Method of making apertured films and net like fabrics
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United States of America Patent
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-
Jun 27, 1989
Grant Date -
N/A
app pub date -
Jul 30, 1987
filing date -
Jul 30, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of making apertured films including the step of perforating films of thermoplastic materials with embossing rolls engraved with patterns which form small slits or incipient slits in the sheet. The patterns are such that the design on the roll includes lands, or raised areas, which cross lands of the opposing roll at an acute angle. The perforated or partially perforated film formed may then be further processed by orientation, uniaxial or biaxial, simultaneous or sequential; by heat treatment; or both to modify the porosity, hole size, or other properties as desired.
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