Apparatus for perforating webs with high intensity, coherent radiation
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United States of America Patent
Stats
-
Aug 19, 1980
Grant Date -
N/A
app pub date -
Oct 3, 1978
filing date -
Oct 3, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system is provided for controlling the porosity of a web or film as perforated by high intensity, coherent radiation. In particular, there is included a laser for providing at least one beam of high intensity, coherent radiation that is directed onto a web that is moved past the beam. The porosity of the web is measured and compared with an operator-set reference of porosity to control the focus of the coherent radiation, whereby the size of the resultant perforation and therefore the porosity of the web is controlled. In one embodiment of this invention, the position of a lens to focus the coherent radiation is adjusted. In a further embodiment, a support surface for receiving the web is adjusted with respect to the fixed facus laser beam to control the size of the perforation or opening created by the beam of coherent radiation.
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