yarn. Friday , March 16th , 2018 - 02:26:37 AM
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.
There are several thicknesses of craft yarn also referred to as weight. This is not to be confused with the measurement and/or weight listed above. The Craft Yarn Council of America is making an effort to promote a standardized industry system for measuring this numbering the weights from (finest) to 6 (heaviest). Some of the names for the various weights of yarn from finest to thickest are called lace fingering sport double-knit (or DK) worsted aran (or heavy worsted) bulky and super-bulky. This naming convention is more descriptive than precise; fibre artists disagree about where on the continuum each lies and the precise relationships between the sizes.
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