High frequency tarpaulin welding machine professional design for tents, canvas, PVC fabric tarpaulin products sealing High frequency tarpaulin welding machine1.NL-5557 anti-spark vacuum tube protection device;2.With double sides skates, accurate position and flexible action;3.Usage:PVC material high frequency welder is suitable for tents, tarpaulin, PVC coat fabric, ceiling, proof welding.4. ...