HIGH FREQUENCY WELDING FOR THERMOPLASTIC RESIN

摘要

PURPOSE: To reduce cracks formed during a repeating operation for a long period by vibrating an ultrasonic welding horn in a frequency of 30 to 45 kHz while laterally moving by bringing a lap joint by the horn. CONSTITUTION: A transducer in an ultrasonic horn 18 and a transducer unit 30 are operated. An electric motor is operated to drive a feeding screw 56 at an initial predetermined speed to sequentially move a reciprocatingly movable carriage 44. The horn 18 is fed by the movement of the carriage 44 to become a compression engaging state with a lap joint. The carriage 44 and the horn 18 are moved along the joint at a predetermined lateral moving speed to form a welding seam. The moving speed of a decelerated initial contact speed reduces formation of a ridge raised at the seam of each belt.