Coated sand process

Coated sand. The surface of the sand particles is covered with a layer of solid resin film molding sand or core sand before molding. There are two kinds of coating processes: cold method and hot method: the cold method uses ethanol to dissolve the resin, and add urotropine during the sand mixing process, so that the two are coated on the surface of the sand grains, and the ethanol volatilizes to obtain the coated sand; The method preheats the sand to a certain temperature, adds resin to melt, stirs to coat the surface of the sand particles, adds urotropine aqueous solution and lubricant, cools, breaks, and sieving to obtain coated sand. Used for steel castings and iron castings.