Fiber Length Distribution and the Roller Drafted Bundle Thickness
The dynamic characteristics of the roller drafting operation determine the quality of the yarn and the process efficiency thereafter.And the fiber length distribution is an important factor that acts on the draft dynamics.Introducing the fiber length distribution into the governing equations of the bundle flow system,we simulated the linear density of output bundle numerically,while the input bundle thickness was assumed to change in a step way.Results showed that the transient fluctuation in the output linear density had different dynamic behavior,which was influenced by the fiber length distribution and process condition.The linear density fluctuation paled off with time,if the draft gauge length was large or the draft ratio was small.Oppositely,a short gauge length or a high draft ratio brought out fluctuations that increased with time and then reached a limited value.The dynamic behavior transition of the output linear density occurred in the range of draft gauge length between 1.25 and 1.5 multitudes of the maximal fiber length,which was irrespective of the shape of fiber length distribution.Draft ratio also influenced the linear density of the output bundle.High draft ratio led to greater fluctuation.The length distributed bundle revealed better uniformity in the output linear density than the bundle with a uniform fiber length.
Fiber length distribution Linear density Fluctuation Gauge length Draft ratio Behavior transition Maximum fiber length
You Huh Jong Sung Kim
Faculty of Mechanical and Industrial System Eng.,Kyung Hee University,Yongin,449-701,Korea;Laborator Faculty of Mechanical and Industrial System Eng.,Kyung Hee University,Yongin,449-701,Korea
国际会议
杭州
英文
2008-10-15（万方平台首次上网日期，不代表论文的发表时间）