Strength of Spandex Coated Yarn

Apr 06,2023

The breaking strength of spandex filament is slightly lower in the wet state than in the dry state, which is 3-5 times that of rubber filament; The heat resistance of different varieties of spandex varies greatly, and most spandex fibers will not be damaged when stored for a short period of time at 95-150 ℃. When using polyester polyurethane coated yarn for knitted fabric, spandex is required to be able to withstand high temperatures, especially in the production of single sided fabrics. However, ordinary spandex used for nylon and polyurethane generally does not have quality issues. At temperatures above 150 ℃, spandex fibers turn yellow, become sticky, and their strength decreases. Spandex generally exists in fabrics covered by other fibers, so it can withstand higher heat setting temperatures (180 ℃ -190 ℃), but the time is shorter. Spandex is resistant to most acids, alkalis, and chemical solvents, but some varieties have poor acid and alkaline resistance. Polyester spandex will decompose in hot alkali. Bleaching agents such as sodium hypochlorite can cause it to turn yellow and decrease its strength. These knowledge should be highly valued by weaving and dyeing factories, especially elastic fabric manufacturers, when dyeing grey fabrics.