Theory and practice for visualization of ring spun slub-yarn parameters

The traditional process of analyzing the parameters of the ring spun slub-yarn is time-consuming and sets very high requirement for the workers′ experiences.To solve this problem,the capacitance-type sensor is proposed to turn the variety of the yarn line density to the change of the voltage,and the data of the voltage can be acquired by DAQ(data acquisition card).Fourier transform,dynamic threshold and condition filtration are used to process the original signals and transform them into square wave signals.After these steps,the parameters of the slub-yarn,including slub length,slub distance,slub amplitude and the circle rule of the slub yarn,can be acquired.Based on the analysis of the slub length and the slub distance,a new theory for visualization of slub-yarn parameters is proposed.By this theory and the works′ experiences,the cycle of slub-yarn can be recognized efficiently.