Apparatus for electrically perforating dielectric webs

Details Apparatus for electrically perforating dielectric webs Apparatus for electrically perforating dielectric webs

1976-05-25

1977-05-24

Mayewsky, Volodymyr Y.

Electric heating

Heating devices

Electric arc-type devices

315326, H05B 718

Patent

active

040257525

ABSTRACT:
A system is provided for controlling the porosity of a web or film issuing from an electric spark perforating apparatus in accordance with an 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 reference porosity and the other signal derived from the speed of the web.

REFERENCES:
patent: 3098143 (1963-07-01), Warmt
patent: 3364390 (1968-01-01), Karp et al.
patent: 3385951 (1968-05-01), Bancroft et al.
patent: 3502845 (1970-03-01), Schirmer
patent: 3760153 (1973-09-01), Davies et al.
patent: 3783237 (1974-01-01), McArthur

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