EP 0118740 B1 19890913 - PLATE, FOIL OR WEB-LIKE MATERIALS MADE OF MECHANICALLY AND ELECTROCHEMICALLY GRAINED ALUMINIUM, PROCESS FOR THEIR MANUFACTURE AND THEIR USE AS SUPPORTS FOR LITHOGRAPHIC PRINTING PLATES
Title (en)
PLATE, FOIL OR WEB-LIKE MATERIALS MADE OF MECHANICALLY AND ELECTROCHEMICALLY GRAINED ALUMINIUM, PROCESS FOR THEIR MANUFACTURE AND THEIR USE AS SUPPORTS FOR LITHOGRAPHIC PRINTING PLATES
Publication
Application
Priority
DE 3305067 A 19830214
Abstract (en)
[origin: US4655136A] Disclosed is a sheet, foil or strip material comprising aluminum or an alloy thereof, which is first mechanically and then electrochemically roughened on one or both surfaces to produce the following parameters: (a) from about 60 to 90% of the surface comprise a basic structure, in which the arithmetic mean of the distribution of diameters Da1 of the pits is in the range from about 1 to 5 microns, (b) from about 10 to 40% of the surface comprise a superimposed structure formed of elevations having an average base F from about 100 to 1,500 microns2, in which the arithmetic mean of the distribution of diameters Da2 of the pits is in the range from about 0.1 to 1.0 micron, (c) the center line average roughnesses Ra of the entire surface are at least 0.6 micron, and (d) the contact area tpmi of the entire surface is not more than about 20% at a stylus working depth of 0.125 micron and not more than about 70% at a stylus working depth of 0.4 micron. Also disclosed is a process for the production of this material and offset-printing plates which comprise a layer of this material provided with a radiation-sensitive coating.
IPC 1-7
IPC 8 full level
C23F 1/00 (2006.01); B41N 1/08 (2006.01); B41N 3/00 (2006.01); B41N 3/03 (2006.01); B41N 3/04 (2006.01); C23F 1/02 (2006.01); C25D 11/16 (2006.01); C25F 3/04 (2006.01)
CPC (source: EP US)
B41N 3/034 (2013.01 - EP US); B41N 3/04 (2013.01 - EP US); Y10T 428/12993 (2015.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI NL SE
DOCDB simple family (publication)
US 4655136 A 19870407; AT E46293 T1 19890915; AU 2426184 A 19850822; AU 573566 B2 19880616; BR 8400604 A 19840918; CA 1240951 A 19880823; DE 3305067 A1 19840816; DE 3479716 D1 19891019; EP 0118740 A2 19840919; EP 0118740 A3 19870204; EP 0118740 B1 19890913; ES 529693 A0 19850416; ES 8504027 A1 19850416; FI 82905 B 19910131; FI 82905 C 19910510; FI 840544 A0 19840210; FI 840544 A 19840815; JP H0676677 B2 19940928; JP S59182967 A 19841017; ZA 84821 B 19840926
DOCDB simple family (application)
US 57738184 A 19840206; AT 84101145 T 19840204; AU 2426184 A 19840208; BR 8400604 A 19840213; CA 446478 A 19840131; DE 3305067 A 19830214; DE 3479716 T 19840204; EP 84101145 A 19840204; ES 529693 A 19840213; FI 840544 A 19840210; JP 2207884 A 19840210; ZA 84821 A 19840203