Spandex, scientific name “polyurethane fiber”, is the most popular & widely used elastic fiber. Over 94.5% of the world‘s spandex fibers are produced by solution dry spinning. In addition, there are melt spinning, reaction spinning, solution wet spinning. The advantage of the melt spinning method is that it does not need to add chemical solvents, and does not need to use water. It is more ecofriendly and energy-saving, and the product is non-toxic and harmless