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Paper Information

Journal:   IRANIAN JOURNAL OF WOOD AND PAPER SCIENCE RESEARCH   SUMMER 2018 , Volume 33 , Number 2 (63) #p00538; Page(s) 231 To 243.

Characterization of cellulosic fines in kraft, chemi-mechanical, and OCC recycled pulps

Author(s):  AZIZI J.*, RAMEZANI O., Rasooly E., RUDI H.
* Department of Biorefinery Engineering, Faculty of New Technologies and Energy Engineering, Shahid Beheshti University, Tehran, Iran
Cellulosic fines are essential parts of paper making system which imparts remarkable effects on the production process parameters and the quality of final product. In this study, properties of fiber fines prepared from three kinds of pulps including kraft, chemical mechanical (CMP), and recycled (OCC) were investigated. Required amounts of fines were prepared using Valley Beater apparatus. Then the fines were classified into three categories using dynamic drainage Jar (DDJ): fines passing 100 meshes remained on 200 meshes (P100/R200), fines passing 200 mesh remained on 325 mesh (P200/R325), and fines passing 325 mesh (P325). Fines properties including dimension, special hydrodynamic volume, colloidal charge, alkalinity, turbidity, viscosity, and specific area were measured. The results revealed that PH of fiber suspensions tended alkaline concurrently to the decreasing in dimension of fines. Additionally, the colloidal charge of the three types of fines, especially the charge associated with the fines passed through 200 mesh screens and remained on 325 meshes, showed a different behavior compared to those in the same classes with the adverse trend to the viscosity variation. Special hydrodynamic volume is consistent with the dimension and dimensional ratio with the lowest amount of it observed in the recycled pulp fines. Turbidity has a direct relationship with particles size, homogenous distribution and the specific area of the fines The results of turbidity related to the fines passed through 200 mesh size showed different behavior compared to other categories.
Keyword(s): Fiber fines,aspect ratio,hydrodynamic specific volume,colloidal charge,specific surface area
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