Grained and anodized aluminum substrate for lithographic printin

Details Grained and anodized aluminum substrate for lithographic printin Grained and anodized aluminum substrate for lithographic printin

1997-11-06

1998-11-10

Young, Christopher G.

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

428337, 428469, 4284722, 428650, 428687, 4302781, 148437, B32B 1510

Patent

active

058341293

ABSTRACT:
The present invention relates to supports for lithographic printing plates and to a process for producing the same. In particular, the invention relates to aluminum plates having an electrochemically grained and anodized surface which is has a smooth, shiny surface and hence greater image contrast when a lithographic image is formed thereon. The surface has a substantially uniform surface topography comprising peaks and valleys and surface roughness parameters wherein Ra ranges from about 0.10 to about 0.50 microns, Rz ranges from about 0.00 to about 5.00 microns, Rt ranges from about 0.00 to about 6.00 microns and Rp ranges from about 0.00 to about 4.00 microns. The surface preferably has tristimulus color coordinate values wherein L ranges from about 35.00 to about 75.00, a ranges from about -4.00 to about +4.00 and b ranges from about -4.00 to about +4.00.

REFERENCES:
patent: 4087342 (1978-05-01), Takahashi et al.
patent: 4336113 (1982-06-01), Walls et al.
patent: 4374710 (1983-02-01), Walls
patent: 4396468 (1983-08-01), Walls
patent: 4416972 (1983-11-01), Walls et al.
patent: 4655136 (1987-04-01), Reiss et al.

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