FIELD: equipment for heat sealing of moving package material including layer that may be heated by means of electromagnetic induction, for example metallic layer and also thermoplastic layer.
SUBSTANCE: apparatus includes AC generator and winding for conversion of AC to magnetic filed crossing package material. Ferromagnetic members canalize force lines of magnetic field in predetermined direction and they are arranged in such a way that force lines of magnetic field cross package material at least in two separate zones along welding bath.
EFFECT: possibility for controlled heating directed strictly to welding bath that causes no deformation of package material.
8 cl, 5 dwg
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