Other special requirements for coated sand to meet the needs of different products, developed a series of special coated sand as: centrifugal casting coated sand, chilling coated 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 collapsing has excellent low temperature performance, for the production of non-ferrous metal castings. Adhesive properties have a great impact on the quality of 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 receive the comprehensive promotion of special coated sand, so far it 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 by Dr. Ke Luoning Germany during World War II invention, the process Process is powdered thermosetting phenolic resin sand mechanically mixed with the original production of coated sand, when heat cured. Later developed into a thermoplastic phenolic resin plus latent curing agent (methenamine) and lubricants through a certain coating process formulated as coated sand, resin coated sand surface melted when heated coated sand in Ukraine By Lotto coated sand product decomposition of methylene role molten resin rapidly changed from a linear structure into the body structure is not melted, so that coated sand curing. Coated sand plant, coated sand, provided by Qingdao Qingdao Heng 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!