TDF system is divided into three types: T-12, T-15, duplex machine 2-T12. Both sides of T-12 and T-15 are formed at the same time, one side forms into trans-verse flange shape “  ”, and the other side forms crooked clip shape “  ”.  Both sides of duplex machine Z-T12. are formed into “  ” shape at the same time. Its width range can be adjusted from 300mm to 1530mm.