Household plastic film in roll form and embodying a curled leadi

Details Household plastic film in roll form and embodying a curled leadi Household plastic film in roll form and embodying a curled leadi

1974-12-05

1976-03-23

Price, William

Special receptacle or package

For roll or reel

Wrapped, boxed, or secured through roll core

428195, 428906, B65D 8567

Patent

active

039454959

ABSTRACT:
Rolls of household or consumer type films or wrapping materials are provided with a curled leading edge that is ideally suited as a grasping tab for starting initial withdrawal of the film such as from a standard consumer type dispensing carton. The invention is applied to films exhibiting relatively high residual shrinkage or stress relaxation and is practiced by applying a coating to, or alternately solvent treating, the leading edge, in a manner that unbalances the rate of shrinkage at the opposite surfaces of the edge, thereby inducing a curling effect. Further attributes of such a starting feature would include easy identification of the leading edge, and the lessening of sensitivity to tear propagation such as from a notch or a like tear propagating flaw as may be left in the leading edge by the film cutter bar.

REFERENCES:
patent: 1949259 (1934-02-01), Salsman
patent: 2857047 (1958-10-01), Edelson
patent: 3201030 (1965-08-01), Pollack
patent: 3204949 (1965-09-01), Kieslich
patent: 3712463 (1973-01-01), Bestehorn

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