Method of perforating thermoplastic film

Details Method of perforating thermoplastic film Method of perforating thermoplastic film

1975-07-03

1976-09-07

Hoag, Willard E.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Making hole or aperture in article

156 82, 156252, B29F 500, B29D 720

Patent

active

039794946

ABSTRACT:
A plastic film packaging bag is fabricated with directionally tear-prone wicket mounting holes having a hole edge reinforcing bead of plastic selectively thinner in the desired tearing direction formed by a hot gas stream directed through shaped templates holding the bag.

REFERENCES:
patent: 3012918 (1961-12-01), Schaar
patent: 3092439 (1963-06-01), Harrison
patent: 3394211 (1968-07-01), MacDuff

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