ANALYSIS OF YARN MOTION IN SINGLE-NOZZLE AIR-JET FILLING INSERTION .2. EXPERIMENTAL VALIDATION OF THE THEORETICAL-MODELS AND STATISTICAL-ANALYSIS

The analytical models which were developed in Part I of this series are compared with experimental results. The models give good predictions of the insertion behavior and average yarn velocity considering the complexity of the yarn motion. Loop- and drum-storage systems are compared. A loop-storage system gives higher yarn velocities than a drum-storage system. However, there is better control on the yarn with drum storage than with loop storage. Since the filling insertion with an air jet is not positively controlled, pick-to-pick variations occur. Statistical analysis of experimental data was therefore performed.