Method for retouching an electrophotographic offset master plate
Abstract
Abstract AN ELECTROPHOTOGRAPHIC OFFSET MASTER PLATE CAN BE RETOUCHED BY APPLYING A SOLUTION TO AREAS OF THE PLATE WHICH ARE TO BE DELETED FROM PRINTED PRODUCTS, PRIOR TO RENDERING NON-IMAGED PORTIONS INK-REPELLENT. THE SOLUTION CONTAINS METAL COMPOUND WHICH REACTS WITH RENDERING SOLUTION (WHICH RENDERS THE NON-IMAGED PORTIONS INK-REPELLENT AND WATER-RECEPTIVE) COMPRISING WATER SOLUBLE METAL SALT OF HEXACYANO METALLIC ACID AND/OR AMMONIUMPHOSPHATE TO PRODUCE HYDROPHILIC WATER INSOLUBLE PRECIPITATES. IN SPITE OF UNIFORM WIPING OF THE SURFACE WITH RENDERING SOLUTION, THE IMAGED PORTIONS ARE STILL OLEOPHILIC WHILE NON-IMAGED PORTIONS BECOME HYDROPHILIC. THIS IS BECAUSE THAT NEAR THE NON-IMAGED SURFACE THERE EXIST MATERIALS WHICH REACT WITH RENDERING SOLUTION TO FORM HYDROPHILIC AND WATER INSOLUBLE PRECIPITATES E.G. K2ZN3(FE(CN)6)2, ANNH4PO4 ETC., WHILE NEAR THE IMAGED SURFACE SUCH MATERIALS DON''T EXIST.
Inventors
- 👤 Koji Uchida
- 👤 Sadao Kuriu
Bibliographic Details
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