Perforation of synthetic plastic films

Details Perforation of synthetic plastic films Perforation of synthetic plastic films

H - Electricity

05

B

327/33

H05B 7/18 (2006.01) B26D 7/08 (2006.01) B26F 1/28 (2006.01) B29D 7/01 (2006.01)

Patent

CA 1307031

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, and applying short fast rise time electrical pulses of an amplitude suffi- cient 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 dielec- tric strength of water can be exploited to control per- foration whilst its conductivity can be exploited to remove residual electric charges from the film.

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