Comparison of characteristics of nylon webbing and nylon material
When the nylon ribbon in a molten state is slowly cooled, spherulites are rapidly formed at 235 to 245 °C. The spherulites are contained not only in the crystalline portion but also in the amorphous portion, and the crystallinity is 20% to 40%.
The spherulites have positive spherulites which are preferentially oriented in the radial direction and negative spherulites which are preferentially oriented in the tangential direction. Nylon-66 spherulites are usually normal spherulites, but negative spherulites can be formed when heated and melted at 250-265 °C. The spherulite formation rate and spherulite size, in addition to being significantly affected by the cooling temperature, are also affected by factors such as melting temperature and molecular weight.
Polyamide fibers are a general term for fibers having a C9-NH group on a macromolecular chain. The main types of aliphatic polyesteramines are polyamide 6 and polyamide 66. The trade names of China are nylon 6 and nylon 66. The nylon fiber is mainly composed of filaments, and a small amount of short fibers are mainly used for blending with cotton, wool or other chemical fibers. Nylon filament yarn is used in a large number of deformation processing to produce elastic yarn as a raw material for weaving or knitting. Nylon fibers are generally spun by melt spinning. The strength of nylon 6 and nylon 66 fiber is 4 to 5.3 cN/dtex, the strength of high strength polyester is 7.9 cN/dtex or more, the elongation is 18% to 45%, and the elastic recovery rate at 10% elongation is above 90%. According to the measurement, the abrasion resistance of nylon fiber is 20 times that of cotton fiber, 20 times of wool, and 50 times of viscose.