... CE High Frequency PVC welding machine For Tarpaulins, Tents, Billboards, Signs, Truck Covers.The Series of High Frequency ... welding machine for Tarpaulins,Tents,Billboards, Signs,Truck Covers,Canvas,Membrane. Main Application of ... shading systems, truck covers, swimming pool covers, airline hangars, billboards, signs, side curtains and many other general technical fabric ...