US Patent:
20080136066, Jun 12, 2008
Inventors:
Bruce F. Taylor - Worthington OH, US
Robert Kadykowski - New Richmond OH, US
Rene Larive - Grand Mere, CA
Elisabeth Leclerc - Grand-Mere, CA
Dany Larive - Grand-Mere, CA
Timothy W. Womer - Edinburg PA, US
International Classification:
B29C 47/80
H05B 6/14
US Classification:
264486, 4253781, 264454, 264457
Abstract:
Disclosed herein is an apparatus and method with inductive heating of an electrically conductive workpiece such as a barrel used in molding or extrusion, having a layer of thermal insulation interposed between the induction windings and the workpiece, and using alternating current (AC) at an elevated frequency. Further, variable pitch induction windings may be used to generate a non-uniform and calculated heat input profile, such as to compliment the configuration of a screw for transporting material through the barrel.