China in the 1950s began to study the application of coated sand and shell (core) process 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 to market. With the continuous improvement of raw materials, manufacturing equipment and manufacturing processes, coated sand quality is improving, down production costs, since the 1990s, the application of coated sand has been more rapid development, increasing product range, and has formed series of. At present, China's annual production of coated sand casting has reached more than 500,000 tons of coated sand mold, there are hundreds of professional manufacturers. With the rapid development of China's automobile industry and mechanical products export needs, and the development of international markets casting, casting more and more high quality requirements, the application will be coated sand coated sand mixed rapid growth in the short term The method of manufacture of coated sand production anatomy experienced a dry blend method, cold coating method, temperature coating method, a thermal coating method four-stage resin coated sand coated sand production is currently almost all thermal coating method . Thermal coating process is the first raw sand heated to a certain temperature, then the resin respectively, Wuluo off product solution and calcium stearate are mixed and stirred, cooled from crushing and screening. Due to differences in formulation, mixing system technology is different. Currently kind of domestic production line of coated sand coated sand lot wholesale, hand feeding of semi-automatic production line is about 2000 to 2300, computer-controlled automated production line has nearly 50, to effectively improve production efficiency and product stability. Coated sand coated sand production method, mixed anatomy experienced a dry blend method, cold coating method, temperature coating method, a thermal coating method four stages, the current production of coated sand almost all thermal coating method. Thermal coating process is the first raw sand heated to a certain temperature, then the resin respectively, Wuluo off product solution and calcium stearate are mixed and stirred, cooled from crushing and screening. Due to differences in formulation, mixing system technology is different. Currently domestic species coated sand production line a lot, manual feeding of semi-automatic production line is about 2000 to 2300, computer-controlled automated production line has nearly 50, to effectively improve production efficiency and product stability. Oil-coated sand | Qingdao Heng (certified) | coated sand by Qingdao Heng Machinery Co. Qingdao Heng Machinery Co., Ltd. (www.thjidian.com) is in Qingdao, Shandong 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 leadership with the staff warmly welcome all inquiries negotiations to create a better future Qingdao Heng.