Self-sealing envelope and method of making same

Details Self-sealing envelope and method of making same Self-sealing envelope and method of making same

B - Operations, Transporting

65

D

220/33, 93/62

B65D 27/14 (2006.01)

Patent

CA 1048452

ABSTRACT OF THE DISCLOSURE A self-sealing envelope is made by folding a paper blank having a flap, a front panel, a back panel and end flaps. Back seams of the body are sealed with an adhesive having a predetermined dielectric constant. Strips of latex material having the same or a lesser dielectric constant are applied to the flap and body in positions which register when the flap is closed. The envelope is dried in a dielectric heating chamber. Suitable latex materials have a low pH factor or a low metal salt content.

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