Real-time yarn evenness investigation via evaluating spinning triangle area changes

Abstract

This paper examines the relationship between changes in the spinning triangle dimensions and evenness of the finally produced yarn. Three kinds of yarn (in different twist levels) were produced and during the spinning process a digital camera was used to record the production process and the triangle behaviour in front of delivery rollers. Using image-processing techniques, three parameters of the triangle (width, length and area) were measured. Then, the correlation between yarn irregularity and changes in the triangle dimensions (with regard to wavelength changes) were evaluated. The acceptable correlation between yarn irregularity and dimension changes indicated that this novel image-processing approach can be implemented in measuring yarn irregularities during the spinning process.