Block copy material for lithographic printing plate material, lithographic press and lithographic printing method

摘要

Disclosed is a block copy material for a lithographic printing plate material comprising a sheet-like substrate, on at least one side of which a plurality of minute projections are distributively formed, or a lithographic press having a plate cylinder, on a surface of which a plurality of minute projections are distributively formed, wherein the density of minute projections having a height of more than 40 mu m is 20 projections/cm<2> or less on surface average, and the density of minute projections having a height of 3 mu m or more is 25 projections/cm<2> or more on surface average. The block copy material for a lithographic printing plate material, the lithographic press and a lithographic printing method using the block copy material or the lithographic press can avoid the deterioration of the printing dimension and printing accuracy caused by strain partially developed in printing, and can solve the problem of conventional methods, the deterioration of the workability in printing.