Arrangement for effecting the superfine perforation of film-like sheeting with the aid of high-voltage pulses

Claim 1

An arrangement for electrically perforating a film-like sheet by means of high-voltage pulses, comprising an energizing circuit arrangement, a first stationary electrode including a first multi-row needle field member carrying a plurality of needles and a first connecting board to electrically connect said first needle field member to said energizing circuit arrangement; a second stationary electrode including a second multi-row needle field member carrying a plurality of needles and a second connecting board to electrically connect said second needle field member to said energizing circuit arrangement; said first multi-row needle field member being arranged at an equally spaced distance from said second multi-row needle field member to receive in a space therebetween said film-like sheet adapted for advancing movement along said members, said circuit arrangement including a transformer for generating the high-voltage pulses, said needles of said first needle field member being aligned in a mirror-inverted arrangement to said needles of said second needle field member and having point ends and pointless ends the latter of which directed toward said connecting boards respectively; and a series of high-ohmic resistors mounted in said first connecting board, said pointless ends of said needles being arranged in a direct conductive connection with said corresponding high-ohmic resistors, said first needle field member and said second needle field member each including a plate of insulating material having a plurality of openings for receiving said needles, and said distance between the spaced members being somewhat greater than the thickness of said film-like sheet.