Mill scale production of TMP with double disk refining – The effects of a mild sulfonation, atmospheric preheating and refining temperatures, 2016 International Mechanical Pulping (IMPC) Conference

The aim of this work was to study the effects of a mild dosage of sodium sulfite in chip impregnation at different temperatures during atmospheric preheating and during refining for production of TMP for printing papers using high intensity double disk refining. Two trials were performed in the 800 bdt/day double disc line at the Braviken paper mill (Holmen Paper AB, Sweden) using Norway spruce chips. During the trials, chips were impregnated in an Impressafiner where chips were preheated at 1.8 bar(g) for a few seconds and then compressed before impregnation. During impregnation, sodium sulfite was added to chips at pH 9 in dosages of 0.6 or 1.2%. Reference pulps without addition of sulfite were also produced. In the first trial, the effect of different temperatures and retention times (80°C for 6 minutes vs. 96°C for 9 minutes) in the atmospheric preheating bin following impregnation was evaluated both with and without the addition of 1.2% sodium sulfite. In the second trial, the effect of different refining temperatures (refiner house pressures of 4.6 or 6.4 bar(g), 156 or 167°C) was evaluated with different additions of sodium sulfite (0.0, 0.6 or 1.2%) during impregnation.

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