Abstract: A distributor or transfer roller is provided for printing machines, in particular for offset printing machines. The roller has at least a substantially rigid core and a cover made of a polymeric material applied on and permanently fixed to the core. The cover is applied directly on the core or on a hard-elastic intermediate layer having a hardness of ?10 Shore D, optionally by an adhesion promoting layer. The cover is at least substantially made of a fluorinated polymer and has a hardness of ?15 Shore D and/or a scratch hardness according to ISO 15184 of 6B or harder. The polymeric material can be a duroplastic material, a fluorinated polyurethane resin, polyester resin, epoxy resin, acrylate resin and/or polyether resin, a highly cross-linked non-elastic fluoropolymer, a fluorothermoplastic, a polymeric non-elastic fluorosilicone, or a fluoropolymer lacquer.

Abstract: The invention relates to the use of a roller or a rubber blanket with a covering made of elastomeric material with an outer surface for indirect or direct transfer of a damping solution and/or a printing agent to a print carrier of a printing press. In order to enable a virtually optimum printing result, even in the presence of changing process conditions, and to display improved back-transfer properties with unchanging properties over the service life, it is proposed that a roller/rubber blanket be used which has an outer surface that constitutes an elastomeric surface coating of the covering and contains, or completely consists of, a fluoroelastomer, particularly an elastomeric fluorinated rubber. The fluorinated rubber can, in particular, be a tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride copolymer.

Abstract: A printing press includes inking units having rollers provided with a phobic coating made of a material of low surface energy. At least one roller of the inking unit remains uncoated. Ink residues are stripped off the uncoated roller and removed by a blade during a cleaning operation. A method of removing ink from an inking unit of a printing press is also provided.

Abstract: The invention relates to the use of a roller or a rubber blanket with a covering made of elastomeric material with an outer surface for indirect or direct transfer of a damping solution and/or a printing agent to a print carrier of a printing press. In order to enable a virtually optimum printing result, even in the presence of changing process conditions, and to display improved back-transfer properties with unchanging properties over the service life, it is proposed that a roller/rubber blanket be used which has an outer surface that constitutes an elastomeric surface coating of the covering and contains, or completely consists of, a fluoroelastomer, particularly an elastomeric fluorinated rubber. The fluorinated rubber can, in particular, be a tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride copolymer.

Abstract: The invention relates to a roller for fluid film preparation, such as for offset printing, having an inside core, a first layer which surrounds the core and has a first hardness, and a second layer which surrounds first layer A and has a second hardness different from that of the first layer. The roller coating, including the first and second layers, is provided, at least in certain sections, with an essentially continuous hardness gradient through the layer thickness. The hardness gradient can be produced by incorporating a gradient of a hardness-modifying substance or agent, or a precursor thereof, e.g. an agent that increases the degree of cross-linking, by means of diffusion or migration of the substance or agent from at least one surface of the roller coating.

Abstract: The invention relates to a roller for fluid film preparation, having an inside core (3), a first layer A, which surrounds the core and has a first hardness, and a second layer B, which surrounds first layer A and has a second hardness different from that of the first layer, where the two surround the core with a layer thickness d. In order to design a roller for fluid film preparation, particularly for offset printing, with which inhomogeneities in the printing medium or printed product, particularly ribbing on the printed product, can be at least largely avoided, and which is cost-efficient to manufacture, it is proposed that the roller coating be provided, at least in certain sections, with an essentially continuous hardness gradient through the layer thickness (dV). In order to produce the hardness gradient, a gradient of a hardness-modifying substance or agent, or a precursor thereof, e.g.