Method of making a packaging bag having tear-open means

Details Method of making a packaging bag having tear-open means Method of making a packaging bag having tear-open means

1993-06-02

1994-12-13

Sipos, John

Package making

Methods

Forming a cover adjunct or application of a cover adjunct to...

531338, 53455, B65B 6118

Patent

active

053719972

ABSTRACT:
A method of making a packaging bag from a wrapper sheet includes the following steps: forming a continuous sleeve from the wrapper sheet; forming a longitudinal seal inward of and adjacent to a longitudinal folded edge of the wrapper sheet by bonding overlapping longitudinal edge portions of the sleeve to one another; forming a transverse seal bonding overlapping sheet portions to one another; cutting a tear-open slit through at least three layers of the wrapper sheet in the transverse seal in an area of intersection with the longitudinal seal; transversely severing the sleeve to provide a packaging bag having an open end spaced from the transverse seal; charging the packaging bag with goods through the open end; and forming an additional transverse seal bonding overlapping sheet portions to one another for closing the open end.

REFERENCES:
patent: 2542206 (1951-02-01), Nichols
patent: 2851212 (1958-09-01), Parmer
patent: 3083876 (1963-04-01), Schneider et al.
patent: 3276669 (1966-10-01), Vilutis
patent: 4147583 (1979-04-01), Deutchlander
patent: 4448010 (1984-05-01), Stohlquist et al.
patent: 4682976 (1987-07-01), Martin et al.
patent: 4768411 (1988-09-01), Su
patent: 4861414 (1989-08-01), Vogan

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