转杯纺纱过程中断头的主要部位在成纱形成过程的一段，此段捻度小、强力低。如果为了扩大转杯纱的应用范围以及改善转杯纱的有关性能，纺制低捻度转杯纱，则断头率进一步提高，生头成功率进一步降低。这里研究在转杯纺加捻区中加装阻扭件后，讨论分析加捻区中纺纱张力的变化，进而构成阻扭件产生的阻扭矩以及形成阻扭件前后区域埝度分布的变化并建立捻度分布模型。理论分析结果表明，加装阻扭件后，成纱捻度不变，但提高了自由端成纱形成过程一段的捻度，这对降低断头率、提高生头成功率有利。

氨纶纤维是近年来快速发展的高弹性合成纤维，它的延伸和回复性能使服装更合体、更舒适。本文系统地介绍氨纶的结构、性能和生产发展状况；深入分析各类氨纶纱加工原理及其性能；阐述热定形加工的机理及工艺；讨论含氨纶纺织品的染整工艺和发展趋势。

A complete representation of the skin microclimate-fabric-environment includes the skin layer S, fabric F and outside environment E. Between the skin and fabric is the "clothing microclimate" M. Condensation occurred in the fabric inner surface depends upon the model perspiration escaped from the human body transfer through the clothing which determined by the properties of the fabrics. A new measuring apparatus, which conducted under computer control, described in this paper can be used to investigate whether condensation occurred on the fabrics. The measuring apparatus can be used to examine, record and display temperature and relative humidity simultaneously and permits rapid testing of small quantities of fabrics in a short amount of time. It is logical to use the apparatus described in this paper rather than the ASTM 96E-00 to investigate water vapor permeability of fabrics, especially condensation on the fabrics inner surface.