Apparatus for controlled perforation of moving webs with fixed f

Details Apparatus for controlled perforation of moving webs with fixed f Apparatus for controlled perforation of moving webs with fixed f

1979-05-10

1981-10-27

Rubinson, Gene Z.

Electric heating

Metal heating

By arc

219121LK, 219121LL, 219384, B23K 2602, H05B 360

Patent

active

042975590

ABSTRACT:
A system for precision perforation of moving webs employing a pulsed, fixed focus laser beam wherein the laser pulses are automatically controlled in pulse repetition frequency and in pulse width to provide a desired preset web porosity. Closed loop circuitry responsive to web speed, sensed web porosity, and a porosity preset signal provides the precise system control needed to produce and maintain the preset porosity over a wide range of system variables. The illustrative embodiment described is particularly useful for perforating paper, film, and like materials where a high degree of product uniformity and porosity control is desired.

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