Patent ID: 7129450

Claim:
A method for manufacturing packages, comprising providing a tubular first package part of a sheet of thermoplastic coated packaging material including at least one layer of an induction heatable material, the first package part having a sealed first joint between two mutually opposing edge sections of the sheet, joining together the first package part and a second package part, a second joint being formed between the first and the second package part, the first and the second joint intersecting each other, arranging induction heating means including at least two conductors extending along each other, so that the conductors extend along the second joint, and sealing the second joint by feeding an inducing current through the induction heating means such that the inducing current is conducted along the second joint by the at least two conductors and is guided by the at least two conductors such that one of the at least two conductors guides the inducing current in one specific direction and the other of the at least two conductors guides the inducing current in another specific opposite direction, and a sealed subjoint of the second joint is achieved by each one of said at least two conductors.