专利检索 ap:("Polska Wytwornia Papierow Wartosciowych S.A.") AND inv:"Lula, Magdalena" 第 1 页

1.

发明公开
METHOD FOR PRODUCING OF MARKED PAPER SUBSTRATE WITH THE MARK IN THE FORM OF A WATERMARK AND A MARKED SECURITY PAPER SUBSTRATE, IN PARTICULAR A SECURITY PAPER, OBTAINED BY SUCH A METHOD 审中-公开

公开(公告)号：EP4223548A1

公开(公告)日：2023-08-09

申请号：EP22217014.4

申请日：2022-12-28

申请人： Polska Wytwornia Papierow Wartosciowych S.A.

发明人： Gawel, Kamil , Lula, Magdalena

IPC分类号： B42D25/305 , B42D25/309 , B42D25/324 , B42D25/333 , B42D25/351 , B42D25/435

摘要： Method for manufacturing a paper substrate with a marking, with the steps: providing a paper substrate which can be fibrous paper; applying a mark to the substrate by irradiating it with an ultra-fast laser which is a femtosecond laser with a pulse below 400 fs, whose beam modifies the paper substrate, the mark being obtained by selective, local removal of paper substrate layers in the area defined on the basis of the desired image, and wherein the thinning of the paper substrate obtained by selectively locally removing layers of the paper substrate to produce the watermark in irradiating step is less than the thickness of the paper substrate, and the area over which it is applied does not differ in colour from the area not processed with an ultrafast laser. The resolution can be 900-1500 DPI. The paper can be uncoated and have 40-700 g.