Abstract:
Apparatus and methods for imaging lithographic plates using laser devices that emit in the near-infrared region, and plates suitable for imaging with the apparatus and methods. Laser output either ablates one or more plate layers or physically transforms a surface layer, in either case resulting in an imagewise pattern of features on the plate. The image features exhibit an affinity for ink or an ink-abhesive fluid that differs from that of unexposed areas.
Abstract:
A lithographic printing plate comprises an anodized aluminum support material, a radiation-sensitive layer and a hydrophilic subbing layer containing benzoic acid in an amount sufficient to improve the incubation stability of the plate.
Abstract:
Planographic printing plates and continuous planographic printing forms having a flexible foundation supporting a planographic printing layer and process of making are disclosed. The flexible foundation is an opaque, thin sheet or continuous web or strip of synthetic thermoplastic polymer having uniformly rough, receptive surfaces, the foundation being selected from unicellular foamed film or normally-clear, normally-smooth film treated on both surfaces with volatile organic solvent having a dissolving power therefor. One surface of the film foundation is coated with a thin planographic layer.