Blowing nozzle for transporting a flexible thread

A blowing nozzle for transporting a flexible thread, comprising a supply channel for the thread, the exit end of said channel being surrounded by an annular orifice, a connection for supplying a flowing pressurized fluid to the upstream side of said orifice, and an elongated mixing tube which is arranged to receive the thread as well as fluid discharged from said orifice and which substantially forms an extension of said channel, wherein the improvement comprises a sleeve which surrounds only the outflow end portion of the mixing tube, the upstream end of the sleeve having a sealing engagement around the mixing tube, and the downstream end of the sleeve lying in substantially the same plane as the downstream end of the mixing tube, a sleeve-shaped filling piece which fills the space between the downstream end portion of the sleeve and the mixing tube and which contains axial exhaust channels and a connection for supplying a flowing pressurized fluid to the interior of the sleeve upstream of the filling piece.