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윤승락(Seung-Lak Yoon) 한국펄프·종이공학회 2015 펄프.종이기술 Vol.47 No.6
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.
윤승락(Seung-Lak Yoon) 한국펄프·종이공학회 2017 펄프.종이技術 Vol.49 No.3
The shape, physical and strength properties of flyers of various sizes collected in each region were evaluated to assess which types of paper were used according to the sizes of leaflets distributed with newspapers. The flyers were mostly printed double-side and in color, and some of the smaller flyers were single-sided. The distribution range of physical properties was narrow in the leaflet (B5, A4 and 2 jeolji) and with in the other leaflets (B4, A3, 8 jeolji and 4 jeolji) were wide. The distribution range of the tensile strength was wide in A4, B4, 8 jeolji, 4 jeolji, and narrow in B5, A3, and 2 jeolji, respectively. Smaller and larger leaflets were produced with the same paper, and other leaflets were produced with various papers. The quality of leaflets in each region did not show any significant difference due to the limited number of paper types used for each flyer size.
윤승락 ( Seung Lak Yoon),小島 康夫 (Yasuo Kojima ) 한국목재공학회 1997 목재공학 Vol.25 No.2
This research has been examined to measure the degree of the fiber damage of ozonenation high yield pulp in the beating process. Ozone treated the TMP(Thermomechanical Pulp) acid CTMP(Chemithermomechanical Pulp) of spruce and the CTMP of birch has been beaten to be reached 200㎖(freeness) of its content. It had been studied the forming of fiber distribution by treatment for long fiber, short fiber. fine with the above method. As ozone treatment time gets longer, the pulp has showed the tendency of increasing the fiber content of 28, 48mesh. Ozone treated fiber has been increased long fiber content by being added softness. By given longer ozone treatment time, the TMP and CTMP of spruce has showed the decreasing of fiber content. On the contrary. CTMP of birch has showed the increasing its fiber content. It had proved that the results of difference are rather closer to the species of tree than closer to the kinds of pulp. The fiber content of over 200mesh which has created in beating process demonstrates the decreasing of its fiber content by getting longer ozone treatment time. The softness of fiber can be extracted by the lignin of fiber surface that had been formed by ozone treatment. Thus we assume that the fiber in the process of beating obtains less physical damage.