The level of dry CV value of the yarn is not only direc […]
The level of dry CV value of the yarn is not only directly related to the strength of the single yarn strength and the unevenness of the yarn strength, but also uneven yarn defects such as coarse details, which affects the process of the weaving preparation stage, resulting in Weaving breakage can also seriously affect the fabric style and cause the machine to stop during the weaving process. The spinning process is the most critical process that affects the CV value of the yarn. Therefore, a reasonable and scientific basic spinning process configuration and how to better optimize some of the accessories in the drafting process of the ring spinning frame, in order to Achieving the improvement of uneven yarn formation is an important quality problem that textile enterprises must face.
Effect of quantitative on yarn formation
In production practice, a larger draft multiple will increase the chance of additional unevenness of the yarn. For spinning the same yarn with the same roving size, the larger the roving size, the larger the drafting multiple of the spinning frame and the larger the additional unevenness of the yarn. The ordinary ring spinning frame EJM128K and different rovings were used to perform the yarn formation test. It can be seen that the rovings with larger rations are used in the spinning process, and the spinning CV value of the spun yarns continues to increase, and the spinning has a trend Also, thick knots and neps in the yarn are also increased. A large amount of roving can reduce the workload of the spun yarn stopper to change the tube. However, the larger the roving amount, the worse the yarn formation may be. Therefore, it is recommended that the workshop use a roving with a weight of 4.3 g / (10 m). Combed cotton roving.
Influence of twist factor on yarn formation
Reasonable selection of twist factor directly affects the quality of the spun yarn, the CV value of the sliver, the thickness, and the details. From the analysis of various indicators, it is known that the additional friction boundary generated by the roving twist can effectively control the fiber movement, and the reasonable twist coefficient increases the tightness of the sliver, thereby increasing the pressure on the contact points between the fibers in the sliver. , Increase the cohesion between the fibers, the drafting slivers are closely connected without splitting, and are held by the upper and lower aprons without turning; during the spinning process, the speed change point of the fiber must be concentrated and stable and forward The jaw transfer requires that the control force of the rear jaw fibers on the planktonic fibers in the sliver is greater than the guiding force of the front jaws on the planktonic fibers, which will be more conducive to improving the uniformity of the sliver. The test shows that the yarn level is the best under the condition of a roving twist coefficient of 114. Considering that the roving used in the test is obtained from the proportion of short-staple cotton, the cotton fiber length is shorter and the fiber grade Poor, so using a higher twist factor is beneficial to the roving twist, so the selection of the roving twist factor 114 is more reasonable.
Influence of Spinning Twist Coefficient on Sliver
Production practice shows that the reasonable design of the yarn twist coefficient has a great correlation to the process production. The evenness, coarseness, and details of the yarn will deteriorate after the winding process. The scientific and reasonable twist coefficient design can effectively control the yarn. Degree of deterioration.