Loading patent…
AssigneeTetra Pak International AB
InventorsAnders Hilmersson, Gert Holmstrom, Hans Selberg
Estimating the term…
An arrangement for the sealing of thermoplastic-coated packing material of the type which includes at least one layer of an aluminum foil. The arrangement includes an inductor (3) connectable to a high-frequency source of current which is constituted of a U-shaped loop of electrically conducting material. The legs of the U-shaped loop are parallel and are situated close to each other, and the inductor (3) a core (10) of ferrite material between its legs. The core of ferrite material has local inserts (11) of ferrite material of substantially higher permeability than the surrounding portions of the core (10) and the local inserts (11) are installed in regions of the sealing arrangement where strong local heating is required in the sealing joint or where the sealing pattern needs to be influenced.
Apparatus for sealing thermoplastic-coated packing material having at least one layer of metal foil, the apparatus comprising a sealing jaw having a base of electrically non-conducting material and a core of ferrite material of a predetermined permeability, said sealing jaw including an inductor having a pair of substantially parallel conductors spaced apart from each other, an electrically insulating material between said conductors and said core, said core having a groove extending between said conductors, and said core having inserts of a second material provided at predetermined locations between said parallel conductors, said second material being of higher permeability than the predetermined permeability of said ferrite material.
A method for sealing a package manufactured from a packing material having thermoplastic layers that are fused together upon the application of heat and pressure, the method comprising:
Dependencies are inferred from the claim text.