yarn. Friday , March 16th , 2018 - 02:00:55 AM
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.
Protein yarns (i.e. hair silk feathers) may also be irritating to some people causing contact dermatitis hives wheezing or other reactions. Plant fibers tend to be better tolerated by people with sensitivities to the protein yarns and allergists may suggest using them or synthetics instead to prevent symptoms. Some people find that they can tolerate organically grown and processed versions of protein fibers possibly because organic processing standards preclude the use of chemicals that may irritate the skin.
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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