Coated sand by Dr. Ke Luoning Germany during World War II invention, the process is powdered phenolic thermosetting resin sand mechanically mixed with the original, when heat cured. After developing into a thermoplastic phenolic resin plus the latent curing agent (hexamine) and a lubricant coating process through certain formulated as coated sand, sand coated with resin is melted in the surface of the coated sand when heated, in Ukraine Lotto coated sand products under the decomposition of methylene role coated sand regeneration, the molten resin into a rapid transition from the linear structure of the body structure is not melted, so that the coated sand curing. Making entity core coated sand core entity theory regeneration equipment company, coated sand can produce almost all types, especially high-precision castings. When using the wet coated sand, direct access to hot-box core making equipment and tooling coated sand regeneration plant, without the original equipment and tooling to make any changes. When using dry coated sand, because of its mobility, the need for core box exhaust system, nozzle and core box seals for special treatment. Angle of repose principle can be used (coated sand repose angle of about 30o), coated sand into the sand shot resolved when the exhaust chamber and shoot do not shoot automatically when the sand coated sand whereabouts and other issues. Currently, the use of dry heat coated sand box core technology manufacturers a more raw sand, sand is mainly composed of the original coated sand, sand the original requirements are: high refractoriness coated sand coated sand recycling machine manufacturers, less volatile matter, high-intensity particles themselves, usually made from natural silica sand, mainly because of its rich reserves, cheap, to meet the casting requirements. Only the special requirements of the casting was made of special sand (such as zircon sand, chromite, ceramic sand, magnetic iron ore, etc.) as the original sand coated sand: General requirements for silica sand is: A.SiO2: cast iron and non-ferrous casting require more than 90% sand, castings require more than 98%. B. acidic than alkaline sand sand. C. clay content <0.3%. D. Particle size distribution: 3 screen should adopt centralized, 5 sieve dispersion. E. grain shape: round good choice as silica sand, angular coefficient should generally be less than 1.3. Usually by two sand scrub to meet the requirements, but in order to improve the performance of coated sand, silica sand can be pickled or active treatment temperature (900-1200 ℃ roasting). Coated sand reclamation plant, coated sand regeneration, provided by Qingdao Heng 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!