Corona treatment of perforated film

Details Corona treatment of perforated film Corona treatment of perforated film

1980-12-15

1982-09-28

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264 26, B29D 2700

Patent

active

043517846

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.

REFERENCES:
patent: 2763759 (1956-09-01), Mito et al.
patent: 3054148 (1962-09-01), Zemmerli
patent: 3394211 (1968-07-01), MacDuff
patent: 3471597 (1969-10-01), Schirmer
patent: 3880966 (1975-04-01), Zimmerman et al.
patent: 3929135 (1975-12-01), Thompson

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