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  • Injection molding nozzle with separable core and one-piece collar
    Patent number: 5507635
    Abstract: An injection molding nozzle with an elongated body removably seated in a one-piece outer collar. The outer collar has a circular insulation flange which seats in the mold to locate the nozzle. The elongated body has an electrical heating element coiled around a central melt channel. Terminal portions of the heating element extend outwardly through a U-shaped opening in the outer collar into a ceramic connector. The connector is secured in place by an inner lip which slides into a groove around the U-shaped opening.
    Type: Grant
    Filed: December 28, 1994
    Date of Patent: April 16, 1996
    Inventor: Jobst U. Gellert
  • Injection molding nozzle with partially unheated heating element
    Patent number: 5282735
    Abstract: An injection molding nozzle and method of making it having an electrical heating element extending in a pair of alternating coils in a spiral channel around a central melt passage. The heating element has a U-shaped bend near the forward end of the nozzle and two ends at an external terminal near the rear end. A central wire in the heating element has a fine coiled heating portion extending between two larger diameter conductive portions which extend to the terminal. One of the conductive portions of the central wire is a predetermined length longer than the other and extends in one of the alternating coils of the heating element along a rear portion of the nozzle adjacent the terminal. The heating portion of the wire extends in both of the alternating coils of the heating element along a forward portion of the nozzle so the heating element provides substantially less heat along the rear portion than along the forward portion of the nozzle.
    Type: Grant
    Filed: December 7, 1992
    Date of Patent: February 1, 1994
    Inventor: Jobst U. Gellert
  • Compact cartridge hot runner nozzle and method of making
    Publication number: 20020054933
    Abstract: The present invention provides an electrically heated nozzle for injection molding which is insulated to prevent conduction of electricity and loss of thermal transmission to the casing, with first and second electric heaters which can operate independently or simultaneously to heat the melt channel of the nozzle.
    Type: Application
    Filed: December 26, 2001
    Publication date: May 9, 2002
    Inventors: Jobst U. Gellert, Denis Babin, Jonathon Fischer
  • Hot runner nozzle with interlaced heater and sensor
    Publication number: 20040037913
    Abstract: The present invention provides an electrically heated nozzle for injection molding which is insulated to prevent conduction of electricity and loss of thermal transmission to the casing, with an electric heater and sensor that are wrapped around substantially the same portion of a melt channel of the nozzle.
    Type: Application
    Filed: June 23, 2003
    Publication date: February 26, 2004
    Applicant: Mold-Masters Limited
    Inventors: Jobst U. Gellert, Denis Babin, Jonathon Fischer
  • Compact cartridge hot runner nozzle and method of making
    Publication number: 20030228390
    Abstract: The present invention provides an electrically heated nozzle for injection molding which is insulated to prevent conduction of electricity and loss of thermal transmission to the casing, with first and second electric heaters which can operate independently or simultaneously to heat the melt channel of the nozzle.
    Type: Application
    Filed: June 20, 2003
    Publication date: December 11, 2003
    Applicant: Mold-Masters Limited
    Inventors: Jobst U. Gellert, Denis Babin, Jonathon Fischer
  • Multi-cavity injection moulding system
    Patent number: 5223275
    Abstract: The present invention refers to a hot runner manifold composed of two parallel hot runner plates disposed in parallel, one behind the other, to feed at least two different plastic materials along horizontal hot runners to injection nozzles bolted to the front hot runner manifolds.
    Type: Grant
    Filed: October 2, 1991
    Date of Patent: June 29, 1993
    Inventor: Jobst U. Gellert
  • Compact cartridge hot runner nozzle
    Patent number: 6561789
    Abstract: The present invention provides an electrically heated nozzle for injection molding which is insulated to prevent conduction of electricity and loss of thermal transmission to the casing, with first and second electric heaters which can operate independently or simultaneously to heat the melt channel of the nozzle.
    Type: Grant
    Filed: December 26, 2001
    Date of Patent: May 13, 2003
    Assignee: Mold-Masters Limited
    Inventors: Jobst U. Gellert, Denis Babin, Jonathon Fischer
  • Hot runner nozzle with interlaced heater and sensor
    Patent number: 7108502
    Abstract: The present invention provides an electrically heated nozzle for injection molding which is insulated to prevent conduction of electricity and loss of thermal transmission to the casing, with an electric heater and sensor that are wrapped around substantially the same portion of a melt channel of the nozzle.
    Type: Grant
    Filed: June 23, 2003
    Date of Patent: September 19, 2006
    Assignee: Mold-Masters Limited
    Inventors: Jobst U. Gellert, Denis Babin, Jonathon Fischer
  • Compact cartridge hot runner nozzle and method of making
    Publication number: 20020054932
    Abstract: The present invention provides an electrically heated nozzle for injection molding which is insulated to prevent conduction of electricity and loss of thermal transmission to the casing, with first and second thermocouples for sensing temperature of the nozzle, the two thermocouples are independent so they can act either independently or simultaneously to sense temperature conditions in the melt channel of the nozzle.
    Type: Application
    Filed: December 26, 2001
    Publication date: May 9, 2002
    Inventors: Jobst U. Gellert, Denis Babin, Jonathon Fischer
  • Compact cartridge hot runner nozzle
    Patent number: 6761557
    Abstract: The present invention provides an electrically heated nozzle for injection molding which is insulated to prevent conduction of electricity and loss of thermal transmission to the casing, with first and second electric heaters which can operate independently or simultaneously to heat the melt channel of the nozzle.
    Type: Grant
    Filed: June 20, 2003
    Date of Patent: July 13, 2004
    Assignee: Mold-Masters Limited
    Inventors: Jobst U. Gellert, Denis Babin, Jonathon Fischer
  • Injection molding nozzle having nose portion with heating element encircling the bore
    Patent number: 4911636
    Abstract: An integral sprue gated injection molding nozzle having a melt bore extending centrally therethrough wherein a circular forward end portion of the electrical heating element encircles the melt bore in the nose portion to provide additional heat adjacent the gate.
    Type: Grant
    Filed: October 21, 1988
    Date of Patent: March 27, 1990
    Inventor: Jobst U. Gellert
  • Mold gate insert with a thermal barrier
    Publication number: 20030235638
    Abstract: A mold gate insert includes a mold gate insert body, which is comprised of a material having a high thermal conductivity, and a thermal insulation element, which is nested in the mold gate insert body. The thermal insulation element is provided to abut a nozzle seal and align the nozzle with a mold gate. The amount of heat transferred from the nozzle to the mold gate insert is reduced by the thermal insulation element.
    Type: Application
    Filed: April 11, 2003
    Publication date: December 25, 2003
    Applicant: Mold-Masters Limited
    Inventor: Jobst U. Gellert
  • Manifold with film heater
    Publication number: 20040079511
    Abstract: The present invention provides improved heated manifolds, heaters and nozzles for injection molding, having a high strength metal skeleton infiltrated with a second phase metal having higher thermal conductivity. Also disclosed is method of forming a manifold, heater or nozzle preform and infiltrating the preform with a highly thermally conductive material. The invention also provides a method of simultaneously infiltrating and brazing injection molding components of similar or dissimilar materials together.
    Type: Application
    Filed: December 8, 2003
    Publication date: April 29, 2004
    Inventors: Jobst U. Gellert, George Olaru
  • Mold gate insert with a thermal barrier
    Patent number: 7025585
    Abstract: A mold gate insert includes a mold gate insert body, which is comprised of a material having a high thermal conductivity, and a thermal insulation element, which is nested in the mold gate insert body. The thermal insulation element is provided to abut a nozzle seal and align the nozzle with a mold gate. The amount of heat transferred from the nozzle to the mold gate insert is reduced by the thermal insulation element.
    Type: Grant
    Filed: April 11, 2003
    Date of Patent: April 11, 2006
    Inventor: Jobst U. Gellert
  • Manifold with film heater
    Publication number: 20030145973
    Abstract: The present invention provides improved heated manifolds, heaters and nozzles for injection molding, having a high strength metal skeleton infiltrated with a second phase metal having higher thermal conductivity. Also disclosed is method of forming a manifold, heater or nozzle preform and infiltrating the preform with a highly thermally conductive material. The invention also provides a method of simultaneously infiltrating and brazing injection molding components of similar or dissimilar materials together.
    Type: Application
    Filed: March 3, 2003
    Publication date: August 7, 2003
    Inventors: Jobst U. Gellert, Hakim Belhadjamida
  • Compact cartridge hot runner nozzle
    Patent number: 6638053
    Abstract: The present invention provides an electrically heated nozzle for injection molding which is insulated to prevent conduction of electricity and loss of thermal transmission to the casing, with first and second thermocouples for sensing temperature of the nozzle, the two thermocouples are independent so they can act either independently or simultaneously to sense temperature conditions in the melt channel of the nozzle.
    Type: Grant
    Filed: December 26, 2001
    Date of Patent: October 28, 2003
    Assignee: Mold-Masters Limited
    Inventors: Jobst U. Gellert, Denis Babin, Jonathon Fischer
  • Two-piece injection molding nozzle seal
    Patent number: 5299928
    Abstract: A two-piece injection molding nozzle seal. The inner piece through which the melt duct extends is formed of a highly thermally conductive material to enhance heat transfer during the thermodynamic cycle. The surrounding outer retaining piece which extends from the heated nozzle into contact with the cooled mold to provide the necessary seal is formed of a substantially less conductive material to avoid undue heat loss.
    Type: Grant
    Filed: July 26, 1993
    Date of Patent: April 5, 1994
    Inventor: Jobst U. Gellert
  • Injection molding nozzle insert with valve member locating blades
    Patent number: 5334008
    Abstract: Injection molding apparatus for valve gating in which the valve member extends through a locating insert mounted at the front end of the nozzle. The locating insert has a pair of spiral blades extending inwardly from an outer collar. The spiral blades have curved inner edges which encircle the valve member sufficiently to maintain the valve member in accurate alignment with the gate as it reciprocates between the open and closed positions.
    Type: Grant
    Filed: April 26, 1993
    Date of Patent: August 2, 1994
    Inventor: Jobst U. Gellert
  • Profiled plate heaters for injection molding nozzles
    Patent number: 4892474
    Abstract: Injection molding nozzle having electric plate heaters mounted thereon. Insulative air spaces are provided according to a predetermined size, shape and pattern between the outer surfaces of the nozzle and the abutting inner surface of each heater. This provides heat transfer from the heaters to the nozzle according to a desired profile along the melt flow passage through the nozzle, depending upon the system configuration and the application.
    Type: Grant
    Filed: February 21, 1989
    Date of Patent: January 9, 1990
    Inventor: Jobst U. Gellert
  • Injection molding component with heating element and method of making
    Publication number: 20020148590
    Abstract: The present invention provides improved heated manifolds, heaters and nozzles for injection molding, having a high strength metal skeleton infiltrated with a second phase metal having higher thermal conductivity. Also disclosed is method of forming a manifold, heater or nozzle preform and infiltrating the preform with a highly thermally conductive material The invention also provides a method of simultaneously infiltrating and brazing injection molding components of similar or dissimilar materials together.
    Type: Application
    Filed: June 17, 2002
    Publication date: October 17, 2002
    Inventors: Jobst U. Gellert, Hakim Belhadjamida
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