... One leveler grooving roller machine Duct manufacture auto-line 4 ( duct machine )Advantages:Line consists of feeding metal frame, leveler grooving ... according to customer's requirement.The work theorycoiler-metal feed-leveler grooving rollCut feeding metal for ducts, or use ... forming machine, TDF hydraulic folder, auto cutting to length line, pipe bending machine , FN seam welder,notching and shearing ...