An adhesive-aided ring spinning for improving cotton yarn quality with the aid of sodium carboxymethyl cellulose solution

Abstract

An adhesive-aided ring spinning was developed to improve cotton yarn quality through the wetting and adhesion effect of an adhesive solution, namely, sodium carboxymethyl cellulose solution on fibrous strand in yarn formation zone during spinning process. The spinning mechanism of the adhesive-aided ring spinning with sodium carboxymethyl cellulose solution was analyzed, and the effects of two factors, that is, speed ratio (the ratio of the linear surface velocity to the output speed) and sodium carboxymethyl cellulose concentration, on the yarn performance are investigated. The experiment results reveal that the adhesive-aided ring spinning with sodium carboxymethyl cellulose concentration of 0.7% can significantly reduce yarn hairiness indicated by the hairiness S3 value reducing to 69% and still showing a prominent reduction (65%) after winding process. It has been found that a slightly faster linear surface velocity of the cylinder of the adhesive-aided ring spinning compared with the output speed of the yarn is more beneficial to the reduction of yarn hairiness S1+2 value. Meanwhile, the higher sodium carboxymethyl cellulose concentration also contributes to a higher breaking strength (increasing from 18.24 to 21.12 cN/tex) and lower breaking elongation (reducing from 4.98% to 4.08%). The abrasion resistance of adhesive-aided ring spun yarns also shows an obvious improvement of 12.8%. Therefore, the newly developed adhesive-aided ring spinning with the sodium carboxymethyl cellulose solution provides an effective method to enhance the quality of cotton yarns.

Prediction Model of Rotor Yarn Quality Based on CNN-LSTM

“…As shown in Figure 14, when predicting yarn strength, one layer of LSTM, two layers of LSTM, and three layers of LSTM were used, and the MSE value decreased only slightly. From the point of view of reducing computation, computing time, and saving resources, this model chooses one-layer LSTM [20][21][22] Momentum, and Adam optimization algorithms. These four optimal algorithms have their own characteristics, SGD (Stochastic Gradient Descent) trains for large samples; Adagrad (Adaptive Gradient Algorithm) is an improvement of SGD to improve its robustness; Momentum is also an improvement on SGD, which can accelerate the convergence of SGD and has a strong inhibition on convergence oscillation; Adam (Adaptive Moment Estimation) only needs to give an initial learning rate, and can adapt the learning rate according to the situation in the training process [23,24].…”

Study on Gathering-and-twisting Mechanism of Fibers and CMC-Na/PAM/PVA Solution Optimization for Enhancing Cotton Yarn Performance by Adhesive-aided Ring Spinning

“…The contact area length within the range from 2.97 mm to 1.22 mm can ensure the normal process of AARS spinning. In addition, the yarn moisture regains of ring spun yarn and adhesive-aided ring spun yarn are 8.3 % and 8.2 %, respectively [17]. The similar moisture regain means that the adhesive-aided ring spun yarns have the same dry condition with ring spun yarns.…”

“…In addition, the AARS is applicable in extensive range of yarn counts [16] and the twist stop effect caused by the adhesive and the contact is relatively small. However, such twist loss rate could not affect the spinning efficiency and lead to unstable spinning process through the observation of the AARS process [17].…”

“…Improving the fiber nature during the spinning process helps fibers easier to be spun. However, the adhesive-aided ring spinning (AARS) proposed by Gao [16,17] takes full advantage of the fiber nature rather than changing it and strengthen the gathering and twisting of fibers through additional system in the yarn formation zone.…”

“…The initiative rotation of cylinder brings the adhesive solution in the container on the fibrous strand and completes the wetting and adhesion between fibers and adhesive solution. Recent study [16,17] proves that the specific location of this system has no obvious significance on yarn performance. The contact area length within the range from 2.97 mm to 1.22 mm can ensure the normal process of AARS spinning.…”