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首页> 外文期刊>Vlakna a Textil >ANALYSIS OF FORMATION OF MASS IRREGULARITY IN DRAFTING DEVICE DURING YARN SPINNING FROM SLIVER
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ANALYSIS OF FORMATION OF MASS IRREGULARITY IN DRAFTING DEVICE DURING YARN SPINNING FROM SLIVER

机译：从长条纺纱中拖曳装置中质量不规则现象的形成分析

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摘要

This work deals with an analysis of formation of mass irregularity of fibrous product in a drafting arrangement of air-jet spinning machine. Sliver is supplied into the machine and attenuated in four-line double-apron drafting arrangements before formation into yarn. There, the total draft is realized within three zones: infeed draft, intermediate draft and main draft. In the work, the components of mass irregularity (limiting, systematic, additional and systematic developed from latent (immeasurable) irregularity), which form the structure of total mass irregularity of fiber strand in the output from the drafting unit, were defined. Transformation of mass irregularity of fibrous assembly by this drafting device was theoretically analyzed. The theoretical analysis of machine irregularity was realized too. Within the experiment, 100% Tencel yarns of count 23 tex were spun from the sliver of three various linear densities using the Rieter air-jet spinning machine J20. Three levels of intermediate draft ratio were also set. Proportionally to it, the level of main draft ratio was changed, while the both infeed draft ratio and other spinning parameters were kept constant. Sliver and yarn mass irregularity as well as number of yarn faults were measured and analyzed, machine irregularity was calculated. The results showed that the lowest value of yarn mass irregularity is achieved when the sliver with higher linear density in combination with the lowest level of intermediate draft ratio (both from the observed range) is used for air-jet yarn production. It confirmed the theoretical analysis that draft ratios in infeed and intermediate drafting zone has more significant importance for air-jet yarn mass irregularity compared to the level of main draft ratio. Sliver mass irregularity is also very important factor for total yarn mass irregularity. Similar results were also recorded for number of yarn faults (especially for thin places (-40%)).
机译：这项工作分析了在喷气纺纱机的牵伸装置中纤维产品的质量不规则性的形成。将棉条供应到机器中，并在形成单纱之前以四线双皮圈牵伸装置进行衰减。在那里，总吃水在三个区域内实现：进给吃水，中间吃水和主吃水。在工作中，定义了质量不规则的组成部分（限制性，系统性，附加性和系统性，由潜在的（不可衡量的）不规则性发展而成），这些成分构成了牵伸装置输出中纤维束的总质量不规则性。理论上分析了该牵伸装置对纤维集合体质量不规则性的转化。也实现了对机器不规则性的理论分析。在实验中，使用立达喷气纺纱机J20从三种不同线性密度的条子上纺出了23 tex的100％Tencel纱线。还设定了三个水平的中间牵伸比。与之成正比的是，改变了主牵伸比的水平，同时使进给牵伸比和其他纺纱参数保持恒定。测量并分析条子和​​纱线质量不均匀性以及纱线疵点数，并计算出机器不规则性。结果表明，将具有较高线密度的棉条与最低中间牵伸比水平（均在观察范围内）结合使用来生产喷气纱时，纱线质量不均匀性最低。它证实了理论分析，与主牵伸比的水平相比，进给区和中间牵伸区的牵伸比对喷气纱线质量不规则性具有更大的重要性。棉条质量不规则也是造成总纱线质量不规则的重要因素。纱线断头的数量也记录了相似的结果（尤其是在薄地方（-40％））。

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