Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – To produce printing surface
Patent
1990-03-27
1991-01-15
Goodrow, John
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
To produce printing surface
430 44, G03G 1301
Patent
active
049853228
ABSTRACT:
The process and apparatus for producing printing plates of this invention are for optically color separating a transmitted light or reflection light from a color original (1) and producing color-separated printing plates (18) each having each different color by the color-separated light. Hitherto, each color-separated printing plate of each color is produced by photographing a color-separated light, i.e., color-separated images using a photographic film such as an expensive silver salt photographic film, etc., and printing the color-separated images thus photographed using the photographic film as an intermediate onto a printing plate such as a pre-sensitive printing plate, etc. On the other hand, in this invention, each color-separated printing plate (18) is directly produced from a color original without using a photographic film such as an expensive silver salt photographic film as an intermediate by using an organic photoconductive material having a whole light wavelength of from 400 n.m. to 700 n.m. as an original printing plate (9), using an electrophotographic process, light-exposing the charged original printing plate (9) with color-separated light formed by optically color separating a transmitted light or reflected light from a color original (1), forming toner images on the light-sensitive (photoconductive) layer of the original printing plate (9), fixing the toner images, and removing the non-image portions of the light-sensitive layer of the original printing plate (9) or rendering the non-image portion hydrophilic.
REFERENCES:
patent: 4281051 (1981-07-01), Sakai
patent: 4686163 (1987-08-01), Ng et al.
patent: 4708459 (1987-11-01), Cowan et al.
Azami Kyoichiro
Kume Shouji
Dainippon Ink and Chemicals Inc.
Goodrow John
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