Spatially distributed electrostatic perforation of moving webs

Details Spatially distributed electrostatic perforation of moving webs Spatially distributed electrostatic perforation of moving webs

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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