국내산 소나무로 제조되는 열기계펄프 제조 기술 최적화연구 (1) - 목재 칩의 전처리와 리파이닝 시 온도와 NaOH 처리의 효과 -

Abstract

Thermomechanical pulping process uses large amounts of energy, mostly electricity to run electrical facilities. Thermomechanical pulp (TMP) made from Pinus densiflora also has a big drawback that refining consumes 90 per cent of the total energy used in TMP process. This study explored to draw up a way to save refining energy through different thermal treatment at the stages of presteaming and refining. Presteaming temperature was 80℃, 100℃, and 120℃. After presteaming at each temperature, refining was carried out at 100℃, 120℃, and 140℃respectively. In a presteaming stage, steaming temperature over 120℃greatly contributed to the decrease of refining energy leading to earlier attainment of a target freeness, irrespective of refining temperature. In addition, NaOH treatment with presteaming enhanced better development of fiber properties during refining than presteaming without NaOH. High temperature refining at 140℃produced a high strength paper, and wood chips treated by alkali responded betterto refining than at over 120℃. Improved softening effect on wood chips led to the decrease in shives contents but it gave no effect on pitch contents of TMP.