yarn. Thursday , May 31st , 2018 - 07:25:14 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.
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.
Yarn is selected for different textiles based on the characteristics of the yarn fibres such as warmth (wool) light weight (cotton or rayon) durability (nylon is added to sock yarn for example) or softness (cashmere alpaca).
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