Secondary film blowing mechanism for PVC (polyvinyl chloride) heat shrinkage film production

Abstract

The utility model relates to the technical field of secondary film blowing, and discloses a secondary film blowing mechanism for PVC (polyvinyl chloride) thermal shrinkage film production, which comprises a machine body, a guide chamber is mounted at the top of the machine body, a film blowing device is fixedly connected to the bottom of the guide chamber, a notch is formed in the outer side of the machine body, and a distance adjusting component is mounted in the machine body. A guide assembly is installed on the outer side of the adjusting assembly, a cooling assembly is further installed in the middle of the guide assembly, a tension adjusting assembly is installed on the outer side of the machine body and comprises a rotating rod, and the rotating rod is rotationally connected to the outer side of the machine body. According to the utility model, through the matching design of the guide assembly and the fin type air cooler, external air is adopted for air cooling, so that the heat shrink film is ensured to be uniformly cooled in the cooling process, the shaping time is shortened, and the damage caused by non-uniform temperature in the rolling process of the film material is avoided; therefore, the overall quality and the production efficiency of the membrane material are improved.

Description

Technical Field

[0001] This utility model relates to the field of secondary blown film technology, and in particular to a secondary blown film mechanism for the production of PVC heat shrink film. Background Technology

[0002] In the production process of PVC heat shrink film, the secondary blown film process plays an important role in improving the quality of the film by further optimizing the forming and cooling process of the film.

[0003] Secondary blown film equipment typically relies on natural cooling or simple airflow cooling methods, which are insufficient to meet the need for rapid cooling of membrane materials at high temperatures. In such cases, the membrane material cools down slowly, easily leading to uneven temperature distribution on the membrane surface, which in turn causes problems such as uneven membrane thickness and surface wrinkles, severely affecting the transparency and heat shrinkage performance of the finished product.

[0004] Secondly, during the membrane winding process, as the membrane continues to wind, the radius of the winding roller will continuously increase, making it difficult for the winding speed and tension to keep pace with the radius change. The membrane is prone to wrinkles, indentations, or uneven tension due to uneven stress, and it can also cause core deformation. These problems will adversely affect the winding quality and subsequent performance of the membrane. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a secondary blown film mechanism for PVC heat shrink film production, which aims to improve the problems of uneven film cooling and poor winding quality caused by the lack of efficient cooling function and difficulty in adapting to radius changes in the existing secondary blown film device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A secondary blown film production mechanism for PVC heat shrink film includes a machine body, a guide chamber installed on the top of the machine body, a blown film device fixedly connected to the bottom of the guide chamber, a notch opened on the outer side of the machine body, a spacing adjustment component installed inside the machine body, a guide component installed on the outer side of the adjustment component, a cooling component installed in the middle of the guide component, and a tension adjustment component installed on the outer side of the machine body.

[0008] The tension adjustment assembly includes a rotating rod, which is rotatably connected to the outside of the machine body. A main rod is fixedly connected to the outside of the rotating rod. A secondary rod is installed at the bottom of the main rod. Two guide rollers are rotatably connected to the middle of the secondary rod. A rotating roller is rotatably connected to the middle of the main rod. A reciprocating drive assembly is installed on the outside of the machine body and is connected to the rotating rod.

[0009] As a further description of the above technical solution:

[0010] The spacing adjustment assembly includes a bidirectional threaded rod, which is rotatably connected inside the machine body. A motor is fixedly connected to the outside of the machine body, and the bidirectional threaded rod is fixedly connected to the output end of the motor.

[0011] As a further description of the above technical solution:

[0012] The guiding assembly includes two guide plates, both of which are slidably connected inside the machine body. Guide rollers are rotatably connected to opposite sides of the two guide plates, and both guide plates are threadedly connected to the outer periphery of the bidirectional threaded rod.

[0013] As a further description of the above technical solution:

[0014] The cooling assembly includes a finned air cooler, which is fixedly connected to the outside of the body. An air pump is fixedly connected to the top of the finned air cooler. A connecting hose is fixedly connected to the outside of the finned air cooler. An air inlet is fixedly connected to the other end of the connecting hose. The air inlet is fixedly connected to the middle of the guide plate.

[0015] As a further description of the above technical solution:

[0016] An air outlet is fixedly connected to the middle of the guide plate, the air outlet is located above the air inlet, and multiple dustproof nets are installed in the middle of the body;

[0017] As a further description of the above technical solution:

[0018] A positioning rod is fixedly connected inside the machine body, and both guide plates are slidably connected to the outer periphery of the positioning rod.

[0019] As a further description of the above technical solution:

[0020] The machine body is rotatably connected to a first steering roller and a second steering roller. After passing through the guide assembly, the heat shrink film passes around the outer periphery of the first and second steering rollers.

[0021] As a further description of the above technical solution:

[0022] The reciprocating drive assembly includes a second motor, which is fixedly connected to the outside of the machine body. Two half gears are fixedly connected to the output end of the second motor, and a bevel gear is fixedly connected to one end of the rotating rod. The bevel gear and the half gear mesh with each other.

[0023] This utility model has the following beneficial effects:

[0024] 1. In this utility model, by combining the guide component and the finned air cooler, external air is used for air cooling to ensure that the heat shrink film cools down evenly during the cooling process, shortening the setting time and avoiding damage to the film material due to uneven temperature during the winding process, thereby improving the overall quality of the film material and production efficiency.

[0025] 2. In this utility model, by adjusting the distance between the guide plates and using a tension adjustment component controlled by a drive motor, the film material is subjected to uniform force during the winding process, avoiding problems such as wrinkles, indentations, or uneven tension caused by uneven winding tension, thus ensuring the consistency and high quality of film material winding. Attached Figure Description

[0026] Figure 1 This is a three-dimensional schematic diagram of a secondary blown film mechanism for the production of PVC heat shrink film proposed in this utility model;

[0027] Figure 2 This is a cross-sectional structural diagram of the body of a secondary blown film mechanism for PVC heat shrink film production proposed in this utility model.

[0028] Figure 3 This is a schematic diagram of the tension adjustment component of a secondary blown film mechanism for PVC heat shrink film production proposed in this utility model;

[0029] Figure 4 This is a schematic diagram of the guiding component of a secondary blown film mechanism for PVC heat shrink film production proposed in this utility model.

[0030] Legend:

[0031] 1. Machine body; 2. Guide chamber; 3. Film blown device; 4. Guide plate; 5. Guide roller; 6. Bidirectional threaded rod; 7. Motor 1; 8. Air inlet; 9. Air outlet; 10. Finned air cooler; 11. Connecting hose; 12. Air pump; 13. Rotating rod; 14. Main rod; 15. Secondary rod; 16. Guide roller; 17. Rotating roller; 18. Motor 2; 19. Half gear; 20. Bevel gear; 21. Dustproof net; 22. Notch; 23. Directional roller 1; 24. Directional roller 2; 25. Positioning rod. Detailed Implementation

[0032] 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.

[0033] Reference Figures 1-2 This utility model provides an embodiment of a secondary blown film mechanism for PVC heat shrink film production, comprising a machine body 1. A guide chamber 2 is installed on the top of the machine body 1. The heat shrink film material to be blown into the machine body 2 enters from the top of the guide chamber 2. The guide chamber 2 contains two sets of relatively rotating rollers, which transport the film material by rotating. This is prior art and will not be described in detail here. A blown film device 3 is fixedly connected to the bottom of the guide chamber 2. The film material transported into the guide chamber 2 undergoes secondary blown film operation through the blown film device 3. The blown film device 3 is prior art and will not be described in detail here. A notch 22 is provided on the outer side of the machine body 1, through which the film material after secondary blown film production is discharged.

[0034] Reference Figure 2 and Figure 4 The machine body 1 is equipped with a spacing adjustment component, and a guide component is installed on the outside of the adjustment component. The position of the guide component is changed by adjusting the spacing, thereby adapting to the guiding operation of film materials of different thicknesses. The spacing adjustment component includes a bidirectional threaded rod 6, which is rotatably connected inside the machine body 1. A motor 7 is fixedly connected to the outside of the machine body 1, and the bidirectional threaded rod 6 is fixedly connected to the output end of the motor 7. The guide component includes two guide plates 4, both of which are threadedly connected to the outer periphery of the bidirectional threaded rod 6. By driving the motor 7, the bidirectional threaded rod 6 can be rotated, thus allowing the two guide plates 4 to move towards each other, thereby adjusting the spacing between the two guide plates 4 to adapt to the guiding operation of heat shrink film of different thicknesses. Both guide plates 4 are slidably connected inside the machine body 1, and a guide roller 5 is rotatably connected to the opposite side of the two guide plates 4. After the heat shrink film is blown by the blown film extruder 3, it descends to the space between the two guide plates 4 and contacts the guide roller 5. At this time, the film is guided by the guide roller 5 to change from a cylindrical shape to a flat shape to facilitate the subsequent winding operation.

[0035] Reference Figures 1-2A positioning rod 25 is fixedly connected inside the body 1. Two guide plates 4 are slidably connected to the outer periphery of the positioning rod 25. The positioning rod 25 guides and positions the guide plates 4, ensuring smooth movement of the guide plates 4. A cooling assembly is also installed in the middle of the guiding assembly. The cooling assembly includes a finned air cooler 10, which is fixedly connected to the outside of the body 1. The finned air cooler 10 is used to cool the incoming air and is existing technology, so it will not be described in detail here. A blower pump 12 is fixedly connected to the top of the finned air cooler 10, and a connecting hose 11 is fixedly connected to the outside of the finned air cooler 10. An air inlet 8 is fixedly connected to the other end of the connecting hose 11. The air inlet 8 is fixedly connected to the middle of the guide plate 4. External air is delivered to the inside of the finned air cooler 10 by the blower pump 12. After the air is cooled by the finned air cooler 10, it is delivered to the air inlet 8 through the two connecting hoses 11. The cooled air is blown out from the air inlet 8 to cool the surface of the heat shrink film, thereby increasing the cooling speed of the heat shrink film and avoiding damage to the film during the subsequent winding process. An air outlet 9 is fixedly connected to the middle of the guide plate 4. The air outlet 9 is located above the air inlet 8. The air blown out from the air inlet 8 is guided by the outside of the heat shrink film and then discharged from the air outlet 9. Multiple dust screens 21 are installed in the middle of the machine body 1. The air discharged from the air outlet 9 enters the interior of the machine body 1 and is then discharged from the dust screen 21 to the outside of the equipment. By keeping the air inside the machine body 1, the overall temperature inside the machine body 1 can be affected, so that the heat shrink film blown out from the blown film 3 can be cooled down quickly, thereby further improving the cooling efficiency.

[0036] Reference Figure 2 Inside the machine body 1, there are rotating connecting guide roller 1 23 and guide roller 24. After passing through the guide assembly, the heat shrink film passes around the outer periphery of guide roller 1 23 and guide roller 24. After being guided by the guide assembly, the heat shrink film moves downward and passes around the bottom of guide roller 1 23 and the top of guide roller 24 before being discharged from the notch 22 for winding operation.

[0037] Reference Figures 2-3A tension adjustment assembly is installed on the outer side of the machine body 1. Before winding, the tension of the heat shrink film is adjusted by the tension adjustment assembly. After cooperating with the subsequent winding assembly, the heat shrink film is wound, and it is ensured that the winding tightness will not be inconsistent due to the continuous change of the outer diameter of the winding roller during the winding process. The tension adjustment assembly includes a rotating rod 13, which is rotatably connected to the outer side of the machine body 1. A main rod 14 is fixedly connected to the outer side of the rotating rod 13. A secondary rod 15 is installed at the bottom of the main rod 14. Two guide rollers 16 are rotatably connected to the middle of the secondary rod 15. A rotating roller 17 is rotatably connected to the middle of the main rod 14. After the heat shrink film is discharged from the notch 22, it passes over the top of the rotating roller 17 and then passes between the two guide rollers 16 before connecting with the winding assembly. A reciprocating drive assembly is installed on the outside of the machine body 1. The reciprocating drive assembly is connected to the rotating rod 13. The reciprocating drive assembly includes a second motor 18, which is fixedly connected to the outside of the machine body 1. Two half gears 19 are fixedly connected to the output end of the second motor 18. A bevel gear 20 is fixedly connected to one end of the rotating rod 13. The bevel gear 20 and the half gears 19 mesh with each other. By driving the second motor 18, the two half gears 19 can be driven to rotate. Because the two half gears 19 are arranged opposite each other, when the second motor 18 is working, the two half gears 19 rotate. Gear 19 intermittently meshes with bevel gear 20, enabling bevel gear 20 to reciprocate. This causes rotating rod 13, main rod 14, and auxiliary rod 15 to oscillate back and forth, thus adjusting the tension of the heat shrink film. Auxiliary rod 15 slides in the middle of main rod 14, and an adjusting bolt is provided on the outside of main rod 14. The length of the extended auxiliary rod 15 can be adjusted by adjusting the bolt, thereby adjusting the oscillation amplitude. The spacing of guide rollers 16 can also be adjusted to accommodate secondary blowing operations of heat shrink films of different thicknesses.

[0038] Working principle: The heat shrink film that has undergone one blown film is put into the top of the guide chamber 2 and conveyed downward through the guide chamber 2. It then undergoes a second blown film process inside the blown film machine 3. After the second blown film process, the heat shrink film moves downward and reaches between the two guide plates 4. At this time, the film is guided by the guide rollers 5 on both sides and moves closer to the center. Then it is discharged from the bottom outlet of the two guide plates 4, passes around the bottom of the first guide roller 23 and the top of the second guide roller 24, and then passes through the notch 22. After passing around the top of the rotating roller 17, it passes through the middle of the two guide rollers 16 and then connects with the take-up roller outside the equipment. The take-up roller then winds up the heat shrink film after the second blown film process.

[0039] As the shrink film passes between the two guide plates 4, the drive motor 7 rotates the bidirectional threaded rod 6, thereby adjusting the distance between the two guide plates 4 to accommodate films of different thicknesses for guiding and compression. As the shrink film passes, the drive air pump 12 extracts external air, which then passes through the finned air cooler 10 and is transmitted to the air inlet 8 via two connecting hoses 11. This air-cools the heat-shrink film, causing the heated air to move upwards along the outer edge of the film and exit from the air outlet 9, then through the dust filter 21. This process completes the cooling of the heat-shrink film, reducing its setting time and preventing damage during winding.

[0040] When the heat shrink film is being wound up, the drive motor 18 operates to drive the two half gears 19 to rotate, which in turn causes the bevel gear 20 to drive the rotating rod 13 to rotate back and forth, causing the main rod 14 and the auxiliary rod 15 to swing. At this time, the heat shrink film passing between the two guide rollers 16 is subjected to the swinging action. After cooperating with the winding roller, it can ensure that the pressure on each position is similar when the heat shrink film is wound up, so as to reduce the quality reduction caused by pulling, loosening and tightening during the winding process, thus further improving the quality of the heat shrink film.

[0041] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A secondary blown film mechanism for producing PVC heat shrink film, comprising a body (1), characterized in that: The top of the machine body (1) is equipped with a guide chamber (2), and the bottom of the guide chamber (2) is fixedly connected with a blown film device (3). A notch (22) is opened on the outside of the machine body (1). A spacing adjustment component is installed inside the machine body (1). A guide component is installed on the outside of the adjustment component. A cooling component is also installed in the middle of the guide component. A tension adjustment component is installed on the outside of the machine body (1). The tension adjustment assembly includes a rotating rod (13), which is rotatably connected to the outside of the machine body (1). A main rod (14) is fixedly connected to the outside of the rotating rod (13). A secondary rod (15) is installed at the bottom of the main rod (14). Two guide rollers (16) are rotatably connected to the middle of the secondary rod (15). A rotating roller (17) is rotatably connected to the middle of the main rod (14). A reciprocating drive assembly is installed on the outside of the machine body (1), and the reciprocating drive assembly is connected to the rotating rod (13).

2. The secondary blown film mechanism for PVC heat shrink film production according to claim 1, characterized in that: The spacing adjustment assembly includes a bidirectional threaded rod (6), which is rotatably connected inside the body (1). A motor (7) is fixedly connected to the outside of the body (1), and the bidirectional threaded rod (6) is fixedly connected to the output end of the motor (7).

3. The secondary blown film mechanism for PVC heat shrink film production according to claim 2, characterized in that: The guiding assembly includes two guide plates (4), both of which are slidably connected inside the body (1). Guide rollers (5) are rotatably connected to the opposite side of the two guide plates (4), and both guide plates (4) are threadedly connected to the outer periphery of the bidirectional threaded rod (6).

4. The secondary blown film mechanism for PVC heat shrink film production according to claim 3, characterized in that: The cooling assembly includes a finned air cooler (10), which is fixedly connected to the outside of the body (1). An air pump (12) is fixedly connected to the top of the finned air cooler (10). A connecting hose (11) is fixedly connected to the outside of the finned air cooler (10). An air inlet (8) is fixedly connected to the other end of the connecting hose (11). The air inlet (8) is fixedly connected to the middle of the guide plate (4).

5. A secondary blown film mechanism for PVC heat shrink film production according to claim 4, characterized in that: An air outlet (9) is fixedly connected to the middle of the guide plate (4). The air outlet (9) is located above the air inlet (8). Multiple dustproof nets (21) are installed in the middle of the body (1).

6. A secondary blown film mechanism for PVC heat shrink film production according to claim 3, characterized in that: The body (1) is fixedly connected to a positioning rod (25), and the two guide plates (4) are slidably connected to the outer periphery of the positioning rod (25).

7. A secondary blown film mechanism for PVC heat shrink film production according to claim 1, characterized in that: The machine body (1) is rotatably connected to a first steering roller (23) and a second steering roller (24). The heat shrink film passes through the guide assembly and then wraps around the outer periphery of the first steering roller (23) and the second steering roller (24).

8. A secondary blown film mechanism for PVC heat shrink film production according to claim 1, characterized in that: The reciprocating drive assembly includes a second motor (18), which is fixedly connected to the outside of the body (1). The output end of the second motor (18) is fixedly connected to two half gears (19), and one end of the rotating rod (13) is fixedly connected to a bevel gear (20). The bevel gear (20) and the half gear (19) mesh with each other.

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