The 2 main yarns don't have to generally be of precisely the same variety; unique fibers and specs could be utilized to realize the desired features. Elasticity，longevity，breathability，versatility，shape retention，fantastic dyeability，lightweight Polymerization: The first step will be the polymerization from the Uncooked materials, which includes a diisocyanate along with a diol.... https://zionbowen.blogofoto.com/62950861/the-single-best-strategy-to-use-for-covered-spandex-yarn