砂洗对丝织物结构的影响初探

本文从织物切片结构着手分析砂洗工艺对丝织物结构的影响,对织物经、纬向的屈曲波高及纱线的大小直径作了观察和测试,并采用 u 检验法进行了统计检验;同时通过电镜实验观察到砂洗后织物表面的微纤化结构。     

双纱纺成纱区几何状态和单纱捻度的试验研究

在双纱纺纱中,交汇区中的单纱捻度和交汇角对成纱的性能有很大影响,我们将相隔一定距离的两股黑白复丝从前罗拉后方喂入加捻卷绕机构来模拟双纱纺纱过程,并利用高速照相对纺纱过程中的纱线进行动态摄影,分析了一些主要纺纱工艺参数对纺纱过程和纺捻线性能的影响。     

AN INVESTIGATION OF THE RELATION BETWEEN COTTON FIBRE PROPERTIES AND YARN QUALITY BY USING HIGH VOLUME INSTRUMENT(HVI)SYSTEM

The objective of this paper is to establish reliable prediction equations relating cotton fibreproperties measured by HVI system and yarn quality,A useful statistical method is adopted for de-veloping a multiple regression model interpreting the relation between the data of Spinlab HVIfibre properties and quality parameters of yarn STQ (Strength Tex Quotient).The percent relativecontribution of a fibre property with respect of STQ is also assessed.The results show that the totalcontribution of the HVI measured fibre properties can account for 77.4% of known variation ofyarn STQ.The main feature of the approach is its flexibility in accommodating all fibre properties.The examination of regression equation showed that it could be well applied to predict STQ ofyarns spun from the same spinning system,but,for different spinning systems and also for yarns ofdifferent linear density,modification of the equation would be needed.     

四倍捻线的结构性能测试

介绍了多倍捻技术。对四倍捻纱线的结构性能进行了相应的测量分析，并与一般纱线进行了结构上的比较，找出了四倍捻纱线在结构性能上的优点和不足，作出了相应的评判。对四倍扮纱线性能进一步改善提出了方向．     

须条与长丝间距对Sirofil成纱结构性能的影响

分析了Sirofil纺纱过程中“V”形区的动态变化及粗纱须条与长丝间距大小对“V”形区形状和单纱受力的影响,认为间距增大会使“V”形区夹角增大、单纱段长度变长,并以此为依据,保持其他工艺参数不变,改变粗纱与长丝间距大小,试纺Sirofil纱,通过理论分析和实验比较讨论间距大小对Sirofil成纱结构性能的影响。结果表明：随着间距增大,成纱直径系数趋小、毛羽减少、强伸性与条干均呈非单调性变化;综合考虑成纱结构和性能,在其他参数相同时,Sirofil最佳成纱间距为12～16mm。     

Yarn Properties Prediction Based on Machine Learning Method

Although many works have been done to constructprediction models on yarn processing quality, the relationbetween spinning variables and yam properties has not beenestablished conclusively so far. Support vector machines(SVMs), based on statistical learning theory, are gainingapplications in the areas of machine learning and patternrecognition because of the high accuracy and goodgeneralization capability. This study briefly introduces theSVM regression algorithms, and presents the SVM basedsystem architecture for predicting yam properties. Model.selection which amounts to search in hyper-parameter spaceis performed for study of suitable parameters with grid-research method. Experimental results have been comparedwith those of artificial neural network(ANN) models. Theinvestigation indicates that in the small data sets and real-life production, SVM models are capable of remaining thestability of predictive accuracy, and more suitable for noisyand dynamic spinning process.     

The Yarn Curve and Tension in Rotor Spinning

The effective way of finding the yarn curve shape and tension of OE（open end） yarn inside the rotor is carried out and treated by dividing the yarn curve into two parts, from which the trajectory of the yarn sliding on the navel surface is also obtained. It is pointed out that the yarn curve shape and tension will both fluctuate with the trajectory＇s revolving cycle inside the rotor. However, the fluctuation is not too great, so the motion can still be regarded as approximately steady for dynamic analysis.     

绢丝/化纤长丝Sirofil复合纱扭转性能

在自制纱线扭矩-捻度装置（扭力秤法）上对绢丝／锦纶长丝、绢丝／涤纶长丝Sirofil复合纱的扭矩及其扭矩松弛行为进行测试分析，探讨其扭矩及其扭矩松弛率与复合纱纺纱捻度和纺纱间距间的关系，为这类仿丝型Sirofil复合纱的加工、应用提供实验依据和参考．     

Analysis and Discussion of Fiber Motion in the Spinning Triangle of Ring Spinning

In order to analyze the effect of the spinning triangle on yarn structure,a shape model of the spinning triangle is established.The fiber motion in the spinning triangle can be divided into three stages,and the relationship between yarn structure and fiber duration as well as the force acting on the fibers in the three stages is analyzed.The fiber elongation in different location of the spinning triangle is variational.The difference is that the elongation of fiber in the middle spinning triangle is bigger than that in the edge of it and the difference will be amplified with the increase of spinning triangle width,which has an effect on the characteristic of yarns structure.Research results for further study on compact yarn structure and improving spinning frame structure provide theorybasis.     

预型加工过程中玻璃纤维纱线损伤原因的试验分析

玻璃纤维纱线在预型加工过程中很容易受到损伤，发生毛丝、断头等问题，严重影响复合材料预型件的加工和性能。通过对玻璃纤维纱线的拉伸、弯曲拉伸以及摩擦性能的测试和比较，发现虽然玻璃纤维具有高模量、高强力等优点，但是其耐弯曲和耐摩擦性能很差：弯曲拉伸时强力下降了40％～60％，而摩擦情况下如果要使玻璃纤维纱线能承受上百次的摩擦，纱线所能承受的张力还不到其断裂强力的2％．因而，弯曲和摩擦是造成玻璃纤维纱线预型加工损伤的主要原因．