A film blowing machine for film production
By designing inclined air outlets and slanted flared cooling air rings in the blown film machine, the problem of poor cooling effect in traditional blown film machines has been solved, achieving more efficient film bubble cooling and stable molding, and improving film quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGGUAN ZHENZHI METAL & PLASTIC PROD CO LTD
- Filing Date
- 2025-07-04
- Publication Date
- 2026-06-23
AI Technical Summary
The cooling air ring of a traditional blown film machine has poor cooling effect on the film bubble, with insufficient cooling area and height, resulting in uneven cooling of the film bubble and affecting film quality.
A cooling air ring is designed with the central axis of the air outlet set at an angle, so that the airflow forms an angle when it comes into contact with the membrane bubble, which prolongs the contact time and area. The obliquely flared air outlet improves the airflow coverage and uniformity, enhances the cooling effect, and provides a lifting force to stabilize the membrane bubble morphology.
It improves the cooling effect and stability of the membrane bubble, ensures the quality of film forming, reduces offset and wobbling, and enhances the overall quality of the film.
Smart Images
Figure CN224391901U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of blown film machine technology, and in particular to a blown film machine for thin film production. Background Technology
[0002] A plastic blown film machine is a device that heats and melts plastic particles and then blows them into a thin film. There are many types of blown film machines, including those for PE, POF, etc. The films produced by blown film machines are widely used in many fields depending on their materials and properties, and are suitable for various high-end film packaging, plastic bag films, protective films, etc. The working principle is as follows: dry polyethylene particles are added to the hopper, and the particles enter the screw from the hopper by their own weight. When the particles come into contact with the inclined screw, the rotating inclined screw generates a thrust perpendicular to the inclined screw surface, pushing the plastic particles forward. During the pushing process, due to the friction between the plastic and the screw, the plastic and the barrel, and the collision and friction between the particles, as well as the external heating of the barrel, the plastic particles gradually melt.
[0003] Molten plastic is filtered to remove impurities at the die head and then blown through the die to form a film bubble. The film bubble is manually pulled upwards, cooled by an air ring, pressed into a thin film by a herringbone plate and flattening rollers, and then wound into a cylinder by traction rollers and take-up rollers. However, in traditional cooling air rings, the contact time between the cooling airflow and the film bubble is short, resulting in a low cooling area and height, leading to poor cooling effect.
[0004] Therefore, it is necessary to propose a new technical solution to address the above problems. Utility Model Content
[0005] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the aforementioned problems.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a blown film machine for film production, comprising a blown film mechanism, a flattening mechanism, a winding mechanism, and a cooling mechanism;
[0007] The blown film mechanism includes a material cylinder, on which a hopper and a die head are provided;
[0008] The flattening mechanism includes a frame, on which a herringbone plate and a flattening roller assembly located at the upper end of the herringbone plate are mounted;
[0009] The winding mechanism includes a machine table, on which a winding roller assembly is provided;
[0010] The cooling mechanism includes an air supply source and a cooling air ring disposed at the upper end of the mold head. The air supply source and the cooling air ring are connected by a pipe. The inner ring wall of the cooling air ring has multiple air outlets, and the central axis of each air outlet is inclined upward relative to the horizontal plane.
[0011] As a further embodiment of this utility model: the horizontal plane of the air outlet is inclined and expanded outward on both sides, so that the cross-section of the air outlet is rectangular and flared.
[0012] As a further embodiment of this utility model: several conveying air pipes are connected to the air supply source, and several connection ports are provided on the outer ring wall of the cooling air ring, and the conveying air pipes are connected to the connection ports.
[0013] As a further embodiment of this utility model: a plurality of support rods are provided at the lower end of the cooling air ring, and the lower end of the support rods is connected to the material cylinder.
[0014] As a further embodiment of this utility model: the frame is provided with an operating platform, and the operating platform has openings corresponding to the die head and the cooling air ring;
[0015] The frame is also equipped with side fixing plates located on both sides of the flattening roller group. The flattening roller group consists of iron rollers and rubber rollers. Rhomboid seats are provided on both sides of the rubber rollers. Movable openings are provided on the side fixing plates, and the rhomboid seats are slidably connected to the movable openings. A push cylinder is also installed on the side fixing plates. The telescopic end of the push cylinder is connected to the rhomboid seat. By pushing the cylinder, the rhomboid seat and the rubber roller can be moved horizontally away from and closer to the iron roller.
[0016] A guide roller located at the upper end of the rubber roller is also provided between the two side fixing plates.
[0017] Compared with the existing technology, the beneficial effects of this technical solution are as follows: after the film bubble coming out of the die head passes through the upper cooling air ring, it is guided by the herringbone plate and gradually flattens out. Then, after passing through the flattening roller group, it forms the required film. Finally, the film is rolled up by the winding roller group on the machine for storage and use.
[0018] As the membrane bubble passes through the cooling air ring, the air supply generates airflow, which is then transported through pipes to the annular cavity of the cooling air ring and blown out through the air outlet. The central axis of the air outlet is inclined upward relative to the horizontal plane, so that the airflow blown out of the air outlet forms an angle when it comes into contact with the membrane bubble. After contacting the membrane bubble, the airflow continues to flow upward along the upward trajectory of the membrane bubble, thereby increasing the contact time and contact area between the airflow and the membrane bubble, increasing the cooling area and cooling height, enhancing the cooling effect on the membrane bubble, and ensuring that the membrane bubble is cooled and formed.
[0019] Furthermore, the airflow from the outlet contacts the membrane bubble at an upward angle, which can also generate an upward lifting force on the membrane bubble, counteracting the sag of the membrane bubble due to its own weight, making the membrane bubble more stable during the cooling and forming process, reducing the offset and swaying during the rise, stabilizing the shape of the membrane bubble, and improving the quality of the membrane bubble.
[0020] The air outlet is inclined and expanded outward on both sides of the horizontal plane, so that the cross-section of the air outlet is rectangular and flared. This allows the airflow to diffuse laterally after being blown out of the air outlet, so as to cover a wider membrane bubble surface and improve the uniformity of the airflow, so as to cool the membrane bubble surface evenly.
[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0024] Figure 2 This is a schematic diagram of the flattening mechanism of this utility model;
[0025] Figure 3 This is a schematic diagram of the cooling air ring structure of this utility model;
[0026] Figure 4 This is a top view of the cross-sectional structure of the cooling air ring of this utility model;
[0027] Figure 5 This is a side view of the cross-sectional structure of the cooling air ring of this utility model;
[0028] The corresponding labels in the attached diagram are explained as follows:
[0029] 1. Film blowing mechanism; 11. Material cylinder; 12. Hopper; 13. Die head; 2. Flattening mechanism; 21. Frame; 22. Herringbone plate; 23. Flattening roller assembly; 231. Iron roller; 232. Rubber roller; 233. Diamond-shaped seat; 24. Operating platform; 25. Side fixing plate; 26. Push cylinder; 27. Guide roller; 3. Winding mechanism; 31. Machine base; 32. Winding roller assembly; 4. Cooling mechanism; 41. Air supply source; 42. Cooling air ring; 43. Air outlet; 44. Conveying air duct; 45. Support rod; 46. Connection port. Detailed Implementation
[0030] 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.
[0031] Please see Figure 1-5 A blown film machine for film production includes a blown film mechanism 1, a flattening mechanism 2, a winding mechanism 3, and a cooling mechanism 4;
[0032] The blown film mechanism 1 includes a material cylinder 11, a hopper 12 and a die head 13. Dry plastic granules are fed into the material cylinder 11 through the hopper 12. Inside the material cylinder, there is a spiral rod with threaded oblique edges, and a drive motor is installed outside the material cylinder 11. The main shaft of the spiral rod passes through the material cylinder 11 and is connected to the output shaft of the drive motor. When the plastic granules come into contact with the threaded oblique edges, the rotating oblique edges drive them forward. At the same time, a heating tube is installed in the cylinder wall of the material cylinder 11 to raise the internal temperature of the material cylinder 11, thereby gradually melting the plastic granules. Then, the plastic granules are blown out through the die head 13 to form a film bubble.
[0033] The flattening mechanism 2 includes a frame 21, on which a herringbone plate 22 and a flattening roller group 23 located at the upper end of the herringbone plate 22 are arranged;
[0034] The winding mechanism 3 includes a machine table 31, on which a winding roller group 32 is provided;
[0035] The cooling mechanism 4 includes an air supply source 41 and a cooling air ring 42 disposed on the upper end of the mold head 13. The air supply source 41 and the cooling air ring 42 are connected by a pipe. The inner ring wall of the cooling air ring 42 has multiple air outlets 43, and the central axis of each air outlet 43 is inclined upward relative to the horizontal plane. The cooling air ring 42 has an annular cavity, and the air outlets 43 are connected to the annular cavity.
[0036] Specifically, after the film bubble from the die head 13 passes through the upper cooling air ring 42, it is gradually flattened by the guidance of the herringbone plate 22, and then forms the required film after passing through the flattening roller group 23. Finally, the film is rolled up by the winding roller group 32 on the machine 31 for storage and use.
[0037] As the membrane bubble passes through the cooling air ring 42, the air supply 41 generates airflow, which is then transported through a pipe to the annular cavity of the cooling air ring 42 and blown out through the air outlet 43. The central axis of the air outlet 43 is inclined upward relative to the horizontal plane, so that the airflow blown out of the air outlet 43 forms an angle when it comes into contact with the membrane bubble. After contacting the membrane bubble, the airflow continues to flow upward along the upward trajectory of the membrane bubble, thereby increasing the contact time and contact area between the airflow and the membrane bubble, increasing the cooling area and cooling height, enhancing the cooling effect on the membrane bubble, and ensuring that the membrane bubble is cooled and formed.
[0038] Furthermore, the airflow blown out from the air outlet 43 contacts the membrane bubble at an upward angle, which can also generate an upward lifting force on the membrane bubble, counteract the sag of the membrane bubble due to its own weight, making the membrane bubble more stable during the cooling and forming process, reducing the deviation and swaying during the rise, stabilizing the shape of the membrane bubble, and improving the quality of the membrane bubble.
[0039] like Figure 4 As shown, based on the above embodiment, it is further proposed that the horizontal sides of the air outlet 43 be inclined and outwardly expanded, so that the cross-section of the air outlet 43 is rectangular and flared.
[0040] The airflow is blown out from the outlet 43 and diffuses laterally to cover a wider membrane bubble surface, while improving the uniformity of the airflow to cool the membrane bubble surface evenly.
[0041] Based on the above embodiments, it is further proposed that a plurality of conveying air pipes 44 are connected to the air supply source 41, and a plurality of connection ports 46 are provided on the outer ring wall of the cooling air ring 42, and the conveying air pipes 44 are connected to the connection ports 46.
[0042] Specifically, the air supply source 41 is a blower. A pipe connector is set at the air outlet of the blower. One end of the air supply pipe 44 is connected to the pipe connector, and the other end is connected to the connection port 46 on the cooling air ring 42. The air supply source 41 outputs airflow, which enters the annular cavity inside the cooling air ring 42 through the air supply pipe 44 and is then blown out through the air outlet 43.
[0043] Based on the above embodiments, it is further proposed that a plurality of support rods 45 are provided at the lower end of the cooling air ring 42, and the lower end of the support rods 45 is connected to the material cylinder 11 to form a stable support for the cooling air ring 42.
[0044] Based on the above embodiments, it is further proposed that an operating platform 24 is provided on the frame 21, and the operating platform 24 has openings corresponding to the die head 13 and the cooling air ring 42;
[0045] The frame 21 is also provided with side fixing plates 25 located on both sides of the flattening roller group 23. The flattening roller group 23 is composed of iron roller 231 and rubber roller 232. Rhomboid seats 233 are provided on both sides of the rubber roller 232. The side fixing plates 25 are provided with movable openings, and the rhomboid seats 233 are slidably connected to the movable openings. The side fixing plates 25 are also equipped with push cylinders 26. The extension end of the push cylinder 26 is connected to the rhomboid seats 233. By pushing the cylinder 26, the rhomboid seats 233 and the rubber roller 232 can be driven to move horizontally away from and closer to the iron roller 231.
[0046] A guide roller 27 located at the upper end of the rubber roller 232 is also provided between the two side fixing plates 25.
[0047] Specifically, the frame 21 should also be equipped with stairs for workers to ascend to the operating platform 24. The membrane bubble is gradually squeezed by the traction of the herringbone plate 22. After the membrane bubble passes between the iron roller 231 and the rubber roller 232, the diamond seat 233 is pushed by the telescopic end of the push cylinder 26, so that the rubber roller 232 approaches the iron roller 231, forming a squeezing of the membrane bubble, turning the membrane bubble into a thin film. Finally, the film is wrapped around the guide roller 27 above, forming a reverse angle, and then wound up by the winding roller group 32 in the winding mechanism 3.
[0048] The take-up roller assembly 32 consists of a take-up roller and a drive motor. The take-up roller is rotatably mounted in the machine base 31. The drive motor drives the electric take-up roller to rotate, thereby generating a pulling force on the film to complete the film winding.
[0049] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
Claims
1. A blown film machine for thin film production, characterized in that, It includes a blown film mechanism (1), a flattening mechanism (2), a winding mechanism (3), and a cooling mechanism (4); The blown film mechanism (1) includes a material cylinder (11), on which a hopper (12) and a die head (13) are provided; The flattening mechanism (2) includes a frame (21), on which a herringbone plate (22) and a flattening roller group (23) located at the upper end of the herringbone plate (22) are provided. The winding mechanism (3) includes a machine table (31) on which a winding roller group (32) is provided. The cooling mechanism (4) includes an air supply source (41) and a cooling air ring (42) disposed on the upper end of the mold head (13). The air supply source (41) and the cooling air ring (42) are connected by a pipe. The inner ring wall of the cooling air ring (42) is provided with multiple air outlets (43), and the central axis of each air outlet (43) is inclined upward relative to the horizontal plane.
2. The blown film machine for thin film production according to claim 1, characterized in that, The air outlet (43) is inclined and expanded on both sides of the horizontal plane, so that the cross-section of the air outlet (43) is rectangular and flared.
3. The blown film machine for thin film production according to claim 2, characterized in that, The air supply source (41) is connected to several conveying air pipes (44), and several connection ports (46) are provided on the outer ring wall of the cooling air ring (42). The conveying air pipes (44) are connected to the connection ports (46).
4. The blown film machine for thin film production according to claim 3, characterized in that, The lower end of the cooling air ring (42) is provided with several support rods (45), and the lower end of the support rods (45) is connected to the material cylinder (11).
5. The blown film machine for film production according to claim 4, characterized in that, An operating platform (24) is provided on the frame (21), and the operating platform (24) has openings corresponding to the die head (13) and the cooling air ring (42); The frame (21) is also provided with side fixing plates (25) located on both sides of the flattening roller group (23). The flattening roller group (23) is composed of an iron roller (231) and a rubber roller (232). The rubber roller (232) is provided with diamond-shaped seats (233) on both sides. The side fixing plate (25) is provided with a movable opening, and the diamond-shaped seat (233) is slidably connected to the movable opening. The side fixing plate (25) is also equipped with a push cylinder (26). The telescopic end of the push cylinder (26) is connected to the diamond-shaped seat (233). The push cylinder (26) can drive the diamond-shaped seat (233) and the rubber roller (232) to move horizontally away from and closer to the iron roller (231). A guide roller (27) located at the upper end of the rubber roller (232) is also provided between the two side fixing plates (25).