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가압리화이닝법에 (加壓) 의한 젓나무의 고수율펄프 (高收率) 제조에 관한 연구
조남석,조병묵 ( Nam Seok Cho,Byoung Muk Jo ) 한국산림과학회 1981 한국산림과학회지 Vol.53 No.1
Neutral sulfite precooked fir chips were refined in the Asplund Laboratory Defibrator at various temperature (20℃, 120℃ and 180℃). The effects of refining temperatures on the physical property and morphological structure of the resulting pulps were discussed. Yields of precooked chips (84%, 92% and 100%) and refining temperature affected remarkably the yield of refined pulp, its beatability, sheet strength and morhphological characteristics, Pulp yield and beatability decreased with increasing refining temperature. Fiber surface of unbeaten pulp from precooked chips of 84% yield was to some extent covered by the secondary wass, while that of the pulp form precooked yield of 92% by the compound middle lamella. In the case of uncooked chips, fibers were damaged heavily, and the exposed fiber surface resulted from the equal amount of the secondary wall and the compound middle lamella. In the case of pulps prepared from precooked chips of higher yields (92% and 100%), sheet strength increased linearly as sheet density increased, But at the same sheet density, pulp from lower precooked yield (84%) had better sheet strength after open discharge refining as compared to pressurized refining, because pulp from the former had much amounts of fines fraction of higher water retention value than the latters. And there was observed a little difference in fiber length distribution buty nearly similar in its morphology with increasing refining temperature.