... .spark tube:US5557 High Frequency Plastic Welding Machine Mahcine Types1. Double Side Trample2.Rotary type, Push type3.High Frequency PlasticWelding Machine ... , special plastic material (PE, PS, PC, PET and APET). Blister packing (double blister welding, blister and card welding), leather stamp, logo, writing case, toys ...