Reusable envelope with self-adhesive flap - has adhesive filler or synthetic film stabilised sealing surface

摘要

The re-usable envelope has a self-adhesive flap with a protective strip (5). The area of the envelope where the flap seals down is stabilised with a plastic filler resin (6), ordinary adhesive or latex based adhesive. - The protected section could equally be a synthetic film glued to the paper.