... time.(6) suitable for very large plastic welding.Principle of Ultrasonic Plastic Welders: Ultrasonic plastic welders operate by inducing ultrasonic frequencies in ... , packaging industry, toy industry and so on.Such as plastic body parts, car doors, car dashboard,lights,mirrors, sun ... floppy disk, U disk, SD card, CF card, USB connectors,Bluetooth.Toys,stationery: folder, album, folding boxes,PP hollow ...