Base paper production utilizes recycled waste paper or wood pulp as raw materials, transforming them into base paper rolls through processes such as pulping, purification, and sheet formation. A slitter equipped with upper and lower blade assemblies cuts large rolls (6 meters wide) into smaller rolls (0.3–1.5 meters wide); during this process, tension is monitored in real-time via pressure sensors, and the blade gap is maintained within a range of 0.02–0.05 mm.
Uncoated wood-free paper (offset paper) is produced using multi-ply forming technology; the core layer employs a pulp blend of BCTMP, NBKP, and LBKP, followed by surface sizing and calendering treatments.
Corrugated board production begins with corrugating medium (base paper); the process involves unwinding the paper, preheating and applying adhesive, forming a wavy structure via corrugating rolls, and pressing/bonding the layers to create single-face or double-face corrugated board.
The production of base paper for aseptic liquid food packaging involves blending long and short fibers, refining to modify fiber morphology, and adding chemical auxiliaries such as surface and internal sizing agents.
Manufacturing base paper for tissue products requires controlling the ratio of softwood to hardwood fibers (ranging from 3:7 to 4:6) and adding sodium carboxymethyl cellulose (CMC)-at 0.5%–1.2% of the total mass-to enhance water solubility. The creping process utilizes a 45-degree angle doctor blade, increasing the paper's thickness threefold and boosting its longitudinal elongation by more than eightfold.