Electric heating – Heating devices – Electric arc-type devices
Patent
1980-07-22
1982-02-02
Mayewsky, Volodymyr Y.
Electric heating
Heating devices
Electric arc-type devices
73 38, 83 16, 219121EM, 264154, H05B 718
Patent
active
043141420
ABSTRACT:
A method and apparatus for controlling the perforation of webs being moved in a longitudinal direction, by an array of electrodes spatially distributed in a transverse direction, wherein selected control electrodes are added to or removed from the electrode array to provide a transverse, or spatial, degree of control over web porosity. Synchronized sensing of multiple point transverse web porosity, combined with logic circuitry provides the controls for selection and actuation of the appropriate control electrodes. A combined temporal and spatial porosity control embodiment is disclosed. The combined and alternate embodiments described are particularly useful for perforating paper, film, and like materials, where a high degree of area-balanced porosity control is desired.
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Brown William D.
Whitman, III Hobart A.
Mayewsky Volodymyr Y.
Olin Corporation
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