By improving PP melt rheological properties, adjusting draw-texturing process, controlling winding tension and oil content, the crimping property of PP - BCF yarn can be improved effectively.

Adjusting filament tension by static friction during the course of winding, high tension of winding filament is controlled precisely with little wear and tear to it.

This thesis discusses winding tension control based on Fuzzy Adjusting theory, gives the design of Fuzzy PID controller and the experimental results.