Photocopying – Contact printing – Exposing on sensitized printing press plate or cylinder
Patent
1980-10-06
1984-10-09
Welsh, John D.
Photocopying
Contact printing
Exposing on sensitized printing press plate or cylinder
355 78, 264299, 430 30, G03B 2704
Patent
active
044758103
ABSTRACT:
An improved apparatus for the preparation of photopolymerized relief image plates is disclosed in which a series of indicators are used to indicate that the liquid photopolymerizable material is prepared for exposure to actinic radiation. Such detection may be accomplished by the closure of electrically energized indicator circuits used to detect when a top cover is in position over a layer of liquid photopolymerizable material. In addition, the actinic radiation may be activated directly by the closure of such circuits. Also disclosed is a method by which the time required for the top cover to come to rest in position over the photopolymerizable layer can be measured, and this measurement may then be used as a control to determine if a sufficient amount of photopolymerizable material to make an acceptable relief image plate was deposited on the platemaking surface.
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Hercules Incorporated
Staves Marion C.
Welsh John D.
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