Heat-sealing device for packaging material

Details Heat-sealing device for packaging material Heat-sealing device for packaging material

2006-02-21

2006-02-21

Van, Quang (Department: 3742)

Electric heating

Inductive heating

Metal working

C219S613000, C156S272200

Reexamination Certificate

active

07002117

ABSTRACT:
Device for welding a moving packaging material (1) including a layer that can be heated by electromagnetic induction and a thermoplastic layer incorporating a welding zone (2) which lies in the direction of movement of the packaging material; the welding device includes 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 channeling the magnetic field lines in a specific direction, the magnetic field being oriented so s to cross the packaging material (1) in order to induce heating of the layer that can be heated by electromagnetic induction; the welding device being characterized in that it includes a set of ferromagnetic elements (7, 8, 10–13, 19–21) which are arranged so that the magnetic field lines cross the packaging material (1) in at least two distinct regions (14, 16–18) located along the welding zone (2).

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