RELIEF PRINTING PLATE, PLATE-MAKING METHOD FOR THE RELIEF PRINTING PLATE AND PLATE-MAKING APPARATUS FOR THE RELIEF PRINTING PLATE

摘要

According to an aspect of the invention, on the relief printing plate where a relief serving as a halftone dot is formed on a surface of a plate material, an elliptical frustoconical relief is formed as the relief as well as the minor direction of the elliptical frustum matches the printing direction so that the longitudinal section of the relief in the same direction as in the printing direction is smaller than the longitudinal section of the relief in a direction orthogonal to the printing direction. Thereby, the relief having the aforementioned sectional shape has resistance to pressure as a whole of the relief as well as flexibility in the printing direction.