... Covers,Canvas,Membrane. Antiflash NL-5557,CE High Frequency PVC welding machine For Tarpaulins, Tents, Billboards, Signs, Truck Covers ... welding machine for Tarpaulins,Tents,Billboards, Signs,Truck Covers,Canvas,Membrane. Main Application of High Frequency welding ... of large format tarpaulins, tents, shading systems, truck covers, swimming pool covers, airline hangars, billboards, signs, side curtains ...