Adjustable extrusion die for plastic packaging film production

Abstract

This utility model discloses an adjustable extrusion die for producing plastic sealant film, belonging to the technical field of plastic sealant film processing equipment. It includes a relatively fixed upper die and a lower die. The upper die has an upper cavity, and the lower die has a lower cavity. The connecting portion at the front ends of the upper and lower cavities forms a co-extrusion cavity. The outer side walls of the front ends of both the upper and lower cavities are provided with inclined wedge surfaces. Movable plates are slidably mounted on the inclined wedge surfaces. The front end of the movable plate is located at the front end of the co-extrusion cavity, and an extrusion gap is formed between the front ends of the two movable plates. The extrusion gap communicates with the co-extrusion cavity, and the size of the extrusion gap can be changed by moving the movable plates. This adjustable extrusion die for producing plastic sealant film allows for adjustment of the extrusion gap size independently of the relative movement between the upper and lower dies. The die size adjustment is convenient, saving labor, reducing production costs, and ensuring reliable operation.

Description

Technical Field

[0001] This utility model relates to the technical field of plastic sealant processing equipment, and in particular, to an adjustable extrusion die for plastic sealant production. Background Technology

[0002] Plastic sealing film is a type of plastic film widely used for packaging, protecting, and decorating various items. The main molding and processing technology for plastic sealing film is melt extrusion molding. Specifically, synthetic resins such as polyethylene and polypropylene, along with additives, are mixed evenly and then heated and melted in a melting machine until a viscous molten state is formed. The molten material is then extruded through an extrusion die of an extruder, forming a thin film under the action of the die. To meet usage requirements, the extrusion dies used in the extrusion molding process are usually adjustable, allowing for the production of plastic sealing films of different thicknesses by adjusting the die size. For example, Chinese patent document CN217803228U discloses a novel die for processing plastic films, which includes a die head, a fine-tuning mechanism, and a fixed base. The die head consists of a fixed die and a moving die, with a discharge channel between the fixed and moving dies. During adjustment, the moving die can move under the action of an internal sliding rod, thereby changing the width of the discharge channel between the moving and fixed dies, and thus changing the film thickness. However, this method mainly relies on the relative movement between the moving and fixed dies on the die head to adjust the die size. Larger moving dies need to be designed as movable structures, making the structural design relatively complex. In addition, after the moving die moves, the connection position of the feeding mechanism (e.g., through a screw extruder) that docks with the rear end of the moving die also needs to be adjusted to meet the docking requirements, which is cumbersome to operate, has high production costs, and affects production efficiency. Utility Model Content

[0003] The technical problem to be solved by this utility model is: in order to overcome the above-mentioned defects in the prior art, an adjustable extrusion die head for producing plastic sealant is provided that is easy to operate and has high production efficiency.

[0004] The technical solution adopted by this utility model to solve its technical problem is: an adjustable extrusion die for producing plastic sealing film, including a relatively fixed upper die and a lower die. The upper die is provided with an upper die cavity, and the lower die is provided with a lower die cavity. The connecting part at the front end of the upper die cavity and the lower die cavity forms a co-extrusion cavity. The outer side wall of the front end of the upper die and the lower die is provided with a wedge surface. A movable plate is slidably provided on the wedge surface. The front end of the movable plate is located at the front end of the co-extrusion cavity, and an extrusion gap is formed between the front ends of the two movable plates. The extrusion gap is connected to the co-extrusion cavity. Moving the movable plate can change the size of the extrusion gap.

[0005] Furthermore, the movable plate includes a slide plate and a baffle plate connected to each other. The slide plate is slidably connected to the wedge surface, and the baffle plate is vertically disposed in front of the co-extrusion cavity. The extrusion gap is formed by the gap between the two baffle plates.

[0006] Furthermore, the side of the baffle away from the slide plate and close to the co-extrusion cavity is configured with an arc-shaped structure.

[0007] Furthermore, a seal is installed on the front end of the wedge surface.

[0008] Furthermore, a fixing block is fixedly connected to the inclined wedge surface, and a sliding groove is formed on the surface of the slider, the sliding groove slidingly engaging with the fixing block.

[0009] Furthermore, a fixing plate is fixedly connected to the inclined wedge surface, a connecting plate is fixedly connected to the sliding plate, and a bolt is rotatably installed on the fixing plate, the bolt passing through the fixing plate and being threadedly connected to the fixing plate.

[0010] Furthermore, an anti-slip knob is fixedly connected to the end of the bolt.

[0011] Furthermore, the inclined wedge surface is provided with a scale, and the direction of the scale is the same as the sliding direction of the slide plate.

[0012] Furthermore, a partition is fixedly provided between the upper and lower dies, and the front end of the partition extends into the co-extrusion cavity.

[0013] The beneficial effects of this invention are as follows: The adjustable extrusion die head for producing plastic sealant can adjust the size of the extrusion gap between the two front ends via a sliding movable plate, thus realizing the function of adjusting the die head orifice size. Compared with the prior art, the adjustment of the extrusion gap size does not depend on the relative movement between the upper and lower dies, avoiding the need to readjust the position of the feeding mechanism every time the extrusion gap is adjusted, saving labor and reducing production costs. In addition, the upper and lower dies are relatively fixed, and the channel for conveying molten material between them remains unchanged, ensuring the stability of material movement and making it more reliable in use. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a perspective view of the adjustable extrusion die for producing plastic sealant according to this utility model;

[0016] Figure 2 yes Figure 1 The image shown is a perspective view of another angle of the adjustable extrusion die for producing plastic sealant.

[0017] Figure 3 yes Figure 1 The top view of the adjustable extrusion die for producing plastic sealant is shown.

[0018] Figure 4yes Figure 3 The image shows a cross-sectional view along AA of an adjustable extrusion die for producing plastic sealant.

[0019] In the diagram: 10. Upper die, 101. Upper die cavity, 120. Co-extrusion cavity, 1011. First feed port, 102. Wedge surface, 103. Seal, 104. Fixing block, 105. Fixing plate, 106. Bolt, 1061. Anti-slip knob, 107. Scale, 20. Lower die, 201. Lower die cavity, 2011. Second feed port, 30. Movable plate, 301. Extrusion gap, 31. Slide plate, 311. Slide groove, 312. Connecting plate, 32. Baffle, 321. Arc-shaped structure, 40. Partition plate, 50. Sealing plate. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0021] Please see Figures 1-4 This utility model provides an adjustable extrusion die for producing plastic sealing film, including a relatively fixed upper die 10 and a lower die 20. In use, both the upper die 10 and the lower die 20 are fixedly mounted on a support bracket. The upper die 10 has an upper die cavity 101, and the lower die 20 has a lower die cavity 201. The upper die cavity 101 and the lower die cavity 201 are connected at their front ends and separated at their rear ends. The connecting portion at the front ends of the upper die cavity 101 and the lower die cavity 201 forms a co-extrusion cavity 120. Movable plates 30 are movably mounted on both the upper die 10 and the lower die 20 at the front ends of the co-extrusion cavity 120. Moving the movable plates 30 changes the outlet size of the co-extrusion cavity 120. In this embodiment, an extrusion gap 301 is formed between the front ends of the two movable plates 30. The extrusion gap 301 communicates with the co-extrusion cavity 120 and constitutes the outlet of the co-extrusion cavity 120.

[0022] In this embodiment, a first feed port 1011 is formed at the end of the upper die cavity 101 away from the co-extrusion cavity 120, and a second feed port 2011 is formed at the end of the lower die cavity 201 away from the co-extrusion cavity 120. The first feed port 1011 and the second feed port 2011 are used to feed different molten materials into the corresponding die cavities, for example, two materials with different melting points can be fed in. During operation, the molten material is fed into the upper die cavity 101 and the lower die cavity 201 from the first feed port 1011 and the second feed port 2011, respectively. Under pressure, it flows forward and finally merges in the co-extrusion cavity 120. Then, it is extruded through the extrusion gap 301 between the two movable plates 30 and finally forms a plastic sealing film after cooling.

[0023] Both the first feed port 1011 and the second feed port 2011 are connected to a feeding mechanism, which can be a screw extruder or similar mechanism, and is not limited here. Since the upper die 10 and the lower die 20 are relatively fixed, and the change in the size of the extrusion gap 301 does not depend on the positional change between the upper die 10 and the lower die 20, the position of the feeding mechanism connected to the upper die 10 and the lower die 20 does not need to be adjusted according to the die head, saving labor and reducing production costs.

[0024] In this embodiment, a partition 40 is fixedly provided between the upper mold 10 and the lower mold 20. The front end of the partition 40 extends into the co-extrusion cavity 120. The co-extrusion cavity 120 can reduce the mixing of the molten material on both sides in the co-extrusion cavity 120, so that the plastic seal film extruded through the extrusion gap 301 presents a distinct two-layer structure.

[0025] The outer walls of the front ends of both the upper die 10 and the lower die 20 are configured as wedge surfaces 102. A movable plate 30 is slidably disposed on the wedge surface 102. Specifically, the movable plate 30 includes a slide plate 31 and a baffle plate 32 connected to each other. The slide plate 31 is slidably connected to the wedge surface 102, and the baffle plate 32 is vertically disposed in front of the co-extrusion cavity 120. The extrusion gap 301 is formed by the gap between the two baffle plates 32. When adjusting the extrusion gap 301, the slide plate 31 is slid along the wedge surface 101, which drives the baffle plate 32 to move. When the slide plate 31 is slid upward along the wedge surface 101, the extrusion gap 301 between the two baffle plates 32 increases; when the slide plate 31 is slid downward along the wedge surface 101, the extrusion gap 301 between the two baffle plates 32 decreases. In this way, the function of adjusting the size of the extrusion gap 301 is realized by the movable plate 30 disposed outside the upper die 10 and the lower die 20.

[0026] In a preferred embodiment, the end of the baffle 32 furthest from the slide plate 31, near the co-extrusion cavity 120, is configured with an arc-shaped structure 321. This arc-shaped structure 321 allows the molten material in the co-extrusion cavity 120 to pass stably through the extrusion gap 301. Additionally, a seal 103 is installed on the front end of the wedge surface 102. The seal 103 tightly abuts against the slide plate 31 to prevent leakage of molten material from the connection between the slide plate 31 and the wedge surface 102. The seal 103 is made of high-temperature resistant silicone material.

[0027] In this embodiment, a fixing block 104 is fixedly connected to the wedge surface 102, and a groove 311 is formed on the surface of the slide plate 31, which slides in cooperation with the fixing block 104. Further, a fixing plate 105 is fixedly connected to the wedge surface 102, and a connecting plate 312 is fixedly connected to the slide plate 31. A bolt 106 is rotatably mounted on the fixing plate 105, passing through the fixing plate 105 and threadedly connected to it. In use, rotating the bolt 106 drives the connecting plate 312 to move the slider 31, thereby adjusting the position of the movable plate 30 and adjusting the size of the extrusion gap 301. The movement of the movable plate 30 driven by the bolt 106 allows for fine-tuning, and the bolt 106 also has a self-locking function, effectively preventing the movable plate 30 from shifting. Furthermore, an anti-slip knob 1061 is fixedly connected to the end of the bolt 106, facilitating the user's rotation of the bolt 106.

[0028] As a preferred embodiment, the wedge surface 102 is provided with a scale 107, and the direction of the scale 107 is the same as the sliding direction of the skateboard 31, so as to make it convenient for the user to know the sliding distance of the skateboard 31.

[0029] In this embodiment, a sealing plate 50 is fixedly installed between the upper mold 10 and the lower mold 20. The sealing plate 50 is sealed and fixedly connected to the ends of the upper mold 10, the lower mold 20 and the partition plate 40. At the same time, the movable plate 30 is slidably sealed to the sealing plate 50 to prevent the molten material in the co-extrusion cavity 120 from leaking.

[0030] This utility model discloses an adjustable extrusion die for producing plastic sealing films. The size of the extrusion gap 301 between the upper die 10 and the lower die 20 can be adjusted via a sliding movable plate 30, thus achieving the function of adjusting the die opening size. Compared with existing technologies, the adjustment of the extrusion gap 301 does not depend on the relative movement between the upper die 10 and the lower die 20, avoiding the need to readjust the position of the feeding mechanism each time the extrusion gap 301 is adjusted, saving labor and reducing production costs. Furthermore, since the upper die 10 and the lower die 20 are relatively fixed, the channel for conveying molten material between them remains unchanged, ensuring the stability of material movement and making it more reliable.

[0031] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An adjustable extrusion die for producing plastic sealant, characterized in that: The device includes a relatively fixed upper die and a lower die. The upper die has an upper die cavity, and the lower die has a lower die cavity. The connecting portion at the front end of the upper die cavity and the lower die cavity forms a co-extrusion cavity. The outer side wall of the front end of the upper die and the lower die is provided with a wedge surface. A movable plate is slidably provided on the wedge surface. The front end of the movable plate is located at the front end of the co-extrusion cavity, and an extrusion gap is formed between the front ends of the two movable plates. The extrusion gap is connected to the co-extrusion cavity. Moving the movable plate can change the size of the extrusion gap.

2. The adjustable extrusion die for producing plastic sealant as described in claim 1, characterized in that: The movable plate includes a slide plate and a baffle plate connected to each other. The slide plate is slidably connected to the wedge surface. The baffle plate is vertically arranged in front of the co-extrusion cavity. The extrusion gap is formed by the gap between the two baffle plates.

3. The adjustable extrusion die for producing plastic sealant as described in claim 2, characterized in that: The side of the baffle away from the slide plate and close to the co-extrusion cavity is designed with an arc surface structure.

4. The adjustable extrusion die for producing plastic sealant as described in claim 2, characterized in that: A seal is installed on the front end of the wedge surface.

5. The adjustable extrusion die for producing plastic sealant as described in claim 2, characterized in that: A fixing block is fixedly connected to the inclined wedge surface, and a sliding groove is formed on the surface of the slider, which slides in cooperation with the fixing block.

6. The adjustable extrusion die for producing plastic sealant as described in claim 5, characterized in that: A fixing plate is fixedly connected to the inclined wedge surface, and a connecting plate is fixedly connected to the sliding plate. A bolt is rotatably installed on the fixing plate, and the bolt passes through the fixing plate and is threadedly connected to the fixing plate.

7. The adjustable extrusion die for producing plastic sealant as described in claim 6, characterized in that: The end of the bolt is fixedly connected to an anti-slip knob.

8. The adjustable extrusion die for producing plastic sealant as described in claim 2, characterized in that: The wedge surface is provided with a scale, and the direction of the scale is the same as the sliding direction of the slide plate.

9. The adjustable extrusion die for producing plastic sealant as described in claim 1, characterized in that: A partition is fixedly provided between the upper and lower dies, and the front end of the partition extends into the co-extrusion cavity.

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