Sand sand adhered to the surface of the adhesive film

Old sand sand the surface condition of foundry sand for molding or core system, you need to use a certain amount of grit adhesively bonded together, so the adhesive will adhere to the sand surface to form an adhesive film, attached to sand surface force,  cubic boron nitride . The binder itself between molecules, there are links between power, a cohesive adhesive. Sand sand sand sand the surface condition of the adhesive film  Abrasive grinding to the surface, changing the surface abrasive grinding  of the sand. According to the solid surface energy theory, this would allow the sand surface energy decreases, when once again adding new adhesive, the two-phase interface activity is reduced.