Yarn Grading: I routinely refer to grading specifications, which include the diameter and uniformity of yarn strands. A consistent diameter provides better appearance and efficiency of fabrics. A: The spandex Main refers back to the central Portion of a covered yarn manufactured from elastic materials. This central area provides elasticity https://covered-spandex-yarn54030.activoblog.com/33311766/covered-spandex-yarn-things-to-know-before-you-buy