| 摘要 |
PURPOSE:To obtain a halftone gravure printing plate which is improved in the transferability of ink in highlight parts, is improved in gray level gradation degree and is capable of eliminating the moires generated in medium contrast part from the highlight parts when color printing is executed by lapping of plates separated to three colors or four colors. CONSTITUTION:The rhombic cells from the highlight parts to the shadow parts are formed to incline at 90 deg. in the intersecting angle of the right diagonal arranging direction and left diagonal arranging direction of these sells and at the intersecting angle of the right diagonal arranging direction and doctor contact line direction smaller or larger by the required angle than a standard angle 45 deg.. The one diagonal line direction of the cells of the medium contrast parts from the highlight parts of a dot per cent of about 7 to 8% to about 50% is formed to be a direction orthogonal with the doctor tangent line direction. In addition, the one side of the cells of the shadow parts aligns to the right diagonal arranging direction of the rhombic cells described above. |
