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고지재생연구(제3보)-부상부유 및 니딩처리에 의한 라이너지의 강도 및 광학적 성질 개선-
서형일,류정용,신종호,송봉근,오세균 한국펄프종이공학회 1999 펄프.종이기술 Vol.31 No.1
KOCC pulp was fractionated by air froth flotation and the resultant accept was further treated with kneading. The study on the effect of this combination process revealed that the flotation and the successive kneading were found to be effective in improving strength and drainage properties as well optical cleanliness of testliner based on 100% KOCC.
서형일,임병주,신인철,배수빈,이형익,최균,이기성 한국복합재료학회 2020 Composites research Vol.33 No.3
This study investigates the characterization on the thermal insulation properties of silicon carbide coating on the Cf-C composites. The silicon carbide coatings by chemical vapor deposition on the C/C composites are prepared to evaluate thermal resistance. Firstly, we perform the basic insulation test by thermal shock at 1350oC in air on the C/C composite and SiC-coated C/C composite. We also performed the burner tests on the surface of the composites at high temperatures such as 1700 and 2000oC, and the weight change after burner tests are measured. The damages on the surface of C/C composite and SiC-coated composite are observed. As a result, the SiC coating is beneficial to protect the C/C composite from high temperature even though damages such as defoliation, crack and voids are observed during burner test at 2000oC. 본 논문에서는 탄화규소로 코팅된 탄소-탄소복합재료의 단열 특성을 고찰하였다. 탄소-탄소 복합재료 상에 탄화규소를 화학증착법(CVD)법으로 코팅하였다. 먼저 탄화규소로 코팅한 복합재와 코팅되지 않은 복합재에대해, 공기 중에서 1350oC의 온도를 급작스럽게 부가하였을 때의 단열특성을 서로 비교하는 연구를 수행하였다. 또한 본 연구에서는 최대 1700oC 및 2000oC의 온도에 복합재의 표면을 노출시키는 고온 버너실험을 수행하였다. 버너실험 전, 후의 무게를 측정하여 무게변화를 고찰하였다. 고온 버너실험 후 탄소-탄소 복합재 및 탄화규소로코팅된 복합재의 손상여부를 비교, 고찰하였다. 그 결과 2000oC의 온도에 노출 시 탄화규소 코팅재에서 박리, 균열, 공동 등의 결함손상들이 발견되었으나, 고온으로부터 탄소-탄소 복합재를 보호하는데 효과적이었다.
고지재생연구(제6보) -골판지 고지의 탈수성에 미치는 전분의 영향과 아밀라아제의 적용-
서형일,류정용,신종호,송봉근,오세균 한국펄프종이공학회 1999 펄프.종이기술 Vol.31 No.2
A great difference in drainage time was observed from the recycled stocks between corrugated container board and its component papers, liner and medium paper. It could be assumed that the different drainage property should be caused from a starch adhesive present in the corrugated board. Thus, three types of starch such as dried Stein-Hall adhesive, cooked starch solution, and its dried film were added to linerboard stock in order to investigate the mechanism of drainage reduction. The water-swollen starch particles derived from Stein-Hall adhesive were drastically deteriorated the drainage time, even though the amount of starch is very small (2% or below). The drainage time of OCC was improved by 25% when amylase was used a new biological treatment. The results from the lab and mill test showed that the starch-degradable enzymatic treatment improves the drainage property as well as the reduction of calcium hardness.