Fully automatic ventilation duct system;There are two option, one is a piece of fabric folded in half and two pieces of fabric stitching;After the patchwork is completed, it will automatically enter the cylindrical welding process. The next step is to automatically splicing the buttonholes on the edge of the cylinder, and finally winding.Features and benefits:1. Hot air welding, continuous production;2. Multiple welding heads for comprehensive machining of finishing applications;3. Precise fabric placement;4. Automatic folding fabric.Spiral and flexible ducting products are in demand for a number of industries including agriculture, building, mining and ventilation. we offer variable wire diameter and wire pitch. We have the machine for any size ducting, ventilation or hose.