Efficient cooling casting machine for polypropylene film production

Abstract

The utility model relates to a polypropylene film production efficient cooling casting machine, and relates to the technical field of casting method polymer films, the polypropylene film production efficient cooling casting machine comprises a rack, a cooling roller and a fan, the rack is fixedly provided with a cooling cover, the middle of the cooling cover is provided with a cooling port for a casting film to penetrate through, and the cooling cover comprises an inner plate, an outer plate and a side plate; the cooling opening is a hollow area formed by surrounding the cast film with the inner plate, the outer plate surrounds the inner plate, a gap is reserved between the inner plate and the outer plate, the side plate is fixedly connected with the inner plate and the outer plate at the same time, a closed space defined by the inner plate, the outer plate and the side plate is a cooling bin, and heat absorption liquid is contained in the cooling bin. An air inlet and an air outlet are formed in the outer plate, and the air inlet or the air outlet is communicated with the fan. The device has the advantages that the problems of swelling, warping and deformation of the cast film caused by direct influence of cold air are avoided as much as possible, and the flatness and the product quality of the formed film are guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of cast polymer films, and in particular to a high-efficiency cooling cast machine for producing polypropylene films. Background Art

[0002] Polypropylene film, as an important polymer material, is widely used in a variety of industries, including packaging, electronics, and automobiles. Currently, polypropylene film is mainly produced through the cast film method, which rapidly cools the molten polypropylene raw material film through cooling rollers to form the desired film product.

[0003] In the related art, there is a high-efficiency cooling cast film machine, which includes a frame, a body is arranged on the frame, an extrusion die is fixedly arranged on the frame at one end of the body, and a cooling device is arranged at the end of the extrusion die away from the body, the cooling device includes a cooling roller and a blow hood, a coolant circulates inside the cooling roller, and a blower is connected to the blow hood and is arranged, and the blower hood faces the cooling roller. When in use, the molten cast film material is extruded through the frame, and the cast film material passes through the die orifice of the extrusion die to form a high-temperature cast film. The high-temperature cast film reaches the outer wall of the cooling roller, and the cooling water cools the cooling roller, thereby cooling the cast film. At the same time, the fan generates a high-speed cold air, and the cold air is blown onto the cast film through the blowing port of the blow hood, thereby rapidly cooling the cast film.

[0004] In the process of implementing this application, it was found that there are at least the following problems in this technology: the polypropylene film is extremely thin after forming. If it is not completely cooled, the physical shape of the cast film is unstable. At this time, it is affected by the cold air blown out by the blow hood, and the cast film will be blown up by the cold wind. After it is completely cooled, the film will warp, deform, and other problems will occur, seriously affecting the flatness of the film and product quality. Utility Model Content

[0005] In order to avoid as much as possible the problems of bulging, warping and deformation of the cast film caused by direct influence of cold wind, and to ensure the flatness and product quality of the film after forming, the present application provides a high-efficiency cooling cast film production machine for polypropylene film.

[0006] The present application provides a high-efficiency cooling casting machine for producing polypropylene film, which adopts the following technical solutions:

[0007] A high-efficiency cooling casting machine for producing polypropylene film comprises a frame, a cooling roller, and a fan. A guide roller for guiding the movement of the casting film is rotatably provided on the frame. A cooling hood is fixedly provided on the frame. The cooling hood is located between the guide roller and the cooling roller. A cooling port for the casting film to pass through is provided in the middle of the cooling hood. The cooling hood comprises an inner plate, an outer plate, and a side plate. The cooling port is a hollow area formed by the inner plate surrounding the inner plate. The outer plate is arranged around the inner plate, with a gap left between the inner plate and the outer plate. The side plate is fixedly connected to the inner plate and the outer plate at the same time. The inner plate, the outer plate, and the side plate jointly surround a closed space as a cooling bin. Heat-absorbing liquid is contained in the cooling bin. An air inlet and an air outlet are provided on the outer plate. The air inlet or the air outlet is connected to the fan.

[0008] By adopting the above technical solution, when in use, the molten cast film material is extruded through the frame, and the cast film material forms a high-temperature cast film through the die of the extrusion die. The high-temperature cast film reaches the outer wall of the cooling roller, and the cooling water cools the cooling roller, thereby performing preliminary cooling on the cast film. When the cast film is guided into the cooling port of the cooling cover by the guide roller, the fan guides the airflow from the air inlet into the cooling bin and then separates from the air outlet. On the one hand, it accelerates the discharge of heat in the cooling bin, and on the other hand, it accelerates the air flow in the cooling bin, speeds up the evaporation rate of the heat-absorbing liquid, and rapidly cools the cooling bin, thereby quickly absorbing the heat in the cooling port and further cooling the cast film passing through the cooling port. In this way, the problems of bulging, warping and deformation of the cast film directly affected by the cold wind are avoided as much as possible, thereby ensuring the flatness of the film and the product quality.

[0009] Preferably, a first water tank and a second water tank are provided in the cooling chamber, wherein the first water tank is fixed on the top of the inner plate and the second water tank is fixed on the bottom of the outer plate, and the first water tank and the second water tank are used to contain heat-absorbing liquid.

[0010] By adopting the above technical solution, the first water tank and the second water tank can stably accommodate the heat-absorbing liquid, so that the heat-absorbing liquid is stratified in the cooling chamber, and provide flow space for the flowing gas in the cooling chamber, thereby increasing the contact area between the heat-absorbing liquid and the flowing gas, increasing the evaporation rate of the heat-absorbing liquid, and further improving the cooling effect of the cast film passing through the cooling port.

[0011] Preferably, a first water supply pipe and a second water supply pipe are provided in the cooling bin, one end of each of the first water supply pipe and the second water supply pipe extends out of the cooling bin, the other end of the first water supply pipe extends into the first water tank, and the other end of the second water supply pipe extends into the second water tank.

[0012] By adopting the above technical solution, the first water supply pipe and the second water supply pipe can conveniently replenish the heat-absorbing liquid into the first water tank and the second water tank, ensuring that there is always enough heat-absorbing liquid in the water tank to maintain the cooling effect during long-term working, thereby ensuring the continuity of the cooling work.

[0013] Preferably, a liquid level sensor is installed in each of the first water tank and the second water tank, and the liquid level sensor is used to detect the liquid level of the heat-absorbing liquid in the first water tank and the second water tank.

[0014] By adopting the above technical solution, the liquid level sensor can monitor the liquid level of the heat absorbing liquid in the first water tank and the second water tank in real time, and try to avoid affecting the cooling quality of the cast film due to insufficient heat absorbing liquid.

[0015] Preferably, two warning lights are provided on the outer panel, wherein one of the liquid level sensors is electrically connected to one of the warning lights, and the other of the liquid level sensors is electrically connected to the other warning light.

[0016] By adopting the above technical solution, when the liquid level sensor in the first water tank detects that the liquid level is too low, the warning light electrically connected to it lights up, prompting the staff to replenish the heat-absorbing liquid in the first water tank; similarly, when the liquid level sensor in the second water tank detects that the liquid level is too low, the corresponding warning light lights up, making it convenient for the staff to quickly and accurately understand which tank needs to be replenished with heat-absorbing liquid, thereby improving work efficiency and accuracy.

[0017] Preferably, the outer plate and the side plate are made of heat-insulating material, and the inner plate is made of heat-conducting material.

[0018] By adopting the above technical solution, the outer plate and the side plate are made of insulating material to prevent the cooling chamber from directly absorbing heat from the air outside the outer plate and the side plate, and the thermal conductive material of the inner plate helps to quickly absorb the heat in the cooling port, thereby ensuring.

[0019] Preferably, a plurality of reinforcing ribs are provided between the inner plate and the outer plate, one end of the reinforcing rib is fixedly connected to the outer plate, and the other end of the reinforcing rib is fixedly connected to the inner plate.

[0020] By adopting the above technical solution, the reinforcing ribs enhance the structural strength of the cooling cover, prevent the cooling cover from bulging or denting, improve the flatness of the inner and outer plate surfaces, thereby reducing the resistance to gas flow in the cooling cover and ensuring the stability and reliability of the cooling device.

[0021] Preferably, a partition plate is provided in the cooling bin, the top of the partition plate is fixedly connected to the outer plate, the bottom of the partition plate is fixedly connected to the inner plate, the end of the partition plate is fixedly connected to the side plate, and the air inlet and air outlet are both arranged close to the partition plate, the air inlet is located on one side of the partition plate, and the air outlet is located on the other side of the partition plate.

[0022] By adopting the above technical solution, the partition plate prevents the flowing gas from entering the cooling chamber from the air inlet and then directly escaping from the air outlet, and guides the flowing gas entering the cooling chamber to form an effective airflow path, so that the flowing gas can be fully released from the heat-absorbing liquid and the gas inside the cooling chamber before being discharged from the air outlet, thereby improving the cooling efficiency and cooling effect of the flowing gas.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. By setting up a cooling hood, heat absorbing liquid, air inlet and air outlet, the cast film is further cooled after leaving the cooling roller, reducing the bulging, warping and deformation of the cast film caused by the direct influence of cold air, and ensuring the flatness of the film and product quality;

[0025] 2. By setting up the first water tank, the second water tank, the liquid level sensor and the warning light, the sufficient supply of heat absorbing liquid is ensured, the sustainability of the cooling work of the cooling cover is improved, and the water replenishment operation of the staff is convenient;

[0026] 3. By setting an inner plate made of heat-conducting material, an outer plate and side plates made of heat-insulating material, and setting a partition plate, the gas flow path in the cooling chamber is optimized, and the heat absorption path performance of the cooling chamber is optimized, thereby improving the cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural diagram of a high-efficiency cooling casting machine for producing polypropylene film provided in an embodiment of the present application.

[0028] Figure 2 This is a schematic cross-sectional view of a high-efficiency cooling casting machine for producing polypropylene film provided in an embodiment of the present application.

[0029] Explanation of the accompanying symbols: 1. Frame; 11. Extrusion die; 12. Cooling roller; 13. Guide roller; 14. Machine body; 2. Fan; 3. Cooling hood; 31. Inner plate; 311. First water trough; 32. Outer plate; 321. Second water trough; 33. Side plate; 34. Cooling bin; 341. Reinforcement rib; 342. Partition plate; 343. Air inlet; 344. Air outlet; 35. Cooling port; 36. First water supply pipe; 37. Second water supply pipe; 38. Liquid level sensor; 39. Warning light. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-2 This application is described in further detail.

[0031] The present application discloses a high-efficiency cooling casting machine for producing polypropylene film. Figure 1It includes a frame 1, a cooling roller 12, and a fan 2. A body 14 is provided on the frame 1. An extrusion die 11 is fixedly provided on the frame 1 at one end of the body 14. The cooling roller 12 is rotatably provided on the frame 1. The cooling roller 12 is located on the side of the extrusion die 11 facing away from the body 14. Cooling liquid flows inside the cooling roller 12. The cooling liquid is introduced into or out of the cooling roller 12 from the axis of the cooling roller 12 through a water pipe. A guide roller 13 for guiding the movement of the cast film is also rotatably provided on the frame 1. When in use, the molten cast film material is extruded through the frame 1, and the cast film material passes through the die of the extrusion die 11 to form a high-temperature cast film. The high-temperature cast film reaches the outer wall of the cooling roller 12. The cooling water cools the cooling roller 12, thereby performing preliminary and rapid cooling on the cast film, so that the cast film is initially shaped.

[0032] Reference Figure 1 and Figure 2 A cooling hood 3 is also fixedly installed on the frame 1. The cooling hood 3 is located between the guide roller 13 and the cooling roller 12. A cooling port 35 is provided in the middle of the cooling hood 3 for the cast film to pass through. The cooling hood 3 includes an inner plate 31, an outer plate 32, and a side plate 33. The cooling port 35 is a hollow area formed by the inner plate 31 surrounding the cast film, specifically a flat gap adapted to the width of the cast film. The outer plate 32 is arranged around the inner plate 31, with a gap between the inner plate 31 and the outer plate 32. The side plate 33 is fixedly connected to both the inner plate 31 and the outer plate 32. The inner plate 31, the outer plate 32, and the side plate 33 together surround a closed space as a cooling bin 34, which contains a heat-absorbing liquid. An air inlet 343 and an air outlet 344 are provided on the outer plate 32. The air inlet 343 or the air outlet 344 is connected to the fan 2. If the air inlet 343 is connected to the fan 2, the fan 2 blows air into the cooling chamber 34 through the air inlet 343. If the air outlet 344 is connected to the fan 2, the fan 2 draws air into the cooling chamber 34 through the air outlet 344. The outer panels 32 and the side panels 33 are made of a heat-insulating material, such as bakelite, and the inner panel 31 is made of a heat-conducting material, such as an aluminum alloy. The heat-absorbing liquid can be water.

[0033] Reference Figure 1 and Figure 2 When the cast film leaves the cooling roller 12, the guide roller guides the cast film into the cooling port 35 of the cooling cover 3, and the fan 2 guides the air flow from the air inlet 343 into the cooling bin 34 and then leaves from the air outlet 344, which not only discharges the heat in the cooling bin 34, but also accelerates the air flow in the cooling bin 34, speeds up the evaporation rate of the heat-absorbing liquid, and quickly cools the cooling bin 34, thereby quickly absorbing the heat in the cooling port 35 and further cooling the cast film passing through the cooling port 35.

[0034] In order to ensure sufficient supply of heat absorbing liquid and the sustainability of cooling work of cooling cover 3, refer to Figure 2The cooling chamber 34 is equipped with a first water trough 311 and a second water trough 321. The first water trough 311 is fixed to the top of the inner plate 31, and the second water trough 321 is fixed to the bottom of the outer plate 32. Both the first water trough 311 and the second water trough 321 are used to hold heat-absorbing liquid. The heat-absorbing liquid is layered within the cooling chamber 34: one layer in the first water trough 311, located on the top side of the cast film; the other layer in the second water trough 321, located on the bottom side of the cast film, improving the uniformity of heat absorption from the cooling holes.

[0035] Reference Figure 2 A first water supply pipe 36 and a second water supply pipe 37 are installed in the cooling chamber 34. Specifically, the first water supply pipe 36 and the second water supply pipe 37 extend through and are fixed to the outer plate 32. One end of each of the first water supply pipe 36 and the second water supply pipe 37 extends out of the cooling chamber 34, while the other end of the first water supply pipe 36 extends into the first water tank 311, and the other end of the second water supply pipe 37 extends into the second water tank 321. A liquid level sensor 38 is installed in each of the first water tank 311 and the second water tank 321. Two indicator lights 39 are installed on the outer plate 32, one of which is electrically connected to one of the indicator lights 39, and the other is electrically connected to the other indicator light 39. The liquid level sensors 38 are used to detect the liquid levels of the heat-absorbing liquid in the first water tank 311 and the second water tank 321. When the heat-absorbing liquid in the first water tank 311 and the second water tank 321 is insufficient, the corresponding liquid level sensor 38 will send a signal to the prompt light 39 electrically connected to it. The prompt light 39 lights up, reminding the staff to replenish the heat-absorbing liquid to the first water tank 311 through the first water replenishment pipe 36 in time, or to replenish the heat-absorbing liquid to the second water tank 321 through the second water replenishment pipe 37, so as to ensure sufficient supply of heat-absorbing liquid and ensure the sustainability of the cooling work of the cooling cover 3.

[0036] In order to enhance the structural strength of the cooling cover 3 and prevent the cooling cover 3 from bulging or sinking, Figure 2 A plurality of reinforcing ribs 341 are provided between the inner plate 31 and the outer plate 32 , one end of the reinforcing rib 341 is fixedly connected to the outer plate 32 , and the other end of the reinforcing rib 341 is fixedly connected to the inner plate 31 .

[0037] In order to prevent the flowing gas from entering the cooling chamber 34 from the air inlet 343 and then directly escaping from the air outlet 344, Figure 2A partition plate 342 is provided in the cooling chamber 34. The top of the partition plate 342 is fixedly connected to the outer plate 32, the bottom of the partition plate 342 is fixedly connected to the inner plate 31 through the bottom of the first water tank 311, and the end of the partition plate 342 is fixedly connected to the side plate 33. The air inlet 343 and the air outlet 344 are both provided near the partition plate 342. The air inlet 343 is located on one side of the partition plate 342, and the air outlet 344 is located on the other side of the partition plate 342. When the flowing gas enters the cooling chamber 34 from the air inlet 343, the flowing gas needs to fully circle the cooling chamber 34 before reaching the air outlet 344. During this process, the flowing gas fully contacts the surface of the heat-absorbing liquid, ensuring the cooling effect on the cooling holes.

[0038] The implementation principle of the high-efficiency cooling casting machine for producing polypropylene film in the embodiment of the present application is as follows: during the production process of polypropylene film, the frame 1 extrude molten polypropylene fluid, and a high-temperature cast film is formed through the die opening of the extrusion die 11, which is first subjected to preliminary rapid cooling and shaping at the cooling roller 12. Then, the cast film enters the cooling port 35 of the cooling hood 3 under the guidance of the guide roller 13. The fan 2 works to guide the gas to flow rapidly from the air inlet 343 to the air outlet 344 in the cooling bin 34. The flow of air accelerates the discharge of heat in the cooling bin 34, and accelerates the air flow rate on the surface of the heat-absorbing liquid in the first water tank 311 and the second water tank 321, prompting the heat-absorbing liquid to evaporate quickly, quickly reducing the temperature of the cooling bin 34, and further cooling the cast film passing through the cooling port 35. In this process, the flowing gas does not directly contact the cast film, and the problems of bulging, warping and deformation of the cast film are avoided as much as possible, thereby ensuring the flatness and product quality of the film after forming.

[0039] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A high-efficiency cooling casting machine for producing polypropylene film, comprising a frame (1), a cooling roller (12), and a fan (2), wherein a guide roller (13) for guiding the movement of the casting film is rotatably provided on the frame (1), characterized in that: A cooling cover (3) is fixedly provided on the frame (1), and the cooling cover (3) is located between the guide roller (13) and the cooling roller (12). A cooling port (35) for the cast film to pass through is provided in the middle of the cooling cover (3), and the cooling cover (3) comprises an inner plate (31), an outer plate (32), and a side plate (33). The cooling port (35) is a hollow area formed by the inner plate (31) surrounding the cast film, and the outer plate (32) is arranged around the inner plate (31). The inner plate (3 1) and the outer plate (32), the side plate (33) is fixedly connected to the inner plate (31) and the outer plate (32), the inner plate (31), the outer plate (32), and the side plate (33) together surround a closed space for a cooling chamber (34), and the cooling chamber (34) contains a heat-absorbing liquid. The outer plate (32) is provided with an air inlet (343) and an air outlet (344), and the air inlet (343) or the air outlet (344) is communicated with the fan (2).

2. A high-efficiency cooling casting machine for producing polypropylene film according to claim 1, characterized in that: A first water trough (311) and a second water trough (321) are provided in the cooling chamber (34), wherein the first water trough (311) is fixed on the top of the inner plate (31), and the second water trough (321) is fixed on the bottom of the outer plate (32) close to the side of the inner plate (31), and the first water trough (311) and the second water trough (321) are used to contain heat-absorbing liquid.

3. A high-efficiency cooling casting machine for producing polypropylene film according to claim 2, characterized in that: A first water supply pipe (36) and a second water supply pipe (37) are provided in the cooling bin (34); one end of each of the first water supply pipe (36) and the second water supply pipe (37) extends out of the cooling bin (34); the other end of the first water supply pipe (36) extends into the first water tank (311); and the other end of the second water supply pipe (37) extends into the second water tank (321).

4. A high-efficiency cooling casting machine for producing polypropylene film according to claim 2, characterized in that: A liquid level sensor (38) is installed in each of the first water tank (311) and the second water tank (321). The liquid level sensor (38) is used to detect the liquid level of the heat-absorbing liquid in the first water tank (311) and the second water tank (321).

5. A high-efficiency cooling casting machine for producing polypropylene film according to claim 4, characterized in that: Two warning lights (39) are provided on the outer plate (32), wherein one of the liquid level sensors (38) is electrically connected to one of the warning lights (39), and the other of the liquid level sensors (38) is electrically connected to the other warning light (39).

6. A high-efficiency cooling casting machine for producing polypropylene film according to claim 1, characterized in that: The outer plate (32) and the side plate (33) are made of heat-insulating material, and the inner plate (31) is made of heat-conducting material.

7. A high-efficiency cooling casting machine for producing polypropylene film according to claim 1, characterized in that: A plurality of reinforcing ribs (341) are provided between the outer plates (32), one end of the reinforcing rib (341) is fixedly connected to the outer plate (32), and the other end of the reinforcing rib (341) is fixedly connected to the inner plate (31).

8. A high-efficiency cooling casting machine for producing polypropylene film according to claim 1, characterized in that: A partition plate (342) is provided in the cooling bin (34), the top of the partition plate (342) is fixedly connected to the outer plate (32), the bottom of the partition plate (342) is fixedly connected to the inner plate (31), and the end of the partition plate (342) is fixedly connected to the side plate (33). The air inlet (343) and the air outlet (344) are both provided close to the partition plate (342), the air inlet (343) is located on one side of the partition plate (342), and the air outlet (344) is located on the other side of the partition plate (342).

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