yarn. Friday , March 16th , 2018 - 02:49:20 AM
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.
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.
Synthetic fibers come in three basic forms: staple tow and filament. Staple is cut fibers generally sold in lengths up to 20mm. Tow is a continuous "rope" of fibers consisting of many filaments loosely joined side-to-side. Filament is a continuous strand consisting of anything from filament to many. Synthetic fiber is most often measured in a weight per linear measurement basis along with cut length. Denier and Dtex are the most common weight to length measures. Cut-length only applies to staple fiber.
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