Heat-sealing device for packaging material

B - Operations – Transporting – 65 – B

Patent

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Details

B65B 51/10 (2006.01) B23K 13/02 (2006.01) B29C 65/30 (2006.01)

Patent

CA 2470077

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).

Dispositif de soudage d'un matériau d'emballage (1) en déplacement comprenant une couche que l'on peut chauffer par induction électromagnétique et une couche de matière thermoplastique incorporant une zone de soudage (2) qui s'étend selon la direction du déplacement du matériau d'emballage; le dispositif de soudage comprenant un générateur de courant alternatif, une bobine (3,5,6) pour transformer le courant alternatif en un champ magnétique, un élément ferromagnétique (7,8,10-13) pour canaliser les lignes du champ magnétique selon une direction déterminée, le champ magnétique étant orienté de manière à traverser le matériau d'emballage (1) pour induire un chauffage de la couche que l'on peut chauffer par induction électromagnétique; le dispositif de soudage étant caractérisé par le fait qu'il comprend un ensemble d'éléments ferromagnétiques (7,8,10-13,19-21) qui sont disposés de manière à ce que les lignes de champ magnétique traversent le matériau d'emballage (1) en au moins deux régions distinctes (14,16-18) situées le long de la zone de soudage (2).

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