Envelope with adhesive separable closures - has side flaps and sealing flap, each with corresp. adhesive and non-stick surfaces

摘要

The envelope has side flaps (6,7) and a sealing flap (9), all formed as adhesive separable closures for non-destructive unfolding of the flaps into the blank form. The closures comprise one surface (10,14) of an adhesive layer and an opposing surface (11,12,13) of a printed or sprayed non-stick layer, such as a wax or silicon based material. USE - To enable envelopes bearing internal advertising printing to be simply unfolded without tearing.