Patent ID: 6824632
Filing Date: 2004-11-30
Classification: B29C,B29L,Y10T

Abstract:
An ultrasonic device for sealing at least two superimposed sheets, said device comprising:a sealing assembly consisting of two elements which are respectively an anvil and a sonotrode, arranged opposite each other so that their facing surfaces form an interstice for passing through the sheets to be sealed, said interstice having an inlet section and an outlet section; the sonotrode vibrating at high frequencies to emit ultrasonic waves; wherein means are provided for generating between the superimposed sheets and said sealing assembly, a relative movement along a specific feeding direction relative to the sealing assembly; the section of said passage interstice decreasing between its inlet section and its outlet section; and at least one element of said sealing assembly comprising a projecting sealing ridge emerging into said passage interstice and extending along a direction globally parallel to said feeding direction.