UN METODO DE PRODUCIR UN MATERIAL EN HOJA QUE LLEVA UNA IMAGEN. NO OBSTENSORA, PARTICULARMENTE UN MATERIAL EN HOJA DE PAPEL.

摘要

An unobtrusive image is applied to paper or other sheet material by means of a charged droplet printer, for example an ink jet printer. The unobtrusive image applied may perform the function usually associated with a watermark in paper, but in contrast to a watermark, may be applied to papers during their production on high speed wide deckle machines or to coated papers. The method is particularly suitable for unobtrusively imaging pressure sensitive copying material.