A Contribution to Residual-torque Evaluation by the Geometrical Parameters of an Open Yarn Loop

Abstract

An account is given of an experimental investigation of the snarling of different yarns by the use of a simple determination of free-hanging open-yarn-loop geometrical parameters. The experimental results enabled the relative importance of individual loop parameters to be compared, the reproducibility of the results obtained to be investigated, and their dependence on the yarn-twist level to be determined. The differences in conventional-yarn and rotor-spun-yarn torsional rigidities and their influence on the results were established, as would be expected. This simple method is recommended as one that gives a good indication of the behaviour of various spun structures under torsion.