基于切断称重法的并条机牵伸区内变速点分布  

Distribution of variable speed points in the drafting zone of the drawing frame based on a cut-weighing method

作　　者：马文佳 刘新金 MA Wenjia;LIU Xinjin(College of Textile Science and Engineering,Jiangnan University,Wuxi 214122,China)

机构地区：[1]江南大学纺织科学与工程学院,江苏无锡214122

出　　处：《现代纺织技术》2024年第10期94-101,共8页Advanced Textile Technology

基　　金：国家自然科学基金项目(12272149、11802104);国家重点研发计划项目(2017YFB0309200);江苏省自然科学基金项目(20YSC002)。

摘　　要：为探究并条机牵伸区内纤维变速点分布的特点,以纺制定重为15.35 g/5m的普梳条和15.03 g/5m的精梳条为例,采用FA320A型高速并条机进行实验,对罗拉牵伸区中的须条进行定长的切断称重得到纤维质量分布,以其纤维质量变化率分布表征变速点分布,并在此基础上借助数据处理的方法分别给出定量表征牵伸区内纤维变速点分布稳定性、集中性、前移性的理论计算公式,并通过并条实验对所给出的公式进行了验证分析。结果表明:该理论计算公式可以判断出变速点分布的位置及状态;在此实验中,精梳条中的纤维在距前罗拉钳口线5~15 mm处变速相对集中且前移、稳定性好;普梳条中的纤维变速点分布较为分散,且远离前罗拉钳口线。该研究为变速点分布理论的发展提供了参考,有助于预测成条质量,提高并条效率。Drafting is one of the four major mechanical effects in the spinning process and the quality of the drafting effect directly affects yarn quality.During the roller drafting process the fibers in the sliver slip with each other at accelerated points so the distribution if fiber accelerated points has the most significant influence on the yarn quality.So far plenty of literature has analyzed the qualitative effects of fiber types drafting methods and drafting multiple on accelerated points but these studies are all under ideal assumptions and they have not yet given quantitative test of accelerated points distribution.Furthermore the unevenness of the yarn after drafting is not only influenced by the differences in accelerated points but also by the drafting multiple.Therefore the unevenness of the yarn after drafting does not directly reflect the stability of fiber movement.Therefore after analyzing the mechanism of roller drafting this study presented a new method to test the distribution of accelerated points in the roller drafting zone.The slivers were cut at equal lengths and weighed and then based on the weight change of the slivers in the drafting zone the distribution of the accelerated points was characterized.On the basis of the data obtained from the test the theoretical formulae characterizing the stability concentration and forward movement of the fiber accelerated points distributions in the drafting zone were derived with the assistance of data processing methods.Under the condition of keeping the process parameters constant experiments were conducted by using combed and carded slivers as raw materials for blending.Validation analysis was performed on the provided formulas revealing that the distribution of accelerated points in combed slivers is more concentrated stable and forward-moving.Consequently the quality of the resulting yarn is superior.The more dispersed the accelerated points are in carded slivers particularly those away from the front nip the higher their range coefficient will be leadi

关 键 词：并条 变速点 牵伸区 等长切断称重法 质量分布 

分 类 号：TS131.9[轻工技术与工程—纺织材料与纺织品设计]