S. F. Engineering Works offers Two Roll Sand Mill. S. F. Engineering Works is the supplier of process plants and machinery required by the Chemical, Paint, Inks Pharmaceuticals, Minerals, Food and related Industries. The Two Roll Sand Mill is mainly used by the rubber & plastic industry for mixing and dispersing chemical additives into highly viscous materials. Two Roll Sand Mill consists of two parallel rolls mounted in a heavy frame with provision for accurately regulating the pressure and distance between the rolls.