Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Making printing plates
Patent
1987-10-19
1988-09-27
Brammer, Jack P.
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Making printing plates
430 22, 430302, 430394, 430494, G03C 700
Patent
active
047741651
ABSTRACT:
Disclosed is a direct making of multicolor printing plates by the procedure of exposing a photosensitive material (P) of the lithographic type for making a black plate to an original bearing both the continuous tone image and the line images. The said procedure comprises (1) exposure to the continuous tone image which is performed by exposing the sensitive material (P) through a contact screen to the original in which the line images are covered with a mask (M-1) having an optical reflectance of 2% or less and the continuous tone image is covered with a mask (M-2) having a large optical reflectance, then again exposing, in the absence of contact screen, the sensitive material (P) to the original in which the line images are covered with said mask (M-1), and the mask (M-2) for the continuous tone image is removed, and (2) exposure to the line images which is performed by exposing the sensitive material (P) to the original in which the continuous tone image is covered with the mask (M-1).
REFERENCES:
patent: 3776733 (1973-12-01), Lohmer et al.
patent: 4187107 (1980-02-01), Homma et al.
patent: 4262070 (1981-04-01), Liu
patent: 4565771 (1986-01-01), Lynch et al.
patent: 4610949 (1986-09-01), Kanada et al.
Ebara Kazuyuki
Hasegawa Kazuhito
Maruyama Isamu
Tatikawa Masaharu
Yamamoto Kyonosuke
Brammer Jack P.
Mitsubishi Paper Mills Ltd.
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