Air-jet spinning apparatus

A method for producing a yarn or roving by winding core fibers with winding fibers in an air spinning device, wherein the air spinning device includes a hollow spindle having a spindle tip and a spindle opening, a nozzle body, and an outlet channel having a ring-shaped cross-sectional area between an outside surface to the spindle tip and an inside surface of the nozzle body, comprising:

• introducing fibers into the air spinning device via a fiber guide element and dividing the fibers with an eddy current produced in the nozzle body into core fibers introduced directly into the spindle opening, winding fibers that are captured at one end in the core fibers and are wrapped around the spindle tip at the other end, and discharge fibers that are removed by air flow along the spindle;
• forming at least two air flow constrictions within the outlet channel that cause the discharge fibers to be captured by the winding fibers and introduced into the yarn or roving before being discharged, wherein the number of discharge fibers is reduced by the air flow constrictions;
• and
• wherein the constrictions are formed with a ring-shaped cross-sectional area that is smaller than the ring-shaped cross-sectional area of the outlet channel on upstream and downstream sides of the constrictions.