| 摘要 |
An ultrasonic sealing jaw (1), an apparatus and a method is provided for sealing portions of plastic film to a tube so as to form a sealing engagement of the portions of plastic film around the circumference of the tube, the sealing jaw (1) comprising a concave portion (7) for receiving the tube covered by the plastic films the concave portion (7) being adapted to form the foil-tube attachment, and, adjacent to at least one side of the concave portion (7) of the sealing jaw (1), a substantially flat portion (3, 4) for engaging the plastic film and sealing adjacent portions of plastic film to each other in an area adjoining the tube, said flat portion (3, 4) defining a top plane (10) of the sealing jaw (1), wherein the substantially flat portion (3, 4) comprises along the edge towards the concave portion (7) at least one recess with a surface (11) so as to form a cavity (12) with an opening towards the concave portion (7). |
