Cooling device for extruded PET (Polyethylene Terephthalate) sheet

Abstract

The utility model relates to the technical field of PET (Polyethylene Terephthalate) sheet cooling, and discloses a cooling device after PET sheet extrusion, which comprises an operation table, a cooling table is fixed on one side of the operation table, a plurality of rolling shafts are arranged in the cooling table at intervals, and a cooling structure is arranged above the cooling table. Through the arrangement of the cooling structure, a sheet sequentially penetrates through the three cooling rollers, the surface temperature of the sheet is rapidly reduced to a reasonable range through contact of the cooling rollers, the internal and external temperature difference is reduced, then the sheet enters the cooling bin, cold air is circularly sprayed out through the upper and lower cold air pipes, and the upper and lower surfaces of the sheet are uniformly cooled; a worker conveys cooling water to the atomization spray head through the conveying pipe and the flow dividing bin, sprayed water mist is distributed on the surface of the sheet along with cold air, heat is rapidly taken away after heat absorption and vaporization, the heat conduction efficiency is remarkably improved through combination of the cold air and the water mist, the sheet is cooled more efficiently and evenly, and the surface quality and the size stability of the sheet are further guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of PET sheet cooling technology, and in particular to a PET sheet cooling device after extrusion. Background Technology

[0002] PET sheets are widely used in packaging materials, electronic device protective films and other fields due to their excellent mechanical properties, transparency and good processing performance. In the production process of PET sheets, the high-temperature sheets after extrusion molding need to be cooled and shaped quickly to ensure their dimensional stability and surface quality.

[0003] The existing PET sheet extrusion cooling device (publication number: CN221873123U) has at least the following drawbacks: Although the above device cools and shapes the PET sheet in the cooling box by using cold air, the device only uses cold air as the cooling medium, and its heat transfer efficiency is relatively low. Especially when processing thicker sheets or high-speed production, the internal temperature of the sheet is difficult to reduce quickly, resulting in poor cooling effect of the device. Therefore, we propose this utility model. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a cooling device for PET sheet after extrusion.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A PET sheet extrusion cooling device includes an operating table, a cooling platform fixed on one side of the operating table, a plurality of rollers spaced apart inside the cooling platform, a cooling structure above the cooling platform, the cooling structure including three cooling rollers rotatably mounted on the cooling platform, a cooling chamber fixed on the top surface of the operating table, a dispersion tube fixed on both sides of the cooling chamber, a plurality of cold air pipes fixedly connected to the side of the two dispersion tubes that are close to each other, the plurality of cold air pipes passing through the cooling chamber and extending into the interior of the cooling chamber, and a plurality of atomizing nozzles arranged on the top surface inside the cooling chamber.

[0007] As a further embodiment of this utility model, a cold air supply unit is fixed to the bottom surface of the operating table, the air outlet pipe of the cold air supply unit is connected and fixed to two dispersing pipes, a conveying pipe is connected and fixed to the top surface of the cooling chamber, the bottom end of the conveying pipe penetrates the inner top surface of the cooling chamber and is fixed to a diversion chamber, and several atomizing nozzles are connected and fixed to the bottom surface of the diversion chamber.

[0008] As a further embodiment of this utility model, a drying chamber is fixed to one side of the cooling chamber. A U-shaped tube is installed inside the drying chamber. Several high-pressure nozzles are connected and fixed to one side of the U-shaped tube. The several high-pressure nozzles are evenly distributed along the length of the U-shaped tube and are arranged vertically. The orientation of the several high-pressure nozzles is opposite to the direction of sheet travel. An input pipe is connected and fixed to one side of the drying chamber. One end of the input pipe passes through one side of the drying chamber and is connected and fixed to the U-shaped tube.

[0009] As a further embodiment of this utility model, the top surface of the operating table is fixed with two fixed frames, a cooling chamber and a drying box, and two guide rollers are rotatably arranged inside the fixed frames, with the two guide rollers arranged vertically.

[0010] As a further embodiment of this utility model, a collection hopper is fixed to the bottom surface of the cooling platform, and the position of the collection hopper corresponds to that of the drying box.

[0011] As a further embodiment of this utility model, a gear is fixed to one end of each of the two guide rollers, and the two gears mesh with each other. A motor is fixed to the other end of the upper guide roller, and the motor is fixed to the fixing frame.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] This cooling device, through its cooling structure, allows the sheet material to pass sequentially through three cooling rollers. The cooling rollers quickly reduce the surface temperature of the sheet to a reasonable range through contact, minimizing the temperature difference between the inside and outside. The sheet then enters the cooling chamber, where cold air is circulated and sprayed out through upper and lower cold air pipes, uniformly cooling the upper and lower surfaces of the sheet. At the same time, workers deliver cooling water to the atomizing nozzles through conveying pipes and distribution chambers. The sprayed water mist is distributed on the surface of the sheet with the cold air, absorbs heat, vaporizes, and quickly carries away the heat. The combination of cold air and water mist significantly improves heat transfer efficiency, making the sheet cooling more efficient and uniform, further ensuring the surface quality and dimensional stability of the sheet. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a PET sheet cooling device after extrusion according to the present invention;

[0015] Figure 2 This is a schematic diagram showing the disassembled structure of a PET sheet cooling device after extrusion according to the present invention.

[0016] Figure 3 This is a schematic diagram of the disassembled structure of the cooling chamber of a PET sheet cooling device after extrusion, as proposed in this utility model.

[0017] Figure 4 This is a schematic diagram of the disassembled structure of the fixing frame of the PET sheet cooling device after extrusion according to the present invention.

[0018] In the diagram: 1. Operating table; 2. Cooling table; 201. Cooling roller; 202. Cooling chamber; 203. Dispersion pipe; 204. Cold air pipe; 205. Atomizing nozzle; 3. Roller; 301. Cold air supply unit; 302. Conveying pipe; 303. Diverting chamber; 304. Drying box; 305. U-shaped pipe; 306. High-pressure nozzle; 307. Input pipe; 4. Fixing frame; 401. Guide roller; 402. Gear; 5. Collection hopper. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0020] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Reference Figures 1-4 A PET sheet extrusion cooling device includes an operating table 1, a cooling table 2 fixed on one side of the operating table 1, a plurality of rollers 3 spaced apart inside the cooling table 2, a cooling structure above the cooling table 2, the cooling structure including three cooling rollers 201 rotatably mounted on the cooling table 2, a cooling chamber 202 fixed on the top surface of the operating table 1, a dispersion tube 203 fixed on both sides of the cooling chamber 202, a plurality of cold air pipes 204 connected and fixed on the side of the two dispersion tubes 203 that are close to each other, the plurality of cold air pipes 204 all penetrate the cooling chamber 202 and extend into the interior of the cooling chamber 202, a plurality of atomizing nozzles 205 are provided on the top surface inside the cooling chamber 202, and the cooling rollers 201 are existing technology.

[0023] In this embodiment, a cold air supply unit 301 is fixed to the bottom surface of the operating table 1. The air outlet pipe of the cold air supply unit 301 is connected and fixed to two dispersing pipes 203. A conveying pipe 302 is connected and fixed to the top surface of the cooling chamber 202. The bottom end of the conveying pipe 302 penetrates the inner top surface of the cooling chamber 202 and is fixed to a diversion chamber 303. Several atomizing nozzles 205 are all connected and fixed to the bottom surface of the diversion chamber 303. The cold air supply unit 301 is existing technology. Through the setting of the cooling structure, the operator passes the extruded PET sheet through three cooling rollers 201 in sequence. The cooling rollers 201 directly contact the surface of the sheet, quickly reducing the high temperature to a reasonable range, effectively reducing the temperature difference between the inside and outside of the sheet, and reducing the internal stress and quality defects that may be caused by uneven temperature. Subsequently, the sheet enters the cooling chamber 202, located between the upper and lower cold air pipes 204. After the cold air supply unit 301 is started, cold air is sprayed out through the cold air pipes 204. The upper and lower cold air pipes 204 are divided into... Instead of cooling the top and bottom of the sheet, the cold air blown from the lower cold air duct 204 flows upward and is guided by the upper cold air duct 204 to form a circulating airflow, so that the cold air is evenly distributed around the sheet, thereby achieving efficient cooling of the sheet from all directions. During the cold air cooling process, the operator connects an external pump through the delivery pipe 302 to deliver cooling water to the distribution chamber 303, and further distributes it to the atomizing nozzle 205. The atomizing nozzle 205 sprays out a fine water mist, which is evenly distributed with the cold air and adheres to the surface of the sheet. The water mist quickly removes the heat of the sheet through vaporization and heat absorption. The combination of water mist and cold air significantly improves the heat transfer efficiency, which not only speeds up the cooling speed, but also effectively reduces the heat residue in the sheet during the cooling process. Through the above methods, the cooling device fully utilizes the synergistic effect of the cooling roller 201, the cold air duct 204 and the water mist spray, achieving a highly efficient and uniform cooling effect for the PET sheet and improving the cooling effect of the device.

[0024] In this embodiment, a drying chamber 304 is fixed to one side of the cooling chamber 202. A U-shaped tube 305 is installed inside the drying chamber 304. Several high-pressure nozzles 306 are connected and fixed to one side of the U-shaped tube 305. These nozzles are evenly distributed along the length of the U-shaped tube 305, arranged vertically, and their orientation is opposite to the sheet's travel direction. An input pipe 307 is connected and fixed to one side of the drying chamber 304. One end of the input pipe 307 passes through one side of the drying chamber 304 and is connected and fixed to the U-shaped tube 305. After the sheet is cooled, it enters the U-shaped tube 305 and is positioned between the vertically arranged high-pressure nozzles 306. The operator connects an external fan to the input pipe 307, and air flows from the input pipe 307 and the U-shaped tube 305. The air is fed into the high-pressure nozzle 306 and sprayed out. After the sheet cools, it continues to enter the U-shaped tube 305. The sheet is located between several high-pressure nozzles 306 distributed vertically. The operator connects the input pipe 307 to an external fan to guide the high-pressure air into the U-shaped tube 305, where it is evenly sprayed out by the high-pressure nozzles 306. The high-pressure nozzles 306 use high-speed airflow to quickly remove residual water mist and droplets from the sheet surface, effectively achieving preliminary drying of the sheet. At the same time, it prevents water droplets from affecting the surface quality and transparency of the sheet. The multi-point distribution and reasonable spray angle of the high-pressure nozzles 306 ensure that the upper and lower surfaces of the sheet are evenly exposed to airflow, accelerating the evaporation of moisture and the process of airflow carrying away moisture, thus providing a drier and flatter sheet for subsequent winding and processing.

[0025] In this embodiment, two fixed frames 4, a cooling chamber 202 and a drying chamber 304 are fixed on the top surface of the operating table 1. Two guide rollers 401 are rotatably arranged inside the fixed frame 4. The two guide rollers 401 are arranged vertically. After the sheet is cooled by the cooling roller 201, the guide roller 401 in the first fixed frame 4 guides and conveys the sheet. After the sheet passes through the drying chamber 304, it is tensioned and conveyed by the guide roller 401 in the second fixed frame 4.

[0026] In this embodiment, a collection hopper 5 is fixed on the bottom surface of the cooling platform 2. The collection hopper 5 corresponds to the position of the drying box 304. When the water mist sprayed from the atomizing nozzle 205 flows out of the drying box 304, it falls into the collection hopper 5, and the collection hopper 5 collects the water mist.

[0027] In this embodiment, a gear 402 is fixed to one end of each of the two guide rollers 401, and the two gears 402 mesh with each other. A motor is fixed to the other end of the upper guide roller 401, and the motor is fixed to the fixing frame 4. The upper and lower guide rollers 401 rotate in opposite directions under the action of the gear 402 and the motor to ensure the tensioning and conveying effect of the sheet.

[0028] Working Principle: In operation, the extruded PET sheet is passed sequentially through three cooling rollers 201. The cooling rollers 201, through direct contact with the sheet surface, quickly reduce the high temperature to a reasonable range, effectively reducing the temperature difference between the inside and outside of the sheet and mitigating internal stress and quality defects that may result from uneven temperature distribution. The sheet then enters the cooling chamber 202, located between the upper and lower cooling air ducts 204. After the cold air supply unit 301 is activated, cold air is ejected through the cooling air ducts 204. The upper and lower cooling air ducts 204 cool the top and bottom of the sheet respectively. The cold air blown from the lower cooling air duct 204 flows upwards and is guided by the upper cooling air duct 204, forming a circulating airflow. The cooling water is evenly distributed around the sheet, achieving efficient cooling from all directions. During the cooling process, workers connect an external pump to the delivery pipe 302 to deliver cooling water to the distribution chamber 303, which then distributes it to the atomizing nozzles 205. The atomizing nozzles 205 spray out a fine water mist, which is evenly distributed with the cold air and adheres to the surface of the sheet. Through vaporization and heat absorption, the water mist quickly removes heat from the sheet. The combination of water mist and cold air significantly improves heat transfer efficiency, not only accelerating the cooling speed but also effectively reducing residual heat during the cooling process. After cooling, the sheet enters the U-shaped tube 305 and is positioned between several high-pressure nozzles 306. The operator connects an external fan to the inlet pipe 307. Air is input from the inlet pipe 307 and U-shaped pipe 305 to the high-pressure nozzle 306 and then sprayed out. After the sheet is cooled, it continues to enter the U-shaped pipe 305. The sheet is located between several high-pressure nozzles 306 distributed vertically. The operator connects an external fan to the inlet pipe 307, and the high-pressure air is guided into the U-shaped pipe 305 through the inlet pipe 307 and sprayed evenly by the high-pressure nozzles 306. The high-pressure nozzles 306 use high-speed airflow to quickly remove residual water mist and droplets on the surface of the sheet, effectively achieving preliminary drying of the sheet, while preventing water droplet residue from affecting the surface quality and transparency of the sheet. The multi-point distribution of the high-pressure nozzles 306 and The reasonable spray angle ensures that the upper and lower surfaces of the sheet are evenly exposed to air, accelerating the evaporation of moisture and the process of airflow carrying away moisture, thus providing a drier and flatter sheet for subsequent winding and processing. After the sheet is cooled by the cooling roller 201, the guide roller 401 in the first fixed frame 4 guides and conveys the sheet. After passing through the drying box 304, the sheet is tensioned and conveyed by the guide roller 401 in the second fixed frame 4. The water mist sprayed from the atomizing nozzle 205 flows out of the drying box 304 and falls into the collection hopper 5, which collects the water mist. The upper and lower guide rollers 401 rotate in opposite directions under the action of the gear 402 and the motor to ensure the tensioning and conveying effect of the sheet.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A PET sheet extrusion post-cooling device comprising an operating table (1), characterized in that: The operating platform (1) is fixed with a cooling platform (2) on one side, a plurality of rollers (3) are arranged at intervals in the cooling platform (2), a cooling structure is arranged above the cooling platform (2), the cooling structure comprises three cooling rollers (201) rotatably arranged on the cooling platform (2), the top surface of the operating platform (1) is fixed with a cooling bin (202), both sides of the cooling bin (202) are fixed with dispersion pipes (203), both sides of the two dispersion pipes (203) are fixedly connected with a plurality of cold air pipes (204), the plurality of cold air pipes (204) penetrate the cooling bin (202) and extend into the cooling bin (202), and a plurality of atomizing nozzles (205) are arranged on the top surface of the cooling bin (202).

2. The PET sheet extrusion post-cooling device according to claim 1, characterized in that, The bottom surface of the operating platform (1) is fixed with a cold air supply machine (301), the air outlet pipe of the cold air supply machine (301) is fixedly connected with the two dispersion pipes (203), the top surface of the cooling bin (202) is fixedly connected with a conveying pipe (302), the bottom end of the conveying pipe (302) penetrates the top surface of the cooling bin (202) and is fixed with a shunt bin (303), and the plurality of atomizing nozzles (205) are fixedly connected with the bottom surface of the shunt bin (303).

3. The PET sheet extrusion post-cooling device according to claim 2, characterized in that, One side of the cooling bin (202) is fixed with a drying box (304), the inside of the drying box (304) is provided with a U-shaped pipe (305), one side of the U-shaped pipe (305) is fixedly connected with a plurality of high-pressure nozzles (306), the plurality of high-pressure nozzles (306) are uniformly distributed along the length direction of the U-shaped pipe (305), the plurality of high-pressure nozzles (306) are arranged in an up-down manner, the direction of the plurality of high-pressure nozzles (306) is opposite to the direction of the sheet, one side of the drying box (304) is fixedly connected with an input pipe (307), one end of the input pipe (307) penetrates one side of the drying box (304) and is fixedly connected with the U-shaped pipe (305).

4. The PET sheet extrusion post-cooling device according to claim 3, characterized in that, The top surface of the operating platform (1) is fixed with two fixed frames (4), the cooling bin (202) and the drying box (304), two guide rollers (401) are rotatably arranged in the fixed frame (4), and the two guide rollers (401) are arranged in an up-down manner.

5. A PET sheet extrusion post-cooling device according to claim 4, characterized in that, The bottom surface of the cooling platform (2) is fixed with a collecting hopper (5), and the collecting hopper (5) corresponds to the position of the drying box (304).

6. A PET sheet extrusion post-cooling device according to claim 5, characterized in that, One end of each of the two guide rollers (401) is fixed with a gear (402), the two gears (402) are meshed with each other, the other end of the upper guide roller (401) is fixed with a motor, and the motor is fixed with the fixed frame (4).

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