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Effects of Cultivating Methods and Area on the Mechanical Properties of Cotton Fiber and Yarn

Kobe University, 3-11 Tsurukabuto, Nada-ku, Kobe, Hyogo, 657-8501, Japan, inouema{at}kobe-u.ac.jp

Shinji Yamamoto

Kobe University, 3-11 Tsurukabuto, Nada-ku, Kobe, Hyogo, 657-8501, Japan

Yukako Yamada

Osaka Kyoiku University, 4-698-1 Asahigaoka, Kashiwara, Osaka, 582-8582, Japan

Masako Niwa

Nara Women’s University, Kitauoya-higashi, Nara, 657-8506, Japan

Two kinds of cotton fibers cultivated by different methods were measured and the mechanical properties of these fibers were compared with the mechanical properties of cotton yarns made of organic cotton fiber and non-organic cotton fiber. In this study, the mechanical properties of single cotton fibers and cotton yarns the authors measured and the moduli were calculated by assuming that the cross-section of the cotton fiber is elliptical. It was also found that the strains and stresses of breaking point of organic cotton fibers were larger than those of non-organic cotton fibers. Cotton fibers cultivated in different areas were then examined and it was found that the moduli of cotton fibers cultivated in the northern or southern hemisphere (USA and Australian cottons in this study) were very similar, and the yarn properties for yarns made from cotton fibers from both areas were also very similar. However, the yarn consisting of a mixture of cottons in the northern and southern hemispheres had larger strain, torsional stiffness and hysteresis. It was concluded that the deterioration of fibers consisting of a mixture of cotton contributes to the yarn properties, because the rules of surface orientation differ for cotton fibrils cultivated in the northern and the southern hemisphere as shown in Onogi’s study (Textile Res. J. 66, 406-410 (1996)).

Key Words: cotton fiber • cotton yarn • tensile property • shear property • compression property

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