yarn. Friday , March 16th , 2018 - 01:41:27 AM
Other animal fibers used include alpaca angora mohair llama cashmere and silk. More rarely yarn may be spun from camel yak possum musk ox cat dog wolf rabbit or buffalo hair and even turkey or ostrich feathers. Natural fibers such as these have the advantage of being slightly elastic and very breathable while trapping a great deal of air making for a fairly warm fabric.
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.
Cotton and polyester are the most commonly spun fibers in the world. Cotton is grown throughout the world harvested ginned and prepared for yarn spinning. Polyester is extruded from polymers derived from natural gas and oil. Synthetic fibers are generally extruded in continuous strands of gel-state materials. These strands are drawn (stretched) annealed (hardened) and cured to obtain properties desirable for later processing.
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