Process and apparatus for making plastic carrying bags or sacks

Details Process and apparatus for making plastic carrying bags or sacks Process and apparatus for making plastic carrying bags or sacks

1986-08-22

1989-06-13

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156251, 156498, 156515, 493190, 493195, 493200, 493203, 493209, 493238, 493267, B31B 164

Patent

active

048389773

ABSTRACT:
To make plastic carrying bags or sacks, sections are cut or are severed by hot wire welding from a gusseted tubular film by a formation of transverse seam welds and transverse severing cuts or by hot wire-welded transverse seam welds. At least in their bottom portion the sections are provided with corner seam welds, which are separately formed in the two folds and which diverge obliquely from the outer fold lines toward the top and/or bottom seam weld and terminate short of the inner fold line and merge into the latter. To prevent in the making of the carrying bags an elongation of the intermediate portion of the tubular film, the latter is initially formed with corner seam welds only in one fold of each of the two gussets before the transverse seam welds and transverse severing cuts or hot wire-welded transverse seam welds are formed. When said corner seam welds have cooled, congruent corner seam welds are formed in the respective other folds.

REFERENCES:
patent: 439849 (1890-11-01), Kelliher
patent: 3143277 (1961-05-01), La Fleur
patent: 3291373 (1965-06-01), Joyce
patent: 3357152 (1967-12-01), Geigel
patent: 3580486 (1971-05-01), Kugler
patent: 3748205 (1973-07-01), Adams
patent: 4476979 (1984-10-01), Reimann et al.
patent: 4554192 (1985-11-01), Benoit
patent: 4571235 (1986-02-01), Benoit
patent: 4636190 (1987-01-01), Herder
patent: 4655737 (1987-04-01), Benoit

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