chloe. yarn. May 27th , 2018.
Yarn is composed of twisted strands of fiber which are known as plies when grouped together.8 These strands of yarn are twisted together (plied) in the opposite direction to make a thicker yarn. Depending on the direction of this final twist the yarn will have either s‑twist (the threads appear to go "up" to the left) or z‑twist (to the right). For a single ply yarn the direction of the final twist is the same as its original twist. The twist direction of yarn can affect the final properties of the fabric and combined use of the two twist directions can nullify skewing in knitted fabric.
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 quantities for handcrafts are usually measured and sold by weight in ounces or grams. Common sizes include 25 g 50 g and 00 g skeins. Some companies also primarily measure in ounces with common sizes being three-ounce four-ounce six-ounce and eight-ounce skeins. Textile measurements are taken at a standard temperature and humidity because fibers can absorb moisture from the air. The actual length of the yarn contained in a ball or skein can vary due to the inherent heaviness of the fibre and the thickness of the strand; for instance a 50 g skein of lace weight mohair may contain several hundred metres while a 50 g skein of bulky wool may contain only 60 metres.
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