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Die for producing poly(tetrafluoroethylene) plug cock and preparation method of plug cock

A polytetrafluoroethylene and mold technology, which is applied in the field of mold and the preparation of the cock, can solve the problems of cumbersome manufacturing process, waste, and difficulty in forming, and achieve the effects of increasing the output qualification rate, reducing production costs, and improving production efficiency

Inactive Publication Date: 2014-11-19
TIANJIN TIANSUBINHAI PTFE PLASTIC PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional polytetrafluoroethylene tapered plug valves are mostly machined from polytetrafluoroethylene tubular profiles. The manufacturing process is cumbersome, the input of raw materials is large, the production cost is high, and the process consumption is large, resulting in unnecessary waste. However, the existing technology It is to set the polytetrafluoroethylene cock into a cone with equal wall thickness, such as the patent application number 201120442949.9 "Mold for making polytetrafluoroethylene bushings for large plug valves", which is not easy to form during the production process, and the product The pass rate of one output is low

Method used

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  • Die for producing poly(tetrafluoroethylene) plug cock and preparation method of plug cock

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of method utilizing above-mentioned mold to prepare polytetrafluoroethylene cock, raw material selects polytetrafluoroethylene suspension resin, comprises the following steps:

[0031] (1) Add the polytetrafluoroethylene suspension resin into the cavity 8, install the upper die 3, pressurize downwards, pre-press the polytetrafluoroethylene suspension resin, the pressure is 15MPA, and the pressure holding time is 5min;

[0032] (2) Two-way molding is used after holding the pressure, that is, the upper die 3 and the lower die 6 are pressurized at the same time, the pressure reaches 25MPA, and the holding time is 10min;

[0033] (3) Pressurize upwards on the lower die 6 again, the pressure is 15MPA, and the pressure holding time is 5min, after the pressure holding finishes, the mold is ejected, and the tapered tubular blank is made;

[0034] (4) Put the conical tubular blank on the outside of the plastic pile with the same shape and size as the central core 4, put i...

Embodiment 2

[0037] A kind of method utilizing above-mentioned mold to prepare polytetrafluoroethylene cock, raw material selects polytetrafluoroethylene suspension resin, comprises the following steps:

[0038] (1) Add the polytetrafluoroethylene suspension resin into the cavity 8, install the upper die 3, pressurize downwards, pre-press the polytetrafluoroethylene suspension resin, the pressure is 20MPA, and the holding time is 5min;

[0039] (2) Two-way molding is used after holding the pressure, that is, the upper die 3 and the lower die 6 are pressurized at the same time, the pressure reaches 35MPA, and the holding time is 10min;

[0040] (3) Pressurize upwards on the lower die 6 again, the pressure is 20MPA, and the pressure holding time is 5min, after the pressure holding is finished, the mold is ejected, and the tapered tubular blank is made;

[0041] (4) Put the conical tubular blank on the plastic pile with the same shape and size as the central core 4, and put it into the sinter...

Embodiment 3

[0044] A kind of method utilizing above-mentioned mold to prepare polytetrafluoroethylene cock, raw material selects polytetrafluoroethylene suspension resin, comprises the following steps:

[0045] (1) Add the polytetrafluoroethylene suspension resin into the cavity 8, install the upper die 3, pressurize downward, and pre-press the polytetrafluoroethylene suspension resin, the pressure is 1MPA, and the holding time is 15min;

[0046] (2) Two-way molding is used after the pressure holding, that is, the upper die 3 and the lower die 6 are simultaneously pressurized, the pressure reaches 40MPA, and the holding time is 1min;

[0047] (3) Pressurize upwards on the lower die 6 again, the pressure is 1MPA, and the pressure holding time is 15min, after the pressure holding finishes, the mold is ejected to make a tapered tubular blank;

[0048] (4) Put the conical tubular blank on the plastic pile with the same shape and size as the central core 4, and put it into the sintering furnac...

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Abstract

The invention provides a die for producing a poly(tetrafluoroethylene) plug cock. The die comprises a shell, a core die and a compression die which form a forming die together; the die is fixed by a base and the shell is barrel-shaped; the core die comprises a central core, an upper slide way and a lower slide way which are integrally molded; the central core is of a tapered structure; the thick end of the central core is connected with the upper slide way and the thin end of the central core is connected with the lower slide way; the compression die comprises an upper compression die and a lower compression die. The invention further provides a preparation method of the poly(tetrafluoroethylene) plug cock. The poly(tetrafluoroethylene) plug cock is prepared by taking poly(tetrafluoroethylene) suspension resin as a raw material and the die and a bidirectional compression die method are adopted. The die for producing the poly(tetrafluoroethylene) plug cock and the preparation method of the plug cock have the advantages and active effects that a production process for a poly(tetrafluoroethylene) tapered plug cock throttling valve is simplified and the production efficiency is improved; meanwhile, raw materials are saved and the production cost is reduced; a product is easy to form and the one-time output yield of the product is increased.

Description

technical field [0001] The invention belongs to the technical field of cock valves and processing thereof, and in particular relates to a mold for producing polytetrafluoroethylene cocks and a preparation method of the cocks. Background technique [0002] PTFE material has excellent high and low temperature resistance and chemical stability, good electrical insulation performance, non-adhesion, weather resistance, flame retardancy and good self-lubricating performance. It is widely used in fields such as medical treatment and machinery. The PTFE plug valve utilizes the corrosion resistance and anti-adhesion properties of PTFE material, and can be widely used in anti-corrosion pipelines in the chemical industry. Conventional polytetrafluoroethylene tapered plug valves are mostly machined from polytetrafluoroethylene tubular profiles. The manufacturing process is cumbersome, the input of raw materials is large, the production cost is high, and the process consumption is large...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C43/36B29C43/02
Inventor 魏元刚王鸿昇
Owner TIANJIN TIANSUBINHAI PTFE PLASTIC PROD
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