A PEEK insulation extrusion structure for electrical wires
By optimizing the extrusion screw structure and the inner die cone angle design, the problems of uneven material discharge and excessive pressure in the extrusion process of PEEK insulation layer were solved, achieving a high-quality insulation layer coating effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HOI LUEN ELECTRICAL MFGR CO LTD
- Filing Date
- 2025-04-07
- Publication Date
- 2026-05-26
AI Technical Summary
Existing PEEK insulation layers are prone to problems such as uneven material output and excessive extrusion pressure of crystals during the extrusion process, resulting in poor molding quality.
By adopting a rationally designed extrusion screw structure, including the design of the extrusion thread spacing and diameter in the compression section, plasticizing transition section and discharge section, and adding auxiliary threads in the plasticizing transition section, combined with the optimization of the cone angle of the inner die and die sleeve, the uniform extrusion of molten PEEK material is ensured.
This achieves a tight wrapping of the PEEK insulation layer on the outer surface of the wire, resulting in a smooth and defect-free appearance and improved molding quality.
Smart Images
Figure CN224276092U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wire production and processing technology, specifically to an extrusion structure for a PEEK insulation layer of a wire. Background Technology
[0002] In the production of insulated wires, an insulation layer needs to be wrapped around the conductor to protect the internal structure of the wire and prevent leakage. Existing insulated wires primarily use granular PP material in production. During production, a screw feeds the plasticized PP material into an extrusion die, where it wraps around the conductor surface to provide insulation. PEEK (polyetheretherketone) is a fully aromatic, semi-crystalline thermoplastic engineering plastic with the high-temperature resistance, excellent mechanical strength, chemical stability, radiation resistance, and electrical properties of thermosetting plastics, making it an ideal wire insulation material. However, due to PEEK's high melting point, high melt viscosity, and relatively slow flow, existing extrusion structures are prone to problems such as uneven material output and excessive extrusion pressure, resulting in poor quality PEEK insulation layers. Summary of the Invention
[0003] This invention addresses the shortcomings of existing technologies by providing an extrusion structure for PEEK insulation layers in electrical wires. This structure improves the molding quality of the PEEK insulation layer, ensuring that the extruded PEEK tightly coats the outer surface of the wire with a smooth and defect-free appearance.
[0004] To achieve the above objectives, the present invention adopts the following technical solution:
[0005] An extrusion structure for a PEEK insulation layer in electrical wires includes a screw barrel with an inlet and an outlet. An extrusion screw is disposed within the screw barrel along the material conveying direction. The outer surface of the extrusion screw has helically distributed extrusion threads. A mold assembly is disposed at the outlet of the screw barrel. The extrusion screw sequentially comprises a compression section, a plasticizing transition section, and a discharge section along the material conveying direction. The spacing of the extrusion threads in the compression and discharge sections is the same. The spacing of the extrusion threads in the plasticizing transition section is greater than that in the compression section. The diameter of the plasticizing transition section gradually increases from the compression section to the discharge section. Furthermore, the distance between the outer surface of the extrusion threads in the compression, plasticizing transition, and discharge sections and the inner wall of the screw barrel is the same. By rationally designing the extrusion screw structure, problems such as uneven material discharge and excessive crystal extrusion pressure during PEEK extrusion are avoided. This allows the PEEK outer sheath to better wrap around the conductor, providing insulation, and results in a smooth, defect-free appearance.
[0006] As a preferred embodiment, the distance between the outer surface of the extrusion threads of the compression section, plasticizing transition section and discharge section and the inner wall of the screw barrel is less than 0.3 mm.
[0007] As a preferred embodiment, the diameter of the compression section is 36 mm, the diameter of the discharge section is 45 mm, and the diameter of the plasticizing transition section gradually changes from 36 mm to 45 mm.
[0008] As a preferred embodiment, the outer surface of the plasticizing transition section is further provided with helically distributed auxiliary threads. The distance between the outer surface of the auxiliary threads and the inner wall of the screw barrel is the same as the distance between the outer surface of the extrusion threads and the inner wall of the screw barrel. By adding auxiliary threads, the material output during extrusion screw operation becomes more uniform.
[0009] As a preferred embodiment, the length of the compression section is 340-360mm, the length of the plasticizing transition section is 410-430mm, and the length of the discharge section is 220-240mm.
[0010] As a preferred embodiment, the width of the extruded thread is 4 mm.
[0011] As a preferred embodiment, the mold assembly includes an inner mold and a mold sleeve disposed outside the inner mold, wherein the difference between the outer cone angle of the inner mold and the inner cone angle of the mold sleeve is 5 to 8°.
[0012] As a preferred embodiment, the outer cone angle of the inner mold is 21–25°, and the inner cone angle of the mold sleeve is 26–30°.
[0013] Compared with the prior art, this utility model has obvious advantages and beneficial effects. Specifically, by reasonably setting the structure of the extrusion screw, problems such as uneven discharge and excessive crystal extrusion pressure during PEEK extrusion are avoided, allowing the PEEK outer sheath to better wrap the conductor and have a smooth and defect-free appearance. By reasonably setting the cone angle of the inner mold and the mold sleeve, the molten PEEK material can be extruded more evenly from the mold and tightly wrapped around the conductor.
[0014] To more clearly illustrate the structural features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments: Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the overall assembly structure of an embodiment of this utility model;
[0016] Figure 2 This is a schematic diagram of the structure of an extrusion screw according to an embodiment of the present invention;
[0017] Figure 3 This is a schematic diagram of the inner mold structure according to an embodiment of the present utility model;
[0018] Figure 4This is a schematic diagram of the mold structure according to an embodiment of the present utility model.
[0019] Explanation of reference numerals in the attached diagram:
[0020] 10. Screw barrel; 20. Extrusion screw; 21. Compression section
[0021] 22. Plasticizing transition section; 23. Discharge section; 24. Extrusion thread.
[0022] 25. Auxiliary thread; 30. Mold assembly; 31. Inner mold.
[0023] 32. Mold α, outer cone angle β, inner cone angle. Detailed Implementation
[0024] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0026] Please refer to Figure 1-4As shown, an extrusion structure for a PEEK insulation layer of an electrical wire includes a screw barrel 10 with an inlet and an outlet. An extrusion screw 20 is disposed inside the screw barrel 10 along the material conveying direction. The outer surface of the extrusion screw 20 is provided with helically distributed extrusion threads 24. A mold assembly 30 is disposed at the outlet of the screw barrel 10. The extrusion screw 20 is sequentially provided with a compression section 21, a plasticizing transition section 22, and a discharge section 23 along the material conveying direction. The spacing of the extrusion threads 24 in the compression section 21 and the discharge section 23 is the same. The spacing of the extrusion threads 24 in the plasticizing transition section 22 is greater than the spacing of the extrusion threads 24 in the compression section 21. The diameter of the plasticizing transition section 22 gradually increases from the compression section 21 to the discharge section 23. Furthermore, the distance between the outer surface of the extrusion threads 24 in the compression section 21, the plasticizing transition section 22, and the discharge section 23 and the inner wall of the screw barrel 10 is the same. By rationally setting the structure of the extrusion screw 20, problems such as uneven discharge and excessive crystal extrusion pressure during PEEK extrusion are avoided, allowing the PEEK outer sheath to better wrap the conductor and have a smooth and defect-free appearance.
[0027] Specifically, the distance between the outer surface of the extrusion thread 24 of the compression section 21, the plasticizing transition section 22 and the discharge section 23 and the inner wall of the screw barrel 10 is less than 0.3 mm. By reasonably setting the distance between the outer surface of the extrusion thread 24 and the inner wall of the screw barrel 10, the material is extruded from the screw barrel 10 more stably.
[0028] Specifically, the diameter of the compression section 21 is 36mm, the diameter of the discharge section 23 is 45mm, and the diameter of the plasticizing transition section 22 gradually changes from 36mm to 45mm. The length of the compression section 21 is 340-360mm, the length of the plasticizing transition section 22 is 410-430mm, and the length of the discharge section 23 is 220-240mm. The width of the threaded edge of the extrusion thread 24 is 4mm.
[0029] In this invention, the outer surface of the plasticizing transition section 22 is further provided with helically distributed auxiliary threads 25. The distance between the outer surface of the auxiliary threads 25 and the inner wall of the screw barrel 10 is the same as the distance between the outer surface of the extrusion threads 24 and the inner wall of the screw barrel 10. By adding the auxiliary threads 25, the material output of the extrusion screw 20 is made more uniform during operation.
[0030] Specifically, the mold assembly 30 includes an inner mold 31 and a mold sleeve 32 disposed outside the inner mold 31. The difference between the outer cone angle α of the inner mold 31 and the inner cone angle β of the mold sleeve 32 is 5 to 8°. The outer cone angle α of the inner mold 31 is 21 to 25°, and the inner cone angle β of the mold sleeve 32 is 26 to 30°.
[0031] In summary, this utility model avoids problems such as uneven material output and excessive extrusion pressure during PEEK extrusion by reasonably setting the structure of the extrusion screw, so that the PEEK outer sheath can better wrap around the conductor and has a smooth appearance; by reasonably setting the cone angle of the inner mold and the die sleeve, the molten PEEK material can be extruded more evenly from the mold and tightly wrapped around the conductor.
[0032] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Therefore, any modifications, equivalent substitutions, improvements, etc., made to the above embodiments based on the actual technical aspects of the present utility model shall still fall within the scope of the technical solution of the present utility model.
Claims
1. A wire PEEK insulation layer extrusion structure, comprising a screw cylinder provided with an inlet and an outlet, an extrusion screw is arranged in the screw cylinder along the material conveying direction, the outer surface of the extrusion screw is provided with an extrusion thread spirally distributed, and a die assembly is arranged at the outlet of the screw cylinder, characterized in that, The extrusion screw is provided with a compression section, a plasticizing transition section and a discharge section in sequence along the material conveying direction. The extrusion threads of the compression section and the discharge section have the same spacing. The extrusion threads of the plasticizing transition section have a larger spacing than the extrusion threads of the compression section. The diameter of the plasticizing transition section gradually increases from the compression section to the discharge section. Furthermore, the outer surface of the extrusion threads of the compression section, the plasticizing transition section and the discharge section is the same as the distance between the outer surface of the extrusion threads and the inner wall of the screw barrel.
2. The PEEK insulation layer extrusion structure for electrical wires according to claim 1, characterized in that, The distance between the outer surface of the extrusion threads of the compression section, plasticizing transition section and discharge section and the inner wall of the screw barrel is less than 0.3 mm.
3. The PEEK insulation layer extrusion structure for electrical wires according to claim 1 or 2, characterized in that, The diameter of the compression section is 36mm, the diameter of the discharge section is 45mm, and the diameter of the plasticizing transition section gradually changes from 36mm to 45mm.
4. The extruded structure of PEEK insulation layer for electrical wires according to claim 1, characterized in that, The outer surface of the plasticizing transition section is also provided with a spirally distributed auxiliary thread, and the distance between the outer surface of the auxiliary thread and the inner wall of the screw barrel is the same as the distance between the outer surface of the extrusion thread and the inner wall of the screw barrel.
5. The PEEK insulation layer extrusion structure for electrical wires according to claim 1, characterized in that, The length of the compression section is 340-360mm, the length of the plasticizing transition section is 410-430mm, and the length of the discharge section is 220-240mm.
6. The PEEK insulation layer extrusion structure for electrical wires according to claim 1, characterized in that, The width of the extruded thread is 4 mm.
7. The extruded structure of PEEK insulation layer for electrical wires according to claim 1, characterized in that, The mold assembly includes an inner mold and a mold sleeve disposed outside the inner mold, wherein the difference between the outer cone angle of the inner mold and the inner cone angle of the mold sleeve is 5 to 8°.
8. The PEEK insulation layer extrusion structure for electrical wires according to claim 7, characterized in that, The outer cone angle of the inner mold is 21-25°, and the inner cone angle of the mold sleeve is 26-30°.