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펄프 고해과정중 발생되는 미세섬유의 구조(II) : 활엽수 펄프 Hardwood pulp
윤승락,김재경,김사익,조종수,노정관 진주산업대학교 2000 산업과학기술연구소보 Vol.- No.7
Freeness occurrence and types of deciduous fine fibers depending on beating time were examined to evaluate morphological characteristics of fine fibers produced by beating of Kraft pulp(KP) processes. The results were as foltows; As the beating time was increased, freeness and occurrence of fine fibers were gradually increased. The fibrillation of fiber was started at 20 minutes(22˚ SR) after beating, and the cell wall was destroyed or cut after 70 minutes(67˚ SR). Fine fibers produced during beating were composed of microfibrils from wood fibers, fragments caused by vessel destruction, and parenchyma cells. At initial stage of beating, the primary and secondary walls of fine fibers were coexisted, but as the beating was more processed, fine fibers which were composed of secondary wall were increased, indicating of destruction of secondary cell wall. The morphological change of parenchyma cell was not occurred by beating.
신문에 끼워진 상업용 전단지의 특성 (제2보) - 발행업종별 전단지의 물리 및 강도적 성질 -
윤승락 한국펄프·종이공학회 2015 펄프.종이技術 Vol.45 No.3
This research was performed to investigate the quality of leaflets provided with newspapers. The leaflets were classified according to business types and regions. The physical and strength properties were analyzed. The sizes of leaflets were 2, 4, 8 jeoljis of crown octavo, A3, A4, A5, and B3, B4, B5. Most of them were color printed and both-sides printing was much more popular than one-side printing. The leaflets about electronics, educations, and clothing showed lower density than restaurant business and other areas. The leaflets of electronics, educations, and clothing, and large stores showed lower tensile strength, and those of restaurant businesses and building trades showed relatively high tensile strengths. No differences on the quality of leaflets except for large stores were found according to business areas. Large markets made the leaflets with various types of papers, and low quality papers were also included.
윤승락 한국펄프·종이공학회 2015 펄프.종이技術 Vol.38 No.1
To investigate fiber orientation of Korean traditional paper, Hanji, the fiber arrangements on the surface and cross section of Hanji were observed by scanning electron microscope (SEM). The surface observation showed that the fibers of traditional paper were arranged in vertical and horizontal directions, and those of ssangbal sheet forming were arranged more in vertical direction. The fibers of machine made Hanji and copying paper were usually arranged in vertical direction. As for the observation of cross section of traditional paper, fibers arranged in horizontal direction tended to be increased with the increase of thicknesses. The thick traditional paper have cracks in the middle part of structural section of paper. They were larger in cross section in horizontal direction than in vertical direction. The horizontal arrangement of traditional paper seemed to be about 8% to 14% higher to the vertical arrangement, which is very lower to other papers.