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 coated sand regeneration process manufacturers in the sand, so that the two coated sand surface, ethanol volatilize, too coated sand; calorimetry preheating the sand to a certain temperature, adding the resin to melt, stirring the resin coated sand surface, adding an aqueous solution of hexamine and lubricants, cooling, crushing, screening was coated sand. For steel castings, centrifugal cast iron heat method is the process of casting metal type (iron type) in rough shape of a traditional centrifugal casting process, mainly for the production of Tube rotator casting, first in the iron mold cavity surface coating modulo a layer of paint in order to facilitate hanging. In recent years, has developed a suitable alternative coating production centrifugal casting coated sand. Because of its poor exhaust effect, it requires thin wall (about 3mm), and often using double sand, and casting the contact surface with sand (70/140 mesh) coated sand regeneration, the outer layer of coarse sand (50 / 100 mesh) century has arrived, it is a modern high-tech rapid development and product quality, environmental protection era of fierce competition. People for the requirements of their own living environment increasingly high, companies should follow the requirements of environmental laws to organize production. Foundry industry is the machinery industry pollution, energy consumption, and poor working conditions in the industry. 21st century styling, core technical progress key issues should be the development of non-polluting, less pollution, low production cost, energy-saving materials and labor conditions are good modeling, core processes. Therefore, coated sand technology in the future direction of development should be: (1) reduction of environmental pollution coated sand, the development of low free phenol, low gas, less pollution phenolic resin coated sand regeneration, protection of mankind's natural survival environment. (2) study of phenolic resin substitutes. Because phenolic resins are expensive to develop a new type of cheap binder is a priority. (3) further research and improvement of rheological phenolic resin coated sand recycling machinery, and constantly improve the reaction resin coating and curing properties. (4) study the performance of resin synthesis process control, resin macromolecules and small molecules suitable grading also need further research to improve the strength and toughness and resistance to shelling resin. (5) further study the reuse of the old sand. With the increasing amount of coated sand, many manufacturers have reached several thousand tons more than the amount of research coated sand sand reclamation and reuse old already has great practical significance, which can not only improve the performance of coated sand, and but also to save costs, reduce waste materials coated sand environmental pollution recycling machinery, Qingdao Heng (certified), coated sand regeneration provided by Heng Machinery Co., Ltd. Qingdao. Qingdao Heng Machinery Co., Ltd. (www.thjidian.com) is Qingdao, cleaning, cleaning equipment leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Qingdao Heng led the staff warmly welcome all inquiries negotiations to create a better future Qingdao Heng.