Infrared heat treatment of plastic film capacitors

Details Infrared heat treatment of plastic film capacitors Infrared heat treatment of plastic film capacitors

1980-11-03

1982-12-14

Hall, Carl E.

Metal working

Electric condenser making

Solid dielectric type

264 25, 2504921, 219354, H01G 700

Patent

active

043631622

ABSTRACT:
An improved method for producing spirally wound film-foil or metallized film capacitors. The capacitors are formed by spirally winding alternating layers of dielectric film and metal foil (or two layers of metallized film) around a mandrel to form a cylinder. The dielectric film is oriented, i.e., heated and stretched along one or more axes, prior to winding. The wound cylinder is subjected to infrared radiant energy, which causes the dielectric film to shrink back toward its original unoriented state, thereby forcing air out between the layers of the winding and resulting in a more rigid cylinder. The application of radiant energy enables the cylinder to be heated from the inner turns to the outer turns. This manner of heating enables significant improvements in capacitor properties to be obtained and greatly reduces the time required for the heat shrink operation.

REFERENCES:
patent: 3723708 (1973-03-01), Tulkoff
patent: 3955127 (1976-05-01), Hunt
patent: 4037298 (1977-07-01), Flanagan et al.
patent: 4092382 (1978-05-01), Heckman et al.
patent: 4260567 (1981-04-01), Poppe et al.

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