Multilayer coextrusion die for producing nine-layer coextruded nylon film

Abstract

The utility model relates to nylon film production technical field, and disclose a kind of multilayer coextrusion die head for nine-layer coextrusion nylon film production, including base, the upper surface of base is fixedly installed with die head, the inner wall of die head is fixedly installed with inner block, the top of inner block is equipped with discharge port, the inside of die head is provided with the mixing feed assembly for premixing to multiple input materials, the mixing feed assembly includes the feed pipe of fixed installation in the outer wall of die head.The multilayer coextrusion die head for nine-layer coextrusion nylon film production, through the backflow pipe of multiple groups of oblique shape arrangement, to make the interactive effect of promoting molten material between adjacent two groups of arc-shaped pipeline, the backflow pipe of the intercommunication between multiple groups of arc-shaped pipeline up and down, so that the molten material in whole input die head can be premixed, can obtain good mixing effect before inputting inner block and extruding outward, avoid multiple molten material uneven distribution, affect the problem of nylon film production quality.

Description

Technical Field

[0001] This utility model relates to the field of nylon film production technology, specifically a multi-layer co-extrusion die head for producing nine-layer co-extruded nylon film. Background Technology

[0002] Nylon film is generally produced by blown film equipment using blown film technology. There are two main types of dies for multi-layer co-extrusion blown film machines used for producing plastic films: the first type is the planar superimposed multi-layer co-extrusion blown film die head, and the second type is the concentric sleeve multi-layer co-extrusion blown film die head.

[0003] According to a published application for a multi-layer co-extrusion die for biodegradable mulch film (announcement number: CN222135892U), the above application can reduce the flow rate of other molten plastic materials to increase the proportion of a certain molten plastic material, which has the functions of easy control and convenient adjustment, and avoids the situation where too much of a certain molten plastic material causes a reduction in the quality of the finished product.

[0004] However, in actual use, although some of the molten materials in the input die enter the vertical channel for mixing, this mixed molten material separates from the original input material upon separation. Even if this part of the material is mixed relatively evenly, it still cannot change the problem that the overall material is relatively independent and the mixing effect is poor. As a result, the quality of the product is uneven when multiple molten materials are extruded together, which affects the production quality of the equipment. To address this, we propose a multi-layer co-extrusion die for the production of nine-layer co-extruded nylon film. Utility Model Content

[0005] The purpose of this invention is to provide a multilayer co-extrusion die for the production of nine-layer co-extruded nylon film, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a multilayer co-extrusion die head for producing nine-layer co-extruded nylon film, comprising a base, a die head fixedly mounted on the upper surface of the base, an inner baffle fixedly mounted on the inner wall of the die head, a discharge port opened at the top of the inner baffle, a mixing and feeding assembly for premixing multiple input materials arranged inside the die head, the mixing and feeding assembly including a feeding pipe fixedly mounted on the outer wall of the die head, an arc-shaped pipe fixedly mounted on the inner wall of the die head, a bend fixedly mounted at the end of the arc-shaped pipe, a slanted baffle fixedly mounted on the inner wall of the bend away from the arc-shaped pipe, and a return pipe fixedly mounted on the outer wall of the arc-shaped pipe.

[0007] Preferably, the inner baffle is located at the center of the mold head, and the inner baffle is hollow.

[0008] Preferably, the number of arc-shaped pipes is set in multiple groups, and the multiple groups of arc-shaped pipes are distributed at equal intervals in the vertical direction inside the die head. The arc-shaped pipes are fixedly connected to the feed pipes, and the feed pipes corresponding to two adjacent groups of arc-shaped pipes face opposite directions.

[0009] Preferably, the number of bends is set in two sets, one set of bends with inclined blocks at the ends on the top inner wall, and the other set of bends with inclined blocks at the ends on the bottom inner wall.

[0010] Preferably, the return pipe is inclined, and both ends of the return pipe are fixedly connected to the outer walls of two adjacent sets of arc-shaped pipes, and the return pipe and the inner cavity of the arc-shaped pipes are interconnected.

[0011] Preferably, the inner wall of the inner baffle has a mixing cavity, a through hole is formed between the bottom inner wall of the mixing cavity and the central cavity of the inner baffle, a spiral belt is fixedly installed on the inner surface of the mixing cavity, and an arc-shaped belt is fixedly installed on the inner wall of the mixing cavity.

[0012] Preferably, the arc-shaped band is disposed at the gap of the spiral band, and the width of both the arc-shaped band and the spiral band is smaller than the width of the mixing chamber.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: through the cooperation of arc-shaped pipes, bends, inclined blocks, return pipes, mixing chambers, through holes, spiral belts, and arc-shaped belts, the external molten material is input through the feed pipe and flows along the arc-shaped pipe during the extrusion process. Through multiple sets of inclined return pipes, the interaction effect of molten material between adjacent sets of arc-shaped pipes is improved. Through the connection of return pipes between multiple sets of upper and lower arc-shaped pipes, the molten material in the entire input die head can be pre-mixed, and a good mixing effect can be obtained before inputting to the inner baffle and extruding outwards, avoiding the problem of uneven distribution of various molten materials, which affects the production quality of nylon film. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0016] Figure 3 This is a schematic diagram of the arc-shaped pipe structure of this utility model;

[0017] Figure 4 This utility model Figure 3 Enlarged view of region A in the middle;

[0018] Figure 5 This is a schematic cross-sectional view of the inner baffle structure of this utility model.

[0019] The components represented by each number in the attached diagram are listed below: 1. Base; 2. Die head; 3. Inner baffle; 4. Outlet; 5. Feed pipe; 6. Arc-shaped pipe; 7. Bend; 8. Inclined baffle; 9. Return pipe; 10. Mixing chamber; 11. Through hole; 12. Spiral belt; 13. Arc-shaped belt. Detailed Implementation

[0020] 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.

[0021] Please see Figures 1-5 The figure shows a multilayer co-extrusion die head for producing nine-layer co-extruded nylon film, including a base 1, a die head 2 fixedly mounted on the upper surface of the base 1, an inner baffle 3 fixedly mounted on the inner wall of the die head 2, a discharge port 4 opened at the top of the inner baffle 3, a mixing feed assembly for premixing multiple input materials is provided inside the die head 2, the mixing feed assembly includes a feed pipe 5 fixedly mounted on the outer wall of the die head 2, an arc-shaped pipe 6 fixedly mounted on the inner wall of the die head 2, a bend 7 fixedly mounted at the end of the arc-shaped pipe 6, a slanted baffle 8 fixedly mounted on the inner wall of the bend 7 away from the arc-shaped pipe 6, and a return pipe 9 fixedly mounted on the outer wall of the arc-shaped pipe 6.

[0022] Please see Figure 1 , Figure 2 The device is equipped with a base 1 to facilitate installation on the extruder. The feed pipe 5 and the arc-shaped pipe 6 are connected in a continuous manner. In actual use, the feed pipe 5 is connected to the external output pipe of the molten material so that the molten material is input into the die head 2 through the feed pipe 5.

[0023] The inner baffle 3 is located at the center of the mold head 2, and the inner baffle 3 is hollow.

[0024] Please see Figure 2 , Figure 5 The inner baffle 3 isolates the center of the die head 2, and through the cavity in the center of the inner baffle 3, the molten material input into the die head 2 can be mixed and finally discharged outward through the discharge port 4 at its top. Specifically, there are multiple sets of discharge ports 4, which are evenly distributed on the top inner wall of the inner baffle 3 to ensure the discharge speed of the device.

[0025] The number of arc-shaped pipes 6 is set in multiple groups. The multiple groups of arc-shaped pipes 6 are distributed at equal intervals in the vertical direction inside the die head 2. The arc-shaped pipes 6 are fixedly connected to the feed pipes 5, and the feed pipes 5 corresponding to two adjacent groups of arc-shaped pipes 6 face opposite directions.

[0026] Please see Figure 2 , Figure 3 The arrangement of multiple sets of arc-shaped pipes 6 allows for the simultaneous input of various molten materials into the die head 2 for mixing, thereby improving the production quality of the nylon film. Furthermore, the input of special raw materials can modify the nylon film and enhance its performance in certain aspects. Simultaneously, the opposite orientation of adjacent sets of arc-shaped pipes 6 ensures that the bends 7 at the ends of the arc-shaped pipes 6 are also positioned oppositely. This results in more distribution points for the molten materials input through the bends 7 at different heights of the inner baffle 3, thus avoiding the problem of poor mixing and dispersion caused by concentrated material input.

[0027] There are two sets of bends 7. One set of bends 7 has inclined blocks 8 at the ends on the top inner wall, and the other set of bends 7 has inclined blocks 8 at the ends on the bottom inner wall.

[0028] Please see Figure 3 , Figure 4 Because the two sets of bends 7 at the ends of the same set of arc pipes 6 are affected by the inclined blocks 8 installed at different positions when discharging, the molten material entering the inner baffle 3 through the bends 7 will be output in two directions, upward and downward, which further improves the mixing effect of the molten material in the inner baffle 3, ensures the mixing effect when multiple types of raw materials are input, and avoids the problem of uneven quality of nylon film products.

[0029] The return pipe 9 is set at an angle, and both ends of the return pipe 9 are fixedly connected to the outer walls of two adjacent sets of arc-shaped pipes 6, and the return pipe 9 and the inner cavity of the arc-shaped pipes 6 are interconnected.

[0030] Please see Figure 3 The number of return pipes 9 is set to a certain extent, and the return pipes 9 are evenly distributed between two adjacent sets of arc pipes 6. The inclination direction of the two adjacent return pipes 9 is opposite, thereby improving the interaction effect of the molten material between the two adjacent sets of arc pipes 6. Through the connection of the return pipes 9 between the upper and lower sets of arc pipes 6, the molten material in the entire input system can be premixed, and a good mixing effect can be obtained before the inner baffle 3 is input and extruded outward, avoiding the problem of uneven distribution of various molten materials affecting the production quality of nylon film.

[0031] The inner wall of the inner baffle 3 is provided with a mixing chamber 10. A through hole 11 is provided between the bottom inner wall of the mixing chamber 10 and the central cavity of the inner baffle 3. A spiral belt 12 is fixedly installed on the inner surface of the mixing chamber 10, and an arc-shaped belt 13 is fixedly installed on the inner wall of the mixing chamber 10.

[0032] Please see Figure 5 Multiple sets of through holes 11 are arranged in a circumferential array at the bottom of the mixing chamber 10. The bottom surface of the through holes 11 is flush with the bottom surface of the mixing chamber 10 to ensure that the molten material in the mixing chamber 10 can be effectively discharged and reduce residue. In addition, multiple sets of arc-shaped bands 13 are arranged in a spiral array on the inner surface of the mixing chamber 10 to disperse the molten material flowing downward along the spiral band 12 and further improve its mixing effect.

[0033] The arc-shaped belt 13 is positioned at the gap of the spiral belt 12, and the widths of both the arc-shaped belt 13 and the spiral belt 12 are smaller than the width of the mixing chamber 10.

[0034] Please see Figure 5 The arc-shaped belt 13 and the spiral belt 12 can guide the molten material entering the mixing chamber 10 to flow downward in a spiral shape and promote further dispersion and mixing. The gap between the sides of the arc-shaped belt 13 and the spiral belt 12 and the inner wall of the mixing chamber 10 ensures that the molten material is not completely blocked, thus ensuring the efficiency of the discharge of the molten material in the inner baffle 3.

[0035] Working principle: The base 1 is installed on the output device of the extruder, and multiple sets of feed pipes 5 are connected to the molten material input pipes respectively. The molten material enters the arc-shaped pipe 6 through the input and flows along the arc-shaped pipe 6 towards the bend 7. Finally, it enters the mixing chamber 10 in the inner baffle 3 at an inclined position through the inclined baffle 8 at the end of the bend 7. During this process, multiple sets of inclined return pipes 9 are used to improve the interaction effect of the molten material between adjacent sets of arc-shaped pipes 6. Through the connection of the return pipes 9 between the upper and lower sets of arc-shaped pipes 6, the molten material in the entire input die head 2 can be pre-mixed. Before entering the inner baffle 3 and extruding outward, a good mixing effect can be obtained, avoiding the problem of uneven distribution of various molten materials, which affects the production quality of nylon film.

[0036] It should also 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 a process, method, article, or apparatus.

[0037] 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 multilayer co-extrusion die head for producing nine-layer co-extruded nylon film, comprising a base (1), wherein a die head (2) is fixedly mounted on the upper surface of the base (1), characterized in that: The inner wall of the die head (2) is fixedly installed with an inner baffle (3), and the top of the inner baffle (3) is provided with a discharge port (4). The inside of the die head (2) is provided with a mixing feed assembly for premixing various input materials. The mixing feed assembly includes a feed pipe (5) fixedly installed on the outer wall of the die head (2). The inner wall of the die head (2) is fixedly installed with an arc-shaped pipe (6). The end of the arc-shaped pipe (6) is fixedly installed with a bend (7). The inner wall of the bend (7) away from the arc-shaped pipe (6) is fixedly installed with a slanted block (8). The outer wall of the arc-shaped pipe (6) is fixedly installed with a return pipe (9).

2. The multilayer co-extrusion die head for producing nine-layer co-extruded nylon film according to claim 1, characterized in that: The inner baffle (3) is located at the center of the mold head (2), and the inner baffle (3) is hollow.

3. The multilayer co-extrusion die for producing a nine-layer co-extruded nylon film according to claim 1, characterized in that: The number of the arc-shaped pipes (6) is set in multiple groups. The multiple groups of arc-shaped pipes (6) are distributed at equal distances in the vertical direction inside the mold head (2). The arc-shaped pipes (6) are fixedly connected to the feed pipes (5). The feed pipes (5) corresponding to two adjacent groups of arc-shaped pipes (6) face opposite directions.

4. The multilayer co-extrusion die for producing a nine-layer co-extruded nylon film according to claim 1, characterized in that: The number of the bends (7) is set in two sets. One set of bends (7) has inclined blocks (8) at the end on the top inner wall, and the other set of bends (7) has inclined blocks (8) at the end on the bottom inner wall.

5. The multilayer co-extrusion die for producing a nine-layer co-extruded nylon film according to claim 3, characterized in that: The return pipe (9) is set at an inclination, and the two ends of the return pipe (9) are fixedly connected to the outer walls of two adjacent sets of arc pipes (6), and the return pipe (9) and the inner cavity of the arc pipe (6) are interconnected.

6. The multilayer co-extrusion die for producing a nine-layer co-extruded nylon film according to claim 2, characterized in that: The inner wall of the inner baffle (3) is provided with a mixing cavity (10), and a through hole (11) is provided between the bottom inner wall of the mixing cavity (10) and the central cavity of the inner baffle (3). A spiral band (12) is fixedly installed on the inner surface of the mixing cavity (10), and an arc band (13) is fixedly installed on the inner wall of the mixing cavity (10).

7. The multilayer co-extrusion die for producing a nine-layer co-extruded nylon film according to claim 6, characterized in that: The arc-shaped band (13) is positioned at the gap of the spiral band (12), and the widths of both the arc-shaped band (13) and the spiral band (12) are smaller than the width of the mixing chamber (10).

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