Method for making a lithographic printing plate wherein an imaging element is used that comprises a thermosensitive mask
US5879861A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 16, 1997 |
| Grant date | Mar 9, 1999 |
| Priority date | — |
| Expiry date | Apr 16, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/145
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
According to the present invention there is provided a method for making a lithographic printing plate comprising the steps of: PA1 providing an imaging element comprising on a support having a hydrophilic surface a photosensitive layer and a thermosensitive layer, said thermosensitive layer being opaque to light for which said photosensitive layer has spectral sensitivity and said thermosensitive layer comprising an infrared pigment dispersed in a binder; PA1 mounting said imaging element on a drum; PA1 image-wise exposing said imaging element by means of an infrared laser in an internal or external drum configuration thereby ablating said thermosensitive layer and rendering it image-wise transparent; PA1 overall exposing said imaging element with light to which said photosensitive layer has spectral sensitivity; PA1 developing said imaging element to leave an ink accepting image of said photosensitive layer on said support.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.