RESEARCH ON DISPERSION MECHANISM OF STICKIES IN HEAT DISPERSION OF RECYCLED FIBER BASED ON HIGH-SPEED PHOTOGRAPHY TECHNOLOGY
Recycled fibers have become a main fiber resource for the paper industry. Stickie contaminants, a collection of tacky, adhesive-like materials, are considered to be one of the greatest barriers to increasing Secondary fiber usage. Dispersion treatment, the aim of which is to disperse contaminants to such an extent that their detrimental effects are reduced, is used to improve the pulp appearance characteristics. This research aims to identify how those stickie contaminants are dispersed. It focuses on recording the complete process of the dispersion of stickies with a high-speed and resolution camera. The discs of the refiner are made of organic glass, which makes the camera recording possible. A selective dye to stain stickie particles can be identified when performing image analysis. Stickies’ distribution and motion in the refining zone of a refiner were recorded by a high-speed camera. By means of moving object tracking, the trajectories of the single moving stickie and its dispersed fragments are available. With a series analysis of the images and trajectories, it can be found that dispersion is a comprehensive effect of the following four kinds of acting force: (1) resistance in the phase interface; (2) acceleration force; (3) interaction force among fibers or between fibers and stickies; (4) friction applied on the pulp by the grinding teeth. It would be a misunderstanding that there is only wallop action and pressure of refiner discs to disperse stickies. Actually, the force of resistance in the phase interface and friction is also a main cause of the dispersion of stickies. The force model is established in this paper.
stickie contaminants heat dispersion treatment high-speed photography technology force model dispersion mechanism
Zou Anlin Zhu Xiaolin Liu Huanbin
State Key Laboratory of Pulp and Paper Engineering,South China University of Technology, Guangzhou,510640, China
国际会议
广州
英文
1029-1032
2010-11-08（万方平台首次上网日期，不代表论文的发表时间）