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

1976-09-15

1977-10-25

Garbe, Stephen P.

Envelopes, wrappers, and paperboard boxes

Envelope

Closures

34 1, 156273, 219 1081, B65D 2714

Patent

active

040552950

ABSTRACT:
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.

REFERENCES:
patent: 2087410 (1937-07-01), Lane et al.
patent: 2147689 (1939-02-01), Chaffee
patent: 2606856 (1952-08-01), Hurrey et al.
patent: 2676416 (1954-04-01), Calosi et al.
patent: 2723517 (1955-11-01), Mittelmann
patent: 3293765 (1966-12-01), Winkler et al.
patent: 3357108 (1967-12-01), Bennett
patent: 3396474 (1968-08-01), Walther et al.
patent: 3404462 (1968-10-01), Hanson et al.
patent: 3456355 (1969-07-01), Cumming et al.

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