Folded paper edge opening process

Details Folded paper edge opening process Folded paper edge opening process

1978-09-27

1980-03-25

Culver, Horace M.

Package making

Methods

Opening only

83912, B65B 4326, B65B 6900

Patent

active

041943422

ABSTRACT:
A process is provided for the opening of envelopes made of cellulosic paper in which there is applied to at least one envelope edge as the sole reactant with the cellulose therein a non-noxious organic acid having at least one pK value at room temperature between about 1.5 and about 5, followed by the application of heat and mild mechanical action to the envelope edge.

REFERENCES:
patent: 2032645 (1936-03-01), Youtz
patent: 2866589 (1958-12-01), Zacker
patent: 2992629 (1961-07-01), Belopavlovich, Jr.
patent: 3116718 (1964-01-01), Krupotich et al.
patent: 3132629 (1964-05-01), Krupotich
patent: 3677460 (1972-07-01), Whitman
patent: 3815325 (1974-06-01), Berger
patent: 3871573 (1975-03-01), Whitman
patent: 4069011 (1978-01-01), Gunther, Jr.

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