How is to spandex produced?

about yarn How is spandex produced? THE SPANDEX STORY It is a kind of elastic fiber, the scientific name is Polyurethane fiber (Polyurethane), abbreviated (PU). It is called “spandex” in mainland China. It is highly elastic and can be stretched 6 to 7 times, but can quickly return to its original state with the disappearance […]