Tensile membranes structure high frequency welding machine. professional welding tents, air domes, banners, truckcovers. Tensile membranes high frequency welding machine 1. Professional for welding tent, canvas, inflatable PVC, fabric, tarpaulin products, blow ... , bath shade, air bed, oil bag, swimming ring, decorate board for cars, all PVC PET leather product. 2. Features:1) NL ...