This paper reports the results of an in-depth investigation into why the measured twist of rotor-spun yarns is dependent on the spinning process parameters, especially fibre properties. The investigation focuses on the study of yarn structure using a visual measurement method in conjunction with the use of tracer fibres. The measurement system is based on computer analysis of digitised video images of the yarn. The system can reveal the twist level within different radial layers of the yarn. The results show that rotor-spun yarn structures are affected by fibre properties and the difference in yarn structure is the main cause for the apparent twist difference reported previously.
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