Screen for producing a perforated film
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United States of America Patent
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-
Oct 8, 1996
Grant Date -
N/A
app pub date -
Jun 14, 1994
filing date -
Jun 14, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A cylindrical screen for perforating a thermoplastic film or sheets. The screen is formed from a relatively thin sheet that is secured together to form a cylindrical shape. A plurality of apertures are positioned in the sheet and the apertures in the sheets forms a passageway through the screen. The passageways are disposed at an angle from about 5.degree. to about 60.degree. with respect to a plane that is disposed substantially perpendicular to the surface of the screen.
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