Country in the 1950s began to study the application of coated sand and shell (core) processes, until the mid-1980s, only a few plants using homemade shell core for the production of coated sand. Since then, the coated sand began as a commodity on the market. With the continuous improvement of raw materials, manufacturing equipment and manufacturing processes, coated sand quality is improving, declining production costs, since the 1990s, the application of coated sand has been more rapid development, increasing product variety, and has formed a series technology. Currently coated sand regeneration of coated sand casting production reached 500,000 tons, a total of hundreds of professional manufacturers. With the rapid development of China's automobile industry and mechanical products export needs regeneration coated sand suppliers, as well as international market development castings, castings increasingly demanding high-quality, coated sand will be applied rapidly in the short term Growth century has come, this 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, protecting the natural environment for human survival. (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, 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 coated sand production line regeneration, researchers coated sand sand reclamation and reuse old already has great practical significance, not only can improve the coating Sand's performance, but also cost-coated sand regeneration, reduce waste pollution on the environment (1) the general category of quartz sand coated sand, thermoplastic phenolic resin, methenamine and calcium stearate, without concerning additives. Generally applicable to the production of cast iron. (2) high-strength low gas class ordinary coated sand coated sand replacement products, by adding additives and use of new technology related to the preparation, its strength is higher than 30% more than ordinary coated sand, gas evolution was also significantly reduced, for the production of complex precision iron castings. Coated sand regeneration factory, Qingdao Heng (certified), sunshine 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.