Screen for producing a perforated film
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United States of America Patent
Stats
-
Feb 17, 1998
Grant Date -
N/A
app pub date -
Jun 14, 1996
filing date -
Jun 14, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A cylindrical screen for perforating a thermoplastic film or sheets has an outer surface and an inner surface. A plurality of outer apertures extend from the outer surface and terminate at a corresponding inner aperture on the inner surface of the screen. The apertures in the outer surface can have the same or a different geometrical shape as the apertures in the inner surface. The apertures form a passageway through the screen. The passageways are disposed at least one angle from about 5.degree. to about 60.degree. with respect to a plane that is disposed substantially perpendicular to the outer surface of the screen to prevent a direct line of sight through the screen.
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Cited Art Landscape
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