Method and apparatus for electrically perforating dielectric...

Details Method and apparatus for electrically perforating dielectric... Method and apparatus for electrically perforating dielectric...

H - Electricity

05

B

327/30

H05B 7/20 (2006.01) A24C 5/00 (2006.01) B26F 1/28 (2006.01) G01N 15/08 (2006.01)

Patent

CA 1065413

TITLE OF THE INVENTION METHOD AND APPARATUS FOR ELECTRICALLY PERFORATING DIELECTRIC WEBS INVENTOR: HOBART A. WHITMAN, III ABSTRACT OF THE DISCLOSURE A system is provided for controlling the porosity of a web or film issuing from an electric spark perforating apparatus in accordance with all operator-set reference porosity regardless of variations in web speed, inherent web porosity, spark discharge energy and spark repetition frequency by controlling the frequencies of the electrical sparks applied to the web in accordance with the product of two signals, one a difference signal obtained by comparing the porosity of the web leaving the perforator and the ref- erence porosity and the other signal derived from the speed of the web.

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