用喷气-环锭和喷气-络筒技术减少麻纱线毛羽的研究

喷气-环锭和喷气-络筒是一种简单、低成本的减少纱线毛羽的新方法.我们对其进行理论和实验研究.采用数值模拟的方法,对毛羽在喷嘴内的运动进行模拟,说明了利用喷嘴减少毛羽的机理.根据数值模拟的结果,我们预测了喷嘴参数对减少毛羽的影响,并以麻纱为对象,用实验的方法研究了喷气-环锭和喷气-络筒技术对减少纱线毛羽的效果以及参数影响,实验与理论研究的结果相符.     

利用喷嘴在络筒机上减少苎麻纱毛羽的研究

本文将喷嘴与络筒机相结合,对喷嘴减少苎麻纱的毛羽进行了实验研究,并研究了参数对减少毛羽的影响,实验结果表明了喷嘴中高速旋转气流对减少苎麻纱毛羽的有效性.     

苎麻／壳聚糖抗菌纱喷气纺研究

对苎麻/壳聚糖(55/45)抗菌纱,采用喷气纺纺制的可行性进行了探讨,结果表明:通过对喷嘴的设计,选取优化后的工艺参数,同时,喷气纱具有较佳的纱线结构及良好的抗菌性。     

DF-2型水草卷绕机的研制与使用

介绍了ＤＦ－2型水草卷绕机的设计重点,及其主要结构、工作原理、保养要求和使用效果。     

亚麻／大豆蛋白纤维转杯纺纱产品的开发与研制

介绍了亚麻和大豆蛋白纤维的性能，结合生产实践，通过工艺试验，探讨了亚麻／大豆蛋白纤维转杯纱的一些工艺参数，为提高成纱质量提供参考依据。     

混纺比对麻涤纱线性能的影响

本文通过对不同混纺比下的麻涤混纺纱的性能测试分析得出：涤纶比例必须达到一定量（40％）后，混纺纱的断裂伸长率才能随着涤纶比列的提高而逐渐改善；随着混纺比的改变，在涤纶含量为50％左右，混纺纱的断裂强力将出现一个低谷；随着涤纶含量的增加，毛羽和条干指标得以改善。     

Yarn setting and hairiness reduction with a steam jet during winding

This paper examines the use of pressurized steam for wrapping and setting the yarn hairs concurrently via a new steam-jet process during winding. Yarn torque can also be stabilized as an added advantage. The results obtained with two batches of pure wool yarns suggest that there is potential to achieve yarn hairiness reduction of up to 60 % with minimum deterioration in hairiness even after subsequent rewinding.     

Examining the effects of balloon control ring on ring spinning

The ring spinning process has been used to produce fine and high quality staple fibre yarns. The stability of the rotating yarn loop (i.e. balloon) between the yarn-guide and the traveller-ring is crucial to the success and economics of this process. Balloon control rings are used to contain the yarn-loop, by reducing the yarn tension and decreasing the balloon flutter instability. Flutter instability here refers to the uncontrolled changes in a ballooning yarn under dynamic forces, including the air drag. Due to the significant variation in the length and radius of the balloon during the bobbin filling process, the optimal location for the balloon control ring is not easily determined. In order to address this difficulty, this study investigates the variation in the radius of a free balloon and examines the effect of balloon control rings of various diameters at different locations on yarn tension and balloon flutter stability. The results indicate that the maximum radius of a free balloon and its corresponding position depend not only on the yarn-length to balloon-height ratio, but also on yarn type and count. A control ring of suitable radius and position can significantly reduce yarn tension and decrease flutter instability of free single-loop balloons. While the balloon control rings are usually fixed to, and move in sinc with, the ring frame, results reported in this study suggest that theoretically, a balloon control ring that always remains approximately half way between the yarn-guide and the ring rail during spinning can lead to significant reduction in yarn tension.     

基于茎材解剖结构的茶树树龄测定方法

以茶树为研究对象,采用茶树茎材切片及染色技术,在生物数码显微镜的普通光和荧光下,对未处理的茶树茎材切片、番红染色茶树茎材切片及吖啶橙染色茶树茎材切片进行比较与分析。结果表明,茶树茎材切片使用吖啶橙染色后在普通光和荧光下确定树龄的效果较好。这种基于数字图像确定茶树树龄的吖啶橙染色法,具有快速、准确、简单和成本低等特点,对大茶树和古茶树活体生长锥取样年轮条的年轮识别具有科学参考意义。     

茶树短穗扦插不同品种与密度的效果比较

扦插密度对茶苗的生产效果有较大影响。本文依据茶苗的成活率、成活数、出圃率和出圃数4方面对茶树不同品种的扦插密度的效果进行了探讨,提出了按照茶苗出圃数的指标确定各品种的最适扦插密度。