Verwendung eines aufschäumbaren Materials zur Herstellung einer Druckform für den Hochdruck, insbesondere für den Flexodruck, und Vorrichtung zur Herstellung der Druckform

摘要

A relief printing forme comprises a substrate coated with a composition comprising a polymeric material and a propellant wherein the composition is expanded in selected areas to form a relief printing image. The composition may be applied to the surface of a printing forme cylinder (12) in a printing machine (11) by means of a coating device (18) and then selectively expanded by an imaging device e.g. a laser or heatable pin electrode. Alternatively, an activator or inhibitor may be selectively printed on the composition by ink jet, and the composition heated by an IR heater (19). The composition may be removed after printing by chemical or thermal softening or by embrittlement with dry-ice jets. <IMAGE>