Abstract: A system for exposing a heat and/or light sensitive printing plate precursor including a coating on a support includes a platesetter including a laser head for generating a laser beam to create an image, and the platesetter further includes an electrostatic generator capable of electrostatically charging the surface of the coating.

Abstract: A system for exposing a heat and/or light sensitive printing plate precursor including a coating on a support includes a platesetter including a laser head for generating a laser beam to create an image, and the platesetter further includes an electrostatic generator capable of electrostatically charging the surface of the coating.

Abstract: An apparatus is disclosed for evaluating the triboelectrical properties of at least two samples, comprising a grounded means (1) for holding a material in sheet form comprising a support provided on at least one surface thereof with at least two samples each in at least one predefined region thereof; a charging means (4) for tribocharging the at least two samples; and a means (7) for measuring an electrical property of the at least two samples. A method for evaluating an array of multiple samples on their triboelectrical properties with such an apparatus is also disclosed.

Abstract: The present invention provides a method for obtaining a lithographic base comprising on a hydrophobic support a hydrophilic layer contiguous to said support containing a non-gelatinous hydrophilic (co)polymer or (co)polymer mixture, characterized in that said hydrophobic support is treated with a plasma treatment with an applied power density during the plasma treatment of at least 70 W min/m.sup.2 before applying to said support said hydrophilic layer.