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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
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Volume & Issues
Volume 39, Issue 5 - Dec 2007
Volume 39, Issue 4 - Dec 2007
Volume 39, Issue 3 - Sep 2007
Volume 39, Issue 2 - Jun 2007
Volume 39, Issue 1 - Mar 2007
Selecting the target year
The Effect of Consistency and Crowding Number on the Formation of Paper Made of Different Pulp Stocks
Lee, Hak-Lae ; Youn, Hye-Jung ; Lee, Sang-Gil ; Jeong, Young-Bin ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 39, issue 5, 2007, Pages 1~6
Formation which is one of the most fundamental characteristic of paper quality is affected by a number of variables. Fiber flocculation in the headbox has been recognized as the most important variable influencing formation. Consistency and crowding number of head box stock are known to represent the flocculation potential of stocks. The effects of consistency and crowding number on paper formation were studied by measuring the flocculation of fiber suspensions. Increasing consistency increased the degree of fiber flocculation. Especially the consistency of long fiber fraction was the most crucial factor of flocculation. Tensile strength of handsheets was furnish dependent rather than flocculation dependent. Crowding number of a furnish can be used for the characterization of stock flocculation.
Delignification Kinetics of Trema orientalis (Nalita) in Kraft Pulping
Jahan, M. Sarwar ; Rubaiyat, A. ; Sabina, R. ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 39, issue 5, 2007, Pages 7~11
Kraft pulping of Trema orientalis (Nalita) was studied in order to find kinetic data for delignification. Pulping runs were carried out in the temperature range of
under constant and well-defined conditions. The delignification was found to be first order with respect to residual lignin and was chemically controlled. The rate of delignification reaction was increased 1.11-1.23 for
temperature increase in the range of
range. A mean value of 93% of lignin was removed at the transition between bulk and residual delignification. The influence of cooking temperature on the rate constant was expressed by an Arrhenius-type equation. The obtained activation energy of the delignification reaction was 6,164 cal/mol. The transition point between bulk and residual phase was shifted to lower lignin and carbohydrate yield with the increase of temperature.
Deinking of Electrostatic Wastepaper with Cellulolytic Enzymes and Surfactant in Neutral pH
Eom, Tae-Jin ; Kim, Kang-Jae ; Yoon, Kyoung-Dong ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 39, issue 5, 2007, Pages 12~19
Enzymatic deinking method can avoids the alkaline environment as usual required in chemical deinking, which consequently cuts chemical costs and reduced the white water pollution. The electrostatic wastepaper was dinked with commercial cellulolytic enzymes and surfactant in neutral pH and the effectiveness of deinking and the physical properties of deinked pulp were evaluated. The disintegrating efficiency of the electrostatic wastepaper in neutral pH was enhanced with enzyme treatments. Although the freeness of deinked pulp with enzymes was higher than that of deinked pulp with chemical de inking agents, the brightness of the enzymatic deinked pulp was slightly lower than that of the chemical deinked pulp. But, by additions of nonionic surfactants, the brightness of deinked pulp was increased with less residual ink particles and mechanical properties of enzymatic deinked pulp was improved compared to the deinked pulp of conventional alkaline method.
Degardatrion of Cellulosic Fibers by Electron Beam Irradiation
Han, Sung-Ok ; Seo, Yung-Bum ; Lee, Chun-Han ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 39, issue 5, 2007, Pages 20~25
Henequen fibers were treated by electron beam irradiation and by NaOH to make surface modification for better bonding in the manufacture of biocomposite. Impurity removal and carbonyl group formation were noticed in the previous study by electron beam irradiation, but extensive cellulose degradation were also noticed. To evaluate the effects of electron beam irradiation on cellulosic fibers further, henequen fibers, cotton pulp, cotton fibers, and cellophane were irradiated by electron beam, and their changes of cellulose viscosity, chemical composition, and tensile strength were measured and analyzed.
Difference of Calendering and Dochim Effects on Paper Surface Properties
Seo, Yung-Bum ; Jun, Yang ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 39, issue 5, 2007, Pages 26~31
Hanji is a traditional Korean handmade paper, which has been known in ancient Far East as excellent quality calligraphic paper for more than 1,500 year. Hanji is mostly made of Korean paper mulberry bast fibers, and if properly processed, normally lasts for more than 1,000 years with significant strength and still recognizable calligraphic writings or drawings on it. Dochim is a special way of Hanji calendering process, but is turned out to be quite different from modern calendering (machine calendering) in several aspects. In Dochim process, mechanical impacts were applied vertically to the surface of papers. Compared to the modern calendering, Dochim increased paper gloss much more, but paper smoothness a little less. By the Dochim process, densification occurred and the degree of densification was more sensitive to the fiber type in the Dochim process than in the calendering method.
Causes of Wrinkle in Silky Wallpaper and Its Solution
Won, Jong-Myoung ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 39, issue 5, 2007, Pages 32~38
The purpose of this study is to investigate the cause of fine wrinkles occurred in silky wallpaper and its solution. The characteristics of base papers, wallpapers and adhesives (conventional and modified) were evaluated to find the possibility for the occurrence of fine wrinkles. It was found that the base papers and wallpapers did not cause the occurrence of silky wallpaper. It was concluded that the fine wrinkles in silky wallpaper was caused by the nonuniform distribution of adhesive, the localized shrinkage of adhesive and the breaking the balance between the resistance of wallpaper and shrinkage of adhesive. Three possible solutions for the prevention of the occurrence of fine wrinkles in silky paper were recommended.
Optimization of Repulping Process of Unsorted ONP for Pulp Mold (II) - Pilot trial -
Cho, Byoung-Uk ; Ryu, Jeong-Yong ; Fabry, Benjamin ; Song, Bong-Keun ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 39, issue 5, 2007, Pages 39~44
In order to utilize unsorted ONP, which contains leaflets (printed coated papers), as a raw material to produce pulp mold, optimum conditions for repulping were investigated with the pilot Helico pulper at Centre Technique du Paper (CTP), France. Two major process factors were focused: repulping concentration and rotor speed. Repulping at a higher concentration showed more rapid defibering kinetics. Increasing the rotational speed of rotor at the optimum repulping concentration accelerated the defibering kinetics while it also led to higher fines generation and faster decrease in drainage property of the produced pulp. Hence, an alternative way was suggested: starting repulping at a conventional rotor speed and then accelerating the rotor speed for the last minute(s) of repulping.
Quantitative Analysis of Heavy Metals in Packaging Papers
Jo, Byoung-Muk ; Jeong, Myung-Joon ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 39, issue 5, 2007, Pages 45~51
This study was carried out to investigate various heavy metal contents in packaging papers by pre-treatments for ICP-ES (Inductively Coupled Plasma Emission Spectrometry) analysis. Pre-treatment methods of heavy metals in this study include extraction, migration and decomposition methods (dry ashing,
). Test results were compared with conventional extraction (water) and migration (3% acetic acid) methods. The five representative heavy metals (Cd, As, Pb, Cr and Hg) were analyzed. For Cd, Hg, and As, the results were below detection limit of the instrumental technique. It was considered that the migration test was a better method compared to extraction test, but all the decomposition methods showed much higher detection values than the extraction or migration test. In case of recycled corrugated containers, 3% acetic acid solution extracted about 25% of chromium and 30% of lead compared to the content by decomposition methods. Among all decomposition methods, the nitric acid - perchloric acid - hydrofluoric acid treatment brought a slightly higher detection value than others, but there was no significant difference among them except sulfuric acid - nitric acid method.
Evaluation of Edgewise Compressive Strength of Corrugated Fiberboard with Microflute
Youn, Hye-Jung ; Lee, Hak-Lae ; Kim, Ji-Yong ; Kwon, Hyun-Seung ; Chin, Seong-Min ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 39, issue 5, 2007, Pages 52~57
Corrugated fiberboard is a representative packaging material because of high compressive strength and stiffness in spite of light weight. The flutes of corrugated fiberboard are various depending on the height and the number per unit length of flute. The corrugated fiberboard with microflute like E, F or G with low height less than 1.5 mm has developed. Because it has some advantages including higher stiffness and lower requirement of fiber than carton board, it has a possibility to replace folding box board. Its consumption has been increased with the various applications like graphic packaging. As microflute has the different geometry from other conventional flutes, it can show the different behavior in testing and it may require a new testing method. In this study, we evaluated the edgewise compressive strength of the corrugated fiberboard with microflute according to ISO and other standard test methods. And the effect of specimen shape and platen compression rate was examined. From this study, we found that ISO methods was suitable and reasonable methods for corrugated fiberboard with microflute.
Using NIR Spectrometry for Direct Control of Recovered Papers
Borel, Pascal ; Sabater, Jacques ; Tourtollet, Guy Eymin Petot ; Cochaux, Alain ; Veiga, Joseph ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 39, issue 5, 2007, Pages 58~63
This paper sums up all the different steps broached in this project : The NIR spectroscopy technique has been studied and implemented at CTP using a mobile spectrometer device and different optical materials. Methods, based on statistical data analysis (in particular PLS regressions), have been investigated. A laboratory "prototype" using these techniques and methods has been developed in order to control the recovered papers quality, in terms of humidity percentage and sample composition (paper, board, contaminants).