Patent ID: 6348675
Filing Date: 2002-02-19
Classification: B26F,Y10T

Abstract:
A method of manufacturing plastics film wherein high-voltage pulses are applied between a pair of electrodes so as to create pores in a plastics film fed into the spark gap between said electrodes, wherein the number of discharge sparks which are generated subsequent to a pore-open discharge spark is controlled by monitoring the pore-opening discharge spark and subsequent discharge sparks within one of the high-voltage pulses by setting a threshold value S atB+(Aâˆ’B)/32(Aâˆ’B)/3 wherein A is the voltage drop at the time of a partial discharge spark of the electrode on the side of the spark gap to which the high-voltage pulse is applied and B is the voltage drop at the time of a pore-opening discharge spark.