04297559 is referenced by 33 patents and cites 17 patents.

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.

Title
Apparatus for controlled perforation of moving webs with fixed focus laser beam
Application Number
6/37727
Publication Number
4297559
Application Date
May 10, 1979
Publication Date
October 27, 1981
Inventor
Hobart A Whitman III
Asheville
NC, US
Agent
Kerkam Stowell Kondracki & Clarke
Assignee
Olin Corporation
NC, US
IPC
H05B 3/60
B23K 26/02
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