Hot runner nozzle heater and methods of manufacture thereof

US7280750B2 · kind B2 · utility

Assignee

• WATLOW ELECTRIC MANUFACTURING COMPANY · US

Inventors

• Elias Russegger · Bischofshofen, AT
• Gerhard Schefbanker · Bischofshofen, AT
• Gernot Antosch · Altstadt, AT
• Wolfgang Pöschl · Abtenau, AT
• Christopher C. Lanham · O'Fallon, US
• James McMillin · Algonquin, US
• William A. McDowell, III · Aurora, US
• Kenneth F. Fennewald · Maryland Heights, US
• Allen Boldt · Kirkwood, US
• Frederic Zimmermann · Frankenberg, Hesse, DE
• Reinhardt Lehnert · Ubstadt-Weiher, DE
• Kevin Ptasienski · O'Fallon, US

Key dates

• Filing date: Oct 17, 2005
• Grant date: Oct 9, 2007
• Expiry date: Nov 17, 2025

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/6416
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A hot runner nozzle heater is provided that includes a sleeve defining a slot extending along a length of the sleeve. A first dielectric layer is disposed over an outer surface of the sleeve, and a resistive element layer is disposed over the first dielectric layer, wherein the resistive element layer defines a resistive circuit pattern that is preferably formed by a laser trimming process. A pair of terminal leads are secured to a portion of the resistive element layer thus defining a termination area, and the termination area is positioned proximate the slot and away from the proximal end and the distal end of the sleeve. A second dielectric layer is disposed over the resistive element layer but not over the termination area, a third dielectric layer is disposed over the termination area, and a protective layer disposed over the second dielectric layer and the third dielectric layer.