Envelope opening process and composition

Details Envelope opening process and composition Envelope opening process and composition

1979-08-13

1980-10-21

Woodberry, Edward M.

Package making

Methods

Opening only

53381R, 53381A, 156247, 252 1, 252142, B65B 4326, B65B 6900

Patent

active

042286344

ABSTRACT:
In an envelope opening process in which an aqueous solution of a chemical degradation agent, such as tartaric acid is applied to envelope edges and the envelope edges are then heated and subjected to a mild mechanical action, penetration of the degradation agent through the envelope paper at its edges is assured by including in the aqueous solution from 2.5% to 30% of a glycol ether, such as ethylene glycol ethyl ether.

REFERENCES:
patent: 3677460 (1972-07-01), Whitman
patent: 3816213 (1974-06-01), Whitman
patent: 3871573 (1975-03-01), Whitman
patent: 4082603 (1978-04-01), McPherson
patent: 4181623 (1980-01-01), Dillarstone
patent: 4189341 (1980-02-01), McPherson et al.

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