Apparatus and method for making a lithographic printing plate according to silver salt diffusion transfer processing
US5740489A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 1996 |
| Grant date | Apr 14, 1998 |
| Priority date | — |
| Expiry date | Jun 13, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03D3/132
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An apparatus and a method for making a lithographic printing plate by silver salt diffusion transfer processing, comprising means for informationwise exposing an imaging element (5) comprising on a support in the order given a silver halide emulsion layer and a layer comprising physical development nuclei: means for processing a thus obtained informationwise exposed imaging element using a processor comprising a developing unit (120), the developing unit comprising (i) a tank holding an alkaline processing liquid, (ii) a plurality of guide rollers (50) and guide plates (121 to 126) for transporting and guiding the informationwise exposed imaging element in a transport direction X through the alkaline processing liquid characterised in that at least one of the guide plates (121 to 126) exhibits a plurality of apertures (150) to allow the alkaline processing fluid to pass evenly near the surface of the imaging element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.