Opening of envelope with darkened edges

Details Opening of envelope with darkened edges Opening of envelope with darkened edges

1979-02-05

1980-09-16

Culver, Horace M.

Package making

Methods

Opening only

83912, B65B 4326, B65B 6900

Patent

active

042222168

ABSTRACT:
A process is provided for the opening of envelopes made of cellulosic paper by the action of a chemical degradation agent in the presence of radiant heat in which the radiant heat is generated from a source maintained at a temperature high enough to produce a substantial amount of radiation having a wave length of 2 microns or less and by applying to the edges to be opened a darkening material capable of absorbing a substantial portion of the incident radiant energy.

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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