Corona treatment of perforated film

Details Corona treatment of perforated film Corona treatment of perforated film

B - Operations, Transporting

29

C

204/96.15

B29C 71/04 (2006.01)

Patent

CA 1191478

CORONA TREATMENT OF PERFORATED FILM Abstract of the Disclosure A perforated thermoplastic film with tapered capil- laries 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.

403043

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