Research on Colored Spinning Technology Based on NC Coupling Drafting Theory and Distributed Control of Color Pattern of Its Products

To adapt to the market requirement of personalized and high-end colored spun yarn,this research develops a colored spinning technology based on NC coupling drafting theory.The key of this technology is that two combined back rollers are driven by two servo motors and form two independent drafting zone with middle roller.Segment color yarns with equal linear density are formed at the jaw of front roller by adjusting the speed of servo motor to control the random and coupled draft ratio of two thick yarns.This paper analyzes the basic principle of bi-component coupling drafting,infers the basic equation of distributed control of color pattern and verifies the designability and reproducibility of random color pattern of segment color yarn with equal linear density with an experiment.