Patent Number: 6,251,223

Title: Process for improving printing paper

Abstract: A process for improving gravure and offset printability of coated and uncoated printing papers by increasing filler share in the paper on the top and bottom sides or in the outer layers of the paper web by using a retention agent, and providing the outerlayers of the fiber bearing liquid forming the paper web with additional retention agent before or during sheet formation on or between the wires of the paper making machine.

Inventors: Kessler; Hansjorg (Meerbusch, DE), Horand; Dieter (Niederkruchten, DE), Friesen; Wolfram (Nettetal, DE)

Assignee: Stora Publication Paper AG

International Classification: D21H 23/00 (20060101); D21H 23/76 (20060101); D21H 21/10 (20060101); D21H 17/55 (20060101); D21H 17/56 (20060101); D21H 17/00 (20060101); D21H 17/37 (20060101); D21H 17/29 (20060101); D21H 17/32 (20060101); D21H 023/04 (); D21H 023/28 ()

Expiration Date: 06/26/2018