Capacitor having a hazy polypropylene film

Details Capacitor having a hazy polypropylene film Capacitor having a hazy polypropylene film

H - Electricity

01

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334/18

H01G 4/22 (2006.01) B29C 47/00 (2006.01) B29C 55/28 (2006.01) B29C 59/00 (2006.01) B29D 7/01 (2006.01) B32B 27/32 (2006.01) H01G 4/18 (2006.01) H01G 4/32 (2006.01)

Patent

CA 1053339

ABSTRACT OF THE DISCLOSURE Hazy polypropylene film having a uniformly irregular or raised relief surface is provided for use as a die- lectric medium in dielectric liquid impregnated electrical capacitors. In the blown tube process for manufacturing the film, the polypropylene tube emanating from an extruder has a section of the tube controlled in temperature. The temperature control causes continuous and uniform spherulite formation having a crystalline structure on the outer sur- face of the tube. Subsequent inflation of the tube causes the desired hazy irregularity to occur on the outer surface.

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