Patent ID: 6063239
Filing Date: 2000-05-16
Classification: D21H

Abstract:
A method for the manufacture of security paper, such as banknote paper, which method comprises forming a papermaking suspension comprising cellulosic fibres and polyvinyl alcohol fibres wherein the cellulosic fibres are present in an amount of at least 80% by weight of the total weight of the fibres in the suspension, characterised in that the polyvinyl alcohol fibres are soluble in water at temperatures of from 95.degree. to 100.degree. C., are 3 to 5 mm in length, and are present in an amount of from 2 to 10% by weight based on the weight of the fibres, wherein the papermaking suspension comprising cellulosic fibres and the polyvinyl alcohol fibres is dewatered through an embossed wire mesh, wherein the embossing creates a profile of peaks and troughs corresponding to the light and dark areas of the watermark, and the thus formed paper with the watermark feature after dewatering is thereafter dried to provide the resulting security paper.