Main Features: when sparks arise,the specialelectronic circuit cut off the high frequency automatically,to protect electrode and product.Sparks electronic tube protection device. Main usage: PVC sealing ,welding for shoes,PVC materials ,stationary.toys ,leather .packaging Specification: ModelBDS-4000ABDS-5000ABDS-8000AH.F. power4000W5000W8000WVoltage 50/60HZ AC380V 3PInput power 7KVA 9KVA 15KVARectifier SILICON DIODEOscillator tube 7T84RB 7T85RB/E3185 7T69RBWays of prssure AIR PRESSUREMAX. space between poles 250mmUpper pressing boardsize 200*350 200*350 400*600Working plate size 400*600 400*600 600*800Dimensions(mm) 660*1350*1730 660*1350*1730 1000*1800*2500Net Weight 400kg 400kg 500kg Principle of Ultrasonic Plastic Welders: Ultrasonic plastic welders operate by inducing ultrasonic frequencies in plastic components that is converted into heat between the welded plastic laminates. Frictional heat is produced so that thermoplastic parts melt and an insoluble connection between parts is forged in a very short period of time. The melting points of both working pieces is nearly equivalent which helps to form a uniform weld area. The welded area is usually as strong as the matrix material.The manufacturer has the right to modify the design and parameter without prior notice