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A New Test Method to Evaluate Potential White Pitch Deposit - Influence of pH and calcium hardness -  

Shin, Eun-Ju (Dept. of Wood and Paper Science, Chungbuk National University)
Choi, Tae-Ho (Dept. of Wood and Paper Science, Chungbuk National University)
Song, Bong-Keun (Chemical Biotechnology Research Center, Korea Research Institute of Chemical Technology (KRICT))
Cho, Byoung-Uk (Chemical Biotechnology Research Center, Korea Research Institute of Chemical Technology (KRICT))
Ryu, Jeong-Yong (Chemical Biotechnology Research Center, Korea Research Institute of Chemical Technology (KRICT))
Publication Information
Journal of Korea Technical Association of The Pulp and Paper Industry / v.41, no.2, 2009 , pp. 26-33 More about this Journal
Abstract
A new testing method to evaluate the deposition potential of white pitch was developed. The new method involves depositing the potential white pitch particles on the air bubble covered plastic film in the pitch deposit tester (PDT) developed by KRICT and analysing the deposited area of white pitch using an image analyzer. In addition, the effect of two important factors (pH and calcium hardness) on white pitch deposition potential was elucidated. When pH of the coated broke stock was increased from neutral to alkali or the calcium hardness of the stock was decreased, the pitch deposit area was decreased, implying that these two factors have to be controlled during the evaluation of pitch deposition potential. It was found that hydrophobicity of the surface of latex binding films repulped is a key factor influencing white pitch deposition.
Keywords
White pitch; Pitch Deposit Tester; pH; hardness; latex binder;
Citations & Related Records

Times Cited By SCOPUS : 2
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