Arrangement for effecting the superfine perforation of film-like

Details Arrangement for effecting the superfine perforation of film-like Arrangement for effecting the superfine perforation of film-like

1979-07-02

1981-07-14

Mayewsky, Volodymyr Y.

Electric heating

Heating devices

Electric arc-type devices

73 38, 493364, 131281, 131336, 156274, 219121EB, 219383, 346162, H05B 718

Patent

active

042788714

ABSTRACT:
Arrangement for effecting the superfine perforation of film-like sheeting with the aid of high-voltage pulses. The sheeting to be perforated is permitted to pass in a contactless manner between two areal electrode fields. The electrode fields consist of a multitude of needles which are aligned to one another in a mirror-inverted manner and arranged in rows, with each time pairs of them forming discharge or sparking gaps. The needles of the first electrode field are in a direct conductive connection with each time one high-ohmic resistor. Each needle pair is arranged within the secondary circuit of an ignition transformer. These transformers have a high transformation ratio. On the primary side, the transformers are connected via transistor switches, to a source of low d.c. voltage. The transistor switches are initiated groupwisely via a distributor (ring counter) which, in turn, is controlled by a clock-pulse generator.

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patent: 3419752 (1968-12-01), Schmidt
patent: 3622751 (1971-11-01), Larive
patent: 3783237 (1974-01-01), McArthur
patent: 3985997 (1976-10-01), Burley

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