Use of microencapsulated glue in the manufacture of envelopes

Details Use of microencapsulated glue in the manufacture of envelopes Use of microencapsulated glue in the manufacture of envelopes

1977-06-27

1979-01-16

Coan, James F.

Stock material or miscellaneous articles

Composite

Of bituminous or tarry residue

93 62, 93 74, 428307, B31B 1960

Patent

active

041343220

ABSTRACT:
Envelopes having moistenable gum on the seal flap and back gum adhering the sides and bottom are manufactured by a process comprising applying a back gum to either the bottom flap or the side flaps in the form of microcapsules. When the bottom and side flaps are folded and pressure is applied, the microcapsules rupture causing the back gum to adhere the bottom and side flaps. Gum in the form of microcapsules can also be applied to the seal flap allowing the end user to seal without moisture.

REFERENCES:
patent: 2420963 (1947-05-01), Malo
patent: 2986477 (1961-05-01), Elchel
patent: 4055111 (1977-10-01), Howatt

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