Linerless postage stamps

G - Physics – 09 – F

Patent

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Details

G09F 3/02 (2006.01) G09F 3/10 (2006.01)

Patent

CA 2312946

A linerless postage stamp includes a paper substrate having top and bottom faces, a pressure sensitive adhesive on the bottom face, postage stamp indicia on the top face, and release material on the top face will not adhere to the adhesive but will absorb or otherwise retain stamp cancellation ink in sufficient quantities so that a cancellation pattern thereof is clearly visible. This is typically accomplished by using a styrene acrylic latex formulation barrier coat applied to the top face in an amount between about 0.7-0.8 pounds per ream of substrate sheets, and a UV curable silicone release material applied over the barrier coat on at a weight between about 0.4-0.5 pounds per ream of substrate paper.

L'invention concerne un timbre postal sans revêtement, comprenant un substrat de papier présentant une face supérieure et une face inférieure, un adhésif autocollant sur la face inférieure, une indication d'affranchissement sur la face supérieure et, également sur la face supérieure, un matériau anti-adhésif qui n'adhère pas à l'adhésif mais absorbe et retient une quantité suffisante d'encre d'oblitération pour que le cachet d'oblitération soit clairement visible. On obtient normalement ce résultat en appliquant une couche d'isolation comprenant une formulation de latex acrylique sur la face supérieure à raison d'une quantité de 0,7 à 0,8 livres par rame de feuilles de substrat, puis en appliquant un matériau anti-adhésif de silicone à traitement par U.V. sur la couche de protection à raison d'un poids compris entre 0,4 et 0,5 livres par rame de papier substrat.

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