Fluoroplastic cable molding characteristics and process

1, hot extrusion process When the temperature of the barrel inside the extruder reaches about 350°C-390°C, F46 fluoroplastic is added into the hopper, and by using the thrust of the rotating screw, it is evenly and continuously wrapped on the conductive wire core through the molding die, and then cooled down and shaped. This method uses Φ30, Φ60, Φ90 and other high temperature plastic extruders, often producing F46 type, F40 type and other fluoroplastic insulation products. 2、Push extrusion process The powdered PTFE plastic is pre-pressed into a cylinder, put into the barrel of the machine, use the piston to push, through the molding die evenly and continuously wrapped in the conductive core, and then sintered at a high temperature of 380°C, and then cooled and shaped. This method uses F4 pushing machine to produce F4 (PTFE) type products. 3, winding process Cut into a certain width of PTFE film tape wrapped around the core, and then sintered and shaped. This method uses winding machine and sintering furnace, usually produce AFR type, FSFB type and other wires. 4, fluorine plastic extrusion process development: PTFE can not melt extrusion, must be wrapped through the film or paste extruded out of the production of wire and cable, the need to use specialized equipment, equipment, complex, long process, and the production is intermittent, the production speed is also limited. Therefore, the development of melt-extrudable fluoroplastics has been a major issue in the polymer industry. FEP is the first successful development of melt-extrudable fluoroplastics. It maintains almost all of the excellent properties of PTFE, and is still the most widely used fluorine-containing plastic in addition to PTFE. The continuous use temperature of FEP is 200℃, and the successful development of PFA really has melt-extrudable fluoroplastics that can be used at 250℃, but the price is expensive. ETFE, PVDF, in the basic maintenance of a variety of PTFE properties, with their small specific gravity, strength, irradiation resistance of the three major advantages of fluorinated plastics in the emerging, and in the wire and cable has been widely used. 5, fluorine plastic extrusion equipment: in addition to PVDF allows the use of general extruder extruder wire, a variety of other fluorine plastics have to be used in high-temperature extruder production of wires and cables. Molten fluorine resin with high-temperature extruder requirements: sufficient heating power to ensure that high temperature (for example, 450 ℃ or so) under the conditions of the resin can be melted and extruded; parts in contact with the melt: screw, screw chamber, the head and its components, molds, etc., are to be used in high-temperature corrosion-resistant alloys, such as nickel-based alloys (including the new domestic No. 3 steel), mainly due to the possible generation of HF during the extrusion process, such as fluorine-containing gases have a very strong corrosive. 6, fluorine plastic extrusion materials: with different fluorine plastics have different operating temperatures, the conductor also needs different applicable temperatures. Taking into account the extrusion may produce gas corrosion of the conductor, fluorine plastic wire and cable almost all use silver-plated, tin-plated, nickel-plated and other plating compound conductor. Wire and cable research, producers should be based on the needs of wire and cable users, the correct choice of conductors and insulation materials, not only to meet customer requirements, but also insulating materials used in the right place. Therefore, should be familiar with, master the characteristics of a variety of fluoroplastics. 7, fluorine plastic extrusion process: the melt viscosity of fluorine-containing plastic melt is very great, it is not appropriate to use " pressure " extrusion (or else it will be too demanding requirements on the equipment); but the melt is strong enough to allow the stretching, so it is almost always the use of " casing " extruded out of the production of wire and cable, through the Control of reasonable stretch coefficient to ensure that the bond between the insulation and conductor. "Casing" extrusion, mold design or production of "Matching mold", should ensure that the value of the DDR, DBR two parameters in the extruded material allowed within reasonable limits. -8, on the BBC Electronic Products Network platform related to the introduction and sales of products brief: BBC Electronic Products Network - a professional agent / production / sales of a variety of {connectors | wiring harness | wire and cable products }; if you have a related [connectors | wiring harness | wire and cable products] purchasing / sourcing needs or would like to buy / to understand which connectors | wiring harness | wire and cable product solutions that we can provide, please contact the Division below! Business personnel; If you have related [connectors | harness | wire and cable products] sales / resources and promotion needs, please click on the "→ Business Cooperation ←" and special people to discuss!