Packing container with openable seal-weakened top closure

Details Packing container with openable seal-weakened top closure Packing container with openable seal-weakened top closure

1987-11-19

1988-10-04

Marcus, Stephen

Envelopes, wrappers, and paperboard boxes

Paperboard box

With closure for an access opening

2066313, 229 35R, 428 35, 428352, 428532, B65D 506

Patent

active

047750960

ABSTRACT:
A packing container (2) includes a container body consisting of side walls (3,4), an arbitrary bottom closure (5), and a top closed by a bellow-type folded and heat sealed closure so as to form a top closure of the gable-top type which can be unfolded to expose an emptying opening (25) in the form of a pouring spout. To facilitate this re-unfolding, certain portions of the surfaces which are heat-sealed to one another are coated within the area of the unfoldable part of the top closure with a seal-weakening composition which is based on an aqueous dispersion of a thermoplastics material, preferably polythene, which is modified by a carboxymethyl cellulose, preferably sodium carboxymethyl cellulose.

REFERENCES:
patent: 3116002 (1963-12-01), Crawford et al.
patent: 3270940 (1966-09-01), Egleston et al.
patent: 3319868 (1967-05-01), Huang et al.
patent: 3675015 (1972-07-01), Geib
patent: 3722780 (1973-03-01), MacEwen
patent: 3900574 (1975-08-01), Warwick
patent: 3941907 (1976-03-01), Klement et al.
patent: 3997703 (1976-12-01), Nakashio et al.
patent: 4137947 (1979-02-01), Bridgeford
patent: 4378049 (1983-03-01), Hsu et al.
patent: 4533600 (1985-08-01), Coughlan et al.

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