Coated sand (coated sand). I.e. before molding sand surface covered with a layer of solid resin film molding sand or core sand. There are two methods of cold and hot coating process: Cold method using the resin is dissolved in ethanol and added methenamine in sand process, so that the two surfaces coated sand, volatile ethanol, was coated sand; hot Method The sand is preheated to a certain temperature, adding resin to melt, stirring the surface of the resin coated sand coated sand equipment, adding an aqueous solution of hexamine and lubricants, cooling, crushing, screening was coated sand. For steel, cast iron coated sand mainly uses high-quality selection of natural quartz sand as raw sand, thermoplastic phenolic resin, methenamine and enhancer for raw materials. Depending on the technology needs of users Shandong coated sand regeneration, the curing speed, stripping, mobility, collapsibility, the casting surface finish, storage and other aspects of appropriate adjustments to match. Is one of the cars, tractors, hydraulic parts and other materials the best shape. Phenolic resin sand regeneration is based on the principle of regeneration of waste sand at high temperatures, enabling crystal-shaped silicon oxide silica sand - the structural variants in the same quartz crystal transformation from α β crystal form, reducing the thermal expansion coefficient of silica sand. Reclaimed sand used, can reduce the deformation of the casting, burrs and other defects. When the regeneration of waste sand coated sand regeneration, but also makes the surface of the resin film burning sand and silica impurities such as metal oxides peel, improve silicon-oxygen bond active silica sand. When can improve regeneration instead of the original sand coated sand coated sand production, increased sand strength to prevent sticky sand casting and porosity. Shandong coated sand coated sand regeneration regeneration _ _ provided by Qingdao Qingdao Heng Heng Machinery Co., Ltd. Qingdao Heng Machinery Co., Ltd. (www.thjidian.com) strong, credible, Shandong Qingdao Cleaning equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Qingdao Heng and you hand into the brilliant, for a better future!