Method of applying a laminated insulating film to copper wire

Details Method of applying a laminated insulating film to copper wire Method of applying a laminated insulating film to copper wire

1975-05-19

1976-11-02

Simmons, David A.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Making electrical conductors of indefinite length

174117FF, H01B 1326

Patent

active

039895610

ABSTRACT:
In a preferred form, this disclosure relates to a method for continuously applying a polyimide electrically insulating film laminated on one side with a fluorinated resin such as that marketed by DuPont under the trade designation Teflon FEP-fluorocarbon resin onto a metal conductor. The method includes the steps of (a) simultaneously longitudinally feeding the conductor and the laminated film with the fluorinated resin side adjacent the conductor into a guide means, (b) partially wrapping the film around the metal conductor into a guide means, (c) passing the partially wrapped conductor and the film through a first heater means, in an inert atmosphere to preheat the copper conductor to a temperature of from about 500.degree. F. to about 600.degree. F., (d) completely wrapping the laminated film, in an inert atmosphere, around the conductor by sequentially folding the ends over the conductor in an overlapping relationship to define a longitudinally extending seam, (e) heating the fully wrapped conductor in an inert atmosphere to a temperature of at least 700.degree. F., but below that temperature at which the polyimide will rapidly degrade to soften the fluorinated resin layer and allow it to flow into intimate contact with conductor while maintaining the wrapped film in clamped engagement with the sides of the conductor, and then cooling the wrapped conductor in an inert atmosphere to cause the fluorinated resin to harden and bond the film to the metal conductor.

REFERENCES:
patent: 3359096 (1967-12-01), Jost
patent: 3408453 (1968-10-01), Shelton
patent: 3777198 (1973-12-01), Anderson et al.

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