Five-layer co-extrusion PVDC film blowing mold

Abstract

The utility model discloses a five-layer co-extrusion PVDC film blowing mold which comprises a mold body, the mold body comprises a base, a main mold column is fixedly installed at the upper end of the base, a mold head is fixedly installed at the upper end of the main mold column, a plurality of feeding ports are formed in the periphery of the base, a connecting disc is arranged between the base and a material disc, and a mold column installation disc is arranged at the top of the connecting disc. The main die column comprises a die column head and a plurality of connecting columns which are sequentially arranged in a sleeving mode from small to large in diameter, spiral flow channels are formed in the peripheries of the connecting columns, a plurality of first horizontal flow channels are formed in the bottoms of the base, the connecting disc and the mounting disc, and a peripheral feeding port and the connecting disc between the base and the material disc reduce non-uniformity when materials enter all layers; the overall quality of the film is improved, the material mixing effect is enhanced through the multiple spiral runners in the main die column, all layers of materials can be better fused before extrusion, the interlayer adhesive force and physical performance of the film are improved, and the problems of material retention and uneven distribution are solved.

Description

Technical Field

[0001] This utility model relates to the technical field of plastic film production equipment, and in particular to a 5-layer co-extrusion PVDC blown film mold. Background Technology

[0002] A 5-layer co-extrusion PVDC blown film mold is a specialized piece of equipment used to produce five-layer polyvinyl chloride (PVDC) blown film. Through five-layer co-extrusion technology, different materials are layered and combined to enhance gas barrier properties, moisture resistance, and mechanical strength. It is widely used in the production of high-barrier packaging materials. The mold is precisely designed to ensure uniform flow of each layer and clear interfaces, meeting the manufacturing requirements of high-quality packaging films.

[0003] Chinese utility model patent CN217622172U discloses a 5-layer co-extrusion PVDC blown film mold, including a base. A main die column is fixedly installed on the upper end of the base, and a die head is fixedly installed on the upper end of the main die column. Five sets of material trays are installed on the outer side of the upper end of the base near the main die column. Four sets of partition plates are arranged between the five sets of material trays. Injection ports are opened on one side of each of the five sets of material trays. An upper fixing plate is fixedly installed on the upper end of the five sets of material trays. Two sets of connecting seats are fixedly installed on the upper end of the upper fixing plate near the outer side of the die head. Connecting slots are opened on the upper and lower sides of the five sets of material trays corresponding to the five sets of injection ports. The 5-layer co-extrusion PVDC blown film mold of this utility model achieves the effect of ten layers by opening flow channels on the upper and lower sides of the material trays, thereby accelerating the flow of materials.

[0004] However, the above-mentioned 5-layer co-extruded PVDC blown film mold still has the following defects:

[0005] Co-extrusion blown film molds are molds that extrude multiple molten plastic materials together to form a ring-shaped film. The above-mentioned feed ports are located in different layers. The co-extrusion of the upper and lower layers can easily cause uneven material distribution, resulting in uneven products and the phenomenon that the product is too thick or too thin in some places. Therefore, this technology still has some room for improvement. Utility Model Content

[0006] The purpose of this invention is to provide a 5-layer co-extrusion PVDC blown film mold to solve the above-mentioned problems existing in the prior art.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a 5-layer co-extrusion PVDC blown film mold, comprising a mold body, the mold body including a base, a main mold column fixedly installed at the upper end of the base, a mold head fixedly installed at the upper end of the main mold column, and five sets of material trays arranged sequentially from bottom to top between the mold head and the base. The main mold column is characterized by: several inlet ports arranged on the outer periphery of the base; a connecting plate arranged between the base and the material trays; a mold column mounting plate arranged on the top of the connecting plate; the main mold column including a mold column head and several connecting columns arranged sequentially from small to large diameter; a spiral flow channel arranged on the outer periphery of each connecting column; a first horizontal flow channel arranged at the bottom of the base, connecting plate, and mounting plate; and an outlet corresponding to the spiral flow channel of the connecting column arranged on the top of the mounting plate, the outlet communicating with the first horizontal flow channel.

[0008] By adopting the above technical solution, a more uniform material supply is achieved through the outer peripheral inlet and the connecting plate between the base and the material tray, reducing the unevenness of the material when entering each layer and improving the overall quality of the film. Several spiral flow channels inside the main mold column enhance the mixing effect of the material, allowing the materials of each layer to better fuse before extrusion, improving the interlayer adhesion and physical properties of the film, avoiding the problems of material retention and uneven distribution, and further improving the film production efficiency and product quality.

[0009] The aforementioned 5-layer co-extrusion PVDC blown film mold can be further configured such that: a plurality of first gaps are provided between the connecting columns above the spiral flow channel; a second gap is provided between the connecting columns and the die head and between the connecting columns and the die head; and a third gap is provided between the die head and the die head. The first gap, the second gap, and the third gap are interconnected, causing the raw material to flow through the first gap into the second gap and then into the third gap.

[0010] By adopting the above technical solution—the interconnected structure of the first gap, the second gap, and the third gap—the raw materials can flow smoothly from the first gap into the second gap and finally converge into the third gap. This ensures that the raw materials in each layer are fully mixed and preheated before entering the die head, reducing the residence time of the materials in the mold, improving production efficiency, and enhancing the interfacial bonding force between the layers. This results in the blown film having better interlayer adhesion and overall physical properties, thereby improving product quality.

[0011] The aforementioned 5-layer co-extrusion PVDC blown film mold can be further configured such that: the height of the connecting columns decreases sequentially to both sides with the third gap as the center, forming a triangular arrangement that causes the first gap to form a height difference; the bottom of the connecting column is also provided with a second horizontal flow channel, which is connected to the discharge port and the spiral flow channel; the connecting column whose height of the first gap is closest to the third gap directly abuts against the mounting plate, causing the spiral flow channel of the connecting column whose height of the first gap is closest to the third gap to be directly connected to the discharge port.

[0012] By adopting the above technical solution: since the connecting columns are arranged in sequence with increasing diameter and the first horizontal flow channel is set accordingly, the length of each feeding path will vary. The length of each feeding path is controlled by the height difference formed by the connecting column height decreasing from the third gap to both sides, and the second horizontal flow channel is set at the bottom of the connecting column. The connecting column with the first gap height closest to the third gap directly abuts against the mounting plate. This ensures that each feeding material can flow into the third gap for mixing at the same time, reducing the non-uniformity of materials when entering each layer and improving the overall quality of the film.

[0013] The aforementioned 5-layer co-extrusion PVDC blown film mold can be further configured such that: the material tray, the base, and the die head are all provided with connecting holes, and the material tray, the base, and the die head are all provided with insertion posts on the side facing the connecting holes, and the insertion posts are inserted into the connecting holes to make the material tray, the base, and the die head fixedly connected.

[0014] By adopting the above technical solution, the precise fit between the plug-in pins and connecting holes allows for easy alignment and tight connection of all components, eliminating the need for complex tools or operating skills. This simplifies the mold installation process and improves production efficiency. Simultaneously, this plug-in connection structure enhances the overall stability of the mold, reducing the risk of component loosening or displacement due to vibration or tension during production, thus ensuring the consistency and stability of film quality.

[0015] The aforementioned 5-layer co-extrusion PVDC blown film mold can be further configured as follows: the bottom of the base is provided with a circular abutment groove, the connecting column with the smallest diameter is fixedly connected to the mold column head, the center of the base, the mold column head and the connecting column with the smallest diameter are provided with a through hole for external equipment to pass through, and the base is provided with a limiting groove along the axial direction at the edge of the through hole for limiting during installation.

[0016] By adopting the above technical solution: the circular abutment groove provides stable support for the base, ensuring that the mold will not shift due to vibration during production; the fixed connection between the smallest diameter connecting column and the mold column head, as well as the through hole provided in the center of the base, mold column head, and connecting column, allow external equipment (such as cooling water pipes, air pressure sensors, etc.) to be easily connected to the inside of the mold, improving production flexibility and efficiency; at the same time, the limiting groove on the base located at the edge of the through hole along the axial direction has a significant limiting effect during mold installation, preventing excessive movement or rotation of the mold during installation, ensuring accurate alignment between the various parts of the mold, thereby ensuring the consistency and stability of film quality.

[0017] The beneficial effects of this utility model are as follows:

[0018] The outer feed port and the connecting plate between the base and the material tray enable a more uniform material supply, reduce the unevenness of material entering each layer, and improve the overall quality of the film. Several spiral flow channels inside the main mold column enhance the mixing effect of the material, allowing the materials of each layer to better fuse before extrusion, improving the interlayer adhesion and physical properties of the film, and avoiding the problems of material retention and uneven distribution.

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a cross-sectional view of the present invention;

[0022] Figure 3 This is a schematic diagram of the connecting disc structure of this utility model;

[0023] Figure 4 This is a schematic diagram of the connecting column structure of this utility model;

[0024] Figure 5 This is a schematic diagram of the mounting disk structure of this utility model;

[0025] Figure 6 This is a schematic diagram of the base structure of this utility model;

[0026] Label annotations: 1-Mold body, 2-Base, 3-Main mold pillar, 4-Mold head, 5-Material tray, 6-Inlet, 7-Connecting plate, 8-Mounting plate, 9-Connecting pillar, 10-Spiral flow channel, 11-First horizontal flow channel, 12-Outlet, 13-First gap, 14-Second gap, 15-Third gap, 16-Second horizontal flow channel, 17-Connecting hole, 18-Insertion pillar, 19-Circular abutment groove, 20-Through hole, 21-Limiting groove, 22-Mold pillar head. Detailed Implementation

[0027] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] like Figure 1-6The present invention provides the following technical solution: a 5-layer co-extrusion PVDC blown film mold, comprising a mold body 1, a base 2, a main mold column 3 fixedly mounted on the upper end of the base 2, a mold head 4 fixedly mounted on the upper end of the main mold column 3, five sets of material trays 5 arranged sequentially from bottom to top between the mold head 4 and the base 2, a plurality of material inlets 6 arranged on the outer periphery of the base 2, a connecting plate 7 arranged between the base 2 and the material trays 5, a mold column mounting plate 8 arranged on the top of the connecting plate 7, the main mold column 3 comprising a mold column head 22 and a plurality of connecting columns 9 arranged sequentially from small to large diameter, a spiral flow channel 10 arranged on the outer periphery of each connecting column 9, a first horizontal flow channel 11 arranged at the bottom of the base 2, the connecting plate 7 and the mounting plate 8, and a spiral flow channel 10 connected to the connecting column 9 arranged on the top of the mounting plate 8. Correspondingly, the discharge port 12 is connected to the first horizontal flow channel 11. Through the outer peripheral inlet 6 and the connecting plate 7 between the base 2 and the material tray 5, a more uniform material supply is achieved, reducing the unevenness of the material when entering each layer and improving the overall quality of the film. Several spiral flow channels 10 inside the main die column 3 enhance the mixing effect of the material, allowing the materials of each layer to better fuse before extrusion, improving the interlayer adhesion and physical properties of the film, avoiding the problems of material retention and uneven distribution, and further improving the production efficiency and product quality of the film. Several first gaps 13 are provided between the connecting columns 9 above the spiral flow channels 10, and second gaps 14 are provided between the connecting columns 9 and the die head 22 and between the connecting columns 9 and the die head 4. A third gap 15 is provided between the mold column head 22 and the mold head 4. The first gap 13, the second gap 14, and the third gap 15 are interconnected, allowing the raw material to flow from the first gap 13 into the second gap 14 and then into the third gap 15. This interconnected structure allows the raw material to flow smoothly from the first gap 13 into the second gap 14 and finally into the third gap 15, ensuring that the raw materials of each layer are fully mixed and preheated before entering the mold head 4. This reduces the residence time of the material in the mold, improves production efficiency, and enhances the interfacial bonding force between the layers, resulting in a better interlayer adhesion and overall physical properties of the final blown film, thereby improving product quality. The height of the connecting column 9 is based on the first gap 13. The three gaps 15 are arranged in a triangle, decreasing in size from the center outwards, creating a height difference in the first gap 13. A second horizontal flow channel 16 is also provided at the bottom of the connecting column 9. This second horizontal flow channel 16 communicates with the discharge port 12 and the spiral flow channel 10. The connecting column 9, whose height is closest to the third gap 15 in the first gap 13, directly abuts against the mounting plate 8, causing the spiral flow channel 10 of the connecting column 9, whose height is closest to the third gap 15, to directly connect with the discharge port 12. Because the diameters of the connecting columns 9 are arranged in ascending order, and the first horizontal flow channels 11 are correspondingly arranged, the paths for each type of material input will have varying lengths. The height difference formed by the decreasing height of the connecting columns 9 from the third gap 15 outwards, and the second horizontal flow channel 16 at the bottom of the connecting column 9, contribute to this variation.The connecting post 9, whose height is closest to that of the third gap 15, directly abuts against the mounting plate 8 to control the length of each feed path. This ensures that each feed item flows into the third gap 15 at the same time for mixing, reducing material unevenness when entering each layer and improving the overall quality of the film.

[0029] like Figure 1-6 The present invention provides the following technical solution: a 5-layer co-extrusion PVDC blown film mold, wherein the material tray 5, the base 2 and the die head 4 are all provided with connection holes, and the material tray 5, the base 2 and the die head 4 are all provided with insertion pins 18 on the side facing the connection holes. The insertion pins 18 are inserted into the connection holes to make the material tray 5, the base 2 and the die head 4 fixedly connected. Through the precise cooperation between the insertion pins 18 and the connection holes, each component can be easily aligned and tightly connected without complicated tools or operating skills, simplifying the mold installation process and improving production efficiency. Meanwhile, this plug-in connection structure enhances the overall stability of the mold, reducing the risk of component loosening or displacement due to vibration or tension during production, and ensuring the consistency and stability of film quality. The base 2 has a circular abutment groove 19 at its bottom, and the smallest diameter connecting post 9 is fixedly connected to the mold head 22. The base 2, mold head 22, and the smallest diameter connecting post 9 all have through holes 20 for external equipment to pass through. The base 2 has a limiting groove 21 along the axial direction next to the through hole 20 for positioning during installation. The circular abutment groove 19 provides stable support for the base 2, ensuring the mold's stability during production. The mold will not shift due to vibration during production. The fixed connection between the smallest diameter connecting column 9 and the mold column head 22, as well as the through hole 20 provided in the center of the base 2, the mold column head 22 and the connecting column 9, allow external equipment (such as cooling water pipes, air pressure sensors, etc.) to be easily connected to the inside of the mold, improving the flexibility and efficiency of production. At the same time, the limiting groove 21 opened axially on the side of the through hole 20 on the base 2 has a significant limiting effect during mold installation, preventing excessive movement or rotation of the mold during installation, ensuring accurate alignment between the various parts of the mold, thereby ensuring the consistency and stability of the film quality.

[0030] The beneficial effects of this utility model are as follows:

[0031] The outer feed port 6 and the connecting plate 7 between the base 2 and the material tray 5 enable a more uniform material supply, reduce the unevenness of the material when entering each layer, and improve the overall quality of the film. The several spiral flow channels 10 inside the main mold column 3 enhance the mixing effect of the material, so that the materials of each layer can be better integrated before extrusion, improve the interlayer adhesion and physical properties of the film, and avoid the problems of material retention and uneven distribution.

Claims

1. A 5-layer co-extrusion PVDC blown film mold, comprising a mold body, the mold body including a base, a main mold column fixedly mounted on the upper end of the base, a mold head fixedly mounted on the upper end of the main mold column, and five sets of material trays arranged sequentially from bottom to top between the mold head and the base on the main mold column, characterized in that: The base has several inlets on its outer periphery. A connecting plate is provided between the base and the material tray. A mold column mounting plate is provided on the top of the connecting plate. The main mold column includes a mold column head and several connecting columns with diameters ranging from small to large. The outer periphery of each connecting column is provided with a spiral flow channel. The bottom of the base, the connecting plate, and the mounting plate are all provided with several first horizontal flow channels. The top of the mounting plate is provided with an outlet corresponding to the spiral flow channel of the connecting column. The outlet communicates with the first horizontal flow channel.

2. The 5-layer co-extrusion PVDC blown film mold according to claim 1, characterized in that: Several first gaps are provided between the connecting columns above the spiral flow channel. Second gaps are provided between the connecting columns and the mold column head, and between the connecting columns and the mold head. Third gaps are provided between the mold column head and the mold head. The first gaps, second gaps, and third gaps are interconnected, which allows the raw material to flow through the first gaps into the second gaps and then into the third gap.

3. The 5-layer co-extrusion PVDC blown film mold according to claim 2, characterized in that: The height of the connecting columns decreases sequentially from the third gap to both sides, forming a triangular arrangement that causes a height difference in the first gap. The bottom of the connecting column is also provided with a second horizontal flow channel, which is connected to the discharge port and the spiral flow channel. The connecting column whose height in the first gap is closest to the third gap directly abuts against the mounting plate, causing the spiral flow channel of the connecting column whose height in the first gap is closest to the third gap to be directly connected to the discharge port.

4. The 5-layer co-extrusion PVDC blown film mold according to claim 3, characterized in that: The material tray, base, and die head are all provided with connection holes. The material tray, base, and die head are all provided with insertion pins on the side facing the connection holes. The insertion pins are inserted into the connection holes to make the material tray, base, and die head fixedly connected.

5. A 5-layer co-extrusion PVDC blown film mold according to any one of claims 1-4, characterized in that: The base has a circular abutment groove at the bottom. The connecting column with the smallest diameter is fixedly connected to the mold column head. The base, the mold column head and the connecting column with the smallest diameter are provided with a through hole for external equipment to pass through. The base is provided with a limiting groove along the axial direction at the edge of the through hole for limiting the position during installation.

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