Spinning limits of the friction spinning system (DREF-III)

The spinning limit is described as the finest yarn count with acceptable qualities such as evenness and strength. Since we need to know about th: parameters of the friction spinning system and their effects on the spinning limits, this work investigates the DREF-III spinning system. Different speeds of the spinning drum are tested at a constant delivery speed (150 m/min) using 100% polyester fibers. Spinning drum speed has a significant influence on yarn tenacity, elongation, and thick places. The lowest spinning drum speed results in the lowest elongation and higher tenacity. We also use three different core-wrap ratios to study their effects. The core-wrap ratio has a direct effect on yarn modulus, tenacity, and elongation. While initial modulus and tenacity increase with increased core-wrap ratio, elongation decreases. Yarn count has a significant effect on yarn mechanical properties and uniformity. Machine condition and sliver quality may cause differences in yarn formation. In order to determine the finest possible spinnable yam count, we test different yarn counts ranging from the coarser 98 tex (6's) to finer yarn counts. The 49 tex (12's) yarn count with 70/30% core-wrap ratio is the finest spinnable yarn count with reasonable quality.