... extruding Triangle rubber strip.(3)Calendering------Use friction calenderCord thread get through the calender,and sizing material rub off ... on cord thread.(4)Bead mouldingBead is wrapped by many steel ... ,275-17,275-18275-21,300-17,300-18,300-16,325-16,325-18,300-19,375-19,410-18 ... 275-17,275-18275-21,300-14,300-17,300-18,300-16,325-16,325-18,300-19,375-19,410-18 ...