Casting diaphragm pasting device, thin film casting device and application

Abstract

The invention relates to the technical field of cast film production, in particular to a cast film pasting device, a thin film casting device and application. The curtain coating film pasting device sequentially comprises an air inlet structure and an air outlet structure according to the airflow trend. The air outlet structure sequentially comprises an internal air outlet structure, a cylindrical air cavity structure, a transition air duct structure with a gradually-changed section and an air nozzle structure according to the airflow trend. Side plates are arranged at the positions, close to the air inlet structure, of the two ends of the air outlet structure correspondingly. A width adjusting device is arranged on the side plate; by means of the unique design and matching of the air inlet structure and the air outlet structure of the casting film pasting device, airflow can act on a viscous flow state film material in a casting state more uniformly, stably and adjustably, so that the film material is better and tightly pasted on a cooling roller, the defects of wrinkles, bubbles and the like of a film are reduced, and the service life of the film is prolonged. And the pasting quality is improved.

Description

Technical Field

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

[0002] When producing film products, the high-temperature melt flows out through the die head to form a high-temperature cast film. The film needs to be attached to the cooling roller to quickly cool the film to obtain a thick plastic sheet for subsequent processes. The close fit between the molten material and the surface of the cooling roller is the key to the formation of cast film.

[0003] The coating effect of the 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 has high requirements on the structure of the wind knife, and it must be able to ensure the stability of the air outlet of the wind nozzle. For example, CN110628219B discloses a manufacturing process for polyphenylene sulfide film, which uses sodium hydrosulfide, sodium hydroxide, p-dichlorobenzene, and hexachlorobenzene as raw materials, and N-methyl-2-pyrrolidone as solvent to condense and synthesize polyphenylene sulfide resin; the polyphenylene sulfide resin is purified-washed-dried-extrusion granulation-devolatilization drying-melt extrusion-melt metering-melt forced filtration-T-type mold-casting roller-wind knife, vacuum channel-cooling roller-thickness gauge-shaping-electrostatic attachment-rolled into an attached polyphenylene sulfide film roll, and its thickness is mainly controlled by the pressure and wind speed of the wind blown by the wind knife at the outlet of the T-type mold, and the pressure and speed of the wind blown by the wind knife are adjusted according to the needs of manufacturing polyphenylene sulfide film. Positive pressure air knife is one of the more important equipment on the casting machine. It makes the film close to the casting roller by blowing out a positive pressure airflow. However, the existing positive pressure air knife has concentrated air volume, difficult to control wind speed, and uncontrollable wind temperature, which leads to too fast cooling of the casting base film and too many spherulites in the film. At the same time, the film surface will have a high haze due to the difference in the degree of rapid cooling, forming continuous stripes with low longitudinal transparency on the film surface, or light and dark stripes caused by uneven thickness, uneven thickness, etc. In addition, due to the unstable airflow, the film material on the cooling roller will also be sputtered onto or inside the positive pressure air knife. Since the positive pressure air knife needs to be cleaned and maintained regularly, the efficiency of film casting is reduced and the production cost is increased.

[0005] In the actual production process, the configured air knife will also be used in conjunction with the vacuum box, using the vacuum principle to remove the air between the film and the casting roller, so that no bubbles will be generated between the film and the casting roller. When the air knife is operated, the air volume of the air knife should be controlled appropriately. If the air volume is too large, the molten film will vibrate excessively, causing the film thickness deviation to increase; if the air volume is too small, the pressure is insufficient, the roller sticking effect becomes worse, the film will produce lateral fluctuations, the film thickness deviation is large, and the film surface is deformed and uneven and cannot be produced. At the same time, the operation of the vacuum box mainly pays attention to adjusting the exhaust wind speed to match the actual production conditions. If the exhaust wind speed is too large, the molten film is prone to holes; if the exhaust wind speed is too small, it will not be able to remove the air between the film and the casting roller. When producing products of the same thickness, the vacuum box with a faster production speed has a higher wind speed than the slower production speed; at the same production speed, the vacuum box with a thicker product has a higher wind speed than the thinner product. It is necessary to strictly control the related operations of the air knife and the vacuum box, which once again increases the process difficulty, resulting in a lower qualified rate of finished products and higher production costs.

[0006] Another example is CN204019832U, which is a positive pressure air knife device suitable for the production of lithium battery cast base film, including an outer air duct, an intermediate air duct and an inner air duct into which high-pressure air flows in sequence. The outer wall of the outer air duct is attached with a heating mechanism, and the inner air duct is integrally processed and formed in a water drop-shaped structure with a cross-sectional area from large to small. The opening end of the inner air duct is provided with a blowing nozzle, and the blowing nozzle is evenly provided with a plurality of adjusting bolts for adjusting the opening of the air outlet. The blowing nozzle is a duckbill structure, and the blowing nozzle includes an upper lip edge and a lower lip edge of the blowing nozzle, and the upper lip edge of the blowing nozzle is longer than the lower lip edge of the blowing nozzle. However, in this technical solution, the inner walls of the outer air duct, the intermediate air duct and the inner air duct are ground and polished to form a super-mirror roughness, so that the incoming airflow can flow out smoothly, thereby ensuring the stability of the airflow inflow. However, to obtain a super-mirror structure with a surface roughness of Ra≤0.01μm, extremely high precision requirements are placed on the processing equipment. For example, during the grinding and polishing process, grinding tools and polishing tools with nanometer-level precision are required. The manufacturing process of these tools themselves is complex and costly. In addition, during the processing, factors such as slight vibrations and temperature changes of the equipment will affect the processing accuracy. Even for the most advanced CNC machine tools, it is very difficult to maintain stable operation for a long time at such a high level of precision.

[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 a device 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 technologies, 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, excessively 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 comprises an air inlet structure and an air outlet structure in sequence according to the air flow direction; 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; The air outlet structure includes an internal air outlet structure, a cylindrical air cavity structure, a gradually variable 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 gradually variable 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; 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; The tuyere structure comprises an upper tuyere plate and a lower tuyere plate; The cylindrical air cavity structure, the gradually changing 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 gradually changing cross-section transition air duct structure; Side panels are respectively provided at both ends of the air outlet structure near the air inlet structure; The side panels are provided with width adjustment devices.

[0010] Furthermore, at least one air inlet is respectively provided on the side walls of the two inlet air ducts.

[0011] 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.

[0012] Furthermore, the width of the long hole structure is 2-5% of the diameter of the internal air outlet structure.

[0013] Furthermore, the middle axis of the internal air outlet structure coincides with the middle axis of the cylindrical air cavity structure; The outer diameter of the internal air outlet structure is equal to the diameter of the inlet air duct and is smaller than the inner diameter of the cylindrical air cavity structure, and an airflow air cavity is formed between the internal air outlet structure and the cylindrical air cavity.

[0014] 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.

[0015] Furthermore, the cross-sectional area of ​​the gradually variable 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.

[0016] Furthermore, the maximum cross-sectional area of ​​the gradually varying cross-sectional transition air duct structure is 1.5-3.5 times the minimum cross-sectional area.

[0017] Furthermore, the blowing body is provided with an internal rib plate at the gradually changing cross-section transition air duct structure.

[0018] 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°.

[0019] Furthermore, the angle between the line connecting the air outlet and the central axis of the internal air outlet structure and the extension line of the flat plate structure in the upper air nozzle plate is 20-70°.

[0020] 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°.

[0021] Furthermore, the air outlet is located at an end of the internal air outlet structure away from the air nozzle structure.

[0022] Furthermore, the side plate is provided with a first opening and a second opening; 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.

[0023] Furthermore, the stopper includes a stopper body and a stopper hook fixedly connected to the stopper body.

[0024] Furthermore, a sliding groove is provided on the adjusting handle, and a slidable slider is provided in the sliding groove.

[0025] 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; The stopper hook is connected to the slider via a second telescopic adjustment rod; 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 flow in the air nozzle structure to adapt to the production of films of different specifications.

[0026] Furthermore, the structure of the lower nozzle plate matches the structure of the upper nozzle plate and the structure of the stopper.

[0027] Furthermore, the curvature of the contact surface between the lower air nozzle plate and the block is consistent, and the curvature of the contact surface between the upper air nozzle plate and the block is consistent, so as to ensure that the air outlet width of the air nozzle structure is fixed after adjustment and ensure the sealing of the non-air outlet position.

[0028] Furthermore, a scale is provided on the adjustment handle to achieve precise control of the air outlet width.

[0029] Furthermore, the surface roughness of the surface of the cast film laminating device in contact with the airflow is Ra≤0.05 μm.

[0030] Furthermore, the pressure of the airflow blown out by the cast film laminating device through the air nozzle structure is 1 MPa or less.

[0031] The present invention also provides a film casting device, which comprises a casting die head, a casting film sheet, a cooling roller, and the casting film sheet laminating device matched with the cooling roller in order according to the casting direction of the viscous flow film material; 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 to the viscous fluid film material cast onto the cooling roller and solidifies it into a film in combination with the cooling roller.

[0032] Furthermore, the direction of the airflow blown out from the cast film laminating device is perpendicular to the tangent direction of the cooling roller.

[0033] Furthermore, the film casting device further comprises a frame, and the casting film sheet laminating device is mounted on the frame via a rotating shaft; The rotating shafts are located at two ends of the air inlet structure in the cast film laminating device, and the axes of the two rotating shafts are concentric.

[0034] 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.

[0035] Furthermore, the axes of the two rotating shafts coincide with the outer edge of the nozzle structure in the cast film laminating device.

[0036] Furthermore, the cast film sheet is perpendicular to the ground, so that the viscous film material flows onto the cooling roller in a direction perpendicular to the ground.

[0037] The present invention also provides a use of the above-mentioned cast film coating 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 surface of the cooling roller.

[0038] Furthermore, the purge pressure of the airflow is adjusted according to actual cleaning conditions.

[0039] The beneficial effects of the present invention are: 1. The present invention provides a cast film laminating device, which comprises an air inlet structure and an air outlet structure in sequence according to the direction of air flow; the air inlet structure comprises two inlet air ducts, and the two inlet air ducts are respectively located on both sides of the air outlet structure; the air outlet structure comprises 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 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; 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; the air nozzle structure comprises an upper air nozzle plate and a lower air nozzle plate; the cylindrical air cavity structure, the gradient cross-section transition air duct structure and the upper air nozzle plate are integrated into a design to constitute a blowing body; the lower air nozzle plate is movably connected to one side of the gradient cross-section transition air duct structure; side panels are respectively provided at both ends of the air outlet structure near the air inlet structure; a width adjustment device is provided on the side panels; The present invention designs and coordinates the above-mentioned unique air inlet structure and air outlet structure of the cast film laminating device, so that the airflow can act on the viscous flow film material in the cast state more evenly, stably and adjustably, so as to better adhere the film material to the cooling roller tightly, reduce the film's wrinkles, bubbles and other defects, and improve the laminating quality. This is a technical effect that is difficult to achieve with the traditional positive pressure air knife structure; 2. In combination with the cast film sheet pasting device of the present invention, the present invention provides a film casting device, which comprises a casting die, a casting film, a cooling roller, and the casting film sheet pasting device matched with the cooling roller in order according to the casting direction of the viscous fluid film material; the viscous fluid film material is cast from the casting die through the casting film onto the rotating cooling roller, and the casting film sheet pasting device performs high-pressure blowing on the viscous fluid film material cast onto the cooling roller, and solidifies it into a film in combination with the cooling roller; Through the film casting device of the present invention, through the specific structure of the casting film sheet pasting device and the fine coordination between the structures, and the close combination with the process, the film obtained by the present invention has good film pasting effect, uniform thickness, no obvious light and dark stripes, and simple process, reducing production costs, reducing the safety hazards existing in the manual shutdown treatment of damaged films, and other problems; 3. The present invention also provides a use of a cast film coating device, which is used to blow out a high-pressure airflow to perform high-pressure sweeping on the surface of the cooling roller when no film casting is performed, so as to achieve the purpose of cleaning the cooling roller without damaging the surface of the cooling roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the overall structure of the cast film laminating device of the present invention from a front three-dimensional angle; Figure 2 It is a schematic diagram of the structure of the cast film laminating device of the present invention behind the hidden blowing body; 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 back side; Figure 4 It is a schematic diagram of the overall structure of the cast film laminating device of the present invention; Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure along the BB direction; Figure 6 It is a schematic diagram of the overall structure of the film casting device of the present invention; Figure 7 for Figure 6 A partial enlarged view of middle A; The names of the labels in the figure are: 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. Gradient cross-section transition air duct structure; 6. Air nozzle structure; 601. Upper air nozzle plate; 602. Lower air nozzle plate; 603. Bolt; 7. Side plate; 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

[0041] Example 1 like Figure 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 air flow direction; 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 a large amount of airflow introduced by the air inlet structure 2, so that the airflow has a certain pressure and speed before entering the air outlet structure 2, laying a 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, and 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; The air outlet structure 2 includes an internal air outlet structure 3, a cylindrical air cavity structure 4, a gradually variable cross-section transition air duct structure 5, and an air nozzle structure 6 in sequence according to the air flow direction; one end of the gradually variable 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 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 losses of the airflow, and helping to maintain and stabilize a higher air pressure; and the intermittent air outlet 301 can control and adjust the airflow more finely, 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 rate will increase and the pressure will increase accordingly, which will help to increase the pressure of the airflow; at the same time, the intermittent air outlet will have a certain throttling effect on the airflow; The air nozzle structure 6 includes an upper air nozzle plate 601 and a lower air nozzle plate 602; The cylindrical air cavity structure 4 is integrated with the gradient cross-section transition air duct structure 5 and the upper air nozzle plate 601 to form a blowing body; the lower air nozzle plate 602 is movably connected to one side of the gradient cross-section transition air duct structure 5; the movable air nozzle structure 6 is designed so that the air outlet angle and air outlet area of ​​the air nozzle can be adjusted according to actual needs. Compared with the traditional fixed air nozzle, the flexibility and adaptability of the device are increased, and the requirements of different cast film laminating processes can be better met; 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 can be adjusted by movability to control the pressure of the outlet air flow again; Side panels 7 are respectively provided at both ends of the air outlet structure 2 near the air inlet structure 3; they are used to limit the lateral diffusion of the airflow in the air outlet structure 2. After the airflow enters the air outlet structure 2 from the air inlet structure 1, the side panels 7 enable the airflow to move along the designed air duct direction, avoiding the airflow from randomly diffusing in the horizontal direction, ensuring the concentration of the airflow, and providing a stable airflow source for subsequent air outlets; The side plate 7 is provided with a width adjustment device 8, which is used to adjust the outlet width of the airflow in the air nozzle structure 6 to adapt to the production of films of different specifications. The cast film laminating device can stabilize the airflow, reduce turbulence, and make the film evenly pressed on the drum surface and adhere tightly.

[0042] This embodiment designs and coordinates the above-mentioned unique air inlet structure 1 and air outlet structure 2 for the cast film laminating device, which can make the airflow act on the viscous flow film material in the cast state more evenly, stably and adjustably, so as to better and tightly adhere the film material to the cooling roller, reduce the film's defects such as wrinkles and bubbles, and improve the laminating quality. This is a technical effect that is difficult to achieve with the traditional positive pressure air knife structure.

[0043] In this embodiment, the lower nozzle plate 602 is connected to the blowing body by means of bolts 603, and the size of the air outlet between the lower nozzle plate 602 and the upper nozzle plate 601 is adjusted by loosening or tightening. In some embodiments, the lower nozzle plate 602 is connected to the blowing body by means of an active connection such as a hinge, a rotating shaft or a sliding connection.

[0044] In this embodiment, an air inlet 102 is respectively provided on the side wall of the two inlet air ducts 101; in some embodiments, at least one air inlet 102 is respectively provided on the side wall of the two inlet air ducts 101; the air intake area is greatly increased, and more airflow can enter per unit time. This provides a more sufficient air source for generating high-pressure and high-speed airflow, thereby meeting the requirements of large-scale industrial production lines for cast films, so as to achieve the purpose of rapid film formation.

[0045] 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. 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 when it flows out, so that the airflow can 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 prior art, 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 output the airflow evenly in the axial direction to the gradient cross-section transition duct structure 5, 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 cannot reach the middle part of the axial direction.

[0046] The middle axis of the internal air outlet structure 3 coincides with the middle axis of the cylindrical air cavity structure 4; 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 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.

[0047] 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 from the internal air outlet structure 3 enters the cylindrical air cavity structure 4, due to the sudden expansion of the space, according to the Bernoulli principle, the speed of the airflow will decrease, and the pressure will increase. This conversion of speed and pressure is a gradual process. The appropriate ratio can enable the airflow to effectively achieve this conversion after entering the air cavity, avoiding energy loss or turbulence caused by excessive spatial changes; if the ratio is too small, the airflow may be concentrated in the central area after entering the air cavity, making it difficult to fully utilize the entire air cavity space, resulting in uneven airflow distribution; and if the ratio is too large, the airflow may be turbulent when entering the air cavity due to collision with the air cavity wall. In the range of 1 / 2-3 / 4, the airflow can be diffused more evenly from the internal air outlet structure 3 to the surroundings, and a good distribution can be achieved in both the circumferential direction and the axial direction of the air cavity.

[0048] The cross-sectional area of ​​the gradient cross-section 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 wind nozzle structure 6; the design of the gradient cross-section makes the cross-sectional area of ​​the duct gradually decrease. According to the fluid continuity equation, when the gas flows in the gradient cross-section 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-section transition duct structure 5, the flow rate will gradually increase, so that the airflow is accelerated to prepare for the formation of high-pressure airflow; and its gradient cross-section design can achieve a smooth transition and acceleration of the airflow; in the prior art, the air duct structure is often of equal cross-section or simple shape, while the design of the gradient cross-section in this embodiment can more effectively guide the high-pressure airflow in the air cavity 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, ensuring that the final blown airflow has a higher pressure.

[0049] In this embodiment, the maximum value of the cross-sectional area of ​​the gradient cross-section transition air duct structure 5 is twice 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 air 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 air duct from one end of the larger cross-sectional area, as the cross-sectional area gradually becomes smaller, the airflow velocity will gradually increase, thereby increasing the kinetic energy of the airflow, and the pressure will also increase accordingly, 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 the cross-sectional area changes too gently and cannot achieve the purpose of pressurizing and accelerating the airflow.

[0050] The blowing body is provided with an internal rib plate 9 at the location of the gradually changing cross-section transition duct structure 5; because the gradually changing 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 the pressure; it can also prevent the gradually changing 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 gradually changing 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 eddy currents in the airflow. In addition, since the axial length of the air duct is relatively large, in order to ensure the consistency of the size of the air outlet to the greatest extent, the internal rib plate 9 will play a role in increasing support and reducing deformation as much as possible during the processing.

[0051] 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.

[0052] In this embodiment, the angle between the flat plate structure and the bent structure is 120°. In some embodiments, the angle between the flat plate structure and the bent structure is any value between 100-170°. The larger angle (close to 170°) enables the nozzle structure 6 to blow out the airflow at a relatively gentle angle when it is close to the film, avoiding excessive impact force due to a steep angle, damaging the film or causing wrinkles in the film; while the smaller angle (close to 100°) is suitable for situations where the working distance is far, and enables the airflow to maintain a certain convergence effect and impact force at a farther distance to meet different working requirements. In some embodiments, a method of changing the angle to adjust the coverage range can be designed. Combined with the movable connection of the lower nozzle plate 602, the output form of the airflow can be adjusted more finely to achieve an airflow with a more stable output pressure rate, once again ensuring the quality of the film material.

[0053] In this embodiment, the angle α between the line connecting the air outlet 301 and the central 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 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°, and 70°. That is, the position of the air outlet 301 allows the airflow to enter from both sides and then pass through the gradient cross-section transition duct structure 5, and the airflow readjusts its direction along the air cavity to form a stable airflow.

[0054] In the present embodiment, the air outlet 301 is located at one end of the internal air outlet structure 3 away from the air nozzle structure 6, which makes the flow path of the airflow in the airflow cavity longer, and can also avoid premature damage of the air outlet structure 2 due to direct impact of the airflow to a certain extent, thereby extending its service life.

[0055] The side plate 7 is provided with a first opening and a second opening; The width adjustment device 8 includes 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.

[0056] The stopper 801 includes a stopper body and a stopper hook fixedly connected to the stopper body.

[0057] The adjusting handle 802 is provided with a sliding groove, and a sliding block 803 is provided in the sliding groove.

[0058] The adjusting handle 802 is a hollow structure for accommodating the first telescopic adjusting rod 804, and the block body is movably connected to the adjusting handle 802 through the first telescopic adjusting rod 804; The stopper hook is connected to the slider 803 via a second telescopic adjustment rod 805; 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; Since the air outlet width can be finely adjusted, the cast film laminating device can adapt to a variety of different working requirements. Whether it is a fine airflow with high speed and small flow, or a large area airflow with low speed and large flow, it can be achieved by adjusting the air outlet width. At the same time, this adjustment method can cope with a variety of situations such as different air source pressures and different air outlet temperatures, so that the device can play a role in various complex industrial environments.

[0059] The structure of the lower nozzle plate 602 matches the structure of the upper nozzle plate 602 and the structure of the block 801; the block 801 can form a stable support for the nozzle structure 6 at the adjusted position to prevent the position of the lower nozzle plate 602 from moving due to airflow pressure or other external factors, thereby ensuring that the air outlet width remains stable during operation.

[0060] 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.

[0061] In this embodiment, a scale is further provided on the adjustment handle 802 to achieve more precise control of the air outlet width.

[0062] Example 2 like Figure 1-7 As shown, this embodiment also provides a film casting device, which includes a casting die head 10, a casting film sheet 11, a cooling roller 12, and the casting film sheet laminating device in embodiment 1 matched with the cooling roller 12 in the casting direction of the viscous flow film material. The viscous fluid film material is cast from the casting die head through the casting film sheet 11 onto the rotating cooling roller 12. The casting film sheet 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.

[0063] like Figure 7 As shown, the direction of the airflow blown out from the cast film laminating device is perpendicular to the tangent direction of the cooling roller 12, and the airflow will generate 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, and according to the principle of pressure action, the vertical pressure helps to overcome the tiny gap or air layer that may exist between the film and the cooling roller 12, so that the film and the cooling roller 12 can be further closely fitted. In some embodiments, the airflow direction is adjustable within a range of 15° left and right of the vertical angle to meet the needs of more film production.

[0064] The film casting device also includes a frame, and the casting film sheet laminating device is installed on the frame through a rotating shaft 13; The rotating shaft 13 is located at two ends of the air inlet structure 1 in the cast film laminating device, and the axes of the two rotating shafts 13 are concentric.

[0065] In this embodiment, the bracket is movable and adjustable. By adjusting the bracket, the positions of the two rotating shafts 13 are 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 from the nozzle structure 6 effectively acts on the bottom where the film and the cooling roller 12 are attached. If the distance is too far, the film and the cooling roller 12 are attached for too long, and substances such as air have been wrapped between the film and the cooling roller 12, and cannot be effectively removed, affecting the flatness and other qualities of the film. The above adjustment angles and positions need to be adjusted at any time according to the actual production of the film, so that the film casting device can adapt to different film production lines.

[0066] The distance between the outer edge and the cooling roller 12 is adjusted according to the production of films of different specifications to achieve a good laminating effect. If the distance is too large, the pressure of the airflow blowing on the film will be reduced, the airflow will blow over a large range, and air will remain between the film and the cooling roller 12; if the distance is too close, the airflow pressure will be too concentrated, and the airflow will be shot onto the film in a streamlined manner, which will blow away the unformed film.

[0067] 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.

[0068] 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.

[0069] In this embodiment, the cast film laminating device is also used to blow out airflow to purge the surface of the cooling roller 12 when the film casting is not performed, so as to achieve the purpose of cleaning the cooling roller 12 without damaging the surface of the cooling roller 12. In a specific implementation, the purge pressure of the airflow is adjusted according to the actual cleaning situation.

[0070] In summary, through the thin film casting device in this embodiment, through the specific structure of the cast film sheet coating 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 coating effect, uniform thickness, no obvious light and dark stripes, and a simple process, which reduces production costs and reduces the safety hazards that exist when manual shutdowns are used to handle damaged films.

[0071] 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 air flow, 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 two sides of the air outlet structure (2); The air outlet structure (2) comprises, in order according to the direction of the air flow, an internal air outlet structure (3), a cylindrical air cavity structure (4), a gradually variable cross-section transition air duct structure (5), and an air nozzle structure (6); one end of the gradually variable 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), which is located inside the cylindrical air cavity structure (4) and is 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 in an integrated manner 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); The side plate (7) is provided with a width adjustment device (8).

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); 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 according to the casting direction of the viscous film material, a casting die head (10), a casting film sheet (11), a cooling roller (12), and a casting film sheet 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 sheet (11) onto a rotating cooling roller (12), and the casting film sheet laminating device blows air onto the viscous fluid film material cast onto the cooling roller (12), thereby solidifying the viscous fluid film material 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 also includes a frame, and the film casting film laminating device is installed on the frame via a rotating shaft (13); The rotating shafts (13) are located at two 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.

Images