Patent · US Expired

Electric heating element for hot runner systems and a method for producing a heating element of this type

US6797925B1 · kind B1 · utility

14Cited by

15References

40Claims

0Family size

Assignee

Gunther Heisskanaltechnik GmbH · DE

Inventors

Herbert Gunther · Allendorf (Eder), DE
Christel Kretschmab · Borken, DE
Peter Otschik · Rabenau, DE

Key dates

Filing date	Feb 27, 2002
Grant date	Sep 28, 2004
Priority date	—
Expiry date	Mar 24, 2022

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29C2045/2748
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

An electric surface heating element is installed by direct application to the periphery of a cylindrical material pipe (13) of a hot runner nozzle (12). Said surface heating element consists of a ceramic dielectric layer (20) which is directly applied to the metal pipe (13) or to the wall (16) thereof, at least one layer (22) consisting of heating conductor strips (23) and an electrically insulating ceramic covering layer (24) which is applied on top of the latter. Film, or thick-coat screen printing technology are suitable as coating processes. However, thick-coat technology using round printing is preferably used for the layer construction as a whole. Alternatively, the ceramic dielectric layer (20) can be fixed to the periphery of the hot runner pipe (13) in the form of a prefabricated green film and subsequently baked.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.