Title:
HEAT-SEALING DEVICE FOR PACKAGING MATERIAL
Document Type and Number:
WIPO Patent Application WO2003053626
Kind Code:
A3
Abstract:
The invention concerns a heat-seal device for heat-sealing a moving packaging material (1) comprising a layer which can be heated by electromagnetic induction and a thermoplastic material layer incorporating a heat-sealing zone (2) which extends along the packaging material displacement direction; the heat-seal device comprising an alternating current generator, a coil (3, 5, 6) for transforming the alternating current into a magnetic field, a ferromagnetic element (7, 8, 10-13) for chanelling the magnetic field lines along a specific direction, the magnetic field being oriented so as to pass through the packaging material (1) to induce heating of the layer which can be heated by electromagnetic induction. Said heat-seal device is characterized in that it comprises an assembly of ferromagnetic elements (7, 8, 10-13, 19-21) which are arranged such that the magnetic field lines pass through the packaging material (1) in at least two different regions (14, 16-18) located along the heat-sealing zone (2).
Inventors:
THOMASSET JACQUES (FR)
Application Number:
PCT/CH2002/000699
Publication Date:
February 26, 2004
Filing Date:
December 16, 2002
Export Citation:
Assignee:
AISAPACK HOLDING SA (CH)
THOMASSET JACQUES (FR)
THOMASSET JACQUES (FR)
International Classes:
B23K13/02; B29C65/02; B29C65/04; B29C53/50; B29L9/00; (IPC1-7): B23K13/02
Foreign References:
| FR2073137A5 | 1971-09-24 | |||
| US4694134A | 1987-09-15 | |||
| US5571437A | 1996-11-05 | |||
| US3406271A | 1968-10-15 | |||
| US2632079A | 1953-03-17 |
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