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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

An investigation of yarn hairiness.

Chang, Lingli, mikewood@deakin.edu.au January 2002 (has links)
Yarn hairiness affects not only the quality of products, but also the productivity in spinning and weaving. Too much yarn hairiness is undesirable for many end uses as well as the spinning and post spinning processes. The main aims of this project are to examine the hairiness features of various yarns and to reduce yarn hairiness. The thesis covers five related areas – hairiness assessment, factors affecting yarn hairiness, the hairiness of newly developed yarns, yarn hairiness reduction, and effect of yarn hairiness on the energy consumption in ring spinning. The worsted cashmere, pure wool and wool/cashmere blend yarns were employed to investigate the effect of some fibre parameters on the yarn hairiness. A single exponential distribution of the hair-length was confirmed first, using the data from the Zweigle G565 Hairiness Meter. A linear relationship was observed between the blend ratio and the hairiness indexes. In particular, the effect of fibre crimp or curvature on yarn hairiness is examined. The theory of yarn hairiness composition was also developed further. The effect of draft ratio and spindle speed on the hairiness of worsted wool yarn was examined next with a factorial experiment design. Several new hairiness indexes, namely the relative hairiness indexes, have been used to explain the results obtained. In the investigation of the hairiness of newly developed yarns, the hairiness of the Compact Spun and Roller-Jet-Spun yarns was examined first. The composition of the yarn hairiness, the hair-length distribution, and the effect of test speed on yarn hairiness were then studied. An important finding is that for both yarns, the predominant hairiness feature is the looped hairs. A comparison of the hairiness of Solospun yarns and the equivalent ring spun wool yarns was undertaken. The hair-length distribution of the Solospun yarn was examined first. The Solospun yarns used had fewer hairs in most hair-length groups and lower variations in hairiness. In addition, the effect of twist level and spindle speed on the hairiness of Solospun and conventional ring spun yarns has also been discussed. A novel approach of reducing yarn hairiness – spinning with a ‘Diagonal’ yarn path was examined next. Both ‘Left Diagonal’ and ‘Right Diagonal’ yarn arrangements were studied. A new finding is that the ‘Right Diagonal’ yarn path leads to reduced hairiness for the Z-twist yarn, while yarn evenness and tenacity are not as sensitive to the modified yarn path. The mechanism of hairiness reduction with the ‘Diagonal’ yarn path has been discussed. The spinning performance of “Right Diagonal” yarn arrangement has also been evaluated. Finally, the effect of yarn hairiness on the energy consumption in ring spinning has been investigated theoretically and experimentally. A theoretical model has been developed, which represents the first attempt at theoretically investigating the influence of yarn hairiness on energy consumption during the winding stage of ring spinning. The experimental results have generally confirmed predictions of this model. Recommendations for further research in this area have also been made in the concluding chapter of this thesis.
2

Structure and properties of polyacrylonitrile fibres

Hu, Xiao Ping January 1994 (has links)
No description available.
3

Process-structure-property relationships of yarns produced on the card-spinning system

He, Peng 07 June 2004 (has links)
No description available.
4

Process-structure-property relationships of yarns produced on the card-spinning system

He, Peng, January 2004 (has links) (PDF)
Thesis (M.S. in T. & F.E.)--School of Textile and Fiber Engineering, Georgia Institute of Technology, 2004. Directed by Youjiang Wang. / Includes bibliographical references (leaves 92-94).
5

A study of the effects of pretwisting at the roving process on the physical properties of cotton yarns

Thompson, John Lester 08 1900 (has links)
No description available.
6

Blending cotton and polyester fibers : effects of processing methods on fiber distribution and yarn properties

Chao, Nelson Ping Ching January 1963 (has links)
No description available.
7

The motion of yarns over surfaces with friction

McGee, Craig Stanford January 1977 (has links)
No description available.
8

Studies on fiber-process-structure-property relationships in air-jet spinning

Rajamanickam, Rangaswamy January 1996 (has links)
No description available.
9

A comparative study of yarn variation value measured by electronic tester and by computations from yarn breaking strength

Chang, Yuan Chun 08 1900 (has links)
No description available.
10

On the dynamics of draw texturing.

Brookstein, David Stuart January 1976 (has links)
Thesis. 1976. Sc.D.--Massachusetts Institute of Technology. Dept. of Mechanical Engineering. / Microfiche copy available in Archives and Engineering. / Includes bibliographical references. / Sc.D.

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