Method for electrically perforating dielectric webs

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United States of America Patent

PATENT NO 4447709
SERIAL NO

06106369

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A method 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.

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Patent Owner(s)

  • ECYSTA CORPORATION, A CORP OF DE.;P. H. GLATFELTER COMPANY

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Whitman, III Hobart A Asheville, NC 8 119

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