US 11,724,533 B2
System and process for persistent marking of flexo plates and plates marked therewith
Wolfgang Sievers, Kremperheide (DE); Pascal Thomas, Hamburg (DE); and Thomas Klein, Wolfenbuettel (DE)
Assigned to ESKO-GRAPHICS IMAGING GMBH
Filed by Esko-Graphics Imaging GmbH, Itzehoe (DE)
Filed on Sep. 4, 2019, as Appl. No. 16/559,702.
Application 16/559,702 is a continuation in part of application No. 16/433,873, filed on Jun. 6, 2019.
Application 16/433,873 is a continuation in part of application No. PCT/EP2019/052536, filed on Feb. 1, 2019.
Claims priority of provisional application 62/653,972, filed on Apr. 6, 2018.
Prior Publication US 2020/0016916 A1, Jan. 16, 2020
Int. Cl. B41N 1/12 (2006.01); B41C 1/05 (2006.01); B41M 1/04 (2006.01)
CPC B41N 1/12 (2013.01) [B41C 1/05 (2013.01); B41M 1/04 (2013.01)] 31 Claims
OG exemplary drawing
 
1. A process for making a flexo plate, the process comprising providing non-printing indicia disposed on a floor of the plate using areas of presence and absence of polymer in the plate floor, wherein the non-printing indicia are disposed on a floor of the plate, the process comprising:
forming the non-printing indicia via exposure to actinic radiation from a back, non-printing side of the plate, including providing a primary back exposure and an additional back exposure, the primary back exposure provided by a first exposure source and the additional back exposure performed by a second exposure source, wherein the non-printing indicia comprise areas of presence of polymer raised above the plate floor, and the process comprises forming the plate floor using the primary back exposure, and forming the areas of presence of polymer raised above the plate floor in the non-printing indicia using the additional back exposure.