Process for producing perforated film
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United States of America Patent
Stats
-
Mar 2, 1982
Issued Date -
N/A
app pub date -
Apr 18, 1980
filing date -
Aug 23, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A process for the manufacture of thermoplastic sheet having elliptical perforations including a rotatable molding element having a series of hexagonal-shaped depressions having centered therein elliptical holes, the elliptical holes having a major axis and a minor axis, the major axis being oriented parallel to the direction in which the molding element is rotated, a means for applying a fluid pressure differential to a surface of the thermoplastic sheet to force the sheet against the molding element to effect rupturing of the sheet and the formation of elliptical holes in the sheet.
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