Method for making side seam envelopes from a web

Details Method for making side seam envelopes from a web Method for making side seam envelopes from a web

1978-01-05

1979-11-13

Coan, James F.

B31B 2100

Patent

active

041739221

ABSTRACT:
A paper web is unwound and conveyed through an envelope making machine where a side flap cutting device forms side flaps in the side edges of the web. Scorer rollers form longitudinal scores in the side flaps and the side flaps are thereafter folded along the score lines. Other scorer rollers form transverse score lines for the top and bottom flaps of the envelope. Envelope blanks having the folded side flaps are thereafter severed from the web and separated from each other. After the blanks are severed from the web, gum is applied to the upper surface of the side flaps of the severed envelope blanks and the bottom flap is folded into overlying relation with the folded side flaps to form the pocket in the envelope. The so formed envelopes are thereafter collated into overlying relation with the edges of the top flap exposed. Gum is applied to the top flaps and dried. The top flap is then folded into overlying relation with the bottom flap.

REFERENCES:
patent: 2054832 (1936-09-01), Potdevin
patent: 2153848 (1939-04-01), Shea et al.
patent: 2673497 (1954-03-01), Heitmann
patent: 3344719 (1967-10-01), Weisshuhn
patent: 3628304 (1971-12-01), Hornung

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