Coated dummy plates

Details Coated dummy plates Coated dummy plates

1998-07-30

2000-04-11

Yamnitzky, Marie

Stock material or miscellaneous articles

Composite

Of metal

428336, 428457, 4284722, 428913, 427156, 427327, 427379, 427384, 427402, B32B 1504, B05D 300, B41N 100

Patent

active

060486244

ABSTRACT:
A dummy plate is provided for offset printing which essentially consists of a plate-, sheet- or band-form, mechanically and/or electro-chemically roughened, anodically oxidized and optionally hydrophilized aluminium support and a non-photosensitive, water-soluble protective layer applied thereto, characterized in that the layer contains a water-soluble organic compound which contains at least one OH- or NH-acidic group having a pKa value of .ltoreq.8 as acid or salt, and has a layer thickness which is smaller than the average roughness ra of the support material, determined by optical means. Even after extended storage at elevated temperature, the dummy plate can easily be used without an additional development step and exhibits no tendency to stick.

REFERENCES:
patent: 5474885 (1995-12-01), Michiels et al.
patent: 5786127 (1998-07-01), Madoux et al.
patent: 5908706 (1999-06-01), Lehmann et al.

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