Induction sealing device and method of sealing a packaging material using said induction sealing device
AssigneeTetra Laval Holdings & Finance S.A.
InventorsKarl Israelsson, Håkan Andersson, Marko Stajkovic, Louis Carlioz
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Abstract
The present invention relates to an induction sealing device for heat sealing of packaging material. The sealing device comprises a conductor partly encapsulated in a supporting body for cooperation with the packaging material during sealing. The coil conductor has a reduced cross sectional area at at least one position along the coil conductor so as to concentrate the magnetic flux induced by the coil conductor at the at least one position. The invention also relates to a method of heat sealing a packaging material using the induction sealing device.
Claims20
A method of heat sealing a packaging material, the method comprising the steps of:
- sealing together a first, inner edge and a second, outer edge of a packaging material blank in an overlapping area in which the two edges overlap using an induction sealing device, the induction sealing device comprising:
- a first conductive strip having a first cross-sectional area and a second cross-sectional area that is smaller than the first cross-sectional area;
- and
- a second conductive strip having a third cross-sectional area that is larger than the first and second cross-sectional areas;
- wherein, when the first, inner edge and the second, outer edge of the packaging material blank overlap, the packaging material blank has a first end and a second end, a length of the packaging material blank extending between the first and second ends;
- positioning the induction sealing device on an outer side of the overlapping area such that the second conductive strip is proximate to the second, outer edge of the packaging material blank;
- and
- positioning the induction sealing device over the overlapping area such that the first conductive strip is aligned with the first, inner edge of the packaging material blank and the second cross-sectional area is positioned over the first end of the packaging material blank.
Dependencies are inferred from the claim text.