Double envelope and method of making same

Abstract

A double envelope construction comprised of one envelope inside another envelope is formed in one pass on an envelope folding machine by providing a pre-cut envelope blank and a paper blank of smaller size than the envelope blank, adhering the paper blank to the envelope blank by means of fugitive adhesive, applying remoistenable seal gum to the flap portion of the envelope blank, drying the seal gum, and scoring the adhered together envelope and paper blanks at predetermined locations and folding the scored blanks while applying adhesive to predetermined areas thereof to form an outer envelope from the envelope blank and an inner envelope inside the outer envelope from the paper blank. The envelope blank or the paper blank, or both, may be preprinted prior to being fed to the envelope folding machine or may be printed by a printer in-line with the envelope folding machine.

Dependencies are inferred from the claim text.