Abstract:

In order to measure accurately the torque of the yarn to match the yarn steaming standard, and to reduce the probability of skewed weft in fabrics due to the residual torque of the yarn, a method was proposed to detect the torque of yarn with the use of a free rotor as the core. Firstly, the free rotor was connected to the end of the yarn before starting to rotate smoothly under the action of electromagnetic damping. The photoelectric sensor was placed to scan the rotating status and to transmit the captured photoelectric signal to the computer, for studying the relationship between the rotor's rotation angle and time to obtain the angular acceleration versus time curve by means of the second order of differentiation using Origin. Upon the availability of the initial angular acceleration of the rotor from the curve, and the torque of the test yarn can be quickly and efficiently obtained by multiplying the initial angular acceleration and the rotor's rotational inertia. The experimental results show that the method can accurately measure the torque of various yarns with small relative error, which not only has a broad application prospect in today's textile production testing, but also provides a new way of thinking in the field of yarn torque research.

Key words: yarn, torque, free rotor, photoelectric sensor, angular acceleration, rotational inertia