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Hot-mold injection molding technology for fluoroplastic-lined corrosion-resistant valve

A valve and fluorine-lined technology, which is applied in the hot mold injection molding process of fluorine-lined plastic valves, can solve the problems of highly toxic hydrogen fluoride gas emission, large consumption of raw materials, large temperature fluctuations, etc., to eliminate the risk of environmental pollution, high temperature decomposition, The effect of ensuring stability

Inactive Publication Date: 2018-04-17
苏州贝利氟塑制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above process has the following problems: 1. The processing cycle is long, and the processing cycle is about 3.5 hours; 2. Each is filled and heated, and the efficiency of the step-by-step intermittent production method is low; 3. The consumption of raw materials is large; 4. The temperature during the heating process Large fluctuations can easily lead to problems such as overheating, decomposition and modification of materials; 5. During the heating and plasticizing process, a large amount of highly toxic hydrogen fluoride gas is emitted, polluting the environment and causing occupational hazards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The invention discloses a thermal mold injection molding process for a fluorine-lined plastic valve, which comprises the following steps:

[0020] Step 1, derusting the valve casting and assembling the valve casting into the mold;

[0021] Step 2, heating the mold, the heating temperature is 395°C, and the heating time is 2 hours;

[0022] Step 3, injecting molten FEP fluid into the mold through an injection molding machine at an injection temperature of 330° C., and then pressure-holding molding at a pressure of 20 MPa;

[0023] Step 4, cooling and demoulding, and cooling to 200°C for demoulding to obtain a fluorine-lined plastic valve.

Embodiment 2

[0025] The invention discloses a thermal mold injection molding process for a fluorine-lined plastic valve, which comprises the following steps:

[0026] Step 1, derusting the valve casting and assembling the valve casting into the mold;

[0027] Step 2, heating the mold, the heating temperature is 400°C, and the heating time is 2 hours;

[0028] Step 3, injecting molten FEP fluid into the mold through an injection molding machine at an injection temperature of 330° C., and then pressure-holding molding at a pressure of 16 MPa;

[0029] Step 4, cooling to below 200°C and demoulding to obtain a fluorine-lined plastic valve.

Embodiment 3

[0031] The invention discloses a thermal mold injection molding process for a fluorine-lined plastic valve, which comprises the following steps:

[0032] Step 1, derusting the valve casting and assembling the valve casting into the mold;

[0033] Step 2, heating the mold, using a gas direct heating oven for heating, the heating temperature is 398°C, and the heating time is 2 hours;

[0034] Step 3: Inject the molten FEP fluid into the mold through the injection molding machine in the gas-fired direct-heating oven, the injection temperature is 330°C, and then pressure-holding and molding, the pressure is 18MPa;

[0035] Step 4, cooling and demoulding to obtain a fluorine-lined plastic valve.

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PUM

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Abstract

The invention discloses a hot-mold injection molding technology for a fluoroplastic-lined corrosion-resistant valve. The hot-mold injection molding technology comprises the steps that 1, a valve casting is subjected to rust removal and is assembled into a mold; 2, the mould is heated, the heating temperature is 395-400 DEG C, and the heating time is 2 hours; 3, molten FEP fluid is injected into the mold through an injection molding machine, the injection temperature is 330 DEG C, then pressure-maintaining and forming is carried out, and the pressure is 16-20 MPa; and 4, cooling and demouldingare carried out so as to obtain the fluoroplastic-lined corrosion-resistant valve. The hot-mold injection molding technology has the advantages of being reasonable high in production efficiency, low in energy consumption and high in yield.

Description

technical field [0001] The invention relates to the field of valve manufacturing, in particular to a thermal mold injection molding process for a fluorine-lined plastic valve. Background technique [0002] Fluorine-lined valves, also known as fluoroplastic-lined corrosion-resistant valves, are molded (or inlaid) fluoroplastics (or profiles) placed on the inner wall of steel or iron valve pressure parts (the same method is applicable to all Such pressure vessels and pipeline accessories) or the outer surface of valve internals, making use of its unique performance in resisting strong corrosive media to make various valves and pressure vessels. The traditional production process of fluorine-lined plastic valves includes the following processes: rust removal of valve castings - mold assembly - filling of FEP powder - overall heating of electric oven - pressure maintaining molding - cooling and demoulding. The above process has the following problems: 1. The processing cycle is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/73B29C45/74B29C45/14B29K27/12B29L31/00
CPCB29C45/14B29C45/73B29C45/74B29C2045/7381B29K2027/12B29L2031/7506
Inventor 盛尖峰
Owner 苏州贝利氟塑制品有限公司
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