DEVICE FOR PERFORATING SHEET VIA DISCHARGE

摘要

A spark perforation apparatus includes a rotary electrode assembly for effecting spark perforation of sheet material passing between the electrodes of the assembly and a suitably juxtapositioned earthed surface. The electrode assembly comprises a first set of annular electrodes for connection to a suitable power source, a second set of annular electrodes alternating with and of greater external diameter than the electrodes of the first set, and dielectrical material spacing the electrodes so as to form a series of parallel capacitors.