An apparatus for sealing by surface fusion of mutually facing surfaces of thermoplastic materials or coatings, and the use of a giant magnetostrictive powder composite for this purpose

摘要

The disclosure relates to an apparatus for the ultrasonic sealing of thermoplastic materials and comprises a vibration generator (2) of a so-called giant magnetostrictive powder composite (GMPC) which is secured in a jaw and has been given a cross-sectional area which progressively reduces seen from the anchorage point and whose free end displays a narrow working surface. The vibration generator (2) is surrounded by a coil (3) for generating a magnetic field.