Opening of envelope with darkened edges

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

B - Operations, Transporting

65

B

149/18, 120/58

B65B 43/26 (2006.01) B43M 7/00 (2006.01) B65D 27/32 (2006.01)

Patent

CA 1149690

ABSTRACT OF THE DISCLOSURE OPENING OF ENVELOPE WITH DARKENED EDGES 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.

344743

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