... Covers,Canvas,Membrane. Antiflash NL-5557,CE Stationary High Frequency Welder For Tarpaulins, Tents, Billboards, Signs, Truck CoversThe ... Series of High Frequency welding machine for Tarpaulins,Tents,Billboards, Signs,Truck Covers, ... time, the longest is 1200mm Adopting high sensitive antiflash device NL5557 .avoid damaging the mould.Higt quality imported ...