Structural modifications to the pulper for enhanced energy efficiency and fiber quality in recycled paper production

Abstract In this study aimed at enhancing energy efficiency and pulp quality in recycled paper production, the structural optimization of a pulper system was investigated with respect to its effects on the process. Key modifications, including the reduction of rotor blade count, redesign of the screen perforations into a conical geometry, and narrowing of the rotor-to-screen clearance, were implemented to evaluate system performance. Following these improvements, energy consumption was reduced by 8.32 %, the Schopper-Riegler (°SR) degree increased from 20 to 25, and retention time decreased from 7 to 5 min. Significant enhancements were observed in fiber morphology and the mechanical properties of the paper. The revised pulping system yielded a more homogeneous and denser pulp structure, which contributed to increased production capacity and a more sustainable manufacturing process. The results demonstrate that simultaneous improvements in both energy savings and product quality are achievable in recycled paper production.