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AssigneeKonica Corporation
InventorsMasafumi Uehara, Kazuhiro Shimura, Shinya Watanabe
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Disclosed are a method and an apparatus for processing with a developing solution repeatedly used, both an imagewise exposed, positive-working presensitized lithographic printing plate and an imagewise exposed negative-working presensitized lithographic printing plate. The plates each comprise an aluminum support and a light-sensitive layer formed thereon. A replenishing solution is added to the developing solution to compensate for the degradation of the developing solution brought about by development and/or by carbon dioxide in the air. The method comprises the steps of; measuring a reflection density of the light-sensitive layer of the printing plates to discriminate the type of the printing plate, selecting a predetermined developing condition according to the discriminated type of the printing plate, and developing the printing plates according to the selected developing condition.
A method for processing both an imagewise exposed, positive-working presensitized lithographic printing plate and an imagewise exposed negative-working presensitized lithographic printing plate, comprising developing the printing plates by repeatedly using a developing solution, comprising a single aqueous, alkaline developing solution capable of developing both an imagewise exposed, positive-working presensitized lithographic printing plate and an imagewise exposed, negative-working presensitized lithographic printing late, the printing plates comprising an aluminum support and a light-sensitive layer formed thereon, a replenishing solution being added to the developing solution to compensate for the degradation of the developing solution brought about by development and/or by carbon dioxide in the air, comprising the steps of;
A method for processing both an imagewise exposed, positive-working presensitized lithographic printing plate comprising an aluminium support and a light-sensitive layer of o-naphthoquinonediazide formed thereon and an imagewise exposed, negative-working presensitized lithographic printing plate comprising an aluminium support and a light-sensitive layer of a diazo resin formed thereon, comprising developing the printing plate with a single developing solution repeatedly used containing an alkali metal silicate, a replenishing solution containing an alkali metal silicate being added to the developing solution to compensate for the degradation of the developing solution brought about by development and/or by carbon dioxide in the air, comprising the steps of;
An apparatus for processing both an imagewise exposed, positive-working presensitized lithographic printing plate and an imagewise exposed, negative-working presensitized lithographic printing plate, comprising developing the printing plates by repeatedly using a developer, comprising a single aqueous alkaline solution capable of developing both an imagewise exposed, positive-working presensitized lithographic printing plate and an imagewise exposed, negative-working presensitized lithographic printing plate, the printing plates comprising an aluminum support and a light-sensitive layer formed thereon, comprising;
Dependencies are inferred from the claim text.