Coated sand mainly uses high-quality selection of natural quartz sand as raw sand, thermoplastic phenolic resin coated sand casting plant, methenamine and enhancers as raw materials. According to user needs different techniques, coated sand, curing speed, stripping, mobility, collapsibility, the casting surface finish, storage and other aspects of the appropriate adjustments to match. It is one of the cars, tractors, hydraulic parts and other materials the best shape. China's coated sand technology began in the mid-1950s, the 1960s was once disabled. In the 1980s, due to the rapid development of automobile industry and the need for mechanical product exports, the quality of the casting of a higher requirement, coated sand supply, so as to promote the rapid development of coated sand production and application technology [1]. 1986 Jinan Foundry and Forging Institute of Technology first developed a new production technology coated sand coated sand price, the amount of resin fell from 6 to 10 percent in the early 1980s to 3-4%, close to the international advanced level in the same period. The rapid development of the early 1990s coated sand plant up across the country, new products, new technologies continue to emerge, to the 21st century, annual sales of coated sand industry has reached more than 900,000 tons, widely used in automotive cylinder block, cylinder cover, intake manifold, various types of pipe fittings, pump and other complex castings. Handmade wet coated sand: the coated sand wet compressive strength can be adjusted within 0.1-0.3MPa. Stored for more than three months for hand molding or core system (similar to tung oil sand Hop fat sand), in a release room temperature, the type of (core) placed in a heating oven or oven, heating temperature 250-350 ℃, heating time 3-10min, type (core) after curing has high strength, low gas evolution, creep deformation amount, does not absorb moisture and so on. The coated sand suitable for single piece, small batch and high precision castings, is particularly suitable for township enterprises to adopt. It is worth noting that, in the type (core) heat curing, must wait to put the time to achieve the required temperature of the heating furnace, avoid heating the furnace temperature coated sand process, coated sand, Qingdao Heng, coated sand Regeneration manufacturers by Qingdao Heng Machinery Co. Qingdao Heng Machinery Co., Ltd. (www.thjidian.com) strong, credible, in Qingdao, Shandong 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!