On the press development of a diazo based printing plate
US5776654A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1996 |
| Grant date | Jul 7, 1998 |
| Priority date | — |
| Expiry date | Sep 30, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F7/016
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
According to the present invention there is provided a method for making a lithographic printing plate comprising the steps of: PA1 (1) image-wise exposing an imaging element having on a plastic film support in the order given (i) a uniform ink-repellant layer comprising a cross-linked hydrophilic binder and (ii) a photosensitive layer comprising a diazonium salt or a diazo resin; PA1 (2) and developing a thus obtained image-wise exposed imaging element by mounting it on a print cylinder of a printing press and supplying an aqueous dampening liquid and/or ink to said photosensitive layer. The present invention also provides a method for making multiple copies of an original comprising the steps of: PA1 (1) image-wise exposing an imaging element having on a plastic film support in the order given (i) a uniform ink-repellant layer comprising a cross-linked hydrophilic binder and (ii) a photosensitive layer comprising a diazonium salt or a diazo resin; PA1 (2) mounting a thus obtained image-wise exposed imaging element without development, on a print cylinder of a printing press; PA1 (3) rotating said print cylinder while supplying an aqueous dampening liquid and/or supplying ink to s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.