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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korea Technical Association of The Pulp and Paper Industry
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Journal DOI :
Korea Technical Association of the Pulp and Paper Industry
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Volume & Issues
Volume 46, Issue 6 - Dec 2014
Volume 46, Issue 5 - Oct 2014
Volume 46, Issue 4 - Aug 2014
Volume 46, Issue 3 - Jun 2014
Volume 46, Issue 2 - Apr 2014
Volume 46, Issue 1 - Feb 2014
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Computer Simulation for the Cavitation Changes at the Exit of Offset Printing Nip
Youn, Jong-Tae ; Kim, Yun-Taek ; Lim, Soo-Man ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 46, issue 3, 2014, Pages 1~10
DOI : 10.7584/ktappi.2014.46.3.001
Offset paper printing is a promising roll-to-roll technique for color printed materials. Although it is no doubt that understanding ink transfer mechanism in offset printing process is necessary to achieve high printing quality, investing the relationship between inks and substrates at the nip is difficult experimentally due to high printing speed. In this paper, rheological behavior and splitting point of the ink at the nip is studied using package software Ployflow and Flow 3D based on Navier-Stokes equation. Polydimethylsiloxane (PDMS) ink and IGT printability tester were used for an model ink and experiment to compare with that of simulation data, respectively. As a result, higher viscosity at state flow and pressure increased ink transfer due to higher possibility of presence of cavitation at the nip and increase in covering area ratio. These results have shown good agreements with experimental data compared by measuring density of print through.
Evaluation of Reliability of Automatic System for Measuring Sizing Degree by Basis Weight Variation of Paper
Lee, Ji-Young ; Kim, Chul-Hwan ; Lee, Ji-Young ; Nam, Hye-Gyeong ; Lee, Gyeong-Sun ; Jo, Hu-Seung ; Park, Hyung-Hun ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 46, issue 3, 2014, Pages 11~19
DOI : 10.7584/ktappi.2014.46.3.011
Reliability of the novel automatic system capable of measuring both St
ckigt sizing degree and contact angle at a time was evaluated through the calculation of its repeatability and reproducibility based on TAPPI Standard Method T 1200. As the basis weight of paper specimen increased, the repeatability and reproducibility of the automatic system became more improved than those from Hercules sizing test and contact angle test designated on TAPPI Standard Method T 530 and T 558. The more improved repeatability and reproducibility implies that a single tester can obtain the similar results under similar test conditions in spite of repetitive testing using the automatic system, and likewise that multiple testers can respectively reproduce similar data without big variation from the same paper specimen using the automatic system. In conclusion, this study is greatly meaningful in having developed the world's first automatic system to measure both St
ckigt sizing degree and contact angle simultaneously with excellent repeatability and reproducibility.
Evaluation of Brightness and Environmental Load by Hydrogen Peroxide Bleaching Conditions of TMP
Ahn, Chi-Deuk ; Seo, Jin-Ho ; Kim, Hyoung-Jin ; Chung, Sung-Hyun ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 46, issue 3, 2014, Pages 20~27
DOI : 10.7584/ktappi.2014.46.3.020
Nowadays, the bleaching techniques of thermomechanical pulp(TMP) are fast developing on the strength of some benefits, mainly on low production cost and good fiber property. In this study, the optimum concentration of bleaching chemicals and the environmental load of bleaching wastes were considered to improve the bleaching efficiency of thermomechanical pulp using Korean redpine(Pinus densiflora) under the peroxide-based bleaching system. The optical property of TMP after bleaching was planned to use higher grade of paper, like printing & writting paper, not general newspaper. The concentration of bleaching chemicals, NaOH,
and EDTA, in hydrogen peroxide bleaching system, on the basis of O.D. pulp was closely influenced on the improvement of TMP brightness. Final target of bleaching efficiency was set up to above 76%-ISO brightness. The optimal target brightness of Korean redpine TMP was reached to 76.45%-ISO under the conditions of
7% with NaOH 2.20%,
0.63% and EDTA 0.02%. The concentration of NaOH,
and EDTA was correlated functional to the residual peroxide content of wastewater, pH value and electric conductivity of TMP fibers after bleaching treatment. The optimal bleaching conditions by controlling the addition amount of chemicals were positively contributed to the brightness stabilization and environmental load of TMP.
Analysis of Paper Qualities and Forming Process at Varied Mixing Ratios of Different Kinds of Recovered Paper
Choi, Do-Chim ; Lee, Kwang Seob ; Kim, Chang Keun ; Cho, Byoung-Uk ; Ryu, Jeong-Yong ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 46, issue 3, 2014, Pages 28~36
DOI : 10.7584/ktappi.2014.46.3.028
The kind and the mixing ratio of recovered papers would affect the quality of final recycled paper. In this study, effects of the mixing ratio of various domestic recycled papers (old news print (ONP), old corrugated container (OCC) and coated paper (CP)) on variations in physical properties of paper and its productivity were investigated. When the mixing ratio of CP grade increased, the freeness (CSF) of recycled pulp was increased while paper strength and white water turbidity was decreased. Paper strength was decreased as the percentage of OCC was higher than ONP. When ONP was mixed with OCC, no adverse effect was observed except the increased drainage resistance. It is expected that these results could be utilized as fundamental data to establish regulations for the recovered paper grades according to mixing ratios of different kinds of them.
Analysis of secondary reactions in concentrated sulfuric acid hydrolysis of hollocellulose by
Lee, Jai-Sung ; Shin, Soo-Jeong ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 46, issue 3, 2014, Pages 37~43
DOI : 10.7584/ktappi.2014.46.3.037
Kinetics of holocellulose hydrolysis in concentrated sulfuric acid was analyzed using
-NMR spectroscopy with different reaction time, temperature and acid concentration in secondary hydrolysis. In this work, reaction condition of secondary hydrolysis was similar to concentrated sulfuric acid process with electrodialysis or simulated moving bed chromatography process for sulfuric acid recycling. By
-NMR spectroscopy, acid hydrolyzates from higher secondary acid hydrolysis (25-35% acid concentration) was successfully analyzed without any difficulties in neutralization or adsorption of acid hydrolyzate to solid salt. Higher acid concentration, higher temperature and longer reaction time led to more cellulose for glucose conversion but accompanied with glucose to galactose isomerization, glucose to unknown compounds and degradation of glucose to organic acid via furans.
Comparison of enzymatic hydrolysis characteristics of mushroom culutured waste (MCW) and Cork oak by alkali treatment
Yoon, Su-Young ; Seung, Hyun-A ; Shin, Soo-Jeong ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 46, issue 3, 2014, Pages 44~49
DOI : 10.7584/ktappi.2014.46.3.044
The mushroom cultured waste(MCW) from cork oak was evaluated as the raw material for bioethanol production. For enzymatic hydrolysis, cellulase cocktails (Celluclast 1.5L and Novozym 188) was used for polysaccharides to monosaccharides conversion. Compared with sound cork oak woodmeal, woodmeal from MCW showed higher cellulose to glucose conversion. To improve polysaccharides to monosaccharides conversion, pretreatment by sodium hydroxide was applied. Even though more xylan and lignin were removed in woodmeal of MCW than that of cork oak, concentration of glucose was higher from sodium hydroxide treated cork oak woodmeal (51.3 g/L) than treated MCW woodmeal (41.6 g/L).
Evaluation of the Physical Properties of Kraft Pulps Made from Major Agricultural Byproducts
Lee, Ji-Young ; Lim, Gi-Baek ; Kim, Sun-Young ; Park, Jong-Hea ; Kim, Chul-Hwan ; Hur, Young-Jun ; Kim, Young-Hoon ; Kim, Yeon-Oh ; Lee, Se-Ran ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 46, issue 3, 2014, Pages 50~57
DOI : 10.7584/ktappi.2014.46.3.050
In this study, we investigated the physical properties of kraft pulps made from rice husk, peanut husk and garlic stems. These agricultural byproducts were collected individually, and then various pulps were manufactured from them by controlling active alkali, sulfidity, reaction time and the liquor ratio in the kraft pulping process in order to analyze the applicability of these agricultural byproducts as raw materials for kraft pulps. After kraft pulping, we measured yield, flake content, fiber length, fiber width and freeness of pulps, and the fiber shapes of the pulps were observed by using an optical microscope. When the higher active alkali, longer reaction time and lower liquor ratio were applied in kraft pulping process, reject content decreased and fiber yield increased. The pulp from garlic stems had the longest fiber length and that from rice husk showed the highest intial freeness. All of the pulps from agricultural byproducts showed higher initial freeness, shorter fiber length and the similar fiber width compared to OCC, BCTMP and hardwood BKP. The fibers of the pulps made from agricultural byproducts showed a similar shape to those of commercial pulps. It was concluded that these agricultural byproducts had a potential as raw materials to produce an alternative pulp to the commercial pulps.
Evaluation of the properties and the papermaking applicability of the residue originated from the anaerobic digestion of livestock manure
Kim, Seung Min ; Jung, Woong-Gi ; Sung, Yong Joo ; Ahn, Hee-Kwon ; Kim, Dong Sung ; Yoon, Do-Hyun ; Kim, Dong-Seop ; Jung, Hwa Gwang ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 46, issue 3, 2014, Pages 58~64
DOI : 10.7584/ktappi.2014.46.3.058
Management of organic waste such as livestock manure has been considered as very important issue in terms of the environment. The anaerobic digestion of livestock manure become more attractive treatment method and has been widely applied. In this work, the properties of the residue after the anaerobic digestion of livestock manure was evaluated for providing the basic data to develop new application. The lignin and the ash contents of the residue were much higher than those of other biomass such as wood. The components of the residue were also analyzed with SEM-EDS and Elemental Analyzer. The addition of the residue into the handsheet paper resulted in the higher bulk and he higher air permeability with the loss of the strength properties. The water holding capacity of the handsheet were increased until the 40 % addition of the residue.
Changes in Fiber Characteristics by Low Concentration Sodium Hydroxide Swelling and Beating
Kim, Ah-Ram ; Choi, Kyoung-Hwa ; Cho, Byoung-Uk ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 46, issue 3, 2014, Pages 65~72
DOI : 10.7584/ktappi.2014.46.3.065
In this study, effects of alkali swelling at low concentration below 2 percent on properties of hardwood bleached kraft pulp (HwBKP) were elucidated. Swelling treatment of HwBKP was performed at various NaOH concentrations with/without beating. Then, the swelling characteristics of pulp fiber was evaluated by measuring the solvent retention values such as water retention value (WRV) and isopropyl alcohol retention value (LRV). It was found that fiber characteristics were influenced by NaOH swelling even at low alkali concentration and beating treatment as well. The values of WRV and LRV were decreased when the alkali concentration was increased. It is the result from the decreased acidic groups of pulp which were formed during beating. The acidic groups could be neutralized and then removed by alkali. The difference between WRV and LRV was decreased with increasing alkali concentration while the difference was increased when the alkali swollen pulp was beaten. In addition, the crystalline structure of HwBKP was almost not changed while the crystallinity was influenced by swelling treatment at a low alkali concentration.
Studies on the influence of the chemical types of insolubilizers on coated paper properties
Kim, Sun Goo ; Kim, Du Hyuen ; Won, Jong Myoung ; Lee, Yong Kyu ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 46, issue 3, 2014, Pages 73~80
DOI : 10.7584/ktappi.2014.46.3.073
In this study, in order to investigate the influence of insolubilizer on the double coating structure, we carried out basic research related to the double coating formulation with four insolubilizers having various chemical types such as amino aldehyde, glyoxal and two metallic salts. It was found that although the four insolubilizers showed similar results on optical and surface properties of the coated papers, they gave different results in the printabilities of the coated papers since coating structure was significantly influenced by different reacting mechanism of the insolubilizers. Three of the insolubilizers (glyoxal, two metallic salts) showed better results than amino aldehyde type one when they were applied to top coating formulation. Metallic salts type insolubilizers showed good results in the print gloss when it was applied to top coating formulation. It was believed that amino aldehyde type insolubilizer applied top coating formulation showed good both of dry-pick and wet-pick strength.
Changes of Handsheet Fracture Toughness by Wood and Cotton Fibers Mixing
Kim, Jeong-Jung ; Jang, Dong-Uk ; Yoon, Sang-Gu ; Shin, Hyeon-Sik ; Park, Jong-Moon ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 46, issue 3, 2014, Pages 81~87
DOI : 10.7584/ktappi.2014.46.3.081
Conditions of paper manufacturing process should be changed depending on the end use and paper properties. Most of the case, mixed pulps with long softwood fibers and short hardwood fibers are used to achieve proper qualities of product with reasonable production cost. For specialty paper manufacture the wood pulp and cotton linter pulp are usually mixed together. The objectives of this study is to analyze physical, mechanical and fracture mechanical properties of paper depending on SwBKP, HwBKP and cotton linter pulp(CLP) mixing. When the mixing ratio of SwBKP was increased, strength properties, such as tensile, tear, and folding endurance, were also increased. When the mixing ratio of SwBKP and HwBKP was increased, stress concentration index was decreased and fracture toughness was increased.