假捻装置对低捻赛络纺成纱质量的影响

介绍了运用假捻方法设计的低捻赛络纺纱装置,该装置加装在环锭细纱机前罗拉与导纱钩之间,通过假捻实现对加捻三角区的强捻;通过纱线性能的对比分析,对假捻装置的关键工艺参数即假捻器转速和其距机身的距离进行了正交试验与分析,得到假捻装置在低捻赛络纺纱中的合理工艺参数;指出,当假捻器转速为350r/min、距机身的距离为5cm时,成纱品质较为理想。     

假捻集聚纺假捻器位置及结构参数的优化

为对假捻集聚纺假捻器的作用有更深刻的认识,采用响应曲面方法分析假捻器的位置及结构参数对成纱性能的影响,并采用满意度函数方法对上述参数进行多响应优化.结果表明:纱线的条干CV值主要受假捻腔最小曲率半径的影响;假捻器转速比和假捻腔的最小曲率半径对纱线毛羽指数的影响作用比较明显;实验研究的3个参数对纱线断裂强度和断裂伸长率都...     

16.7 tex纯苎麻纱线赛络假捻纺工艺研究

苎麻纤维粗硬,弹性回复性差,成纱毛羽多,且残余扭矩大,织物表面纬斜严重。为改善纱线质量,降低细纱的残余扭矩,采用赛络低扭纺纱技术试纺了16．7tex纯苎麻细纱,探究了喇叭口位置、假捻器高度、假捻器与前罗拉的速比、钢丝圈规格对成纱质量的影响．并对细纱的断头率、断裂强力、毛羽指数、条干均匀度几个指标进行了测定和对比。得出纺16．7tex纯苎麻赛络低扭纱的最优工艺参数为喇叭口位置左移0．5cm、假捻器高度为1cm、假捻器与前罗拉的速比为2．5、钢丝圈规格为G2。     

假捻装置对成纱性能与结构的影响

分析假捻装置对纱线结构和性能的作用效果。通过在DTM 129型细纱机的前罗拉与导纱钩之间加装假捻装置,纺制改装前后两种方式的纱线,并对成纱指标进行测试分析;在显微镜下对纱线横截面和纵向表面进行观察分析,并对纱线直径和捻回角进行统计计算。结果表明:假捻纺纱线的强伸性、毛羽和条干等性能均优于普通纺纱线;假捻纺纱线结构紧密,直径略有减小,捻回角相对偏小,受外界挤压变形小。通过研究该纺纱方法可以更好地对纱线质量进行预测和控制。     

假捻集聚纺纱方法中基本工艺参数的作用分析

为提高棉纺环锭细纱的成纱质量,提出并介绍了假捻集聚纺纱方法.通过纺纱实验研究采用这种纺纱方法时假捻器转速比、转向以及牵伸形式对纱线条干CV值、毛羽指数、断裂强度和断裂伸长率的影响.结果表明:皮圈牵伸系统所纺纱线质量要好于简单罗拉牵伸系统;假捻器的转向要根据粗纱的捻向而定,如果粗纱为Z捻,则假捻器应为逆时针转动;假捻器转...     

假捻器在环锭纺上的应用

为了解决传统环锭单纱残余扭矩的问题,提出在现有环锭细纱机导纱钩与前罗拉之间加装新型假捻器的设想,设计的假捻纺纱技术既能提高环锭纺的产能,又能减少断头;改进后的环锭纺纱机可纺出低捻、高强、残余扭矩小、手感独特(柔、顺)、织物歪斜小等特性的新型纱线;说明该假捻纺纱技术改变了传统的纺纱成纱形式,在技术改造、纱线成纱指标、后期...     

假捻集聚纺纱线的特征分析

探讨假捻集聚纺纱线的性能特点.测试了不同捻系数假捻集聚纱线的各项主要性能,并与同捻度的传统环锭纱线进行了对比试验分析.结果表明:捻系数为280的假捻集聚纱线.其条干CV值均比同捻系数的传统环锭纱差,而纱线的毛羽指数、断裂强度和断裂伸长率也只有在假捻器转速比适当的条伴下才好于传统环锭纱.而当捻系数为360时,假捻集聚纱线的条干CV值和断裂强度只有在假捻器转速比较低时才好于传统环锭纱,而毛羽指数和断裂伸长率则可在较大的假捻器转速比范围内优于环锭纱.     

四种超柔面料用纱的纺纱工艺改进方法

为研究柔软面料用纱纺纱工艺改进方法,生产了转杯纺超低捻纱、低捻度竹节纱、低扭矩超低捻纱及超低捻包缠纱等品种,针对不同的纱线类型,分别分析其纺纱工艺影响因素,提出改进方案并进行验证。对影响转杯纺超低捻纱的纺纱稳定性、纱线蓬松度及成纱指标等工艺参数进行了优选,采用K8R型号阻捻头、TT346型号纺杯、黑色型号阻捻装置生产超低捻纱,生产效率提高了31%~84%。通过研究竹节纱捻系数与强力的关系,认为节距捻系数决定纱线强力,并制定超低捻竹节纱节距捻系数取值范围,调整后设计捻系数较正常竹节纱平均降低60~90。对低扭矩超低捻纱关键工艺参数捻系数、喇叭口间距、钢丝圈质量及假捻元件线速度与前罗拉线速度比值进行了试验,研究发现不同配棉对织物风格影响很大。通过生产超低捻耐磨纱,改进了包缠纱长丝的参数,如长丝喂入位置、长丝退绕张力、长丝牵伸倍数、长丝装置等,改善纱线性能,提高其柔软性。通过对纺纱工艺的改进,4种低捻纱的生产效率和产品质量有了很大提高。超低捻纱线质量的改进有助于后道工序质量和织物风格的提升。     

假捻法赛络纺超柔软针织用纱的研究

介绍了一种新型针织用纱——假捻法赛络纺超柔软针织用纱,它通过在赛络纺细纱机的前罗拉和导纱钩之间安装一个专门设计的假捻器纺制而成。对这种新型针织用纱及其织物进行了测试与分析,并与赛络纺纱及其织物作比较。实验结果表明,假捻法赛络纺超柔针织用纱及其织物的性能较好。     

环锭纺纱机假捻器装置的构造

环锭纺纱机历经数百年的发展,如今面对多变的纤维原料和不断提高的纱线质量要求,诸多技术问题相继显现。具体分析了这些技术问题产生的原因:在纺纱过程中存在三维加捻三角区、高纺纱张力及张力波动的缺陷。介绍了假捻器装置的构造、原理及试纺效果。试纺结果表明,该装置有效降低了纺纱张力,提高了成纱的断裂强力,成纱的断裂伸长率、粗节、细节、毛粒及捻度变异系数等指标均优于传统环锭纺纱线。     

凹槽形状对气流槽聚纺纱集聚区流场及成纱性能的影响

针对气流槽聚纺纱不同集聚凹槽形状对成纱性能的影响,建立集聚区域三维模型,利用Fluent软件模拟不同凹槽结构的气流槽聚装置集聚区域的流场分布,比较其气流流场的特点。模拟结果表明：在相同负压条件下,非对称凹槽气流槽聚装置的气流利用率高,负压气流方向和集聚方向的速度分别为48.3、24.5 m/s,可有效握持和集聚纤维束,使得输出的须条能够最大程度地集聚,纤维也尽可能多地集中成为主体纤维束,有利于减少毛羽。通过测试所纺27.78 tex苎麻纱的成纱性能,验证非对称凹槽的集聚性能以及集聚气流对成纱性的影响。实验结果表明：采用非对称凹槽集聚装置纺制的纱线毛羽比环锭纺减少了77.58%,成纱强力比环锭纺提高了14.32%,成纱性能显著提高。     

Research on Sirospun yarn torque using airflow false twisting device

Yarn torque is one of the most important indexes of yarn quality, which is determined on the mechanical state of the constituent fibers and their configuration in the yarn. The fiber tension within a yarn was proposed to be the most influential factor governing the magnitude of yarn torque by Bennett and Postle. Therefore, the research on Sirospun yarn torque is investigated by analyzing the fiber tension at spinning triangle in this paper. Firstly, theoretical models of the fiber tension distributions at primary and final spinning triangles are presented, and corresponding residual torque within a yarn due to the fiber tension is given. The relationships between the yarn torque and the spinning triangle parameters are analyzed theoretically. Secondly, as an application of the proposed method, a modified Sirospun spinning system with an airflow false twisting device which can change spinning triangle parameters are investigated, and the properties of spun yarns produced by the modified system are evaluated and analyzed. It is shown that with the increasing airflow pressures, the Sirospun yarn shows a more and more uniform distribution of tensile and compressive stress within a yarn, and thus the yarn torque decreases correspondingly.     

Research on process parameters in a novel drafting system

To overcome the shortcomings existing in the roller drafting system of air jet spinning, a set of combing roller-drafting system has been introduced to substitute the roller drafting system in air jet spinning. Moreover, a funnel-shaped fibre conveyer, a disc fibre collector and a swirl twister have been designed to accomplish the spinning process, which was named disc swirl spinning. Experimental spinning proves that combing roller drafting device wears little. Its remarkable advantage lies in the high efficiency of drafting. The rotational speed of jet stream in nozzle can be well utilized, which promises a high productivity. The relationship between the drafting process parameters of disc swirl spinning and yarn properties, such as tenacity and peeling-off-resistance, has been investigated and the data suggest that yarn properties keep stable when combing roller speed is 6000–7000 rpm, feeding quantity is 1.695–2 g/min, sliver linear density is 2–2.58 g/m, feeding tension is 0.012 N and the unwinding tension of the core filaments is 0.06 N. Furthermore, the appearance of disc swirl spun yarn is compared with that of air jet spun yarn. The scanning electron microscope (SEM) photos show that yarn structure of disc swirl spun yarn is similar to that of air jet spun yarn. The core is bound by the outer fibres and it is nearly parallel and no twist. However, the outer fibres of disc swirl spun yarn cover yarn body totally, which is different with that of air jet spun yarn.     

圆盘式旋流纺纱方法

提出一种新型纺纱方法 ,即圆盘式旋流纺纱。介绍其工艺流程、机构设计 ,包括梳辊牵伸机构、斗式纤维传送机构、圆盘式纤维集聚机构及旋流加捻机构 ,并对该纺纱方法所纺纱线的性能进行了初步测试与分析。对比扫描电镜的照片 ,发现圆盘式旋流纱的外观形状与转杯纱线接近 ,内部成纱结构却与喷气纺纱相似 ,纱线呈包缠真捻。与环锭纱相比 ,圆盘式旋流纱断裂强力略小、断裂伸长不匀率较大 ,其余指标基本接近。     

网格圈负压式集聚纺集聚区须条半自由端加捻机制

网格圈负压式集聚纺纱实践表明,在相同工艺条件下,纺制相同线密度的纱线,集聚纱捻度比环锭纱捻度高5％左右.为揭示此现象的形成机制,采用高速摄影技术,对直线形集聚斜槽集聚区须条的集聚情况进行拍摄,发现存在类似卷捻的现象.通过纺纱实验,对采用相同工艺纺制的相同线密度的集聚纱和环锭纱捻度进行对比,结果表明集聚区须条的附加捻度是...     

Research on yarn qualities modified by mechanical false-twisting device

Abstract

In the ring-spinning process, the area between the front roller nip and twisting point is spinning triangle, and its geometry influences the fiber tension distribution in the spinning triangle directly and determines the properties of spun yarns. Therefore, in the paper, one kind of mechanical false-twisting device was introduced on the ring spinning, which can affect the twist propagation and change the spinning triangle geometry actively. First, the modification of the false-twisting device on the DTM129 ring-spinning frame was introduced. Taking the medium cotton yarn spinning as an example, corresponding ring yarn, Sirospun yarn, compact yarn were spun on the modified spinning frame under different designed twist factors, and the applicability of the false-twisting device on different spinning method was discussed. It is shown that comparing with the common yarn, the Hairiness and Strength of the modified yarns are all improved, and the effect of false-twisting device on yarn qualities is more effective for the low-twist yarn. Comparing with the ring spinning, the improvement degree of the modified compact spinning is a little smaller. Then, the long-staple cotton ring yarn, polyester and medium cotton blend ring yarn, polyester ring yarn were spun on the modified spinning frame under different designed twist factors, and the applicability of the false-twisting device on different fibers was discussed. It is shown that the influence of the false-twisting device on the long-staple cotton yarn and polyester yarn is little. That is, the false-twisting device given in the paper would be more applicable on the short fiber spinning under the low designed twist factor.     

喷气涡流纺工艺对粘胶/涤纶包芯纱性能的影响

为获得更高强力的喷气涡流纺纱线,通过引入涤纶长丝制备喷气涡流纺粘胶/涤纶包芯纱。采用统计分析等方法研究了芯丝线密度、纺纱速度对喷气涡流纺粘胶/涤纶包芯纱强伸性、条干不匀和毛羽的影响规律,同时对比分析了不同纺纱条件下包芯纱的结构外观。研究结果表明：芯丝线密度、纺纱速度对喷气涡流纺粘胶/涤纶包芯纱各性能响应值有不同程度的影响;纺纱速度过高或过低均不利于包芯纱成纱的强伸性提高和条干均匀性改善,纺纱速度的增加会使毛羽H值增大;在一定范围内,增加芯丝线密度有利于包芯纱强伸性的提高,随芯丝线密度的增加,包芯纱毛羽H值减小;此外,选用较大的芯丝线密度和较高的纺纱速度时,纺制的包芯纱芯丝外露现象越明显。     

空心锭包覆纺纱的芯纱残留捻回及其应用

为探讨空心锭包覆纺纱过程中外包缠纱对芯纱的假捻作用与应用,以黑、白两色涤纶长丝纱组成双芯纱,黑色涤纶长丝纱为外包缠纱,纺制了不同纺纱工艺的包覆纱,分析了芯纱残留捻回的捻向和捻度特征以及锭速、引纱速度、芯纱张力对芯纱残留捻度的影响;对利用芯纱残留捻度纺制段彩纱的原理与段彩特征进行了探讨,并给出了应用实例。结果表明:外包缠纱对芯纱缠绕的假捻作用,会使芯纱上形成残留捻向变化、捻度不等的捻回分布;残留捻回的捻度随锭速的增大、引纱速度的降低、芯纱张力的减小而增大;利用芯纱残留捻回的片段呈色效应,可用异色芯纱纺制具有段彩外观的“纱/纱”复合段彩纱,这种段彩纱具有区别于常规段彩纱的“闪色”特征。