PHOTOSENSITIVE, FLEXO PRINTING ELEMENT AND METHOD FOR THE PRODUCTION OF NEWSPAPER FLEXO PRINTING PLATES

摘要

The invention relates to a photosensitive printing element for the production of flexo printing plates for newspaper printing, comprising at lest one flexible metal support, an adhesive layer applied on said support, an organically developable, photopolymerizable layer, a transparent substrate layer and optionally a removable protective foil, wherein the total thickness of the flexo printing element measures 300 to 1000 mu m, the elastomer binding agent has an average weight MW of between 80 000 to 150 000 g/mol and a Shore A hardness of between 50 to 80, wherein the amount of softening agent ranges from 5 to 50 percent by weight in relation to the amount of all components of the photopolymerizable layer. The invention also relates to a method for the production of newspaper flexo printing plates by imagewise exposure of the flexo printing element to actinic light, development and drying at 105 to 160 DEG C.