Method of controlled laser imaging of zirconia-alumina composite

Details Method of controlled laser imaging of zirconia-alumina composite Method of controlled laser imaging of zirconia-alumina composite

1997-05-01

1999-04-13

Funk, Stephen R.

Printing

Planographic

Lithographic plate making, and processes of making or using...

101478, B41C 110

Patent

active

058933280

ABSTRACT:
Reusable lithographic printing members are prepared from a ceramic that is a composite of a zirconia alloy and .alpha.-alumina. In use, a printing surface of the zirconia-alumina composite ceramic is imagewise exposed to electromagnetic radiation such as from a laser under controlled conditions to provide localized "melting" of the zirconia alloy in the exposed areas. Those areas are transformed from a hydrophilic to an oleophilic state or from an oleophilic to a hydrophilic state, thereby creating a lithographic printing surface that is hydrophilic in non-image areas and is oleophilic and thus capable of accepting printing ink in image areas. Such inked areas can then be used to transfer an image to a suitable substrate in lithographic printing. The printing members are directly laser-imageable as well as image erasable, and can include printing plates, printing cylinders, printing tapes and printing sleeves.

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