VORRICHTUNG ZUM ULTRASCHALLSCHWEISSEN VON BAHNEN

摘要

An apparatus for joining sheets of thermoplastic material by ultrasonic vibration welding in which the welds are formed between the working surface of an ultrasonic resonator and opposing surfaces of anvils arranged in a changing pattern; means are disclosed for modifying the total energy transmitted by the resonator to the portions of the sheet material between the resonator and anvils so that the amount of energy is greater for a higher total surface area and less for a lower total surface area of the opposing surfaces of the anvils.