yarn. Friday , March 16th , 2018 - 02:34:16 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.
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.
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.
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