From the perspective of China’s polyester filament yarn development, it developed from conventional spinning to high-speed spinning, which started from chip spinning. As the stable development of PET melts spinning polyester filament and rapidly increased numbers of chip spinning manufacturers, the profit of regular chip spinning filaments is going down sharply. Therefore, the chip spinning enterprises, which are not superior in cost, are forced to seek reform in order to compete with melt direct spinning ones.
Our country started the research and development of chip spinning polyester filament through the study about the development progress of overseas countries and analysis about fiber structure of high value-added imported polyester fabrics at that time. At first, the various profiled filament was introduced to the market, and then came colored filament, cationic modification filament, different contraction mixed fiber, flame retardant polyester filament, polyester silk brocade composite fiber, sea-island composite fiber, high shrinkage, total extinction fiber, superfine fiber (dpf 0.3 or less), composite fiber, conductive composite fiber, civil and industrial polyester monofilament, etc.
With the continuous emergence of various differentiated polyester filaments, the profit margin of chip-spinning polyester filament has not been enlarged by melt spinning one but has gradually gone up. In recent years, the profit margin of related enterprises has even exceeded that of melt direct spinning filament enterprises. With the newly opened track of differentiation, chip spinning enterprises can better meet the needs of users, forcing melt direct spinning enterprises to explore and produce differentiated polyester filament as well.