Special screw for etfe article production

By designing a specialized screw structure and materials, the problem of ultra-temperature and stress deformation in ETFE products during extrusion molding was solved, enabling efficient and stable production of ETFE products and improving production efficiency and product quality.

CN224510368UActive Publication Date: 2026-07-17JIANGSU JWELL INTELLIGENT MASCH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
JIANGSU JWELL INTELLIGENT MASCH CO LTD
Filing Date
2025-08-11
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

In the existing technology, the extrusion molding process of ETFE products suffers from problems such as overheating and scorching, stress deformation and low production efficiency, resulting in a high defect rate and failing to meet the needs of high-speed production.

Method used

A special screw for the production of ETFE products was designed. It is made of C276 Hastelloy alloy and is divided into a feeding section, a pre-compression section, a plug flow conveying section, a compression melting section, a metering section and a mixing section. The outer diameter and lead of the screw are constant. The bottom diameter of the pre-compression section and the compression melting section gradually increases. The mixing section is equipped with multiple mixing groups to avoid strong shear and overheating and ensure uniform melting of materials.

Benefits of technology

It improves the extrusion stability and efficiency of ETFE products, reduces energy consumption, enhances product quality and production efficiency, and reduces the defect rate.

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Abstract

The application discloses a special screw for ETFE product production, which comprises a rod body extending in the front-back direction and a screw thread spirally extending on the rod body from front to back. The rod body is sequentially divided into a feeding section, a pre-compression section, a plug flow conveying section, a compression melting section, a metering section and a mixing section from front to back. The outer diameter and lead of the screw thread are uniformly distributed in the feeding section, the pre-compression section, the plug flow conveying section, the compression melting section and the metering section. The bottom diameter of the pre-compression section and the bottom diameter of the compression melting section gradually increase from front to back. The bottom diameter of the plug flow conveying section is greater than that of the feeding section. The bottom diameter of the metering section is greater than that of the plug flow conveying section. The compression ratio of the screw thread in the pre-compression section and in the feeding section is 1.15-1.25. The compression ratio of the screw thread in the compression melting section and in the feeding section is 2.4-2.6. A plurality of mixing groups are arranged on the mixing section from front to back at intervals. Each mixing group comprises a plurality of mixing square pins arranged at intervals in the circumferential direction of the rod body. The structure of the application is smooth and the function is clear. The extrusion is stable, and the extrusion efficiency and quality are improved.
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Claims

1. A special screw for the production of ETFE products, comprising a rod extending in a front-to-back direction and a thread extending helically from front to back on said rod, characterized in that, The rod body is divided into the following sections from front to back: a feeding section, a pre-compression section, a plug flow conveying section, a compression melting section, a metering section, and a mixing section. The threads are distributed across these sections, with the outer diameter and lead of the threads remaining constant from front to back. The bottom diameters of the pre-compression section and the compression melting section gradually increase from front to back. The bottom diameter of the plug flow conveying section is larger than that of the feeding section, and the bottom diameter of the metering section is larger than that of the plug flow conveying section. The compression ratio of the threads in the pre-compression section and the feeding section is 1.15-1.25, and the compression ratio of the threads in the compression melting section and the feeding section is 2.4-2.

6. Multiple mixing groups are arranged at intervals from front to back on the mixing section, and each mixing group includes multiple mixing square pins arranged at intervals along the circumference of the rod body.

2. The dedicated screw of claim 1, wherein The length of the compression melting section is greater than the length of the metering section, the length of the metering section is greater than the length of the plug flow conveying section, the length of the plug flow conveying section is greater than the length of the feeding section, the length of the feeding section is greater than the length of the mixing section, and the length of the mixing section is greater than the length of the pre-compression section.

3. The dedicated screw of claim 1, wherein The minimum bottom diameter of the pre-compression section is equal to the bottom diameter of the feed section, and the maximum bottom diameter of the pre-compression section is equal to the bottom diameter of the plug flow conveying section.

4. The dedicated screw of claim 1, wherein The minimum bottom diameter of the compression melting section is equal to the bottom diameter of the plug flow conveying section, and the maximum bottom diameter of the compression melting section is equal to the bottom diameter of the metering section.

5. The dedicated screw of claim 1, wherein The lead of the thread is 25mm-35mm.

6. The dedicated screw of claim 1, wherein Multiple mixing pins of two adjacent mixing groups are arranged axially offset on the rod.

7. The dedicated screw of claim 6, wherein, The misalignment angle of the mixing pins of two adjacent mixing groups is 30°-45°.

8. The dedicated screw of claim 1, wherein, The mixing section is equipped with four mixing groups.

9. The dedicated screw of claim 1, wherein, The material used is C276 Hastelloy.