| 摘要 |
The invention describes a method of joining films made from at least one layer from the group comprising polyethylene, polypropylene polyamide and polyethylene terephthalate by welding. In order to produce the join, which is specifically required to withstand higher dynamic loads in terms of its strength, the materials are heated by ultrasound in the region of the contact layer as proposed by the invention until they have at least softened, and actively laterally and vertically intermixed by continuing to apply ultrasound.
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