<title>Laser plate printing system using TiO<formula><inf><roman>2</roman></inf></formula> photoreceptor</title>

Abstract

The halftone dot image formed on a Titanium Dioxide (TiO<SUB>2</SUB>) photoreceptor with liquid toner has high resolution and sufficient sharpness. We have applied these materials to the graphic arts industry in two ways: one is the application to a direct digital color proofing (DDCP) system, the other is to a direct digital plate printing (DDPP) system. In the DDPP system, dot image is directly recorded on a TiO<SUB>2</SUB> photoreceptor (TiO<SUB>2</SUB> press plate) without using dot film. The exposure light source is an He-Ne laser which is the same light source as that of the DDCP system. Therefore, a proofing image and color separation press plates are produced using the same apparatus and materials. In offset printing, a TiO<SUB>2</SUB> press plate is capable of producing a high quality print. Dots on the paper have fine shape and uniform density distribution. The quality is little affected by the increase of fountain solution. The TiO<SUB>2</SUB> press plate is also applicable to high quality color printing because of its consistent printing quality and high stability of plate size.