METHOD FOR COATING A PRINTING PRESS CYLINDER
A method for coating a printing press cylinder, namely a plate cylinder or a transfer cylinder, is disclosed. In an embodiment, the method includes providing a printing press cylinder with a metallic cylinder basic body, which has an outer surface area and at least one lockup slot, and applying a coating containing nickel to the cylinder basic body in the region of the outer surface area as well as in the region of the, or each, lockup slot by autocatalytic and/or chemical deposition.
1 . A method for coating a printing press cylinder, namely a plate cylinder or a transfer cylinder, comprising:
a) providing a printing press cylinder with a metallic cylinder basic body, which has an outer surface area and a lockup slot; and
b) applying a coating containing nickel to the cylinder basic body in a region of the outer surface area and in a region of the lockup slot by autocatalytic and/or chemical deposition.
2 . The method according to claim 1 , wherein an alloy containing nickel and phosphorous is applied to the cylinder basic body by the autocatalytic and/or chemical deposition.
3 . The method according to claim 1 , wherein the autocatalytic and/or chemical deposition takes place in such a manner that the applied coating containing nickel has a thickness of at least 15 μm.
4 . The method according to claim 3 , wherein the applied coating containing nickel has a thickness of at least 25 μm.
5 . The method according to claim 1 , wherein following step b), a coating containing chromium is applied to the coating containing nickel at least in the region of the outer surface area of the cylinder basic body.
6 . The method according to claim 5 , wherein the coating containing chromium is applied by electrodeposition in at least one layer on the cylinder basic body.
7 . The method according to claim 5 , wherein the coating containing chromium is applied exclusively in the region of the outer surface area of the cylinder basic body.
8 . The method according to claim 6 , wherein the electrodeposition takes place in such a manner that the coating containing chromium applied by electrodeposition has a thickness of at least 15 μm.
9 . The method according to claim 8 , wherein the coating containing chromium applied by electrodeposition has a thickness of at least 30 μm.
10 . The method according to claim 6 , wherein several layers of chromium are applied on the cylinder basic body by electrodeposition in such a manner that each layer has a thickness of at least 10 μm.
11 . The method according to claim 1 , wherein a layer of hot chromium and at least one layer of hard chromium are applied by electrodeposition.
12 . The method according to claim 1 , wherein several layers of hard chromium are applied by electrodeposition.
13 . A printing press cylinder, namely a plate cylinder or a transfer cylinder, having a metallic cylinder basic body, which has an outer surface area and a lockup slot, wherein the cylinder basic body is coated in a region of the outer surface area and in a region of the lockup slot by autocatalytic and/or chemical deposition with a coating containing nickel, and wherein a coating containing chromium is applied to the coating containing nickel at least in the region of the outer surface area of the cylinder basic body by electrodeposition.
14 . A method for coating a printing press cylinder, comprising:
a) providing a printing press cylinder with a metallic cylinder basic body, which has an outer surface area and a lockup slot;
b) applying a coating containing nickel to the cylinder basic body in a region of the outer surface area and in a region of the lockup slot by autocatalytic and/or chemical deposition; and
c) applying a coating containing chromium to the coating containing nickel at least in the region of the outer surface area of the cylinder basic body;
wherein no refinishing step is performed after the coating steps.