| 摘要 |
<p>Two or more layers, at least one in thermoplastic, are fed continuously to an ultrasonic welding station (6) where a rotary anvil (8) is turned relative to a sonotrode (7). Layers are united in a single stage by ultrasonic welding, simultaneously weakening the weld (28) into a location of intentional separation. An Independent claim is included for corresponding equipment. The multilayer product is also claimed. Preferred features: At the site of welding, tensile strength is less than that of the non-welded layers. Degree of weakening is controlled by varying the gap (14) between sonotrode and anvil. Speed of welding is 70-200 m/min, preferably 150-200 m/min. Anvil rotation speed corresponds approximately with that of sheet feed, during welding. It does not, between welding operations. During one complete turn of the anvil, separate welding operations are carried out. The weld seam meanders. The anvil is heated. Near the welding point, layers are detachably connected by ultrasonic welding, at an offset consolidation point. This takes place at the same time as welding. Such stations precede and follow the welding location. The consolidation seam meanders. Following ultrasonic welding, the material is parted into separate pieces, after which the welded layers remain connected to each other.</p> |
