Raw materials are delivered directly to the plant via pipeline, with batch information tracked throughout the entire process. During the polymerization and solid-state polycondensation (SSP) stages, key parameters—including intrinsic viscosity, carboxyl end-group content, color values, melting point, moisture content, and ash content—are continuously monitored. The PET chips are processed on dedicated production lines tailored for specific applications, such as water bottles, edible oil bottles, hot-fill containers, and carbonated beverage bottles; prior to packaging, each batch undergoes rigorous inspection for visual defects and foreign matter. Supported by an online analysis and data platform—recognized as a provincial-level "intelligent factory" initiative—the system enables full traceability for every pallet, linking it back to the specific raw material batch, process parameters, and inspection records. Consequently, the Certificate of Analysis (COA) and the Declaration of Conformity provided with each shipment can be precisely matched to the individual batch.