A method and a device for heat sealing multiple plies of a laminate from which gable top packaging can be produced, wherein the laminate has a carrier layer made of electrically non-conductive material and a sealing layer made of thermoplastic material on at least one surface of the laminate. To heat seal multiple plies of a laminate in a high-frequency alternating electric field, the alternating electric field is generated by a first lead of an HF voltage supply in a first sub-region of the sealing region and is generated by a second lead of the HF voltage supply, differing from the first lead, in at least a second sub-region of the sealing region, so that a different heat distribution is obtained over the sub-regions of the sealing region.

A forming device and method for use in a packaging machine of the type where packages are produced from a tube. The forming device comprises two opposing sealing elements between which the tube is arranged to be flat-laid and squeezed to heat the thermoplastic and obtain a first transverse seal of the tube. It further comprises two volume control elements. The forming device is characterized in that it is arranged to displace the first transverse seal off-center in relation a longitudinal axis of the first portion of the tube in a displacement direction essentially perpendicular to the first transverse seal to enable later shaping of a corresponding final package with a wall arranged with a predetermined angle of inclination in relation to the displacement direction. The invention also relates to a machine, a process and a packaging laminate.

The device for welding thermoplastic parts includes a matrix for positioning the parts to be assembled, the matrix including an amagnetic insulating insert that defines joining zones in which the welds must be produced, a bladder defining a sealed volume and means for producing a partial vacuum in the sealed volume, and means for moving a magnetic induction head to near the joining zones and without making contact with the bladder. The welding process includes positioning at least one first part, then of placing metal inserts on areas of the first part corresponding to the joining zones that must be welded, and then positioning at least one second part. A bladder is put in place covering the parts and a partial vacuum is created in the volume defined by the bladder. The magnetic induction head is moved to produce the weld bead without contact while the partial vacuum is maintained.

A magnetic insert for enhancing the magnetic field of an induction heating device is provided. The magnetic insert is manufactured by use of a composition comprising a mouldable polymer matrix and a soft magnetic material.

A method and apparatus for joining parts. A plurality of conformable induction coils embedded in a number of elastomeric sheets is positioned relative to a first composite part of the parts and a second composite part of the parts. A magnetic field is generated with the plurality of conformable induction coils. The magnetic field is configured to generate heat in a magnetically permeable material at a joint location. The heat joins the first composite part and the second composite part to each other.

An apparatus for sealing an open end of a package comprises a first longitudinally extending sealing jaw, bearing mounted on a first eccentric shaft rotatable around a first rotational axis, and a second longitudinally extending sealing jaw, bearing mounted on a second eccentric shaft rotatable around a second rotational axis, the second sealing jaw being parallel with the first sealing jaw. At least one motor drives rotation around the first and second rotational axis in opposite directions, wherein the first and the second sealing jaws oppose each other, and are allowed to oscillate between sealing and open positions by moving towards and away from each other. A first and second transversally extending guiding bar cooperate with the first and second eccentric shaft via guiding pins running in guiding grooves, such that transverse play between the first and the second eccentric shaft and the first and second sealing jaw is allowed.

A device and method for inductively heating package sleeves including: at least one unit for producing an alternating current, at least one inductor having at least one effective section, and a holding unit having a front holding area and a rear holding area for mounting the inductor, wherein the inductor is connected to the unit for producing an alternating current, and wherein the holding areas arranged in such a way that a gap is formed between the front holding area and the rear holding area, the longitudinal direction of which gap corresponds to the conveying direction of the package sleeves. The effective sections of the at least one inductor may be at least in sections arranged asymmetrically to one another in relation to a center plane lying in the gap.

An inductor for transverse sealing a packaging material tube filled with food product comprises a main body comprising first and second sealing surfaces facing the packaging material during a sealing state, a recess in the main body for receiving a knife during a cutting state, and an electric conductor arrangement, in the main body for inducing eddy currents in the packaging material during the sealing state. The first/second sealing surfaces each comprise a top section, an inner sealing section between the recess and the top section, and an outer sealing section between the top section and an outer edge of the inductor. The inner sealing section is inclined towards the recess, and the outer sealing section is inclined towards the outer edge, so that product in the tube is pushed away from a sealing band of the tube as the first/second sealing surfaces are pressed towards the sealing band.

An anvil for forming a transversal sealing of a sleeve-shaped portion of packaging material holding a liquid product, said anvil comprising a main surface, in operation, facing the tube, and a ridge provided on the main surface, the ridge comprising a first section and a second section, wherein the first section of the ridge is placed below the second section such that, in operation, a stress in the packaging material formed by a hydrostatic pressure formed by the liquid product is shifted from a first part of the sleeve-shaped portion placed above the first section of the ridge to a second part placed above the second section.

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.