Polytetrafluoroethylene/polyimide composite insulated smooth wire and cable and its preparation method
A technology of polytetrafluoroethylene and polyimide, which is applied in the direction of insulated cables, cable/conductor manufacturing, conductor/cable insulation, etc., can solve the problems of poor surface smoothness and poor scratch resistance, and achieve Excellent arc resistance, excellent wear resistance, excellent moisture resistance
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[0033] The preparation method of PTFE / polyimide composite insulated smooth wire and cable includes the following steps:
[0034] 1) Select silver-plated or nickel-plated copper stranded conductors with American standard specifications AWG24~10;
[0035] 2) A concentric wrapping machine is used to wrap a layer of polyimide (PI) composite tape with a thickness of 0.03mm-0.05mm outside the silver-plated or nickel-plated copper stranded conductor, and then wrap the polyimide (PI) composite tape with a thickness of 0.05mm. One layer of tetrafluoroethylene (PTFE raw material tape), the wrapping rate is 50.5%~54%;
[0036] 3) After wrapping, use a sintering furnace for high-temperature sintering (sintering temperature 300℃~560℃, sintering speed 2~8m / min), so that the polyimide material wrapping layer and PTFE wrapping layer are bonded together. Form the wire and use tooling for surface treatment during sintering (the tooling is composed of several sets of guide wheels in different directio...
Embodiment
[0044] QLYW11223-20-WU / W, using 19 0.203mm nickel-plated round copper wires stranded, through a compression mold, to obtain (0.95±0.02)mm stranded conductor; using a concentric wrapping machine to wrap 0.05mm thickness polyimide One layer of amine tape and one layer of PTFE tape with a thickness of 0.05mm wrapped around the package. The overlap rate is between 50.5% and 54%; after wrapping, it is sintered at a high temperature through a sintering furnace (sintering temperature 300℃~560℃, sintering 2~8m / min speed), make the two layers of strips into one body, and use tooling for surface treatment during sintering (the tooling consists of several sets of guide wheels in different directions, installed in the front and middle of the sintering furnace, and pressed on-line during processing The cable surface makes the softened cable insulation surface smoother and smoother) to improve the smoothness of the insulation surface; then the 3 wires are twisted into a cable using a cable fo...
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