... -ton per station)l Straightening/flattening - Pneumatic controlled straightener l Pneumatic controlled ring type beading rolls with five beading rings- ... shorten working time, a perfect match to duct auto line l Duplex TDF flange former, forms TDF flange by ... by inline position of machines, guarantees high efficiencyl Accurate PLC control unit, preset available profiles and folding style, notching ...