... metal frame, leveler grooving roll DUCT MANUFACTURE AUTO-LINE 5 ( duct machine )Line combines a feeding metal frame, leveler grooving roll ... fold with TDF folder to produce,,shear,fold-seal with sealing machine to form TDCWork FlowOur main products: spiral tube ... flange forming machine, TDF hydraulic folder, auto cutting to length line, pipe bending machine , FN seam welder,notching and shearing ...