One-piece mailing document

Abstract

A blank form for a one-piece mailing document, the blank comprising: a paper substrate having a peripheral border area adjacent its edges; a pattern of adhesive located in the border area; and wherein a barrier layer is interposed between the paper substrate and the adhesive pattern.

1 . A blank form for a one-piece mailing document, the blank comprising:
 a paper substrate having a peripheral border area adjacent its edges;   a pattern of adhesive located in the border area; and   wherein a barrier layer is interposed between the paper substrate and the adhesive pattern.   
     
     
         2 . A blank form according to  claim 1 , wherein the barrier layer is formed by printer's varnish in the border area and the adhesive is applied substantially overlaying the varnish. 
     
     
         3 . A blank form according to  claim 2 , wherein the varnish is applied by a printing process. 
     
     
         4 . A blank form according to  claim 3 , wherein the varnish is UV varnish. 
     
     
         5 . A blank form according to  claim 4 , wherein the varnish is cured by UV light before adhesive is applied. 
     
     
         6 . A blank form according to  claim 2 , wherein two layers of varnish are applied in the peripheral border area before the adhesive pattern is laid down. 
     
     
         7 . A blank form according to  claim 1 , wherein the barrier layer comprises a layer of liquid silicon in the border area which is then dried and overlaid with the pattern of adhesive. 
     
     
         8 . A blank form according to  claim 1  comprising perforations at the edge of the border area so that the border area can be detached to open the document after sealing. 
     
     
         9 . A blank form according to  claim 1 , wherein the barrier layer prevents the adhesive penetrating the paper substrate and the adhesive bonds two parts of the blank together when the document is folded and forms a secure seal and the seal can be peeled apart without damaging the paper substrate. 
     
     
         10 . A method of making a blank form for a one-piece mailing document, the method comprising applying a barrier layer to a paper substrate in a border area at the peripheral edges of the paper and subsequently applying an adhesive pattern overlaying the barrier layer.