Method and apparatus for processing presensitized lithographic printing plate
US5217848A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 1991 |
| Grant date | Jun 8, 1993 |
| Priority date | — |
| Expiry date | Oct 25, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F7/3078
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.