Process for preparing an air-permeable film
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United States of America Patent
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Apr 29, 1986
Grant Date -
N/A
app pub date -
Jun 15, 1984
filing date -
Jun 23, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A process for producing an air-permeable film, which comprises: (a) biaxially stretching a tubular unstretched film of a composition comprising 42 to 87 vol % of a thermoplastic resin and 58 to 13 vol % of an inorganic filler along a truncated-conical mandrel; (b) blowing a gas over the outside of the biaxially stretched tubular film to cool said film; and (c) simultaneously blowing a gas continuously into the tube of the film so as to penetrate the gas through the film and go outside.
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