Modularly combined production line for polyimide film

Abstract

Disclosed is a modularly combined production line for a polyimide film, said production line comprising a casting machine, a peeling chamber, and a tenter machine; the tenter machine is formed by connecting and combining tenter box units that can be combined. The tenter box units are divided into ceramic heating subunits or hot-air heating subunits. There are two or more tenter box units, and each tenter box unit comprises at least one ceramic heating subunit and one hot-air heating subunit. According to the present invention, a modular design and configuration are used to achieve remote production and assembly, and facilitate disassembly and mounting. The tenter machine part has tenter box structures that can be freely combined in different forms, particularly allowing flexible use of respective advantageous properties of the ceramic heating subunits and hot-air heating subunits to meet different film requirements, thus fully improving production flexibility and convenience, as well as enhancing the precision of temperature control, thereby better satisfying the production needs of polyimide films and contributing to improved film product quality.

Description

A modular composite polyimide film production line Technical Field

[0001] This invention belongs to the field of thin film manufacturing technology, and specifically relates to a modular combined polyimide film production line. Background Technology

[0002] A common method for producing polyimide (PI) films involves first casting the raw materials to obtain a precursor film, followed by stretching and imidization reactions to ultimately obtain the desired polyimide film. This process requires precise temperature control, especially when stretching and imidization are performed in a cross-stretching machine. Furthermore, different conveying and heating conditions are sometimes necessary depending on the specific requirements. Existing cross-stretching machines have a simple structure and cannot meet the demanding requirements for high-quality polyimide film products, both now and in the future. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a modular polyimide film production line, which solves the problems of poor temperature control methods and accuracy and difficulty in flexible adjustment in the existing technical solutions, thereby better meeting the production needs of polyimide films and helping to improve the quality of film products.

[0004] According to the technical solution of the present invention, the present invention provides a modular polyimide film production line, including a casting machine, a peeling chamber and a horizontal stretching machine; the horizontal stretching machine is composed of horizontal stretching box units that can be combined, the horizontal stretching box units are divided into ceramic heating sub-units or hot air heating sub-units, there are two or more sets of horizontal stretching box units, and the horizontal stretching box unit includes at least one ceramic heating sub-unit and one hot air heating sub-unit.

[0005] In some embodiments, the ceramic heating subunit is provided with a thin film inlet and a thin film outlet, and multiple individually detachable temperature control modules are provided between the thin film inlet and the thin film outlet. The temperature control modules are arranged side by side in the direction of film travel. The temperature control module consists of multiple individually detachable horizontal pull box ceramic temperature control units, and each horizontal pull box ceramic temperature control unit is provided with a temperature measuring device and a temperature control device.

[0006] In some embodiments, a horizontal negative pressure air curtain device is provided at the inlet and outlet of the horizontal box unit. The horizontal negative pressure air curtain device includes a first exhaust section and a second exhaust section of the horizontal negative pressure air curtain arranged opposite to each other. At least one flow equalization plate is provided in both the first exhaust section and / or the second exhaust section of the horizontal negative pressure air curtain. A channel space is formed between the first exhaust section and the second exhaust section of the horizontal negative pressure air curtain.

[0007] In some embodiments, the horizontal stretching machine has an amplitude adjustment device, which includes a horizontal stretching frame and two horizontally independently arranged guide rail fixing seats. Each guide rail fixing seat is slidably mounted on the horizontal stretching frame, and each guide rail fixing seat is connected to an amplitude adjustment mechanism. Each amplitude adjustment mechanism independently drives the guide rail fixing seat to move or drives the guide rail fixing seat to move synchronously through a synchronization mechanism.

[0008] In some embodiments, the stripping chamber is a sealed box structure with at least a film inlet, an outlet, and a ventilation system. A stripping negative pressure air curtain device is provided at the film inlet of the stripping chamber. The stripping negative pressure air curtain device includes a first stripping negative pressure air curtain exhaust section and a second stripping negative pressure air curtain exhaust section arranged opposite to each other. At least one flow equalization plate is provided in the first stripping negative pressure air curtain exhaust section and / or the second stripping negative pressure air curtain exhaust section. The first stripping negative pressure air curtain exhaust section and the second stripping negative pressure air curtain exhaust section are respectively located on the upper and lower sides of the film conveying path, and a channel space for film passage is formed between the first exhaust section and the second exhaust section.

[0009] In some embodiments, the peeling chamber has a multi-roller system; the multi-roller system includes guide rollers, traction rollers, and gravity rollers mounted on the multi-roller system frame; the guide rollers are driven rollers; a peeling roller is located after the casting machine; the traction roller is located downstream of the peeling roller, and one or more guide rollers are spaced apart between the traction roller and the peeling roller; the traction roller includes two adjacent drive rollers, and the film transport path at the traction roller has an S-shaped structure; the gravity roller is located downstream of the traction roller, and one or more guide rollers are spaced apart between the gravity roller and the traction roller; the gravity roller is a driven roller, and its upstream and downstream sides are adjacent to the guide rollers, and the height of the gravity roller is lower than that of the guide rollers on both sides; the gravity roller and the gravity roller counterweight mechanism are mounted on the same closed chain or on two closed chains respectively through a synchronous transmission mechanism.

[0010] In some embodiments, the multi-roller system also includes two side pressure rollers, which are located at the two side edges of the multi-roller system, on the upper and / or lower sides of the film conveying path, and there is a gap between the two side pressure rollers and the film conveying path.

[0011] And / or, the multi-roller system also includes a flame-retardant roller assembly, which includes a flame-retardant pressure roller and a flame-retardant guide roller. The flame-retardant pressure roller is mounted on the balancing mechanism, and the flame-retardant guide roller is one of the guide rollers. Under normal conditions, the flame-retardant pressure roller and the flame-retardant guide roller are in a non-closed state. In the event of a fire, the balancing mechanism drives the flame-retardant pressure roller and the flame-retardant guide roller to close.

[0012] In some embodiments, the casting machine includes an active drum, a passive drum, and a steel belt drivenly connected to the active and passive drums. It also includes an upper drying tunnel, a passive drum chamber, and a lower drying tunnel sequentially connected along the steel belt conveying direction. Multiple temperature zones are formed within the upper, passive, and lower drying tunnels, each of which is an adjustable temperature zone. A casting negative pressure air curtain device is provided at the adjacent points of two temperature zones, as well as at the inlet and outlet of the upper and lower drying tunnels. The casting negative pressure air curtain device includes a first and a second exhaust section of the casting negative pressure air curtain, which are arranged opposite each other. The first and second exhaust sections are located on opposite sides of the steel belt, and a channel space is formed between them for the steel belt to pass through. This channel space is adapted to the width of the steel belt.

[0013] In some embodiments, the temperature zone includes at least a first temperature zone, an upper drying tunnel temperature zone, a curved drying tunnel temperature zone, and a lower drying tunnel temperature zone; the upper drying tunnel has at least one first temperature zone, which is located near the entrance of the upper drying tunnel; a parallel air circulation treatment device is provided in the first temperature zone, which includes a parallel air duct inlet and a parallel air duct outlet arranged opposite to each other, the parallel air duct inlet and outlet being located above and below the steel belt, or only above the steel belt; the upper drying tunnel also has at least one upper drying tunnel temperature zone, which is located between the first temperature zone and the passive rotating drum chamber; The drying tunnel temperature zone is equipped with an upper drying tunnel longitudinal air circulation treatment device at least above the steel belt, and the nozzles of the upper drying tunnel longitudinal air circulation treatment device are facing or inclined toward the steel belt, or the nozzle orientation is adjustable; the passive drum chamber has at least one curved temperature zone, and a curved section temperature control device is provided in the curved temperature zone or on the outside of the passive drum chamber; the lower drying tunnel has at least one lower drying tunnel temperature zone, and the lower drying tunnel temperature zone is equipped with a lower drying tunnel longitudinal air circulation treatment device at least below the steel belt, and the nozzles of the lower drying tunnel longitudinal air circulation treatment device are facing or inclined toward the steel belt, or the nozzle orientation is adjustable.

[0014] In some embodiments, the casting machine includes an active drum, a passive drum, and a steel belt drivenly connected to the active drum and the passive drum. The casting machine oven includes a drying tunnel located outside the steel belt. The drying tunnel is divided into multiple temperature zones. The casting machine oven body is provided with a vent at least in the first temperature zone and / or the second temperature zone near the entrance of the drying tunnel. Temperature detection devices for detecting the temperature of the steel belt and / or concentration detection devices for detecting the concentration of solvent gas in the film raw materials are also provided in the temperature zones.

[0015] In some embodiments, it also includes an insulation board unit for the insulation box of the casting machine or the horizontal stretching machine; the insulation board unit includes a main support frame, which includes an open three-dimensional support frame consisting of a single-layer main support frame or a double-layer support frame containing at least one layer of heat insulation layer, with single-layer sealing plates directly or indirectly connected to the open sides, or one side adopts a multi-layer sealing plate with at least one layer of heat insulation material, forming a hollow cavity structure as a whole.

[0016] In some embodiments, the system also includes an insulated box for a casting machine or a horizontal stretching machine. The insulated box includes upper and lower sides of the box composed of main load-bearing insulation board units and side panels composed of side insulation board units. The main load-bearing insulation board unit includes a main support frame, which includes a hollow frame composed of a main support frame. An outer frame and an inner frame are provided on both sides of the hollow frame. The outer frame and / or the inner frame are single-layer boards or are composed of an outer sealing plate, a heat insulation plate, and an inner sealing plate, forming a hollow cavity structure. The side insulation board unit includes a first support frame and a second support frame, with a first heat insulation layer between them. The first support frame and the second support frame are connected to form a three-dimensional support with open inner and outer sides. The first support frame is directly or indirectly connected to an inner side plate, and the second support frame is directly or indirectly connected to an outer side plate, forming a hollow cavity structure.

[0017] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0018] 1. The modular polyimide film production line of the present invention adopts a modular design and a modular construction method, which enables remote production and assembly, and facilitates disassembly and installation. In particular, the horizontal stretching machine has a horizontal stretching box structure that can be freely combined in different forms. In particular, it can flexibly utilize the respective advantages of the ceramic heating subunit and the hot air heating subunit to meet different film requirements, and fully improve the flexibility and convenience of production. Furthermore, the design of the ceramic heating subunit makes the entire equipment modular and zoned, and each is equipped with a temperature measuring device and a temperature control device, which can more accurately measure the temperature of the corresponding area, and can also perform local fine-tuning of the temperature according to different temperatures, which is more conducive to the quality control of the finished film and improves product quality and yield. Preferably, air curtains are set on both sides of the box for separation purposes, which serves to relatively isolate the area from external gases or temperatures.

[0019] 2. In the modular polyimide film production line of the present invention, in the peeling chamber section, both traction rollers in the multi-roller system are active rollers. The film path is S-shaped, bypassing the two traction rollers, which increases the wrap angle and achieves tension isolation. Existing solutions typically use pressure rollers to isolate the tension before and after the film during film transport. However, since the film here is a wet film containing a lot of solvent, using pressure rollers would cause embossing and affect the film thickness. Therefore, this special traction roller structure is designed. Furthermore, this solution provides a gravity roller behind the traction roller to provide constant tension through gravity or other means, thereby adjusting the tension and performing micro-longitudinal stretching. This improves the film quality. Preferably, two pressure rollers are also provided to assist in flattening the film edges and prevent the film edges from curling. A flame-retardant roller assembly is also provided, which gently presses on the film with a slight pressure, without affecting the film. The flatness and thickness of the film surface enable fire extinguishing when the film catches fire. Furthermore, a negative pressure air curtain device is preferably included to more effectively prevent solvent gas escape, significantly improving the stability of process environment control and system safety. The amplitude adjustment device is also preferably improved. When the rods, such as the lead screws, in the amplitude adjustment mechanism of the guide rail fixing seat expand due to heat, since the two guide rail fixing seats are not connected, and the amplitude adjustment mechanism and preferably the amplitude adjustment track are independently set, both guide rail fixing seats have ample space to move left and right to accommodate the deformation caused by thermal expansion, ensuring that the structure will not be deformed or damaged due to thermal expansion. Simultaneously, it is preferable to be able to synchronously control the two amplitude adjustment mechanisms, allowing the two guide rail fixing seats to symmetrically approach or move away from each other, facilitating operation. Therefore, it has better adaptability to temperature changes, a longer service life, and helps to achieve higher temperature processing.

[0020] 3. In the modular polyimide film production line of the present invention, the casting machine section is divided into multiple adjustable temperature zones within the drying oven. This allows for more precise control of the various process times, temperatures during the hardening state, and drying methods of the film material. Specifically, a parallel air duct is used to blow preheating air into the first temperature zone when the film slurry first enters the drying tunnel. This ensures the surface of the film slurry begins to harden and maintains airflow, preventing hot air from directly blowing onto the film surface and affecting film quality. Furthermore, a curved temperature zone is provided at the passive drum to continue heating the film or to more effectively maintain its temperature, avoiding the natural temperature drop that occurs with existing equipment. Consequently, as the film continues into the next drying tunnel, the temperature change is essentially continuous without significant abrupt fluctuations. After passing through the first temperature zone, the film surface hardens sufficiently to withstand the hot air, allowing subsequent hot air to be blown generally directly onto the film surface for more direct and efficient heat transfer and accelerated solvent evaporation. Preferably… Equipped with a negative pressure air curtain device, two opposing exhaust units simultaneously draw air, forming a negative pressure air curtain in the channel space between the two exhaust units. The membrane can be transported between the two spaces through the channel space. Because of the negative pressure air curtain between the two spaces, problems such as temperature and gas mutual influence (e.g., escape / cross-contamination of gases with different temperatures and compositions) are avoided, effectively ensuring the accuracy and stability of process environment control for high-end processes. At the same time, since the airflow of adjacent temperature zones is drawn towards the center, a certain temperature transition zone is formed between adjacent temperature zones, which can further avoid sudden changes in ambient temperature when the membrane enters and exits the temperature zone. Furthermore, it is preferable to control the temperature and monitor the status of multiple temperature zones separately, and to set up explosion vents for depressurization in extreme cases. Taking multiple perspectives, it is convenient to take timely measures in multiple stages as extreme situations gradually evolve, thereby effectively ensuring the safety of equipment and personnel.

[0021] 4. In the modular polyimide film production line of this invention, the insulation box of the horizontal stretching machine and the casting machine is formed by insulation board units in conjunction with upper and lower load-bearing units. The main load-bearing insulation board unit adopts a double-stage thermal break insulation method, filling the cavity formed by the board with insulation cotton, so that the inner and outer sides of the box wall panels do not directly contact each other, dividing it into at least two different temperature zones, preventing internal heat from being transferred to the outside and causing overheating of the outer surface of the box. The inner and outer layers of the board adopt a sandwich insulation method including insulation layers, providing double-stage insulation, and the overall mechanical properties are better, the cost is lower, and the operation, installation and replacement are quicker and more convenient. Unlike the main load-bearing unit, the side insulation board unit does not require a high-strength counterweight frame such as channel steel, but only needs to use angle iron to make at least two layers of frames, with each layer of frames separated by... The frame incorporates a thermal insulation layer, with the hollow cavity filled with insulation cotton or other insulation materials, or arranged in layers for insulation, creating a thermal break-like insulation method. One or both of the inner and outer side panels can be sandwiched with an insulation board in between, forming a sandwich insulation system. This results in a three-layer thermal break insulation system for the entire main support frame, combined with the insulation panels to achieve a double-stage thermal break insulation. The insulation cotton filling the cavity of the main support frame prevents direct contact between the inner and outer walls of the enclosure, thus preventing heat transfer from the interior to the exterior and overheating of the outer surface. Compared to existing structures, this solution offers better mechanical performance, lower cost, and ensures the enclosure's sealing and other functional requirements. Attached Figure Description

[0022] Figure 1 is a side view schematic diagram of the overall structure of the modular combined polyimide film production line of the present invention.

[0023] Figure 2 is a top view of Figure 1.

[0024] Figure 3 is a schematic diagram of the structure of the combined ceramic heating subunit of the present invention.

[0025] Figure 4 is a perspective view of the ceramic heating subunit of the present invention from the direction of the thin film inlet.

[0026] Figure 5 is a schematic diagram of the temperature control module of the present invention, which consists of three horizontal pull box ceramic temperature control units.

[0027] Figure 6 is a cross-sectional view of Figure 5.

[0028] Figure 7 is a schematic diagram of the arrangement structure of the heating blocks of the present invention.

[0029] Figure 8 is a schematic diagram of the edge steel plate of the present invention.

[0030] Figure 9 is a cross-sectional view of the ceramic heating subunit of the present invention.

[0031] Figure 10 is a cross-sectional view of a portion of the structure of the hot air heating subunit of the present invention, wherein the arrow indicates the direction of film conveying.

[0032] Figure 11 is a three-dimensional structural diagram of a portion of the hot air heating subunit of the present invention.

[0033] Figure 12 is a three-dimensional structural schematic diagram of the amplitude modulation device of the present invention.

[0034] Figure 13 is a cross-sectional view of the right side of the amplitude modulation device shown in Figure 12.

[0035] Figure 14 is a cross-sectional view of the left side of the amplitude modulation device shown in Figure 12.

[0036] Figure 15 is a top view of the right side of the amplitude modulation device shown in Figure 12.

[0037] Figure 16 is a cross-sectional view of the stripping chamber of the present invention.

[0038] Figure 17 is a three-dimensional structural schematic diagram of the stripping chamber of the present invention.

[0039] Figure 18 is a structural schematic diagram of the stripping negative pressure air curtain device of the present invention.

[0040] Figure 19 is a three-dimensional structural schematic diagram of the stripping negative pressure air curtain device of the present invention.

[0041] Figure 20 is a rear view of the negative pressure air curtain device shown in Figure 19.

[0042] Figure 21 is a side view of the multi-roller system of the stripping chamber of the present invention.

[0043] Figure 22 is a three-dimensional structural diagram of the two pressure rollers of the present invention.

[0044] Figure 23 is a three-dimensional structural schematic diagram of the gravity roller assembly of the present invention.

[0045] Figure 24 is a structural schematic diagram of the flame-retardant roller assembly of the present invention.

[0046] Figure 25 is a cross-sectional view of the portion of the flame-retardant roller assembly other than the guide roller shown in Figure 24.

[0047] Figure 26 is a three-dimensional schematic diagram of the structure shown in Figure 25.

[0048] Figure 27 is a cross-sectional structural schematic diagram of a casting machine according to the present invention.

[0049] Figure 28 is a top view of the casting machine shown in Figure 27.

[0050] Figure 29 is a cross-sectional view of another type of casting machine according to the present invention.

[0051] Figure 30 is a cross-sectional structural schematic diagram of another type of casting machine according to the present invention.

[0052] Figure 31 is a three-dimensional structural schematic diagram of the casting negative pressure air curtain device of the present invention.

[0053] Figure 32 is a cross-sectional schematic diagram of the explosion-proof structure of the oven of another casting machine according to the present invention.

[0054] Figure 33 is a three-dimensional structural schematic diagram of a casting machine according to the present invention.

[0055] Figure 34 is a structural schematic diagram of the main load-bearing insulation board unit of the present invention.

[0056] Figure 35 is a cross-sectional view of Figure 34.

[0057] Figure 36 is a cross-sectional view of another main load-bearing insulation board unit of the present invention.

[0058] Figure 37 is a schematic diagram of the insulation board structure of the present invention, which includes two insulation board units.

[0059] Figure 38 is a cross-sectional view of the junction of two insulation board units in Figure 37.

[0060] Figure 39 is a schematic diagram of the main structure of an insulation board unit according to the present invention.

[0061] Figure 40 is a cross-sectional view of the LL plane in Figure 39, with the upper part being the inner side and the lower part being the outer side.

[0062] Figure 41 is a magnified view of part M in Figure 40.

[0063] Figure 42 is a structural schematic diagram corresponding to another embodiment at point M in Figure 40.

[0064] Figure 43 is a schematic diagram of the structure of the insulated door part of the present invention. Detailed Implementation

[0065] This invention provides a modular combined polyimide film production line, which solves the problems of poor temperature control methods and accuracy and difficulty in flexible adjustment in existing technical solutions, thereby better meeting the production needs of polyimide films and helping to improve the quality of film products.

[0066] Referring to Figures 1 and 2, this invention provides a modular polyimide film production line, comprising a casting machine A, a peeling chamber B, and a stretching machine C connected in sequence. The stretching machine C is composed of configurable stretching box units C100 connected together. Each stretching box unit C100 is divided into a ceramic heating subunit C1 or a hot air heating subunit C2. There are two or more sets of stretching box units C100, and each stretching box unit C100 includes at least one ceramic heating subunit C1 and one hot air heating subunit C2. The combination method can be arbitrarily set according to requirements. The key to this invention is that there is at least one ceramic heating subunit and one hot air heating subunit, which are connected end to end, and the film is stretched horizontally through them. Optionally, the casting machine A is also composed of configurable casting machine housings connected together from its subunits.

[0067] One or more horizontal pulling box units C100 can be set as needed. Two sets are shown in the attached drawings of this embodiment, connected end-to-end, for illustrative purposes only. Multiple individually detachable temperature control modules C3 are set between the film inlet C11 and the film outlet C12. Each temperature control module C3 is equipped with a temperature measuring device and a temperature control device. The temperature control modules C3 can be arranged side-by-side or staggered according to the film's travel direction. Here, there are two or more temperature control modules C3; in this preferred embodiment, one horizontal pulling unit contains six temperature control modules. Each temperature control module C3 is equipped with a temperature measuring device and a temperature control device, which allows for more accurate measurement of the temperature in the corresponding area and enables fine-tuning of the temperature in specific areas, thus facilitating quality control of the finished film and improving product quality and yield.

[0068] More specifically, the first aspect of the invention relates to improvements to the cross-drawing machine portion, as shown in Figures 1 to 15.

[0069] The ceramic heating subunit C1 is equipped with a film inlet C11 and a film outlet C12. The film enters through the film inlet C11 and exits through the film outlet C20. One or more ceramic heating subunits C1 can be configured as needed, connected end-to-end. Multiple individually detachable temperature control modules C3 are installed between the film inlet C11 and the film outlet C12. Each temperature control module C3 is equipped with a temperature measuring device and a temperature control device, and the modules are arranged side-by-side according to the film's travel direction. There are two or more temperature control modules C3, designed according to the actual process. Each temperature control module C3 is equipped with a temperature measuring device and a temperature control device, allowing for more accurate temperature measurement of the corresponding area and enabling fine-tuning of localized temperatures, which is more conducive to quality control of the finished film, improving product quality and yield. This temperature control module C3 consists of multiple individually detachable horizontal pull-box ceramic temperature control units C31, each equipped with a temperature measuring device and a temperature control device. In this preferred embodiment, each temperature control module C3 consists of three horizontal pull-box ceramic temperature control units C31. Each horizontal pull-box ceramic temperature control unit C31 can independently measure and control the temperature, further refining the temperature adjustment function. Furthermore, this modular design allows for the repair or replacement of only one horizontal pull-box ceramic temperature control unit C31 when it malfunctions, significantly improving production efficiency. It is understood that the hot air heating subunit C2 can also use the same or similar temperature control module.

[0070] In this embodiment, multiple heating blocks C32 are arranged below the ceramic temperature control unit C31 of the horizontal pull box. These heating blocks C32 are, for example, far-infrared ceramic heating plates. The heating blocks C32 are arranged in a matrix, with two columns of 10 blocks each shown in the attached diagram. The number of blocks can be increased or decreased as needed. Each heating block C32 is individually connected to a temperature control circuit C33, which in turn connects to a temperature control device (not shown in the diagram). This allows the heating capacity of each heating block C32 to be adjusted via the temperature control device, achieving further precise temperature control.

[0071] Each heating element C32 is mounted on a single mounting base plate C34. This mounting base plate C34 is spaced a distance from the top of the ceramic temperature control unit C31 in the horizontal pull box, ensuring that the high internal temperature does not affect the temperature above. A heat insulation plate C35 is also installed between the top of the ceramic temperature control unit C31 and the mounting base plate C34. The distance between the heat insulation plate C35 and the top of the ceramic temperature control unit C31 is greater than the distance between the heat insulation plate C35 and the mounting base plate C34. This heat insulation plate allows heat to be better retained within the temperature control module.

[0072] In this embodiment, the temperature measuring device is a temperature sensor C36, whose probe C361 passes through the top of the temperature control module, the heat insulation plate C35, and the mounting base plate C34, and is located above the film to measure the temperature more accurately.

[0073] In addition, to improve the insulation and heating effects of the temperature control module C3, based on the principle of thermal radiation, a side steel plate C37 is installed inside the side wall of each temperature control module C3. This side steel plate C37 is a detachable structure. With the support of the side steel plates on both sides, the heat can be better maintained at the film position, resulting in better insulation and heating effects for the entire horizontal pull box, as well as energy saving, meeting the requirements of energy conservation and emission reduction.

[0074] As shown in Figure 8, the top of the edge steel plate C37 has an acute-angle bending groove C371, and the top of the ceramic temperature control unit C31 of the horizontal pull box has a reverse bending groove C372 corresponding to the acute-angle bending groove C371. The acute-angle bending groove C371 and the reverse bending groove C372 hook each other, thereby suspending and fixing the edge steel plate C37. This solution adopts the simplest design, making the installation and disassembly of the steel plate very convenient, and also facilitating maintenance and replacement without increasing additional costs.

[0075] The horizontal pull box unit C100 has several side operation doors C5 on at least one side. These side operation doors are mainly used for routine operations such as clamping, tensioning, or rolling the internal film. During operation, the corresponding edge steel plate C37 must be removed; therefore, the edge steel plate is designed with the simple structure described above for ease of operation. A transparent observation window can be fixed to the side operation door C5 for easy observation of the internal process conditions during operation. The design of multiple side operation doors also facilitates rapid cooling after shutdown. The use of multiple temperature control modules significantly reduces the overall height of the box. Due to the edge insulation measures, such as edge steel plates or independently installed edge heating devices, the access and space of the side operation doors are limited, preventing them from fully functioning as maintenance doors. The horizontal pull box unit, which uses a temperature control module composed of far-infrared ceramic heating plates, has several maintenance openings on the bottom plate of the horizontal pull box unit C100. Each maintenance opening has a bottom maintenance door C6 that can be opened and sealed. The horizontal pull box unit C100 is equipped with pulleys C7 or slide rails to prevent the box from deforming due to thermal expansion.

[0076] Please refer to Figures 10 and 11. The hot air heating subunit C2 in this embodiment is also equipped with a film inlet and a film outlet. It includes an upper blowing platform C51 and a lower blowing platform C52, with a passage space C53 formed between the upper and lower blowing platforms through which the film passes. The upper and lower blowing platforms are connected to a hot air supply section C54. The overall design concept is to simultaneously blow hot air onto the film from both above and below during film transport to control the temperature. In addition, the airflow control can also support the film during transport.

[0077] In this embodiment, the upper blowing platform C51 and the lower blowing platform C52 are respectively provided with several blowing toothed platforms C55, and the blowing toothed platforms C55 are provided with transverse air outlet slits C56. The length of the air outlet slit matches the width of the film through which it passes. This allows for more uniform and comprehensive heating and blowing of the film, as well as support of the film.

[0078] Ideally, all the blower teeth should have the same width, and the gaps between them should also be the same width. This ensures more uniform airflow, and the upper and lower air outlet positions are perfectly aligned. The blower teeth can be set very closely together; the density and number of teeth can be set according to requirements, which can be chosen by those skilled in the art.

[0079] In addition, the hot air supply section C54 includes a fan C57. One end of the fan C57 is connected to an electric heating device C58 via a pipe, and the other end is connected to the upper air blowing platform C51 and the lower air blowing platform C52 to supply hot air. The other end of the electric heating device C58, connected to the fan C57, is connected to a hot air recovery port C59 via a pipe. This hot air recovery port C59 is located above the upper air blowing platform C51. Since hot air generally flows upward, this arrangement is more conducive to hot air recovery. Utilizing this circulation structure allows for the recycling of hot air, making it more energy-efficient and environmentally friendly, reducing power consumption, and improving economic benefits.

[0080] As shown in Figure 9, a horizontal negative pressure air curtain device C4 is provided at the inlet and outlet of the horizontal box unit C100. The horizontal negative pressure air curtain device C4 includes a first exhaust section C41 and a second exhaust section C42 of the horizontal negative pressure air curtain arranged opposite each other. At least one flow equalization plate is provided in the first exhaust section C41 and / or the second exhaust section C42 of the horizontal negative pressure air curtain. A channel space is formed between the first exhaust section C41 and the second exhaust section C42 of the horizontal negative pressure air curtain. The width of the channel space is adapted to the width of the membrane. The flow equalization plate has a number of air holes or a number of slit holes.

[0081] Please refer to Figures 12 to 15. The preferred embodiment of the present invention is an amplitude adjustment device for a horizontal stretching machine, which solves the problem that existing solutions may fail due to heat deformation. It achieves synchronous control and easy adjustment while better adapting to temperature changes and improving the stability of equipment operation.

[0082] The transverse stretching machine C includes an amplitude adjustment device to control the film stretching amplitude. The amplitude adjustment device includes a transverse stretching frame C62 and two laterally distributed and independently arranged guide rail fixing seats C61. Each guide rail fixing seat C61 is slidably mounted on the transverse stretching frame C62 and can slide left and right. Each guide rail fixing seat C61 is connected to an amplitude adjustment mechanism; each amplitude adjustment mechanism independently drives the movement of its guide rail fixing seat C61, or they are connected through a synchronization mechanism to synchronously drive the movement of both guide rail fixing seats C61.

[0083] The amplitude adjustment mechanism can be a mechanical structure such as a ball screw or screw nut, or an electrically controlled telescopic rod, cylinder, or hydraulic cylinder; the synchronization mechanism can be a synchronous shaft drive structure or a control system (cables, pipelines, solenoid valves). The amplitude adjustment device is located inside the insulation box of the horizontal stretching machine. It is at room temperature during equipment installation or maintenance, but will be in a high-temperature environment during operation. This temperature difference will cause thermal expansion and deformation of the metal structure. In existing solutions, because the two guide rail fixing seats are directly connected by rods, they have very little deformable space. The structure at one end (such as the ball screw) may be deformed under pressure due to thermal expansion, leading to damage. This solution separates the amplitude adjustment mechanisms of the two guide rail fixing seats C61 independently, effectively avoiding the above problems.

[0084] In a preferred embodiment, the amplitude adjustment mechanism includes an amplitude adjustment lead screw C67 connected to the guide rail fixing seat C61 and an amplitude adjustment nut C68 connected to the amplitude adjustment lead screw C67. The amplitude adjustment lead screw C67 and the amplitude adjustment nut C68 form a lead screw and nut transmission mechanism (hereinafter referred to as the lead screw mechanism). The amplitude adjustment nut C68 is connected to a drive control device. For example, the amplitude adjustment nut C68 is connected to a motor via a chain drive, thereby converting the rotation output by the motor into the distance of extension and retraction of the amplitude adjustment lead screw C67, thus adjusting and controlling the position of the guide rail fixing seat C61.

[0085] Furthermore, the transverse tensioning frame C62 includes a transversely arranged amplitude adjustment track frame C64. The amplitude adjustment track frame C64 is a hollow support structure. The synchronization mechanism of the amplitude adjustment mechanism and / or the amplitude adjustment nut C68 and / or the amplitude adjustment lead screw C67 are disposed in the hollow part inside the amplitude adjustment track frame C64, thereby isolating the mechanical transmission components from the high-temperature working environment. For example, in a preferred embodiment, the amplitude adjustment lead screw C67 and the synchronization mechanism of the amplitude adjustment mechanism are arranged horizontally and vertically in parallel (both are arranged horizontally and are arranged one above the other in parallel), and the synchronization mechanism is disposed inside the amplitude adjustment track frame C64.

[0086] The transverse stretching machine has an insulated box. Two guide rail fixing seats C61 (and the guide rails on the guide rail fixing seats C61, the amplitude adjustment track frame C64, etc.) are all located inside the insulated box. The film is heated and stretched while being conveyed and moved within the insulated box. The outer wall of the insulated box is an insulation layer structure, which includes an inner wall panel C65, an outer wall panel C618, and a hollow cavity between the inner wall panel C65 and the outer wall panel C618. The inner side of the inner wall panel C65 and / or the outer wall panel C618 is, for example, a steel plate with an attached thermal insulation board. The hollow cavity can be further filled with thermal insulation cotton or similar insulation structures, thus ensuring structural strength while providing the required thermal insulation effect. The amplitude adjustment nut C68 is located within the hollow cavity of the insulation layer structure or outside the insulated box to prevent the threaded fit of the screw nut transmission mechanism from failing due to thermal deformation.

[0087] Preferably, the horizontal tensioning frame C62 is provided with two amplitude adjustment tracks C63. The two amplitude adjustment tracks C63 are independent and spaced apart. Two guide rail fixing seats C61 are slidably connected to the two amplitude adjustment tracks C63 respectively. The basic structure of the guide rail fixing seats and amplitude adjustment tracks can follow existing technical solutions or adopt other feasible solutions, which will not be elaborated here. In this solution, the amplitude adjustment track C63 is also segmented. Compared with the single track in the prior art, this avoids the problem of the amplitude adjustment track C63 being deformed by thermal expansion, thus affecting the amplitude adjustment function.

[0088] More specifically, in a preferred embodiment, the synchronization mechanism (at least a portion of it) of the amplitude modulation mechanism is located inside the amplitude modulation track frame C64, and the amplitude modulation track C63 is located on the outer surface (e.g., above) of the amplitude modulation track frame C64. Since the amplitude modulation track frame C64 isolates the high-temperature environment inside the insulation box of the horizontal pulling machine from the environment inside the amplitude modulation track frame C64, it can insulate some of the heat (or a heat insulation layer can be considered inside the amplitude modulation track frame C64 for further heat insulation), making the temperature inside the amplitude modulation track frame C64 lower than the high temperature outside, which is beneficial to the operation of the synchronization mechanism; for example, the portion of the synchronization mechanism located inside the amplitude modulation track frame C64 is a cable, or the amplitude modulation synchronization shaft C66 in the illustrated specific embodiment, etc. Reducing the temperature difference can avoid significant thermal deformation of the structure, and also helps to improve the service life of the circuit control method. The amplitude modulation track frame C64 (horizontal pulling machine frame C62) has a fixed column structure at the bottom, for example, by bolts, for support and positioning. This fixed column structure can be optionally extended to the outside of the insulation box at its lower end.

[0089] The amplitude adjustment mechanism is preferably a screw mechanism (e.g., a ball screw mechanism). The screw mechanism mainly includes an amplitude adjustment screw C67 and an amplitude adjustment nut C68 that is threadedly fitted onto the outside of the amplitude adjustment screw C67. It also includes a positioning spacer C69, which is, for example, cylindrical. The amplitude adjustment screw C67 is connected and fixed to the inner wall plate C65 via the positioning spacer C69, which is fitted onto the amplitude adjustment screw C67. More specifically, the positioning spacer C69 is fixedly connected to the inner wall plate C65 via, for example, a flange or bolt structure, while the amplitude adjustment screw C67 and the positioning spacer C69 are slidably connected. The positioning spacer C69 is fitted onto the outer end of the amplitude adjustment screw C67, and the inner end of the amplitude adjustment screw C67 is connected to the guide rail fixing seat C61. Wear-resistant and high-temperature-resistant inner rings are provided at both ends inside the positioning partition C69, and are fitted onto the amplitude adjusting screw C67. The wear-resistant and high-temperature-resistant inner rings include a wear-resistant sleeve C691 and a partition sleeve C692. The wear-resistant sleeve C691 is located at the end of the positioning partition C69 closer to the guide rail fixing seat C61, and is preferably, for example, a brass sleeve with high-temperature resistance. The partition sleeve C692 is located at the end of the positioning partition C69 away from the guide rail fixing seat C61, and is preferably, for example, a polytetrafluoroethylene washer with wear-resistant and high-temperature-resistant properties.

[0090] The amplitude adjusting nut C68 and the amplitude adjusting screw C67 are threaded together on the outside, so that as the amplitude adjusting nut C68 rotates, the amplitude adjusting screw C67 and the guide rail fixing seat C61 will move laterally. The threads of the two amplitude adjusting screws C67 of the two guide rail fixing seats C61 are opposite, so when the two amplitude adjusting nuts C68 rotate synchronously in the same direction, the two guide rail fixing seats C61 will move towards or away from each other simultaneously.

[0091] For example, the guide rail fixing seat C61 is connected to the amplitude adjusting screw C67 by installing a baffle on the side of the guide rail fixing seat C61. The baffle has an L-shaped cross-section, and a space is formed between the baffle and the side of the guide rail fixing seat C61 to accommodate the head of a screw. The shank of the screw is connected to the amplitude adjusting screw C67. Depending on the actual needs and the specific setting of the screw mechanism, the guide rail fixing seat C61 and the amplitude adjusting screw C67 can be fixed, or a rotatable connection can be achieved through the cooperation between the screw head and the baffle (or a bearing can be further provided for rotatable connection), so as to cooperate with the screw mechanism to achieve the function or increase the flexibility of the structure.

[0092] Preferably, the synchronization mechanism adopts a mechanical transmission method, including a transversely arranged amplitude-adjusting synchronization shaft C66. Both ends of the amplitude-adjusting synchronization shaft C66 are rotatably connected to the inner wall plate C65 via, for example, bearings. Both ends of the amplitude-adjusting synchronization shaft C66 are respectively connected to two amplitude-adjusting mechanisms. The amplitude-adjusting synchronization shaft C66 is located inside an amplitude-adjusting track frame C64, which has a hollow tubular structure. Preferably, both ends of the amplitude-adjusting track frame C64 are connected to the inner wall plate C65, thereby essentially isolating the amplitude-adjusting synchronization shaft C66 from the internal structure of the insulation box. An amplitude-adjusting drive sprocket C610 is sleeved and connected to both ends of the amplitude-adjusting synchronization shaft C66. An amplitude-adjusting nut C68 is rotatably connected to the inner wall plate C65 via bearings. An amplitude-adjusting driven sprocket C611 is coaxially connected to the amplitude-adjusting nut C68. An amplitude-adjusting drive chain C612 is rotatably connected between the amplitude-adjusting drive sprocket C610 and the amplitude-adjusting driven sprocket C611. The amplitude modulation synchronous shaft C66 is connected to the drive control equipment, such as the amplitude modulation drive motor C613 and / or the amplitude modulation handwheel C614. The amplitude modulation synchronous shaft C66 rotates as the driving element, thereby driving the two amplitude modulation passive sprockets C611 at both ends to rotate. This synchronous transmission method has high synchronization effect and transmission efficiency. Furthermore, the two amplitude modulation nuts C68 on both sides rotate simultaneously. Because the inner end of the amplitude modulation screw C67 is rotatably connected to the guide rail fixing seat C61, and the guide rail fixing seat C61 is slidably connected to the horizontal tension frame C62, the amplitude modulation screw C67 is restricted from free rotation. Instead, it translates with the rotation of the amplitude modulation nuts C68 under the threaded engagement, thus driving the guide rail fixing seat C61 to translate as well.

[0093] The amplitude modulation synchronous shaft C66, amplitude modulation lead screw C67, and amplitude modulation track C63 are parallel and horizontally arranged, resulting in a clear and neat overall structure. It is conceivable that, due to the use of chain and sprocket transmission, it can withstand a certain degree of tilting and offset; the amplitude modulation track C63 could be arranged obliquely as needed, etc. These easily conceivable variations do not depart from the concept of this utility model.

[0094] Preferably, the drive control device connected to one end of the amplitude modulation synchronous shaft C66 further includes a gearbox C617. The gearbox C617 has two input terminals: one connected to the amplitude modulation drive motor C613 and the other connected to the amplitude modulation handwheel C614. The output terminal of the gearbox C617 is the output shaft of the drive control device connected to the amplitude modulation synchronous shaft C66, thus allowing for motor control or manual fine-tuning via the handwheel. More preferably, the amplitude modulation synchronous shaft C66 is also connected to a position display device C615 and / or an automatic control device C616. The position display device C615 includes, for example, a sensor and a display, capable of digitally displaying the position information of the guide rail fixing seat for viewing during adjustment. The automatic control device C616 is connected to the gearbox C617 or the amplitude modulation drive motor C613, enabling remote control via wired or wireless means. The amplitude adjustment drive motor C613, amplitude adjustment handwheel C614, position display device C615, and automatic control device C616 are linked together. Electric, manual, or remote control adjustments will affect the actual data displayed by the position display device C615. The information from the position display device C615 can be obtained by the remote end, thus enabling a flexible adjustment mode with automatic as the main method and manual as the auxiliary method, ensuring the accuracy of the horizontal pulling amplitude.

[0095] In existing technical solutions, the drive control equipment, related bearings and other components, as well as the threaded connection between the lead screw and nut, are located inside the insulation box. Prolonged operation at high temperatures is detrimental to the service life of these mechanical structures, especially for threaded connections, where thermal deformation can lead to functional failure. While increasing the thread tolerance between the thread and the lead screw can accommodate high-temperature areas, this would result in decreased accuracy. In this solution, the side wall of the insulation box preferably has an insulation layer structure. The adjusting nut of the lead screw mechanism and the drive control equipment are located within or outside the insulation layer structure. The threaded engagement portion of the lead screw mechanism is isolated from the high-temperature environment inside the box, reducing the operating temperature by more than 100°C, thus avoiding the aforementioned problems caused by high temperatures. The chain, sprocket, and other structures are also located within the insulation layer structure. The drive control equipment is located outside the lead screw mechanism, preferably outside the insulation box, effectively improving its service life and allowing for better integration of electronic components for automatic / remote control.

[0096] The second aspect of the present invention relates to an improvement to the stripping chamber, which is mainly aimed at solving the problem of poor film quality after processing by existing technical solutions. It aims to achieve a more suitable conveying method for wet films through the improvement of the roller system, so as to better meet the current high-end process requirements for film surface quality and uniformity.

[0097] Please refer to Figures 16 to 26. The upstream side of the peeling chamber is sealed to the casting machine. A peeling roller is located between the casting machine and the peeling chamber. After casting, the film, having partially evaporated solvent and partially hardened, is peeled off from the steel belt at the active drum of the casting machine by peeling roller B6 on the side near the peeling chamber. It then enters the peeling chamber for further solvent discharge and longitudinal stretching. Downstream of the peeling chamber is a cross-stretcher, where the film is further heated and stretched laterally. Downstream of the peeling chamber is a clamping adjustment mechanism used to adjust the angle of the cross-stretcher chain clamp (clamping the film edge). The relevant basic processes and structures are existing technology and will not be described in detail here.

[0098] The peeling chamber B is a sealed box structure with at least a film inlet, an outlet, and a ventilation system. Inside the peeling chamber is the multi-roller system for peeling the cast film according to this invention. The film peeled from the casting machine enters the film inlet and undergoes tension control and stretching during its transport within the peeling chamber. Simultaneously, solvent evaporates from the film, and the solvent gas is discharged from the peeling chamber through the ventilation system for collection and treatment. The peeling chamber is isolated from the outside environment to prevent solvent gas escape that could lead to explosions or harm to workers' health.

[0099] In order to improve the isolation effect of gases and temperatures in the stripping chamber, a stripping negative pressure air curtain device B7 is installed at the film inlet of the stripping chamber. The stripping negative pressure air curtain device B7 includes a first stripping negative pressure air curtain exhaust section B71 and a second stripping negative pressure air curtain exhaust section B72 arranged opposite to each other. At least one stripping negative pressure air curtain flow equalization plate B73 is provided in the first stripping negative pressure air curtain exhaust section B71 and / or the second stripping negative pressure air curtain exhaust section B72. The first stripping negative pressure air curtain exhaust section B71 and the second stripping negative pressure air curtain exhaust section B72 are located on the upper and lower sides of the film conveying path, respectively. A stripping negative pressure air curtain channel space B74 for the film to pass through is formed between the first stripping negative pressure air curtain exhaust section B71 and the second stripping negative pressure air curtain exhaust section B72. The width of the stripping negative pressure air curtain channel space B74 is adapted to the width of the film.

[0100] It should be noted that the "opposite" of the first exhaust section B71 and the second exhaust section B72 of the stripped negative pressure air curtain refers to the opposite of the exhaust ports. In other words, both have through holes (which can be called air vents) on their inner sides for air to pass through. The air vents can be directly opened on the exhaust section (such as the bellows) or located on the flow equalization plate. To ensure the effectiveness of the negative pressure air curtain, this solution specifies that at least one exhaust section uses the stripped negative pressure air curtain flow equalization plate B73. The stripped negative pressure air curtain flow equalization plate B73 can be selected as one piece, or multiple pieces, or a multi-layer structure. The dimensions of the stripped negative pressure air curtain channel space B74 are adapted to the film, which better ensures the formation of a relatively sealed partition on both sides of the negative pressure air curtain device. Specifically, the width covers the film and is generally greater than or equal to the width.

[0101] During operation, the first and second exhaust sections B71 and B72 of the negative pressure air curtain are used for simultaneous air extraction. The airflow equalization plate B73 ensures uniform airflow velocity; without it, airflow velocity would be higher closer to the exhaust section (e.g., in the exhaust duct) and less effective extraction further away. The channel space B74 of the negative pressure air curtain allows the film being transported in the process equipment to pass through without being subjected to strong airflow impact. Airflow in the two spaces separated by the negative pressure air curtain is drawn away by the first and second exhaust sections B71 and B72 upon reaching the vicinity of the negative pressure air curtain device, preventing airflow from one space from entering the next, and vice versa. This ensures relative environmental independence between adjacent spaces while maintaining effective ventilation within the equipment. In this solution, the stripping negative pressure air curtain device B7 is set up on the basis of the existing or required ventilation system. In other words, the stripping negative pressure air curtain device B7 is mainly used to form an air curtain at the entrance, while the work of providing air flow inside the stripping room and timely discharge of solvent still mainly relies on the ventilation system.

[0102] Preferably, the inlet and / or outlet of the negative pressure air curtain channel space B74 has an adjustable baffle mechanism (or partition) adapted to the film thickness. The partition is used to further reduce the inlet / outlet to near the film thickness, thereby better separating the two spaces before and after the negative pressure air curtain device and preventing the inlet / outlet from being too large and allowing gas to escape. For example, the partition includes at least one negative pressure air curtain slit baffle B76 located on the first exhaust section B71 and / or the second exhaust section B72 of the negative pressure air curtain. The negative pressure air curtain slit baffle B76 is two upper and lower baffles that are sealed and fixed on the outside. The negative pressure air curtain slit baffle B76 forms a slit at the inlet and / or outlet of the negative pressure air curtain channel space B74, and the size of the slit is smaller than the negative pressure air curtain channel space B74. The distance between the first exhaust section B71 and the second exhaust section B72 of the stripping negative pressure air curtain should not be too close. Therefore, the size of the inlet and / or outlet of the stripping negative pressure air curtain channel space B74 can be further defined by the stripping negative pressure air curtain slit baffle B76, and preferably the position and size of the slit are adjustable (e.g., formed by two removable / adjustable baffles). More specifically, for example, the slit is located in a central position between the first exhaust section B71 and the second exhaust section B72 of the stripping negative pressure air curtain, so that the distance between the film and the first exhaust section B71 and the second exhaust section B72 of the stripping negative pressure air curtain is substantially the same. The stripping negative pressure air curtain slit baffle B76 allows a thinner film to pass through while preventing gas from escaping from the stripping chamber. It is conceivable that in other feasible embodiments, the partition is a plate with a slit, or a pipe-like structure, or further provided with a flow guiding / filtering structure, etc., all of which are intended to serve as partitions and do not depart from the concept of this solution.

[0103] Preferably, it further includes stripping negative pressure air curtain channel side plates B75 disposed on the outer sides of the first exhaust section B71 and the second exhaust section B72 of the stripping negative pressure air curtain. The stripping negative pressure air curtain channel side plates B75, together with the stripping negative pressure air curtain flow equalization plates B73 of the first exhaust section B71 and the second exhaust section B72 of the stripping negative pressure air curtain, form the four side walls of the stripping negative pressure air curtain channel space B74. In practical applications, the position and size of the stripping negative pressure air curtain channel space B74 are not larger than the connection opening between the front and rear spaces, and are sealed with the connection opening to ensure that the airflow at the connection opening can only flow to the first exhaust section B71 and the second exhaust section B72 of the stripping negative pressure air curtain, and cannot escape from other places around the connection opening. It is understandable that for cases where the process space (stripping chamber) is small or the first exhaust section B71 and the second exhaust section B72 of the stripping negative pressure air curtain are large, the side wall of the process space can be equivalent to the side wall of the channel space, which can effectively achieve the required effect. In this case, it is not necessary to set up the stripping negative pressure air curtain channel side plate B75 (and other structures that restrict the connection port).

[0104] In some embodiments, both the first exhaust section B71 and the second exhaust section B72 of the stripping negative pressure air curtain are strip-shaped to adapt to the width of the space connection opening (film inlet); the flow equalization plate B73 of the stripping negative pressure air curtain is a porous strip-shaped flat plate, and the flow equalization plate B73 of the first exhaust section B71 and the second exhaust section B72 of the stripping negative pressure air curtain is parallel to each other. This solution is small in size while achieving the required functions, which is convenient for production and use; the air curtain device should not be too large, so as not to affect the operation of the main ventilation system. In addition, if the air curtain device is too large, it will affect the overall size of the equipment box, resulting in increased costs and poor thermal insulation. For example, the first exhaust section B71 and the second exhaust section B72 of the stripping negative pressure air curtain are arranged vertically to adapt to the laterally conveyed film.

[0105] More specifically, the negative pressure air curtain stripping device includes a first airtight air box B77 and a second airtight air box B78. The first airtight air box B77 is connected to a first exhaust pipe B79, and a first exhaust section B71 is formed on the side of the first airtight air box B77 facing the second airtight air box B78. The second airtight air box B78 is connected to a second exhaust pipe B710, and a second exhaust section B72 is formed on the side of the second airtight air box B78 facing the first airtight air box B77. The airflow equalization plate B73 of the negative pressure air curtain is matched with the first airtight air box B77 and the second airtight air box B78 to ensure airflow uniformity. The side plate B75 of the stripping negative pressure air curtain channel and the slit baffle B76 of the stripping negative pressure air curtain (if present) are installed on the first airtight air box B77 and the second airtight air box B78 of the stripping negative pressure air curtain. Preferably, the first exhaust pipe B79 of the stripping negative pressure air curtain is provided on both sides of the first airtight air box B77, and the second exhaust pipe B710 of the stripping negative pressure air curtain is provided on both sides of the second airtight air box B78; this method of connecting exhaust pipes on both sides helps to make the airflow uniform at all points of the stripping negative pressure air curtain flow equalization plate B73.

[0106] Furthermore, a wind speed acquisition device B711 (such as an anemometer) is provided at the airflow equalization plate B73 of the negative pressure air curtain. A wind speed adjustment mechanism B712 (such as a speed-regulating fan, or an independent air-regulating valve, etc.) is connected to the outside of the first exhaust section B71 and / or the second exhaust section B72 of the negative pressure air curtain via exhaust ducts, thereby enabling wind speed monitoring and adjustment. Specifically, the first exhaust section B71 and / or the second exhaust section B72 of the negative pressure air curtain are connected to exhaust ducts, which include, for example, a first exhaust pipe B79 and a second exhaust pipe B710. The wind speed adjustment mechanism B712 is located at the outer end of the exhaust ducts. Preferably, the wind speed acquisition device B711 is also electrically connected to the wind speed adjustment mechanism B712, enabling signal transmission and thus achieving automatic adjustment and control based on wind speed. More specifically, the ends of the first exhaust pipe B79 and the second exhaust pipe B710 of the stripped negative pressure air curtain converge into a single pipe and are connected to a stripped negative pressure air curtain wind speed adjustment mechanism B712, or the first exhaust pipe B79 and the second exhaust pipe B710 of the stripped negative pressure air curtain are respectively connected to their respective wind speed adjustment mechanisms.

[0107] Preferably, the air equalization plates B73 inside the first exhaust section B71 and / or the second exhaust section B72 of the negative pressure air curtain are multi-layered, which can improve the air equalization effect. The multi-layered air equalization plates B73 are arranged parallel to or inclined along the film conveying direction; for example, in the embodiment shown in Figure 18, the air equalization plates B73 are two layers arranged parallel (laterally) along the film conveying direction; in other embodiments, the air equalization plates are not parallel to the film conveying direction but at a certain angle, i.e., inclined. The air equalization plates B73 have several air holes or several slits, and the air holes or slits in each layer are arranged oppositely or staggered. Relative arrangement means that the air holes are corresponding in the wind speed direction, and the line connecting several corresponding air holes is consistent with the wind speed direction; staggered arrangement means that the air holes are staggered in the wind speed direction. In some embodiments, the air vents are, for example, small holes, closely arranged on the stripped negative pressure air curtain equalization plate B73; in other embodiments, the air vents are arranged strip-shaped holes, or the stripped negative pressure air curtain equalization plate B73 is in the form of a grid or mesh; or it is a combination of multiple hole types; the slit hole is a long and narrow slit-shaped hole, for example, one or more slit holes, and the length direction of the slit hole is, for example, parallel to the width direction of the film or inclined at a certain angle.

[0108] Furthermore, the shell wall of the stripping chamber is provided with an air curtain outlet, and the ends of the first exhaust pipe B79 and the second exhaust pipe B710 of the stripping negative pressure air curtain are sealed to the air outlet of the sealed shell. The specific arrangement of the exhaust pipes can be designed according to the situation, for example, connecting to the air outlets on the top or side wall of the shell. The first exhaust pipe B79 and the second exhaust pipe B710 of the stripping negative pressure air curtain are also provided with, for example, an exhaust gas treatment system at the rear end of the fan. In some embodiments, the ventilation system also includes a rear air supply box, which is located at the bottom of the rear end inside the stripping chamber to exhaust air from dead corners. The rear air supply box is connected to the outside of the stripping chamber through a pipeline and converges with the pipeline of the stripping negative pressure air curtain device B7 into a single pipeline. The specific arrangement of the ventilation system other than the negative pressure air curtain device can be selected as needed and is not the focus of this improvement, so it will not be elaborated here.

[0109] It should be noted that existing air curtain devices generally form an air curtain by blowing out a strong airflow, and are usually not set up opposite each other on both sides. Furthermore, they cannot be used in the stripping chamber. The film is a wet film with a high solvent content, and a strong airflow cannot impact the film surface, otherwise it will affect the film quality. Therefore, the existing stripping chamber does not have an air curtain and is a directly connected structure. Although there is a ventilation system to provide negative pressure, gas can still escape. This negative pressure air curtain device can be optionally installed at the input end of the equipment housing. It can isolate and divide different process environment areas, such as temperature zones, thereby meeting various complex process requirements. Simultaneously, the presence of the negative pressure air curtain can also create local transition zones between process environment areas, avoiding problems such as sudden temperature changes in the film after entering a certain area. This negative pressure air curtain device uses two oppositely positioned exhaust units to simultaneously draw air, each equipped with a flow equalization plate to ensure uniform airflow intensity. A negative pressure air curtain is formed in the channel space between the two exhaust units. The film can be transferred between the two spaces through this channel space. Because of the negative pressure air curtain between these two spaces, problems such as temperature and gas mutual influence (e.g., escape / cross-contamination of gases with different temperatures and compositions) are avoided, effectively ensuring the accuracy and stability of process environment control for high-end processes. It is understood that negative pressure air curtain devices with the same or similar structures can also be used in casting machines and cross-stretching machines.

[0110] Referring to Figures 16 and 21 to 26, a multi-roller system according to an embodiment of the present invention includes a guide roller B1, a traction roller B2, and a gravity roller B3 disposed on a multi-roller system frame. Typically, each roller is horizontally arranged and relatively long to match the film width. Furthermore, both ends of each roller are directly or indirectly connected to the multi-roller system frame in the length direction to ensure stability. The axis of the roller is fixed or floating, and the roller can rotate around its axis. The basic structure of the rollers and the frame is prior art and will not be described in detail here.

[0111] Guide roller B1 is a driven roller, fixedly mounted on the frame of the multi-roller system. Typically, multiple rollers are distributed from the input to the output. The film is traction-provided by the driving roller in the multi-roller system. The film adheres to guide roller B1, which is passively rotated by the film, thus conveying the film along a predetermined path. More specifically, both ends of guide roller B1 are connected to the frame via a guide roller fine-tuning mechanism, allowing adjustment to ensure that the two ends of guide roller B1 are flush and that all rollers are parallel.

[0112] The traction roller B2 is located downstream of the peeling roller B6, and one or more (six in the figure) guide rollers B1 are spaced between the traction roller B2 and the peeling roller B6. The traction roller B2 includes two adjacent active rollers, and the film conveying path at the traction roller B2 has an S-shaped structure. Specifically, for example, of the two active rollers of the traction roller B2, the upstream roller is located diagonally above the downstream roller, so that the S-shaped film at the traction roller B2 in the middle of a row of guide rollers B1 has a large wrap angle; in addition, since both traction rollers B2 are active rollers, a tension isolation effect is achieved, that is, the tension conditions on the upstream and downstream sides of the traction roller B2 are independent. In the structure shown in Figure 16, the peeling roller B6 and the traction roller B2 are active rollers, and the rest are driven rollers (except for the active drum of the steel strip casting machine on the far left in the figure, which is not included in the multi-roller system).

[0113] It should be noted that existing multi-roller systems generally use a traction roller plus a pressure roller to achieve tension isolation. However, for the cast film peeling chamber, the film is a wet film containing a lot of solvent. If the pressure roller is used, it will cause embossing and affect the film thickness. However, the special traction roller structure designed in this invention can avoid the problem of deformation under pressure.

[0114] In some embodiments, at least three (e.g., four to six) guide rollers B1 are arranged between the traction roller B2 and the peeling roller B6 to form a cooling conveying section. The cooling conveying section, formed by these guide rollers B1, has a predetermined length and serves to reduce the temperature of the film after conveying to, for example, 30°C to 40°C. The arrangement of the guide rollers B1 must also ensure the wrap angle, for example, approximately 30°. The arrangement, number, and spacing of the guide rollers B1 are determined based on the angle requirements. More specifically, the peeling chamber (especially above the cooling conveying section) has an air supply mechanism to introduce clean air, for example, at room temperature, into the peeling chamber to maintain the required low temperature in the cooling conveying section.

[0115] Gravity roller B3 is located downstream of traction roller B2, and one or more guide rollers B1 (one shown in the figure) are spaced between gravity roller B3 and traction roller B2. Gravity roller B3 is a driven roller, and its upstream and downstream sides are adjacent to a guide roller B1. The height of gravity roller B3 is lower than that of the guide rollers B1 on both sides, and the position of gravity roller B3 is movable. The function of gravity roller B3 is to adjust tension and perform micro-longitudinal stretching. Its main principle is to provide constant tension through gravity or other means. When gravity roller B3 is vertically movable, it pulls and stretches the film downward with constant tension; and this constant tension is adjustable.

[0116] The gravity roller assembly includes a gravity roller B3 and a gravity roller counterweight mechanism B38. The gravity roller B3 and the gravity roller counterweight mechanism B38 are mounted on the same closed chain, or they can be mounted on two separate closed chains via a synchronous transmission mechanism (in other words, the gravity roller B3 and the gravity roller counterweight mechanism B38 can be mounted on different closed chains with a larger spatial distance, while still maintaining synchronous transmission). The closed chain is a ring chain that can rotate along the ring path. The closed chain forms a structure similar to a fixed pulley (or a lever structure). Therefore, the gravity roller B3 and the gravity roller counterweight mechanism B38 can be located on the same side or opposite sides of the lever structure's fulcrum.

[0117] When gravity roller B3 and gravity roller counterweight mechanism B38 are located on the upper and lower sides of the closed chain, respectively, the sum of the film tension F and the counterweight pulling force G1 of the gravity roller counterweight mechanism is balanced with the gravity force G2 of the gravity roller. That is, the resultant force of the system = F + G1 - G2 = 0, therefore F = G2 - G1. When gravity roller B3 and gravity roller counterweight mechanism B38 are located on the same side of the closed chain, the sum of the counterweight pulling force G1 and the gravity force G2 of the gravity roller is balanced with the film tension F. That is, the resultant force of the system = F - G1 - G2 = 0, therefore F = G1 + G2.

[0118] In a preferred embodiment, the closed chain includes a roller chain B33 and a counterweight chain B37. A gravity roller B3 and a gravity roller counterweight mechanism B38 are respectively mounted on the roller chain B33 and the counterweight chain B37. The roller chain B33 is a vertically arranged ring, and is drivenly connected to roller sprockets B32 located at its upper and lower ends. A floating block B34 is connected to the roller chain B33, and the gravity roller B3 is rotatably connected to the floating block B34. The synchronous transmission mechanism includes a gravity roller synchronous shaft B35. A counterweight sprocket B36 is coaxially connected to the upper and / or lower roller sprockets B32 via the gravity roller synchronous shaft B35. The counterweight chain B37 is drivenly connected to the counterweight sprocket B36. The counterweight chain B37 is a vertically arranged ring, and the gravity roller counterweight mechanism B38 is connected to the counterweight chain B37.

[0119] Preferably, the system further includes a gravity roller slide rail B31 vertically mounted on the frame, with a floating block B34 slidably connected to the gravity roller slide rail B31 to limit the gravity roller B3's movement, ensuring smooth vertical movement. It is understood that the gravity roller B3 and the gravity roller counterweight mechanism B38 can be mounted on the same closed chain or on different closed chains, and the gravity roller slide rail B31 can be used for auxiliary limiting.

[0120] Specifically, in the illustrated embodiment, the gravity roller slide rail B31 is mounted on the frame of the multi-roller system. Two roller sprockets B32 are respectively located at (near) the upper and lower ends of the gravity roller slide rail B31, and are connected to a roller chain B33 for transmission. The roller chain B33 is annular and has a floating block B34 on a straight section on one side. The floating block B34 is rotatably connected to the gravity roller B3, for example, through a bearing seat, so that the gravity roller B3 can rotate around its central axis, and its central axis position can move up and down together with the floating block B34.

[0121] Preferably, only the upper roller sprocket B32 is coaxially connected to the counterweight sprocket B36 via the gravity roller synchronization shaft B35. The counterweight sprockets B36 are preferably two (a set) distributed vertically and correspondingly, with the upper counterweight sprocket corresponding to the upper roller sprocket and coaxially connected via the gravity roller synchronization shaft B35, and the lower counterweight sprocket corresponding to the lower roller sprocket. The gravity roller synchronization shaft B35 being located at the top allows it to better function as a fixed pulley and ensures that the shapes and positions of the roller chain B33 and the counterweight chain B37 correspond, contributing to more stable synchronous transmission. In other embodiments, there are gravity roller synchronization shafts B35 at both the upper and lower ends.

[0122] In this embodiment, the gravity roller counterweight mechanism B38 and the floating block B34 are located on different sides of the annular chain of counterweight chain B37 and roller chain B33. "Different sides" refers to the two straight segments (i.e., the opposing "upward side" and "downward side") in the annular chain structure. Because the required longitudinal tensile tension of the film is usually not large, the gravity roller counterweight mechanism B38 can "reduce" the weight of gravity roller B3 to achieve the desired constant tension. Of course, for cases where a larger tension is required, the gravity roller counterweight mechanism B38 can be placed on the same side of the floating block B34 and gravity roller B3.

[0123] More specifically, since the length of the gravity roller B3 is greater than the width of the film and is typically quite long, both ends of the gravity roller B3 are connected to two floating blocks B34 along its length. Furthermore, the gravity roller assembly has a mirror-symmetrical structure relative to the midpoint of its length. This mirror symmetry includes the consistency of the floating blocks B34 and the counterweight mechanism B38 on both sides (e.g., consistent mass, symmetrical position). In other words, the same and symmetrical structure is used at both ends of the gravity roller B3, ensuring consistent force and level positions, thereby enabling uniform stretching of the film. More preferably, the roller sprockets B32 on both sides (above) and the counterweight sprockets B36 (a total of four sprockets) are coaxially connected by a gravity roller synchronous shaft B35, resulting in a more stable and simpler structure.

[0124] Preferably, the counterweight chain B37 and counterweight sprocket B36 are located outside the roller chain B33 and roller sprocket B32. In specific applications, the gravity roller B3 is located within the film conveying area (such as in a closed peeling chamber). This arrangement allows the gravity roller counterweight mechanism B38 to be located on the outer side of the peeling chamber sidewall, creating an operating space that facilitates the adjustment of the gravity roller counterweight mechanism B38 by the operator.

[0125] In some embodiments, the gravity roller counterweight mechanism B38 is, for example, a weight, and the gravity applied by the gravity roller counterweight mechanism B38 can be changed by replacing the weight with one of different masses. In a preferred embodiment, the gravity roller counterweight mechanism B38 has a detachable gravity roller counterweight, which is, for example, a weight (weight), and can be installed / removed as needed to adjust the mass; or other replaceable / adjustable counterweight methods can be used.

[0126] The working principle of the gravity roller assembly in this scheme is as follows: Roller sprocket B32 and counterweight sprocket B36 can only rotate synchronously. When the gravity roller counterweight mechanism B38 moves downward, the gravity roller B3 moves upward. Initially, the weight of the gravity roller is fixed. In the initial state, the roller is at the lower end. After film stretching, under the action of tension, the roller moves upward, and the gravity roller counterweight mechanism B38 moves downward. Thus, as described in the force analysis above, it can be adjusted to the required force balance state.

[0127] Preferably, a displacement detection device is also included, which is installed on the gravity roller, the gravity roller counterweight mechanism, or the synchronous transmission mechanism; for example, the displacement detection device is located in the gravity roller assembly or on the downstream side of the gravity roller assembly. The displacement detection device is used to notify the system to adjust the rotational speed of the traction roller assembly after detecting a displacement change, thereby enabling timely feedback or automatic system adjustment to ensure the required tension effect. The displacement detection mechanism is, for example, a wire encoder B39 or a displacement sensor, which can directly or indirectly detect the displacement of the gravity roller B3. In the ideal working state of force balance, the position of the gravity roller B3 is basically stationary; however, in actual production applications, there may be sudden changes in tension, such as uneven film thickness, which causes changes in film thickness below the gravity roller B3. The constant force acting on films of different thicknesses results in different amounts of stretching, which is reflected in the up-and-down floating of the position of the gravity roller B3. The displacement detection mechanism monitors the distance of this up-and-down floating to understand the process situation, and can further enable manual adjustment or automatic system adjustment of the gravity roller counterweight mechanism B38 based on this.

[0128] More specifically, taking the wire encoder B39 as an example, the main body of the wire encoder B39 is fixedly mounted on the frame. The end of the wire of the wire encoder B39 is connected to the gravity roller counterweight mechanism B38, thereby measuring the distance the gravity roller counterweight mechanism B38 moves up and down. If the film thickness or tension is too high, the downward force provided by the gravity roller counterweight mechanism B38 is increased to control its upward movement distance; conversely, if the tension is too low, the downward force provided by the gravity roller counterweight mechanism B38 is reduced. Ideally, the roller is in the middle position, and the wire encoder B39 measures the distance, with the goal of adjusting the tension and conveying speed behind the traction roller assembly. It is understood that in other embodiments, the displacement detection device can also be a speed measuring device for measuring film speed, etc., which can indirectly reflect the displacement situation.

[0129] Preferably, the system also includes two side pressure rollers B4, which are small rollers that assist in flattening the film edges and prevent the film edges from curling. The side pressure rollers B4 are located at the two side edges of the multi-roller system; in other words, they are mounted on the frame of the multi-roller system and located at both ends of the length direction of the other rollers, corresponding to the edges of the film in the width direction. The side pressure rollers B4 are located beside the film transport path, above and / or below the film transport path, and there is a gap between the side pressure rollers B4 and the film transport path (not in contact with the ideal film transport path). Unlike other rollers, the side pressure rollers B4 are shorter, do not extend from the left frame to the right frame, and are not greater than the width of the film; they are only located on both sides of the film. More specifically, it is preferable that the left and right side pressure rollers B4 are grouped together and correspondingly located at the two side edges of the film; multiple groups of side pressure rollers B4 are arranged along the film transport path; the position of the side pressure rollers B4 is located between adjacent rollers in the multi-roller system. The two pressure rollers B4 can be positioned between rollers that are relatively far apart in the roller assembly, such as between two adjacent guide rollers B1, between the traction roller B2 and an adjacent guide roller B1, or between the gravity roller B3 and an adjacent guide roller B1, etc. The specific position can be configured as needed. The two pressure rollers B4 do not change the film transport path and do not exert pressure on the film. They are simply positioned on the side of the film transport path, do not have a driving component, and are driven rollers. When the film edge curls up, the two pressure rollers B4 can press down the curled part, helping to restore the film to the ideal position and preventing the film edge from curling up too much, which could cause folding, curling, or wrinkling.

[0130] More preferably, the two pressure rollers B4 are positionably mounted on the multi-roller system frame. For example, the two pressure rollers B4 include a pressure roller base B41, a pressure roller track frame B42, and a pressure roller positioning part B43 connected in sequence. The pressure roller positioning part B43 is rotatably connected to the pressure roller roller (i.e., the body of the two pressure rollers B4) via, for example, bearings. The pressure roller track frame B42 has a strip track, and the pressure roller positioning part B43 is adjustablely mounted on the strip track via a track locking mechanism. One end of the pressure roller track frame B42 is rotatably connected to the pressure roller base B41 in the length direction of the strip track, for example, by being sleeved on a fixed shaft, and a shaft locking mechanism is provided. The pressure roller base B41 is fixedly connected to the multi-roller system frame. Therefore, the pressure roller track frame B42 can rotate to adjust its angle, and the pressure rollers B4 on both sides can also adjust their angle along the length of the pressure roller track frame B42. This achieves an adjustable position setting for the pressure rollers B4 on both sides, making the application more flexible, reducing the precision requirements of the mounting holes on the frame, and making it easier to apply in practice. More specifically, the track locking mechanism is, for example, a screw-on nut, and the end of the pressure roller positioning part B43 is a bolt segment with a diameter smaller than the rest. This bolt segment passes through the strip track (hole) on the pressure roller track frame B42, and then a nut is installed at the end of the bolt segment to clamp and position the pressure roller positioning part B43. The shaft locking mechanism is, for example, a set screw or a damping structure. It is understood that there are many ways to set the position for adjustment, especially for the pressure rollers B4 on both sides that will not be subjected to large forces; the present invention is not limited to the solution of the above specific embodiment. Optionally, the other rollers are also installed in an adjustable position manner. Optionally, the two pressure rollers B4 are located above or below the film conveying path, or as shown in Figure 22, the two pressure rollers are mounted on the same pressure roller track frame B42, located on the upper and lower sides of the film conveying path.

[0131] Preferably, it further includes a flame-retardant roller assembly B5. Preferably, the flame-retardant roller assembly B5 is located downstream of the gravity roller assembly. The flame-retardant roller assembly B5 includes a flame-retardant pressure roller B51 and a flame-retardant guide roller B52. The conveyed film is located on the flame-retardant guide roller B52, and the flame-retardant pressure roller B51 is mounted on the balancing mechanism B53. Generally, both the flame-retardant guide roller B52 and the flame-retardant pressure roller B51 are driven rollers, not actively driven by a motor, but passively rotated under frictional force as the film is conveyed. The flame-retardant guide roller B52 is one of the guide rollers B1. The flame-retardant pressure roller B51 and the flame-retardant guide roller B52 are adjacent; for example, in the illustrated embodiment, the flame-retardant pressure roller B51 is adjacent to and above the flame-retardant guide roller B52. Under normal conditions, the flame-retardant pressure roller B51 and the flame-retardant guide roller B52 are in a non-closed state (or open state), and the flame-retardant pressure roller B51 is not in contact with the film. In the event of a fire, the balancing mechanism B53 drives the flame-retardant pressure roller B51 and the flame-retardant guide roller B52 to close, and the side of the film facing away from the flame-retardant guide roller B52 comes into contact with the flame-retardant pressure roller B51 (the side of the film facing the flame-retardant guide roller B52 comes into contact with the flame-retardant guide roller B52). Of course, the outer surfaces of the flame-retardant pressure roller B51 and the flame-retardant guide roller B52 are made of flame-retardant material, such as using existing flame-retardant rubber rollers, so that when a fire occurs, the film will be sandwiched between the flame-retardant pressure roller B51 and the flame-retardant guide roller B52, and the fire can be extinguished by the flame-retardant pressure roller B51.

[0132] This solution uses at least one guide roller in a multi-roller system as a flame-retardant guide roller B52, upon which a flame-retardant pressure roller B51 is mounted. The film is in relatively tight contact with the flame-retardant guide roller B52 for conveying, while the flame-retardant pressure roller B51 does not affect the conveying process; it is merely an additional component for fire extinguishing. This solution is particularly suitable for, for example, peeling chambers containing polyimide films, where the film is a wet film containing a significant amount of solvent. The solvent evaporating from the film forms flammable gases that may ignite on the film surface in high-temperature environments. The flame-retardant roller assembly in this solution is preferably located, for example, downstream of the multi-roller system within the peeling chamber, because the process temperature of the chamber connected downstream of the peeling chamber is typically higher. Optionally, in a fire situation, under the action of the balancing mechanism B53, the film and the flame-retardant pressure roller B51 are in near-pressureless contact. In other words, the flame-retardant pressure roller B51 is nearly in equilibrium at the point of contact with the film, thus preventing the softer film (such as a wet film) from deforming under pressure.

[0133] The flame-retardant pressure roller B51 has a flame-retardant roller central shaft and a flame-retardant roller cylinder. The flame-retardant roller cylinder is rotatably (e.g., via bearings) mounted on the flame-retardant roller central shaft, the two ends of which are fixedly connected to two balancing mechanisms B53 on both sides; or, the flame-retardant roller cylinder is fixedly connected to the flame-retardant roller central shaft, and the two ends of the central shaft are rotatably connected to the two balancing mechanisms B53 on both sides via, for example, bearings; thus, the outer surface of the flame-retardant pressure roller B51 in contact with the film can rotate. Furthermore, the flame-retardant pressure roller B51 is relatively long to accommodate wider films, and positioning at both ends of the roller ensures its stability. Similarly, the flame-retardant guide roller B52 has a flame-retardant guide roller central shaft and a flame-retardant guide roller cylinder; the flame-retardant guide roller cylinder is rotatably mounted on the flame-retardant guide roller central shaft, the two ends of which are connected to both sides of the frame; or, the flame-retardant guide roller cylinder is fixedly connected to the flame-retardant guide roller central shaft, and the two ends of the central shaft are rotatably connected to both sides of the frame.

[0134] In a preferred embodiment, the balancing mechanism B53 includes a set of swing arms B515, with a flame-retardant pressure roller B51 rotatably disposed between the swing arms B515. Specifically, both ends of the flame-retardant pressure roller B51 are connected to the two swing arms B515 via, for example, bearing seats. A fixed rotating shaft B517 and a balancing adjustment mechanism B518 are also provided on the swing arms B515. The flame-retardant pressure roller B51 is positioned on one side of the working position of the flame-retardant guide roller B52 via the fixed rotating shaft B517. The working position is the working position where the flame-retardant pressure roller B51 and the flame-retardant guide roller B52 cooperate; or more specifically, the fixed rotating shaft B517 is rotatably connected to the frame, making the flame-retardant pressure roller B51 adjacent to the flame-retardant guide roller B52, for example, the flame-retardant pressure roller B51 is located above or diagonally above the flame-retardant guide roller B52. The balance adjustment mechanism B518 is used to control the angle state of the swing arm B515, that is, the balance adjustment mechanism B518 can realize the closing and opening between the flame-retardant pressure roller B51 and the flame-retardant guide roller B52.

[0135] More specifically, the set of swing arms B515 has a pressure roller fine-tuning device B54. On each swing arm B515, the pressure roller fine-tuning device B54 includes a push rod assembly B55 and a pressure roller push rod B56 that are fixedly connected. The push rod assembly B55 is, for example, an annular bushing structure that fits onto a fixed rotating shaft B517. The push rod assembly B55 is keyed to the fixed rotating shaft B517 (for example, both the push rod assembly B55 and the fixed rotating shaft B517 have keyways, and the structure shown by the black square in Figure 25 is a key, more specifically, for example, a flat key), so that the angular position of the push rod assembly B55 and the fixed rotating shaft B517 is relatively fixed.

[0136] One of the push rod assembly B55 and the swing arm B515 is provided with one or more angle fine-tuning slots B57, and the other is provided with a bolt fixing hole (or a bolt in other ways) corresponding to the angle fine-tuning slot B57. A fine-tuning positioning bolt is connected to the bolt fixing hole and passes through the angle fine-tuning slot B57. The angle fine-tuning slot B57 is, for example, three or four slots evenly arranged around the fixed pivot B517 along the circumference (more specifically, arc-shaped slots extending in the circumferential direction). The fine-tuning positioning bolt (in the untightened state) can move in the angle fine-tuning slot B57, so that the swing arm B515 and the push rod assembly B55 are rotatably connected through the fine-tuning positioning bolt and the angle fine-tuning slot B57 (during equipment maintenance and commissioning); after the position is determined, the fine-tuning positioning bolt can be tightened to ensure a stable connection.

[0137] The pressure roller top rod B56 extends along the length of the swing arm B515, is roughly parallel to the swing arm B515, and is positioned longitudinally at the center of the swing arm B515. Angle fine-tuning screws B58 are threaded to the upper and lower sides of the pressure roller top rod B56 along its length. The angle fine-tuning screws B58 can be fixed to the swing arm B515 to fine-tune and tighten the pressure roller top rod B56. During adjustment, one end is fixed while the other end is adjusted, thereby driving the swing arm B515 to rotate, achieving the gap adjustment of the flame-retardant pressure roller B51. In other words, it is the adjustment of the relative angular position of the flame-retardant pressure roller B51 with the fixed rotating shaft B517 as the center. Specifically, the upper and lower angle fine-tuning screws B58 abut and clamp the pressure roller top rod B56 in the middle. For example, if the upper angle fine-tuning screw B58 is turned down a certain distance and the lower angle fine-tuning screw B58 is turned down a certain distance, the angle between the relatively floating swing arm B515 and the series of fixed components such as the pressure roller top rod B56, the top rod assembly B55, and the fixed rotating shaft B517 will change accordingly.

[0138] Ideally, the quadrilateral formed by the fixed rotating shaft B517, the flame-retardant pressure roller B51, and the two swing arms B515 lies in a single plane. The torsion of this quadrilateral can be adjusted by changing the angles of the swing arms B515 at both ends of the flame-retardant pressure roller B51 along its length. Furthermore, since the fixed rotating shaft B517 is connected to the fixed frame, this torsion is reflected in whether the two ends of the flame-retardant pressure roller B51 are parallel along its length. During equipment maintenance and debugging, this solution adjusts both ends of the flame-retardant pressure roller B51 by adjusting the angle fine-tuning screw B58 to ensure that the flame-retardant pressure roller B51 is parallel to the flame-retardant guide roller B52, meaning the gap between the flame-retardant pressure roller B51 and the flame-retardant guide roller B52 is uniform, preventing a situation where one end of the flame-retardant pressure roller B51 contacts the film while the other end does not.

[0139] In other embodiments, the pressure roller fine-tuning device directly adjusts the positioning position of both ends of the flame-retardant pressure roller B51. Both ends of the flame-retardant pressure roller B51 are connected to two swing arms B515 respectively. Each swing arm B515 is connected to an adjusting plate. The adjusting plate is located on the opposite side of the two swing arms B515, and the swing arms B515 and the adjusting plate are in an adjustable fixed connection. A bearing seat is fixedly connected to the adjusting plate, and the bearing seat is rotatably connected to both ends of the flame-retardant pressure roller B51.

[0140] In a preferred embodiment, the balance adjustment mechanism B518 is gravity-based and includes a counterweight B519 slidably connected to the swing arm B515. The counterweight B519 can be driven by a counterweight drive device to move towards the fixed shaft B517, thereby adjusting the center of gravity of the swing arm B515 and driving the flame-retardant pressure roller B51 and flame-retardant guide roller B52 to close. More specifically, the flame-retardant pressure roller B51 and the counterweight B519 are respectively located at both ends of the swing arm B515 (on both sides of the fixed shaft B517). For example, the fixed shaft B517 is located in the middle of the swing arm B515, the flame-retardant pressure roller B51 is located on one side of the fixed shaft B517, and the counterweight B519 is located on the other side of the fixed shaft B517. The fixed shaft B517 is connected to the frame. The closing and opening of the flame-retardant pressure roller B51 and flame-retardant guide roller B52 are achieved by adjusting the counterweight B519.

[0141] For a typical, relatively long flame-retardant pressure roller B51, a balancing mechanism B53 is provided at both ends. The balancing counterweight B519 and the fixed rotating shaft B517 are preferably rod-shaped, arranged parallel to the flame-retardant pressure roller B51, and connected to the swing arms B515 on both sides. This makes the overall structure more stable, ensuring that the flame-retardant pressure roller B51 is, for example, horizontal, and will not accidentally tilt or wobble due to uneven force at both ends. Of course, the balancing counterweight B519 and / or the fixed rotating shaft B517 can also be individually provided on each swing arm B515. Preferably, in the balanced state, the height of the flame-retardant pressure roller B51 is lower than the balancing counterweight B519, and one end of the swing arm B515 with the flame-retardant pressure roller B51 is slightly inclined downwards, which better maintains the flame-retardant pressure roller B51 in this balanced position and achieves the effect of gently pressing the film.

[0142] Preferably, the counterweight B519, the fixed rotating shaft B517, and / or the flame-retardant pressure roller B51 are connected to the swing arm B515 in an adjustable position, so as to facilitate flexible adjustment of the balance state of the flame-retardant pressure roller B51 according to the actual situation.

[0143] A preferred embodiment of the adjustable counterweight B519 (i.e., driven by a counterweight drive device) includes, for example, a sliding groove extending towards the fixed pivot B517 at one end of the swing arm B515. The counterweight B519 is slidably connected within this groove. The counterweight drive device is a counterweight adjustment bolt B520. The counterweight B519 has threaded holes at both ends, and the adjustment bolt B520 is threadedly connected to it. The adjustment bolt B520 is also rotatably connected to the swing arm B515. The sliding direction of the counterweight B519 matches the length direction of the adjustment bolt B520, both being a direction from the end of the swing arm B515 towards the center. During adjustment, the counterweight adjusting bolt B520 rotates in its original position. Due to the engagement of the thread and the sliding limit, the counterweight B519 can move along the slide groove, thereby adjusting the torque on the counterweight side; for example, moving the counterweight B519 from the end to the middle causes the flame-retardant pressure roller B51 to change from an open state to a closed state. Alternatively, as an optional alternative, the counterweight adjusting bolt B520 is rotatably connected to the counterweight B519, and the counterweight adjusting bolt B520 is threadedly connected to the swing arm B515, achieving a similar technical effect. Further optionally, the counterweight adjusting bolt B520 is connected to an electric drive device to control its rotation, thereby enabling wired control, remote control, or automatic control. It is understood that the balance adjustment mechanism B518 is not limited to the above embodiments.

[0144] As a supplementary explanation, in various embodiments, there are three connection methods between the fixed rotating shaft B517 and the swing arm B515: the first is that the fixed rotating shaft B517 is adjustablely fixedly connected to the swing arm B515 via the top rod assembly B55 and the pressure roller fine-tuning device; the second is that the fixed rotating shaft B517 is directly positioned or fixedly connected to the swing arm B515 via a key or bolt, etc.; in the above two embodiments, both ends of the fixed rotating shaft B517 are rotatably connected to the frame, for example, through bearing seats, so that the fixed rotating shaft B517 can rotate freely and move with the swing arm B515. The third option is to directly control the rotation and stationary state of the fixed shaft B517 by either rotating it or by installing a motor at the outer end of the fixed shaft B517; the fixed shaft B517 and the swing arm B515 are rotatably connected. The fixed shaft B517 can be either fixedly connected to the frame or rotatably connected. The swing arm B515 can rotate freely without being affected by the rotation of the fixed shaft B517. In this option, the motor cannot be used to directly control the rotation of the fixed shaft. Instead, the tilt angle can still be controlled by directly applying a force to the swing arm B515 or by using the counterweight of the swing arm B515 itself for balance.

[0145] It is understandable that the transition between the non-closed and closed states of the flame-retardant roller assembly can be achieved manually or electrically or automatically. For example, it can be manually controlled after a fire is detected, or it can be automatically controlled after a fire occurs and is extinguished, if equipped with a fire monitoring device.

[0146] Preferably, the device also includes a fixed limiting rod B521. A longitudinal limiting groove B522 (e.g., a strip-shaped or arc-shaped slot, which can be through or non-through, but preferably through the swing arm B515) is provided on the balancing mechanism B53 (e.g., on the swing arm B515). One end of the fixed limiting rod B521 is located at a fixed position (e.g., on the frame), and the other end is engaged in the longitudinal limiting groove B522. This limits the vertical movement of the balancing mechanism B53, preventing the flame-retardant pressure roller B51 from deviating excessively. It also prevents the flame-retardant pressure roller B51 from pressing the film with excessive force, causing deformation, even at its closest reach to the flame-retardant guide roller B52. In other embodiments, methods such as a locking block, a stop bar, or other blocks / plates or pull ropes located at a defined position on the periphery of the swing arm B515 can be used to externally block the position of the swing arm B515, achieving the desired limiting effect. Specifically, for example, the fixed limiting rod B521 is set at a fixed position (e.g., on the frame). The fixed limiting rod B521 is set above and / or below the outside of the balancing mechanism B53. In other words, unlike the previous embodiment, the balancing mechanism B53 does not have a longitudinal limiting groove B522. Instead, the limiting function is achieved by the edge of the balancing mechanism B53 cooperating with the fixed limiting rod B521.

[0147] Preferably, the multi-roller system inside the stripping chamber is positioned above the ground. Specifically, for example, the distance between the lowest roller in the multi-roller system and the floor of the stripping chamber is greater than one meter, and most rollers are arranged at a height of approximately 2.2 meters, especially those near the inner door of the buffer room. This arrangement prevents dust from being stirred up by personnel during operation and adhering to the film. It should be noted that while both the stripping chamber and its surroundings are clean spaces, this only guarantees an extremely low dust concentration, not a complete absence of dust. Existing equipment often places rollers close to the ground for ease of maintenance, but this design, considering the high-quality requirements of high-end films, improves upon this often-overlooked aspect of roller arrangement height, further ensuring film quality.

[0148] The third aspect of this invention relates to improvements to the casting machine, mainly aimed at solving problems such as insufficient temperature control in existing equipment. This solution can more accurately control the process time of each process of the film material, the temperature in the hardening state, and the drying method, and make the temperature change continuous to avoid abrupt changes, thereby helping to achieve better casting film hardening effect, effectively improving film quality, and ensuring solvent evaporation efficiency.

[0149] Please refer to Figures 27 to 33. This invention discloses a multi-temperature zone casting machine, comprising a laterally distributed active drum A71 and a passive drum A72, and a steel belt drively connected to the active drum A71 and the passive drum A72. The active drum A71, the passive drum A72, and the steel belt are located within an insulated oven of the casting machine. The oven includes an upper drying channel A1, a passive drum chamber A82, and a lower drying channel A2, sequentially connected along the steel belt conveying direction. The upper drying channel A1 and the lower drying channel A2 correspond to the upper and lower straight sections of the steel belt, respectively. The passive drum A72 is housed within the passive drum chamber A82. The oven is a sealed and insulated chamber with an inspection door and ventilation system inlets and outlets. One of the main improvements of this invention is that multiple temperature zones are formed in the upper drying tunnel A1, the passive rotating drum chamber A82, and the lower drying tunnel A2. The temperature zones include at least a first temperature zone A91, a curved temperature zone A93, and a lower drying tunnel temperature zone A94. Each temperature zone is an adjustable temperature zone.

[0150] The first temperature zone A91 is a preheating and pre-evaporation temperature zone with parallel air ducts. At least one first temperature zone A91 is located in the upper drying tunnel A1, and this first temperature zone A91 is close to the entrance of the upper drying tunnel A1 (the right end of the upper drying tunnel A1 in the figure). A parallel air circulation processing device A3 is provided in the first temperature zone A91. The parallel air circulation processing device A3 includes a parallel air duct inlet A32 and a parallel air duct outlet A31 arranged opposite to each other. The parallel air duct inlet A32 and the parallel air duct outlet A31 are located above and below the steel strip, respectively, or only above the steel strip (the cast film slurry is also located above the steel strip in this area). The parallel air circulation processing device A3 blows preheating air in a direction generally parallel to the steel strip, forming airflow in that direction.

[0151] The curved temperature zone A93 is a transitional temperature zone between the upper drying tunnel A1 and the lower drying tunnel A2. At least one curved temperature zone A93 is present in the passive drum chamber A82; for example, the internal space of the passive drum chamber A82 may constitute a curved temperature zone A93, or the internal space of the passive drum chamber A82 may be further divided, for example, into upper and lower temperature zones that can be set to the same or different temperatures. A curved section temperature control device, such as a far-infrared heating device or a ceramic heating device, is provided in the curved temperature zone A93 or on the outside of the passive drum chamber A82 to control the temperature within the curved temperature zone A93. According to some embodiments, the curved section temperature control device may be, for example, a heating device such as a heating plate located on the outside of the passive drum chamber A82, and / or heating may be achieved by delivering hot air, for example, by using pipelines or longitudinal air circulation devices to blow hot air into the curved temperature zone A93 or toward the steel belt.

[0152] The lower drying tunnel temperature zone A94 is a temperature zone for further heating. There is at least one lower drying tunnel temperature zone A94 in the lower drying tunnel A2. At this time, the film surface has been initially hardened, so existing or feasible air supply methods can be used for heating. For example, in the specific embodiment, a hot air blowing method that is basically facing the film surface is used.

[0153] Taking polyimide film as an example, a mixer is used to uniformly mix the main material, polyamic acid resin, and the auxiliary material, imidizing agent. Then, the mixed slurry is output from the mold at the discharge end of the mixer to the steel belt at the active drum A71 of the casting machine. The slurry moves, is heated, evaporates the solvent, and gradually forms a preliminary film as the steel belt rotates. Finally, after nearly one revolution, it is peeled off from the steel belt at the active drum A71 by the peeling roller; this process continues. Taking Figure 27 as an example, the film slurry first drips onto the upper right position of the annular steel belt. Then, as the steel belt moves counterclockwise, it first enters the first temperature zone A91 where the parallel air circulation treatment device A3 is located. This area is used for preheating and pre-evaporation, and to give the film surface a certain hardness. The parallel air duct method is used to ensure that there is a certain airflow in this area, so that the surface of the film slurry (wet film) begins to harden, while avoiding hot air blowing directly onto the film surface. After passing through the first temperature zone A91, the film surface hardness is sufficient to withstand conventional hot air. Subsequent hot air can be blown generally directly onto the film surface for more direct and efficient heat transfer and accelerated solvent evaporation. On the other hand, after passing through the upper drying tunnel A1, the film enters the passive rotary drum chamber A82, i.e., the curved temperature zone A93, where it continues to be heated or kept warm. This avoids the situation where the film temperature naturally decreases in this area, as is common with existing equipment. Consequently, as the film continues into the lower drying tunnel A2, the temperature change is essentially continuous without significant abrupt fluctuations.

[0154] More specifically, in the first temperature zone A91, the parallel air circulation treatment device preferably adopts a structure similar to a static pressure box. The parallel air duct inlet A32 and the parallel air duct outlet A31 are both located on the corresponding static pressure box. Parallel air duct flow equalization plates and / or air regulating plates are provided at both the parallel air duct inlet A32 and the parallel air duct outlet A31 to ensure the uniformity of the parallel airflow and preheating effect. Furthermore, the flow rate or direction can be adjusted. The parallel air duct flow equalization plate is, for example, a porous flat plate, and the air regulating plate is, for example, a grid. The parallel air duct flow equalization plate is provided with several air holes or several slits. The parallel air duct flow equalization plate can be configured as multiple layers, with the air holes or slits in each layer arranged opposite to or staggered. In some embodiments, the air vents are, for example, small holes arranged closely on the flow equalization plate; in other embodiments, the air vents are arranged strip-shaped holes, or the flow equalization plate is grid-shaped or mesh-shaped; or it is a combination of multiple hole types; the slit hole is a long and narrow slit-shaped hole, for example, one or more slit holes, and the length direction of the slit hole is, for example, parallel to the width direction of the film or inclined at a certain angle.

[0155] In a preferred embodiment, in the parallel air circulation processing device, the parallel air duct outlet A31 is relatively close to the inlet of the upper drying tunnel A1, and the parallel air duct inlet A32 is located on the opposite side of the parallel air duct outlet A31, relatively far from the inlet of the upper drying tunnel A1. The direction of the parallel air is towards the inlet of the upper drying tunnel A1, opposite to the direction of the film slurry movement, ensuring the airflow velocity above the film slurry in a relatively gentle and stable manner, which helps the film surface to harden.

[0156] For ease of description, a pair of oppositely arranged parallel air duct inlets A32 and outlets A31 are considered as a set of parallel air circulation processing devices. "Opposite" means that a pair of inlets and outlets are directly opposite each other, with the air path between them directly connected; in other words, they are the closest pair of oppositely oriented inlets and outlets. In the embodiment shown in Figure 29, only one set of parallel air circulation processing devices is provided in the upper drying tunnel A1, allowing parallel air to cover the entire length of the upper drying tunnel A1. In the embodiment shown in Figure 30, two or more sets of parallel air circulation processing devices are arranged sequentially along the length of the upper drying tunnel A1, dividing it into two or more first temperature zones A91.

[0157] In the embodiment shown in Figure 27, the upper drying tunnel A1 also has at least one upper drying tunnel temperature zone A92, which is located between the first temperature zone A91 and the passive rotating drum chamber A82. The film enters the upper drying tunnel temperature zone A92 after passing through the first temperature zone A91, and then enters the curved tunnel temperature zone A93. It is understood that the temperature zones in this scheme are adjacent and continuously connected. For example, in a scheme without an upper drying tunnel temperature zone A92, the first temperature zone A91 and the curved tunnel temperature zone A93 are directly adjacent; while in a scheme with an upper drying tunnel temperature zone A92, the first temperature zone A91, the upper drying tunnel temperature zone A92, and the curved tunnel temperature zone A93 are sequentially adjacent. Figure 27 shows a typical embodiment with a total of seven temperature zones. At least above the steel belt, in the upper drying tunnel temperature zone A92, there is an upper drying tunnel longitudinal air circulation treatment device A41, specifically, for example, a nozzle-type static pressure box, and the nozzle of the upper drying tunnel longitudinal air circulation treatment device A41 is facing the steel belt directly or tilted, or the direction of the nozzle is adjustable; wherein, tilting means that, as needed, at least in some areas, the blowing method is not completely facing the film surface, but has a certain tilt angle, so that the hot air blowing and the impact on the film surface are relatively gentler.

[0158] In the lower drying tunnel temperature zone A94, at least below the steel belt, there is a lower drying tunnel longitudinal air circulation treatment device A42, specifically, for example, a nozzle-type static pressure box, and the nozzle of the lower drying tunnel longitudinal air circulation treatment device A42 is facing the steel belt directly or tilted, or the direction of the nozzle is adjustable; wherein, tilting means that, as needed, at least in some areas, the blowing method is not completely facing the film surface, but has a certain tilt angle, so that the hot air blowing and impact on the film surface are relatively gentler.

[0159] Preferably, in the lower drying tunnel A2, a longitudinal air circulation treatment device A42 is also provided above the steel strip, and the longitudinal air circulation treatment device A42 is corresponding to the upper and lower sides of the steel strip; the nozzle-type longitudinal air circulation treatment devices on the inner and outer sides of the steel strip are arranged in groups opposite to each other, so that the impact of hot air on the upper and lower sides is basically offset, avoiding the problem that the nozzle-type longitudinal air circulation treatment device blows directly on the steel strip on only one side and the steel strip is subjected to obvious bending deformation. Similarly, preferably in the first temperature zone A91, a parallel air duct inlet A32 and a parallel air duct outlet A31 are also provided below the steel belt, and the parallel air circulation treatment device A3 is corresponding to the upper and lower sides of the steel belt. It can be optionally configured so that the flow rate, flow direction and other parameters of the parallel air on the upper and lower sides are consistent, so as to avoid uneven force on both sides of the steel belt and heat the other side of the steel belt and the film, thereby improving temperature uniformity and heating efficiency; and in the upper drying tunnel temperature zone A92, an upper drying tunnel longitudinal air circulation treatment device A41 is also provided below the steel belt, and the upper drying tunnel longitudinal air circulation treatment device A41 is corresponding to the upper and lower sides of the steel belt.

[0160] Understandably, this solution primarily emphasizes improvements to the airflow pattern along the movement direction of the film and steel belt. Parallel air circulation devices and longitudinal air circulation devices along the width of the steel belt can be arranged in a single row or multiple rows side-by-side, depending on the specific requirements. Of course, the oven or temperature zone typically also includes temperature measurement devices, etc., to achieve the necessary functionalities.

[0161] In a more preferred embodiment, a casting negative pressure air curtain device A5 is provided at the adjacent locations of the two temperature zones, as well as at the inlet and outlet of the upper drying tunnel A1 and the lower drying tunnel A2 (in other words, at the boundaries connecting the various temperature zones within the oven). The function of the casting negative pressure air curtain device A5 is to create temperature and air barriers between the various temperature zones, preventing uncontrollable mutual interference caused by gas diffusion and escape between the temperature zones. The casting negative pressure air curtain device A5 includes a first casting negative pressure air curtain exhaust section A51 and a second casting negative pressure air curtain exhaust section A52 arranged vertically opposite each other. The first casting negative pressure air curtain exhaust section A51 and the second casting negative pressure air curtain exhaust section A52 are located on both sides of the steel belt, and a casting negative pressure air curtain channel space A54 for the steel belt to pass through is formed between the first casting negative pressure air curtain exhaust section A51 and the second casting negative pressure air curtain exhaust section A52. A further preferred structure for the casting negative pressure air curtain device A5 can be found in the aforementioned stripping negative pressure air curtain device, and will not be repeated here.

[0162] More specifically, the temperature zones are divided within the upper / lower drying tunnels by structures such as partitions A14. Each partition has a central opening for the passage of steel strips (and films), and a cast negative pressure air curtain device A5 is sealed at this opening. A transversely sealed partition exists between the upper drying tunnel A1 and the lower drying tunnel A2. The adjacent sides of each temperature zone within the oven are only connected by a passageway (connection opening) through which the steel strip can pass; the rest is sealed. During operation, the first and second exhaust sections of the cast negative pressure air curtain, A51 and A52, simultaneously exhaust air. When the airflow reaches the partition between adjacent temperature zones, it is drawn away by the first and second exhaust sections of the cast negative pressure air curtain on both sides, thus preventing airflow from entering adjacent spaces. Especially for polyimide films, it is necessary to promptly remove the evaporated solvent (flammable gas) from the oven, ensure solvent evaporation efficiency, and prevent solvent gas from escaping into other temperature zones or spaces. For example, it is crucial to prevent excessive solvent content in high-temperature zones from causing combustion or explosion. In this solution, since hot air cannot flow between spaces, temperatures also cannot flow between them. Therefore, the temperature and solvent gas content in each temperature zone are well controllable. Furthermore, because the airflow in adjacent spaces is drawn towards the center, a certain temperature transition zone is formed between adjacent spaces, which can prevent sudden changes in ambient temperature when the film enters or exits a temperature zone.

[0163] In the preferred ventilation system, each temperature zone has a main exhaust vent (a separate structure from the casting negative pressure air curtain device A5), used to coordinate with the air inlet to form overall airflow within the temperature zone, thereby expelling the solvent. The main exhaust vent is located on the oven body; after the hot air enters, it carries the evaporated solvent out through the main exhaust vent. Preferably, the oven body has an oven exhaust vent A61 near the edge of the temperature zone (such as on both sides of the casting negative pressure air curtain device A5 and partition A14), and / or, the oven body has an oven exhaust vent A61 near the passive rotating drum A72 (such as next to the passive rotating drum A72, on the side wall of the passive rotating drum chamber A82). This design places the oven exhaust vent in the dead corners of the oven, i.e., where the evaporated solvent tends to stagnate and accumulate, thus focusing exhaust from these solvent-prone areas, ensuring airflow in the dead corners, and improving the efficiency and effectiveness of solvent removal.

[0164] The oven air inlet A62 is related to the setting of the static pressure chamber. For example, an air inlet is set on the side wall of the chamber perpendicular to the partition (i.e., on both sides of the chamber's length). Specifically, for example, the oven air inlet A62 corresponding to the nozzle-type static pressure chamber A4 is located in the middle of the temperature zone, on both sides of the oven body; the air inlet position corresponding to the parallel air circulation treatment device corresponds to the parallel air duct air inlet A32. For the upper drying duct, the air inlet and exhaust port can also be opened at the top of the oven body; for the lower drying duct, the situation and setting principle of the air inlet and exhaust port can be similar to that of the upper drying duct, the difference being that they are opened on the left and right sides of the oven body. The oven exhaust port A61 is sealed to the chamber body and is connected to a negative pressure fan and exhaust gas treatment system, etc. The relevant required components / systems are existing technology and will not be described in detail here.

[0165] An active drum chamber A81 is located outside the active drum A71, and is connected to the upper drying tunnel A1 and the lower drying tunnel A2. Preferably, the active drum chamber A81 is equipped with a temperature control device for the feed section, such as a pipe or air box for blowing cooling air, or contact cooling of the steel strip, to ensure that the temperature in the active drum chamber A81 is not too high and can be maintained at, for example, room temperature or slightly below room temperature. This is because the temperature of the mixed film raw material slurry is generally lower than room temperature. If the ambient temperature is high when the slurry is fed into the steel strip of the active drum A71, solvent will evaporate into the outside space after the slurry is fed in. This solution ensures that the film material has virtually no volatile solvent in the active drum chamber A81 (especially the upper feed side), and is gradually heated after entering the upper drying tunnel.

[0166] Preferably, the bearings, bearing housings, motors, and steel belt correction devices of the active drum A71 and the passive drum A72 are located on the outside of the oven body to avoid long-term operation in a high-temperature environment, thereby effectively improving their service life.

[0167] Preferably, the present invention also features an explosion-proof structure for the casting machine oven, solving the problem that existing solutions cannot simultaneously guarantee solvent evaporation efficiency and safety. This allows for more detailed division and temperature control of the oven, as well as status monitoring, and ensures timely pressure relief in extreme situations to prevent major accidents. This solution is primarily aimed at situations involving the chemical production of cast films, where volatile solvents are flammable and explosive.

[0168] The casting machine oven body is provided with a pressure relief vent A63 at least in the first temperature zone and / or the second temperature zone near the entrance of the drying tunnel (upper drying tunnel). For example, the pressure relief vent is located in the first temperature zone and / or other temperature zones of the upper drying tunnel, more specifically in the first temperature zone and the second and third temperature zones downstream of the first temperature zone. The pressure relief vent A63 is preferably located at least in the first temperature zone and the second temperature zone downstream of it, where the solvent concentration is high, and the pressure relief vent can relieve pressure under extreme conditions.

[0169] The explosion vent A63 can adopt an existing structure, such as having an explosion vent plate, to promptly vent the explosion in the event of a deflagration. A temperature detection device A11 (e.g., an infrared thermometer positioned on the back side of the steel strip A10) and / or a concentration detection device A12 (e.g., a gas detector or pressure gauge) for detecting the concentration of solvent gas in the film raw material are also provided in the temperature zone. In existing solutions, only the air temperature inside the oven is typically considered, neglecting the actual temperature of the steel strip. If the steel strip temperature is too high, combustion can easily occur; furthermore, monitoring the solvent concentration and gas pressure can also warn of the risk of explosion. Preferably, the concentration detection device A12 and the explosion vent A63 are located in a dead zone, i.e., a location where the evaporated solvent is prone to stagnation and accumulation.

[0170] Specifically, in the embodiment shown in Figure 32, the upper drying tunnel has two temperature zones, and preferably, explosion vents A63 are provided in both temperature zones. For example, the explosion vents A63 are provided on the top surface of the chamber. In the embodiment shown in Figure 27, the casting machine oven has seven temperature zones, including the first, second, and third temperature zones in the upper drying tunnel, the fourth temperature zone in the passive drum chamber, and the fifth, sixth, and seventh temperature zones in the lower drying tunnel. These seven temperature zones are sequentially connected along the film movement direction. The first two temperature zones at the entrance of the upper drying tunnel have the highest amount of evaporated solvent gas and are most likely to accumulate chemical solvents. The solvent concentration in subsequent temperature zones generally shows a gradually decreasing trend. Therefore, this solution provides explosion vents A63 in the first temperature zone and the second temperature zone, with at least one explosion vent A63 in each of these two temperature zones. The third temperature zone and subsequent temperature zones can be optionally equipped with explosion vents A63 depending on the specific circumstances and requirements.

[0171] More specifically, in this embodiment, the fourth temperature zone (i.e., the curved temperature zone A93) is equipped with, for example, a far-infrared heating device or a ceramic heating device. The far-infrared or ceramic heating method is used to heat the film and steel belt at the passive drum. The fourth temperature zone is located between the upper and lower drying tunnels in the film conveying path. In existing equipment, there is no heating device in the passive drum chamber, and the temperature is only maintained by the box structure. After the film passes through this section, the temperature will drop. When it enters the temperature zone of the lower drying tunnel, the film temperature will change abruptly, which will affect the process quality. This solution can achieve more precise temperature control, which can make the film temperature change basically continuously and avoid the impact of temperature change on film quality.

[0172] In some embodiments, an auxiliary temperature control device A13 for adjusting the temperature of the steel strip is also provided in the temperature zone. The auxiliary temperature control device A13 is, for example, a non-contact heating plate, which is located on the back side of the steel strip A10. By adjusting the output temperature of the auxiliary temperature control device A13, the steel strip A10 can be directly heated or cooled to a certain extent, making the temperature control of the steel strip more precise and flexible.

[0173] Preferably, the system also includes an automatic alarm device to prevent concealment. Temperature detection device A11 and / or concentration detection device A12, as well as the explosion vent A63, are all connected to the automatic alarm device. This automatic alarm device is connected to the main control equipment or the system of the parent company / regulatory department, enabling automatic alarms or fault information uploads when detected temperature / concentration levels exceed limits or when an explosion occurs, thus preventing concealment. It is understood that monitoring the status of the explosion vent A63 can be achieved, for example, by placing a sensor near the explosion vent. When the explosion vent breaks, the sensor will be triggered (for example, when the explosion vent breaks, the air pressure outside the explosion vent will change significantly).

[0174] The fourth aspect of this invention is an improvement on the insulation board unit for a polyimide film production line and the insulation box body composed of the insulation unit. The main purpose is to solve the problems of high cost or poor insulation effect of the existing technical solutions. The improved structural design achieves better insulation effect, while the structure is relatively simple and the cost is relatively low.

[0175] Please refer to Figures 34 to 43. The present invention first provides a main load-bearing insulation board unit D1, which includes a main support frame D10. The main support frame D10 is provided with a main load-bearing insulation unit reserved opening D2 to facilitate the installation of auxiliary components. The main support frame D10 has a three-dimensional structure, and a hollow cavity D100 is formed inside it. The hollow cavity D100 is filled with an insulation filling layer D20 or other insulation structures.

[0176] Please refer to Figure 35, which shows an embodiment of the main support frame D10. The main support frame D10 includes an outer frame D11 and an inner frame D12. The inner and outer frames are connected by a main support connector D13, which is located around the frame to form a hollow cavity D100. The hollow cavity can be filled with multiple layers of thermal insulation D20. The thermal insulation layer D20 can be thermal insulation cotton or other thermal insulation materials, preferably, for example, aluminum silicate thermal insulation cotton, which has a lower thermal conductivity than air. Alternatively, a heat insulation board can be added inside the hollow cavity to form a thermal break structure with two or more sections. The thermal insulation layer D20 can be located on both sides of the heat insulation board, and the structural components do not directly contact each other, effectively blocking the transfer of heat. This achieves better thermal insulation effect, and the relevant materials and processes are relatively mature, resulting in a lower manufacturing cost for this solution.

[0177] The hollow cavity of the main support frame D10 is equipped with an internal support beam D14 to form a load-bearing frame with the main support frame. Pre-drilled openings are provided for installing different external components. The internal support beam D14 needs to consider the overall layout and weight of these external components. It can be located on one side of the inner frame, one side of the outer frame, or both sides simultaneously. The internal support beam D14 is typically lower than the main support connector D13, which effectively reduces overall weight and cost while providing sufficient support. Alternatively, a support beam or frame with the same load-bearing capacity as the main support connector D13 can be used as needed.

[0178] The main load-bearing insulation unit's reserved opening D2 can be several air outlets / inlets, or it can be used to install other external equipment. It is composed of a support frame D21, a support rod, or a support plate. The reserved opening support frame D21 has a reinforcing member D22 on one side of the inner frame and / or the outer frame, which is shown as an angle iron in the figure. To prevent heat conduction by the reinforcing member D22 and the reserved opening support frame D21, a heat insulation measure, such as a heat insulation board or heat insulation layer D25, is provided in between when they are connected to the inner frame and / or the outer frame, or a heat insulation gap is reserved in between. The main load-bearing insulation unit's reserved opening D2 usually extends outward, and it has an external connecting part D23, that is, the outer support frame. Considering the heat insulation measures when it extends to the outside, a heat insulation measure, such as a heat insulation layer or covering with heat insulation material, is provided between the external connecting part D23 and the outer frame D11. In this embodiment, the main support connector D13 is a channel steel, and the internal support beam and reserved opening reinforcement can be an I-beam, channel steel, or angle iron. The entire main support frame D10 is a three-dimensional frame composed of these components. The main support connector D13 is set around the frame to form a sturdy support and load-bearing mechanism.

[0179] Please refer to Figure 36, which illustrates another embodiment of the present invention, where the outer frame D11 and / or the inner frame D12 are multi-layered thermal insulation structures. The outer frame D11 and / or the inner frame D12 are composed of an outer sealing plate D101, a heat insulation plate D102, and an inner sealing plate D103. The heat insulation plate D102 can be made of calcium silicate board or other thermal insulation materials. Other structural elements are essentially the same as in the embodiment shown in Figure 35. The reinforcement component D22 of the pre-reserved opening support frame D21 can be directly connected to the inner side plate, achieving thermal insulation without the need for additional insulation measures.

[0180] As shown in Figure 37, this is an insulation board composed of insulation board units. It includes two interconnected insulation board units. Referring to Figure 38, a buffer plate D15 is provided on the adjacent side of the two interconnected insulation board units. This buffering, insulation, and reinforcement functions are achieved through the separation of non-metallic materials. When using extra-long materials, a spacer support frame with the same structure as the main support connector D13 is installed at the middle or load-bearing locations to ensure the strongest overall load-bearing capacity.

[0181] As shown in Figure 39, it is the side insulation panel unit D3, which is mainly used for the housing of casting machine or horizontal drawing machine. The side insulation panel unit D3 is composed of insulation structure and has a reserved opening D4 for installing external equipment, or maintenance door or observation window, etc.

[0182] As shown in Figures 39 to 43, the side insulation panel unit D3 includes a main support frame D30, which includes a first support frame D31 and a second support frame D32. A first heat insulation layer D33 is provided between the two. The first support frame D31 and the second support frame D32 are connected to form a three-dimensional support with an open inner and outer side. The first support frame D31 is directly or indirectly connected to an inner side plate D301, and the second support frame D32 is directly or indirectly connected to an outer side plate D302, forming a hollow cavity structure as a whole.

[0183] The first support frame D31 and the second support frame D32 can be formed into a square or rectangular frame by angle irons. The two frames are connected by one side of the angle irons, and a first heat insulation layer D33 is provided between the two frames. The other side of the angle iron serves as a side for connection and fixation to the inner side plate D301 and the outer side plate D302. In addition to shielding the open areas, the inner side plate D301 and the outer side plate D302 are provided with connecting edges that fit the side of the angle irons. Ideally, the width of the connecting edges should be the same as the side of the angle irons to improve the overall aesthetics.

[0184] The thickness of the two interlocking angle iron frames forming a hollow cavity structure is limited. A third support frame D34 can be added, connecting to one side of the inner side panel D301 or the outer side panel D302 to expand the space of the hollow cavity. As shown in the figure, the third support frame D34 is a square or rectangular frame formed by longitudinal plates with a slightly bent section on one side. One side connects to one side of the angle iron of the second support frame D32, and the other side connects to the connecting edge of the outer side panel D302 from the inside of the frame through the bent section. For further heat insulation, a second heat insulation layer D35 is provided on the surface of the third support frame D34 in contact with the outer side panel D302. The addition of the third support frame D34 can expand the overall thickness of the side insulation panel unit and further improve the heat insulation performance.

[0185] In this embodiment, the overall structure of the side insulation panel unit, from the inside to the outside, consists of an inner side panel D301, a first support frame D31, a heat insulation layer D33, a second support frame D32, a third support frame D34, a heat insulation layer D35, and an outer side panel D302, and is internally filled with a heat insulation filling layer. In this embodiment, a heat insulation layer is provided within the hollow cavity. This heat insulation layer can be a heat insulation material filling the entire space, or it can be a multi-layered heat insulation panel. This side insulation panel unit is not a load-bearing unit. Through multiple methods, including the internal heat insulation layer and the heat insulation layer between the outer side panel D302 and the frame it contacts, the inner and outer sides achieve very strong heat insulation functionality. Generally speaking, a single layer of inner panel D301 and / or outer panel D302 can achieve very good thermal insulation. If you want to reduce the cavity thickness or pursue the ultimate thermal insulation effect, inner panel D301 and / or outer panel D302, which include an outer sealing plate, a thermal insulation plate and an inner sealing plate, can be made into a multi-layer thermal insulation board, and multiple layers of thermal insulation boards can be placed on it.

[0186] The main support frame D30 has a reserved opening D4 for side insulation panel units, used for installing external equipment or maintenance doors. To ensure the thermal insulation function of the reserved opening, the reserved opening D4 includes a reserved opening support frame D41. A thermal insulation layer is provided between the reserved opening support frame D41 and the outer side panel D302, achieving thermal insulation between the reserved opening support frame D41 and the outside. Of course, a thermal insulation layer can also be provided on the inner side panel to further enhance the thermal insulation effect of the frame in contact with the outside at the reserved opening location.

[0187] An insulated door D5 is installed within the reserved opening. The insulated door D5 includes an outer peripheral panel D51, an inner panel D52, and an outer panel D53. The outer peripheral panel D51 includes the panels on both sides and the top of the door, forming a frame. A support plate D55 can be installed inside. A door insulation layer D54 is installed between the outer peripheral panel D51 and the inner panel D52, and / or between the outer peripheral panel D51 and the outer panel D53. An insulation layer is installed at the contact point between the insulated door D5 and the reserved opening D4 of the side insulation panel unit to prevent heat conduction. An observation window D6 is installed inside the insulated door D5. The observation window D6 includes an inner frame D61 and an outer frame D62, with an insulation layer between them. A double-glazed window is installed on the outer frame, and an insulation layer is installed between the double-glazed window and the outer panel D53.

[0188] In this embodiment, the structure of the casting machine includes the upper and lower sides of the box body, which are composed of main load-bearing insulation board units, and the side insulation board units. Each insulation board unit is a hollow cavity structure formed by at least two support frames and at least one insulation layer between them. Single-layer sealing plates (side plates) are provided on the open sides of the hollow cavity, thus forming a thermal insulation method similar to thermal break insulation. Insulation material is filled into the cavity, or at least multiple insulation layers are provided, to achieve good thermal insulation performance for the entire cavity. The main support frame of the main load-bearing unit is made of high-load-bearing materials such as channel steel or I-beams. This part may not be covered with insulation material, but can be directly covered by the side insulation board units with a double-pole thermal break insulation method, thereby achieving high overall thermal insulation performance. In this embodiment, the insulation box structure of the horizontal drawing machine differs from that of the casting machine in the location and number of reserved openings, and the function of the reserved opening installation components is different.

[0189] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; obviously, the described embodiments are some embodiments of the present invention, but not all embodiments; based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention; in the absence of conflict, the embodiments and features in the embodiments of the present invention can be combined with each other; modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions for some of the technical features, do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A modular composite polyimide film production line, characterized in that, It includes a casting machine, a stripping chamber, and a horizontal stretching machine; the horizontal stretching machine is composed of horizontal stretching box units that can be combined. The horizontal stretching box unit is divided into a ceramic heating subunit or a hot air heating subunit. There are two or more horizontal stretching box units, and each horizontal stretching box unit contains at least one ceramic heating subunit and one hot air heating subunit.

2. The modular composite polyimide film production line according to claim 1, characterized in that, The ceramic heating subunit is equipped with a thin film inlet and a thin film outlet. Between the thin film inlet and the thin film outlet, there are multiple individually detachable temperature control modules, which are arranged side by side according to the direction of film travel. The temperature control module consists of multiple individually detachable horizontal pull box ceramic temperature control units, and each horizontal pull box ceramic temperature control unit is equipped with a temperature measuring device and a temperature control device.

3. The modular composite polyimide film production line according to claim 1, characterized in that, The horizontally pulled box unit is equipped with a horizontally pulled negative pressure air curtain device at its inlet and outlet. The horizontally pulled negative pressure air curtain device includes a first exhaust section and a second exhaust section of the horizontally pulled negative pressure air curtain that are arranged opposite to each other. At least one flow equalization plate is provided in both the first exhaust section and / or the second exhaust section of the horizontally pulled negative pressure air curtain. A channel space is formed between the first exhaust section and the second exhaust section of the horizontally pulled negative pressure air curtain.

4. The modular combined polyimide film production line according to claim 1, wherein the horizontal stretching machine has an amplitude adjustment device, the amplitude adjustment device includes a horizontal stretching frame, and also includes two horizontally independently arranged guide rail fixing seats, each guide rail fixing seat is slidably arranged on the horizontal stretching frame, each guide rail fixing seat is connected to an amplitude adjustment mechanism, each amplitude adjustment mechanism independently drives the guide rail fixing seat to move or synchronously drives the guide rail fixing seat to move through a synchronization mechanism.

5. The modular composite polyimide film production line according to claim 1, characterized in that, The stripping chamber is a sealed box structure with at least a film inlet, an outlet, and a ventilation system. A stripping negative pressure air curtain device is provided at the film inlet of the stripping chamber. The stripping negative pressure air curtain device includes a first stripping negative pressure air curtain exhaust section and a second stripping negative pressure air curtain exhaust section arranged opposite each other. At least one flow equalization plate is provided in the first stripping negative pressure air curtain exhaust section and / or the second stripping negative pressure air curtain exhaust section. The first stripping negative pressure air curtain exhaust section and the second stripping negative pressure air curtain exhaust section are located on the upper and lower sides of the film conveying path, respectively. A channel space for film passage is formed between the first exhaust section and the second exhaust section.

6. The modular composite polyimide film production line according to claim 1, characterized in that, The peeling chamber has a multi-roller system; the multi-roller system includes guide rollers, traction rollers, and gravity rollers mounted on the multi-roller system frame; the guide rollers are driven rollers; a peeling roller is located after the casting machine; the traction roller is located downstream of the peeling roller, and one or more guide rollers are spaced between the traction roller and the peeling roller; the traction roller includes two adjacent drive rollers, and the film transport path at the traction roller has an S-shaped structure; the gravity roller is located downstream of the traction roller, and one or more guide rollers are spaced between the gravity roller and the traction roller; the gravity roller is a driven roller, and its upstream and downstream sides are adjacent to the guide rollers, and the height of the gravity roller is lower than that of the guide rollers on both sides; the gravity roller and the gravity roller counterweight mechanism are mounted on the same closed chain or on two closed chains respectively through a synchronous transmission mechanism.

7. The modular composite polyimide film production line according to claim 6, characterized in that, The multi-roller system also includes two side pressure rollers, which are located at the two side edges of the multi-roller system. The two side pressure rollers are located on the upper and / or lower side of the film conveying path, and there is a gap between the two side pressure rollers and the film conveying path. And / or, the multi-roller system also includes a flame-retardant roller assembly, which includes a flame-retardant pressure roller and a flame-retardant guide roller. The flame-retardant pressure roller is mounted on the balancing mechanism, and the flame-retardant guide roller is one of the guide rollers. Under normal conditions, the flame-retardant pressure roller and the flame-retardant guide roller are in a non-closed state. In the event of a fire, the balancing mechanism drives the flame-retardant pressure roller and the flame-retardant guide roller to close.

8. The modular composite polyimide film production line according to claim 1, characterized in that, The casting machine includes an active drum, a passive drum, and a steel belt connected to the active drum and the passive drum. It also includes an upper drying tunnel, a passive drum chamber, and a lower drying tunnel that are connected sequentially along the conveying direction of the steel belt. Multiple temperature zones are formed in the upper drying tunnel, the passive drum chamber, and the lower drying tunnel, and each temperature zone is an adjustable temperature zone. A casting negative pressure air curtain device is installed at the adjacent points of the two temperature zones and at the entrance and exit of the upper and lower drying tunnels. The casting negative pressure air curtain device includes a casting negative pressure air curtain first exhaust section and a casting negative pressure air curtain second exhaust section arranged opposite to each other. The casting negative pressure air curtain first exhaust section and the casting negative pressure air curtain second exhaust section are respectively located on both sides of the steel strip. A channel space for the steel strip to pass through is formed between the casting negative pressure air curtain first exhaust section and the casting negative pressure air curtain second exhaust section. The channel space for the steel strip to pass through is adapted to the width of the steel strip.

9. The modular composite polyimide film production line according to claim 8, characterized in that, The temperature zone includes at least the first temperature zone, the upper drying tunnel temperature zone, the curved drying tunnel temperature zone, and the lower drying tunnel temperature zone; The upper drying tunnel has at least one first temperature zone, which is located near the entrance of the upper drying tunnel. A parallel air circulation treatment device is provided in the first temperature zone. The parallel air circulation treatment device includes a parallel air duct inlet and a parallel air duct outlet arranged opposite to each other. The parallel air duct inlet and the parallel air duct outlet are located above and below the steel belt, or only above the steel belt. The upper drying tunnel also has at least one upper drying tunnel temperature zone, which is located between the first temperature zone and the passive rotating drum chamber. An upper drying tunnel longitudinal air circulation treatment device is provided at least above the steel belt in the upper drying tunnel temperature zone, and the nozzle of the upper drying tunnel longitudinal air circulation treatment device is facing or tilted towards the steel belt, or the direction of the nozzle is adjustable. The passive drum chamber has at least one curved temperature zone, and a curved section temperature control device is provided in the curved temperature zone or on the outside of the passive drum chamber. The lower drying tunnel has at least one lower drying tunnel temperature zone, and the lower drying tunnel temperature zone is provided with a lower drying tunnel longitudinal air circulation treatment device at least below the steel belt, and the nozzle of the lower drying tunnel longitudinal air circulation treatment device is facing or tilted towards the steel belt, or the direction of the nozzle is adjustable.

10. The modular composite polyimide film production line according to claim 1, characterized in that, The casting machine includes an active drum, a passive drum, and a steel belt connected to the active drum and the passive drum. The casting machine oven includes a drying tunnel located outside the steel belt. The drying tunnel is divided into multiple temperature zones. The casting machine oven body is provided with a vent at least in the first temperature zone and / or the second temperature zone near the entrance of the drying tunnel. The temperature zones are also provided with a temperature detection device for detecting the temperature of the steel belt and / or a concentration detection device for detecting the concentration of solvent gas in the film raw materials.

11. The modular composite polyimide film production line according to claim 1, characterized in that, It also includes insulation board units for insulation boxes used in casting machines or horizontal stretching machines; the insulation board unit includes a main support frame, which includes an open three-dimensional support frame consisting of a single-layer main support frame or a double-layer support frame containing at least one layer of insulation, with single-layer sealing plates directly or indirectly connected to the open sides, or one side using a multi-layer sealing plate with at least one layer of insulation material, forming a hollow cavity structure as a whole.

12. The modular composite polyimide film production line according to claim 1, characterized in that, It also includes an insulated box for casting machines or horizontal stretching machines, the insulated box comprising the upper and lower sides of the box composed of main load-bearing insulation board units and the side of the box composed of side insulation board units; The main load-bearing insulation board unit includes a main support frame, which includes a hollow frame composed of the main support frame. An outer frame and an inner frame are provided on both sides of the hollow frame. The outer frame and / or the inner frame are single-layer boards or are composed of an outer sealing board, a heat insulation board and an inner sealing board, forming a hollow cavity structure as a whole. The side insulation panel unit includes a first support frame and a second support frame, with a first heat insulation layer between them. The first support frame and the second support frame are connected to form a three-dimensional support with open inner and outer sides. The first support frame is directly or indirectly connected to an inner side plate, and the second support frame is directly or indirectly connected to an outer side plate, forming a hollow cavity structure as a whole.

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