Lightweight packaging in the pulp and paper industry has received much attention as an effective way to reduce CO₂ emissions. One challenge is that the tensile strength of packaging papers, which determines the maximum load, has to be comparable to that of conventional packaging materials. In a pulp digester, wood fibers are chemically separated and physically deformed during pulping, resulting in the dynamic change of tensile strength of end-use papers. In this work, the deformation of fiber during Kraft pulping is described by integrating the multiscale modeling framework of Choi and Kwon (2019a) and the classical column buckling theory. Then, an approximate model is identified and employed to design a model predictive control system to regulate the fiber deformation during pulping. The proposed control system achieved a lower degree of fiber deformation than a conventional pulping strategy, thereby contributing to the enhanced tensile strength of end-use papers.

纸浆和造纸行业的轻质包装作为减少 CO ₂的有效方法备受关注排放。一项挑战是决定最大载荷的包装纸的拉伸强度必须与传统包装材料的拉伸强度相媲美。在纸浆蒸煮器中，木纤维在制浆过程中发生化学分离和物理变形，导致最终用途纸张的抗张强度发生动态变化。在这项工作中，通过整合 Choi 和 Kwon (2019a) 的多尺度建模框架和经典的柱屈曲理论来描述牛皮纸制浆过程中纤维的变形。然后，确定并采用近似模型来设计模型预测控制系统，以调节制浆过程中的纤维变形。与传统的制浆策略相比，所提出的控制系统实现了更低程度的纤维变形，