The Formation and Structure of Fancy Yarns Produced by a Pressurized-air Method

By injecting pressurized air into the fibre-transport channel of a rotor spinner, the normal steady-state conditions are deliberately changed, and thus a fancy yarn is achieved. In order to try to understand how the effects in the yarn are built up, the fibre flow through the spinning process is looked at theoretically and to some extent practically. Since the twist normally varies along a fancy yarn, this theme is dealt with theoretically and by studying enlargements of the fancy yarn. Production limitations in the form of a somewhat reduced breaking strength are considered.