The characteristics and characteristics of spandex knit […]
The characteristics and characteristics of spandex knitted fabrics are excellent. The strength is to times higher than that of the latex, and the linear density is also finer, and it is more resistant to chemical degradation. Spandex is good in acid and alkali resistance, sweat resistance, seawater resistance, dry cleaning resistance and abrasion resistance. Spandex knitted fabrics feature synthetic fibers with high elongation at break , low modulus and high elastic recovery. The Chinese trade name of multi-block polyurethane fiber. Also known as elastic fiber.
Spandex has high elongation , low modulus of elasticity and high elastic recovery . In addition to the greater strength, other physical and mechanical properties are very similar to natural latex yarns. It is more resistant to chemical degradation than latex yarns, has moderate thermal stability, and has a softening temperature above about . Most dyes and finishes for synthetic fibers and natural fibers are also suitable for the dyeing and finishing of spandex. Spandex is resistant to sweat, seawater and various dry cleaning agents and most sunscreens. Long-term exposure to sunlight or in chlorine bleach will also fade, but the degree of discoloration will vary greatly depending on the type of ammonia.
Spandex fiber has such high elasticity because its polymer chain is composed of a low melting point, an amorphous "soft" segment and a high melting point, crystalline "hard" segment embedded in it. Composed of. The molecular chain of the flexible segment has a certain network structure with a certain cross-linking shape, and the interaction between the molecular chain phases is small, and can be freely stretched, resulting in large elongation performance. The rigid chain segment molecules have a relatively large chain binding force, and the molecular chains do not elongate without limitation, resulting in high resilience.
The cross section of the rayon filament is mostly dog-bone-shaped and some of the filament surface is slippery or jagged. The breaking strength is the lowest among all textile fibers, only dtex the strength of the polyether type is higher than that of the polyester type.The moisture absorption range is small, generally the rate of multifilament moisture absorption It is slightly higher than the monofilament. The heat resistance varies greatly depending on the variety. Most of the fibers are stored in a short period of time between 90 and . The fibers are not damaged. The safe ironing temperature is below 150 ° C, which can be warmed and dried. Disturb and wet wash. The dyeing performance is superior, the dyes can be dyed in various colors, the dye has strong affinity for fibers, can adapt to the dyes of most kinds of products, and has good chemical resistance, and is resistant to most of the acid and alkali. Chemicals, organic solvents, dry cleaning agents and bleaches, as well as resistant to sun and snow, but not resistant to oxides, tend to make fibers less powerful and less powerful.
|polyester with rayon piece dyed|