Apparatus for forming bags of thermoplastic material

Details Apparatus for forming bags of thermoplastic material Apparatus for forming bags of thermoplastic material

1979-05-24

1981-07-07

Coan, James F.

Manufacturing container or tube from paper; or other manufacturi

Container making

Pliable container

156257, 156510, 156535, 493227, 493 34R, 493370, 493927, B31B 114

Patent

active

042772419

ABSTRACT:
In an apparatus for forming and separating the side edges of plastic bags of the type which have opposed interlocking closure strips, an intermittent transport device transports a half-tube of thermoplastic sheeting to a welding device. The sheeting is stopped while welding is performed. At a milling station upstream of the welding device, a milling apparatus is actuated while the half-tube is stopped to mill off a short length of each of the opposed closure strips at a position which coincides with the position at which welding will later be performed.

REFERENCES:
patent: 3417675 (1968-12-01), Ausnit
patent: 3543379 (1970-12-01), Naito
patent: 3857329 (1974-12-01), Lehmacher et al.
patent: 3986914 (1976-10-01), Howard
patent: 4055109 (1977-10-01), Kan
patent: 4094729 (1978-06-01), Boccia
patent: 4138932 (1979-02-01), Mowli et al.

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