A cast film sheet coating device, film casting device and use

Abstract

The application relates to the technical field of cast film production, in particular to a cast film sheet pasting device, a film casting device and an application. The cast film sheet pasting device sequentially comprises an air inlet structure and an air outlet structure according to the air flow direction; the air outlet structure sequentially comprises an internal air outlet structure, a cylindrical air cavity structure, a gradually-changing-section transition air duct structure and a blow nozzle structure according to the air flow direction; side plates are arranged at the two ends of the air outlet structure close to the air inlet structure; width adjusting devices are arranged on the side plates; the unique air inlet structure and air outlet structure design and cooperation of the cast film sheet pasting device can make the air flow more uniformly, stably and adjustably act on the viscous flow state film material in the casting state, so that the film material can be better tightly pasted on the cooling roller, the defects such as wrinkles and bubbles of the film are reduced, and the pasting quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cast film production, in particular to a cast film sheet laminating device and a thin film casting device and uses thereof. Background Art

[0002] During film production, a high-temperature melt is cast through a die to form a high-temperature cast film sheet. This sheet is then placed on a chill roll to rapidly cool it, creating a thick plastic sheet for subsequent processing. The key to cast film formation is ensuring that the molten material adheres tightly to the chill roll surface.

[0003] The coating effect of cast film is crucial to the quality of plastic products. In the prior art, the cast film is often coated on the cooling roller by high-pressure airflow or electrostatic adsorption.

[0004] The use of high-pressure airflow places high demands on the structure of the air knife, ensuring the stability of the air outlet. For example, CN110628219B discloses a process for manufacturing polyphenylene sulfide film, which uses sodium hydrosulfide, sodium hydroxide, p-dichlorobenzene, and hexachlorobenzene as raw materials, and N-methyl-2-pyrrolidone as a solvent, to condense and polymerize the polyphenylene sulfide resin. The polyphenylene sulfide resin undergoes purification, washing, drying, extrusion granulation, devolatilization drying, melt extrusion, melt metering, melt forced filtration, a T-die, a casting roller, an air knife, a vacuum channel, a cooling roller, a thickness gauge, shaping, electrostatic bonding, and winding into a bonded polyphenylene sulfide film roll. The thickness of the film is primarily controlled by the pressure and speed of the air from the air knife at the T-die outlet, and the air pressure and speed of the air from the air knife are adjusted according to the needs of the polyphenylene sulfide film production. The positive pressure air knife is a key piece of equipment on a cast film machine. It produces a positive pressure airflow to hold the film against the casting roll. However, existing positive pressure air knives have a concentrated air volume, difficult to control air speed, and uncontrollable air temperature. This results in overly rapid cooling of the cast film base, excessive spherulites in the film, and high haze on the film surface due to differences in the degree of rapid cooling. This can also create continuous longitudinal stripes with low transparency, or uneven thickness, resulting in light and dark stripes and uneven thickness. Furthermore, due to unstable airflow, the film material on the cooling roll can be spattered onto or within the positive pressure air knife. Regular cleaning and maintenance of the positive pressure air knife is required, reducing film casting efficiency and increasing production costs.

[0005] And in the actual production process, the configuration of the air knife will also be combined with the vacuum box together, using the principle of vacuum to extract the air between the film and the casting roll, so that the film and the casting roll will not produce bubbles. When the air knife is operated, the air volume of the air knife should be controlled properly. If the air volume is too large, the molten film will shake too much, causing the film thickness deviation to increase. If the air volume is too small, the pressure is insufficient, the effect of sticking to the roll is poor, the film will produce transverse fluctuation, the film thickness deviation is large, and the film surface is deformed unevenly and cannot be produced. At the same time, the operation of the vacuum box mainly adjusts the air extraction speed to match the actual production conditions. If the air extraction speed is too large, the molten film is prone to breakage. If the air extraction speed is too small, it will not have the effect of extracting the air between the film and the casting roll. When producing products of the same thickness, the air speed of the vacuum box is faster when the production speed is faster; when the production speed is the same, the air speed of the vacuum box is faster when the product thickness is thicker. It is necessary to strictly control the related operation of the air knife and the vacuum box, which again increases the process difficulty, reduces the qualified rate of finished products, and increases the production cost.

[0006] For example, CN204019832U is a positive pressure air knife device suitable for lithium battery casting base film production, which includes high pressure air flow into the outer wind pipe, the middle wind pipe and the inner wind pipe in turn. The outer wall of the outer wind pipe is attached with a heating mechanism. The inner wind pipe is integrally processed and shaped and has a water drop structure with decreasing cross-sectional area. The opening end of the inner wind pipe is provided with a blowing nozzle. The blowing nozzle is uniformly provided with a plurality of adjusting bolts for adjusting the opening degree of the air outlet. The blowing nozzle has a duckbill structure, which includes an upper lip of the blowing nozzle and a lower lip of the blowing nozzle. The upper lip of the blowing nozzle is longer than the lower lip of the blowing nozzle. However, in this technical solution, the inner wall of the outer wind pipe, the middle wind pipe and the inner wind pipe is polished to form a super-mirror surface roughness. The entering air flow can flow smoothly to ensure the stability of the air flow. However, to obtain a super-mirror structure, the surface roughness Ra≤0.01μm requires a high precision of the processing equipment. For example, during grinding and polishing, abrasive and polishing tools with nanometer precision are required. The manufacturing process of these tools is complex and costly. Moreover, during the processing, factors such as slight vibration and temperature change of the equipment will affect the processing precision. Even the most advanced CNC machine tools are very difficult to maintain at such a high precision level for a long time.

[0007] The use of electrostatic adsorption has special requirements for the structure of the cooling roller, and the installation of the electrode, insulation protection, etc. must be considered, and the structure is relatively complex. For example, CN113784830A discloses an apparatus for manufacturing cast film, including a wide-slit nozzle, a cooling roller, an electrode assembly, an insulating assembly, a sensor device, and a control device. The electrode assembly is arranged between the impact area and the discharge area of ​​the cast film on the cooling roller. The insulating assembly is arranged between the electrode assembly and the cooling roller sleeve. The sensor device continuously obtains the left and right cast film edges. The control device moves the insulating assembly according to the obtained left and right cast film edges, so that the insulating assembly: a) is between the left end side of the cooling roller and the left cast film edge; and b) is between the right end side of the cooling roller and the right cast film edge. The sensor area of ​​the sensor device is arranged downstream of the wide-slit nozzle in the discharge direction of the cast film and upstream of the electrode assembly.

[0008] Based on the above-mentioned existing technology, there are still technical problems in the film casting process that need to be solved urgently, such as unstable air outlet due to differences in casting equipment or processes, poor film coating effect after cast forming, uneven thickness, obvious light and dark stripes, excessive film spherulites or overly complicated processes, high production costs, and low safety. Summary of the Invention

[0009] In order to solve the above technical problems, the present invention provides a cast film laminating device, which includes an air inlet structure and an air outlet structure in sequence according to the direction of air flow;

[0010] The air inlet structure includes two inlet air ducts, and the two inlet air ducts are respectively located on both sides of the air outlet structure;

[0011] The air outlet structure includes an internal air outlet structure, a cylindrical air cavity structure, a gradient cross-section transition air duct structure, and an air nozzle structure in sequence according to the direction of the air flow; one end of the gradient cross-section transition air duct structure is connected to the cylindrical air cavity structure, and the other end is connected to the air nozzle structure;

[0012] The internal air outlet structure is a cylindrical structure with intermittent air outlets, located inside the cylindrical air cavity structure, and connected to the air inlet structure at both ends;

[0013] The tuyere structure includes an upper tuyere plate and a lower tuyere plate;

[0014] The cylindrical air cavity structure, the gradient cross-section transition air duct structure and the upper air nozzle plate are integrated to form a blowing body; the lower air nozzle plate is movably connected to one side of the gradient cross-section transition air duct structure;

[0015] Side panels are respectively provided at both ends of the air outlet structure close to the air inlet structure;

[0016] The side panels are provided with width adjustment devices.

[0017] Furthermore, at least one air inlet is provided on the side walls of the two inlet air ducts respectively.

[0018] Furthermore, the air outlet on the internal air outlet structure is a long hole structure, and the long side of the long hole structure is parallel to the central axis of the internal air outlet structure.

[0019] Furthermore, the width of the long hole structure is 2-5% of the diameter of the internal air outlet structure.

[0020] Furthermore, the middle axis of the internal air outlet structure coincides with the middle axis of the cylindrical air cavity structure;

[0021] The outer diameter of the internal air outlet structure is equal to the diameter of the inlet air duct and smaller than the inner diameter of the cylindrical air cavity structure, and an airflow cavity is formed between the internal air outlet structure and the cylindrical air cavity.

[0022] Furthermore, the outer diameter of the internal air outlet structure is 1 / 2-3 / 4 of the inner diameter of the cylindrical air cavity structure.

[0023] Furthermore, the cross-sectional area of ​​the gradually changing cross-section transition air duct structure parallel to the central axis of the internal air outlet structure gradually decreases from the end connected to the cylindrical air cavity structure to the end connected to the air nozzle structure.

[0024] Furthermore, the maximum cross-sectional area of ​​the gradient cross-sectional transition air duct structure is 1.5-3.5 times the minimum cross-sectional area.

[0025] Furthermore, the blowing body is provided with an internal rib plate at the gradient cross-section transition air duct structure.

[0026] Furthermore, the upper nozzle plate is a hook structure, including a flat plate structure and a bent structure, and the angle between the flat plate structure and the bent structure is 100-170°.

[0027] Furthermore, an angle between a line connecting the air outlet and a central axis of the internal air outlet structure and an extension line of the flat plate structure in the upper air nozzle plate is 20-70°.

[0028] Furthermore, the degree of the angle is one of 20°, 21°, 22°, 23°, 24°, 25°, 26°, 27°, 28°, 29°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, and 70°.

[0029] Furthermore, the air outlet is located at an end of the internal air outlet structure away from the air nozzle structure.

[0030] Furthermore, the side panel is provided with a first opening and a second opening;

[0031] The width adjustment device includes a stopper located inside the air outlet structure and an adjustment handle located outside the air outlet structure and connected to the first opening.

[0032] Furthermore, the stopper includes a stopper body and a stopper hook fixedly connected to the stopper body.

[0033] Furthermore, a sliding groove is provided on the adjusting handle, and a sliding slider is provided in the sliding groove.

[0034] Furthermore, the adjustment handle is a hollow structure for accommodating a first telescopic adjustment rod, and the block body is movably connected to the adjustment handle via the first telescopic adjustment rod;

[0035] The stopper hook is connected to the slider via a second telescopic adjustment rod;

[0036] The slider is driven to slide in the sliding groove, driving the block hook and the block body to change the position of the block, thereby adjusting the air outlet width of the air nozzle structure to adapt to the production of films of different specifications.

[0037] Furthermore, the structure of the lower nozzle plate matches the structure of the upper nozzle plate and the structure of the stopper.

[0038] Furthermore, the curvature of the contact surface between the lower nozzle plate and the block is consistent, and the curvature of the contact surface between the upper nozzle plate and the block is consistent, so as to ensure that the air outlet width of the nozzle structure is fixed after adjustment and ensure the sealing of the non-air outlet position.

[0039] Furthermore, a scale is provided on the adjustment handle to achieve precise control of the air outlet width.

[0040] Furthermore, the surface roughness of the surface of the cast film laminating device in contact with the airflow is Ra≤0.05 μm.

[0041] Furthermore, the pressure of the airflow blown out by the cast film laminating device through the air nozzle structure is 1 MPa or less.

[0042] The present invention also provides a film casting device, which comprises a casting die, a casting film, a cooling roller, and the casting film laminating device matched with the cooling roller in the casting direction of the viscous film material.

[0043] The viscous fluid film material is cast from the casting die head through the casting film sheet onto the rotating cooling roller. The casting film sheet laminating device blows air onto the viscous fluid film material cast onto the cooling roller and solidifies it into a film in combination with the cooling roller.

[0044] Furthermore, the direction of the airflow blown out from the cast film laminating device is perpendicular to the tangential direction of the cooling roller.

[0045] Furthermore, the film casting device further comprises a frame, and the casting film laminating device is mounted on the frame via a rotating shaft;

[0046] The rotating shafts are located at both ends of the air inlet structure in the cast film laminating device, and the axes of the two rotating shafts are concentric.

[0047] Furthermore, the bracket is movably adjustable. By adjusting the bracket, the positions of the two rotating shafts are adjusted to ensure that the outer edge of the nozzle structure in the cast film laminating device is parallel to the central axis of the cooling roller, and the distance between the outer edge and the cooling roller is adjusted according to the production of films of different specifications to achieve a good laminating effect.

[0048] Furthermore, the axes of the two rotating shafts coincide with the outer edge of the nozzle structure in the cast film laminating device.

[0049] Furthermore, the cast film sheet is perpendicular to the ground, so that the viscous fluid film material flows onto the cooling roller in a direction perpendicular to the ground.

[0050] The present invention also provides a use of the above-mentioned cast film sheet covering device, which is used to blow out air flow to sweep the surface of the cooling roller when no film casting is performed, thereby achieving the purpose of cleaning the cooling roller without damaging the precursor of the cooling roller surface.

[0051] Furthermore, the purge pressure of the airflow is adjusted according to actual cleaning conditions.

[0052] The beneficial effects of the present invention are:

[0053] 1. The application provides a kind of cast film sheet covering device, according to the direction of airflow, in turn including air inlet structure, air outlet structure;The air inlet structure includes two inlet air pipes, two the inlet air pipe is located at the two sides of the air outlet structure respectively;The air outlet structure according to the direction of airflow, in turn including internal air outlet structure, cylindrical air cavity structure, gradually changing cross section transition air duct structure, air nozzle structure;The gradually changing cross section transition air duct structure one end is connected with the cylindrical air cavity structure, the other end is connected with the air nozzle structure;The internal air outlet structure is the cylindrical structure with intermittent air outlet, is located in the internal cylindrical air cavity structure, both ends are communicated with the air inlet structure;The air nozzle structure includes upper air nozzle plate and lower air nozzle plate;The cylindrical air cavity structure with the gradually changing cross section transition air duct structure and the upper air nozzle plate are integrally designed, and constitute blowing main body;The lower air nozzle plate is movably connected on one side of the gradually changing cross section transition air duct structure;Air outlet structure both ends are equipped with side plate near the air inlet structure respectively;Width adjusting device is equipped on the side plate;

[0054] The application can make airflow more uniform, stable and adjustable to act on the viscous flow film material in the casting state, so that the film material is closely attached to the cooling roller, the defects such as wrinkles and bubbles of the film are reduced, and the attachment quality is improved, which is a technical effect that the traditional positive pressure air knife structure cannot achieve.

[0055] 2. In combination with the cast film sheet covering device of the application, the application provides a kind of film casting device, which includes casting die, cast film sheet, cooling roller and the above-mentioned cast film sheet covering device in turn according to the casting direction of viscous flow film material;The viscous flow film material flows from the casting die to the rotating cooling roller through the cast film sheet, and the viscous flow film material flowing onto the cooling roller is subjected to high-pressure air blowing by the above-mentioned cast film sheet covering device, and is solidified into film in combination with the cooling roller.

[0056] Through the specific structure of the cast film sheet covering device and the fine cooperation between the structures, and the close combination with the process, the film obtained by the application has good film attachment effect, uniform thickness, no obvious light and dark stripes, simple process, reduced production cost, reduced safety hazards existing in manual handling of damaged film during shutdown and other problems.

[0057] 3. The application also provides a use of the cast film sheet covering device, which is used to blow high-pressure airflow to clean the surface of the cooling roller without damaging the surface of the cooling roller. BRIEF DESCRIPTION OF DRAWINGS

[0058] Figure 1 This is a schematic diagram of the overall structure of the cast film laminating device of the present invention from a front perspective;

[0059] Figure 2 This is a schematic structural diagram of the cast film laminating device of the present invention, with the blowing body hidden;

[0060] Figure 3 It is a schematic diagram of the overall structure of the cast film laminating device of the present invention from a three-dimensional perspective from the back side;

[0061] Figure 4 It is a schematic front view of the overall structure of the cast film laminating device of the present invention;

[0062] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure along the BB direction;

[0063] Figure 6 Schematic diagram of the overall structure of the film casting device of the present invention;

[0064] Figure 7 for Figure 6 A partial enlarged view of middle A;

[0065] The names of the labels in the figure are:

[0066] 1. Air inlet structure; 101. Inlet air duct; 102. Air inlet; 2. Air outlet structure; 3. Internal air outlet structure; 301. Air outlet; 4. Cylindrical air cavity structure; 5. Gradual cross-section transition air duct structure; 6. Nozzle structure; 601. Upper nozzle plate; 602. Lower nozzle plate; 603. Bolt; 7. Side panel; 8. Width adjustment device; 801. Block; 802. Adjustment handle; 803. Slider; 804. First telescopic adjustment rod; 805. Second telescopic adjustment rod; 9. Internal rib plate; 10. Casting die; 11. Casting film; 12. Cooling roller; 13. Rotating shaft. DETAILED DESCRIPTION

[0067] Example 1

[0068] like Figures 1-5 As shown, this embodiment provides a cast film laminating device, which includes an air inlet structure 1 and an air outlet structure 2 in sequence according to the direction of air flow;

[0069] The air inlet structure 1 includes two inlet air ducts 101, and the two inlet air ducts 101 are respectively located on both sides of the air outlet structure 2; the two inlet air ducts 101 can effectively perform preliminary sorting and distribution of the large amount of airflow introduced by the air inlet structure 1, so that the airflow has a certain pressure and speed before entering the air outlet structure 2, laying the foundation for further increasing the pressure later; at the same time, the two inlet air ducts 101 can distribute the inlet airflow more evenly and enter the air outlet structure 2 from both sides; it also enables the cast film laminating device to introduce airflow from a larger spatial range, compared with the unilateral air intake of the positive pressure air knife in the prior art, it greatly increases the air intake flow rate, and provides a sufficient air source basis for generating high-pressure airflow; it once again avoids the airflow deflection and uneven pressure that may be caused by unilateral air intake, which ultimately leads to problems such as unstable film quality;

[0070] The air outlet structure 2 includes an internal air outlet structure 3, a cylindrical air cavity structure 4, a gradient cross-section transition air duct structure 5, and an air nozzle structure 6 in sequence according to the direction of the air flow; one end of the gradient cross-section transition air duct structure 5 is connected to the cylindrical air cavity structure 4, and the other end is connected to the air nozzle structure 6;

[0071] The internal air outlet structure 3 is a cylindrical structure provided with an intermittent air outlet 301, which is located inside the cylindrical air cavity structure 4 and is connected to the air inlet structure 1 at both ends; the cylindrical air cavity structure 4 in this embodiment has advantages in guiding the internal airflow and maintaining pressure, and can make the airflow flow more smoothly in the cavity, reduce eddy currents and energy losses, thereby reducing the collision and energy loss of the airflow, and helping to maintain and stabilize a higher air pressure; and the intermittent air outlet 301 can more finely control and regulate the airflow, and can make the airflow distribution more accurate compared with the continuous air outlet in the prior art; according to the principles of fluid mechanics, when the airflow passes through a narrow or intermittent channel, the flow velocity will increase and the pressure will also increase accordingly, thereby helping to increase the pressure of the airflow; at the same time, the intermittent air outlet will have a certain throttling effect on the airflow;

[0072] The tuyere structure 6 includes an upper tuyere plate 601 and a lower tuyere plate 602;

[0073] The cylindrical air cavity structure 4 is integrally designed with the gradually changing cross-section transition air duct structure 5 and the upper air nozzle plate 601 to form a blowing main body; the lower air nozzle plate 602 is movably connected to one side of the gradually changing cross-section transition air duct structure 5; the movable air nozzle structure 6 is designed so that the air outlet angle and area of the air nozzle can be adjusted according to actual needs, which increases the flexibility and adaptability of the device compared with the traditional fixed air nozzle, and better meets the requirements of different cast film sheet coating processes; the opening angle of the air nozzle structure can also be controlled according to the size of the air flow pressure; or the opening angle between the lower air nozzle plate 602 and the upper air nozzle plate 601 is adjusted, and the outlet air flow pressure is controlled again.

[0074] The two ends of the air outlet structure 2 near the air inlet structure 1 are respectively provided with side plates 7; for limiting the lateral diffusion of air flow in the air outlet structure 2, after the air flow enters the air outlet structure 2 from the air inlet structure 1, the side plates 7 enable the air flow to advance along the designed air duct direction, avoiding the air flow to diffuse randomly in the horizontal direction, and ensuring the concentration of the air flow, providing a stable air flow source for subsequent air outlet.

[0075] The side plates 7 are provided with width adjusting devices 8; to adjust the air outlet width of the air nozzle structure 6 to adapt to the production of different specifications of films. The cast film sheet coating device can stabilize the air flow, reduce turbulence, and make the film uniformly pressed on the drum surface and closely attached.

[0076] The embodiment can make the air flow more uniform, stable and adjustable to act on the viscous flow film material in the casting state, so as to better closely coat the film material on the cooling roller, reduce defects such as wrinkles and bubbles of the film, and improve the coating quality, which is a technical effect that the traditional positive pressure air knife structure cannot achieve.

[0077] In the embodiment, the lower air nozzle plate 602 is connected to the blowing main body by bolts 603, and the size of the air opening between the lower air nozzle plate 602 and the upper air nozzle plate 601 is adjusted by loosening or tightening. In some embodiments, the lower air nozzle plate 602 is movably connected to the blowing main body by a hinge, a rotating shaft or a sliding connection.

[0078] In the embodiment, one air inlet 102 is arranged on the side wall of each of the two inlet air pipes 101; in some embodiments, at least one air inlet 102 is arranged on the side wall of each of the two inlet air pipes 101; the air inlet area is greatly increased, and more air flow can enter in unit time. This provides a more sufficient air source for generating high-pressure and high-speed air flow, thereby meeting the requirements of large-scale industrial production lines for cast film, so as to achieve the purpose of rapid film formation.

[0079] In this embodiment, the air outlet 301 on the internal air outlet structure 3 is a long hole structure, and the long side of the long hole structure is parallel to the central axis of the internal air outlet structure 3; the width of the long hole structure is 2% of the diameter of the internal air outlet structure 3, and is evenly arranged axially on the cylindrical air cavity structure 4. In some embodiments, the width of the long hole structure is any value between 2% and 5% of the diameter of the internal air outlet structure 3; the airflow is guided by the shape of the long hole when flowing out, and since the long side direction of the long hole is parallel to the central axis of the internal air outlet structure 3, the airflow mainly flows out along the central axis direction, forming an axial airflow guide. This guiding effect can reduce the scattering and turbulence of the airflow during outflow, allowing the airflow to flow more concentratedly in the predetermined direction. It can also make the airflow more evenly distributed in the axial direction. Since the long hole extends along the central axis, the airflow will form a relatively uniform pressure distribution in the circumferential direction when it flows out. Compared with some local openings or continuous openings in the existing air outlet design, the long hole structure avoids the situation where the local pressure is too high or too low due to the concentration of the opening position. At the same time, the air outlets evenly arranged along the axial direction can evenly output the airflow to the gradient cross-section transition duct structure 5 in the axial direction, ensuring the uniformity of the air pressure in the axial direction. If the width of the long hole structure is too large, since the airflow enters from both sides, most of the airflow will directly reach the gradient cross-section transition duct structure 5 from the long holes on both sides, and thus will not reach the axial middle part.

[0080] The middle axis of the internal air outlet structure 3 coincides with the middle axis of the cylindrical air cavity structure 4;

[0081] The outer diameter of the internal air outlet structure 3 is equal to the diameter of the inlet air duct 101 and is smaller than the inner diameter of the cylindrical air cavity structure 4, and an airflow cavity is formed between the internal air outlet structure 3 and the cylindrical air cavity structure 4; compared with air cavities of other shapes, the cylindrical airflow cavity formed in this embodiment has a more stable structure when subjected to internal airflow pressure, and can better maintain the air pressure in the cavity and avoid excessive loss of pressure, thereby providing a stable environment for obtaining high-pressure airflow.

[0082] In this embodiment, the outer diameter of the internal air outlet structure 3 is 3 / 4 of the inner diameter of the cylindrical air cavity structure 4; in some embodiments, the outer diameter of the internal air outlet structure 3 is any value within the range of 1 / 2-3 / 4 of the inner diameter of the cylindrical air cavity structure 4. After the airflow flowing out of the internal air outlet structure 3 enters the cylindrical air cavity structure 4, due to the sudden expansion of the space, according to Bernoulli's principle, the speed of the airflow will decrease and the pressure will increase. This conversion of speed and pressure is a gradual process. A suitable ratio can enable the airflow to effectively achieve this conversion after entering the cylindrical air cavity structure 4, avoiding energy loss or turbulence caused by excessively drastic spatial changes; if the ratio is too small, the airflow may be concentrated in the central area after entering the cylindrical air cavity structure 4, making it difficult to fully utilize the entire cylindrical air cavity structure 4 space, resulting in uneven airflow distribution; and if the ratio is too large, the airflow may become turbulent due to collision with the wall of the cylindrical air cavity structure 4 when entering the cylindrical air cavity structure 4. In the ratio range of 1 / 2 - 3 / 4, the airflow can be diffused more evenly from the internal air outlet structure 3 to the surroundings, and can achieve better distribution in both the circumferential direction and the axial direction of the cylindrical air cavity structure 4.

[0083] The cross-sectional area of ​​the gradient cross-sectional transition duct structure 5 parallel to the central axis of the internal air outlet structure 3 gradually decreases from the end connected to the cylindrical air cavity structure 4 to the end connected to the air nozzle structure 6; the design of the gradient cross-sectional area makes the cross-sectional area of ​​the duct gradually decrease. According to the fluid continuity equation, when the gas flows in the gradient cross-sectional transition duct structure 5, the cross-sectional area decreases and the flow rate increases; therefore, when the airflow passes through the channel of the gradient cross-sectional transition duct structure 5, the flow rate will gradually increase, thereby accelerating the airflow and preparing for the formation of high-pressure airflow; and its gradient cross-sectional area The design can achieve a smooth transition and acceleration of the airflow; in the prior art, the air duct structure is often of a uniform cross-section or a simple shape, while the design of the gradually variable cross-section in this embodiment can more effectively guide the high-pressure airflow in the cylindrical air cavity structure 4 to the wind nozzle structure, and further increase the airflow speed and pressure, which is an innovation in the air duct design; it can also further effectively convert the relatively stable high-pressure airflow in the cylindrical air cavity structure 4 into a high-speed and high-pressure airflow, and transmit it to the wind nozzle structure 6, thereby achieving a further increase and conversion of the pressure, and ensuring that the airflow finally blown out has a higher pressure.

[0084] In this embodiment, the maximum value of the cross-sectional area of ​​the gradient cross-sectional transition duct structure 5 is 2 times the minimum value of the cross-sectional area. In some embodiments, the maximum value of the cross-sectional area of ​​the gradient cross-sectional transition duct structure 5 is any value in the range of 1.5-3.5 times the minimum value of the cross-sectional area. When the airflow enters the gradient duct from one end with a larger cross-sectional area, as the cross-sectional area gradually becomes smaller, the airflow velocity will gradually accelerate, thereby increasing the kinetic energy of the airflow and the pressure, thereby producing a high-pressure effect; similarly, if the cross-sectional area changes too drastically, for example, the multiple is too large, the airflow will experience a large speed change in a short period of time, which is prone to turbulence, while if the cross-sectional area changes too gently, it cannot achieve the purpose of pressurizing and accelerating the airflow.

[0085] The blowing body is provided with an internal rib plate 9 at the gradient cross-section transition duct structure 5; because the gradient cross-section transition duct structure 5 will be subjected to the pressure of the internal airflow during operation, especially in the area where the cross-sectional area changes, the pressure distribution is uneven and stress concentration is likely to occur. In this embodiment, the specific arrangement of the internal rib plate 9 can effectively enhance the structural strength of this area, connect the wall surfaces of the duct structure, and reduce the degree of deformation of the wall surfaces by bearing and dispersing pressure; it can also prevent the gradient cross-section transition duct structure 5 from being deformed or damaged under the action of high-pressure airflow for a long time, thereby reducing the maintenance cost and downtime caused by structural damage; at the same time, the presence of the internal rib plate 9 can guide the airflow. When the airflow passes through the gradient cross-section transition duct structure 5, the internal rib plate 9 will change the local flow direction of the airflow, so that the airflow is more in line with the design direction of the duct, especially in the area where the cross-sectional shape of the duct changes, the airflow is prone to turbulence, and the internal rib plate 9 can comb the airflow neatly to avoid deflection or vortex in the airflow. In addition, since the axial length of the air duct is relatively large, in order to ensure the consistency of the air outlet size to the greatest extent, the internal ribs 9 will play a role in increasing support and minimizing deformation during the processing.

[0086] In this embodiment, the upper nozzle plate 601 is an "eagle-beak" hook structure, including a flat structure and a bent structure. After the airflow is blown out from the gradient cross-section transition duct structure 5, it first contacts the flat structure, and then changes direction under the guidance of the bent structure; due to the existence of the bent structure, the airflow produces a convergence effect to a certain extent. When the airflow passes through the bend, the streamline will bend toward the inside of the bend, thereby making the airflow more concentrated in the local area.

[0087] In the embodiment, the angle between the flat plate structure and the bent structure is 120°, and in some embodiments, the angle between the flat plate structure and the bent structure is any value in the range of 100-170°. A larger angle (close to 170°) allows the air flow to be blown out at a relatively gentle angle when the air nozzle structure 6 is close to the film, avoiding excessive impact force due to an excessively steep angle, which can damage the film or cause the film to wrinkle. A smaller angle (close to 100°) is suitable for a situation where the working distance is far, and can allow the air flow to maintain a certain converging effect and impact force at a farther distance to meet different working requirements. In some embodiments, a way of changing the angle to adjust the coverage range can be designed, and in combination with the movable connection of the lower air nozzle plate 602, the output form of the air flow can be adjusted more finely to achieve air flow with more stable output pressure rate, thereby ensuring the quality of the film formed by the film material again.

[0088] In the embodiment, the included angle α between the line connecting the air outlet 301 and the center axis of the internal air outlet structure 3 and the extension line of the flat plate structure in the upper air nozzle plate 601 is 30°; in some embodiments, the degree of the included angle α can also be any one of 20°, 21°, 22°, 23°, 24°, 25°, 26°, 27°, 28°, 29°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°. That is, the position of the air outlet 301 allows the air flow to enter from both sides and then pass through the gradually changing cross-section transition air duct structure 5, and the air flow follows the cylindrical air cavity structure 4 to adjust the direction to form stable air flow.

[0089] In the embodiment, the position of the air outlet 301 is located at the end of the internal air outlet structure 3 away from the air nozzle structure 6; this makes the flow path of the air flow in the cylindrical air cavity structure 4 longer, and can also to some extent avoid the premature damage of the air outlet structure 2 caused by direct impact of the air flow, thereby prolonging the service life.

[0090] The side plate 7 is provided with a first opening and a second opening;

[0091] The width adjusting device 8 includes a stop block 801 located inside the air outlet structure 2 and an adjusting handle 802 connected with the first opening on the outside of the air outlet structure 2.

[0092] The stop block 801 includes a stop block main body and a stop block hook fixedly connected with the stop block main body.

[0093] The adjusting handle 802 is provided with a sliding groove, and a sliding block 803 is arranged in the sliding groove.

[0094] The adjustment handle 802 is a hollow structure for accommodating the first telescopic adjustment rod 804. The block body is movably connected to the adjustment handle 802 via the first telescopic adjustment rod 804.

[0095] The stopper hook is connected to the slider 803 via a second telescopic adjustment rod 805;

[0096] The slider 803 is driven to slide in the sliding groove, driving the block hook and the block body to move together, changing the position of the block 801, and then adjusting the air outlet width of the air nozzle structure 6 to adapt to the production of films of different specifications;

[0097] The ability to finely adjust the air outlet width allows the cast film laminating device to adapt to a variety of different operating requirements. Whether requiring high-speed, low-flow, fine airflow or low-speed, high-flow, large-area airflow, both can be achieved by adjusting the air outlet width. Furthermore, this adjustment method can accommodate a variety of conditions, such as varying air source pressures and outlet temperatures, making the device functional in a variety of complex industrial environments.

[0098] The structure of the lower nozzle plate 602 matches the structure of the upper nozzle plate 601 and the structure of the block 801; the block 801 can form a stable support for the nozzle structure 6 in the adjusted position to prevent the position of the lower nozzle plate 602 from moving due to the pressure of the air flow or other external factors, thereby ensuring that the air outlet width remains stable during operation.

[0099] In this embodiment, the curvature of the contact surface between the lower nozzle plate 602 and the block 801 is consistent, and the curvature of the contact surface between the upper nozzle plate 601 and the block 801 is consistent, so as to ensure that the air outlet width of the nozzle structure 6 is fixed after adjustment and ensure the sealing of the non-air outlet area, that is, when the curvature of the contact surface between the nozzle structure 6 and the block 801 is tightly fitted, it can effectively prevent the airflow from leaking from the non-air outlet area, so that the airflow is concentrated and blown out from the adjusted air outlet width area, thereby improving the utilization efficiency of the airflow.

[0100] In this embodiment, a scale is further provided on the adjustment handle 802 to achieve more precise control of the air outlet width.

[0101] Example 2

[0102] like Figures 1-7 As shown, this embodiment also provides a film casting device, which includes a casting die 10, a casting film 11, a cooling roller 12, and the casting film laminating device of embodiment 1 matched with the cooling roller 12 in the casting direction of the viscous film material.

[0103] The viscous fluid film material is cast from the casting die through the casting film 11 onto the rotating cooling roller 12. The casting film laminating device performs high-pressure blowing on the viscous fluid film material cast onto the cooling roller 12, and solidifies it into a film in combination with the cooling roller 12.

[0104] like Figure 7 As shown, the direction of the airflow from the cast film laminating device is perpendicular to the tangential direction of the cooling roller 12. The airflow exerts a pressure perpendicular to the surface of the cast viscous film material on the cooling roller 12, effectively pressing the cooling film tightly against the surface of the cooling roller 12. Furthermore, according to the principle of pressure, the vertical pressure helps to overcome any small gaps or air layers that may exist between the film and the cooling roller 12, thereby achieving a closer fit between the film and the cooling roller 12. In some embodiments, the airflow direction is adjustable within a range of 15° from the vertical to accommodate the production needs of a wider range of films.

[0105] The film casting device further comprises a frame, and the casting film laminating device is mounted on the frame via a rotating shaft 13;

[0106] The rotating shafts 13 are located at both ends of the air inlet structure 1 in the cast film laminating device, and the axes of the two rotating shafts 13 are concentric.

[0107] In this embodiment, the bracket is movable and adjustable. By adjusting the bracket, the position of the two rotating shafts 13 is adjusted to ensure that the outer edge of the nozzle structure 6 in the cast film laminating device is parallel to the central axis of the cooling roller 12. At the same time, by adjusting the position of the bracket, the position of the nozzle structure 6 in the cast film laminating device is adjusted so that the airflow blown out from the nozzle structure 6 effectively acts on the bottom where the film and the cooling roller 12 are in contact. If the distance is too far, the film and the cooling roller 12 will be in contact for too long, and substances such as air will be wrapped between the film and the cooling roller 12, and thus cannot be effectively removed, affecting the flatness and other qualities of the film. The above-mentioned adjustment angles and positions need to be adjusted at any time according to the actual conditions of the film produced, so that the film casting device can adapt to different film production lines.

[0108] The distance between the outer edge and the cooling roller 12 is adjusted to achieve optimal lamination according to the film specifications being produced. Too much distance reduces the airflow pressure on the film, widens the airflow range, and traps air between the film and the cooling roller 12. Too little distance leads to excessively concentrated airflow pressure, causing the airflow to flow onto the film in a streamlined manner, potentially blowing away any unformed film.

[0109] In this embodiment, the axes of the two rotating shafts 13 coincide with the outer edges of the nozzle structure 6 in the cast film laminating device.

[0110] Furthermore, during the casting process, the casting film in this embodiment is perpendicular to the ground, so that the viscous film material flows onto the cooling roller 12 in a direction perpendicular to the ground.

[0111] In this embodiment, the cast film laminating device is further configured to blow air to purge the surface of the cooling roller 12 when film casting is not in progress, thereby cleaning the cooling roller 12 without damaging the surface of the cooling roller 12. In a specific implementation, the purge pressure of the air flow is adjusted according to the actual cleaning situation.

[0112] In summary, through the film casting device in this embodiment, through the specific structure of the cast film sheet laminating device and the fine coordination between the various structures, as well as the close integration with the process, the film obtained in this embodiment has good film laminating effect, uniform thickness, no obvious light and dark stripes, and a simple process, reducing production costs and reducing safety hazards that exist when manual processing of damaged films is stopped.

[0113] It should be understood that the present invention is not limited to the contents and structures described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A cast film laminating device, characterized in that: According to the direction of airflow, it includes an air inlet structure (1) and an air outlet structure (2); The air inlet structure (1) comprises two inlet air ducts (101), and the two inlet air ducts (101) are respectively located on both sides of the air outlet structure (2); The air outlet structure (2) includes, in order according to the direction of the air flow, an internal air outlet structure (3), a cylindrical air cavity structure (4), a gradient cross-section transition air duct structure (5), and an air nozzle structure (6); one end of the gradient cross-section transition air duct structure (5) is connected to the cylindrical air cavity structure (4), and the other end is connected to the air nozzle structure (6); The internal air outlet structure (3) is a cylindrical structure provided with an intermittent air outlet (301), located inside the cylindrical air cavity structure (4), and connected to the air inlet structure (1) at both ends; The tuyere structure (6) comprises an upper tuyere plate (601) and a lower tuyere plate (602); The cylindrical air cavity structure (4), the gradually changing cross-section transition air duct structure (5), and the upper air nozzle plate (601) are designed as an integrated whole to form a blowing body; the lower air nozzle plate (602) is movably connected to one side of the gradually changing cross-section transition air duct structure (5); Side panels (7) are respectively provided at both ends of the air outlet structure (2) near the air inlet structure (1); A width adjustment device (8) is provided on the side plate (7).

2. The cast film laminating device according to claim 1, characterized in that: At least one air inlet (102) is respectively provided on the side walls of the two inlet air ducts (101).

3. The cast film laminating device according to claim 1, characterized in that: The air outlet (301) on the internal air outlet structure (3) is a long hole structure, and the long side of the long hole structure is parallel to the central axis of the internal air outlet structure (3).

4. The cast film laminating device according to claim 1, characterized in that: The side plate (7) is provided with a first opening and a second opening; The width adjustment device (8) comprises a stopper (801) located inside the air outlet structure, and an adjustment handle (802) located outside the air outlet structure (2) and connected to the first opening.

5. The cast film laminating device according to claim 4, characterized in that: The stopper (801) comprises a stopper body and a stopper hook fixedly connected to the stopper body.

6. The cast film laminating device according to claim 5, characterized in that: The adjusting handle (802) is provided with a sliding groove, and a sliding block (803) is provided in the sliding groove.

7. The cast film laminating device according to claim 6, characterized in that: The adjustment handle (802) is a hollow structure for accommodating a first telescopic adjustment rod (804), and the block body is movably connected to the adjustment handle (802) via the first telescopic adjustment rod (804); The stopper hook is connected to the slider (803) via a second telescopic adjustment rod (805).

8. A film casting device, characterized in that The method comprises, in order of the casting direction of the viscous flow film material, a casting die head (10), a casting film (11), a cooling roller (12), and a casting film laminating device according to any one of claims 1 to 7 matched with the cooling roller (12); The viscous fluid film material is cast from the casting die (10) through the casting film (11) onto the rotating cooling roller (12); the casting film laminating device blows air onto the viscous fluid film material cast onto the cooling roller (12), and solidifies it into a film in combination with the cooling roller (12).

9. The film casting device according to claim 8, characterized in that: The film casting device further comprises a frame, and the film casting film laminating device is mounted on the frame via a rotating shaft (13); The rotating shafts (13) are located at both ends of the air inlet structure (1) in the cast film laminating device, and the axes of the two rotating shafts (13) are concentric.

10. The film casting device according to claim 9, characterized in that: The axes of the two rotating shafts (13) coincide with the outer edge of the nozzle structure (6) in the cast film laminating device.

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