Extrusion preparation method and extrusion equipment for extra-large-orifice PTFE pipe fitting paste

Abstract

The invention discloses an extrusion preparation method for extra-large-orifice PTFE pipe fitting paste. The extrusion preparation method comprises the following steps of: mixing raw materials; pre-forming the raw materials; extruding and forming the raw materials; tracing extrusion speed and a position of an extruded pipe fitting, controlling an extruder through a feedback signal; sintering and forming; performing position measuring and feedback control on the position of a sintered extra-large-orifice PTFE pipe fitting product; and enabling polytetrafluoroethylene dispersion resin tube to form a product. The invention further discloses extrusion equipment for extra-large-orifice PTFE pipe fitting paste. The extrusion equipment comprises an extrusion drive part, a pushing-pressing assembly, a mandrel assembly, a raw material barrel, an extrusion mould and a thermal forming assembly which are sequentially connected coaxially, wherein the extrusion drive part is mounted on the tail part of the rack; one end of the pushing-pressing assembly is connected with the extrusion drive part; the other end of the pushing-pressing assembly is connected with one end of the mandrel assembly; the raw material barrel is mounted on the front part of the rack; the extrusion mould is mounted at an outlet end of the raw material barrel; the mandrel assembly passes through the center of the raw material barrel and the center of the extrusion mould; and the thermal forming assembly is supported in front of the rack and is concentric with the raw material barrel.

Description

technical field [0001] The invention relates to the technical field of production methods and production equipment of fluoroplastic pipes, in particular to a paste extrusion preparation method and extrusion equipment for super-large-diameter PTFE pipe fittings. Background technique [0002] Polytetrafluoroethylene (PTFE) has the best electrical insulation, chemical stability, and corrosion resistance among all plastics, and is one of the materials with the best corrosion resistance in the world today. However, polytetrafluoroethylene dispersion resin (PTFE) has an extremely narrow phase change range and loose elastic characteristics, making it difficult to extrude or injection mold like ordinary thermoplastics. Fine powder (PTFE dispersion resin) made by emulsion polymerization, adding an appropriate organic solvent to make a paste mixture for extrusion, is a common production method for PTFE dispersion resin. However, due to the particularity of PTFE, this production metho...

AI Technical Summary

Problems solved by technology

[0003] At present, domestic enterprises producing PTFE by paste extrusion method have introduced a small amount of foreign advanced equipment and automatic control systems, which cost a lot and the supply is not timely.

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