| 摘要 |
The invention refers to the field of labelling of containers and in particular it refers to an ultrasound welding process for making tubular labels made of heat-shrinking film, wherein a sonotrode (4) covers an angle (²) greater than an angle (±) 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). |
