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Induction sealing device and method which may be used for producing packages of pourable food products

  • US 7,538,302 B2
  • Filed: 03/26/2004
  • Issued: 05/26/2009
  • Est. Priority Date: 03/28/2003
  • Status: Active Grant
First Claim
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1. An induction sealing device for producing packages of pourable food products by transversely sealing a tube of sheet packaging material comprising at least one layer of induction heatable material covered with plastic material, said sealing device comprising:

  • generating means for generating an alternating power signal, said alternating power signal having a current-voltage phase angle;

    at least one inductor receiving the alternating power signal to induce a parasitic electric current in said layer and locally melt said plastic material to form a transverse seal; and

    a matching circuit for achieving optimum power transfer between said generating means and said inductor;

    wherein said matching circuit comprises an inductive-capacitive circuit, in which at least one inductive element is connected to at least one variable-capacitance capacitive element;

    the capacitance of the capacitive element being adjustable so that the current-voltage phase angle is close to zero.

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