The new invention pertains to a twisting nozzle and a method for producing fine, knotted yarn with a high regularity of the knots, with the help of air nozzles with a yarn treatment channel. The blast air is blown in, transverse to the air treatment channel. The blast air thereby forms a double twist in yarn run direction as well as against the yarn run direction, for generating the knots. For this, it is suggested that the blast air in the inlet region into the yam treatment channel gets converted in a short air twist chamber in yarn channel longitudinal direction into two strong, steady twist flows undisturbed by filament bundles. In spite of the tiny nature of the air twist chamber, which projects max. 0.5 mm or 5% to 22% of the yarn channel width (B) beyond the yarn channel longitudinal wall, the regularity of the knots can be highly improved. It is further possible, depending on the pressure of the blast air, to generate hard or soft knots that get released again.
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