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 ethanol dissolving the resin-coated sand regeneration, and join in the sand methenamine process, so that the two surfaces coated sand, volatile ethanol, was covered membrane sand; calorimetry preheating the sand to a certain temperature, and melted resin to be added, stirring the surface of the resin coated sand, and adding an aqueous solution of hexamine Shandong lubricant coated sand regeneration, cooling, crushing, and screening to give coated sand. For steel, cast iron coated sand iron type process The process is in rough shape of the metal type (iron type) cavity covered with a thin layer of coated sand (3-8mm) and the formation of mold, shown in Figure 1. It does this by various means, such as technology test, computer simulation, experience charts, reasonable set of iron-type wall thickness and the thickness of coated sand, sand casting system and coating materials to achieve so cast in a more favorable conditions Under the complete filling and solidification cooling, improve its internal quality and surface quality of the purpose of the first iron-type cladding sand technology was developed in the small foundry business and successful application. The late 1970s, China's first iron built with Sand casting production lines. 80 years after the coated sand equipment, type of iron coated sand casting process and application of basic research enterprises have formed teams and get faster development. At present, Qingdao coated sand regeneration manufacturers, China has hundreds of companies with Sand cast iron used in production, with an annual output of iron with Sand casting about 100,000 tons (mainly crankshafts, camshafts, gears and export castings, etc.) annual consumption of approximately 20,000 tons of coated sand. Shandong coated sand regeneration factory, 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.