Patent ID: 8366859

Claim:
Method for sealing a first packaging material laminate to a second packaging laminate, at least the first laminate comprising at least one layer of magnetizable particles and a sealable layer, the method comprising: providing an alternating magnetic field to the first and second packaging laminates in a sealing zone to generate magnetic hysteresis losses in the laminate comprising the magnetizable particles and create heat substantially melting the sealable layer in the sealing zone, wherein the magnetic field is provided by at least a sealing jaw, the sealing jaw including an inductor comprising a conductor connected to an alternating current supply which supplies current to the conductor, and wherein the magnetic field provided by the sealing jaw is enhanced by an electrically conducting anvil opposed to the sealing jaw, the anvil being passive and inducing a current in response to the current in the conductor of the sealing jaw, thereby generating a magnetic field enhancing the magnetic field generated by the sealing jaw, and applying a sealing pressure to the first and second packaging laminates to press together the first and second packaging laminates in the sealing zone, thereby sealing the first and second packaging laminates to each other.