A typical process includes:
Polymerization reaction: such as the esterification and polycondensation of PTA and EG to produce PET chips (temperature 260-290℃, vacuum degree ≤0.1MPa).
Pelletizing: The melt is cut into 3-5mm particles by an underwater pelletizer, cooled, dried, and packaged.
Quality control: Intrinsic viscosity (e.g., 0.65±0.02 dl/g for PET chips), melting point (250-260℃), and other indicators need to be tested.
