process in which the mixing proportion of various molding materials is determined according to the requirement of molding sand properties in molding sand preparation (see: molding material, molding sand, molding sand preparation), erinevate vormimaterjalide koguse määramine vormisegu soovitud omaduste saamiseks vormisegu ettevalmistamisel (vt vormimaterjal, vormisegu, vormisegu ettevalmistus)