| Abstract:This study utilized pre-hydrolyzed corn straw-based chemical thermomechanical pulp (C-CTMP) and old corrugated container (OCC) pulp as raw materials to improve the performance of corrugated base paper through optimizing the pulping, blending, and sizing processes. The results indicated that after PFI refining of C-CTMP for 5000 revolutions (pulp consistency of 45 °SR), the paper's breaking length (5.64 km), burst index (2.60 kPa·m2/g), tear index (1.35 mN·m2/g), and ring crush index (8.74 N·m/g) all reached relatively optimal levels. For the waste paper pulp refined to 34 °SR by PFI for 2000 revolutions, its breaking length and ring crush index were 3.36 km and 6.16 N·m/g, respectively. In terms of blending, corrugated base paper was prepared by mixing C-CTMP at 40% and OCC at 60%. Its mechanical properties, including bulk (0.62 g/cm3), burst length (4.25 km), and ring crush index (8.24 N·m/g), all demonstrated excellent performance. Additionally, when the dosage of alkyl ketene dimer (AKD) was 0.25% and that of cationic starch (YZ-122) was 1%, the paper's bulk (0.60 g/cm3), breaking length (4.56 km), ring crush index (8.62 N·m/g), and Cobb value (13.00 g/m2) all met the quality requirements of Grade A corrugated base paper as stipulated in GB/T 13023-2008. |