Abstract: A seal for a check valve for a metal molding machine. The seal is provided by the combination of a peripheral groove in an outer surface of the check valve and a helically wound core in the groove. The helically wound coil is expandable into sealing engagement with a cylindrical wall of the molding machine. The helically wound coil may be movable laterally in the groove between a melt channel open position and a melt channel closed position to open or seal the melt channel.

Abstract: The present invention provides an improved extruder assembly, that includes a wiper for wiping a screw portion in a low pressure extruder stage, whereby the wiping of the screw portion improves melt conveyance through the low pressure extruder stage. The present invention has particular utility when used in a low pressure venting and entrainment extruder stage of a single screw compounding extruder. The present invention also provides an extrusion/injection unit for use in-line compounding molding system that incorporates the improved extruder assembly.

Abstract: A seal for a check valve for a metal molding machine. The seal is provided by the combination of a peripheral groove in an outer surface of the check valve and a helically wound core in the groove. The helically wound coil is expandable into sealing engagement with a cylindrical wall of the molding machine. The helically wound coil may be movable laterally in the groove between a melt channel open position and a melt channel closed position to open or seal the melt channel.

Abstract: A check valve for a molding machine. The check valve has a stem portion and a ring portion movable along said stem portion between a melt channel open position and a melt channel closed position. A groove is formed in a forward face of the ring portion. The groove, in operation, receives melt to force an outer circumferential portion of the ring in a radial direction to provide a seal between the ring portion and a wall in the machine.

Abstract: A screw tip for use in a molding system apparatus is disclosed. The screw tip includes a connection section and screw tip head section. The screw tip head houses an entry port, or entry ports, an accumulation chamber, and a check valve chamber. A check valve is provided when assembled with the screw tip. The check valve may be a cylindrical plate or a spherical member or a conical member.

Abstract: A check valve for a molding machine. The check valve has a stem portion and a ring portion movable along said stem portion between a melt channel open position and a melt channel closed position. A groove is formed in a forward face of the ring portion. The groove, in operation, receives melt to force an outer circumferential portion of the ring in a radial direction to provide a seal between the ring portion and a wall in the machine.

Abstract: A screw tip for use in a molding system apparatus is disclosed. The screw tip includes a connection section and screw tip head section. The screw tip head houses an entry port, or entry ports, an accumulation chamber, and a check valve chamber. A check valve is provided when assembled with the screw tip. The check valve may be a cylindrical plate or a spherical member or a conical member.

Abstract: The present invention provides an improved extruder assembly, that includes a wiper for wiping a screw portion in a low pressure extruder stage, whereby the wiping of the screw portion improves melt conveyance through the low pressure extruder stage. The present invention has particular utility when used in a low pressure venting and entrainment extruder stage of a single screw compounding extruder. The present invention also provides an extrusion/injection unit for use in-line compounding molding system that incorporates the improved extruder assembly.

Abstract: A seal for a check valve for a metal molding machine. The seal is provided by the combination of a peripheral groove in an outer surface of the check valve and a helically wound core in the groove. The helically wound coil is expandable into sealing engagement with a cylindrical wall of the molding machine. The helically wound coil may be movable laterally in the groove between a melt channel open position and a melt channel closed position to open or seal the melt channel.

Abstract: A check valve for a molding machine. The check valve has a stem portion and a ring portion movable along said stem portion between a melt channel open position and a melt channel closed position. A groove is formed in a forward face of the ring portion. The groove, in operation, receives melt to force an outer circumferential portion of the ring in a radial direction to provide a seal between the ring portion and a wall in the machine.

Abstract: A screw tip for use in a molding system apparatus is disclosed. The screw tip includes a connection section and screw tip head section. The screw tip head houses an entry port, or entry ports, an accumulation chamber, and a check valve chamber. A check valve is provided when assembled with the screw tip. The check valve may be a cylindrical plate or a spherical member or a conical member.

Abstract: The present invention relates to a cooling device to be used with an index molding machine having a rotary turret block with at least two movable mold halves thereon. The cooling device includes a frame attached to a support for the rotary turret block, cooling tubes for receiving and cooling at least one molded part, which cooling tubes are mounted to a surface of a carrier plate connected to the frame, and an actuation device for moving the carrier plate between a first orientation where the cooling tubes are aligned with the at least one molded part and a second orientation where the at least one molded part cooled within the cooling tubes. In a preferred embodiment of the present invention, the cooling device also includes at least one blowing tube for blowing cool air onto the at least one molded part.