| 초록 |
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 $80^{ circ}C$ , $100^{ circ}C$ , and $120^{ circ}C$ . After presteaming at each temperature, refining was carried out at $100^{ circ}C$ , $120^{ circ}C$ , and $140^{ circ}C$ respectively. In a presteaming stage, steaming temperature over $120^{ circ}C$ 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 $140^{ circ}C$ produced a high strength paper, and wood chips treated by alkali responded better to refining than at over $120^{ circ}C$ . Improved softening effect on wood chips led to the decrease in shives contents but it gave no effect on pitch contents of TMP. |
