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Fine Film Multi-Layer Printed Induction Heating Element

IP.com Disclosure Number: IPCOM000008044D
Publication Date: 2002-May-14
Document File: 4 page(s) / 60K

Publishing Venue

The IP.com Prior Art Database

Abstract

This invention broadly relates to the construction and use of a cylindrical heating element. In particular, this invention relates to the construction and use of a fine film multi-layer printed induction heating element in a cylindrical configuration to heat a nozzle of an injection molding system. The proposed heater is to be made by printing circular conductive patterns of the current carrying elements to produce inductive effect on the nozzle body. Eddy currents induced in the nozzle body will produce a heating effect as commonly known by Ohmic losses.

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Page 1 of 4

Field of the Invention

       This invention broadly relates to the construction and
use of a cylindrical heating element. In particular, this
invention relates to the construction and use of a fine film
multi-layer printed induction heating element in a cylindrical
configuration to heat a nozzle of an injection molding system.

Summary of the Prior Art

       Currently bi-metal type heaters are used quite
extensively to heat nozzles, wherein two materials are used to
sandwich the cable heater between the inner and outer cylinder.
The inner sleeve is heated, and caused to expand. The outer
sleeve is made of titanium and is used to restrict expansion,
forcing the inner sleeve to fold around the nozzle body. This is
a complex, complicated, and very expensive assembly that
involves precision machined parts. Tolerances are critical for
proper functioning of this heater. An out of tolerance assembly
does not perform the gripping function, but rather opens the
inner sleeve and therefore reduces heat sinking ability of the
heater; this in turn overheats the heating elements.

Summary of the Invention

       The primary objective of the invention is to provide a
fine film multi-layer printed induction heating element in a
cylindrical configuration for use with a nozzle of an injection
mold system.

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Page 2 of 4

Advantages of this invention over prior art include:

1. Low profile tubular heating means
2. Easy to install
3. Flexibility in manufacturing-printing machinery
available.
4. No machining involved - fully automated process
5. Reliability ensured by design - no electrical...