A Study of the Fibre-transfer-channel Design in Rotor-spinning. Part I: The Fibre Trajectory

Abstract

An investigation is described in which high-speed cinematography was used to study the removal of fibres from the opening roller and their passage through the transfer channel during rotor-spinning. From the results obtained, it was concluded that short fibres would escape the pin-clothing of the opening roller in the region of the trash box. These fibres pass over the knife edge of the transfer-channel interface and are then drawn back into the mass of flow down the channel. Longer fibres will remain with their leading ends hooked around the pin-clothing, while their trailing lengths are ejected from the opening roller and bend over the knife-edge before the fibres are pulled down into the channel. An analysis of the transfer-channel design showed that a narrow rectangular cross-section, as opposed to a circular one, was more conducive to fibre-straightening.