| 摘要 |
PURPOSE:To obtain an original plate for printing which wedges itself less into corrugated boards, permits printing on non-woven fabrics as well and provides sharp prints by interposing a negative film and a screen having many spotlike light transmittable part of specific density between a light source and a photosensitive resin and exposing the same. CONSTITUTION:In the stage of exposing the parts of a photosensitive resin 5 to be formed with printing areas 1 and hardening said parts, a negative film 6 imprinted thereon with characters, symbols, patterns, etc. to be printed and a screen 7 having many spotlike light transmittable parts are interposed between said resin and a light source 8, and light is projected from said light source to the resin 5. If the unexposed parts of the exposed resin 5 are washed away, an original plate for printing having fine dots 3 in the printing areas 1 is obtained. On account of the presence of the screen 7, many fine dots are formed in the printing areas at 100-300 lines/in line number, 3-50% surface density with respect to the printing areas and 5-200mu height. |
