A cooling device for the production of biodegradable heat shrink film

Abstract

This invention discloses a cooling device for the production of biodegradable heat shrink film, relating to the field of heat shrink film production technology. Specifically, it includes a frame, with a liquid inlet ring mounted on one side and a drive motor mounted on the outer side of the liquid inlet ring. A liquid inlet pipe is mounted on the side of the liquid inlet ring. A fixing frame is mounted on the other side of the frame, with a return liquid housing mounted on the outer end of the fixing frame and a return liquid pipe mounted on the end of the return liquid housing. A cooling roller is rotatably mounted between the liquid inlet ring and the return liquid housing. In this invention, the inner side of the heat shrink film relies on the cooling roller for heat absorption and cooling, resulting in a large area of ​​the inner side of the heat shrink film adhering to the surface of the cooling roller, forming a stable shaping area. By changing the direction of the film guide roller, the film tension is adjusted, cooperating with the airflow parallel to the outer side of the heat shrink film, improving the cooling and shaping efficiency of the heat shrink film and effectively avoiding vibration during the cooling and shaping process.

Description

Technical Field

[0001] This invention relates to the field of heat shrink film production technology, and in particular to a cooling device for the production of biodegradable heat shrink film. Background Technology

[0002] Biodegradable heat shrink film is an environmentally friendly film material that can rapidly decompose and integrate with the natural environment under specific conditions. It is manufactured through a specific process, possesses heat-shrinking properties, and can be rapidly decomposed by microorganisms under certain conditions, ultimately becoming integrated with the natural environment. Compared to traditional plastic films, biodegradable heat shrink film offers superior environmental performance and sustainability.

[0003] The manufacturing process of biodegradable heat shrink film typically involves selecting biodegradable raw materials, such as plant starch and polylactic acid, mixing the selected raw materials with other additives, and then forming them into films through processes such as extrusion and blown film. After specific heat treatment, the film acquires shrinkage properties. During the extrusion molding process, biodegradable heat shrink film needs to be cooled and shaped to maintain its shape. However, in the current technology, air cooling is mainly used to cool the film surface. When cold air is blown, it can easily cause the incompletely shaped film to shake, resulting in unevenness on the film surface or inconsistent film thickness.

[0004] In view of this, the present invention provides a cooling device for the production of biodegradable heat shrink film to solve the technical problems existing in the prior art. Summary of the Invention

[0005] Based on the technical problems existing in the background art, the present invention proposes a cooling device for the production of biodegradable heat shrink film.

[0006] This invention discloses a cooling device for the production of biodegradable heat shrink film, comprising a frame, an inlet ring mounted on one side of the frame, a drive motor mounted on the outer side of the inlet ring, an inlet pipe mounted on the side of the inlet ring, a fixed frame mounted on the other side of the frame, a return liquid housing mounted on the outer end of the fixed frame, a return liquid pipe mounted on the end of the return liquid housing, a cooling roller rotatably mounted between the inlet ring and the return liquid housing, one end of the cooling roller being connected to the drive motor, a movable frame with an arc-shaped structure rotatably mounted inside the frame, and an electric telescopic rod for adjusting the distance between the movable frame and the cooling roller mounted on the inner wall of the frame, a film guide roller mounted at the bottom of the movable frame, obliquely distributed air collecting hoods mounted above the movable frame, a blower mounted on the top of the air collecting hoods, a circulating air hood mounted at the air inlet of the blower, and the bottom of the circulating air hood extending to the bottom of the movable frame.

[0007] Preferably, in this invention, the air collecting hood includes a shell with its opening facing downwards, and a circular cavity is provided at the bottom of the shell, with a strip-shaped air guide frame installed below the circular cavity.

[0008] Preferably, in this invention, the upper end of the air guide frame is provided with a trumpet-shaped air inlet, and the bottom of the air guide frame is provided with a rectangular air outlet. The inner walls on both sides of the air outlet are provided with staggered guide fins, which are wedge-shaped.

[0009] Preferably, in this invention, a cold flow chamber is further provided in the middle of the air guide frame, one end of the cold flow chamber is connected to the liquid inlet ring by a cold flow inlet pipe, and the other end of the cold flow chamber is connected to the liquid return shell by a cold flow return pipe.

[0010] Preferably, in this invention, a fan-shaped cavity is provided on one side of the outer wall of the exhaust end, and an arc-shaped rack is provided at one end of the fan-shaped cavity. A stepper motor is installed on the outer side of the circular cavity, and a gear that meshes with the arc-shaped rack is installed at the end of the output shaft of the stepper motor.

[0011] Preferably, in this invention, a dispersing mechanism is installed above the air guide frame, and the dispersing mechanism includes two linkage rods rotatably installed inside the lower part of the air inlet end, and a multi-layer air guide plate distributed between the two linkage rods. The air guide plate is symmetrically distributed in a V-shape structure. A rectangular guide groove is provided at the upper end of the linkage rod, and a limiting bolt that slides with the rectangular guide groove is installed on the inner wall of the shell.

[0012] Preferably, in this invention, the circulating hood includes a return hood connected to the air inlet of the blower and a suction hood located above the membrane guide roller, and a ventilation hose is installed between the return hood and the suction hood. The bottom of the suction hood is provided with an arc-shaped guide plate that fits the outer surface of the heat shrink film.

[0013] Preferably, in this invention, the bottom of the arc-shaped drainage plate is fixedly connected to a positioning ring that rotates with the movable frame, the membrane guide roller is located at the center of the positioning ring, and a fine-tuning electric push rod is hinged between the side of the suction hood and the movable frame.

[0014] Preferably, in this invention, the cooling roller includes an outer roller body and an inner cylinder body connected to each other, and one end of the outer roller body is provided with a liquid inlet channel, and the outer surface of the inner cylinder body is provided with multiple rows of overflow holes with a frustum-shaped structure.

[0015] Preferably, in this invention, a flow-dispersing component is installed inside the overflow hole, and the flow-dispersing component includes a conical bracket installed on the outer side of the overflow hole and a fixed bracket installed on the inner side of the overflow hole. A guide shaft that passes through the overflow hole is slidably installed between the fixed bracket and the conical bracket, and a flow-dispersing plug that cooperates with the inner side of the overflow hole is installed on the outer side of the guide shaft.

[0016] Compared with the prior art, the present invention provides a cooling device for the production of biodegradable heat shrink film, which has the following beneficial effects:

[0017] In this invention, a cooling roller is provided, connected to a liquid inlet ring and a liquid return shell. Cooling water is connected to the cooling roller through the liquid inlet pipe and the liquid return pipe, respectively, to form a cooling water circulation inside the cooling roller. After extrusion, one end of the biodegradable heat shrink film is pressed against the outer surface of the cooling roller by a film guide roller for cooling and shaping. The movable frame is adjusted between the cooling roller and the cooling roller by an electric telescopic rod, thereby adjusting the area of ​​the biodegradable heat shrink film adhering to the outer surface of the cooling roller. Next, the cooling and shaping film is tightened between the cooling roller and the film guide roller. On the other side of the heat shrink film, air is blown downward by a blower, extending to the tail end. The circulating air hood below the frame draws in air again, and through the air collecting hood and the circulating air hood, an airflow parallel to the film surface is formed on the side of the heat shrink film, carrying away the heat from the outer side of the heat shrink film and preventing the flowing air from directly blowing on the film surface and causing film shaking. The inner side of the heat shrink film relies on the cooling roller to absorb heat and cool and shape it, and the inner side of the heat shrink film adheres to the surface of the cooling roller over a large area, forming a stable shaping area. By changing the direction of the film guide roller, the film tension is adjusted, which works in conjunction with the airflow parallel to the outer side of the heat shrink film to improve the cooling and shaping efficiency of the heat shrink film and effectively prevent shaking during the cooling and shaping process. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a cooling device for the production of biodegradable heat shrink film proposed in this invention;

[0019] Figure 2 This is a side view of a cooling device for producing biodegradable heat shrink film according to the present invention.

[0020] Figure 3 This is a schematic diagram of the internal structure of a cooling device for producing biodegradable heat shrink film according to the present invention.

[0021] Figure 4 This is a schematic diagram of the air collection hood and circulating air hood structure of a cooling equipment for the production of biodegradable heat shrink film proposed in this invention;

[0022] Figure 5 This is a cross-sectional view of the air collection hood of a cooling device for the production of biodegradable heat shrink film proposed in this invention;

[0023] Figure 6 This is a schematic diagram of the air guide frame structure of a cooling device for the production of biodegradable heat shrink film proposed in this invention;

[0024] Figure 7This is a schematic diagram of the circulating fan structure of a cooling device for the production of biodegradable heat shrink film proposed in this invention;

[0025] Figure 8 This is a schematic diagram of the cooling roller structure of a cooling device for producing biodegradable heat shrink film according to the present invention;

[0026] Figure 9 This is a schematic diagram of the distribution structure of the turbulence-dispersing components in a cooling device for the production of biodegradable heat-shrinkable film proposed in this invention;

[0027] Figure 10 This is a schematic diagram of the turbulence component structure of a cooling device for the production of biodegradable heat shrink film proposed in this invention.

[0028] In the diagram: 1. Frame, 2. Inlet pipe, 3. Drive motor, 4. Cooling roller, 41. Outer roller body, 42. Inner cylinder body, 43. Inlet channel, 44. Overflow hole, 45. Baffle, 451. Fixed bracket, 452. Conical bracket, 453. Baffle plug, 454. Guide shaft, 5. Inlet ring, 6. Movable frame, 7. Circulating fan hood, 71. Return hood, 72. Ventilation hose, 73. Suction hood, 74. Arc-shaped guide plate, 75. Positioning ring, 76. 8. Fine-tuning electric push rod, 8. Air collecting hood, 81. Dispersion mechanism, 811. Linkage rod, 812. Rectangular guide groove, 813. Air guide plate, 82. Stepper motor, 83. Air guide frame, 831. Air inlet, 832. Guide fins, 833. Air outlet, 834. Cold flow chamber, 84. Blower, 9. Electric telescopic rod, 10. Cold flow inlet pipe, 11. Membrane guide roller, 12. Fixing frame, 13. Return liquid pipe, 14. Return liquid housing, 15. Cold flow return pipe. Detailed Implementation

[0029] The embodiments of this patent are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this patent, and should not be construed as limiting this patent.

[0030] Reference Figure 1-10A cooling device for the production of biodegradable heat shrink film includes a frame 1. A liquid inlet ring 5 is mounted on one side of the frame 1, and a drive motor 3 is mounted on the outer side of the liquid inlet ring 5. A liquid inlet pipe 2 is mounted on the side of the liquid inlet ring 5. A fixing frame 12 is mounted on the other side of the frame 1, and a return liquid housing 14 is mounted on the outer end of the fixing frame 12. A return liquid pipe 13 is mounted on the end of the return liquid housing 14. A cooling roller 4 is rotatably mounted between the liquid inlet ring 5 and the return liquid housing 14, and one end of the cooling roller 4 is connected to... The drive motor 3 is connected to the transmission. The internal structure of the frame 1 is equipped with an arc-shaped movable frame 6. The inner wall of the frame 1 is also equipped with an electric telescopic rod 9 for adjusting the distance between the movable frame 6 and the cooling roller 4. The bottom end of the movable frame 6 is equipped with a film guide roller 11. The upper part of the movable frame 6 is equipped with obliquely distributed air collecting hoods 8. The top of the air collecting hoods 8 is equipped with a blower 84. The air inlet of the blower 84 is equipped with a circulating air hood 7. The bottom of the circulating air hood 7 extends to the bottom of the movable frame 6.

[0031] In this invention, a cooling roller 4 is provided, connected to a return housing 14 via an inlet ring 5. Cooling water is connected to the inlet pipe 2 and return pipe 13 respectively, forming a cooling water circulation inside the cooling roller 4. After extrusion, the biodegradable heat shrink film is pressed against the outer surface of the cooling roller 4 by the film guide roller 11 for cooling and shaping. The movable frame 6 is adjusted relative to the cooling roller 4 by an electric telescopic rod 9, thereby adjusting the area of ​​the biodegradable heat shrink film adhering to the outer surface of the cooling roller 4. Next, the cooling and shaping film is tightened between the cooling roller 4 and the film guide roller 11. On the other side of the heat shrink film, air is blown downwards by a blower 84, reaching the tail end. The heat is drawn again by the circulating air hood 7 extending below the movable frame 6. The airflow formed by the collecting air hood 8 and the circulating air hood 7 on the side of the heat shrink film is parallel to the film surface, which removes the heat from the outer side of the heat shrink film and avoids the film shaking caused by the flowing air blowing directly on the film surface. The inner side of the heat shrink film is cooled and shaped by the cooling roller 4, and the inner side of the heat shrink film adheres to the surface of the cooling roller 4 over a large area, forming a stable shaping area. The tension of the film is adjusted by changing the direction of the film guide roller 11. This, combined with the airflow that is parallel to the outer side of the heat shrink film, improves the cooling and shaping efficiency of the heat shrink film and effectively avoids shaking during the cooling and shaping process.

[0032] As a further embodiment of the present invention, the air collecting hood 8 includes a shell with its opening facing downwards, and a circular cavity is provided at the bottom of the shell. A strip-shaped air guide frame 83 is installed below the circular cavity. In the present invention, the air collecting hood 8 collects the flowing air generated by the blower 84. The circular cavity and the air guide frame 83 below guide the flowing air evenly, and an air curtain flush with the surface of the heat shrink film is formed by the air guide frame 83. The air flow quickly removes the temperature of the outer surface of the heat shrink film and reduces the impact of the air flow on the surface of the heat shrink film.

[0033] As a further embodiment of the present invention, the upper end of the air guide frame 83 is provided with a trumpet-shaped air inlet end 831, and the bottom of the air guide frame 83 is provided with a rectangular air outlet end 833. The inner walls on both sides of the air outlet end 833 are provided with staggered guide fins 832, which are wedge-shaped. In the present invention, the air is compressed at the air inlet end 831, and the air flow generated by the blower 84 is initially collected. The collected air is dispersed and discharged from the rectangular air outlet end 833 for initial air redistribution. The air flow is further guided and distributed by the guide fins 832 distributed on both sides of the inner walls of the air outlet end 833, ensuring that the air flow rate discharged from the air guide frame 83 is evenly distributed and flows in a curtain-like manner, further reducing the agitation effect of the flowing air on the membrane surface.

[0034] As a further embodiment of the present invention, a cold flow cavity 834 is also provided in the middle of the air guide frame 83. One end of the cold flow cavity 834 is connected to the liquid inlet ring 5 by a cold flow inlet pipe 10, and the other end of the cold flow cavity 834 is connected to the liquid return shell 14 by a cold flow return pipe 15. In the present invention, a cooling environment synchronized with the inside of the cooling roller 4 is constructed through the cold flow cavity 834. The air passing through is cooled by heat exchange through the guide fins 832, thereby constructing a cooling and shaping environment with a consistent temperature on the inner and outer surfaces of the heat shrink film, and accelerating the efficiency of cooling and shaping.

[0035] As a further embodiment of the present invention, a fan-shaped cavity is provided on one side of the outer wall of the exhaust end 833, and an arc-shaped rack is provided at one end of the fan-shaped cavity. A stepper motor 82 is installed on the outer side of the circular cavity, and a gear that meshes with the arc-shaped rack is installed at the output shaft end of the stepper motor 82. In the present invention, the upper end of the air guide frame 83 forms a rotational engagement relationship with the interior of the fan-shaped cavity. The lower end of the air guide frame 83 can be rotated and adjusted by the stepper motor 82. When the direction of the movable frame 6 is adjusted, the air outlet direction of the air guide frame 83 is adjusted accordingly.

[0036] As a further embodiment of the present invention, a dispersing mechanism 81 is installed above the air guide frame 83. The dispersing mechanism 81 includes two linkage rods 811 rotatably mounted inside the lower part of the air inlet end 831, and a multi-layer air guide plate 813 distributed between the two linkage rods 811. The air guide plate 813 is symmetrically distributed in a V-shape. A rectangular guide groove 812 is provided at the upper end of the linkage rod 811, and a limiting bolt that slides with the rectangular guide groove 812 is installed on the inner wall of the housing. In the present invention, the blower 84 blows out... The incoming air comes into contact with the dispersion mechanism 81 located inside the air collecting hood 8. Under the influence of the multi-layered V-shaped symmetrically distributed air guide plates 813, the incoming air is dispersed, and the central air force is distributed to various positions in the circular cavity. When the air outlet of the air guide frame 83 is adjusted, the upper end of the linkage rod 811 deflects to the opposite position, forming a misaligned fit with the opening of the air inlet 831, so that the compressed air enters the horn-shaped position of the air inlet 831 in two even streams, further ensuring that the ejected air is evenly distributed.

[0037] As a further embodiment of the present invention, the circulating hood 7 includes a return hood 71 connected to the air inlet of the blower 84 and a suction hood 73 located above the film guide roller 11. A ventilation hose 72 is installed between the return hood 71 and the suction hood 73. An arc-shaped guide plate 74 that fits the outer surface of the heat shrink film is provided at the bottom of the suction hood 73. In the present invention, the arc-shaped guide plate 74 is located above the film guide roller 11. When the film guide roller 11 guides the heat shrink film, the arc-shaped guide plate 74 at the upper side of the heat shrink film forms a suction negative pressure, which quickly draws in the air formed by the air collecting hood 8 and forms a circulating flow, avoiding the airflow from staying at the film guide roller 11 and affecting the shaping of the heat shrink film.

[0038] As a further embodiment of the present invention, the bottom of the arc-shaped guide plate 74 is fixedly connected to a positioning ring 75 that rotates with the movable frame 6. The membrane guide roller 11 is located at the center of the positioning ring 75, and a fine-tuning electric push rod 76 is hinged between the side of the suction hood 73 and the movable frame 6. In the present invention, when the air outlet direction of the air collecting hood 8 is adjusted according to the movement of the membrane guide roller 11, the fine-tuning electric push rod 76 extends and retracts with the movement of the membrane guide roller 11, always maintaining the distance between the arc-shaped guide plate 74 and the outer surface of the heat shrink film, preventing air from accumulating at the contact point between the membrane guide roller 11 and the heat shrink film to form fluctuations, and accelerating the air circulation speed on the outer surface of the heat shrink film, thereby improving the efficiency of the heat shrink film cooling and shaping.

[0039] As a further embodiment of the present invention, the cooling roller 4 includes an outer roller body 41 and an inner cylinder body 42 connected to each other. One end of the outer roller body 41 is provided with a liquid inlet channel 43, and the outer surface of the inner cylinder body 42 is provided with multiple rows of frustum-shaped overflow holes 44. In the present invention, cooling water flows from the liquid inlet channel 43 into the space between the outer roller body 41 and the inner cylinder body 42, and enters the interior of the inner cylinder body 42 through the overflow holes 44. It quickly absorbs the heat on the surface of the outer roller body 41, forming a flow channel with external cooling and internal heating, thereby enhancing the heat absorption and cooling effect of the outer surface of the cooling roller 4 and improving the efficiency of heat shrink film cooling and shaping.

[0040] As a further embodiment of the present invention, a baffle 45 is installed inside the overflow hole 44. The baffle 45 includes a conical bracket 452 installed on the outer side of the overflow hole 44 and a fixed bracket 451 installed on the inner side of the overflow hole 44. A guide shaft 454 passing through the overflow hole 44 is slidably installed between the fixed bracket 451 and the conical bracket 452. A baffle plug 453 that cooperates with the inner side of the overflow hole 44 is installed on the outer side of the guide shaft 454. In the present invention, when the cooling roller 4 is rotating, the baffle plug 453 located below blocks the overflow hole 44 located below under the action of gravity, reducing the flow rate of cooling water flowing from the overflow hole 44 below, thereby accelerating the flow rate of cooling water in the heat exchange area of ​​the cooling roller 4. The flow rate of cooling water between the outer roller body 41 and the inner cylinder body 42 is redistributed according to the heat exchange position of the heat shrink film, further improving the cooling effect of the cooling roller 4 and the heat shrink film bonding position.

[0041] During use, after extrusion, one end of the biodegradable heat shrink film is pressed against the outer surface of the cooling roller 4 by the film guide roller 11 for cooling and shaping. The area of ​​the biodegradable heat shrink film adhering to the outer surface of the cooling roller 4 is adjusted by the electric telescopic rod 9 between the movable frame 6 and the cooling roller 4. Next, the cooling and shaping film is tightened between the cooling roller 4 and the film guide roller 11. On the other side of the heat shrink film, air is blown downward by the blower 84, and flows through the circulating air hood 7 extending below the movable frame 6 at the tail end. The heat is drawn in again, and the airflow parallel to the film surface is formed by the air collecting hood 8 and the circulating air hood 7. This carries away the heat from the outer side of the heat shrink film and avoids the film shaking caused by the airflow blowing directly on the film surface. The inner side of the heat shrink film is cooled and shaped by the cooling roller 4, and the inner side of the heat shrink film adheres to the surface of the cooling roller 4 over a large area, forming a stable shaping area. The film tension is adjusted by changing the direction of the film guide roller 11, which works in conjunction with the airflow parallel to the outer side of the heat shrink film to improve the cooling and shaping efficiency of the heat shrink film.

[0042] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A cooling device for the production of biodegradable heat shrink film, comprising a frame (1), wherein a liquid inlet ring (5) is installed on one side of the frame (1), and a drive motor (3) is installed on the outer side of the liquid inlet ring (5), and a liquid inlet pipe (2) is installed on the side of the liquid inlet ring (5); a fixing frame (12) is installed on the other side of the frame (1), and a return liquid housing (14) is installed at the outer end of the fixing frame (12), and a return liquid pipe (13) is installed at the end of the return liquid housing (14), characterized in that, A cooling roller (4) is rotatably mounted between the liquid inlet ring (5) and the liquid return housing (14), and one end of the cooling roller (4) is connected to the drive motor (3). An arc-shaped movable frame (6) is rotatably mounted inside the frame (1), and an electric telescopic rod (9) for adjusting the distance between the movable frame (6) and the cooling roller (4) is also mounted on the inner wall of the frame (1). A membrane guide roller (11) is mounted at the bottom of the movable frame (6), and an obliquely distributed air collecting hood (8) is mounted above the movable frame (6). A blower (84) is mounted on the top of the air collecting hood (8). A circulating hood (7) is installed at the air inlet of 84), and the bottom of the circulating hood (7) extends to the bottom of the movable frame (6). The collecting hood (8) includes a shell with the opening facing downward, and a circular cavity is provided at the bottom of the shell. A strip-shaped air guide frame (83) is installed below the circular cavity. A trumpet-shaped air inlet end (831) is provided at the upper end of the air guide frame (83), and a rectangular exhaust end (833) is provided at the bottom of the air guide frame (83). The inner walls on both sides of the exhaust end (833) are provided with staggered guide fins (832), and the guide fins (832) are wedge-shaped.

2. The cooling equipment for producing biodegradable heat shrink film according to claim 1, characterized in that, The air guide frame (83) is also provided with a cold flow chamber (834) in the middle. One end of the cold flow chamber (834) is connected to the liquid inlet ring (5) with a cold flow inlet pipe (10), and the other end of the cold flow chamber (834) is connected to the liquid return shell (14) with a cold flow return pipe (15).

3. The cooling equipment for producing biodegradable heat shrink film according to claim 2, characterized in that, The exhaust end (833) has a fan-shaped cavity on one side of its outer wall, and an arc-shaped rack is provided at one end of the fan-shaped cavity. A stepper motor (82) is installed on the outside of the circular cavity, and a gear that meshes with the arc-shaped rack is installed at the output shaft end of the stepper motor (82).

4. The cooling equipment for producing biodegradable heat shrink film according to claim 3, characterized in that, A dispersing mechanism (81) is installed above the air guide frame (83), and the dispersing mechanism (81) includes two linkage rods (811) rotatably installed inside the lower part of the air inlet end (831), and a multi-layer air guide plate (813) distributed between the two linkage rods (811). The air guide plate (813) is symmetrically distributed in a V-shaped structure. A rectangular guide groove (812) is provided at the upper end of the linkage rod (811), and a limiting bolt that slides with the rectangular guide groove (812) is installed on the inner wall of the shell.

5. The cooling equipment for producing biodegradable heat shrink film according to claim 1, characterized in that, The circulating hood (7) includes a return hood (71) connected to the air inlet of the blower (84) and a suction hood (73) located above the membrane guide roller (11). A ventilation hose (72) is installed between the return hood (71) and the suction hood (73). An arc-shaped guide plate (74) that fits the outer surface of the heat shrink film is provided at the bottom of the suction hood (73).

6. The cooling equipment for producing biodegradable heat shrink film according to claim 5, characterized in that, The bottom of the arc-shaped diversion plate (74) is fixedly connected to a positioning ring (75) that rotates with the movable frame (6). The membrane guide roller (11) is located at the center of the positioning ring (75), and a fine-tuning electric push rod (76) is hinged between the side of the suction cover (73) and the movable frame (6).

7. The cooling equipment for producing biodegradable heat shrink film according to claim 1, characterized in that, The cooling roller (4) includes an outer roller body (41) and an inner cylinder body (42) connected to each other. One end of the outer roller body (41) is provided with a liquid inlet channel (43), and the outer surface of the inner cylinder body (42) is provided with multiple rows of frustum-shaped overflow holes (44).

8. The cooling equipment for producing biodegradable heat shrink film according to claim 7, characterized in that, The overflow hole (44) is equipped with a baffle (45), and the baffle (45) includes a tapered bracket (452) installed on the outer side of the overflow hole (44) and a fixed bracket (451) installed on the inner side of the overflow hole (44). A guide shaft (454) that passes through the overflow hole (44) is slidably installed between the fixed bracket (451) and the tapered bracket (452), and a baffle plug (453) that cooperates with the inner side of the overflow hole (44) is installed on the outer side of the guide shaft (454).

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