Choke Mixing Die

Abstract

The present invention relates to the field of membrane processing and production technology, specifically to a flow-blocking mixing and pressure-digging die. The flow-blocking mixing and pressure-digging die comprises a central nested layer, a single-layer outer nested layer is arranged on the outer side of the central nested layer, a lateral feed port is arranged on the central nested layer, a pressure relief ring and a flow-blocking layer are arranged in the vertical direction on the outer side of the central nested layer, and the inner side of the single-layer outer nested layer is smooth, and a gap is arranged between the single-layer outer nested layer and the central nested layer for the circulation of raw materials. The present invention uses a pressure relief ring, a flow-blocking layer, and a lateral feed port in coordination, so that the molten raw material enters through the lateral feed port, and then the flow velocity slows down at the pressure relief ring, so that the molten raw material is in a horizontal state, and rises synchronously in the flow-blocking layer, and then passes through multiple pressure relief rings, which greatly reduces the bubbles in the molten raw material, avoids the generation of surface holes and flow lines during geomembrane extrusion, and improves product quality.

Description

Technical Field

[0001] The invention relates to the technical field of film processing and production, in particular to a flow-blocking mixing and compression die head. Background Art

[0002] In the production process of geomembrane, the role of the die runs through the entire production process. First, the raw material is fed into the die through a heated screw, and heated and melted into a melt in the die. Subsequently, the melt is extruded from the die under pressure and forms a cylindrical film bubble at the position of the die. In this process, the shape and size of the die determine the initial shape and size of the film bubble. Then, the film bubble is blown upward and stretched and cooled by compressed air to form a geomembrane. In this process, the cooling system and adjustment device of the die play a key role, ensuring that the geomembrane can be quickly cooled and shaped and maintain stable size and performance.

[0003] The main function of the die is to extrude the molten plastic raw material through the extruder, and then form a geomembrane product with specific width, thickness and performance after precise control and cooling by the die. In workshop production, the existing die has uneven melt extrusion, which leads to holes, bubbles and flow lines on the surface of the geomembrane, seriously affecting the product quality.

[0004] Chinese patent application CN106182680A, published on December 7, 2016, discloses a blow molding die head, including a core rod, a core rod sleeve arranged outside the core rod; a departure angle is formed between the core rod and the core rod sleeve; a plurality of flow channels are arranged on the core rod; the flow channel inlet is connected to the die head feed port, and the outlet is connected to the departure angle; and a plurality of reverse flow channels are arranged to intersect with the flow channel. Although the flow channel is designed into two opposite positive and negative structures to reduce the generation of dead angles, it does not solve the problem of holes and bubbles on the surface of the geomembrane. Summary of the invention

[0005] In view of the deficiencies in the above prior art, the purpose of the present invention is to provide a flow-blocking mixing pressure die head, through the coordinated use of a pressure relief ring, a flow-blocking layer, and a side feed port, the molten raw material enters through the side feed port, and then the flow velocity slows down at the pressure relief ring, so that the molten raw material is in a horizontal state, and then rises synchronously in the flow-blocking layer, and then passes through multiple pressure relief rings, which greatly reduces the bubbles in the molten raw material, avoids the formation of surface holes and flow lines during geomembrane extrusion, and improves product quality; through the arrangement of a primary nested layer, a secondary nested layer, and a multi-layer outer nested layer, a multi-layer geomembrane can be produced.

[0006] The present invention is achieved by adopting the following technical solutions:

[0007] The choke mixing die head comprises a central nested layer, a single-layer outer nested layer is arranged on the outer side of the central nested layer, a lateral feed port is arranged on the central nested layer, a pressure relief ring and a choke layer are arranged in the vertical direction on the outer side of the central nested layer, the inner side of the single-layer outer nested layer is smooth, and a gap is arranged between the single-layer outer nested layer and the central nested layer for the circulation of raw materials.

[0008] The die head is cylindrical in shape as a whole and is equipped with a heat preservation device inside.

[0009] The side feed port 1 is located in the horizontal direction. The raw materials out of the side feed port 1 first enter the pressure relief ring, and then pass through the flow-blocking layer and the pressure relief ring at intervals upward. There are multiple pressure relief rings and flow-blocking layers, and a discharge port is provided above the gap.

[0010] The flow-blocking mixing and compression die head also comprises a primary nesting layer, a secondary nesting layer and a multi-layer outer nesting layer, and is used for producing a multi-layer plastic film.

[0011] The first-level nesting layer is located outside the central nesting layer, the second-level nesting layer is located outside the first-level nesting layer, and the multi-layer outer nesting layer is located outside the second-level nesting layer.

[0012] The connection mode of the primary nesting layer and the central nesting layer is the same as the connection mode of the single outer nesting layer and the central nesting layer.

[0013] A gap is provided between the secondary nested layer and the primary nested layer for the circulation of raw materials. A pressure relief ring and a flow blocking layer are provided in the vertical direction on one side of the primary nested layer close to the secondary nested layer. The upper part of the flow blocking layer is connected to the gap between the primary nested layer and the central nested layer through a secondary oblique flow channel.

[0014] The connection mode of the multi-layer outer nesting layer and the secondary nesting layer is the same as the connection mode of the secondary nesting layer and the primary nesting layer.

[0015] The gap between the multi-layer outer nesting layer and the secondary nesting layer is connected to the gap between the primary nesting layer and the central nesting layer through a three-level oblique flow channel.

[0016] The first-level nesting layer is provided with a second lateral feed port, and the second lateral feed port is connected to a pressure relief ring on the gap between the first-level nesting layer and the second-level nesting layer.

[0017] The secondary nesting layer is provided with a lateral feed port three, and the lateral feed port three is connected to a pressure relief ring on the gap between the multi-layer outer nesting layer and the secondary nesting layer.

[0018] The cross sections of the side feed port and the pressure relief ring are both circular.

[0019] The pressure relief ring is semi-annular, and its plane position is connected with the primary longitudinal flow channel. The longitudinal cross-sectional diameter of the pressure relief ring is 2-3 times the longitudinal cross-sectional diameter of the flow-blocking layer.

[0020] The number of nested layers can be 1-9, and the number of corresponding side feed ports can also be 1-9.

[0021] The flow-blocking mixing and compression die head can be used for the production of geomembranes, and can produce geomembranes with 1 to 9 layers.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The flow-blocking mixing die head of the present invention cooperates with a pressure relief ring, a flow-blocking layer and a side feed port. The molten raw material enters through the side feed port and then the flow velocity slows down at the pressure relief ring, so that the molten raw material is in a horizontal state and rises synchronously in the flow-blocking layer and then passes through a plurality of pressure relief rings, thereby greatly reducing bubbles in the molten raw material and avoiding the generation of surface holes and flow path lines during geomembrane extrusion, thereby improving product quality. By setting a primary nested layer, a secondary nested layer and a multi-layer outer nested layer, multi-layer geomembrane can be produced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a cross-sectional view of a single-layer flow-blocking mixed-pressure die head of the present invention;

[0025] Figure 2 It is a front view of the flow-blocking mixing and compression die head of the present invention;

[0026] Figure 3 It is a cross-sectional view of the multi-layer flow-blocking mixed-pressure die head of the present invention;

[0027] Figure 4 It is a schematic structural diagram of the flow-blocking mixing and compression die head of the present invention;

[0028] Figure 5 It is a schematic diagram of the structure of the pressure relief ring and the flow-blocking layer of the present invention;

[0029] In the figure: 1. central nested layer; 2. pressure relief ring; 3. flow-blocking layer; 4. lateral feed port 1; 5. lateral feed port 2; 6. lateral feed port 3; 7. discharge port; 8. primary nested layer; 9. secondary oblique flow channel; 10. tertiary oblique flow channel; 11. secondary nested layer; 12. multi-layer outer nested layer; 13. single-layer outer nested layer. DETAILED DESCRIPTION

[0030] In order to make the purpose and technical solution of the present invention more clear, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0031] Example 1

[0032] like Figure 1As shown, the flow-blocking mixed pressure die head includes a central nested layer 1, a single-layer outer nested layer 13 is arranged outside the central nested layer 1, a lateral feed port 4 is arranged on the central nested layer 1, a pressure relief ring 2 and a flow-blocking layer 3 are arranged in a vertical direction outside the central nested layer 1, and the inner side of the single-layer outer nested layer 13 is smooth, and a gap is arranged between the central nested layer 1 and the central nested layer 1 for the circulation of raw materials. The lateral feed port 4 is located in the horizontal direction, and the raw materials exiting the lateral feed port 4 first enter the pressure relief ring 2, and then pass through the flow-blocking layer 3 and the pressure relief ring 2 upward at intervals. The number of the pressure relief ring 2 and the flow-blocking layer 3 is multiple, and a discharge port 7 is arranged above the gap.

[0033] Example 2

[0034] like Figure 2-5 As shown, the flow-blocking mixed pressure die head includes a central nested layer 1, a primary nested layer 8 is arranged outside the central nested layer 1, a secondary nested layer 11 is located outside the primary nested layer 8, and a multi-layer outer nested layer 12 is located outside the secondary nested layer 11. A lateral feed port 14 is arranged on the central nested layer 1, and a pressure relief ring 2 and a flow-blocking layer 3 are arranged in the vertical direction outside the central nested layer 1. The inner side of the primary nested layer 8 is smooth, and a gap is arranged between the primary nested layer 8 and the central nested layer 1 for the circulation of raw materials. The connection mode of the primary nested layer 8 and the central nested layer 1 is the same as the connection mode of the single-layer outer nested layer 13 and the central nested layer 1. A gap is arranged between the secondary nested layer 11 and the primary nested layer 8 for the circulation of raw materials. A pressure relief ring 2 and a flow-blocking layer 3 are arranged in the vertical direction on one side of the primary nested layer 8 close to the secondary nested layer 11, and the upper part of the flow-blocking layer 3 is connected to the gap between the primary nested layer 8 and the central nested layer 1 through a secondary oblique flow channel 9. The connection mode of the multi-layer outer nested layer 12 and the secondary nested layer 11 is the same as the connection mode of the secondary nested layer 11 and the primary nested layer 8. The gap between the multi-layer outer nested layer 12 and the secondary nested layer 11 is connected to the gap between the primary nested layer 8 and the central nested layer 1 through the third-level oblique flow channel 10. The primary nested layer 8 is provided with a lateral feed port 2 5, which is connected to the pressure relief ring 2 on the gap between the primary nested layer 8 and the secondary nested layer 11. The secondary nested layer 11 is provided with a lateral feed port 3 6, which is connected to the pressure relief ring 2 on the gap between the multi-layer outer nested layer 12 and the secondary nested layer 11.

[0035] When in use, the inner layer molten raw material enters through the side feed port 4, then passes through the pressure relief ring 2 and enters the flow barrier 3, then goes upward along the flow barrier 3 (passes through 5 flow barrier layers 3 and the pressure relief ring 2) until it is extruded out of the discharge port 7; the outer layer molten raw material enters through the transverse flow channel outside the side feed port 4, then goes upward along the pressure relief ring 2 and the flow barrier 3 (passes through 5 flow barrier layers 3 and the pressure relief ring 2), then merges with the inner layer molten raw material through the oblique flow channel and is extruded together.

Claims

1. A flow-blocking mixing and compression die head, characterized in that: The invention comprises a central nesting layer (1), a single-layer outer nesting layer (13) is arranged outside the central nesting layer (1), a lateral feed port (4) is arranged on the central nesting layer (1), a pressure relief ring (2) and a flow blocking layer (3) are arranged at intervals in the vertical direction outside the central nesting layer (1), and the inner side of the single-layer outer nesting layer (13) is smooth, and a gap is arranged between the single-layer outer nesting layer (13) and the central nesting layer (1) for the circulation of raw materials; The side feed port 1 (4) is located in the horizontal direction. The raw material exiting the side feed port 1 (4) first enters the pressure relief ring (2), and then passes through the flow barrier layer (3) and the pressure relief ring (2) at intervals upward. The number of the pressure relief ring (2) and the flow barrier layer (3) is multiple, and a discharge port (7) is provided above the gap.

2. The flow-blocking mixing and compression die according to claim 1, characterized in that: It also includes a primary nested layer (8), a secondary nested layer (11), and a multi-layer outer nested layer (12), which are used for the production of multi-layer plastic film.

3. The flow-blocking mixing and compression die according to claim 2, characterized in that: The first-level nesting layer (8) is located outside the central nesting layer (1), the second-level nesting layer (11) is located outside the first-level nesting layer (8), and the multi-layer outer nesting layer (12) is located outside the second-level nesting layer (11).

4. The flow-blocking mixing and compression die according to claim 3, characterized in that: The connection method of the primary nesting layer (8) and the central nesting layer (1) is the same as the connection method of the single outer nesting layer (13) and the central nesting layer (1).

5. The flow-blocking mixing and compression die head according to claim 3, characterized in that: A gap is provided between the secondary nested layer (11) and the primary nested layer (8) for circulation of raw materials. A pressure relief ring (2) and a flow blocking layer (3) are provided in a vertical direction on one side of the primary nested layer (8) close to the secondary nested layer (11). The upper part of the flow blocking layer (3) is connected to the gap between the primary nested layer (8) and the central nested layer (1) via a secondary oblique flow channel (9).

6. The flow-blocking mixing and compression die head according to claim 5, characterized in that: The connection method of the multi-layer outer nesting layer (12) and the secondary nesting layer (11) is the same as the connection method of the secondary nesting layer (11) and the primary nesting layer (8).

7. The flow-blocking mixing and compression die according to claim 6, characterized in that: The gap between the multi-layer outer nesting layer (12) and the secondary nesting layer (11) is connected to the gap between the primary nesting layer (8) and the central nesting layer (1) via a third-level oblique flow channel (10).

8. The flow-blocking mixing and compression die according to claim 7, characterized in that: The first-level nesting layer (8) is provided with a second lateral feed port (5), and the second lateral feed port (5) is connected to a pressure relief ring (2) on the gap between the first-level nesting layer (8) and the second-level nesting layer (11).

9. The flow-blocking mixing and compression die head according to claim 7, characterized in that: The secondary nesting layer (11) is provided with a lateral feed port three (6), and the lateral feed port three (6) is connected to a pressure relief ring (2) on the gap between the multi-layer outer nesting layer (12) and the secondary nesting layer (11).

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