When welding plastics using Ultrasonic, the interface of the two parts is specially designed to concentrate the melting process. The vacuum form (lid) usually has a spiked energy director which contacts the second plastic part (back side).
The Ultrasonic energy melts the point contact between the parts, creating a joint. This process is a good automated alternative to glue and adhesive materials, connected the most of thermoplastics like PVC, PET, OPS, PP.
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