teflon The sintering process is composed of three stages: heating, holding and cooling. Extrusion molding is to add polytetrafluoroethylene resin into the material cavity of the extruder to pressurize, squeeze it into the die to form dense pipes, bars and other products, and then sinter and cool them to produce products with certain specifications. Extrusion molding is characterized by continuous molding, which is the continuity of the molding process. Isobaric forming, also known as hydraulic forming, is used to manufacture large PTFE sleeves, storage tanks, hemispherical shells, large round plates, tower columns, round tubes, large blanks and square blanks used to cut large sheets, and also to manufacture integral PTFE lined three-way elbows, diversion pipes and other products with complex shapes.

Polytetrafluoroethylene has soft mechanical properties and very low surface energy.

1. High temperature resistance: long-term use temperature 200~260 ℃;

2. Low temperature resistance: soft at - 100 ℃;

3. Corrosion resistance: resistant to aqua regia and all organic solvents;

4. Weather resistance: aging life in plastic;

5. High lubrication: small friction coefficient of plastic (0.04);

6. Non sticky: it has small surface tension of solid materials without adhering to any substance;

7. Physiological inertia; With excellent electrical performance, it is an ideal Class C insulation material. A thick layer of newspaper can block 1500V high voltage; Smoother than ice.

PTFE isobaric molding has the characteristics of simple equipment, fast production, simple mold structure, easy operation, uniform pressure of products, good quality, resin saving, etc. Molding is a common method of PTFE. Some products with simple shapes, such as plates, bars, sleeves, film blanks, backing plates, etc., can be molded. The molding method basically consists of four steps: mixing, pre forming, sintering and cooling. That is, polytetrafluoroethylene is molded into dense preforms at room temperature, heated above the melting point, so that it can be transformed from crystalline phase to amorphous phase, forming dense, continuous and transparent elastomer, and then transformed into crystalline phase by cooling.