Patent ID: 9596720
Date: 2017-03-14
CPC Classifications: B29C,B29K,B33Y,H05B

Claim:
1. A device for heating a feedstock of meltable or flowable material, comprising: a) a heating body of electrically conductive material, with one or more inlet orifices where said feedstock is introduced, and one or more outlet orifices for said feedstock to exit after being heated, with one or more passages or mixing chambers connecting said inlet orifices and outlet orifices, comprising a nozzle, and b) said nozzle sandwiched between the two ends of, or inserted through a hole or gap in, a continuous or segmented core of material having high magnetic permeability but low electrical conductivity, forming a complete magnetic loop, said nozzle fit in a gap in the magnetic loop, wherein the magnetic loop is oriented in a plane not substantially parallel with said nozzle, said core configured to support a loop or loops of magnetic flux lines of temporal alternating amplitude such that at least a portion of said temporal alternating magnetic flux lines interact with said nozzle resulting in heating of said nozzle due to eddy current effects, said core having at least some thermal conduction from said nozzle to said core, said eddy current heating limited by the Curie temperature property of material of said core, and c) one or more coils of electrically conductive wire passing through the center of said loop and around the outside of said loop, and d) one or more sources of high frequency alternating current connected to said coil or coils, inducing said magnetic flux lines and said eddy currents.