| 摘要 |
PURPOSE:To obtain a gravure print of high quality, by using a gravure screen larger in number of lines and black area rate as compared with conventional ones. CONSTITUTION:A gravure screen has white lines 8 in one direction smaller in width than the other white lines 7 having 9-20mum width and >=350 lines/inch, and the lines 8 having 0.1-0.5 times the width of the thicker lines 7, and the screen has >=56% black area rate. An image of this screen and that of lithographic or letterpress halftone positive are printed on a photoresist, such as carbon tissue, and an inverted halftone gravure printing plate is made by using this photoresist. As a result, a halftone positive having 150 lines/inch, 175 lines/inch, 200 lines/inch, 300 lines/inch, or more can be used and a print reproduced in fine gradation can be obtained. |
