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권솔(Sol Kwon),김철환(Chul-Hwan Kim),이지영(Ji-Young Lee),박형훈(Hyeung-Hun Park),임현택(Hyun-Tek Yim),구호경(Ho-Gyeong Gu),민병걸(Byung-Gul Min) 한국펄프·종이공학회 2017 펄프.종이技術 Vol.49 No.6
Bleached kraft pulps with different dimensions were refined by the refiner plates designed and manufactured for this study. One pulp has a length-weighted mean fiber length of 2.90 mm and a coarseness of 15.5 mg/100 m. Another pulp has a length-weighted mean fiber length of 0.68 mm and a coarseness of 9.25 mg/100 m. The long- and thick-fiber pulp (Pulp I) was refined by the plate of coarse fillings with lower cutting edge length (CEL), and the short- and thin-fiber pulp (Pulp II) was refined by the plate of fine fillings with higher CEL. The fiber length of pulp I was sharply reduced at the beginning of refining, and, on the other hand, that of pulp II was more slowly reduced. Coarse fillings against Pulp I led to more cutting rather than fibrillation, and fine fillings against Pulp II promoted more external and internal fibrillation. Due to the dimensional characteristics, the long and coarse fibers required more refining energy in gaining the designated freeness level than did the short and thin fibers. At a given refining amount, the finer fillings led to the slower increment in tensile strength than did the coarser fillings. However, tear strength of pulp I sharply improved at first and thereafter rapidly dropped, whereas pulp II steadily increased and then gradually decreased with prolonged refining. Based on these results, more gentle refining for the pulp such as pulp II was required to obtain desirable fibrillation and energy savings, and therefore a novel manufacturing technology such as a laser technology and diffusion bonding differently from casting should be applied to develop much finer filling with the combination of high cutting edge length and hydraulic capacity.
이지영(Ji-Young Lee),권솔(Sol Kwon),이민석(Min-Seok Lee),서정민(Jeong-Min Seo),이정숙(Jeong-Suk Lee),김철환(Chul-Hwan Kim) 한국펄프·종이공학회 2016 펄프.종이기술 Vol.48 No.4
Light-induced yellowing of mechanical pulps proceeds through photooxidative discoloration of lignin in fibers. Lignin absorbs near UV light, which creates short-lived, high-energy excited molecules generating free radicals. Free radicals reacts in the presence of oxygen to form yellow chromophores. Several different strategies have been applied to inhibit photoyellowing of thermomechanical pulps (TMP). Even though the initial brightness of TMP bleached by sodium borohydride was lower than that of TMP done by hydrogen peroxide, sodium borohydride decreased the rate of photoyellowing more than did hydrogen peroxide. UV-light absorbers treated on BTMP adsorbed UV radiation more strongly than untreated pulp. Hardwood bleached kraft pulp (Hw-BKP) mixed with BTMP contributed to the decrease in the rate of photoyellowing. When oxidized starch adding UV absorbers coated paper containing BTMP, the UV absorbers had a meaningful effect on the inhibition of photoyellowing.