Weft-Insertion Speed of Polyester Textured Yarns in Air Jet Loom

Ryuji Shintani, A. Okajima
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引用次数: 4

Abstract

Saving of energy and expansion of versatility are very important technical subjects for air jet looms (AJL) using profile reeds with sub-nozzle systems. Optimum weft-insertion conditions must be determined for each kind of weft yarn on the basis of the relationship between the airflow in the weft passage and the weft flight behavior. The relationship between weft-insertion conditions and weftinsertion speed of polyester textured yarns was experimentally examined by measurement of the weft tension using a benchmark-testing machine.On the other hand, the weft-insertion speed in AJL was numerically calculated under the consideration that it is a function of the air velocity in the weft-yarn flight path. In the computations, the velocity distribution issued from a circular jet was applied to the equations of the weft motion in the air jet loom as the velocity distribution of the weft passage.From the results, the maximum weft tension increased linearly with an increase in the weftinsertion speed, and also the rate of increase in the weft tension was dependent on the yarn count. Furthermore, of all the weft-insertion conditions, which include the supply air pressure and air injection timing for the main nozzle and sub-nozzles, the main nozzle air pressure most strongly affected the weft-insertion speed. The computational results of weft-insertion speed were in good agreement with experiments using a 16.5 tex/96 f yarn, it was, therefore, confirmed that the present method of numerical computation for the motion of AJL weft-yarn was suitable.
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涤纶变形纱在喷气织机上的引纬速度
节约能源和扩大通用性是采用分喷嘴型筘形喷气织机的重要技术课题。根据引纬气流与纬纱飞行特性之间的关系,确定各种纬纱的最佳引纬条件。采用基准试验机对涤纶变形纱的引纬条件与引纬速度之间的关系进行了实验研究。另一方面,考虑引纬速度是纬纱飞行路径中气流速度的函数,对AJL引纬速度进行了数值计算。在计算中,将圆形射流的速度分布作为纬纱通道的速度分布,应用到喷气织机的纬纱运动方程中。结果表明,最大纬纱张力随纬纱速度的增加而线性增加,纬纱张力的增加速率与纱线支数有关。此外,在所有引纬条件中,包括主喷嘴和副喷嘴的供气压力和喷气时机,主喷嘴的空气压力对引纬速度的影响最大。以16.5 tex/96 f的纬纱为例,对引纬速度的计算结果与实验结果吻合较好,证实了本文方法对AJL纬纱运动的适用性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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