| 摘要 |
<p>Apparatus and method for securing a thermoplastic strap around a package by compressing the overlapping strap end portions together and moving one of the overlapping end portions in a transverse direction relative to the other at a very high frequency and small amplitude to melt and fuse the interface regions therebetween. The transducer used to produce the ultrasonic vibrations is supported solely at its nodal point where it is vibration free.</p> |
