Process for preparing low voltage varistors

Details Process for preparing low voltage varistors Process for preparing low voltage varistors

H - Electricity

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H01C 17/00 (2006.01) B22F 5/10 (2006.01) B30B 15/02 (2006.01) H01C 7/102 (2006.01) H01C 17/30 (2006.01)

Patent

CA 1142653

RD 7658 ABSTRACT OF THE DISCLOSURE Low voltage varistors having one or more recesses or dimples which reduces the thickness of the varistor in the recessed areas are provided by an improved process which comprises fitting a pressiny surface on a die punch with a resilient material, preferably an adhesive material such as polydimethylsiloxane, having one or more nipples whereby during pressing of a metal oxide varistor powder contained in the die cavity the nipple imparts a depression thereby reducing the thickness of the varistor body in said depression. In addition, the resilient material aids in the distribution of the powder during pressing and with the preferred adhesive material aids also in the release of the pressed body from the die.

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