Enhancing the Spun Yarn Properties by Controlling Fiber Stress Distribution in the Spinning Triangle with Rotary Heterogeneous Contact Surfaces

Abstract

Control of tension distribution in the spinning triangle region that can facilitate fiber motion and transfer is highly desirable for high quality yarn production. Here, the key mechanisms and a mechanical model of gradient regulation of fiber tension and motion with rotary heterogeneous contact surfaces were theoretically analyzed. The linear velocity gradient, effected on a fiber strand using rotary heterogeneous contact surfaces, could balance and stabilize the structure and stress distribution of spinning triangle area, which could capture exposed fiber to reduce hairiness formation and enhance the internal and external fiber transfer to strengthen the fiber utilization rate. Then, varied yarns spun without and with the rotary grooved and rotary heterogeneous contact surfaces were tested to compare the property improvement for verifying above-mentioned theory. The hairiness, irregularity, and tensity of the yarns spun with rotary heterogeneous contact surfaces spun yarns were significantly improved compared to other spun yarns, which effectively corresponded well to the theoretical analysis. Based on this spinning method, this effective, low energy-consuming, easy spinning apparatus can be used with varied fiber materials for high-quality yarn production.

Controlling the Fiber Stress Distribution with Variable-Frequency Step Roll for Tunable Spun Yarn Structures

“…In compact spinning, a fiber control device is installed in front of the yarn-forming triangle area, which applies a balanced stress on the fiber strands to reduce their width, controlled by airflow, resulting in a ring-spun yarn with tight, clean surface structure and high breaking strength [13,14]. Moreover, groove spinning uses the gradient-changed linear speed of the non-uniform contact surface to balance the fiber stress on both sides of the yarn-forming triangle area, which enables the inter-fibers to be fully transferred with a tighter surface structure and better hairiness and tensile properties [15]. These spinning methods regulate the fiber stress on both sides of the ring-spinning triangle, improving the yarn structure and performance by decreasing the stress difference on the edge fibers [16,17].…”