Method of making quadruple profile tubing

Details Method of making quadruple profile tubing Method of making quadruple profile tubing

1983-03-03

1986-01-07

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

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

Forming continuous work followed by cutting

156 66, 156229, 15624422, 15624425, 264564, 264152, 264159, 264177R, 4253051, B29C 5336

Patent

active

045633193

ABSTRACT:
The method of making flexible plastic bags with integral pressure interlocking rib and groove elements on the confronting top edges, comprises the steps of 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, slitting the tube lengthwise between profiles of alternate pairs, and folding the tube between each adjacent pair and 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: 3945403 (1976-03-01), Noguchi
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

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