A circulating cooling device for co-extrusion film production

Abstract

The utility model relates to the field of coextrusion film production technology, and specifically relates to a circulating cooling device for coextrusion film production, which comprises a cooling box, support shafts and fan blades, the inner wall of the cooling box is provided with support shafts arranged in a rectangular array, the outer side of the support shafts is provided with support rollers, the outer wall of the support rollers is welded with heat-conducting sheets arranged in a circular array, the outer wall of the heat-conducting sheets is provided with ventilation holes arranged in a circular array, the outer wall of the support rollers on both sides is welded with fan blades arranged in a circular array, the outer wall of the fan blades is welded with a support ring, the outer wall of the support ring is connected with cooling rollers through screws, the outer wall of the cooling rollers is provided with exhaust holes arranged in a circular array, the device can air-cool the parts of the coextrusion film that are not in contact with the cooling rollers, achieves the purpose of further cooling the coextrusion film, and can significantly improve the cooling completeness and cooling efficiency of the coextrusion film without changing the winding speed of the coextrusion film.

Description

Technical Field

[0001] This utility model relates to the field of co-extrusion film production technology, specifically to a circulating cooling device for co-extrusion film production. Background Technology

[0002] Co-extruded film, also known as co-extruded film, is a special plastic packaging material formed by simultaneously melting and blending multiple polymers during the extrusion process to create a single multi-layer structure. Common co-extruded film structures have three, five, or more layers, each with a specific function, such as blocking oxygen, moisture, and light, thereby protecting the quality of the contents. All layers of the co-extruded film are extruded and formed at the same time, and the layers are bonded together by heat fusion without the need for adhesives. Co-extruded film is composed entirely of plastic materials and does not contain aluminum foil, paper, or other non-plastic materials.

[0003] In the co-extrusion film production process, the molten polymer needs to be rapidly cooled and shaped after extrusion to ensure the structural stability, mechanical properties (such as tensile strength and transparency) and dimensional accuracy of the film. The circulating cooling system controls the temperature uniformity and cooling rate to avoid problems such as deformation, crystal points or uneven thickness caused by local overheating of the film. The cooling device is located between the extrusion equipment and the winding equipment.

[0004] While existing cooling devices offer numerous benefits during use, they still suffer from several drawbacks. Their cooling of the extruded film is insufficient. Existing extruded films typically achieve heat exchange and cooling through contact with the surface of the cooling rollers. However, in actual production, to ensure production efficiency, the winding speed is usually between 100-200 m / min. This higher winding speed results in a shorter contact time between the extruded film and the cooling rollers, affecting the cooling effect and leading to the production of defective products. Utility Model Content

[0005] To address the problems in the prior art, this utility model provides a circulating cooling device for co-extruded film production.

[0006] The technical solution adopted by this utility model to solve its technical problem is a circulating cooling device for co-extrusion film production, including a cooling box, a support shaft and fan blades. The inner wall of the cooling box is provided with a rectangular array of support shafts, and a support roller is provided on the outer side of the support shafts. The outer wall of the support roller is welded with a circular array of heat-conducting plates, and the outer wall of the heat-conducting plates is provided with a circular array of ventilation holes. The outer walls of both sides of the support roller are welded with a circular array of fan blades, and the outer wall of the fan blades is welded with a support ring. The outer wall of the support ring is screwed to a cooling roller, and the outer wall of the cooling roller is provided with a circular array of exhaust holes.

[0007] By adopting the above technical solution, the pipeline of the external coolant circulation device is connected to the support shaft through a rotary joint, so that the coolant circulates inside the support shaft and support roller. The heat-conducting plate can transfer temperature between the support roller and the cooling roller. When the co-extruded film moves outside the cooling roller, it is cooled by contact through heat exchange, thus achieving the purpose of cooling the co-extruded film. When the co-extruded film moves on the surface of the cooling roller, the friction will carry the cooling roller through the support roller and support shaft to rotate. When the fan blades follow the rotation of the support roller, they will drive the air flow, causing the air inside the cooling box to flow between the support roller and the cooling roller. The airflow flows inside the ventilation hole, so that the airflow temperature is the same as the surface temperature of the support roller. When the airflow is discharged through the exhaust hole and the flow direction is changed and gathered by the wind hood, the cooled airflow can flow to both sides of the cooling roller, thereby providing air cooling to the co-extruded film part in contact with the cooling roller, achieving the purpose of further cooling the co-extruded film. It can significantly improve the cooling thoroughness and cooling efficiency of the co-extruded film without changing the winding speed of the co-extruded film.

[0008] Specifically, the cooling box has material inlets on both outer walls, and guide rollers are pin-connected to both inner walls of the material inlets. A cover plate is screwed to the upper outer wall of the cooling box.

[0009] By adopting the above technical solution, the feed port restricts the position of the co-extruded film entering the cooling box, and the guide roller reduces the frictional resistance of the co-extruded film feeding and discharging, ensuring the smooth feeding and discharging of the co-extruded film. The cover plate shields and seals the inside of the cooling box, reducing the influence of the external environment on the internal temperature of the cooling box.

[0010] Specifically, connecting seats are symmetrically welded to the outer walls of both sides of the support roller, and the connecting seats are screwed to the support shaft.

[0011] By adopting the above technical solution, the connecting seat can connect the support roller and the support shaft, ensuring the connection strength between the support roller and the support shaft. The support shaft and the cooling box are connected by ball bearings, which can ensure the stability and smooth rotation of the support shaft inside the cooling box.

[0012] Specifically, both the support shaft and the support roller have a hollow interior design. A rotary joint is threaded onto one side of the inner wall of the support shaft, and the rotary joint is located outside the cooling box. Sealing rings are bonded and fixed to both outer walls of the support roller, and the sealing rings are in contact with the outer wall of the support shaft.

[0013] By adopting the above technical solution, the rotary joint ensures that the support shaft can rotate relative to the circulation pipeline, avoiding the rotation of the support shaft from affecting the circulation pipeline. The coolant can circulate inside the support shaft and support roller, maintaining the temperature of the support roller and cooling roller, ensuring the cooling of the co-extruded film by the cooling roller. The sealing ring ensures the sealing between the support roller and the support shaft, ensuring the flow sealing of the coolant.

[0014] Specifically, the heat-conducting sheet adopts a spiral shape design, and a thermally conductive silicone pad is bonded and fixed to the outer wall of the heat-conducting sheet. The thermally conductive silicone pad is in contact with the inner wall of the cooling roller.

[0015] By adopting the above technical solution, the thermally conductive silicone pad ensures the contact seal between the thermally conductive sheet and the inner wall of the cooling roller, reducing thermal resistance. In turn, the spiral thermally conductive sheet ensures the temperature transfer efficiency between the cooling roller and the support roller, guaranteeing the heat exchange efficiency and cooling effect of the cooling roller.

[0016] Specifically, both sides of the inner wall of the cooling box are screwed with air-concentrating hoods, which are designed in an arc shape and are located outside the cooling roller.

[0017] By adopting the above technical solution, the air flowing inside the heat-conducting sheet is discharged through the exhaust hole. The airflow impacts the inner wall of the air-collecting hood, and the arc shape of the air-collecting hood concentrates and guides the airflow, causing the airflow to flow towards the co-extruded film, preventing the airflow from forming turbulence inside the cooling box, and ensuring the utilization rate of the airflow after cooling.

[0018] The beneficial effects of this utility model are:

[0019] The circulating cooling device for co-extruded film production described in this utility model discharges air through the exhaust hole and is then changed in flow direction and concentrated by the air-gathering hood. This allows the cooled air to flow to both sides of the cooling roller, thereby providing air cooling to the co-extruded film parts that are not in contact with the cooling roller. This achieves the purpose of further cooling the co-extruded film and can significantly improve the thoroughness and efficiency of cooling the co-extruded film without changing the winding speed of the co-extruded film.

[0020] The present invention discloses a circulating cooling device for co-extruded film production. The heat-conducting sheet can transfer temperature between the support roller and the cooling roller. When the co-extruded film moves outside the cooling roller, it is cooled by contact with the cooling roller, thereby achieving the purpose of cooling the co-extruded film. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the main structure of the cooling box of this utility model;

[0023] Figure 2 This is an exploded view of the cooling box structure of this utility model;

[0024] Figure 3 This is an exploded view of the support shaft structure of this utility model;

[0025] Figure 4 This is an exploded view of the support roller structure of this utility model.

[0026] In the diagram: 1. Cooling box; 11. Cover plate; 12. Material inlet; 13. Guide roller; 14. Air duct; 2. Support shaft; 21. Rotary joint; 22. Support roller; 23. Connecting seat; 24. Sealing ring; 25. Heat-conducting plate; 26. Ventilation hole; 3. Fan blade; 31. Support ring; 32. Cooling roller; 33. Exhaust hole. Detailed Implementation

[0027] 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.

[0028] To save manpower and improve efficiency, as one embodiment of this utility model, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the circulating cooling device for co-extruded film production of this utility model includes a cooling box 1, a support shaft 2, and fan blades 3. The inner wall of the cooling box 1 is provided with a rectangular array of support shafts 2, and a support roller 22 is provided on the outer side of the support shafts 2. A circular array of heat-conducting plates 25 are welded to the outer wall of the support roller 22, and a circular array of ventilation holes 26 are opened on the outer wall of the heat-conducting plates 25. A circular array of fan blades 3 are welded to the outer walls of both sides of the support roller 22, and a support ring 31 is welded to the outer wall of the fan blades 3. A cooling roller 32 is screwed to the outer wall of the support ring 31, and an exhaust hole 33 with a circular array of ventilation holes is opened on the outer wall of the cooling roller 32.

[0029] In use, the external coolant circulation device's piping is connected to the support shaft 2 via a rotary joint 21, allowing the coolant to circulate within the support shaft 2 and support roller 22. The heat-conducting fins 25 transfer temperature between the support roller 22 and the cooling roller 32. When the co-extruded film moves outside the cooling roller 32, it is cooled through contact with the cooling roller 32, achieving the purpose of cooling the co-extruded film. As the co-extruded film moves on the surface of the cooling roller 32, friction causes the cooling roller 32 to rotate circumferentially through the support roller 22 and support shaft 2. The fan blades 3 follow the rotation of the support roller 22. When rotating, it drives airflow, causing the air inside the cooling box 1 to flow between the support roller 22 and the cooling roller 32. The airflow flows inside the ventilation hole 26, making the airflow temperature the same as the surface temperature of the support roller 22. When the airflow is discharged through the exhaust hole 33 and its flow direction is changed and gathered by the wind shroud 14, it can cause the cooled airflow to flow to both sides of the cooling roller 32, thereby providing air cooling to the co-extruded film parts that are not in contact with the cooling roller 32, achieving the purpose of further cooling the co-extruded film. It can significantly improve the thoroughness and efficiency of cooling the co-extruded film without changing the winding speed of the co-extruded film.

[0030] For example, for feeding and discharging materials, such as Figure 2 As shown, both sides of the outer wall of the cooling box 1 are provided with material outlets 12, and both sides of the inner wall of the material outlets 12 are connected with guide rollers 13 by pins. The upper outer wall of the cooling box 1 is screwed with a cover plate 11.

[0031] During use, the feed port 12 restricts the position of the co-extruded film entering the cooling box 1, and the guide roller 13 reduces the frictional resistance of the co-extruded film feeding and discharging, ensuring the smooth feeding and discharging of the co-extruded film. The cover plate 11 shields and seals the inside of the cooling box 1, reducing the influence of the external environment on the internal temperature of the cooling box 1.

[0032] To maintain connection strength, for example, such as Figure 3 As shown, connecting seats 23 are symmetrically welded to the outer walls of both sides of the support roller 22, and the connecting seats 23 are screwed to the support shaft 2.

[0033] In use, the connecting seat 23 can connect the support roller 22 and the support shaft 2 to ensure the connection strength between the support roller 22 and the support shaft 2. The support shaft 2 is connected to the cooling box 1 through ball bearings, which can ensure the stability and smooth rotation of the support shaft 2 inside the cooling box 1.

[0034] For coolant flow, exemplarily, such as Figure 3 As shown, both the support shaft 2 and the support roller 22 have a hollow design. A rotary joint 21 is threaded to one side of the inner wall of the support shaft 2. The rotary joint 21 is located outside the cooling box 1. Sealing rings 24 are glued and fixed to both outer walls of the support roller 22. The sealing rings 24 are in contact with the outer wall of the support shaft 2.

[0035] During use, the rotary joint 21 ensures that the support shaft 2 can rotate relative to the circulation pipeline, preventing the rotation of the support shaft 2 from affecting the circulation pipeline. The coolant can circulate inside the support shaft 2 and the support roller 22 to maintain the temperature of the support roller 22 and the cooling roller 32, ensuring that the cooling roller 32 cools the co-extruded film. The sealing ring 24 ensures the sealing between the support roller 22 and the support shaft 2, and ensures the flow of the coolant.

[0036] For heat conduction, for example, such as Figure 4 As shown, the heat-conducting sheet 25 adopts a spiral shape design, and a thermally conductive silicone pad is bonded to the outer wall of the heat-conducting sheet 25. The thermally conductive silicone pad is in contact with the inner wall of the cooling roller 32.

[0037] During use, the thermally conductive silicone pad ensures the contact seal between the thermally conductive sheet 25 and the inner wall of the cooling roller 32, reducing thermal resistance. This, in turn, ensures the temperature transfer efficiency between the cooling roller 32 and the support roller 22 through the spiral thermally conductive sheet 25, thereby guaranteeing the heat exchange efficiency and cooling effect of the cooling roller 32.

[0038] For air cooling, for example, such as Figure 2 As shown, both sides of the inner wall of the cooling box 1 are screwed with a concentrator 14. The concentrator 14 adopts an arc shape design and is located outside the cooling roller 32.

[0039] During use, the air flowing inside the heat-conducting plate 25 is discharged through the exhaust hole 33. The airflow impacts the inner wall of the air-concentrating shroud 14. Due to the arc shape of the air-concentrating shroud 14, the airflow is concentrated and guided, causing the airflow to flow towards the co-extruded film, preventing the airflow from forming turbulence inside the cooling box 1, and ensuring the utilization rate of the airflow after cooling.

[0040] When this utility model is in use, the external cooling water circulation device is connected to the rotary joint 21 through the pipeline, thereby injecting coolant into the hollow support shaft 2 and support roller 22. The co-extruded film is introduced from the extruder into the cooling box 1 through the feed port 12 and guided to the surface of the cooling roller 32 by the guide roller 13.

[0041] The coolant circulates inside the support roller 22 and transfers the cooling energy to the cooling roller 32 through the spiral heat-conducting plate 25 and the heat-conducting silicone pad. When the film material comes into contact with the cooling roller 32, the heat is quickly transferred to the coolant through conduction, thereby achieving cooling.

[0042] Under the traction of the winding equipment, the co-extruded film moves at a set speed on the surface of the cooling roller 32. The frictional force drives the cooling roller 32, the support ring 31, the fan blade 3, and the support roller 22 to rotate synchronously. The rotation of the fan blade 3 generates centrifugal force, which causes air in the cooling box 1 to be drawn into the gap between the support roller 22 and the cooling roller 32 through the ventilation hole 26. The drawn-in air comes into contact with the low-temperature heat-conducting sheet 25, and the temperature drops to close to the temperature of the coolant. The cold air is discharged through the exhaust hole 33 and is guided by the air shroud 14 to be concentrated and blown onto the surface of the film material, forming secondary air cooling.

[0043] It should be noted that this utility model is a circulating cooling device for co-extruded film production. All components in this utility model are known to those skilled in the art, and their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0044] 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 descriptions of the above embodiments and specifications 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 protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A circulating cooling device for co-extruded film production, characterized in that, The device includes a cooling box (1), a support shaft (2), and fan blades (3). The inner wall of the cooling box (1) is provided with a support shaft (2) arranged in a rectangular array. The outer side of the support shaft (2) is provided with a support roller (22). The outer wall of the support roller (22) is welded with a heat-conducting plate (25) arranged in a circular array. The outer wall of the heat-conducting plate (25) is provided with a ventilation hole (26) arranged in a circular array. The outer walls on both sides of the support roller (22) are welded with fan blades (3) arranged in a circular array. The outer wall of the fan blades (3) is welded with a support ring (31). The outer wall of the support ring (31) is screwed to a cooling roller (32). The outer wall of the cooling roller (32) is provided with an exhaust hole (33) arranged in a circular array.

2. The circulating cooling device for co-extruded film production according to claim 1, characterized in that, The cooling box (1) has material outlets (12) on both sides of its outer wall. The material outlets (12) are connected to guide rollers (13) on both sides of their inner walls by pins. The cooling box (1) has a cover plate (11) screwed to its upper outer wall.

3. The circulating cooling device for co-extruded film production according to claim 1, characterized in that, The outer walls of both sides of the support roller (22) are symmetrically welded with connecting seats (23), and the connecting seats (23) are screwed to the support shaft (2).

4. The circulating cooling device for co-extruded film production according to claim 1, characterized in that, The support shaft (2) and the support roller (22) are both hollow. A rotary joint (21) is threaded on one side of the inner wall of the support shaft (2). The rotary joint (21) is located outside the cooling box (1). Sealing rings (24) are glued and fixed on both sides of the outer wall of the support roller (22). The sealing rings (24) are in contact with the outer wall of the support shaft (2).

5. A circulating cooling device for co-extruded film production according to claim 1, characterized in that, The heat-conducting sheet (25) adopts a spiral shape design. A heat-conducting silicone pad is bonded to the outer wall of the heat-conducting sheet (25). The heat-conducting silicone pad is in contact with the inner wall of the cooling roller (32).

6. A circulating cooling device for co-extruded film production according to claim 1, characterized in that, Both sides of the inner wall of the cooling box (1) are screwed with a wind-gathering hood (14). The wind-gathering hood (14) adopts an arc shape design and is located outside the cooling roller (32).

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