纱线卷曲Yarn Crimp.pdf

}  This module includes advanced manufacturing techniques for ◦  Weaving – Xiaogang Chen ◦  Knitting – Anura Fernando ◦  Clothing – Richard Kennon ◦  Spinning – Hugh Gong (TST/TTBM only) }  For weaving, we will cover ◦  Yarn crimp in woven fabrics ◦  Cloth formation Theory ◦  Study on weaving shrinkage ◦  Design and manufacture of 3D fabrics }  Lab classes on weaving ◦  (1) cloth formation and (2) Weaving 3D fabrics }  K. Greenwood, Weaving: Control of Fabric Structure }  Doris Goerner, Woven Structure and Design, Part 2 Compound Structures }  Z Grosicki, Watson’s Advanced Textile Design }  X. Chen, Characteristics of cloth formation in weaving and their influence of fabric parameters, Textile Research Journal, 75(4), 281-287, 2005 }  X. Chen, Chapter 8: Interwoven fabrics and their applications, in Specialist yarn and fabric structures }  X. Chen, L.W. Taylor, L-J. Tsai, An overview on fabrication of 3D woven textile preforms for composites, Textile Research Journal , Vol.81(9), 932-944, 2011 Topic 1 Yarn Crimp in Woven Fabrics L S Fig.1 Yarn (L) and fabric (S) lengths L L − S L S C = = − 1 S S Fig.1 Yarn (L) and fabric (S) lengths Yarn crimp is defined as the ratio of difference between the yarn and fabric lengths to the fabric length. In weaving a fabric, the effective reed width is 1.50 metres, and the fabric width becomes 1.42 metres when the fabric is wound onto the cloth roller. Find the weft crimp in the fabric due to weaving.   “The effective reed width is 1.50 metres” - When weft yarn was straight, it measures 1.50 metres. Thus L = 1.50 m Fabric width becomes 1.42 metres when the fabric