The “hard end” of the spun yarn will affect the quality of the spun yarn, the end break, the stand and mood of the stopper, and the production efficiency. In serious cases, the management workload and production costs will be increased. Therefore, the cotton spinning enterprises pay special attention.
How can we prevent stiff heads? How can heavy weight and large twist coefficient rovings come out of spun yarns? With problems, in more than an hour of explanations and interactive exchanges, Mr. Zhao Jianwei shared specific methods with practical cases.
Teacher Zhao Jianwei first analyzed the advantages and disadvantages of large twist coefficient rovings to improve the quality of spun yarns. The advantages are: improved sliver, reduced hairiness, reduced coarseness, detail, neps, and increased strength; the disadvantage is: if the phenomenon of "hard head" Increased end breaks, worsened quality, increased yarn defects, and a series of problems followed.
He believes that the large twist factor is a double-edged sword, which can improve the quality if used well; He combined the three classic cases in the previous consultation and diagnosis process, analyzed the improvement in quality of different roving twist factors of spinning cotton, viscose, and polyester-cotton under the same spinning conditions, and then listed the "hard-end" of the fine yarn. Seven kinds of situations and causes are proposed, and six key measures and key points in the implementation process should be pointed out, and the effectiveness of the measures is demonstrated with examples. At the same time, two companies' use of quantitative Twist rovings have brought successful experience of improving quality, reducing costs and increasing efficiency for enterprises, and have provided a reference for enterprises to prevent "spinning" of spun yarns and correctly use rovings with large twist coefficients.
