Study on fiber bonding strength in modeling of paper tensile strength with fiber characteristics

COMP 240

J. S. Tao, chinatjs@163.com, D. B. Yan, H. B. Liu, Y. G. Xu, S. L. Kou, and H. k. Ge. State Key Lab. of Pulp & Paper Engineering, South China University of Technology, Wushan Road, Tianhe District, Guangzhou, 510641, China
Fiber bonding strength, which is usually evaluated by relative bonded area (RBA), plays an important role in modeling of paper tensile strength as well as fiber length, width, coarseness, zero span tensile strength, etc. However, it is difficult to measure RBA with the traditional methods of light scattering and gas absorption. A novel method to measure the flexibility index (FI) of fibers was carried out to evaluate fiber bonding strength in place of the traditional ways in this paper. Based on beam-bending theory and digital image processing technology, which can obtain the quantitative FI easily with the aid of charge coupled device (CCD) camera, frame grabber, image processing software and computer. Five kinds of chemical pulp fibers and mechanical pulp fibers were tested and the results showed that FI is in good agreement with RBA. Strong evidence was offered that FI could explain fiber bonding strength instead of RBA in modeling of paper tensile strength, and benefited modeling to realize online real-time estimation of the paper tensile strength for paper mills.