Flexographic printing cylinders and sleeves with cylindrical, seamless photopolymer printing layer, photopolymer composition therefor, and method of making said cylinders and sleeves from said composition

摘要

A liquid photopolymer composition having a predefined viscosity in the range of 25 to 35 centipoises such that it can be sprayed onto a rotating cylindrical core to form a seamless, cylindrical surface in the range of 60 to 70 Shore A hardness suitable for imaging the printing matrices of a flexographic printing sleeve, the composition comprising: a photopolymer of Shore D hardness in the range of 50 to 70; a carrier solvent; a grafted monomer to reduce the hardness to a range of 60 to 70 Shore A; and at least one of the following materials: monomers, photoinitiators, and photosensitizers.