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 coated sand surface coated sand volatile renewable ethanol manufacturers, too coated sand; thermal preheating the sand to a certain temperature, add melted resin coated sand regeneration, mixing the resin coated sand surface coated sand recycling machinery, plus methenamine solution 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, 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. Quality coated sand core in addition to the geometry, dimensional accuracy, surface quality and shell thickness of the sand core, the sand core but also by observing the color of cured core sand test case. The normal situation is that the appearance of the sand core should be uniformly brown, center yellow, when burnt brown and even black exterior rendering, insufficient hardening look yellow, white center with Sand cast iron main process parameters: Iron type wall thickness 25mm, covered sand thickness 5-8mm (for small bore ductile iron crankshaft); iron-type quality in general is about five times the mass of castings; iron ore ratio (casting quality and the consumption ratio of the amount of coated sand) 6-7. Iron-type cladding sand molding methods (ie sand overlying obtained) has shot molding and compression molding sand two, the former is currently used more, for ordinary coated sand coated sand, particularly suitable for mass production; the latter suitable for single-mass (iron type size up to several meters in length) of the crankshaft, etc., covering a variety of fluidized sand Sand. The former sand shot selection pressures related to the thickness of the coated sand, sand shot when the pressure is 0.2-0.6MPa, coated sand thickness of 4-5mm, its densest coated sand coated sand regeneration regeneration line _ _ Qingdao Heng by Heng Machinery Co., Ltd. Qingdao. 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!