COMPARISON OF THE EFFECT OF TMP PITCH CONTROL AGENTS WITH DIFFERENT MECHANISMS
The pitch contained in thermomechanical pulp negatively affects paper quality, pulp, and the papermaking process. Serious pitch and stickies problems may occur in paper recycling processes. In this study, the effects of chemicals used to control the pitch in the TMP(Themomechanical Pulp) rocess were compared. The method used to analyze the pitch-control effect was to perform image analysis after using a reagent that selectively stains only the hydrophobic pitch. Three different mechanisms, namely fixation, detackification, and dispersion, were applied to solve the pitch problem from TMP. All the control agents were effective in pitch control, and, in particular, the agents related to fixation and dispersion were found to be more effective in reducing the number and area of tacky particles per unit area in sheets and white water. However, for the detackifiers and the dispersants, but not for the fixatives, it was difficult to clearly distinguish the difference of the pitch control effects according to the change in the amount of these agents through image analysis after staining.
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