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United States Patent 5,785,840
Sondergeld Jul. 28, 1998

Process for producing a surface structure for a cylinder of a printing machine
Inventors: Sondergeld; Werner (Offenbach, DE).
Assignee: Man Roland Druckmaschinen AG (DE).
Appl. No.: 638,540
Filed: Apr. 26, 1996

Foreign Application Priority Data
Apr. 26, 1995 [DE] 195 15 394.4
Intl. Cl. : C25F 3/02, H01R 43/00, B05D 3/00, B23K 26/06
Current U.S. Cl.: 205/640; 205/666; 205/674; 216/11; 216/52; 219/121.73; 250/492.3; 29/895.32; 427/271; 427/272; 427/274
Field of Search: 205/69, 640, 666, 649; 216/52; 156/645.1; 427/271, 272, 274, 282, 287

References Cited | [Referenced By]

U.S. Patent Documents
4,073,710Feb., 1978Visser 205/666 X
5,102,744Apr., 1992Wirz et al. 205/69 X

Foreign Patent Documents
2 030 013Jan., 1971DE
28 20 549 A1Jan., 1979DE
40 31 860 C2Jul., 1992DE
Primary Examiner: Valentine; Donald R.
Attorney, Agent or Firm: Leydig, Voit & Mayer, Ltd

Abstract

The present invention relates to a process for producing a surface structure, preferably on a cylinder, cylinder dressing, or roller of a printing machine, with a hard chromium coating which is galvanically produced and preferably ground to dimensional accuracy. The object of the invention is to develop a process which permits a surface structure to be produced on the hard chromium coating, which surface structure permits relatively high frictional forces between the contact points of the printing material and the coating of the cylinder of the printing machine. This is achieved in that the surface structure is produced in two process steps in sequence, a surface part structure being produced as a dot screen in an approximately even random distribution by means of a first material erosion process in a first process step, and the final surface structure being produced in a second process step by means of a second material erosion including the dot screen.

11 Claims, 1 Drawing Figures

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