A multi-layer co-extruded plastic film blow molding apparatus

Abstract

The utility model relates to the technical field of plastic processing, concretely to a kind of multilayer co-extrusion plastic film blow molding equipment, including workbench, upper water cooling roller, lower water cooling roller, cooling device and driving device, the bottom wall four corners of workbench are equipped with supporting leg, the top wall of workbench is equipped with mounting bracket, the upper water cooling roller of multiple groups is installed in the upper portion of mounting bracket, the lower water cooling roller of multiple groups is rotatably installed in the lower portion of mounting bracket, the relative rotation of upper and lower water cooling roller helps to uniformly apply pressure to film, further improve cooling efficiency and flatness, after cooling and setting, film will be flattened, and along production line into next processing equipment, the mode that upper water cooling roller and lower water cooling roller are combined can significantly improve cooling efficiency, reduce cooling time, also help to reduce stress concentration phenomenon in film, reduce deformation risk, and then improve the quality and flatness of film.

Description

Technical Field

[0001] This utility model relates to the field of plastic processing technology, specifically to a multi-layer co-extrusion plastic film blow molding equipment. Background Technology

[0002] As is well known, multilayer co-extruded plastic films have attracted widespread attention in the plastics processing field due to their excellent physical properties and wide range of applications. These films are typically made from multiple different types of plastic materials through a co-extrusion process, with each layer imparting specific functional properties to the film, such as enhanced mechanical strength, gas barrier properties, or optical transparency. However, in traditional multilayer co-extruded plastic film production equipment, the cooling process is one of the key factors affecting product quality and production efficiency, and current technologies face the following challenges.

[0003] The molten plastic material exiting the multi-layer co-extrusion die forms a tubular film bubble. After initial cooling by the air ring, this film bubble enters the subsequent cooling device. Traditional cooling methods mainly rely on air cooling or other cooling methods. These methods are difficult to achieve a rapid and uniform cooling effect on the film. Due to the slow cooling speed, not only is production efficiency affected, but stress concentration may also occur inside the film, leading to problems such as deformation or cracking. Furthermore, the lack of an effective pressure control mechanism makes the film prone to irregular shrinkage or stretching during the cooling process, resulting in poor flatness of the final product and affecting its performance and appearance quality. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a multi-layer co-extrusion plastic film blow molding equipment.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a multi-layer co-extrusion plastic film blow molding equipment, comprising a worktable, an upper water-cooled roller, a lower water-cooled roller, a cooling device, and a driving device. Support legs are installed at the four corners of the bottom wall of the worktable, and a mounting frame is installed on the top wall of the worktable. Multiple sets of the upper water-cooled rollers are installed in the upper part of the mounting frame, and multiple sets of the lower water-cooled rollers are rotatably installed in the lower part of the mounting frame. The driving device is installed at one end of each of the upper and lower water-cooled rollers, penetrating the side wall of the mounting frame. The left and right ends of the upper and lower water-cooled rollers are cyclically connected through the cooling device.

[0006] Furthermore, the present invention is improved in that the cooling device includes a refrigeration box, a bearing, an inlet pipe, a first diverter pipe, an outlet pipe, a second diverter pipe, and a pump body. The refrigeration box is installed on the bottom wall of the workbench. Two sets of inlet pipes are installed at one end of the refrigeration box. The pump body is installed on the outer wall of the inlet pipe. The outlet end of each set of inlet pipes is equipped with a first diverter pipe. The ends of multiple sets of first diverter pipes are connected to the upper water-cooling roller or the lower water-cooling roller through the drive device and the side wall of the mounting frame via bearings. The outlet pipe is installed on the other side wall of the refrigeration box. Multiple sets of second diverter pipes are installed at the end of the outlet pipe. The ends of multiple sets of second diverter pipes are connected to the upper water-cooling roller or the lower water-cooling roller through the side wall of the mounting frame via bearings.

[0007] Furthermore, the present invention is improved in that the driving device includes a protective shell, a driving gear, a driven gear, and a driving motor. Two sets of the protective shells are installed on the upper and lower sides of the mounting bracket near the liquid inlet pipe. The driving gear is rotatably installed inside each set of the protective shells. One end of the driving gear continuously meshes with multiple sets of driven gears. The driving motor is installed on the side wall of the protective shell, and the output end of the driving motor passes through the side wall of the protective shell and is connected to the driving gear.

[0008] Furthermore, the present invention is improved in that a horizontal pipe is installed at the end of the liquid inlet pipe and the liquid outlet pipe away from the refrigeration box, and the top ends of the two sets of horizontal pipes are connected to the bottom ends of the corresponding first or second diversion pipe.

[0009] Furthermore, an improvement of this utility model is that the drive motor is a servo motor.

[0010] Furthermore, an improvement of this utility model is that the mounting bracket has a U-shaped design.

[0011] Furthermore, the present invention is improved by installing a support plate for supporting the refrigeration box between the four sets of support legs.

[0012] Furthermore, the present invention is improved in that the left and right sidewalls of the workbench are both designed with rounded corners.

[0013] Compared with the prior art, this utility model provides a multi-layer co-extrusion plastic film blow molding equipment, which has the following beneficial effects: This multi-layer co-extrusion plastic film blow molding equipment, through the combination of upper and lower water-cooled rollers and a cooling device, can significantly improve cooling efficiency, reduce cooling time, and thus accelerate production speed. Because the water-cooled rollers provide uniform and effective cooling, this helps reduce stress concentration in the plastic film, lowers the risk of deformation, and thus improves film quality and flatness. The design of the cooling device ensures that all water-cooled rollers receive uniform cooling, avoiding localized overheating or insufficient cooling, which helps improve the overall quality and performance of the film. The entire cooling process is continuous and efficient, ensuring that the water-cooled rollers are always kept at a low temperature level, improving the cooling effect on the plastic film. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention from a first angle; Figure 2 This is a three-dimensional structural diagram of the present invention from a second angle; Figure 3 This is a schematic diagram of the three-dimensional structure of the protective shell of this utility model after it is concealed. Figure 4 In this utility model Figure 3 A magnified structural diagram of part A.

[0015] In the diagram: 1. Workbench; 2. Upper water-cooling roller; 3. Lower water-cooling roller; 4. Support leg; 5. Mounting frame; 6. Refrigeration box; 7. Bearing; 8. Inlet pipe; 9. First diversion pipe; 10. Outlet pipe; 11. Second diversion pipe; 12. Pump body; 13. Protective shell; 14. Drive gear; 15. Driven gear; 16. Drive motor; 17. Horizontal pipe; 18. Support plate. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figure 1-4A multi-layer co-extrusion plastic film blow molding equipment includes a worktable 1, an upper water-cooled roller 2, a lower water-cooled roller 3, a cooling device, and a driving device. Support legs 4 are installed at the four corners of the bottom wall of the worktable 1. A mounting frame 5 is installed on the top wall of the worktable 1. Multiple sets of the upper water-cooled rollers 2 are installed above the mounting frame 5, and multiple sets of the lower water-cooled rollers 3 are rotatably installed below the mounting frame 5. The driving device is installed at one end of each of the upper and lower water-cooled rollers 2 and 3, penetrating the side wall of the mounting frame 5. The upper and lower water-cooled rollers 2 and 3 are cyclically connected through the cooling device. In this embodiment, firstly, ensure that all components are correctly installed and connected. Before starting, check whether the water cooling system is operating normally and whether the drive device can smoothly drive the upper water-cooled roller 2 and the lower water-cooled roller 3 to rotate. During use, the molten plastic material coming out of the multi-layer co-extrusion die will form a tubular film bubble. After being initially cooled by the air ring, this film bubble will be guided between the upper water-cooled roller 2 and the lower water-cooled roller 3. The upper water-cooled roller 2 and the lower water-cooled roller 3 are connected through the drive device. Driven by the system, the film bubble enters the space formed by the upper water-cooled roller 2 and the lower water-cooled roller 3. These water-cooled rollers rapidly remove heat through an internally circulating cooling medium, allowing the film to cool and set quickly. The relative rotation of the upper and lower water-cooled rollers 3 helps to apply pressure evenly to the film, further improving cooling efficiency and flatness. After cooling and setting, the film is flattened and moves along the production line to the next processing equipment. The combination of upper water-cooled roller 2 and lower water-cooled roller 3 can significantly improve cooling efficiency and reduce cooling time, thereby accelerating production speed. Since the water-cooled rollers can provide uniform and effective cooling, this helps to reduce stress concentration in the film, reduce the risk of deformation, and thus improve the quality and flatness of the film. By precisely controlling the rotation speed of the upper water-cooled roller 2 and the lower water-cooled roller 3 through the drive device, the tension and thickness of the film can be adjusted as needed, improving production flexibility and product stability. Compared with traditional cooling methods, the application of the water-cooling system not only improves cooling efficiency but also better manages energy consumption, achieving a more environmentally friendly production process.

[0018] Preferably, in this embodiment, the cooling device includes a refrigeration box 6, a bearing 7, an inlet pipe 8, a first branch pipe 9, an outlet pipe 10, a second branch pipe 11, and a pump body 12. The refrigeration box 6 is installed on the bottom wall of the workbench 1. Two sets of inlet pipes 8 are installed at one end of the refrigeration box 6. The pump body 12 is installed on the outer wall of the inlet pipes 8. The outlet end of each set of inlet pipes 8 is equipped with a first branch pipe 9. The ends of multiple sets of first branch pipes 9 are connected to the upper water-cooled roller 2 or the lower water-cooled roller 3 through the bearing 7, passing through the drive device and the side wall of the mounting frame 5. The liquid outlet pipe 10 is installed on the other side wall of the refrigeration box 6. Multiple sets of second diversion pipes 11 are installed at the end of the liquid outlet pipe 10. The ends of the multiple sets of second diversion pipes 11 are connected to the upper water-cooled roller 2 or the lower water-cooled roller 3 via bearings 7 through the side wall of the mounting frame 5. First, the cooled coolant in the refrigeration box 6 is pressurized by the pump body 12 and transported to the first diversion pipe 9 through the liquid inlet pipe 8. These diversion pipes distribute the coolant to each of the upper water-cooled roller 2 and the lower water-cooled roller 3. The coolant safely passes through the drive device and the side wall of the mounting frame 5 through the bearing 7 structure and enters the water-cooled roller. Inside, the coolant enters the upper water-cooling roller 2 and the lower water-cooling roller 3, forming a closed circulation system. As the drive device rotates the upper water-cooling roller 2 and the lower water-cooling roller 3, the coolant comes into full contact with the inner wall of the water-cooling roller, thus effectively absorbing heat. During this process, the coolant flows from one end of the upper water-cooling roller 2 and the lower water-cooling roller 3 to the other end, and returns to the outlet pipe 10 through the second diversion pipe 11. The coolant collected through the second diversion pipe 11 returns to the refrigeration tank 6 through the outlet pipe 10, where it is cooled again to prepare for the next cycle. The entire process is continuous. Furthermore, it is highly efficient, ensuring that the water-cooled rollers are always kept at a low temperature level. Due to the low surface temperature of the water-cooled rollers, they can quickly remove heat from the film, allowing the film to cool and set rapidly. This not only improves production efficiency but also ensures the quality and flatness of the film. By precisely controlling the flow rate and temperature of the coolant, rapid and uniform cooling of the plastic film can be achieved, greatly shortening the cooling time and improving production efficiency. The design of the cooling device ensures that all water-cooled rollers are uniformly cooled, avoiding problems such as local overheating or insufficient cooling, which helps to improve the overall quality and performance of the film.

[0019] Preferably, in this embodiment, the driving device includes a protective shell 13, a driving gear 14, a driven gear 15, and a drive motor 16. Two sets of protective shells 13 are mounted on the mounting bracket 5 near the liquid inlet pipe 8, one above the other. The driving gear 14 is rotatably mounted inside each set of protective shells 13. One end of each driving gear 14 continuously meshes with multiple sets of driven gears 15. The drive motor 16 is mounted on the side wall of the protective shell 13, and its output end passes through the side wall of the protective shell 13 and connects to the driving gear 14. When the production line starts, both sets of drive motors 16 begin to work, and their output ends drive the driving gear 14 to rotate. When the drive gear 14 rotates, it continuously engages multiple driven gears 15. Each driven gear 15 is connected to one end of an upper water-cooling roller 2 or a lower water-cooling roller 3. In this way, the rotation of the drive gear 14 can be transmitted to each water-cooling roller through the driven gears 15, driving them to rotate. With the precise transmission between the drive gear 14 and the driven gears 15, the upper water-cooling roller 2 and the lower water-cooling roller 3 begin to rotate at a predetermined speed and direction. These water-cooling rollers not only help to quickly remove heat from the film, but also make the film smoother and more uniform through the pressure applied to their surface. Throughout the production process, the working status and speed of the drive motor 16 can be monitored in real time by the control system, and fine adjustments can be made as necessary to adapt to different production needs.

[0020] Preferably, in this embodiment, a horizontal pipe 17 is installed at the end of the liquid inlet pipe 8 and the liquid outlet pipe 10 away from the refrigeration box 6. The top ends of the two sets of horizontal pipes 17 are connected to the bottom ends of the corresponding first distribution pipe 9 or second distribution pipe 11. By using the horizontal pipes 17 to connect the liquid inlet pipe 8 or the liquid outlet pipe 10 to the first distribution pipe 9 and the second distribution pipe 11, the installation process of the entire cooling system can be greatly simplified. This design makes the connection between the components more intuitive and direct, reducing the complex piping layout work. When it is necessary to repair or replace a part of the system, this modular design allows for easier access and operation of the relevant components. For example, if a section of the distribution pipe has a problem, it can be quickly repaired by disconnecting the horizontal pipe 17 connection without disassembling the entire cooling system. The design of the horizontal pipes 17 helps to ensure that the coolant can be evenly distributed to each upper water-cooled roller 2 and lower water-cooled roller 3. By reasonably arranging the horizontal pipes 17, the coolant can reach a relatively balanced state before entering the distribution pipe, thereby improving the cooling effect.

[0021] Preferably, in this embodiment, the drive motor 16 is a servo motor. The servo motor can achieve extremely precise position control, which is crucial for ensuring the accurate rotation of the upper water-cooling roller 2 and the lower water-cooling roller 3. This means that the speed at which the film passes through the cooling zone can be adjusted very precisely.

[0022] Preferably, in this embodiment, the mounting frame 5 is U-shaped. The U-shaped design usually provides a large open space, which facilitates the installation, disassembly and daily adjustment of the upper water-cooling roller 2 and the lower water-cooling roller 3 by workers. This not only improves work efficiency but also reduces the difficulty of operation.

[0023] Preferably, in this embodiment, a support plate 18 is installed between the four sets of support legs 4 to support the refrigeration box 6. The support plate 18 provides additional support points for the refrigeration box 6, increasing the stability of the bottom structure of the entire device.

[0024] Preferably, in this embodiment, the left and right sidewalls of the workbench 1 are designed with rounded corners. The rounded corner design reduces the presence of sharp edges and prevents the plastic film from contacting the corners of the workbench 1 and causing damage.

[0025] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-layer co-extruded plastic film blow molding equipment, comprising a worktable (1), an upper water-cooled roller (2), a lower water-cooled roller (3), a cooling device, and a driving device, characterized in that: Support legs (4) are installed at the four corners of the bottom wall of the workbench (1). A mounting frame (5) is installed on the top wall of the workbench (1). Multiple sets of upper water-cooling rollers (2) are installed in the upper part of the mounting frame (5). Multiple sets of lower water-cooling rollers (3) are rotatably installed in the lower part of the mounting frame (5). One end of the upper water-cooling roller (2) and the lower water-cooling roller (3) penetrates the side wall of the mounting frame (5) and is equipped with the driving device. The left and right ends of the upper water-cooling roller (2) and the lower water-cooling roller (3) are circulatedly connected through the cooling device.

2. The multilayer co-extrusion plastic film blow molding equipment according to claim 1, characterized in that: The cooling device includes a refrigeration box (6), a bearing (7), an inlet pipe (8), a first branch pipe (9), an outlet pipe (10), a second branch pipe (11), and a pump body (12). The refrigeration box (6) is installed on the bottom wall of the workbench (1). Two sets of inlet pipes (8) are installed at one end of the refrigeration box (6). The pump body (12) is installed on the outer wall of the inlet pipes (8). The outlet end of each set of inlet pipes (8) is equipped with a first branch pipe (9). Multiple sets of first branch pipes The ends of (9) are all connected to the upper water-cooling roller (2) or the lower water-cooling roller (3) through the side wall of the drive device and the mounting frame (5) via bearings (7). The other side wall of the refrigeration box (6) is equipped with the liquid outlet pipe (10). The end of the liquid outlet pipe (10) is equipped with multiple sets of the second diversion pipes (11). The ends of the multiple sets of the second diversion pipes (11) are connected to the upper water-cooling roller (2) or the lower water-cooling roller (3) through the side wall of the mounting frame (5) via bearings (7).

3. The multilayer co-extrusion plastic film blow molding equipment according to claim 2, characterized in that: The drive device includes a protective shell (13), a drive gear (14), a driven gear (15), and a drive motor (16). Two sets of the protective shells (13) are installed on the upper and lower ends of the mounting bracket (5) near the liquid inlet pipe (8). The drive gear (14) is rotatably installed inside each set of the protective shells (13). One end of the drive gear (14) is continuously engaged with multiple sets of driven gears (15). The drive motor (16) is installed on the side wall of the protective shell (13). The output end of the drive motor (16) passes through the side wall of the protective shell (13) and is connected to the drive gear (14).

4. The multilayer co-extrusion plastic film blow molding equipment according to claim 3, characterized in that: Both the inlet pipe (8) and the outlet pipe (10) are equipped with horizontal pipes (17) at the ends away from the refrigeration box (6). The top ends of the two sets of horizontal pipes (17) are connected to the bottom ends of the corresponding first diversion pipe (9) or second diversion pipe (11).

5. The multilayer co-extrusion plastic film blow molding equipment according to claim 4, characterized in that: The drive motor (16) is a servo motor.

6. The multilayer co-extrusion plastic film blow molding equipment according to claim 5, characterized in that: The mounting bracket (5) has a U-shaped design.

7. The multilayer co-extrusion plastic film blow molding equipment according to claim 6, characterized in that: A support plate (18) supporting the refrigeration box (6) is installed between the four sets of support legs (4).

8. The multilayer co-extrusion plastic film blow molding equipment according to claim 7, characterized in that: The left and right sidewalls of the workbench (1) are both designed with rounded corners.

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