Abstract: An integral heated molding device for maintaining at a controlled elevated temperature material passing through an orifice in the device, which has a heat transfer central core secured to an overlying cover and having an annular space between the central core and cover containing a resistance wire wound ceramic core embedded and compacted in heat transfer electrical insulation material, with leads connecting the wire wound core to a source of power exiting from the device remote from the orifice. The invention also includes steps for making such a heated molding nozzle or bushing device.

Abstract: A unitary integral electrically heated nozzle device for plastic molding or die casting equipment which has a novel casing integral with a heater core, which is insulated to prevent conduction of electricity and loss of thermal transmission to the casing, the electrical insulation being compacted within the casing and around the heater core and the assembly being sealed and swaged into a unitary form, said device being structured to heat the area of a gate or passage for delivery of molten material into a forming cavity. The nozzle device may be shaped, and the nozzle systems include such nozzle devices in the gate channels for delivering molten material to the forming cavity.

Abstract: A unitary integral electrically heated nozzle device for plastic molding or die casting equipment which has a novel casing integral with a heater core, which is insulated to prevent conduction of electricity and loss of thermal transmission to the casing, the electrical insulation being compacted within the casing and around the heater core and the assembly being sealed and swaged into a unitary form, the device being structured to heat the area of a gate or passage for delivery of molten material into a forming cavity. The nozzle device may be shaped, and the nozzle systems include such nozzle devices in the gate channels for delivering molten material to the forming cavity.

Abstract: A unitary integral electrically heated nozzle device for plastic molding or die casting equipment which has a novel casing integral with a heater core, which is insulated to prevent conduction of electricity and loss of thermal transmission to the casing, the electrical insulation being compacted within the casing and around the heater core and the assembly being sealed and swaged into a unitary form, said device being structured to heat the area of a gate or passage for delivery of molten material into a forming cavity. The nozzle device may be shaped, and the nozzle systems include such nozzle devices in the gate channels for delivering molten material to the forming cavity.

Abstract: A unitary integral electrically heated nozzle device for plastic molding or die casting equipment which has a novel casing integral with a heater core, which is insulated to prevent conduction of electricity and loss of thermal transmission to the casing, the electrical insulation being compacted within the casing and around the heater core and the assembly being sealed and swaged into a unitary form, said device being structured to heat the area of a gate or passage for delivery of molten material into a forming cavity. The nozzle device may be shaped, and the nozzle systems include such nozzle devices in the gate channels for delivering molten material to the forming cavity.

Abstract: An electric band heater of low expansion characteristics having an integral ceramic core with resistance wire sandwiched therein and encased within a metal housing, the core being formed from a wire wound ceramic sheet sandwiched between ceramic sheets; and a method for making such a heater which includes the steps of arranging an assembly of a wire wound organic-ceramic core strip between organic-ceramic insulator strips and placing the same within a metal housing, compressing and forming the assembly and then heating the assembly to bake out organic binder materials and sinter ceramic materials into a ceramic mass.

Abstract: An electrically heated nozzle device for plastic molding or die casting equipment having a novel casing with an integral heater core, and means to seal the casing for retaining the heater core in place and to electrically insulate the electrical heating element from the casing and prevent loss of thermal transmitting packing contained in the casing, which is structured to receive the heater core in the area close to its passage for carrying molten material to be molded or cast in a forming cavity, and which may be shaped. The casing may also include a probe for a thermocouple or a thermocouple well for sensing temperature; and the method includes the steps of arranging an unsheathed electric heating element in a bore formed in the nozzle casing in proximity to its molding material orifice, filling the bore with heat transmitting electrical insulation embedding an electric heating element, compacting the insulation about the heating element and in the bore to eliminate air voids, and sealing the bore.

Abstract: A torpedo heater device for plastic molding or diecasting equipment comprised of a novel casing having an integral heater core and means to seal the casing for retaining the heater core in place and preventing loss of thermal transmitting packing contained in the casing, and which is structured to receive the heater core in the area close to its tip, which is tapered. The casing may also include a probe for a thermocouple or a thermocouple well.