PE film blowing mold

Abstract

The utility model relates to a PE film blow mould technical field, and disclose a PE film blow mould, including film blow mould main part, the inside surface of film blow mould main part is provided with blow gas channel, the lower extreme outer surface of film blow mould main body is fixedly connected with film bottom die main part, the lower extreme of film blow mould main part is provided with blow gas mouth, the outer surface of blow gas mouth is provided with annular positioning convex platform, the outer surface of annular positioning convex platform is clamped in film bottom die main part, the outer surface of blow gas mouth is connected with locking nut through screw thread, the upper surface of film bottom die main part is fixedly connected with film outer die main part, be provided with blow mould cavity between film blow mould main part, film bottom die main part, film outer die main part, convenient to assemble and disassemble, blow mould cavity is convenient to clean, its maintenance is convenient, and the mechanism is simple and low in cost, and set up dispersed air hole at the upper end export of blow gas mouth, will not be inwards and contract and be bonded in the upper end of film blow mould main part.

Description

Technical Field

[0001] This utility model relates to the field of PE film blow molding mold technology, specifically a PE film blow molding mold. Background Technology

[0002] PE film, or polyethylene film, refers to film produced from PE granules. PE film has advantages such as moisture resistance and low moisture permeability, and is widely used in food packaging, agricultural production, electrical and electronic industries, and optical displays. Depending on the manufacturing method and control measures, polyethylene film can be produced into products with different properties, such as low-density, medium-density, high-density polyethylene, and cross-linked polyethylene. Blow molding is the most common forming method for plastic film production. In the blow molding process, single resin granules or a mixture of resin granules are added to a hopper, plasticized and melted in an extruder, and then fed into a mold. The material flows along the internal channels of the mold and is extruded into a ring-shaped preform from the die opening. The inflated preform is cooled by cooling air provided by internal and external cooling systems, and then pulled and wound by a rotating traction frame located above the die head to obtain the film product. Finally, the film is cut and processed to make packaging bags. Existing extrusion blow molding dies generally include an inner die head and an outer die head fitted onto the inner die head. The inner die head has flow channels. In the prior art, such as application publication number CN119974479A, this invention relates to the field of blow molding technology, specifically a PE film blow molding mold for making packaging bags, including an outer mold head, an inner mold core, a cleaning component, and a cleaning block. The inner mold core has a spiral flow channel, and the outer mold head is fixedly sleeved on the inner mold core. The inner wall of the outer mold head and the spiral flow channel form an extrusion channel. The cleaning component is sleeved on the inner mold core, and the cleaning block is made of rubber material and installed on the cleaning component. The outer surface shape of the cleaning block conforms to the spiral flow channel. This invention applies a thrust to the cleaning component using air pressure, causing the cleaning component to move vertically. The cleaning block discharges aggregates and carbon deposits from above the extrusion channel, avoiding the need to disassemble the inner mold core and outer mold head for cleaning, which is time-consuming and labor-intensive. In the existing technology, the film blow molding mold is an integral structure, which makes it inconvenient to clean the inner cavity and to disassemble and maintain it. According to the above patent, the built-in cleaning mechanism is complex and inconvenient to control. Moreover, when the film is blown out and expanded, there is no airflow at the outlet of the mold cavity, and the blown film is easy to stick to the inner wall of the mold. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a PE film blow molding mold that solves the problems of inconvenient cleaning of the inner mold cavity, inconvenient disassembly and maintenance, complex mechanism and high cost, and the lack of airflow at the mold cavity outlet when the film is blown out and expanded, thus solving the problem of the blown film easily sticking to the inner wall of the mold.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a PE film blow molding die, comprising a film blow molding body, an air blowing channel provided on the inner surface of the film blow molding body, a film bottom mold body fixedly connected to the lower outer surface of the film blow molding body, an air blowing port provided at the lower end of the film blow molding body, an annular positioning protrusion provided on the outer surface of the air blowing port, the film bottom mold body snapping onto the outer surface of the annular positioning protrusion, a locking nut threadedly connected to the outer surface of the air blowing port, a film outer mold body fixedly connected to the upper surface of the film bottom mold body, a blow molding cavity provided between the film blow molding body, the film bottom mold body, and the film outer mold body, and a dispersing air hole opened on the upper inner surface of the air blowing channel.

[0005] Preferably, a threaded mounting groove is provided on the lower outer surface of the film mold body, and an extrusion nozzle is installed in the threaded mounting groove of the film mold body by means of threads.

[0006] Preferably, one end of the extrusion nozzle is provided with an external thread, and the other end of the extrusion nozzle is provided with a hexagonal protrusion.

[0007] Preferably, the upper end of the air blowing channel is provided with an inner expansion cavity, and the dispersion holes are evenly distributed in a circle on the inner surface of the inner expansion cavity of the air blowing channel.

[0008] Preferably, the dispersing pores adopt an upwardly inclined circular hole structure.

[0009] Preferably, the inner surface of the threaded mounting groove of the film bottom mold body is provided with an inner ring positioning protrusion, and one end of the extrusion nozzle is pressed against the surface of the inner ring positioning protrusion.

[0010] Preferably, the outer film mold body is bolted to the upper surface of the film bottom mold body, and the outer film mold body is fixed to the upper surface of the film bottom mold body by four bolts.

[0011] Compared with the prior art, the present invention provides a PE film blow molding die, which has the following beneficial effects: By adopting a film bottom mold body and a film outer mold body external mounting structure, which are wrapped and fixed to the outside of the film blow mold body, a cavity blow molding is formed. It is easy to install and disassemble, easy to clean the blow molding cavity, easy to maintain, simple in structure and low in cost. Furthermore, a dispersion air hole is set at the upper outlet of the air outlet, so that the film can be blown out by airflow at the outlet and will not shrink inward and stick to the upper end of the film blow mold body. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure; Figure 2 This is a schematic diagram of the overall structure cross-section; Figure 3This is a cross-sectional view of the overall structure (a partial installation diagram of the extrusion nozzle). Figure 4 This is a schematic diagram of a partial structure of an extrusion nozzle; Figure 5 This is a schematic diagram of a partial structure of the outer mold body of the thin film.

[0013] In the figure: 1. Film blow molding body, 2. Air blowing channel, 3. Film bottom mold body, 4. Annular positioning protrusion, 5. Air blowing port, 6. Locking nut, 7. Film outer mold body, 100. Blow molding cavity, 200. Dispersing air hole, 8. Threaded mounting groove, 10. Extrusion nozzle, 11. Hexagonal protrusion, 70. Bolt, 9. Inner ring positioning protrusion. Detailed Implementation

[0014] 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.

[0015] This utility model provides a technical solution: a PE film blow molding die, comprising a film blow molding body 1, an air blowing channel 2 provided on the inner surface of the film blow molding body 1, a film bottom mold body 3 fixedly connected to the lower outer surface of the film blow molding body 1, an air blowing port 5 provided at the lower end of the film blow molding body 1, an annular positioning protrusion 4 provided on the outer surface of the air blowing port 5, the film bottom mold body 3 being snapped onto the outer surface of the annular positioning protrusion 4, a locking nut 6 threadedly connected to the outer surface of the air blowing port 5, and a film outer mold fixedly connected to the upper surface of the film bottom mold body 3. The main body 7, the film blow mold body 1, the film bottom mold body 3, and the film outer mold body 7 are provided with a blow molding cavity 100. The upper inner surface of the air channel 2 is provided with a dispersion air hole 200. By adopting the external mounting structure of the film bottom mold body and the film outer mold body, it is wrapped and fixed to the outside of the film blow mold body from the top and bottom, forming a cavity for blow molding. It is easy to install and disassemble, easy to clean the blow molding cavity, and easy to maintain. Furthermore, a dispersion air hole is provided at the upper outlet of the air outlet so that the film can be blown out by airflow at the outlet and will not shrink inward and stick to the upper end of the film blow mold body. The lower outer surface of the film mold body 3 is provided with a threaded mounting groove 8. An extrusion nozzle 10 is installed in the threaded mounting groove 8 of the film mold body 3 by means of threads. The extrusion nozzle 10 is installed with the threaded mounting groove 8. The extrusion nozzle 10 is easy to install and easy to disassemble. The extrusion nozzle 10 can introduce plastic melt and guide it upward into the blow molding cavity 100 for discharge. The inner surface of the film blow molding body 1 is provided with an air blowing channel 2, which can blow air outward to allow the plastic film to be blown out. One end of the extrusion nozzle 10 is provided with an external thread, and the other end of the extrusion nozzle 10 is provided with a hexagonal protrusion 11; a wrench can be locked in the hexagonal protrusion 11 to twist and install or remove the extrusion nozzle 10, making the installation and removal operation convenient. An inner expansion cavity is provided at the upper end of the air blowing channel 2, and the dispersion holes 200 are evenly distributed in a circle on the inner surface of the inner expansion cavity of the air blowing channel 2. When the plastic film is blown out, the dispersion holes 200 of the air blowing channel 2 can discharge the airflow outward when the plastic film is discharged from the upper end of the film blowing mold body 1, which can prevent the plastic film from shrinking and sticking to the surface of the film blowing mold body 1 during discharge, and it will not stick and be damaged. The dispersion vent 200 adopts an upward inclined circular hole structure; blowing upwards facilitates the expansion of the plastic film; the inner surface of the threaded mounting groove 8 of the film bottom mold body 3 is provided with an inner ring positioning protrusion 9, and one end of the extrusion nozzle 10 is pressed against the surface of the inner ring positioning protrusion 9; after installation, the support is stable, and it is convenient to press and lock, and the extrusion nozzle 10 is installed stably. The outer film mold body 7 is mounted on the upper surface of the film bottom mold body 3 by bolts 70. The outer film mold body 7 is fixed to the upper surface of the film bottom mold body 3 by four bolts 70. The installation of the outer film mold body 7 by bolts 70 is convenient and stable. The working principle of this device is as follows: During use, a film bottom mold body 3 is fixedly connected to the lower outer surface of the film blow molding body 1. An air outlet 5 is provided at the lower end of the film blow molding body 1. An annular positioning protrusion 4 is provided on the outer surface of the air outlet 5. The film bottom mold body 3 is snapped into the outer surface of the annular positioning protrusion 4. A locking nut 6 is threadedly connected to the outer surface of the air outlet 5 (when disassembling the bottom film bottom mold body 3, the locking nut 6 can be twisted downwards to disassemble it, and the locking nut 6 can be pulled downwards to remove it. At this time, the bottom film bottom mold body 2 can be pulled downwards, which is convenient to use and easy to assemble and disassemble). A film outer mold body 7 is fixedly connected to the upper surface of the film bottom mold body 3 by bolts 70. A blow molding cavity 100 is provided between the film blow molding body 1, the film bottom mold body 3, and the film outer mold body 7. The mold assembly is convenient and stable, and the blow molding cavity 100 is easy to clean after disassembly. It is easy to use; the mechanism is simple and the cost is low. A threaded mounting groove 8 is provided on the lower outer surface of the film mold body 3. An extrusion nozzle 10 is threadedly installed in the threaded mounting groove 8 of the film mold body 3. The installation is convenient, as the extrusion nozzle 10 is installed in the threaded mounting groove 8. The extrusion nozzle 10 is easy to install and disassemble. The extrusion nozzle 10 can introduce molten plastic and guide it upward into the blow molding cavity 100 for discharge. An air blowing channel 2 is provided on the inner surface of the film blow molding body 1, which can blow air outward to discharge the plastic film. A dispersion air hole 200 is provided on the upper inner surface of the air blowing channel 2. An inner expansion cavity is provided at the upper end of the air blowing channel 2, and the dispersion air holes 200 are evenly distributed in a circle on the inner surface of the inner expansion cavity of the air blowing channel 2. When the plastic film is blown out, as the plastic film exits the upper end of the film blow molding body 1, the dispersion air hole 200 of the air blowing channel 2 can discharge the airflow outward, which can prevent the plastic film from shrinking and sticking to the surface of the film blow molding body 1 during discharge, and it will not stick and be damaged.

[0016] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0017] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A PE film blow molding die, comprising a film blow molding body (1), characterized in that: The inner surface of the film blow molding body (1) is provided with an air blowing channel (2). The lower outer surface of the film blow molding body (1) is fixedly connected to a film bottom mold body (3). The lower end of the film blow molding body (1) is provided with an air blowing port (5). The outer surface of the air blowing port (5) is provided with an annular positioning protrusion (4). The film bottom mold body (3) is snapped onto the outer surface of the annular positioning protrusion (4). The outer surface of the air blowing port (5) is connected with a locking nut (6) by a thread. The upper surface of the film bottom mold body (3) is fixedly connected to a film outer mold body (7). A blow molding cavity (100) is provided between the film blow molding body (1), the film bottom mold body (3), and the film outer mold body (7). The upper inner surface of the air blowing channel (2) is provided with a dispersing air hole (200).

2. The PE film blow molding die according to claim 1, characterized in that: The lower outer surface of the film mold body (3) is provided with a threaded mounting groove (8), and an extrusion nozzle (10) is installed in the threaded mounting groove (8) of the film mold body (3) by thread.

3. The PE film blow molding die according to claim 2, characterized in that: One end of the extrusion nozzle (10) is provided with an external thread, and the other end of the extrusion nozzle (10) is provided with a hexagonal protrusion (11).

4. The PE film blow molding die according to claim 1, characterized in that: The upper end of the air blowing channel (2) is provided with an inner expansion cavity, and the dispersion holes (200) are evenly distributed in a circle on the inner surface of the inner expansion cavity of the air blowing channel (2).

5. A PE film blow molding die according to claim 1, characterized in that: The dispersion pores (200) adopt an upward inclined circular hole structure.

6. A PE film blow molding die according to claim 2, characterized in that: The inner surface of the threaded mounting groove (8) of the film bottom mold body (3) is provided with an inner ring positioning protrusion (9), and one end of the extrusion nozzle (10) is pressed against the surface of the inner ring positioning protrusion (9).

7. A PE film blow molding die according to claim 1, characterized in that: The upper surface of the film bottom mold body (3) is fitted with the film outer mold body (7) by bolts (70), and the film outer mold body (7) is fixed to the upper surface of the film bottom mold body (3) by four bolts (70).

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