Method of making gravure printing plates
Reference is made to photogravure plates of the kind in which the image to be printed is represented by an intaglio cell pattern on the surface of the printing plate, the cells being regularly distributed and of uniform size in plan but of varying depth according to the required density of the print at any given point--the deeper the cell the more ink it will contain and therefore the more dense the print image will be at that point. The method described for making a gravure printing plate comprises the steps of producing in one surface of a layer of resinous material that is hardenable by irradiation a pattern of hardened cell walls, and an image in irradiation resistant material, and then irradiating the material, followed by removal of the unhardened material from within the cells. The irradiation resistant material may contain a silver halide, producing a silver image on development. Suitable resinous materials are indicated. The cell pattern may be produced by exposing the surface to hardening radiation through a negative screen bearing a pattern of discrete opaque areas representing the cells, separated by transparent regions representing the cell walls. The surface layer may be applied by roller and the irradiation conducted during rotation of the roller from a source located within the interior of the roller. Various alternative methods of application of the process are described. (UK)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-29-005265
- OSTI ID:
- 4404969
- Report Number(s):
- GB 1325874
- Resource Relation:
- Patent File Date: 1969 Aug 13; Other Information: Orig. Receipt Date: 30-JUN-74; Bib. Info. Source: UK (United Kingdom (sent to DOE from))
- Country of Publication:
- United Kingdom
- Language:
- English
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