 Heated @-@ manifold direct @-@ injection die casting , also known as direct @-@ injection die casting or <unk> die casting , is a zinc die casting process where molten zinc is forced through a heated manifold and then through heated mini @-@ nozzles , which lead into the molding cavity . This process has the advantages of lower cost per part , through the reduction of scrap ( by the elimination of sprues , gates and runners ) and energy conservation , and better surface quality through slower cooling cycles . 
