Tetra Laval Holdings & Finance S.a.

Alessandro Boschi

Rossano Guerri

Mirco Lancellotti

A method of controlling an inductive heating circuit, having a varying load, to seal a packaging material is provided. The method comprises generating AC power of at least two frequencies on at least one inductor in the inductive heating circuit; determining of the resulting phase shift in the inductive heating circuit from the current generated at the at least two frequencies; determining the impedance of the inductive heating circuit for each of the at least two frequencies; determining a load characteristics of the inductive heating circuit based on the relationship between the determined impedance and the determined phase shift; determining an impedance operating range; and selecting an AC output frequency for an induction power generator based on the load characteristics which results in the least amount of phase shift from a set ideal value and which is associated with an impedance that is within the impedance operating range.

Method of controlling an inductive heating circuit to seal a packaging material

A device for adjusting the transverse position of a strip of packaging material on a packaging machine for producing packages containing a pourable food product, the device having a slide movable crosswise with respect to the strip and carrying a gripping member for moving the strip transversely; and a system for automatically adjusting the position of the slide in response to signals generated by optical sensors for detecting respective limit positions of the strip.

Device for adjusting the transverse position of a strip of packaging material

A method of fitting pull-off tabs ( ), made of heat-seal material, to strip packaging material ( ) having a number of through openings ( ) and covered, on the opposite side to that to which the tabs ( ) are fitted, with at least a first and a second lamination layer ( ) made respectively of heat-seal material and electrically conducting material and covering the openings ( ); the method including the step of joining each tab ( ) to the packaging material ( ) at a respective opening ( ) by simultaneously performing hot-plate sealing and induction sealing operations. (FIG. )

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Gualtieri, Italy

Alessandro Boschi