Method for making two compartment envelopes

摘要

This disclosure teaches a method for making two compartment envelopes each from a unitary sheet of paper. The sheet is provided with a rectangular back panel as well as side flaps, a front flap of less width than the back panel and a closure flap. A window is cut in the front flap and thereafter pressure sensitive adhesive is applied to a remote area of the closure flap as well as to the front flap about the window. Silicone coated release paper is applied over the adhesive on the closure flap and a patch of acetate film is applied to cover the window. The envelope is then gummed and folded side flap over side flap to define a first of the compartments and then front flap over side flaps to define a second of the compartments. The release paper permits the closure flap to be folded for convenient packaging. The front flap and the closure flap are folded along hinge lines and the side flaps extend beyond the hinge lines whereby the side flaps are doubled onto the back panel in folding of the front flap and the closure flap.