means to lubricate the inside of the maschinensiebe of langsiebpapiermaschinen

摘要

977,094. Lubricating and cleaning Fourdrinier wires by chemical means. MALCO CHEMICAL CO. Sept. 20, 1962 [Dec. 22, 1961], No. 35809/62. Heading D2A. The working life of the wire of a Fourdrinier paper making machine is extended by applying to the return run of the wire while in operation a dilute aqueous solution of a combination of chemicals comprising: (a) 5%-97. 99% by weight of a water soluble extreme pressure lubricant comprising a nitrogen-containing heterocyclic compound characterised by a ring nitrogen bonded to a ring carbond to which is bonded a sulphydryl group, (b) 2%-92% by weight of a dispersant-from the group consisting of water-miscible non-quaternary cationic dispersants and salts thereof which contain at least one but not more than two aliphatic groups of at least six carbon atoms in chain length and (c) 0. 01%-5% by weight of a water dispersible, organic, silicon-containing compound from the group consisting of organo-silicon oxide condensation products and organo-functional silanes. The solution which is preferably applied by sprays 17 to the return run of the wire immediately prior to the breast roll is supplied in quantities sufficient to provide at least 0.005 pounds of the combined chemicals per ton, dry weight, of paper produced by the machine, and serves both to lubricate the wire as it passes over suction boxes and the like and to prevent blockage of the open areas of the wire mesh by improving drainage characteristics.