In order to develop high shape retention yarn and investigate the effects of spinning process and core yarn contents on the shape retention of yarn, in this paper, three kinds of yarns, JC/T400 18.5tex (55.6dtex) core-spun yarn, JC/T400 18.5tex (44.4dtex) core-spun yarn and JC18.5tex pure cotton yarn were spun by using the complete condensing Siro-spinning technology. The paper aims to discuss these issues.,In this paper, the core-spun yarns were spun by using the complete condensing spinning and Siro-spinning technology. Two key spinning processes, yarn twist factor and core yarn pre-draft ratio, were optimized by using the orthogonal test method first. Then, via the variable control method, the position of the core yarn, the position of the bell mouth and the center distance between two bell mouths were optimized, respectively, and corresponding optimal spinning process of the three yarns was determined. Finally, the yarns were spun under the optimal process, and the performance of the spun yarns was tested and compared.,Results show that the yarn twist factor affects yarn strength and hairiness, the position of bell mouth affects the evenness and hairiness of the yarn mainly, and the position of the core yarn affects the coverage and hairiness of the yarn. For the Z-twist spinning, the core yarn enters the front roller from the left side of two strands center, which is beneficial to improve the covering effect of core yarn, and reduce the pilling phenomenon of the yarn. The contents of core yarn affect indicators of the yarn shape retention, such as yarn strength, elastic recovery and abrasion resistance.,The shape retention of yarns affects the shape retention of fabrics, and the production of yarn with high shape retention is a key step in achieving shape retention of fabrics. At present, there are little studies on the shape retention of yarns, most researchers shave focused on shape retention of fabrics. Using the complete condensing Siro-spinning method to spin the core-spun yarn can improve the quality of the yarn. Compared with traditional ring-spinning yarns, the addition of the core yarn can improve the shape retention of the yarn.

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纺纱工艺和包芯纱含量对纱线保形率的影响

为开发高保形纱，研究纺纱工艺和包芯纱含量对纱线保形性的影响，本文以JC/T400 18.5tex（55.6dtex）包芯纱JC/T400 3种纱线为研究对象。 /T400 18.5tex（44.4dtex）包芯纱和JC18.5tex纯棉纱采用完全浓缩赛络纺技术纺制而成。本文旨在对这些问题进行探讨。,本文采用全集聚纺和赛络纺技术纺制包芯纱。首先采用正交试验法对纱线捻度和包芯纱预牵伸比这两个关键纺纱工艺进行了优化。然后通过变量控制方法，分别对芯纱位置、喇叭口位置和两喇叭口中心距进行优化，并确定了三种纱线的相应最佳纺纱工艺。最后将纱线在最佳工艺条件下进行纺纱,并对纺出的纱线进行性能测试和比较,结果表明纱线捻度因素影响纱线强力和毛羽,喇叭口位置影响纱线的条干和毛羽主要是芯纱的位置影响纱线的覆盖率和毛羽。Z捻纺，芯纱从两股线中心左侧进入前罗拉，有利于提高芯纱的包覆效果，减少纱线起毛起球现象。包芯纱含量影响纱线强力、弹性回复和耐磨性等纱线保形性指标。纱线的保形性影响织物的保形性，生产高保形性的纱线是实现织物保形的关键步骤。目前对纱线保形的研究较少，研究人员多集中于织物的保形。采用完全凝聚赛络纺法纺包芯纱，可提高纱线质量。与传统环锭纺纱相比，包芯纱的加入可以提高纱线的保形性。采用完全凝聚赛络纺法纺包芯纱，可提高纱线质量。与传统环锭纺纱相比，包芯纱的加入可以提高纱线的保形性。采用完全凝聚赛络纺法纺包芯纱，可提高纱线质量。与传统环锭纺纱相比，包芯纱的加入可以提高纱线的保形性。