Electric heating – Heating devices – Electric arc-type devices
Patent
1982-09-28
1985-03-05
Envall, Jr., Roy N.
Electric heating
Heating devices
Electric arc-type devices
83 16, 162114, 162192, 315 35, H05B 718
Patent
active
045033188
ABSTRACT:
Apparatus for spark perforation of sheet material comprising spaced apart first and second electrodes which define between them a sparking zone through which sheet material to be perforated can be moved in a predetermined direction, and in which the portion of the first electrode which is nearest to the nearest portion of the second electrode is located between an overlap position upstream of the second electrode in the direction of movement of the sheet by a distance of 1 mm and an offset position also equal to 1 mm in the direction of movement of the sheet, and means for guiding the sheet through the sparking zone along a path closer to said second electrode than said first electrode.
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Envall Jr. Roy N.
Evans Geoffrey S.
Wiggins Teape Group Limited
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