Thickness Variations of Length-distributed Slivers and Draft Conditions in Roller Drafting
Roller drafting is an important operation in staple yarn production. The drafting conditions affect the product qualities strongly,depending on the fiber length of the constituent fibers. This study reports on the thickness variations of the output slivers according to the draft conditions such as roller adjustment and draft ratio for the slivers with a uniform fiber length or with a fiber length distribution. Experimental results revealed that the output linear density was influenced by the fiber length distribution and process conditions. The output sliver was more regular in low draft ratio level for the length distributed fibers than the uniform length fibers. In the level higher than 30 of the draft ratio,the length distribution effect disappeared. There was a critical condition under which the irregularity began increasing abruptly. The bundle with a uniform fiber length had the critical condition at lower draft ratio and longer roller adjustment than the length distributed.For the dynamic model describing the bundle flow,the bear diagram was taken into consideration. And the output linear density was simulated,while a random variation for the input linear density was assumed. The simulation results coincided well with the experiments,which confirmed the feasibility of the model equipped with fiber length distribution.
Fiber length distribution Roller adjustment Draft ratio Irregularity Bundle flow Dynamic model
Jong S.Kim Jung Ho Lim You Huh
Laboratory of Intelligent Process and Control,College of Engineering,Kyunghee University,Yongin,449- Department of Textile Engineering,Graduate School,Kyunghee University,Yongin,449-701,R.O.Korea Department of Mechanical Engineering,College of Engineering,Kyunghee University,Yongin,449-701,R.O.K
国际会议
杭州
英文
258-271
2010-10-20（万方平台首次上网日期，不代表论文的发表时间）