Corona treatment of perforated film
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United States of America Patent
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-
Sep 28, 1982
Grant Date -
N/A
app pub date -
Dec 15, 1980
filing date -
Dec 15, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A perforated thermoplastic film with tapered capillaries which has an increased liquid flow rate through the tapered capillaries and a method for making such a film. The method includes subjecting a perforated thermoplastic film having tapered capillaries to a corona discharge treatment sufficient to increase the flow rate of liquid through said perforated film. The film made in accordance with the invention has a much higher liquid transmission rate than the perforated film of the prior art. Furthermore, the film may be treated with a corona discharge continuously as the film is being formed and perforated.
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