From a thermodynamic point of view, the strain applied to the polymer reduces the amorphous state, resulting in the decrease of melting point, the increase of melting point and the increase of undercooling at a given temperature. However, in the spinning process, the temperature of the polymer generally decreases from the equilibrium melting point to or near the glass transition temperature. Nevertheless, it can still be observed that the acceleration degree of the crystallization process of various polymers is different. For example, for polyethylene terephthalate, the primary fiber nylon tie with very low crystallinity is relatively easy to obtain, while for polyamine, it is much more difficult, although the strain-free crystallization rate of polyamine is very low. Cable ties are often used in wholesale of switches and sockets.