The inner and outer walls of the cavity lining of the workpiece are under the condition of equal pressure difference. Layer separation problem. The elastic mold makes full use of its elasticity to compress and close the PTFE powder in the cavity. It is widely used in severely corrosive occasions such as petroleum, chemical, pesticide, dye, pharmaceutical, military industry, and pipeline system medium or material transportation.
On the lining wall, and the thickness of the PTFE lining remains the same, it completely solves the problem of the molding technology of the cavity of the complex PTFE Coated Fabric Manufacturers shape workpiece and the problem of inconsistent lining thickness that causes local stress concentration and cracks. The PTFE lining isobaric forming technology can be applied to the cavity forming of valves (ball valves, gate valves) with complex geometric shapes and structures, which broadens and improves the use temperature range, corrosion resistance, wear resistance and sealing reliability of similar products.
The isobaric forming technology of PTFE lining includes preforming process and sintering forming process. The sintering molding process uses quartz sand expansion material as free compensation to solve the gap between the linear expansion coefficient of the metal shell and the PTFE lining during the sintering process, and the inconsistency of thermal expansion and contraction causes the separation of the PTFE lining and the metal shell.
The pre-forming process adopts elastic mold forming. At the same time, it overcomes the inconsistency of the curing reaction (exothermic reaction) speed during the sintering process, which leads to local stress concentration and cracks
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