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Two-wire hot runner nozzle heater system

  • US 7,601,935 B2
  • Filed: 09/07/2006
  • Issued: 10/13/2009
  • Est. Priority Date: 11/21/2003
  • Status: Active Grant
First Claim
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1. A hot runner nozzle heater system comprising:

  • at least one hot runner nozzle;

    at least one resistive layer disposed proximate the runner nozzle, the resistive layer having sufficient temperature coefficient of resistance characteristics such that the resistive layer is a heater element and a temperature sensor;

    two electrical lead wires connected to the resistive layer; and

    a two-wire controller connected to the resistive layer through the two electrical lead wires, wherein the two-wire controller determines temperature of the heater system using the resistance of the resistive layer and controls heater system temperature accordingly through the two electrical lead wires, wherein the heater system provides heat to the at least one hot runner nozzle.

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