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。     

摩擦纺纱工艺优化分析

本文以对摩擦纺纱质量影响较大的刺辊转速、尘笼内胆安装角和吸风负压等工艺参数作为三个因子,用通用旋转试验的方法对它们进行试验,推导出它们与各主要质量指标间的二次回归方程,作出各因子与质量指标间的等高线图,并用复合形法进行优化,求出理论工艺最佳点。试验得出,适当提高刺辊转速,有利于成纱质量的改善,但刺辊速度过高质量反而下降;吸风负压和尘笼内胆安装角对质量影响的交互作用明显,尘笼内胆安装角较小时,吸风负压的增长有利于质量改善,安装角较大时,吸风负压的增加不利于成纱质量。文章认为,适当的刺辊速度配以较小的尘笼内胆安装角和较大的吸风负压可以得到较好的工艺效果。     

建立赛络纺纱最优工艺参数的数学模型

采用二次通用旋转组合设计建立赛络纺纱线强力、毛羽、条干等指标的数学模型,并利用多目标函数优化求出其最优工艺参数。     

管道纺纱主要工艺参数的优化

管道纺纱是一种新研究出来的自由端纺纱方法,要能实际纺纱还必须合理地选择其工艺参数.本文分析了影响管道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,确定了相应的约束条件.并采用惩罚函数法进行优化计算,求得最佳工艺条件.再根据优化计算出来的工艺条件,在管道纺纱单头试验机上实际纺制28tex纯棉纱.不仅能稳定地纺纱,而且其纱强力与优化计算结果基本一致.     

细支纱摩擦纺初探——尘笼胆结构及其安装角α对纺纱的影响

本文以细支纱摩擦纺为研究对象,利用实验测试手段研究了尘笼胆结构对吸口轴向负压和尘笼胆安装角α对加捻区轴向负压和流速分布的影响。最后,基于类似于控制论中的“黑箱”原理,采用二次正交回归设计在实验室自制单头机上进行了32支纱的纺纱试验,建立了加捻辊加稔效率、纱线品质指标及CV值与尘笼胆几何尺寸、尘笼胆安装角α、摩擦辊转速及纺纱速度间的关系,并作了分析,由此得到选取α=0°、S=6毫米左右较好的结果。     

摩擦纺前纺工艺路线对成纱质量的影响

分析了两种不同工艺路线对摩擦纺成纱质量及物理机械性能的影响，找出了较为合理的工艺路线．为摩擦纺的扩大使用，进一步降低生产成本提供了有用依据     

摩擦纺纱中一种纤维分梳和输送装置的试验和分析

本文分析了目前粗支纱摩擦纺机和细支纱摩擦纺机的特点。作者设计了一种纤维分梳和输送形式。试验表明,该形式适纺支数范围较宽(148—18.5tex),能以1—2根条子喂入,纺制纯棉纱和各种纤维的混纺纱;可纺制内外层的纤维组分不一样的夹花纱;在安装附加装置后也可纺制包芯纱和花色纱。该装置机构简单,占地面积小,可供设计中、粗支纱摩擦纺纱机时参考。     

纺纱工艺对转杯纱质量影响的探讨

本文考察了转杯纺纱前不同的梳棉形式、分梳辊锯齿规格及其速度配置对转杯纺纱质量的影响,结果表明,上述诸因素均对成纱质量影响显著。并通过对比试验,表明,国产SAQ—5X及SAC—12锯条成纱的综合效果优于或接近HS6T原备件。     

CZ191型梳麻机预梳部分工艺研究

本文着重研究CZ191型梳麻机喂入预梳部分中,工艺参数改变时对生条质量的影响。采用了三因子二次通用旋转组合设计的试验方法,通过对生条中纤维平均长度、纤维长度不匀率、短纤维率、麻粒数、硬条数等指标的测量和分析,找出了喂入部分因子:喂入定量、分梳辊转速、分梳辊与喂麻针辊之间的隔距等对生条各指标的影响关系。在此基础上,采用多目标优化方法,找出了最佳的喂入部分的工艺参数。分析和讨论的结果表明,合理选择喂入预梳部分的工艺参数对提高梳理质量有重要意义。     

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。     

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.     

细丝开清工艺参数与工艺效果的试验

本文通过考查紬丝纺开清机械的若干工艺参数,对除杂效率和提高吹净绵的质量作了某些探讨,通过比较有系统的试验和数据分析,得出了较优的工艺参数,它对今后提高细丝质量具有一定的参考和使用价值。     

REPORT ON A PROJECT AIMED AT INCREASING THE STRENGTH OF FRICTION SPUN YARN BY USING A FALSE TWIST PROCESS

The lower strength of friction spun yarns has became a key problem that hinder the develop-ment of friction spinning,especially in high speeds and fine yarns.In this paper a project aimed atincreasing the strength of friction spun yarns by using a false twist process has been made.In re-ported experiment false twist was inserted into the yarn which has been formed on a friction spin-ning machine,so that it made the yarn untwist at first,then regain the twist.In the meantime draftwas applied to generate more tension than that which had been experienced during yarn formationon the friction spinning machine.It made the yarn reforming and the loosely bound fibres in thefriction spun yarn formed due to extremely low tension on the friction spinning machine becametighter.Results indicate that with the proper draft,tension and false twist the tenacity of processedyarn will increase more than 10%.This project is an attempt to discover whether improvements can be made and whether it isworth pursuing research into modifications of yarn structure.The results imply that if the yarntension can be raised during yarn formation on the friction spinning machine or a chance is offeredto the yarn to reform after the yarn formation the yarn tenacity will be increased obviously.     

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.