Textile Science and Engineering (한국섬유공학회지)

The Korean Fiber Society (한국섬유공학회)
권호 표지

Operation Adjustment and Sliver Thickness Variation in Roller Drafting

롤러 드래프트의 조작 설정과 슬라이버 굵기의 변동 특성

  • Kim, Jong-S. (Laboratory for Intelligent Process and Control, Kyung Hee University) ;
  • Huh, You (Department of Mechanical Engineering, College of Engineering, Kyung Hee University)
  • 김종성 (경희대학교 지능공정 및 제어 실험실) ;
  • 허유 (경희대학교 공과대학 기계공학과)
  • Received : 2011.01.31
  • Accepted : 2011.03.02
  • Published : 2011.08.28
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Abstract

Fibers' length distributions were shown to affect their linear density. They depended on processing conditions such as draft roller adjustment and draft ratio. Random variational signals were applied as input bundles and output linear densities were simulated at various draft roller adjustments and draft ratios using the dynamic model equipped with various velocity variance models for fiber length distribution. Draft roller adjustment and draft ratio led to process resonance and increased irregularity in the output linear density. Increasing draft roller adjustment reduced linear density in CV%, while process resonance occurred at draft roller adjustments of 1.1-1.25 times of the maximal fiber length. Length distributed bundles had lower fundamental frequencies (longer fundamental wavelengths) than uniform fibers. High draft ratios induced greater irregularities in the output bundles, with process resonance occurring at draft ratios of 20-30. Draft ratios above 30 led to output linear density including wide ranging regularly oscillatory components of irregularity that corresponded to integer multiples of the fundamental frequency.

Keywords

Acknowledgement

Supported by : 한국과학재단

References

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