Polyimide film casting machine

Abstract

The invention relates to the technical field of film casting, in particular to a polyimide film casting machine. Comprising a case and a casting roller which is arranged on the inner side of the case and is driven by a first motor; the two casting rollers are in left-right transmission connection with a steel belt; a plurality of drying interfaces are formed in the bottom and the top of the case; the lower position of the right port of the case is rotationally connected with a demolding roller; a casting die head is arranged on the inner side of the case and is positioned at the right position of the upper surface of the steel belt; the casting die head covers the outer surface of a steel belt with a material, then the material is dried to form a film semi-finished product, and the film semi-finished product is guided out through the demolding roller; according to the invention, the plurality of baffle pieces are arranged on the outer surface of the steel belt in the width direction at intervals in the transmission process, so that a liquid film on the steel belt can be separated into a plurality of independent liquid films by the plurality of baffle pieces, a film semi-finished product subjected to tape casting meets the target width, the subsequent slitting process is omitted, the production efficiency is improved, and the production cost is reduced. And the defects of thin film finished products 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 method of forming and then slitting has obvious limitations: on the one hand, it adds an extra production process, which prolongs the overall processing cycle, reduces production efficiency, and also increases equipment investment and energy consumption costs accordingly. On the other hand, the slitting process is prone to uneven edges, especially since polyimide film itself has high mechanical strength. If the force is uneven or the tool accuracy is insufficient during slitting, it will cause defects such as burrs and warping on the edges, affecting product quality and subsequent performance such as fit and sealing during use. In addition, the slitting operation may also damage the internal structure of the film due to improper tension control, destroying its original dimensional stability and mechanical properties, and thus affecting its application reliability in high-end fields. As the market's quality requirements and production efficiency demands for polyimide film continue to increase, the disadvantages of the traditional slitting process have become increasingly prominent, and there is an urgent need to improve the existing production methods to solve the above problems. Summary of the Invention

[0006] In order to make up for the shortcomings of the existing technology, the present invention proposes a polyimide film casting machine. The present invention arranges a plurality of baffles at intervals along the width direction on the outer surface of the steel belt during the transmission process, so that the plurality of baffles can separate the liquid film on the steel belt into a plurality of independent liquid films, and then the semi-finished film after cast molding meets the target width, omitting the subsequent slitting process, improving production efficiency, and avoiding defects in the finished film caused by slitting.

[0007] The technical solution adopted by the present invention to solve its technical problems is: the polyimide film casting machine described in the present invention includes a chassis and a casting roller driven by a first motor inside the chassis; the two casting rollers are connected to the steel belt in a left and right transmission manner; a plurality of drying interfaces are provided at the bottom and top of the chassis; the lower position of the right port of the chassis is rotatably connected to the demolding roller; a casting die is provided on the inside of the chassis and located on the right side of the upper surface of the steel belt; the casting die covers the material on the outer surface of the steel belt and then dries it to form a film semi-finished product, which is then discharged through the demolding roller; a baffle is provided on the outer surface of the steel belt; the baffle is in sealing contact with the outer surface of the steel belt; the thickness of the baffle is greater than the thickness of the film semi-finished product; a single baffle starts from the right side of the upper surface of the steel belt, goes around the left end of the steel belt counterclockwise, and ends at the right side of the lower surface of the steel belt; a plurality of baffles are distributed at corresponding positions in the front and rear directions.

[0008] Preferably, the barrier is shaped like a conveyor belt; a U-shaped frame is provided on the inner side of the barrier; the opening of the U-shaped frame faces right; the U-shaped frame is located on the inner side of the barrier; the U-shaped frame is provided with multiple dumbbell holes along the transmission direction; the dumbbell holes pass through the U-shaped frame front and back; a dumbbell wheel is rotatably connected in the dumbbell hole; the barrier is transmission-connected to the outside of the dumbbell wheel.

[0009] Preferably, the U-shaped frame is provided with adjustment slots running through the front and rear; an adjustment plate is slidably connected in the adjustment slot; the adjustment plate is fixedly connected to the front and rear inner walls of the chassis; and an operation window is provided on the top of the chassis.

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

[0011] Preferably, the front and rear inner walls of the chassis are rotatably connected to the synchronization rod; the outer wall of the synchronization rod is provided with a strip-shaped synchronization groove along the axial direction; the synchronization block is slidably connected in the synchronization groove; a group of corresponding front and rear dumbbell wheels are penetrated by synchronization holes; 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 chassis is fixedly connected to the housing of the second motor; the output shaft of the second motor is fixedly connected to the rear end of the synchronization rod.

[0012] Preferably, 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 away from the steel belt; the tilting height of the starting end of the barrier is greater than the thickness of the liquid film.

[0013] Preferably, the cut-off end of the barrier is tilted in a direction away from the steel strip; and the tilting height of the cut-off end of the barrier is greater than the thickness of the semi-finished film.

[0014] Preferably, the left side of the casting die is fixedly connected to a scraper seat; a scraper groove is provided in the scraper seat; a scraper plate is slidably connected in the scraper groove; and the scraper groove is threadedly connected to a first bolt facing outward.

[0015] Preferably, the right side of the casting die is fixedly connected to the adjustment seat; the adjustment seat is provided with an adjustment groove on the side facing the casting die; the adjustment groove is connected to the inner side of the casting die opening; the inner side of the adjustment groove is provided with a plurality of adjustment blocks that slide left and right along the front-back direction; the right side of the adjustment block is rotatably connected to the second bolt; the second bolt is threadedly connected to the adjustment seat.

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

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

[0018] 1. The present invention arranges a plurality of baffles at intervals along the width direction on the outer surface of the steel belt during the transmission process, so that the plurality of baffles can separate the liquid film on the steel belt into a plurality of independent liquid films, and then the semi-finished film after cast molding meets the target width, omitting the subsequent slitting process, improving production efficiency, and avoiding defects in the finished film caused by slitting.

[0019] 2. The barrier member in the present invention can be transmitted along with the transmission of the steel belt, so the inner half of the barrier member and the outer surface of the steel belt remain relatively stationary. Therefore, the inner half of the barrier member remains relatively stationary with the separated independent liquid film, thereby avoiding the problem of uneven edge of the liquid film caused by displacement of the barrier member during the drying and forming process of the liquid film, thereby improving the edge integrity of the film semi-finished product and enhancing the quality of the film semi-finished product.

[0020] 3. In the present invention, the operator can observe the position of the baffle inside the chassis through the operating window, and adjust the position of the baffle in the width direction of the steel strip to make the width of the semi-finished film adjustable, thereby better meeting the production requirements of the finished film. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

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

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

[0024] Figure 3 It is a three-dimensional cross-sectional view of the present invention;

[0025] Figure 4 yes Figure 3 Enlarged view of point A in the middle;

[0026] Figure 5 yes Figure 3 Enlarged view of point B in the middle;

[0027] Figure 6 yes Figure 3 Enlarged view of point C in the middle;

[0028] Figure 7 is a planar cross-sectional view of the present invention;

[0029] Figure 8 It is a structural diagram of the casting die of the present invention;

[0030] Figure 9 It is a diagram of the internal structure of the chassis of the present invention;

[0031] Figure 10 It is a three-dimensional diagram of the partition and the U-shaped frame of the present invention;

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

[0033] Figure 12 is a three-dimensional diagram of the adjustment rod of the present invention;

[0034] Figure 13 yes Figure 10 Exploded diagram;

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

[0036] In the figure: chassis 1, first motor 11, casting roller 12, steel belt 13, drying interface 14, film stripping roller 15, operating window 16, second motor 17, support seat 18, casting die head 2, baffle 3, U-shaped frame 4, dumbbell hole 41, dumbbell wheel 42, adjustment groove 43, adjustment plate 44, adjustment hole 45, adjustment rod 46, arc strip 47, card block 48, synchronization hole 49, synchronization rod 5, synchronization groove 51, synchronization block 52, scraper seat 6, scraper groove 61, scraper 62, first bolt 63, adjustment seat 7, adjustment groove 71, adjustment block 72, second bolt 73. DETAILED DESCRIPTION

[0037] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

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

[0039] Embodiment 1: A polyimide film casting machine comprises a chassis 1 and a casting roller 12 driven by a first motor 11 inside the chassis 1; the two casting rollers 12 are connected to a steel belt 13 in a left-right transmission manner; a plurality of drying interfaces 14 are provided at the bottom and top of the chassis 1; the lower position of the right port of the chassis 1 is rotatably connected to a demolding roller 15; a casting die 2 is provided on the inside of the chassis 1 and located on the right side of the upper surface of the steel belt 13; the casting die 2 covers the material on the outer surface of the steel belt 13 and then dries it to form a film semi-finished product, which is then discharged through the demolding roller 15; a baffle 3 is provided on the outer surface of the steel belt 13; the baffle 3 is in sealing contact with the outer surface of the steel belt 13; the thickness of the baffle 3 is greater than the thickness of the film semi-finished product; a single baffle 3 starts from the right side of the upper surface of the steel belt 13, goes around the left end of the steel belt 13 counterclockwise, and ends at the right side of the lower surface of the steel belt 13; a plurality of baffles 3 are distributed at corresponding positions in the front and rear directions.

[0040] First, amine filtration is performed, acetamide is placed in an amine filtration kettle, diamine is added to dissolve it, and then filtered into a reactor; then in the resin synthesis process, dianhydride is added to the diamine solution in batches for polymerization to form a polyamic acid resin solution (PAA); then the PAA solution is filtered once and enters a defoaming kettle for defoaming and then filtered twice; only then can it enter the salivation process, and the resin is passed through a metering pump from the salivation die head 2 to be coated on the steel belt 13 to form a liquid film, and the first motor 11 will drive the casting roller 12 to rotate, thereby driving the steel belt 13 for transmission. The first motor 11 is located at the rear side of the chassis 1, and the housing of the first motor 11 is fixedly connected to the chassis 1, and the output shaft of the first motor 11 is connected to one of the casting rollers 12, and the inner wall of the steel belt 13 and the casting roller 12 can be For anti-slip treatment, 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 will drive the liquid film to move left and pass through multiple barriers 3. The thickness of the barriers 3 is much larger than the thickness of the liquid film, so the liquid film cannot cross the barriers 3, two of which are in contact with the front and rear inner walls of the chassis 1 respectively. The width of the steel belt 13 is adapted to the distance between the front and rear inner walls of the chassis 1. The multiple barriers 3 spaced apart at front and back intervals will form multiple casting channels. The width of the casting channels is adapted to the width of the finished film after forming. After being separated and blocked by the barrier 3, the liquid film will enter the multiple casting channels. The entire liquid film will be divided into multiple liquid films of required width by multiple barriers 3. The steel belt 13 will drive The liquid film moves along the casting channel, and multiple drying interfaces 14 are set at the top and bottom of the chassis 1. The drying interfaces 14 are connected to the external drying pipes. The hot air in the chassis 1 flows in two sections. The first section enters from the right position of the bottom of the chassis 1, passes through the inside of the chassis 1 and flows out along the left position of the top of the chassis 1. The second section enters from the left position of the top of the chassis 1, passes through the inside of the chassis 1 and flows out along the right position of the top of the chassis 1, so that the hot air inside the chassis 1 can fully contact with the liquid film on the steel belt 13 to achieve drying of the liquid film. During the drying process, the barrier 3 will separate the multiple liquid films in the width direction so that the multiple liquid films will not be reconnected together, so that the multiple liquid films are disconnected in the width direction. After drying, the solvent of the liquid film is volatilized to form a solid film, i.e., a semi-finished film. The film will be separated by the barrier 3 during the entire drying process. After the semi-finished film is formed, it will separate from the barrier 3 and be guided to the demolding roller 15 as the steel belt 13 drives it. The semi-finished film will gradually separate from the steel belt 13 and be moved out from the right port of the chassis 1 as the demolding roller 15 guides it to enter the next process. The semi-finished film will enter the stretching / imidization process, and will be formed into a polyimide film through high-temperature imidization and simultaneous biaxial stretching. The solvent waste gas volatilized in the salivation and imidization process will be treated by a condenser and a two-stage molecular sieve, and will be discharged through an exhaust pipe together with the waste gas treated by the two-stage molecular sieve in the stretching process. Finally, the finished film will be rolled up, inspected, and then packaged.

[0041] The present invention arranges a plurality of baffles 3 at intervals along the width direction on the outer surface of the steel belt 13 during the transmission process, so that the plurality of baffles 3 can separate the liquid film on the steel belt 13 into a plurality of independent liquid films, and then the semi-finished film after cast molding meets the target width, omitting the subsequent slitting process, improving production efficiency, and avoiding defects in the finished film caused by slitting.

[0042] Example 2: The barrier 3 is shaped like a conveyor belt; a U-shaped frame 4 is provided on the inner side of the barrier 3; 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; the U-shaped frame 4 is provided with a plurality of dumbbell holes 41 along the transmission direction; the dumbbell holes 41 pass through the U-shaped frame 4 front and back; a dumbbell wheel 42 is rotatably connected in the dumbbell hole 41; the barrier 3 is transmission-connected to the outer side of the dumbbell wheel 42.

[0043] The barrier 3 in the shape of a conveyor belt is divided into an inner half close to the steel belt 13 and an outer half away from the steel belt 13. The inner half of the barrier 3 is in contact and sealed with the outer surface of the steel belt 13 and is driven along with the transmission of the outer surface of the steel belt 13. The outer surface of the steel belt 13 will drive the liquid film through the barrier 3. The inner half of the barrier 3 has sufficient thickness to separate the liquid film into multiple independent liquid films. The independent liquid films will move along the casting channel along with the transmission of the steel belt 13. Since the barrier 3 is connected to the outside of the U-shaped frame 4 through the dumbbell wheel 42, the barrier 3 has a large friction with the outer surface of the steel belt 13, so the barrier 3 can be driven along with the transmission of the steel belt 13. Therefore, the inner half of the barrier 3 and the outer surface of the steel belt 13 remain relatively stationary. Part is kept relatively still with the separated independent liquid film, thus avoiding the problem of uneven edge of the liquid film caused by displacement of the barrier 3 during the drying and molding process of the liquid film, thereby improving the edge integrity of the film semi-finished product and improving the quality of the film semi-finished product; the position of the barrier 3 close to the casting die 2 is the starting end, and the position of the barrier 3 close to the demolding roller 15 is the ending end. The inner half of the barrier 3 will be separated from the film semi-finished product at the ending end, that is, the inner half of the barrier 3 will be separated from the film semi-finished product after the drying is completed, thereby improving the quality of the film semi-finished product; the barrier 3 is transmission-connected to the outside of the dumbbell wheel 42, and anti-slip structures such as protrusions can be set on the inner surface of the barrier 3 and the outer surface of the dumbbell wheel 42 to achieve the anti-slip purpose, thereby improving the transmission stability of the barrier 3.

[0044] Example 3: The U-shaped frame 4 is provided with adjustment slots 43 running through the front and back; an adjustment plate 44 is slidably connected in the adjustment slot 43; the adjustment plate 44 is fixedly connected to the front and back inner walls of the chassis 1; an operation window 16 is provided on the top of the chassis 1.

[0045] In this embodiment, the U-shaped frame 4 is provided with adjustment holes 45 running through it front and back; all the adjustment holes 45 pass through the adjustment rods 46 front and back; the adjustment rods 46 are rotatably connected to the chassis 1; the rear end of the adjustment rods 46 extends to the outside of the chassis 1; the outer wall of the adjustment rod 46 is fixedly connected to a plurality of arc strips 47 along the length direction; the thickness of the arc strips 47 decreases in the clockwise direction; the inner wall of the adjustment hole 45 is fixedly connected to the block 48; the thickness of the block 48 decreases in the counterclockwise direction.

[0046] After opening the operating window 16, the operator can observe the position of the baffle 3 inside the chassis 1 through the operating window 16, and by adjusting the position of the baffle 3 in the width direction of the steel belt 13, the width of the semi-finished film can be adjusted, thereby better meeting the production needs of the finished film. In order to avoid the displacement of the baffle 3 during the casting process, an adjusting hole 45 is opened on the U-shaped frame 4, and the block 48 inside the adjusting hole 45 is clamped by the arc 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 will be rotated first, and the adjusting rod 46 will drive multiple arcs after rotating counterclockwise. When the bar 47 rotates counterclockwise, multiple arc-shaped bars 47 will break away from contact with the block 48, and the block 48 will move relatively out of the gap between adjacent arc-shaped bars 47, so that the block 48 is unlocked, that is, the block 48 can move with the front and rear movement of the barrier 3. After completing the position adjustment of the barrier 3, the adjusting rod 46 is rotated clockwise again, and the adjusting rod 46 will drive the multiple arc-shaped bars 47 on the outer wall to rotate clockwise, so that the block 48 re-enters the arc-shaped bar 47, and the block 48 is locked. In this way, multiple U-shaped frames 4 are locked together with the barrier 3 in the front and rear directions, thereby improving the stability of the barrier 3 during the film casting process.

[0047] Example 4: The front and rear inner walls of the chassis 1 are rotatably connected to the synchronization rod 5; the outer wall of the synchronization rod 5 is provided with a strip-shaped synchronization groove 51 along the axial direction; the synchronization block 52 is slidably connected in the synchronization groove 51; a group of corresponding front and rear dumbbell wheels 42 are penetrated by synchronization holes 49; the synchronization rod 5 passes through the synchronization hole 49; the synchronization block 52 is fixedly connected to the inner wall of the synchronization hole 49; the rear side of the chassis 1 is fixedly connected to the housing of the second motor 17; the output shaft of the second motor 17 is fixedly connected to the rear end of the synchronization rod 5.

[0048] In order to prevent the barrier 3 and the steel belt 13 from slipping, which causes relative displacement between the barrier 3 and the liquid film on the steel belt 13, the barrier 3 is controlled to be driven by the second motor 17, and the steel belt 13 is driven by the first motor 11. The second motor 17 will drive the synchronous rod 5 to rotate during operation, and the synchronous rod 5 will drive the synchronous block 52 in the synchronous groove 51 to rotate during rotation. The synchronous block 52 will rotate with the rotation of the synchronous rod 5 under the restriction of the synchronous groove 51. The synchronous block 52 will drive the dumbbell wheel 42 to rotate during rotation. The contact position between the outer wall of the dumbbell wheel 42 and the barrier 3 can be provided with an anti-skid structure to avoid slipping. The dumbbell wheel 42 will drive the barrier 3 during rotation, and the second motor 17 drives the steel belt 13 The transmission speed is consistent with the transmission speed of the barrier 3 to ensure that the outer surface of the steel belt 13 and the inner half of the barrier 3 do not produce relative displacement, thereby ensuring the stability of the liquid film during drying; and when it is necessary to adjust the position of the barrier 3 in the front and rear directions, the U-shaped frame 4 will drive the dumbbell wheel 42 forward or backward, and the dumbbell wheel 42 will drive the synchronization block 52 forward or backward in the synchronization groove 51. In this way, after the dumbbell wheel 42 and the U-shaped frame 4 complete the movement, the front and rear corresponding groups of dumbbell wheels 42 can still be kept in synchronous rotation, so that multiple front and rear barrier members 3 can be driven at the same speed, avoiding the situation where the front and rear barrier members 3 of the liquid film have different transmission speeds and cause uneven edges, thereby further improving the quality of the film semi-finished product.

[0049] Example 5: The position of the barrier 3 close to the casting die 2 is the starting end, and the position of the barrier 3 close to the demolding roller 15 is the ending end; the starting end of the barrier 3 is tilted away from the steel belt 13; the tilting height of the starting end of the barrier 3 is greater than the thickness of the liquid film.

[0050] In this embodiment, the end of the barrier 3 is tilted away from the steel strip 13 ; the tilted height of the end of the barrier 3 is greater than the thickness of the semi-finished film.

[0051] Since the starting end of the barrier 3 is tilted away from the steel belt 13, the liquid film will be gradually separated by the barrier 3 during the contact between the starting end of the barrier 3 and the liquid film, thereby avoiding the problems of liquid film splashing and liquid film flanging wrinkles caused by the rapid separation of the liquid film and the barrier 3. After the liquid film is slowly separated, the excess part of the separated liquid film edge will slowly flow to other positions, making the liquid film smoother and the edge smoother. In addition, the tilted starting end of the barrier 3 increases the contact area with the liquid film, so that the liquid film is driven by friction to enter the casting channel more smoothly, reducing the accumulation of the liquid film at the starting end of the barrier 3. Improve the smoothness of the liquid film; the raised design of the cut-off end of the barrier 3 solves the problem of edge damage when the film semi-finished product is separated from the barrier 3. After the liquid film is dried to form the film semi-finished product, there is no transition in the process of separating the cut-off end of the barrier 3 from the film semi-finished product, and the film semi-finished product may be torn, resulting in an increased risk of burrs forming on the film semi-finished product; and by raising the cut-off end of the barrier 3, the film semi-finished product will slowly and gradually separate from the barrier 3 along the raised inclined surface, the contact area gradually decreases with the transmission process, the friction force is evenly released, and the edge damage is effectively avoided, thereby ensuring the quality of the film semi-finished product.

[0052] Example 6: The left side of the casting die 2 is fixedly connected to a scraper seat 6; a scraper groove 61 is provided in the scraper seat 6; a scraper plate 62 is slidably connected in the scraper groove 61; and a first bolt 63 is threadedly connected to the scraper groove 61 outwardly.

[0053] The scraper 62 is unlocked by turning the first bolt 63 away from the scraper 62. By controlling the vertical position of the scraper 62 in the scraper groove 61, the gap between the scraper 62 and the outer surface of the steel belt 13 is changed. The gap is the thickness of the liquid film, and the thickness is adjusted. After the position adjustment of the scraper 62 is completed, the first bolt 63 is tightened against the outer wall of the scraper 62 to lock the scraper 62.

[0054] Example 7: The right side of the casting die 2 is fixedly connected to the adjustment seat 7; the adjustment seat 7 is provided with an adjustment groove 71 on the side facing the casting die 2; the adjustment groove 71 is connected to the inner side of the opening of the casting die 2; the inner side of the adjustment groove 71 is provided with a plurality of adjustment blocks 72 that slide left and right along the front-back direction; the right side of the adjustment block 72 is rotatably connected to the second bolt 73; the second bolt 73 is threadedly connected to the adjustment seat 7.

[0055] Tightening the second bolt 73 can drive the adjustment block to move in the adjustment groove 43 away from the bottom of the adjustment groove 43 or close to the bottom of the adjustment groove 43. The degree to which the adjustment block extends into the inner side of the opening of the casting die 2 will directly affect the discharge thickness of the opening of the casting die 2. In the transmission direction, the adjustment block corresponding to the baffle 3 is controlled to fully extend into the inner side of 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 of the baffle 3 to separate the liquid film, and also avoiding the discharge amount of the casting die 2 from affecting the liquid film thickness more.

[0056] Example 8: A support base 18 is supported on the inner side of the steel belt 13 ; 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 belt 13 to ensure the flatness of the steel belt 13. A rolling column can be set at the position where the support seat 18 contacts the steel belt 13 to reduce friction.

[0058] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood 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 cannot be understood as indicating or implying relative importance.

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

Claims

1. A polyimide film casting machine, comprising a chassis and casting rollers driven by a first motor inside the chassis; two casting rollers are connected to a steel belt in a left and right driving manner; a plurality of drying interfaces are provided at the bottom and top of the chassis; a stripping roller is rotatably connected to a lower position of the right end of the chassis; a casting die is provided inside the chassis and located to the right of the upper surface of the steel belt; the casting die coats the material on the outer surface of the steel belt, dries the material, and forms a semi-finished film, which is then discharged through the stripping roller; and the machine is characterized in that: A barrier is provided 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; a single barrier starts from the right side of the upper surface of the steel belt, goes around the left end of the steel belt counterclockwise, and ends at the right side of the lower surface of the steel belt; multiple barrier members are distributed at corresponding positions in the front and rear directions.

2. A polyimide film casting machine according to claim 1, characterized in that: The barrier is in the shape of a conveyor belt; a U-shaped frame is provided on the inner side of the barrier; the opening of the U-shaped frame faces right; the U-shaped frame is located on the inner side of the barrier; the U-shaped frame is provided with multiple dumbbell holes along the transmission direction; the dumbbell holes pass through the U-shaped frame front and back; a dumbbell wheel is rotatably connected in the dumbbell hole; the barrier is transmission-connected to the outside of the dumbbell wheel.

3. A polyimide film casting machine according to claim 2, characterized in that: The U-shaped frame is provided with adjustment slots at the front and rear; an adjustment plate is slidably connected in the adjustment slot; the adjustment plate is fixedly connected to the front and rear inner walls of the chassis; and an operation window is provided on the top of the chassis.

4. A polyimide film casting machine according to claim 3, characterized in that: The U-shaped frame is provided with adjustment holes running through it front and back; all the adjustment holes pass through the adjustment rod front and back; the adjustment rod is rotatably connected to the chassis; the rear end of the adjustment rod extends to the outside of the chassis; the outer wall of the adjustment rod is fixedly connected to a plurality of arc strips along the length direction; the thickness of the arc strips decreases in the clockwise direction; the inner wall of the adjustment hole is fixedly connected to a card block; the thickness of the card block decreases in the counterclockwise direction.

5. A polyimide film casting machine according to claim 3, characterized in that: The front and rear inner walls of the chassis are rotatably connected to a synchronization rod; the outer wall of the synchronization rod is provided with a strip-shaped synchronization groove along the axial direction; the synchronization block is slidably connected in the synchronization groove; a pair of corresponding front and rear dumbbell wheels are penetrated by synchronization holes; 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 chassis is fixedly connected to the housing of the second motor; the output shaft of the second motor is fixedly connected to the rear end of the synchronization rod.

6. A polyimide film casting machine according to claim 2, characterized in that: 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 away from the steel belt; the tilting height of the starting end of the barrier is greater than the thickness of the liquid film.

7. A polyimide film casting machine according to claim 6, characterized in that: The cut-off end of the barrier is tilted in a direction away from the steel strip; and the tilting height of the cut-off end of the barrier is greater than the thickness of the semi-finished film.

8. The polyimide film casting machine according to claim 1, wherein: The left side of the casting die head is fixedly connected to a scraper seat; a scraper groove is provided in the scraper seat; a scraper plate is slidably connected in the scraper groove; and the scraper groove is connected to a first bolt with an outward thread.

9. A polyimide film casting machine according to claim 1, characterized in that: The right side of the casting die is fixedly connected to the adjustment seat; the adjustment seat is provided with an adjustment groove on the side facing the casting die; the adjustment groove is connected to the inner side of the casting die opening; the inner side of the adjustment groove is provided with multiple adjustment blocks that slide left and right along the front-back direction; the right side of the adjustment block is rotatably connected to the second bolt; the second bolt is threadedly connected to the adjustment seat.

10. The polyimide film casting machine according to claim 1, characterized in that: The inner side of the steel belt is supported by a support base; the support base is fixedly connected to the inner wall of the chassis.

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