Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Korea Technical Association of The Pulp and Paper Industry
Journal Basic Information
Journal DOI :
Korea Technical Association of the Pulp and Paper Industry
Editor in Chief :
Volume & Issues
Volume 34, Issue 5 - Dec 2002
Volume 34, Issue 4 - Dec 2002
Volume 34, Issue 3 - Oct 2002
Volume 34, Issue 2 - Jun 2002
Volume 34, Issue 1 - Apr 2002
Selecting the target year
Influence of the Surface Energetics on flotation Process - Importance of the Surface Energy and Polarity of Solid Particles in Flotation Efficiency -
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 34, issue 3, 2002, Pages 1~8
The object of this study was to determine the surface energy of hydrophobically modified micro-crystalline cellulose (MCC) with AKD and evaluate the effect of surface energy of the solid particles dispersed in aqueous medium on flotation efficiency. Especially to eliminate the complication derives from the diverse parameters of solid particles including particle size, type, etc. MCC's modified with AKD have been used. The surface energy Parameters were calculated from advancing contact angles of apolar and polar liquids on MCC pellets using the Lifshitz-van der Waals acid-base (LW:AB) approach. Total surface energy of hydrophobic MCC ranged from 46.19 mN/m to 48.60 mN/m. The contribution of the acid-base components to the total surface energy ranged form 13% to 17% for hydrophobic MCC's. The effect of surface characteristics on the flotation efficiency was evaluated. It was shown that there exist critical values of surface energies to increase flotation efficiency. Total surface energy and polar component of solid particles should be lower than 47 mN/m and 7 mN/m, respectively, for effective removal in the flotation process.
Surface Characterization of Hydrophobically Modified MCC Using Inverse Gas Chromatography
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 34, issue 3, 2002, Pages 9~16
The adsorption characteristics and surface energetics of hydrophobically modified MCC have been investigated by the inverse gas chromatography technique at infinite dilution. The thermodynamic parameters of adsorption, ΔG, ΔH and ΔS, for n-alkanes were determined at infinite dilution. Heats of adsoption of the n-alkanes increased as the level of hydrophobic modification increased. The hydrophobically modified MCC also showed greater entropy of adsorption indicating restricted mobility of the adsorbed n-alkanes. The acid/base characteristics of the MCC were evaluated using polar probes. As the hydrophobicity of MCC increased, the basisity of the MCC decreased.
Molecular Diffusion of Water in Paper (IV) - Mathematical model and fiber-phase moisture diffusivities for unsteady-state moisture diffusion through paper substrates -
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 34, issue 3, 2002, Pages 17~24
An unsteady-state moisture diffusion through cellulosic fibers in paper was characterized from the moisture sorption experiment and the mathematical modeling. The sorption experiment was conducted by exposing thin dry paper specimens to a constant temperature-humidity environment. Oven dried blotting papers and filter papers were used as test samples and the gains of their weights were constantly monitored and recorded as a function of sorption time. For a mathematical approach, the moisture transport was assumed to be an one-dimensional diffusion in thickness direction through the geometrically symmetric structure of paper. The model was asymptotically simplified with a short-term approximation. It gave us a new insight into the moisture uptake phenomena as a function of square root of sorption time. The fiber-phase moisture diffusivities(FPMD) of paper samples were then determined by correlating the experimental data with the unsteady-state diffusion model obtained. Their values were found to be on the order of magnitude of
/min., which were equivalent to the hypothetical effective diffusion coefficients at the limit of zero porosity. The moisture sorption curve predicted from the model fairly agreed with that obtained from the experiment at some limited initial stages of the moisture uptake process. The FPMD value of paper significantly varied depending upon the current moisture content of paper. The mean FPMD was about 0.7-0.8 times as large as the short-term approximated FPMD.
Analysis of Printed Image Depending on Mixing Ratios of Softwood and Hardwood fibers Using Image Analyzer and CLSM
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 34, issue 3, 2002, Pages 25~31
The purpose of this study was to analyze how the fiber properties and mixing ratio of softwood and hardwood pulp affect on roundness of printed image. Softwood pulp and hardwood pulp were refined to 400 and 600ml CSF by Valley beater and handsheets of 70 g/
basis weight were made at different mixing ratios of hardwood and softwood pulp. The roundness, dot area, and shape of the printed dot were measured by Image Analyzer. The depths and shapes of the acridine orange penetration into paper were measured by CLSM. With higher mixing ratio of hardwood pulp, the paper showed higher air-permeability and better formation, especially at lower freeness. The roundness of the printed image became better and the dot size became smaller when the amount of hardwood pulp increased. Penetration depth of acridine orange by CLSM became greater and roundness increased to real circle when the amount of hardwood pulp increased. It was thought that higher mixing ratio of hardwood fibers resulted in efficient penetration by better formation with uniform micro-pore distribution and it increased roundness. It was thought that fiber properties and mixing ratio affected the structure of paper and the shape of the printed dot. This study showed that the measurement of depth of the liquid penetration into paper without destruction and contact was feasible. Moreover, this method showed that the shape of the liquid penetration was measurable.
Studies on the Application of Microorganism to Control the Bulking of Paper Mill Wastewater
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 34, issue 3, 2002, Pages 32~37
The paper mill wastewater actually generating bulking was used to apply to the spot. Batch and continuous type pilots were used in this study. Optimal time after propagating generation of activated sludge in aeration basin by adding Hoc forming microorganism was 24 and 36hours while optimal time of activated sludge in original aeration basin was 60hours. Showing the difference of sedimentation velocity at 7th day after operating a pilot continuously, SV30 was decreased to 50% at 13th day. COD value in aeration basin with floe forming microorganism was 35mg/L while COD value in original aeration basin was 52mg/L. It was indicated that application of Hoc forming microorganism can control the bulking of paper mill wastewater by shortening of recovery time and improving of pollution removal efficiency.
Sequential Oxidative and Reductive Bleaching of MOW by the Addition of Thiourea
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 34, issue 3, 2002, Pages 38~45
The effect of sequential oxidative-reductive bleaching on brightening of the MOWs is investigated. The improvement in brightnesses of MOWs is more effective in conventional PFAS bleaching than in P/T bleaching. There is no difference in the mechanical properties or the bleached pulps between PFAS and P/T sequences. Considering the brightness gains and bleaching chemicals cost, for the MOW A(Initial brightness: 68.3% ISO) containing 5％ ONP and 20% colored paper, the P/T bleaching is more economical than the PFAS bleaching. However for MOW B(initial brightness: 59.1％ ISO) containing 15% ONP and 35％ colored paper, there is no difference in the bleaching efficiency between PFAS and P/T bleaching.
EoP Bleaching of Mixed Office Wastepaper
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 34, issue 3, 2002, Pages 46~52
To produce the raw material used for printing and writing paper or high quality tissue, MOWs that were consisted of white ledger, colored ledger and old newspaper were bleached with EoP and EoPY(FAS) method, the EoP bleaching process gave the improvement in brightness and a high color removal efficiency. Especially, MOW B(initial brightness: 59.1％ ISO) that contained much old newspaper showed the higher bleaching efficiency than those of MOW A(initial brightness: 68.3%). After EoPY(FAS) bleaching, MOW's brightness was increased from 68.3% ISO to 84.3∼84.0% ISO, and from 59.1% ISO to 78.7∼79.2% ISO, respectively. Also the tensile and burst index of bleached pulps decreased by 10∼30%. The tear index slightly decreased or halted at the same range as unbleached pulps.
Investigation on Relationship Between Pore Structure of Coating Layer and Ink Residual Behavior - Focused on the Effect of Pigments and Inks -
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 34, issue 3, 2002, Pages 53~58
This paper was performed to investigate the effect of pore structure on ink residual behavior. To prepare different coating structures as substrates against inks, fine, medium and coarse calcium carbonate were used in the coating color. It is well known ink properties can affect to print qualities. After printing on the coated paper, ink layer can consider as third structure addition to paper and coating layer. To compare effect of ink properties on the surface structure and print qualities, several properties of ink were also adopted as raw material. Particle size of pigment effect on gloss evaluation of coated paper increased with calendering. It was shown that ink transfer rate increased as surface of the sample was smooth. The ink contained low viscosity resin evaluated more print gloss. Finer pigment particle size, smaller pore size and higher porosity. Pore volume of coated paper was slightly decreased with printing as the coating was prepared with the finest particle size. However, it founded that ink resin could not affect on pore volume and distribution of printed paper
도공개론 및 도공지 시장의 최근동향
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 34, issue 3, 2002, Pages 59~81
잉크 제트 도공층의 흡수특성과 인쇄품질
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 34, issue 3, 2002, Pages 82~95