yarn. Friday , March 16th , 2018 - 02:48:22 AM
In Europe textile engineers often use the unit tex which is the weight in grams of a kilometre of yarn or decitex which is a finer measurement corresponding to the weight in grams of 0 km of yarn. Many other units have been used over time by different industries.
Both synthetic and natural yarns can pill. Pilling is a function of fiber content spinning method twist contiguous staple length and fabric construction. Single ply yarns or using fibers like merino wool are known to pill more due to the fact that in the former the single ply is not tight enough to securely retain all the fibers under abrasion and the merino wools short staple length allows the ends of the fibers to pop out of the twist more easily.
When natural hair-type fibers are burned they tend to singe and have a smell of burnt hair; this is because many as human hair are protein-derived. Cotton and viscose (rayon) yarns burn as a wick. Synthetic yarns generally tend to melt though some synthetics are inherently flame-retardant. Noting how an unidentified fiber strand burns and smells can assist in determining if it is natural or synthetic and what the fiber content is.
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