Coated sand recycling has been a subject of concern is the majority of experts coated sand coated sand recycling equipment currently expensive and inefficient production of renewable coated sand, productivity 5 tons / hour of thermal regeneration equipment prices in 1200 -1600 million, regeneration coated sand cost 65-90 yuan / ton, so the high cost of domestic foundry enterprises can not generally accepted. Therefore, the development of economic and efficient recycling equipment coated sand has a broad market prospect coated sand other special requirements to meet the needs of different products, we developed a series of special coated sand as: centrifugal casting coated sand, chilling film sand, wet coated sand, sand sticking, anti-veining, anti-cellulite coated sand. While in 2004 the newly introduced fast-curing coated sand on the basis of having the performance of the curing rate can increase 30 to 70%, improve production efficiency and saving energy easy collapsibility coated sand class has good strength, while has excellent low temperature performance specialty coated sand collapsing, for the production of non-ferrous metal castings. Performance of the binder coated sand quality has a great influence casting coated sand, people have been working on how to improve the performance of phenolic resin, and to find alternatives to phenolic resin. Foreign countries have developed special resin different properties, such as high strength, low gas resin, the resin is easy to collapsing, there are reports of a modified polyester resin, but did not get round to promote, so far is still widely used modified phenolic resin. China in recent years in research and development Phenolic resin coated sand faster, has developed a different use for the production of modified phenolic resin-coated sand supply _ Qingdao Heng (certified) _ Qingdao Heng-coated sand Machinery Limited. 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.