| 摘要 |
PROBLEM TO BE SOLVED: To provide a block copy sheet for a lithographic printing plate which is aimed at preventing positional slippage of the lithographic printing plate on a plate cylinder of a printing machine. SOLUTION: In a block copy sheet for a lithographic printing plate which is interposed between a plate cylinder and the lithographic printing plate of which the rear is constituted of a material other than metal, projections in a required shape which are brought into pressure contact with the rear of the printing plate so as to depress the rear are provided on the surface of the sheet, and the area of contact of the projections with the rear of the printing plate is in the range of 0.6-3.0% of the area of the rear, while the projections are formed of nonspherical fillers of the average length 1-200μm.
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