Method of electrically perforating a planar web

Details Method of electrically perforating a planar web Method of electrically perforating a planar web

1978-10-18

1980-06-10

Mayewsky, Volodymyr Y.

Electric heating

Heating devices

Electric arc-type devices

83 16, H05B 718

Patent

active

042074584

ABSTRACT:
A web is electrically perforated at high hole density by applying alternating-current voltage across an electrode pair facing the web while pressurized gas is supplied to the electrode gap. Voltage amplitude level and gas flow level are selected to provide for the striking of multiple arcs per half-cycle, thereby enabling reduction in spacing between adjacent perforations in the web. Perforation practice involving preselection of cigarette filter tipping paper based on chemical composition of the paper is also disclosed as is apparatus for use in implementing the described practices, wherein electrode support members have gas flow conduits formed integrally therewith and wherein webs are taken up by a capstan drive unit resiliently biased into engagement with a web take-up roll.

REFERENCES:
patent: 2372508 (1945-03-01), Meaker
patent: 2678373 (1954-05-01), Suran
patent: 2754207 (1956-07-01), Schur et al.
patent: 3098143 (1963-07-01), Warmt
patent: 3862396 (1975-01-01), Machida et al.
patent: 4020850 (1977-05-01), Cogbill

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