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A threaded inner wall extrusion die and a method for improving the degree of fiberization of film rods

An extrusion die and fiberization technology, which is applied in the field of threaded inner wall extrusion dies, can solve the problems of disordered direction of fiberization, low degree of fiberization of rods, difficulty in guaranteeing the mechanical properties and uniformity of PTFE film, etc., and achieve fiberization Precise direction, improved shear friction, and enhanced fibrosis

Active Publication Date: 2022-04-15
NANJING FIBERGLASS RES & DESIGN INST CO LTD +1
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are two disadvantages in the extrusion process of PTFE film processed by traditional technology. One is that the degree of fibrosis of the rod after extrusion is low, and the other is that the direction of fibrillation is more chaotic.
The above two defects make it difficult to guarantee the mechanical properties and uniformity of the final PTFE film

Method used

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  • A threaded inner wall extrusion die and a method for improving the degree of fiberization of film rods
  • A threaded inner wall extrusion die and a method for improving the degree of fiberization of film rods

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Embodiment Construction

[0022] Below by giving an example and in conjunction with listed accompanying drawing, technical content of the present invention is specifically set forth, as follows:

[0023] Such as figure 1 As shown, a threaded inner wall extrusion die includes a mold body 1, a tapered cavity 2 and an extrusion hole 3 are arranged in the mold body 1, and the small-diameter end of the tapered cavity 2 communicates with the extrusion hole 3, Different from conventional molds, threads 4 are provided on the inner wall of the tapered cavity 2 of the present invention, and the specifications of the threads 4 can be specifically set according to the performance requirements of the product.

[0024] Preferably, the depth direction of the thread 4 is perpendicular to the inner wall surface of the tapered cavity 2 .

[0025] Preferably, the inner diameter of the thread 4 is the same as the inner diameter of the tapered cavity 2, and the outer diameter is determined according to the degree of fibro...

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Abstract

The present invention proposes a threaded inner wall extrusion die and a method for improving the degree of fibrosis of a film material rod. The holes are connected, and the inner wall of the cone cavity is provided with threads. The invention can effectively improve the shear friction between the powder particles and the inner wall of the mold during the plunger pushing process of PTFE by providing threads on the inner wall of the cone cavity, so that the degree of fibrosis of the rod can be significantly improved. And due to the guiding effect of the thread, the direction of the shear force is always parallel to the direction of the thread, and the corresponding microfibers will be oriented along the direction of the thread, and the fiberization direction is more accurate, ensuring that the final produced Quality uniformity and mechanical stability of PTFE film, the polytetrafluoroethylene film of general mold production, the CV value of its thickness uniformity is at 30~50%, and adopt the PTFE film prepared by the present invention, the CV value of its thickness uniformity Can reach within 10%.

Description

technical field [0001] The invention belongs to the technical field of moulds, and in particular relates to a threaded inner wall extrusion die and a method for improving the fiberization degree of a film material rod. Background technique [0002] With its many advantages, polytetrafluoroethylene (PTFE) is being widely used in aerospace, petrochemical, electronics, medicine and other fields. For PTFE, because of its high viscoelasticity, if it is processed by screw extrusion, the performance of the product will be greatly affected. Therefore, most of the continuously produced PTFE products are processed by plunger extrusion. In the production process of the traditional PTFE breathable film, the extrusion process of the PTFE body generally uses a mold with a smooth inner wall, and then the PTFE microporous membrane is produced according to processes such as calendering, biaxial stretching, heat treatment and horizontal stretching. , the process flow is: [0003] PTFE resin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C48/30B29C48/06B29D7/01
CPCB29C48/30B29C48/06B29D7/01
Inventor 高政余佳彬郭晓蓓张振费传军尹奕玲匡新波陈昊光张剑魏涛李帅
Owner NANJING FIBERGLASS RES & DESIGN INST CO LTD
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