Multi-layer co-extrusion blow molding die head structure

Abstract

The utility model relates to the technical field of blow molding machines, in particular to a multi-layer co-extrusion blow molding die head structure. The mold comprises a mold body, a first mold ring, a second mold ring, a third mold ring and a fourth mold ring are fixed in the mold body from top to bottom, a first cavity is formed between the first mold ring and the second mold ring, a second cavity is formed between the second mold ring and the third mold ring, and a third cavity is formed between the third mold ring and the fourth mold ring. The first cavity, the second cavity and the third cavity correspond to the structural layer, the bonding layer and the blocking layer respectively, and a core mold rod is fixed in the mold body. According to the multi-layer co-extrusion blow molding die head structure provided by the utility model, the first feeding pipe, the second feeding pipe and the third feeding pipe are used for conveying corresponding raw materials of a barrier layer, a bonding layer and a structural layer to the first cavity, the second cavity and the third cavity; and the thicknesses of the blocking layer, the bonding layer and the structural layer can be conveniently adjusted through the first material plug ring, the second material plug ring and the third material plug ring.

Description

Technical Field

[0001] This utility model relates to the field of blow molding machine technology, and in particular to the structure of a multi-layer co-extrusion blow molding die. Background Technology

[0002] Multilayer co-extrusion blow molding technology is a process that combines different functional plastic materials (such as barrier layers, adhesive layers, and structural layers) in a die to form multilayer hollow products in a single step. This technology can take into account the requirements of material mechanical properties, barrier properties, and cost, and is widely used in the field of high value-added packaging.

[0003] When using the above technology, the following technical problems were found in the existing technology: In the process of compounding the barrier layer, adhesive layer and structural layer in the die head to form a multi-layer hollow product in one step, when it is necessary to adjust the thickness of the barrier layer, adhesive layer and structural layer, the die head needs to be disassembled. Although the layer thickness can be adjusted by replacing the flow divider die head, the disassembly and assembly process is cumbersome and requires machine downtime, which seriously affects production efficiency. Therefore, the thickness ratio of the barrier layer, adhesive layer and structural layer is determined before production and cannot be flexibly and quickly adjusted according to actual needs, resulting in poor product adaptability. To address this, we designed a multi-layer co-extrusion blow molding die head structure to provide an alternative technical solution to the above technical problems. Utility Model Content

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A multi-layer co-extrusion blow molding die head structure includes a die body. Inside the die body, from top to bottom, are fixed a first die ring, a second die ring, a third die ring, and a fourth die ring. A first cavity is formed between the first die ring and the second die ring, a second cavity is formed between the second die ring and the third die ring, and a third cavity is formed between the third die ring and the fourth die ring. The first cavity, the second cavity, and the third cavity correspond to a structural layer, an adhesive layer, and a barrier layer, respectively. A core die rod is fixed inside the die body. A first feed pipe, a second feed pipe, and a third feed pipe are fixed to the outer sides of the first cavity, the second cavity, and the third cavity, respectively.

[0006] As a preferred embodiment of the multi-layer co-extrusion blow molding die head structure provided by this utility model, a first material plug ring is slidably connected to the outer side of the core die rod and located between the first die ring and the second die ring. The first material plug ring is used to adjust the thickness of the structural layer of the first cavity.

[0007] In a preferred embodiment of the multi-layer co-extrusion blow molding die head structure provided by this utility model, a second material plug ring is slidably connected to the outside of the second die ring and between the second die ring and the third die ring. The second material plug ring is used to adjust the thickness of the adhesive layer in the second cavity.

[0008] As a preferred embodiment of the multi-layer co-extrusion blow molding die head structure provided by this utility model, a third material plug ring is slidably connected to the outside of the third die ring and between the third die ring and the fourth die ring. The third material plug ring is used to adjust the thickness of the barrier layer of the third cavity.

[0009] In a preferred embodiment of the multi-layer co-extrusion blow molding die head structure provided by this utility model, the inner side of the first material plug ring is slidably connected to the core die rod, the inner side of the second material plug ring is slidably connected to the second die ring and the core die rod, and the inner side of the third material plug ring is slidably connected to the third die ring, the second die ring and the core die rod.

[0010] In a preferred embodiment of the multi-layer co-extrusion blow molding die head structure provided by this utility model, the bottom end between the first die ring and the second die ring is the first cavity outlet, the bottom end between the second die ring and the third die ring is the second cavity outlet, and the bottom end between the third die ring and the fourth die ring is the third cavity outlet.

[0011] In a preferred embodiment of the multi-layer co-extrusion blow molding die head structure provided by this utility model, the core die rod is provided with a transmission mechanism for adjusting the first, second, and third material plug rings. The transmission mechanism includes a first, second, and third thickness adjustment piston rod. The third thickness adjustment piston rod is rotatably connected to the inner side of the core die rod. The bottom end of the outer side of the third thickness adjustment piston rod is threadedly connected to the third material plug ring. The second thickness adjustment piston rod is rotatably connected to the outer side of the third thickness adjustment piston rod. The bottom end of the outer side of the second thickness adjustment piston rod is threadedly connected to the second material plug ring. The first thickness adjustment piston rod is rotatably connected to the outer side of the second thickness adjustment piston rod. The bottom end of the outer side of the first thickness adjustment piston rod is threadedly connected to the first material plug ring. The outer side of the first thickness adjustment piston rod is rotatably connected to the core die rod.

[0012] It is clear without a doubt that the technical solution described above in this application can solve the technical problem that this application aims to address.

[0013] At the same time, through the above technical solutions, this utility model has at least the following beneficial effects:

[0014] The multi-layer co-extrusion blow molding die head structure provided by this utility model effectively controls the melt flow rate at the outlet of the third cavity by rotating the third thickness-adjusting piston rod, which drives the first material plug ring between the third and fourth die rings, and the third material plug ring is slidably connected to the third die ring, the second die ring, and the core die rod. At this time, the thickness of the barrier layer is precisely controlled. Then, rotating the second thickness-adjusting piston rod drives the second material plug ring between the second and third die rings, and the second material plug ring is slidably connected to the second die ring and the core die rod, which effectively controls the melt flow rate at the outlet of the second cavity, and the thickness of the adhesive layer is precisely controlled. Finally, rotating the first thickness-adjusting piston rod drives the first material plug ring between the first and second die rings, and the first material plug ring is slidably connected to the core die rod, which effectively controls the melt flow rate at the outlet of the first cavity, and the thickness of the structural layer is precisely controlled. This structure can be used to independently adjust the melt flow rate of each functional layer, thereby achieving precise control of the thickness of each layer. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the internal structure of the mold of this utility model;

[0018] Figure 3 This is a schematic diagram of the structure between the second, third, and fourth mold rings of this utility model;

[0019] Figure 4 This is a schematic diagram of the structure between the first, second, and third plug rings of this utility model;

[0020] Figure 5 This is a schematic diagram of the structure between the first, second, and third thickness-adjusting piston rods of this utility model.

[0021] In the diagram: 1. Mold body; 2. First feed pipe; 3. Second feed pipe; 4. Third feed pipe; 5. First mold ring; 6. Core mold rod; 7. Second mold ring; 8. Third mold ring; 9. Fourth mold ring; 10. First thickness adjustment piston rod; 11. Second thickness adjustment piston rod; 12. Third thickness adjustment piston rod; 13. First material plug ring; 14. Second material plug ring; 15. Third material plug ring. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0023] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0024] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] Example 1

[0027] Please refer to Figures 1-5 A multi-layer co-extrusion blow molding die head structure includes a die body 1. Inside the die body 1, from top to bottom, are fixed a first die ring 5, a second die ring 7, a third die ring 8, and a fourth die ring 9. A first cavity is formed between the first die ring 5 and the second die ring 7, a second cavity is formed between the second die ring 7 and the third die ring 8, and a third cavity is formed between the third die ring 8 and the fourth die ring 9. The first cavity, the second cavity, and the third cavity correspond to the structural layer, the adhesive layer, and the barrier layer, respectively. A core die rod 6 is fixed inside the die body 1. A first feed pipe 2, a second feed pipe 3, and a third feed pipe 4 are fixed outside the first cavity, the second cavity, and the third cavity, respectively.

[0028] In use, the first feed pipe 2, the second feed pipe 3, and the third feed pipe 4 deliver the corresponding barrier layer, adhesive layer, and structural layer raw materials to the first cavity, the second cavity, and the third cavity, respectively. Then, the first material plug ring 13, the second material plug ring 14, and the third material plug ring 15 facilitate the thickness adjustment of the barrier layer, adhesive layer, and structural layer, which can be used to independently adjust the melt flow rate of each functional layer, thereby achieving precise control of the thickness of each layer. In addition, the thickness ratio of the barrier layer, adhesive layer, and structural layer can be adjusted without changing the die head, thus greatly improving the practicality and flexibility of the die head.

[0029] A first material plug ring 13 is slidably connected to the outside of the core mold rod 6 and between the first mold ring 5 and the second mold ring 7. The first material plug ring 13 is used to adjust the thickness of the structural layer of the first cavity to ensure the stable extrusion of the structural layer material.

[0030] A second material plug ring 14 is slidably connected to the outside of the second mold ring 7 and between the second mold ring 7 and the third mold ring 8. The second material plug ring 14 is used to adjust the thickness of the adhesive layer in the second cavity, so as to realize the controllable output of the adhesive layer material.

[0031] A third material plug ring 15 is slidably connected to the outside of the third mold ring 8 and between the third mold ring 8 and the fourth mold ring 9. The third material plug ring 15 is used to adjust the thickness of the barrier layer in the third cavity and is specifically used for the precise extrusion of the barrier layer material.

[0032] The inner side of the first plug ring 13 is slidably connected to the core mold rod 6, the inner side of the second plug ring 14 is slidably connected to the second mold ring 7 and the core mold rod 6, and the inner side of the third plug ring 15 is slidably connected to the third mold ring 8, the second mold ring 7 and the core mold rod 6.

[0033] The bottom end between the first mold ring 5 and the second mold ring 7 is the first cavity outlet, the bottom end between the second mold ring 7 and the third mold ring 8 is the second cavity outlet, and the bottom end between the third mold ring 8 and the fourth mold ring 9 is the third cavity outlet. The structural layer, adhesive layer and barrier layer are effectively composited through the first cavity outlet, the second cavity outlet and the third cavity outlet.

[0034] The core mold rod 6 is internally equipped with a transmission mechanism for adjusting the first material plug ring 13, the second material plug ring 14, and the third material plug ring 15. The transmission mechanism includes a first thickness adjusting piston rod 10, a second thickness adjusting piston rod 11, and a third thickness adjusting piston rod 12. The third thickness adjusting piston rod 12 is rotatably connected to the inner side of the core mold rod 6. The bottom end of the outer side of the third thickness adjusting piston rod 12 is threadedly connected to the third material plug ring 15. The second thickness adjusting piston rod 11 is rotatably connected to the outer side of the third thickness adjusting piston rod 12. The bottom end of the outer side of the second thickness adjusting piston rod 11 is threadedly connected to the second material plug ring 14. The first thickness adjusting piston rod 10 is rotatably connected to the outer side of the second thickness adjusting piston rod 11. The bottom end of the outer side of the first thickness adjusting piston rod 10 is threadedly connected to the first material plug ring 13. The outer side of the first thickness adjusting piston rod 10 is rotatably connected to the core mold rod 6.

[0035] Specifically, by rotating the third thickness-adjusting piston rod 12, the first material plug ring 13 is driven between the third mold ring 8 and the fourth mold ring 9, and the third material plug ring 15 is slidably connected to the third mold ring 8, the second mold ring 7 and the core mold rod 6, effectively controlling the melt flow at the outlet of the third cavity. At this time, the thickness of the barrier layer is effectively and precisely controlled. Then, by rotating the second thickness-adjusting piston rod 11, the second material plug ring 14 is driven between the second mold ring 7 and the third mold ring 8, and the second material plug ring 14 is slidably connected to the second mold ring 7 and the core mold rod 6, effectively controlling the melt flow at the outlet of the second cavity. At this time, the thickness of the adhesive layer is effectively and precisely controlled. Finally, by rotating the first thickness-adjusting piston rod 10, the first material plug ring 13 is driven between the first mold ring 5 and the second mold ring 7, and the first material plug ring 13 is slidably connected to the core mold rod 6, effectively controlling the melt flow at the outlet of the first cavity. At this time, the thickness of the structural layer is effectively and precisely controlled. This can be used to independently adjust the melt flow of each functional layer, thereby achieving precise control of the thickness of each layer.

[0036] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the present utility model to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A multi-layer co-extrusion blow molding die structure characterized by, The utility model relates to a kind of moulding die, including die (1), the inside of the die (1) is fixed with first mould ring (5), second mould ring (7), third mould ring (8) and fourth mould ring (9) from top to bottom, first cavity is formed between the first mould ring (5) and second mould ring (7), second cavity is formed between the second mould ring (7) and third mould ring (8), third cavity is formed between the third mould ring (8) and fourth mould ring (9), the first cavity, second cavity and third cavity correspond structure layer, adhesive layer and barrier layer respectively, the inside of the die (1) is fixed with core mould rod (6), the outside of the first cavity, second cavity and third cavity is fixed with first feeding pipe (2), second feeding pipe (3) and third feeding pipe (4) respectively.

2. The multi-layer co-extrusion blow molding die structure of claim 1, wherein, The outside of the core mould rod (6) and between the first mould ring (5) and second mould ring (7) slidingly connected with first plug ring (13), the first plug ring (13) is used to adjust the thickness of the structure layer of first cavity.

3. The multi-layer co-extrusion blow molding die structure of claim 2, wherein, The outside of the second mould ring (7) and between the second mould ring (7) and third mould ring (8) slidingly connected with second plug ring (14), the second plug ring (14) is used to adjust the thickness of the adhesive layer of second cavity.

4. The multi-layer co-extrusion blow molding die structure of claim 3, wherein, The outside of the third mould ring (8) and between the third mould ring (8) and fourth mould ring (9) slidingly connected with third plug ring (15), the third plug ring (15) is used to adjust the thickness of the barrier layer of third cavity.

5. The multi-layer co-extrusion blow molding die structure of claim 4, wherein, The inside of the first plug ring (13) is slidingly connected with core mould rod (6), the inside of the second plug ring (14) is slidingly connected with second mould ring (7) and core mould rod (6), the inside of the third plug ring (15) is slidingly connected with third mould ring (8), second mould ring (7) and core mould rod (6).

6. The multi-layer co-extrusion blown molding die structure according to claim 5, wherein, The bottom end between the first mould ring (5) and second mould ring (7) is first cavity discharge port, the bottom end between the second mould ring (7) and third mould ring (8) is second cavity discharge port, the bottom end between the third mould ring (8) and fourth mould ring (9) is third cavity discharge port.

7. The multi-layer co-extrusion blow molding die structure of claim 2, wherein, The inside of the core mould rod (6) is provided with transmission mechanism for adjusting first plug ring (13), second plug ring (14) and third plug ring (15), the transmission mechanism includes first thickness adjusting piston rod (10), second thickness adjusting piston rod (11) and third thickness adjusting piston rod (12), the inside of the core mould rod (6) is rotatably connected with third thickness adjusting piston rod (12), the bottom end of the outside of the third thickness adjusting piston rod (12) is threadedly connected with third plug ring (15), the outside of the third thickness adjusting piston rod (12) is rotatably connected with second thickness adjusting piston rod (11), the bottom end of the outside of the second thickness adjusting piston rod (11) is threadedly connected with second plug ring (14), the outside of the second thickness adjusting piston rod (11) is rotatably connected with first thickness adjusting piston rod (10), the bottom end of the outside of the first thickness adjusting piston rod (10) is threadedly connected with first plug ring (13), the outside of the first thickness adjusting piston rod (10) is rotatably connected with core mould rod (6).

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