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AssigneeSidel Holdings & Technology SA
InventorsLuigi Panzetti, Vanni Zacche'
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The invention refers to the field of labelling machines that use tubular labels, and in particular it refers to ultrasound welding apparata for making a tubular label made of a heat-shrinking film, precut from a coil. The apparatus provides for the label welding for the whole length of the surmount (5), the apparatus being able to translate on at least two Cartesian axes; moreover, it guarantees one or more welding beads due to the presence, on the sonotrode, of a plurality of ribs (6): the formation of one or more beads will have to be attributed to the more or less correct position of the precut label and the errors caused during its transfer. The presence of many beads is an improving condition of the resistance to tensile stress of the welded label.
Labeling machine with ultrasound welding device (2) for making a tubular label (3) made of heat-shrinking film starting from a film section whose vertical edges are taken to overlap, characterised in that it comprises an ultrasound welding device assembled on a turret and able to make a sonotrode perform movements that are adapted to guarantee a contact of the sonotrode itself with a label surmount, movements being according to two cartesian axes in order to take it in contact with the surmount and along a whole height of the surmount or the label.
(canceled)
Ultrasound welding process for making tubular labels made of heat-shrinking file, characterised in that a sonotrode (4) covers an angle (β) greater than an angle (α) formed by a surmount (5) of a label (3) to be welded, guaranteeing the welding contact also with position tolerance errors of the surmount (5) due to transfer clearances or errors of the label (3).
Dependencies are inferred from the claim text.