Automatic rotary marking machine for in-line hot-marking with coloured ribbons of pipes in PVC, UPVC, CPVC, ABS, PE, PEX, PP, PPR and NYLON from min. diameter Ø12mm to max. diameter Ø400mm. The machine must be installed between the cooling tank and the haul-off. The coloured ribbon placed on the roll-holder slides between the marking stamps – designed and made by Gnata – and the pipe: the marking wheel is heated and thermoregulated and allows the hot-marking through thermal transfer of the writing on the pipe. The fusion of the surface of the pipe with the coloured ribbon grants a coloured marking without the need of inks or solvents.