Method for marking a sheet of paper and sheet with a watermark

摘要

A method for marking a watermark-type pattern onto at least part of an absorbent paper sheet is described. The method involves stress-deforming the sheet by making it pass between at least one first roll and at least one second roll. A film of additive is applied in unheated manner to at least one of the sheet surfaces during the marking stage, thereby enhancing watermark formation. Additionally described is an absorbent paper sheet including at least one cellulose web ply which is made by the above method.