An increasingly important branch of textile technology is the geometry of fabric structure,of a subject which forms rational foundation upon which to base a scientific study of fabric construction.The appearance ,handle.drape ,and general behavior of fabric are dependent upon many factors such as materials used ,yarn structure,weave, and finish.Just how these factors such interact is a major problem comforting the fabric engineer.One important dimension required in the study of fabric geometry is the diameter of a yarn ,a first assumption being that a yarn has in fact ,a circular cross-section .In a practice,it is recognized that even if a yarn were circular to being with,it would be distorted that when interlaced with other threads,and later perhaps flattened when during calender .
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