a shear ring screw adopted for use with polymer extrusion or injection molding machinery including a first stage feeding portion , a second stage ring section and a third stage tip section . it would be generally aimed at improving the melting , dispersing and spatial distributive mixing action of such machinery . this would be generally achieved through the use of shear rings with a series of angled ports or holes . the ring section disperses fillers or additives by powerful shearing and stretching force created by relative ring to ring and ring to screw movements . the molten mixture could be further mixed and homogenized by the tube tip section which have plural of port members on radial directions and a conical shaped flow channel in axial direction .