A thick film high-speed extrusion cooling forming process based on internal and external collaborative cooling

Abstract

The present application relates to a kind of thick film high-speed extrusion cooling forming process based on inside and outside collaborative cooling in the technical field of packaging film embryo production, comprising the following steps: extrusion film embryo: after the raw material resin of ripening is melted by extruder high temperature, the cylindrical film embryo extruded from top to bottom from extrusion head;Film embryo outer cooling: the extruded film embryo is directly downward into the cooling water with water temperature of 0 ℃ to 4 ℃, and at the first position, the second position and the third position below the liquid level of film embryo outer cooling water, different temperature cooling water is respectively sprayed to the outer surface of the film embryo;Film embryo inner cooling: cooling water is filled into the inside of the film embryo from the opening end of the film embryo, and the heat exchange pipe in water circulation system is used to circulate cooling water in the film embryo.The present application efficiently and uniformly takes away the large amount of heat accumulated in thick film during high-speed extrusion by the synergistic effect of multi-stage outer cooling and internal active circulation cooling, prevents the boiling phenomenon of cooling water in the film embryo, and greatly improves the production efficiency.

Description

Technical Field

[0001] This invention relates to the field of packaging film preform production technology, and in particular to a high-speed extrusion cooling molding process for thick films based on internal and external synergistic cooling. Background Technology

[0002] Thick film extrusion molding is widely used in the field of polymer material processing, especially in the production of high-strength, high-barrier packaging films. In this process, molten resin is extruded from a toroidal extruder to form a cylindrical preform, which then needs to be cooled and solidified. The uniformity and efficiency of the cooling process directly determine the physical properties, surface finish, and production speed of the final product.

[0003] Currently, the industry generally uses water cooling to cool the extruded preform, which involves passing the preform through an external cooling water tank and injecting cooling water into the preform to achieve double-sided cooling.

[0004] However, existing cooling processes have many limitations: First, the low cooling efficiency severely limits the production speed: Since the thickness of the preform with a finished product thickness of 80μm is usually more than 190μm (e.g., about 200μm) during extrusion, compared with ordinary membranes (the finished product thickness is generally 40-45μm, and the thickness during extrusion is generally 130μm), the heat dissipation path is longer and the heat capacity is significantly increased. If the internal water is cooled by natural heat exchange between the preform and the external water tank, the heat will accumulate rapidly. This causes the temperature of the cooling water inside the preform to rise to the boiling point very easily when trying to increase the extrusion speed, resulting in local boiling and the preform quality being unqualified.

[0005] Secondly, even at lower extrusion speeds, it is difficult to achieve uniform, gradient cooling of the preform from the surface to the core using a two-stage external jet cooling system. Residual heat in the preform core may cause minor localized deformations or wrinkles in subsequent processes, affecting the flatness and uniformity of the preform's mechanical properties.

[0006] In addition, at the equipment level, traditional extruders tend to accumulate degraded resin (accumulated material) at the discharge port during long-term continuous production. This accumulated material may detach and adhere to the surface of the preform, forming defects such as black spots.

[0007] Therefore, the present invention provides a high-speed extrusion cooling molding process for thick films based on internal and external synergistic cooling. Summary of the Invention

[0008] To overcome the shortcomings of the prior art, the present invention discloses a high-speed extrusion cooling molding process for thick films based on internal and external synergistic cooling.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: A high-speed thick film extrusion cooling molding process based on synergistic internal and external cooling includes the following steps: Extruded film preform: After the matured raw material resin is melted at high temperature in an extruder, a cylindrical film preform with a temperature of 160℃ to 190℃ and a thickness of not less than 190μm is extruded from top to bottom through the extruder head. External cooling of the membrane preform: The extruded membrane preform is inserted directly downwards into cooling water with a temperature of 0°C to 4°C, and cooling water of different temperatures is sprayed onto the outer surface of the membrane preform at three positions below the surface of the external cooling water: the first position is 20mm to 30mm below the surface of the liquid, and the sprayed cooling water has a temperature of 0°C to 1°C; the second position is 45mm to 50mm below the surface of the liquid, and the sprayed cooling water has a temperature of 3.5°C to 4.5°C; the third position is 60mm to 70mm below the surface of the liquid, and the sprayed cooling water has a temperature of 5°C to 8°C. Internal cooling of the membrane preform: Cooling water is injected into the membrane preform from the open end, so that the liquid level of the internal cooling water is 10 mm to 30 mm higher than the liquid level of the external cooling water. The internal cooling water is circulated and cooled by heat exchange tubes in the water circulation system, and the temperature of the internal cooling water is controlled at 8°C to 12°C.

[0010] Furthermore, in the external cooling step of the preform, the extrusion speed V1 of the preform is between 4 m / min and 6 m / min.

[0011] Furthermore, the extrusion speed V1 of the preform and the cooling water jet speed V2 at the first position satisfy the first proportional relationship: R1=V1 / V2; Where R1 is a constant between 8.0 and 10.0, V1 is in m / min, and V2 is in m / s.

[0012] Furthermore, the extrusion speed V1 of the preform and the cooling water jet speed V3 at the second position satisfy the second proportional relationship: R2=V1 / V3; Where R2 is a constant between 6.5 and 8.5, V1 is in m / min, and V3 is in m / s.

[0013] Furthermore, the extrusion speed V1 of the preform and the cooling water jet speed V4 at the third position satisfy the third proportional relationship: R3=V1 / V4; Where R3 is a constant between 5.5 and 7.5; V4 is in m / s.

[0014] Furthermore, the extrusion speed V1 of the membrane preform and the flow rate Q of the cooling water flowing through the heat exchange tube satisfy the fourth proportional relationship: R4=V1 / Q; Where R4 is a constant between 5 and 7; Q is in units of L / s.

[0015] Furthermore, the extrusion head has an extrusion channel inside, the extrusion channel including an upper conical section and a lower cylindrical section that are connected to each other; The extrusion head has an inlet pipe and an outlet pipe that are sealed and penetrate through the side wall corresponding to the upper end of the lower cylindrical section; The inner ends of the inlet and outlet pipes are connected to heat exchange tubes located inside the membrane preform, and the outer ends are connected to a cooling water source.

[0016] Furthermore, the inlet pipe and outlet pipe are provided with a heat insulation layer in at least the section corresponding to the extrusion channel.

[0017] Furthermore, the inner edge of the discharge port of the lower cylindrical section is higher than the outer edge; the inner edge is provided with a guiding slope to guide the accumulated material away from the discharge port.

[0018] Furthermore, it also includes a temperature sensor for detecting the temperature of the cooling water inside the membrane preform; The temperature sensor is communicatively connected to the cooling water source; The cooling water source is configured to adjust the flow rate of cooling water input to the heat exchange tube based on the temperature information detected by the temperature sensor.

[0019] Compared with the prior art, the beneficial effects of the present invention are: 1. As can be seen from Comparative Example 1, under the traditional cooling method, the extrusion speed is limited to about 3.5m / min in order to ensure the basic pass rate. However, the present invention, through the synergistic effect of multi-stage external cooling and internal active circulation cooling, efficiently and evenly removes a large amount of heat accumulated in the thick film during high-speed extrusion, prevents the cooling water in the preform from boiling, and successfully increases the extrusion speed to 5-6m / min, which greatly improves production efficiency. 2. By applying cooling water sprays at different temperatures at three different depths, gradient cooling and precise temperature control of the preform were achieved. Combined with precise closed-loop control of the internal cooling water, local boiling of the cooling water inside the preform was fundamentally prevented. According to the data from Example 1, at a speed of 5.0 m / min, the area rate of defective areas can be controlled at 0% when producing 1500 meters continuously. Compared with Comparative Example 3, where only two-stage external cooling was used, the defect rate was still 1.0%. This proves that the three-stage cooling system is crucial for eliminating micro-wrinkles caused by residual heat, thereby ensuring the smoothness of the preform surface and eliminating the generation of bubbles and wrinkles. 3. By establishing the proportional relationship between the extrusion speed and the cooling water jet speed at each position, as well as the proportional relationship with the internal cooling water flow rate, precise matching of process parameters was achieved. Combined with the data from Example 2, it is shown that by controlling the internal cooling proportional constant R4 between 5 and 7, the cooling water temperature inside the preform can be stably maintained within the target range of 8-12℃ under different extrusion speeds. This effectively avoids the risk of thermal runaway and makes process debugging based on evidence, significantly improving the stability, repeatability, and consistency between different production lines of the production process. 4. By setting a guiding slope on the inner edge of the discharge port of the lower cylindrical section of the extruder head, the accumulated material can be effectively guided away from the discharge port. In comparison with Comparative Example 2, without this structure, black spots and longitudinal fine lines will appear after more than ten hours of continuous production. The structure of this invention fundamentally eliminates this hidden danger, ensuring that the equipment can maintain high-quality output during long-term continuous operation, reducing maintenance frequency and the risk of defective products. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an extruder head in the prior art; Figure 2 This is a schematic diagram of the extrusion head in this invention; Figure 3 This is a schematic diagram showing the distribution of the jet water pipe and the membrane embryo in this invention.

[0021] In the diagram: 1. Upper conical section; 2. Lower cylindrical section; 3. Inlet pipe; 4. Outlet pipe; 5. Heat exchanger pipe; 6. Cooling water source; 7. Guide slope; 8. Temperature sensor; 10. Cooling water jet pipe for the preform at the first position; 20. Cooling water jet pipe for the preform at the second position; 30. Cooling water jet pipe for the preform at the third position. Detailed Implementation

[0022] The present invention will be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if terms such as "upper", "lower", "front", "rear", "left", "right" indicate orientation or positional relationship, they are only corresponding to the drawings of this application for the purpose of describing the present invention. It should be understood that if terms such as "end", "side", "end portion", "side part", "lateral", "longitudinal", etc. indicate orientation or positional relationship, they are only corresponding to the length and width of the corresponding component. That is, "end" indicates the head and tail area in the length direction of the corresponding component, and "side part" indicates the head and tail area in the width direction of the corresponding component. The present invention is disclosed for the purpose of describing the present invention and does not indicate or imply that the device or element referred to must have a specific orientation.

[0023] Comparative Example 1 simulates the most common cooling method in the prior art. After the matured polyolefin raw material resin is melted at high temperature using an extruder, a cylindrical preform with a thickness of 200 μm and a temperature of 170 °C is extruded from top to bottom. The preform is then inserted vertically into a cooling water tank at a temperature of 2 °C, and cooling water is injected into the preform so that the inner liquid level is 20 mm higher than the outer liquid level.

[0024] In this comparative example, active circulation cooling is not used with heat exchange tubes; the internal water temperature is reduced solely by natural heat exchange between the membrane preform and the external water tank.

[0025] Under these conditions, to maintain basic product quality (non-conforming area ratio <3%), the extrusion speed V1 can only reach a maximum of about 3.5 m / min. If the speed is increased to 4.2 m / min, the temperature of the cooling water inside the preform will rise rapidly due to heat accumulation, and local boiling will occur, making it impossible for the product to meet quality requirements.

[0026] Comparative Example 2 uses the same process parameters as Example 1, but the extruder used does not have a guide slope at the discharge port of the lower cylindrical section 2, that is, the inner and outer edges of the discharge port are flush.

[0027] After 12 hours of continuous production, black spots began to adhere to the surface of the preform. As production continued for 15 hours, the number of black spots gradually increased, slightly disturbing the morphology of the extruded preform and causing longitudinal fine lines to appear on the surface. This indicates that in long-term continuous production, the lack of a guide bevel can introduce unstable quality risks.

[0028] Comparative Example 3 is used to verify the synergistic effect of three-stage external cooling. In this comparative example, the temperature of the cooling water inside the preform is precisely controlled at 10°C using heat exchange tubes, the extrusion speed V1 is 5.0 m / min, and the external cooling water injection at the first and second positions is enabled, but the external cooling water injection at the third position is not enabled.

[0029] After producing 1500 meters of preform, the area of ​​defective regions was found to be 1.0%. Analysis revealed that these defective areas were primarily due to residual heat remaining in the core of the preform after it left the second cooling zone, causing localized micro-wrinkles during subsequent shaping. This indicates that while the first two stages of cooling and internal preform cooling achieve good results, the lack of a third-stage jet cooling system is not the optimal solution for producing high-quality, stable thick films.

[0030] Example 1: A high-speed thick film extrusion cooling molding process based on internal and external synergistic cooling. To achieve the circulating cooling of the preform's internal cooling step using heat exchange tubes in a water circulation system, this invention provides a preferred extruder head structure modification scheme. The specific modification is as follows: Please refer to the instruction manual appendix. Figure 1-2 The extrusion head has an extrusion channel inside, which includes an upper conical section 1 and a lower cylindrical section 2 that are connected to each other.

[0031] The extruder head has an inlet pipe 3 and an outlet pipe 4 at the upper end of the lower cylindrical section 2, which are sealed and penetrate the side wall. The inner ends of the inlet pipe 3 and the outlet pipe 4 are connected to a heat exchange tube 5 placed inside the membrane preform, and the outer ends are connected to a cooling water source 6. Preferably, the heat exchange tube 5 is a spiral copper tube.

[0032] Specifically, an opening is provided at the position below the conical section 1 of the extruder head, which penetrates the extruder head and communicates with the cavity inside the extruder head. An inlet pipe 3 is sealed on one side of the cavity inside the extruder head, and an outlet pipe 4 is sealed on the other side. Then, a heat exchange pipe 5 is installed between the inlet pipe 3 and the outlet pipe 4. The outer ends of the inlet pipe 3 and the outlet pipe 4 are connected to a cooling water source 6 through a hose.

[0033] More specifically, cooling water source 6 has a circulating water pump and a control unit.

[0034] To ensure heat insulation, the inlet pipe 3 and outlet pipe 4 are covered with polytetrafluoroethylene insulation layers at least at the positions corresponding to the extrusion channels to reduce heat exchange between the molten resin and the cooling water pipe.

[0035] The discharge port of the lower cylindrical section 2 is designed such that the outer edge is lower than the inner edge, and the inner edge is machined with a 30~60° guide slope. This structure can effectively guide any possible material accumulation downward to the lower edge of the guide slope, thereby moving away from the preform and avoiding material accumulation on the preform that could lead to product defects.

[0036] Furthermore, it also includes a temperature sensor 8 for real-time detection of the cooling water temperature inside the membrane preform.

[0037] Temperature sensor 8 is connected to the control unit of cooling water source 6. The circulating water pump of cooling water source 6 dynamically adjusts the flow rate of cooling water input to heat exchange tube 5 based on the temperature information fed back by temperature sensor 8, so as to achieve precise closed-loop control of temperature.

[0038] Specifically, the temperature sensor 8 can be installed at the inlet or outlet of the heat exchange tube 5, and its connecting wire passes through the inlet pipe 3 or the outlet pipe 4 to connect to the control unit of the cooling water source 6. The temperature sensor 8 can also be installed in the same way as the heat exchange tube 5, that is, an opening is made at the position below the conical section 1 of the extruder, communicating with the cavity inside the extruder head. A pipe fitting is installed in the sealed opening, and the connecting wire of the temperature sensor 8 passes through the pipe fitting to connect to the control unit of the cooling water source 6.

[0039] The cooling process includes the following steps: Extruded preform: After the matured raw material resin is melted at high temperature in an extruder, a cylindrical film with a temperature of 160℃ to 190℃ and a thickness of not less than 190μm is extruded from top to bottom through the extruder head.

[0040] As a typical embodiment of the present invention, the thickness of the cylindrical preform is about 200 μm. For example, when the thickness of the finished film is 80 μm, the thickness of the extruded preform is 200 ± 5 μm.

[0041] Furthermore, the extrusion speed V1 of the preform is between 4 m / min and 6 m / min.

[0042] In this embodiment, the matured polyolefin raw material resin is melted at high temperature using a single screw extruder, and then extruded from top to bottom from the extruder head to form a cylindrical preform with a temperature of about 170°C, a thickness of 200 μm, and an extrusion speed V1 of 5.0 m / min.

[0043] External cooling of the membrane preform: The extruded membrane preform is inserted directly downwards into cooling water with a temperature of 0°C to 4°C. Cooling water of different temperatures is sprayed onto the outer surface of the membrane preform at three positions below the surface of the external cooling water: the first position is 20mm to 30mm below the surface of the liquid, and the sprayed water has a temperature of 0°C to 1°C; the second position is 45mm to 50mm below the surface of the liquid, and the sprayed water has a temperature of 3.5°C to 4.5°C; the third position is 60mm to 70mm below the surface of the liquid, and the sprayed water has a temperature of 5°C to 8°C. Please refer to the instruction manual appendix. Figure 3 The external cooling water jet is sprayed from all sides onto the outer surface of the membrane preform. Specifically, at the first position, the membrane preform is approximately circular, and the external cooling water jet pipe 10 at this position is a circular pipe coaxially fitted around the membrane preform, with multiple spray holes evenly distributed on the inner side of the pipe. At the second position, the membrane preform is approximately elliptical, and the external cooling water jet pipe 20 at this position is an elliptical pipe coaxially fitted around the membrane preform, with multiple spray holes evenly distributed on the inner side of the pipe. At the third position, the membrane preform is approximately oblong, and the external cooling water jet pipe 30 at this position is an oblong or rectangular pipe coaxially fitted around the membrane preform, with multiple spray holes evenly distributed on the inner side of the pipe.

[0044] Furthermore, the extrusion speed V1 of the preform satisfies a first proportional relationship with the cooling water jet speed V2 at the first position: R1=V1 / V2, a second proportional relationship with the cooling water jet speed V3 at the second position: R2=V1 / V3, and a third proportional relationship with the cooling water jet speed V4 at the third position: R3=V1 / V4. Where R1 is a constant between 8.0 and 10.0, R is a constant between 6.5 and 8.5, R3 is a constant between 5.5 and 7.5, V1 is in m / min, and V2, V3 and V4 are in m / s.

[0045] In this embodiment, the extruded membrane preform is inserted directly downwards into cooling water maintained at a temperature of 2°C, and cooling water of different temperatures is sprayed onto the outer surface of the membrane preform at a first position, a second position, and a third position below the surface of the cooling water outside the membrane preform.

[0046] At the first position 25mm below the liquid surface, cooling water at a temperature of 0.5℃ is sprayed onto the membrane preform, and the spraying speed V2 is 0.556m / s (R1=V1 / V2=5.0 / 0.556≈9.0). At a second position 48 mm below the liquid surface, cooling water at a temperature of 4.0℃ is sprayed onto the membrane preform at a spraying velocity V3 of 0.667 m / s (R2=V1 / V3=5.0 / 0.667≈7.5). At a third position 65 mm below the liquid surface, cooling water at a temperature of 6.0℃ is sprayed onto the membrane preform at a spraying speed V4 of 0.769 m / s (R3=V1 / V4=5.0 / 0.769≈6.5).

[0047] Internal cooling of the membrane preform: Cooling water is poured into the membrane preform from the open end, so that the liquid level of the internal cooling water is 10mm to 30mm higher than that of the external cooling water. The internal cooling water is circulated and cooled by heat exchange tubes in the water circulation system, and the temperature of the internal cooling water is controlled between 8℃ and 12℃.

[0048] Furthermore, the extrusion speed V1 of the membrane preform and the flow rate Q of the cooling water flowing through the heat exchange tube satisfy the fourth proportional relationship: R4=V1 / Q, where R4 is a constant between 5 and 7; and the unit of Q is L / s.

[0049] In this embodiment, cooling water is injected into the membrane preform from its open end, so that the cooling water level inside the preform is 20 mm higher than the external water level. The cooling water inside the preform is forcibly circulated and cooled using heat exchange tubes in the water circulation system to control its temperature to remain stable at 10°C. The cooling water flow rate Q through the heat exchange tubes is 0.83 L / s (R4 = V1 / Q ≈ 6.0).

[0050] 1500 meters of membrane preform were produced continuously. Testing showed that the membrane preform cooled uniformly inside and out, had a smooth and flat surface, a defective area rate of 0%, and no material accumulation or adhesion was observed.

[0051] Example 2 primarily verifies the proportional relationship R4 between the preform extrusion speed V1 and the internal cooling flow rate Q. This example produced 1500 meters of preform, yielding the experimental data shown in the table below.

[0052] Table 1. Experimental data on the effect of the intrapreform cooling flow rate ratio R4 on thick film quality. 4.5 0.75 6.0 9.2 no 0 5.0 0.83 6.0 10.0 no 0 5.5 0.92 6.0 10.7 no 0.1 5.5 1.00 5.5 10.1 no 0 6.0 1.00 6.0 11.8 critical 1.5 6.0 1.20 5.5 10.5 no 0.1 As shown in the test data above, controlling R4 between 5 and 7 can ensure that the temperature of the cooling water inside the preform is effectively controlled within the target range of 8-12℃ at different extrusion speeds. This fundamentally avoids the risk of boiling of the cooling water inside the preform, as seen in Comparative Example 1, thereby maintaining the area ratio of unqualified areas at an extremely low level (≤0.2%) and ensuring the stability and high quality of thick film production at speeds of 4-6 m / min.

[0053] The parts of this invention not described in detail are prior art. It will be apparent to those skilled in the art that this invention is not limited to the details of the above exemplary embodiments, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the above embodiments should be regarded as exemplary and non-limiting in all respects. The scope of this invention is defined by the appended claims rather than the foregoing description. Therefore, it is intended to include all changes that fall within the meaning and scope of the equivalents of the claims within this invention, and no reference numerals in the claims should be regarded as limiting the content of the claims.

Claims

1. A high-speed thick film extrusion cooling molding process based on internal and external synergistic cooling, characterized in that: Includes the following steps: Extruded preform: After the cured raw material resin is melted at high temperature in an extruder, a cylindrical preform with a temperature of 160℃ to 190℃ and a thickness of not less than 190μm is extruded from top to bottom through the extruder head; the extrusion speed V1 of the preform is between 4m / min and 6m / min. External cooling of the membrane preform: The extruded membrane preform is inserted directly downwards into cooling water with a temperature of 0°C to 4°C, and cooling water of different temperatures is sprayed onto the outer surface of the membrane preform at three positions below the surface of the external cooling water: the first position is 20mm to 30mm below the surface of the liquid, and the sprayed cooling water has a temperature of 0°C to 1°C; the second position is 45mm to 50mm below the surface of the liquid, and the sprayed cooling water has a temperature of 3.5°C to 4.5°C; the third position is 60mm to 70mm below the surface of the liquid, and the sprayed cooling water has a temperature of 5°C to 8°C. Internal cooling of the membrane preform: Cooling water is injected into the membrane preform from the open end, so that the liquid level of the internal cooling water is 10 mm to 30 mm higher than the liquid level of the external cooling water. The internal cooling water is circulated and cooled by heat exchange tubes in the water circulation system, and the temperature of the internal cooling water is controlled to be greater than or equal to 8°C and less than 11.8°C. The extrusion speed V1 of the membrane preform and the flow rate Q of the cooling water flowing through the heat exchange tube satisfy the fourth proportional relationship: R4=V1 / Q; Where R4 is a constant between 5 and 6; Q is in units of L / s.

2. The thick film high-speed extrusion cooling molding process based on internal and external synergistic cooling as described in claim 1, characterized in that: The extrusion speed V1 of the preform and the cooling water jet speed V2 at the first position satisfy the first proportional relationship: R1=V1 / V2; Where R1 is a constant between 8.0 and 10.0, V1 is in m / min, and V2 is in m / s.

3. The thick film high-speed extrusion cooling molding process based on internal and external synergistic cooling as described in claim 2, characterized in that: The extrusion speed V1 of the preform and the cooling water jet speed V3 at the second position satisfy the second proportional relationship: R2=V1 / V3; Where R2 is a constant between 6.5 and 8.5, V1 is in m / min, and V3 is in m / s.

4. The thick film high-speed extrusion cooling molding process based on internal and external synergistic cooling as described in claim 3, characterized in that: The extrusion speed V1 of the preform and the cooling water jet speed V4 at the third position satisfy the third proportional relationship: R3=V1 / V4; Where R3 is a constant between 5.5 and 7.5; V4 is in m / s.

5. A high-speed thick film extrusion cooling molding process based on internal and external synergistic cooling according to any one of claims 1-4, characterized in that: The extrusion head has an extrusion channel inside, which includes an upper conical section (1) and a lower cylindrical section (2) that are connected to each other. The extrusion head is provided with an inlet pipe (3) and an outlet pipe (4) on the side wall corresponding to the upper end of the lower cylindrical section (2). The inner ends of the inlet pipe (3) and outlet pipe (4) are connected to heat exchange pipes (5) located inside the membrane embryo, and the outer ends are connected to cooling water source (6).

6. The thick film high-speed extrusion cooling molding process based on internal and external synergistic cooling as described in claim 5, characterized in that: The inlet pipe (3) and outlet pipe (4) are provided with insulation layers in at least the sections corresponding to the extrusion channel.

7. The thick film high-speed extrusion cooling molding process based on internal and external synergistic cooling as described in claim 5, characterized in that: The inner edge of the discharge port of the lower cylindrical section (2) is higher than the outer edge; the inner edge is provided with a guide slope (7) to guide the accumulated material away from the discharge port.

8. The thick film high-speed extrusion cooling molding process based on internal and external synergistic cooling as described in claim 5, characterized in that: It also includes a temperature sensor (8) for detecting the temperature of the cooling water inside the membrane preform; The temperature sensor (8) is communicatively connected to the cooling water source (6); The cooling water source (6) is configured to adjust the cooling water flow rate input to the heat exchange tube (5) based on the temperature information detected by the temperature sensor (8).

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