1. It is caused by too fine spandex, which can be replaced with thicker one.
2. Spandex coated yarn is an elastic yarn formed by wrapping the elongated spandex yarn with spandex yarn as the core and filament or short fiber yarn in a spiral manner.
The strength and elongation of air coated yarn increase with the increase of spandex pre drafting multiple. After drafting to a certain value, the retraction of spandex yarn makes the outer fiber curl; Properly increasing the pre draft ratio will reduce the percentage of spandex and increase the crimp degree of outer fiber. However, when the draft is too large, the deformation range of spandex is close to the critical value of deformation, which will reduce the strength and elongation of coated yarn, but it is conducive to the evenness of coated yarn.
