yarn. Friday , March 16th , 2018 - 02:24:22 AM
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.
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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