Apparatus for making quadruple profile plastic tubing for bag

Details Apparatus for making quadruple profile plastic tubing for bag Apparatus for making quadruple profile plastic tubing for bag

1985-12-11

1987-03-24

Moon, Charlie T.

Metal working

Plural diverse manufacturing apparatus including means for...

Binding or covering and cutting

29450, 29235, 29415, 29417, 425297, 4253021, 425307, 425383, 4253051, B21B 1500, B21D 3903, B23P 2304, B23P 2500

Patent

active

046513949

ABSTRACT:
Apparatus for making flexible plastic bags with integral pressure interlocking rib and groove elements on the confronting top edges, comprises an extruder for extruding a continuous tube with pairs of closely spaced interlocking elements on the surface of the tube, the total pairs being a multiple of 2 with at least 4 pairs on the tube, a slitter for slitting the tube lengthwise between profiles of alternate pairs, and a folder for folding the tube between each adjacent pair and for bringing the profile adjacent the slit over onto the closest profile of the pair which has not been slit.

REFERENCES:
patent: Re29331 (1977-08-01), Naito
patent: 3500727 (1970-03-01), Behr et al.
patent: 3503112 (1970-03-01), Siegel
patent: 3532571 (1970-10-01), Ausnit
patent: 3543343 (1970-12-01), Staller et al.
patent: 3581344 (1971-06-01), Sederlund et al.
patent: 3945403 (1976-03-01), Takashi
patent: 3948705 (1976-04-01), Ausnit
patent: 4249982 (1981-02-01), Ausnit
patent: 4290467 (1981-09-01), Schmidt
patent: 4341575 (1982-07-01), Herz
patent: 4372793 (1983-02-01), Herz
patent: 4571797 (1986-02-01), Bergamaschi

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