Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Making printing plates
Patent
1997-03-27
1999-11-23
Hamilton, Cynthia
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Making printing plates
430269, 4302711, 430306, G03F 716, G03F 726
Patent
active
059897805
ABSTRACT:
Printing plates are formed from a layer of photo polymerizable resin by a process and assembly which includes a negative of the image or images to be formed in the printing plate. The negative is placed on a lower glass support plate and a bank of lights is disposed below the lower glass support plate. A cover film is laid down on the negative, and a very thin layer of resin, called a cap resin, is deposited on the cover film. A layer of the resin to be cross-linked is deposited on the cap resin layer, and the cross-linked resin layer is covered with a polyester sheet, on the top of which an upper glass plate is lowered. The cap resin layer and the cross-linked resin layer are both laid down on the lower glass plate assembly by meas of a carriage assembly that traverses over the lower glass plate assembly, and which carries the cross-linking resin and cap resin reservoir. The thickness of the cross-linked resin layer varies widely, while the thickness of the cap resin layer is narrowly confined. The carriage assembly is provided with a cap resin doctor blade that is maintained a constant distance above the lower glass plate, irregardless of the spacing between the cross-linked resin layer reservoir on the carriage assembly and the lower glass plate. In this manner, a constant thickness cap resin layer can be deposited on the lower glass plate in conjunction with different thickness cross-linking resin layers.
REFERENCES:
patent: 4056423 (1977-11-01), Hughes
patent: 4383759 (1983-05-01), Bloothoofd et al.
patent: 4638758 (1987-01-01), Bloothoofd
patent: 5348605 (1994-09-01), Hughes et al.
Hamilton Cynthia
MacDermid Imaging Technology Incorporated
Simons William A.
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