Method for the manufacture of plastic bags with welded side seam

Flexible bags – Lifting or suspending element – Unitary with bag

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383 17, 383 37, 206554, B65D 3308

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active

048114189

ABSTRACT:
A process for the production of carry bags from synthetic resin film with lateral seams made by cutoff welding and with an approximately sinusoidal load-bearing rim with punched-in handle openings, involves a series of steps wherein a tubular film of double width and laid flat is cut open along its center in a wave shape with crests and troughs for the paired production of two sets of bags, and, along the cutting edges, turned-over rims are folded parallel to the folding edges, in each case either toward the outside or toward the inside, and the turned-over rims are welded (usually by heat bonding) at least partially to the lower end upper sheet layers of resulting semitubular lengths from the inside or outside, i.e. at least in a region surrounding the handle opening to be punched out subsequently.

REFERENCES:
patent: 1726740 (1929-09-01), Joffe
patent: 3442437 (1969-05-01), Mann
patent: 3506185 (1970-04-01), Christensen
patent: 3967775 (1976-07-01), Kramming
patent: 4044890 (1977-08-01), Kramming
patent: 4125220 (1978-11-01), Suominen
patent: 4562925 (1986-01-01), Pistner
patent: 4690280 (1987-09-01), Meyer

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