Abstract: Sizing is a crucial process in weaving production, and its quality directly impacts the production efficiency of weaving machines and the quality of the fabric. The technology of sizing machines has a significant influence on the sizing effect. Among them, regulating the sizing machine speed and squeezing force is the top priority of the sizing process. During operation, the speed of the sizing machine is in a constantly changing state due to the requirements of start-up, stopping, fault treatment, and moisture regain control. Changes in the speed of the sizing machine directly affect the adsorption and squeezing of size liquor when the yarn passes through the size box, causing fluctuations in the sizing rate. Therefore, modern sizing machines are equipped with speed-force matching control technology, which can adjust squeezing force when the speed changes, thereby achieving stable sizing rates and the same sizing effect. At present, the schemes used in the matching control technology of sizing machine speed and squeezing force are all linear. Due to the lack of theoretical basis for this linear relationship and the reliance on manual experience in calibrating the linear model, there are certain errors in the actual control of sizing rates.
To better control the sizing rate by controlling the squeezing force when the speed of the sizing machine changes, we simplified the warp sizing process into the yarn immersion and squeezing process by making rational assumptions about the sizing problem. Firstly, in the analytical discussion of the immersion process, a functional relationship between immersion time and the space in which the yarn has absorbed the size liquor was established. Then, through the in-depth investigation of the mechanism of the squeezing process, the functional relationship between the amount of sizing liquid squeezed and the speed of the sizing machine and the squeezing force was constructed. A model of the relationship between sizing machine speed and squeezing force on sizing rates was constructed according to the aforementioned process. Six levels were set for sizing machine speed and squeezing force respectively, comprehensive experiments were carried out on all combinations of each level of these two parameters, and a total of 36 data were obtained for fitting the constructed model. The R2 value of the goodness of fit reaches 0.8754, which verifies that the model proposed in this paper elucidates the mechanism of the influence of sizing machine speed and squeezing force on sizing rates to a certain extent.
To check the application effect of the model from the practical perspective, the sizing rates of 8%, 9%, 10%, 11%, and 12% were taken as the target sizing rates, and based on the model constructed in this paper, the values of squeezing force were deduced and calculated under the sizing machine speeds of 10, 20, 30, 40, and 50 m/min, and the values were calculated based on the model constructed in this paper. And the sizing experiments were carried out under the corresponding processes. The results show that when the scheme modeled in this paper is used, the average relative error of the measured sizing rate is 2.59%. The average relative error of the measured sizing rate is 16.31% when the linear scheme is used for sizing under the same conditions. It shows that the model scheme constructed in this paper is significantly better than the linear model scheme in controlling the sizing rate. It is beneficial to realize the stable regulation of sizing rates under different vehicle speeds, and can meet the stability requirements of sizing production. It has good industrial application value.

Key words: sizing machine speed, squeezing force, sizing rate, model building, sizing process

摘要： 现代浆纱机配备了浆纱车速-压浆力匹配调控技术，以稳定控制上浆率；目前普遍采用车速-压浆力线性调节方案，但缺乏一定的理论指导，往往会造成上浆率稳定性控制的效果不理想。为提高上浆率控制稳定性，对车速与压浆力对上浆率的影响关系进行研究。通过对浆纱过程中浆液的浸透与压出进行合理化假设，构建了车速、压浆力和上浆率的关系模型。基于该模型，提出不同车速下压浆力的求解方法，用于实现上浆率的稳定控制。该模型在浆纱实验数据中的拟合优度R2达0.8754，较线性模型高0.1388，验证了模型构建的合理性。依据该模型构建上浆率稳定控制方法，在不同车速下对压浆力进行调控实验，实测上浆率与设定值的平均相对误差为2.59%，有效实现了不同车速下的上浆率稳定控制。构建的车速、压浆力、上浆率关系模型，对解释车速与压浆力影响上浆率的机理具有一定的理论意义；基于该模型构建的上浆率稳定控制方法，为提高浆纱上浆率稳定控制水平提供了新的途径。

关键词: 浆纱车速, 压浆力, 上浆率, 模型构建, 浆纱工艺