| 摘要 |
In a method of making paper selected areas are transparentised to provide enhanced security features. The method comprises the steps of depositing fibres onto a support surface to form a porous absorbent sheet, applying a composition comprising a transparentising resin containing an iridescent substance to at least a portion of said porous sheet and subsequently impregnating the porous sheet with a sizing resin. The resin may be applied by a screen printer (23) upstream of the size bath (18). The method may use a cylinder mould process as shown or a Fourdrinier process. The resin may be "fixed" by radiation. A luminescent dye may be added to the resin. Intaglio printing may also be used to apply the resin. <IMAGE> |
