Screen for selectively perforating thermoplastic film
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United States of America Patent
Stats
-
Jan 13, 1987
Issued Date -
N/A
app pub date -
Apr 11, 1985
filing date -
Jun 1, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus for the manufacture of selectively apertured thermoplastic sheet or film, comprising a rotatable molding element means for receiving the film and which means has a predetermined pattern therein wherein as the film is contacted with the rotatable molding element means and a fluid pressure differential is applied to the surface of the film, a desired pattern of perforated areas and non-perforated areas are imparted to the film with each of said areas being continuous across the web of the film and alternating in the machine direction.
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