Perforation of synthetic plastic films

Details Perforation of synthetic plastic films Perforation of synthetic plastic films

1987-04-08

1988-10-11

Pellinen, A. D.

Electric heating

Metal heating

Cutting or disintegrating

204168, 219384, 264 22, 264154, 361303, H05B 718, B29D 701, H01G 428

Patent

active

047773383

ABSTRACT:
Spark perforation of synthetic plastic film is carried out by applying electrodes to opposite ends of a portion of the film submerged in a water bath that is at a temperature above the onset temperature of glass transition of the film,and applying short fast rise time electrical pulses of an amplitude sufficient to ensure dielectric breakdown of the film. The size of the perforations formed can be controlled by altering the temperature of the water bath. By using short fast pulses, energy consumption, film decomposition and electrode erosion are minimized, and the high dielectric strength of water can be exploited to control perforation while its conductivity can be exploited to remove residual electric charges from the film. Capacitors formed by lengths of coaxial cable are used by a pulse generator for generating pulses having rise times less than one microsecond.

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