steel belt 13 and the flow casting roller 12 can be treated to prevent slipping, the upper half of the steel belt 13 moves from right to left, and the lower half of the steel belt 13 moves from left to right, the upper surface of the steel belt 13 drives the liquid film to move left and pass through a plurality of barriers 3, the thickness of the barrier 3 is much greater than the thickness of the liquid film, so the liquid film cannot pass through the barrier 3, and two barriers 3 are in contact with the front and rear inner walls of the machine box 1 respectively, the width of the steel belt 13 is adapted to the distance between the front and rear inner walls of the machine box 1, and a plurality of barriers 3 distributed in front of and behind each other form a plurality of flow casting channels, the width of the flow casting channel is adapted to the width of the formed film product, and the liquid film is separated and blocked by the barriers 3 and enters the plurality of flow casting channels, the whole liquid film is separated into a plurality of liquid films with required width by the barriers 3, and the steel belt 13 drives the liquid film to move along the flow casting channel, a plurality of drying interfaces 14 are arranged at the top and bottom of the machine box 1, the drying interfaces 14 are connected with the drying pipeline outside, and the hot air in the machine box 1 flows in two sections, the first section enters from the right position at the bottom of the machine box 1, flows out along the left position at the top of the machine box 1 inside the machine box 1, and the second section enters from the left position at the top of the machine box 1, flows out along the right position at the top of the machine box 1 inside the machine box 1, so that the inside of the machine box 1 can be fully contacted with the liquid film on the steel belt 13 through the hot air to realize drying of the liquid film, in the drying process, the barriers 3 separate the plurality of liquid films in the width direction, so that the plurality of liquid films are not connected together again, and the plurality of liquid films are disconnected in the width direction, the solvent of the liquid film after drying is volatilized to form a solid film, that is, a film semi-product, the whole drying process is separated by the barriers 3, and after the film semi-product is formed, it is separated from the barriers 3 and guided to the demolding roller 15 along with the transmission of the steel belt 13, the film semi-product gradually separates from the steel belt 13 and is guided by the demolding roller 15 to move out from the right port of the machine box 1 to enter the next process, the film semi-product enters the stretching / imidization process, is high-temperature imidized and simultaneously stretched in two directions to form a polyimide film; the solvent waste gas volatilized in the flow casting and imidization processes is treated by a condenser and two-stage molecular sieve, and is discharged together with the waste gas treated by two-stage molecular sieve in the stretching process through an exhaust cylinder; finally, the film product is wound, inspected and packaged;

[0041] The present application is characterized in that a plurality of barriers 3 are arranged along the width direction on the outer surface of the steel belt 13 during transmission, so that the plurality of barriers 3 can separate the liquid film on the steel belt 13 into a plurality of independent liquid films, and then the film semi-finished product after flow casting meets the target width, the subsequent slitting process is omitted, the production efficiency is improved, and the film finished product defects caused by slitting are avoided.

[0042] In embodiment 2, the barrier 3 is in the shape of a conveyor belt, the inner side of the barrier 3 is provided with a U-shaped frame 4, the opening of the U-shaped frame 4 faces right, the U-shaped frame 4 is located on the inner side of the barrier 3, a plurality of dumbbell holes 41 are arranged on the U-shaped frame 4 along the transmission direction, the dumbbell holes 41 penetrate through the U-shaped frame 4 front and back, the dumbbell holes 41 are rotationally connected with a dumbbell wheel 42, and the barrier 3 is transmissionally connected outside the dumbbell wheel 42.

[0043] The barrier 3 in the shape of a conveyor belt is divided into an inner half part close to the steel belt 13 and an outer half part away from the steel belt 13, the inner half part of the barrier 3 is in contact with and sealed to the outer surface of the steel belt 13, and is transmissionally connected with the outer surface of the steel belt 13, the outer surface of the steel belt 13 drives the liquid film to pass through the barrier 3, the inner half part of the barrier 3 has sufficient thickness to separate the liquid film into a plurality of independent liquid films, the independent liquid films move along the flow channel with the transmission of the steel belt 13, the barrier 3 is transmissionally connected outside the U-shaped frame 4 through the dumbbell wheel 42, the barrier 3 has large friction with the outer surface of the steel belt 13, so the barrier 3 can be transmissionally connected with the steel belt 13, and thus the inner half part of the barrier 3 and the outer surface of the steel belt 13 are relatively static, so the inner half part of the barrier 3 is relatively static with the separated independent liquid films, which avoids the problem that the barrier 3 is displaced during the drying and forming of the liquid film to cause uneven edges of the liquid film, thereby improving the edge integrity of the film semi-finished product and the quality of the film semi-finished product; the position of the barrier 3 close to the flow die 2 is the starting end, the position of the barrier 3 close to the demolding roller 15 is the end point, the inner half part of the barrier 3 is separated from the film semi-finished product at the end point, that is, the separation of the inner half part of the barrier 3 from the film semi-finished product is performed after drying, thereby improving the quality of the film semi-finished product; the barrier 3 is transmissionally connected outside the dumbbell wheel 42, and anti-skid structures such as protrusions can be arranged on the inner surface of the barrier 3 and the outer surface of the dumbbell wheel 42 to prevent slipping and improve the transmission stability of the barrier 3.

[0044] In embodiment 3, the U-shaped frame 4 is provided with an adjusting groove 43 penetrating through front and back, an adjusting plate 44 is slidably connected in the adjusting groove 43, the adjusting plate 44 is fixedly connected to the front and back inner walls of the cabinet 1, and the cabinet 1 is provided with an operation window 16 on the top.

[0045] In the embodiment, the u-shaped frame 4 is provided with adjusting holes 45 in front and back; all the adjusting holes 45 pass through the adjusting rod 46 in front and back; the adjusting rod 46 is rotationally connected with the case 1; the rear end of the adjusting rod 46 extends to the outside of the case 1; the outer wall of the adjusting rod 46 is fixedly connected with a plurality of arc-shaped strips 47 along the length direction; the thickness of the arc-shaped strips 47 decreases in the clockwise direction; the inner wall of the adjusting hole 45 is fixedly connected with a clamping block 48; the thickness of the clamping block 48 decreases in the counterclockwise direction.

[0046] After the operation window 16 is opened, the operator can observe the position of the baffle 3 inside the case 1 through the operation window 16, and adjust the width of the film semi-finished product by adjusting the position of the baffle 3 in the width direction of the steel belt 13, so as to better meet the production requirements of the film finished product; in order to avoid the displacement of the baffle 3 during the flow forming process, the adjusting holes 45 are opened on the u-shaped frame 4, and the clamping block 48 on the inner side of the adjusting hole 45 is clamped by the arc-shaped strip 47; when it is necessary to adjust the baffle 3 in the width direction of the steel belt 13, the rear end of the adjusting rod 46 is first rotated; after the adjusting rod 46 is rotated counterclockwise, the plurality of arc-shaped strips 47 are counterclockwise rotated, the plurality of arc-shaped strips 47 are separated from the contact with the clamping block 48, the clamping block 48 is relatively moved out from the gap position between the adjacent arc-shaped strips 47, so that the clamping block 48 is unlocked, that is, the clamping block 48 can move with the baffle 3; after the position of the baffle 3 is adjusted, the adjusting rod 46 is rotated clockwise again, the plurality of arc-shaped strips 47 on the outer wall are clockwise rotated, so that the clamping block 48 re-enters the arc-shaped strip 47, and the clamping block 48 is locked, so that the plurality of u-shaped frames 4 together with the baffle 3 are locked in the front and back directions, and the stability of the baffle 3 in the film flow forming process is improved.

[0047] In the embodiment, the case 1 is rotationally connected with the synchronous rod 5 in front and back; the outer wall of the synchronous rod 5 is provided with a strip-shaped synchronous groove 51 along the axial direction; the synchronous block 52 is slidably connected in the synchronous groove 51; a group of corresponding dumbbell-shaped wheels 42 in front and back are provided with a synchronous hole 49; the synchronous rod 5 passes through the synchronous hole 49; the synchronous block 52 is fixedly connected on the inner wall of the synchronous hole 49; the outer shell of the second motor 17 is fixedly connected on the rear side of the case 1; the output shaft of the second motor 17 is fixedly connected with the rear end of the synchronous rod 5.

[0048] In order to avoid the slip between the baffle 3 and the steel belt 13, and the relative displacement of the liquid film on the baffle 3 and the steel belt 13, the baffle 3 is driven by the second motor 17, and the steel belt 13 is driven by the first motor 11. The second motor 17 drives the synchronous rod 5 to rotate during operation. The synchronous rod 5 drives the synchronous block 52 in the synchronous groove 51 to rotate during rotation. The synchronous block 52 rotates with the synchronous rod 5 under the limitation of the synchronous groove 51. The synchronous block 52 drives the dumbbell-shaped wheel 42 to rotate during rotation. The contact position between the outer wall of the dumbbell-shaped wheel 42 and the baffle 3 can be provided with an anti-slip structure to avoid slipping. The dumbbell-shaped wheel 42 drives the baffle 3 to rotate during rotation. The transmission speed of the second motor 17 driving the steel belt 13 is consistent with the transmission speed of the baffle 3, so as to ensure that the outer surface of the steel belt 13 and the inner part of the baffle 3 will not produce relative displacement, and the stability during the drying process of the liquid film is ensured. When it is necessary to adjust the position of the baffle 3 in the front and rear directions, the u-shaped frame 4 drives the dumbbell-shaped wheel 42 to move forward or backward, and the dumbbell-shaped wheel 42 drives the synchronous block 52 to move forward or backward in the synchronous groove 51. After the dumbbell-shaped wheel 42 and the u-shaped frame 4 complete the movement, the corresponding group of dumbbell-shaped wheels 42 can still rotate synchronously in the front and rear directions, so that the front and rear baffles 3 can be driven at the same speed, avoiding the uneven edge caused by the different transmission speeds of the front and rear baffles 3, and further improving the quality of the film semi-finished product.

[0049] In embodiment 5, the position of the baffle 3 close to the casting die 2 is the starting end, and the position of the baffle 3 close to the stripping roller 15 is the cut-off end. The starting end of the baffle 3 is tilted towards the direction away from the steel belt 13. The tilt height of the starting end of the baffle 3 is greater than the thickness of the liquid film.

[0050] In this embodiment, the cut-off end of the baffle 3 is tilted towards the direction away from the steel belt 13. The tilt height of the cut-off end of the baffle 3 is greater than the thickness of the film semi-finished product.

[0051] Since the starting end of the barrier 3 is tilted away from the steel belt 13, when the starting end of the barrier 3 contacts the liquid film, the liquid film is gradually separated by the barrier 3, thereby avoiding the problems of splashing of the liquid film, edge folding of the liquid film, and the like caused by rapid separation of the liquid film from the barrier 3. After the liquid film is gradually separated, the excess part of the separated liquid film edge slowly flows to other positions, so that the liquid film is more flat and the edge is more flat. In addition, the tilted starting end of the barrier 3 increases the contact area with the liquid film, so that the liquid film is more smoothly driven into the flow channel by friction, reduces the accumulation of the liquid film at the starting end of the barrier 3, and improves the flow smoothness of the liquid film. The tilting design of the stopping end of the barrier 3 solves the edge damage problem when the film semi-finished product is separated from the barrier 3. After the liquid film is dried to form a film semi-finished product, the stopping end of the barrier 3 is separated from the film semi-finished product without transition, which may cause the film semi-finished product to be torn, thereby increasing the risk of forming a film semi-finished product with a rough edge. By tilting the stopping end of the barrier 3, the film semi-finished product is slowly separated from the barrier 3 along the inclined surface, the contact area gradually decreases during the transmission process, the friction force is uniformly released, the edge damage is effectively avoided, and the quality of the film semi-finished product is ensured.

[0052] In example 6, the left side of the flow die 2 is fixedly connected with a scraping seat 6; the scraping seat 6 is provided with a scraping groove 61; the scraping groove 61 is slidably connected with a scraping plate 62; and the scraping groove 61 is outwardly threadedly connected with a first bolt 63.

[0053] The first bolt 63 is twisted away from the scraping plate 62 to unlock the scraping plate 62. By controlling the position of the scraping plate 62 in the vertical direction of the scraping groove 61, the gap between the scraping plate 62 and the outer surface of the steel belt 13, that is, the thickness of the liquid film, is changed to adjust the thickness. After the position of the scraping plate 62 is adjusted, the first bolt 63 is tightened against the outer wall of the scraping plate 62 to lock the scraping plate 62.

[0054] In example 7, the right side of the flow die 2 is fixedly connected with an adjusting seat 7; one side of the adjusting seat 7 facing the flow die 2 is provided with an adjusting groove 71; the adjusting groove 71 is in communication with the inner side of the opening of the flow die 2; a plurality of adjusting blocks 72 slidably left and right are arranged in the adjusting groove 71 along the front and back directions; the right side of the adjusting block 72 is rotatably connected with a second bolt 73; and the second bolt 73 is threadedly connected with the adjusting seat 7.

[0055] Tightening the second bolt 73 can drive the adjusting block to move away from or near the bottom of the adjusting groove 43 within the adjusting groove 43. The extent to which the adjusting block extends into the opening of the casting die 2 directly affects the output thickness of the casting die 2. In the transmission direction, the adjusting block corresponding to the partition 3 is controlled to fully extend into the opening of the casting die 2. In this way, the liquid film flowing out of the casting die 2 corresponds to the position of the casting channel, reducing the difficulty for the partition 3 to separate the liquid film and preventing the output of the casting die 2 from affecting the liquid film thickness more.

[0056] Example 8: The inner side of the steel strip 13 is supported by a support base 18; the support base 18 is fixedly connected to the inner wall of the chassis 1.

[0057] The support seat 18 can support the inner side of the steel strip 13 to ensure the flatness of the steel strip 13. A rolling column can be set at the contact position between the support seat 18 and the steel strip 13 to reduce friction.

[0058] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description only, and are not intended to 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 limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and should not be construed as indicating or implying relative importance.

[0059] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A polyimide film casting machine, comprising a machine box and a casting roller driven by a first motor inside the machine box; two steel belts are connected to the casting roller through transmission; a plurality of drying interfaces are arranged on the bottom and top of the machine box; a release roller is rotatably connected to the lower part of the right end of the machine box; a casting die is arranged on the right side of the upper surface of the steel belt inside the machine box; after the material is coated on the outer surface of the steel belt by the casting die, the film semi-product is formed after drying, and is guided out by the release roller; characterized in that: The outer surface of the steel belt is provided with a barrier; the barrier is in sealing contact with the outer surface of the steel belt; the thickness of the barrier is greater than the thickness of the film semi-finished product; a single barrier starts from the upper surface of the steel belt on the right, passes the left end of the steel belt counterclockwise, and reaches the lower surface of the steel belt on the right; a plurality of barriers are distributed in corresponding positions in the front and back directions. ​ The barrier is in the shape of a conveyor belt; the inner side of the barrier is provided with a u-shaped bracket; the opening of the u-shaped bracket faces right; the u-shaped bracket is located on the inner side of the barrier; a plurality of dumbbell holes are provided on the u-shaped bracket along the transmission direction; the dumbbell holes pass through the u-shaped bracket in front and back; the dumbbell holes are rotationally connected with dumbbell wheels; the barrier is transmissionally connected outside the dumbbell wheels.

2. The polyimide film casting machine according to claim 1, characterized by: The u-shaped bracket is provided with an adjusting groove passing through in front and back; the adjusting groove is slidably connected with an adjusting plate; the adjusting plate is fixedly connected to the front and back inner walls of the case; the top of the case is provided with an operation window.

3. The polyimide film casting machine according to claim 2, characterized by: The u-shaped bracket is provided with an adjusting hole passing through in front and back; all the adjusting holes pass through an adjusting rod in front and back; the adjusting rod is rotationally connected with the case; the rear end of the adjusting rod extends to the outside of the case; a plurality of arc-shaped strips are fixedly connected to the outer wall of the adjusting rod along the length direction; the thickness of the arc-shaped strips decreases in the clockwise direction; the inner wall of the adjusting hole is fixedly connected with a clamping block; the thickness of the clamping block decreases in the counterclockwise direction.

4. The polyimide film casting machine according to claim 2, wherein: The front and back inner walls of the case are rotationally connected with a synchronization rod; the outer wall of the synchronization rod is provided with a strip-shaped synchronization groove along the axial direction; the synchronization groove is slidably connected with a synchronization block; a group of dumbbell wheels corresponding in front and back are provided with a synchronization hole; the synchronization rod passes through the synchronization hole; the synchronization block is fixedly connected to the inner wall of the synchronization hole. The rear side of the case is fixedly connected with the housing of the second motor; the output shaft of the second motor is fixedly connected with the rear end of the synchronization rod.

5. The polyimide film casting machine according to claim 1, wherein: The position of the barrier close to the casting die is the starting end, and the position of the barrier close to the demolding roller is the ending end; the starting end of the barrier is tilted upward away from the steel belt; the tilt height of the starting end of the barrier is greater than the thickness of the liquid film.

6. A polyimide film casting machine according to claim 5, wherein: The ending end of the barrier is tilted upward away from the steel belt; the tilt height of the ending end of the barrier is greater than the thickness of the film semi-finished product.

7. The polyimide film casting machine according to claim 1, wherein: The left side of the casting die is fixedly connected with a scraping seat; the scraping seat is provided with a scraping groove; the scraping groove is slidably connected with a scraping plate; the scraping groove is threadedly connected with a first bolt outward.

8. The polyimide film casting machine according to claim 1, wherein: The right side of the casting die is fixedly connected with an adjusting seat; one side of the adjusting seat facing the casting die is provided with an adjusting groove; the adjusting groove is in communication with the opening inner side of the casting die; a plurality of adjusting blocks sliding left and right are provided in the adjusting groove along the front and back directions; the right side of the adjusting block is rotationally connected with a second bolt; the second bolt is threadedly connected with the adjusting seat.

9. The polyimide film casting machine according to claim 1, wherein: The inner side of the steel belt is supported by a support seat; the support seat is fixedly connected with the inner wall of the case.

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