Spandex is a polyurethane fiber, which is also called elastic fiber because of its excellent elasticity, and has been widely used in clothing fabrics. Spandex is a kind of elastic fiber composed of linear macromolecules composed of chain link units containing at least 85% carbamate (or ether) when it is block copolymerized with other polymers. Manufacturer of edging webbing Dry spinning is now widely used.
1. Morphological structure
The cross section of the spandex fiber is round and broad bean shaped, and the longitudinal surface is dark and deep, showing unclear bone shaped stripes.
2. Moisture absorption
The hygroscopicity is poor, and the moisture regain under general atmospheric conditions is 0.8% - 1%.
3. Mechanical properties
It has high elongation and high elasticity, which is also the characteristic of spandex. The elongation at break can reach 4-5 times, and the elongation recovery rate within the elongation at break can reach more than 90%. In addition, the retraction force during springback is less than the tensile force, so Selvedge webbing It is comfortable to wear and has no pressure like rubber wire. The strength is 2 to 3 times higher than that of rubber filament, but lower than that of other common textile fibers.
