摩擦—喷气复合纺纱主要工艺参数的优化

分析了影响摩擦—喷气复合纺纱的主要工艺参数。采用二次旋转组合设计方法,通过实验建立了主要工艺参数与成纱强力的数学模型。并采用惩罚函数法进行优化计算,求得最佳工艺条件,根据优化工艺条件,在摩擦—喷气复合纺纱试验机上实际纺制32tex纯棉纱,纱的实测强力与理论结果基本一致,达到同类环锭纱的80％以上。     

管道纺纱装置结构的优化

本文对管道纺纱装置的结构进行了深入的研究,提出了在原管道纺纱装置的基础上,将吸风装置绕输纤管道的轴线旋转180°的新方案。以这个设计方案为基础,对其主要的结构参数和主要的工艺参数进行了优化,求得了最佳结构参数和最佳工艺参数。再根据最佳结构参数制造有关零件,装在管道纺纱单头试验机上,以求得的最佳工艺参数为工艺务件,实际纺制28tex 纯棉纱。这个新装置不仅能稳定地纺纱,而且其成纱的缕纱强力与优化计算的结果基本一致。     

管道纺成纱结构的研究

本文对管道纺纱的加捻过程作了分析,得出成纱的外层纤维捻度较大和内层纤维捻度较小的结论。然后,通过受力分析,从理论上加以证实,并采用电子显微镜等实验手段,对管道纺和摩擦纺两种成纱实物的外部结构和内部结构作了同样的观察和计算,从实验方面也证实了管道纺成纱结构是内松外紧,与摩擦纺成纱结构内紧外松正好相反,有利于提高成纱强力。     

圆盘式旋流纺纱的工艺分析

介绍了圆盘式旋流纺纱的装置和流程，探讨了影响圆盘式旋流纺纱成纱性能的主要工艺参数，成功地纺制了包芯纱．为了解和掌握圆盘式旋流纺纱设备的纺纱性能、工艺特点，对所纺纱线的强度和耐磨性进行了测试．根据测试结果，分析了圆盘式旋流纺纱的主要工艺参数与成纱性能之间的关系，发现第一喷嘴压力、第二喷嘴压力、梳辊转速、喂棉量、棉条号数、喂入张力、芯纱退绕张力是圆盘式旋流纺纱的主要工艺参数．     

喷气纺纱工艺参数的优化选择

从优化喷气纱性能入手，通过确定目标值域，对喷气纺纱的主要工艺参数进行了试纺优选，找出了达到目标值域的优选参数。对于实际生产，有一定指导意义。     

中细支摩擦纺纱分梳工艺参数对成纱质量的影响

本文首先通过定量分析,对摩擦纺纱分梳质量及其主要影响因素进行了讨论。在此基础上,采用二次通用旋转组合设计的试验设计方法,建立了主要的分梳工艺参数与中细支摩擦纺成纱质量的回归方程。分析和讨论的结果表明,分梳刺辊转速与纺纱号数的合理选配对保证纺纱品质指标、降低成纱不匀率和粗细节有着重要的意义。     

棉/涤纶长丝Sirofil复合纱成纱工艺性能研究

以低弹涤纶长丝和精梳纯棉粗纱为原料,纺制不同捻度、不同喂入间距、不同长丝预张力的Sirofil复合纱,并测试了纱线的强力、条干和毛羽.通过正交试验分析方法,得到实验范围内棉/涤纶长丝Sirofil复合纱的优化纺纱工艺参数为捻系数321,长丝须条间距6mm,长丝张力片重量3g.     

Richcel纤维转杯纱的工艺特征及纺纱性能分析

介绍Richcel纤维的基本技术性能,对Richcel纤维转杯纺纱工艺特征和纺纱性能进行了分析,并通过Richcel纤维与棉混纺,确立了Richcel纤维与棉纤维混纺转杯纱的工艺流程和主要工艺参数,使设计的Rich-cel纤维转杯纱达到了较理想的质量要求.为规模生产Richcel纤维转杯纱积累了经验.     

麻类纤维喷气纺纱初探

本文对喷气纺纱在麻类纤维纺纱中应用的可能性进行了初步探讨。通过合理设计加捻器和工艺参数,采用喷气纺纱方法纺制含麻纤维纱线是可行的。作者用自行设计的两种型号的喷嘴成功地纺制了一系列含麻纤维喷气纱。文章对试纺情况进行了详细分析。     

喷气纺纱条动态气圈的转速与成纱强力的关系

喷气纺纱是利用旋转气流作用推动纱条形成气圈运动,使头端自由纤维加捻成纱。本文采用本组研制的纱条气圈转速仪对喷气纺纱纱条动态气圈的转速进行了测试,并就改变加捻成纱过程中的第一喷嘴和第二喷嘴的气圈转速,探讨其与成纱强力的关系。     

EFFECT OF OPENING OPERATING PARAMETERS ON YARN QUALITY IN FINE AND MEDIUM COUNT FRICTION SPINNING

In this paper, a quantitative analysis of the opening quality in friction spinning and its main ef-fecting factors is first made. Upon this basis the Box-Hunter's experimental design method is usedto establish the quadratic regressional equations in terms of primary opening technologicalparameters and yarn quality for medium and fine count friction spinning. The results of analysisand discussion show that the proper choice of opening roller speed and its reasonable match withthe yarn count is singificant for ensuring the spinning quality index as well as reducing unevenness,thin and thick places of the yarn.     

转杯纺27.8tex Tencel针织纱工艺探讨

Tencel是一种全新的纤维素纤维．转杯纺Tencel针织纱条干好、棉结和粗、细结少，有利于突出其针织产品的风格特征．分析了在转杯纺设备上纺制27．8tex Tencel针织纱的工艺要点及降低断头率的措施．给出了各工序的主要纺纱工艺参数．并与环锭纺27．8tex Tencel针织纱作了质量对比，结果表明：除了强力稍低外，其它质量指标均较相同号数的环锭纱好。     

静电纺纱加捻效率的初步研究

本文对静电纺纱的加捻机理和加捻效率进行了分析。通过实验测得了加捻管的机械加捻撩效率,从而得出了影响纱线捻度和加捻效率的主要因素。并采用二次回归通用旋转组合设计方法建立成纱捻度与加捻效率的回归方程。通过理论分析和实验结果所得结论是:在自由端须条上的假捻是影响加捻效率的主要因素,而机械滑溜相对来说比较小。影响纱线捻度和加捻效率的主要工艺参数是加捻管的转速和引纱速度。这两速度越高,总的加捻效率越低。     

THE INFLUENCE OF COMBING ROLLER SPEED ON PURE RAMIE NOIL ROTOR YARN QUALITY AND SPINNING PERFORMANCE

This paper reports the optimum design of combing roller speed with reference to yielding 6-13 Ne(98.4—45.4 tex) pure ramie noil rotor-spun yarns. The universal rotatable composite design is adopted to get the highly precise regression equations, in which the variables are combing roller speed and yarn linear density considered to be the main technological parameters of combing roller and, the responses are the evaluation indexes concerning spinning stability, fiber length distribution of fibre ring from rotor groove and yarn properties. Based on these regression equations, the contours are plotted to analyse the influences of the parameters on the evaluation indexes; the optimization multicriteria mathematical model is simultaneously established to obtain the optimum parameters with the aid of Object Programming Approach along with Constrained Random Ray Method. Finally, an experiment is carried out to further test the acceptance of the calculated optimum values. It is shown that, for any yarn linear density within 6—13 Ne (98.4—45.4 tex), combing roller speed varying from 5000 to 9150 r/min affects content of extra-long fibre in fibre ring from rotor groove and yarn properties but does not significantly influence spinning stability; 7075 r/min, at which the SAQ-12 type of saw-toothed combing roller runs, is recommended to be the optimum combing roller speed for producing 6—13 Ne (98.4—45.4 tex) pure ramie noil yarns, where a compromise is achieved among the lowest content of extra-long fibre in fibre ring, the best spinning stability and the best yarn properties.     

TENSILE BEHAVIOUR OF ROTOR SPUN YARNS

This paper deals with the tensile behaviour of rotor spun yarns. Having regard to the spe-cial construction of rotor spun yarn, some modifications for Hearle's theory have been made inorder to apply Hearle' s theory to rotor spun yarn. The paper then goes into calculating thetensile curve and investigating the effect of main parameters and spinning conditions on thetensile behaviour of rotor spun yarn. It was found that the following facts are noteworthy forimproving the mechanical properties of rotor spun yarn: (1) Selecting suitable navel so as tocontrol the P. T. E. length within a reasonable range. (2) Improving the design of single fibresupply device to decrease the amount of spoiled fibre and hence increase the effective fibrelength. (3) Increasing spinning yarn tension without yarn break to enhance the fibre migrationratio. (4) For the rotor spun yarn of industrial use, it is the way to increase the yarn strengththat the rotor groove should be designed with the groove angle beneficial to decrease the yarnspecific volume.