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충전물의 Coagulation이 탈수 및 건조효율에 미치는 영향
윤병태,오세균,전양,Yoon, byoung-Tae,Ow, Say-Kyoun,Jeon, Yang 한국펄프종이공학회 1998 펄프.종이기술 Vol.30 No.2
This study was aimed to investigate any improvement of dewatering and energy saving on the papermaking process when the various types of fillers were used, i.e., clay, talc and grounded calcium carbonate (GCC). Cationic polyelectrolyte and alum coagulants neutralized the surface charge of the filler particles and the filler particles were coagulated. The rates of dewatering and drying were investigated. The results indicated that clay tended to intense anion, while talc and GCC tended to anion trend nearly to neutrality. Clay and talc added with EPI-DMA, P-DADMAC and alum respectively as optimum levels showed a significant efficiency on the dewatering and the turbidity dissipation. However, the turbidity and dewatering rate of GCC decreased, when GCC was added with EPI-DMA and P-DADMAC respectively Drying rate of clay was increased when coagulant added. However drying rates of talc and GCC were not affected by coagulant, while the apprarent drying time of talc and GCC in the absence of any coagulant was shorter than the clay in the presence of a coagulant. The result confirmed that talc or GCC was more efficient than clay on the dewatering and drying, which is consistent with a general knowledge in the collodal science.
윤병태,류정용,신종호,송봉근,김태준,전양,Yoon, Byoung-Tae,Ryu, Jeong-Yong,Shin, Jong-Ho,Song, Bong-Keun,Kim, Tae-Joon,Jeon, Yang 한국펄프종이공학회 2000 펄프.종이기술 Vol.32 No.2
This study was to get the optimum conditions on bleaching by mixing of various colored ledgers with white ledger by 50:50 ratio. This bleaching was carried out by two steps, reductive-oxidative process was shown a better brightness compared to oxidative-reductive one. Especially, in reductive bleaching using sodium hydrosulfite, the aging temperature should keep above 6$0^{\circ}C$ irrespective of aging time, alkaline condition was more effective than acid one. Final brightness after bleaching and feinting was obtained over 78% to be used by the raw pulp of tissue.