Studies on cotton–acrylic bulked yarns and fabrics. Part I: Yarn characteristics

The effect of variables, namely yarn fineness, shrinkable acrylic proportion and twist level, on various properties of cotton–acrylic blended bulked yarns has been studied by relaxing shrinkable component of the yarns using boiling water treatment. A three-variable factorial design technique proposed by Box and Behnken was used to investigate the combined interaction effect of the above variables on the properties of these yarns. The design variables were optimized for all the yarn properties by using the response surface equations. The shrinkage percentage of yarn was found to be higher in the case of coarser yarn, yarn with higher proportion of acrylic fibre and higher twist level. During bulking treatment as the yarns shrink, the effective number of twist per unit length also increases significantly. It is observed that the specific volume of the yarn increases with an increase in the acrylic proportion and decreases with an increase in the twist factor. The breaking extension increases significantly after bulking with a slight increase in tenacity. The flexural rigidity and initial modulus of yarn considerably decrease on bulking. The vertical wicking heights for all the bulked yarns were found to be higher than comparable 100% cotton yarn.     

再生纤维素(竹)-棉喷气纱的性能

研究了再生纤维素(竹)-棉喷气纱的特性与第一个喷嘴位置的关系。增加第一个喷嘴压力及其到前罗拉钳口的距离能增大强度、断裂伸长、弯曲刚度和不匀率,且减少纱线毛羽。而第一个喷嘴的压力是影响纱线特性的主要因素。     

精梳棉/粘胶/毛三组分MVS涡流纱的性能研究

文章主要从纱线的断裂强度、断裂伸长率、条干不匀、毛羽、耐磨等性能指标进行了分析研究,并与其他纱线尤其是环锭纱进行对比,得出除了纱线强力稍低于环锭纺以外,其它性能皆优于环锭纱的结论,显示出了涡流纱的优越性。     

环锭纺和紧密纺纱线的比较研究

比较研究了以棉、聚酯纤维为原料、在不同的紧密纺系统上纺制的相应的 环锭纺和紧密纺纱线.结果表明紧密纺纱线与环锭纺纱线相比,弹性、拉伸性、耐磨性、刚度和紧密度较高,毛羽、条干不匀率和疵点较少,纱线直径较小.而且,紧密纺的弹性恢复参数比环锭纺要好得多.从改变比例的方面来说,RoCoS系统纺出来的纱线与Zinser和Suessen紧密纺系统纺出来的纱线相比较时,表现出弹性、直径和紧密度的改变量小,但是拉伸性变化大.     

环锭旋流喷嘴纺麻混纺纱的性能

为改善麻纤维因自身性能缺陷与传统纺织工艺局限性所导致的成纱毛羽问题,将旋流喷嘴纺纱技术应用于精细化亚麻/长绒棉/天丝和大麻/棉/粘胶2种混纺纱的纺制,选择适当的细纱工艺参数并测试成纱后的主要性能指标。结果表明:当旋流喷嘴中通入的气流压强为0.1 MPa时,亚麻混纺纱的有害毛羽数量相对于传统环锭细纱降低了89.9%,压强为0.05 MPa时,大麻混纺纱的有害毛羽数量降低了99%;显微镜下2种混纺纱线的纱体结构紧密,纤维排列整齐,纱线表面光洁,大麻混纺纱中的黑色粘胶长丝均匀包裹在纱体表面,使得纱线色泽更为均匀;纱线断裂强力与条干不匀率稍有降低,但变化不明显。     

A study on the quality of kapok blended yarns through different processing methods

In this paper, 14 types of kapok blended yarns and four types of cotton yarns manufactured through different spinning technologies and processing methods were selected in order to explore the most efficient spinning technology for kapok fiber. Four yarn characteristics were measured: yarn fineness/unevenness, yarn defects, yarn hairiness, and breaking tenacity. According to Uster Statistics 2007, GB-T/398-2008, and FZ12001-1992 standards, the analytical results of the four characteristics showed that the quality of kapok blended yarns achieved a higher level with the improvement of spinning technology. The compact spinning and processing technology IV was a preferred way to spin high-quality kapok blended yarn, which lent support to widening the application of kapok fibers in various end-use products.     

Studies on cotton–acrylic bulked yarns produced from different spinning technologies. Part I: yarn characteristics

The effects of different factors, namely spinning technologies (ring, rotor and DREF-II, i.e. Group A yarns), position of shrinkable acrylic feed sliver in DREF-II friction spinning system (Group B yarns) and proportion of shrinkable acrylic core fibre in core-sheath type DREF-III friction spun yarns (Group C yarns) on various properties of cotton-acrylic–blended bulked yarns have been studied. The bulk in the yarns was developed by relaxing shrinkable acrylic component of the yarns using boiling water treatment. All the above factors have a significant impact on various properties of cotton–acrylic blended bulked yarns. For all the yarns, after boiling treatment, there is lengthwise shrinkage of yarns and the specific volume also increases. Tenacity and breaking elongation of all the yarns of Group A and Group B increase after hot water treatment, whereas in case of core-sheath type DREF-III yarns (Group C yarns) there is drop in tenacity and breaking elongation after similar treatment. In general, for all the yarns the flexural rigidity of the yarns reduces and compressibility and compressional recovery of increases after bulking treatment.     

集聚纱与非集聚纱的轴向应变及其对纱线拉伸性能的影响

通过试验重点研究了轴向应变对集聚纱拉伸性能的影响。拉伸性能主要涉及断裂强度、断裂伸长和断裂功。选择不同的应变速率和纱线夹持长度,对9.7 tex集聚纱和非集聚纱进行拉伸测试,然后根据Meredith试验过程绘制不同应变速率和夹持长度条件下各自的负荷-伸长曲线,同时测量各曲线三个区域的斜率。测试结果表明：两种9.7 tex的纱线（集聚纱和非集聚纱）随着应变速率的增加,断裂强度均增加,但当断裂伸长增加到一定程度,且在较高应变速率下,断裂强度有所下降;两种纱线随着夹持长度的增加,断裂强度和断裂伸长均降低;两种纱线的斜率随着应变速率的增加均增加,但随着夹持长度的增加而下降。试验还发现,非集聚纱的斜率变化较大,而集聚纱的斜率变化较小。     

竹炭改性涤纶纤维／棉混纺纱线力学性能研究

为了研究竹炭改性涤纶纤维／棉混纺纱中竹炭纤维含量与混纺纱力学性能的变化关系,对不同混纺比混纺纱线在YG061电子单纱强力仪上进行拉伸性能、应力松弛性能测试,并对测试结果进行了分析和比较。结果表明：竹炭改性涤纶纤维／棉混纺纱的断裂强力随着竹炭改性涤纶纤维含量的增加先有逐渐减小的趋势,然后增大。竹炭改性涤纶纤维／棉的混纺比小于临界混纺比时,混纺纱的断裂伸长率变化趋于平直;一旦超过临界混纺比,随着竹炭改性涤纶纤维含量的增加,断裂伸长率迅速增大。在实际应用中,混纺纱最低断裂强度对应的临界混纺比在设计中应尽量避免选用。随着竹炭改性涤纶纤维含量的增加,混纺纱的弹性越来越好。     

基于混纺纱强伸性能研究的耐高温抗荷服面料研制

芳纶是耐高温抗荷服面料的理想材料。通过对混纺纱断裂特性的分析,建立了间位芳纶/Technora混纺纱断裂强度、断裂伸长率与混纺比之间的理论关系;并运用所建立的关系,合理地设计混纺比,制作出更好地满足强伸性能要求的新型阻燃耐高温抗荷服面料。     

采用织物上拆解的纬纱评价无梭织造的性能

研究了不同工厂的高中低支纬纱的性能。研究了原纱和织物上拆解下来的高中低支纬纱的诸如断裂强力、强度、伸长和断裂功等性能。研究表明原纱的强度与纬纱的断裂有很大关系。原纱的强度随着纱支的增加而增加,断裂强力、伸长和断裂功随着纱支的增加而降低,而对于拆解纬纱特性和纬纱断头之间未发现这种趋势。     

Effect of structural parameters of injected slub yarn on its tensile properties and abrasion resistance

In injected slub yarn, tensile and abrasion resistance are particularly very important parameters affecting its process performance and end-use. In single base injected slub yarn structure, slubs are developed by injecting fibres from outer side of the yarn with the sequence of untwisting base yarn followed by re-twisting after injecting the fibres. The tensile properties and abrasion resistance of injected slub yarns depend on the slub parameters. The surface of the yarn, especially the slub part is very much susceptible to damage by abrasion during usage, due to lack of fibre migration between base yarn fibres and injected fibres. In this paper, an attempt has been made to see the impact of slub yarn configuration i.e. slub length, slub thickness and slub frequency on tensile and abrasion resistance of injected slub yarn. Empirical models have been developed to find the dependence of these properties on slub yarn configurations. Configuration of slubs in particular slub length and slub frequency were found to be very significant on yarn tenacity, elongation and abrasion damage in terms of tenacity loss, elongation loss and hairiness rise of injected slub yarn. However, the impact of slub thickness is relatively less on the aforesaid parameters.     

纺棉型混纺纱用胶辊的选型与维护

为了降低纺纱用胶辊成本,提高成纱质量,从四个方面阐述了纺棉粘、棉涤、棉莫代尔、涤粘等系列混纺纱,精梳、并条、粗纱、细纱工序胶辊的选型、硬度配置等使用情况,详细介绍了胶辊使用管理制度及在兼顾成纱质量的前提下如何控制胶辊使用成本;指出以胶辊的抗绕性、适纺性、一致性、耐磨性等方面进行慎重选型为前提,以精心制作和精细管理做保证,同时兼顾购置、使用、维护成本,才能稳定并提升纺纱质量,实现持久的经济效益。     

83.3 tex花式变支数纱的拉伸性能

采用瑞士AmslerTex公司生产的花式纱装置,通过改变工艺参数,例如锭子速度、钢丝圈质量和合股捻系数等,可以在环锭细纱机上生产不同性能的83.3 tex花式股线纱.这些性能包括纱线强度、断裂强力、断裂伸长率,以及断裂功等.其中,纱线的强度和断裂强力随着钢丝圈质量的增加而增大.断裂功最大值则出现在锭速较低和钢丝圈质量较小时,而选定的合股捻系数对纱线性能的影响并不显著.     

芳砜纶阻燃纱线设计

将芳砜纶纤维分别与高强涤纶纤维、阻燃粘胶纤维按照不同比例混纺,测试混纺纱的强伸性能、外观质量和阻燃性。结果表明:芳砜纶/高强涤纶混纺纱中芳砜纶强力的临界混纺比为92.3%。随着高强涤纶比例的增加,混纺纱的断裂强力增加,断裂伸长率降低,条干不匀率及毛羽指数减少,阻燃性能下降且出现熔融现象。芳砜纶/阻燃粘胶混纺纱中阻燃粘胶强力的临界混纺比为73.8%。随着阻燃粘胶比例的增加,混纺纱的断裂强力及断裂伸长率降低,条干和毛羽有所改善,阻燃性能下降。     

Effect of key process variables on mechanical properties of blended vortex spun yarns

A study of significant factors and their interaction during vortex yarn spinning has been carried out to achieve desired mechanical properties of the polyethylene terephthalate/cotton blended yarns which can offer process and performance advantages. The key significant factors, i.e. feed ratio, air pressure and spindle size were varied in a mixed-level factorial design. The mechanical properties (count lea strength product, tenacity and elongation at break) were studied and feed ratio was found to significantly affect the tenacity and elongation at break of spun yarns. A significant effect of these parameters was observed on the diameter and hairiness of the Muratec vortex spun yarn.     

芳砜纶/芳纶1313混纺纱性能研究

用芳砜纶与不同细度的国产芳纶1313纤维混纺开发消防服用机织面料用纱.实验结果表明:随着细度较小的芳纶1313纤维比例的增加,混纺纱条干CV值有一定的波动,成纱强度并没有随着芳纶1313纤维含量的增加而增高.混纺比例对成纱的断裂伸长影响不明显,芳砜纶/芳纶1313混纺纱的毛羽随着芳纶1313纤维含量的增加而增多.     

Investigating the effects of draw ratio,hot-pin temperature,and overfeeding on the color values of air-jet textured polyester yarns

In this study, influence of draw ratio, hot-pin temperature, and overfeeding on the color values of air-jet textured yarns, which were produced from polyester partially oriented yarn, was investigated. Two different air-jet textured yarns were produced by setting the value of only one variable to its minimum and maximum, while the reference values selected for the production of the reference yarn were used for the rest of the variables. Six different air-jet textured yarns, which were produced by varying draw ratio, hot-pin temperature, and overfeeding, and the reference air-jet textured yarn were dyed with the same dyeing procedure. Some physical properties such as linear density, tenacity, and breaking extension of the air-jet textured yarns were measured and images of the cross-section of the yarns were taken. The color coordinates of the dyed yarn samples were also measured. The color differences of six yarn samples compared to reference air-jet textured yarn were calculated. Changing draw ratio, hot-pin temperature, and overfeeding affected the color values of the air-jet textured yarns according to the results. It was found that, overfeeding is the parameter that affects the color values of the air-jet textured yarn most.     

Influence of process parameters on properties of open-end and core-sheath friction spun acrylic yarns

The present paper is concerned with the influence of opening roller speed, difference in drum speed and suction air pressure on properties of acrylic open-end and core-sheath friction spun yarns. The results show that opening roller speed and suction air pressure have significant influence on properties of open-end friction spun yarns. In the case of core-sheath yarns, suction air pressure has influence on yarn tenacity and hairiness. However, yarn unevenness and imperfection are not significantly influenced by experimental variables. The results also show that core-sheath friction spun yarns have significantly higher yarn tenacity, modulus and work of rupture and have a lower level of yarn unevenness, imperfections, hairiness, and breaking elongation than open-end friction spun yarns.     

毛纱上浆前预处理方式的研究

通过上浆实验和浆纱性能测试,研究4种预处理方式对浆纱性能的影响,浆纱性能的评定指标有毛羽指数、耐磨次数、断裂强力及断裂伸长率.实验结果表明:预处理方式对浆纱性能有较大的影响,其中热水预处理、醋酸预处理和双氧水预处理能够改善毛纱的表面性质和润湿性能,提高毛纱上浆效果,并且醋酸预处理过的毛纱浆纱质量明显提高;但蛋白酶预处理过的毛纱浆纱质量略有下降.