ULTRASONIC SEALING DEVICE, RELATED METHOD AND PACKAGE

摘要

The invention concerns an ultrasonic device (100) for sealing at least two superimposed sheets (1, 2), said device comprising a sealing assembly consisting of two elements which are respectively and anvil (102) and a sonotrode (101), arranged opposite each other so that their facing surfaces (101', 102') form an interstice (103) for passing through the sheets to be sealed, said interstice having an input section (104) and an output section (105), the sonotrode vibrating at high frequencies to emit ultrasonic waves. The invention is characterised in that means are provided for generating between the superimposed sheets and said sealing assembly a relative movement along a specific feeding direction (F) relative to the sealing assembly, and the section of said passage interstice decreases between its input section and its output section, and at least one element of said sealing assembly comprises a projecting ridge emerging into said passage interstice and extending along a direction globally parallel to said feeding direction (F). The invention also concerns a related method for sealing flexible packages, and the resulting packages.