METHOD FOR MAKING SECURITY-TYPE PAPER WITH LOCALIZED LOW OPACITY AREAS AND PAPER SO OBTAINED

摘要

Method for making a paper sheet. According to the invention, the sheet comprises at least one region with an area of at least 0.4 cm<2> which is less opaque than the rest of the sheet. An aqueous dispersion containing at least cellulosic fibers is disposed on an embossed screen (3), optionally placed on a cylinder mould, the excess moisture is drained from the sheet, and the sheet formed is then recovered on a lifting wire and dried. The watermarked wire is crimped to reduce the thickness of the embossed part. Application to paper for banknotes.