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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
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
Quantitative Characterization of Internal Fibrillation of Pulp Fiber
Won, Jong-Myoung ; Lee, Jae-Hun ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 39, issue 1, 2007, Pages 1~7
Internal fibrillation of pulp fiber is an important factor affecting paper properties. Internal fibrillation of pulp fiber is usually introduced with several kinds of modifications of fiber by the mechanical treatment such as refining, high shear and/or high consistency mixing, etc. Unfortunately there are no standardized methods that can characterize the extent of internal fibrillation and its contribution on the paper properties. The purpose of this study is to try and find the potential methods that can characterize the internal fibrillation of pulp fiber quantitatively. Softwood bleached kraft pulp was treated with Hobart mixer to introduce the internal fibrillation without the significant fiber damage and external fibrillation. The extent of internal fibrillation was increased with the increase of mechanical treatment consistency. Several fiber properties were measured to find the potential means that could characterize and quantity the internal fibrillation. Laminated area could not be used as a means for quantifying the internal fibrillation because of the effect of swelling and the different internal fibrillation behavior at different mechanical treatment consistency. Micro and macro internal fibrillation models were proposed for describing the different behavior for the mechanical treatment at low and high consistencies of pulp. The Internal fibrillation showed good correlation with swelling of fiber wall. This trend was confirmed through the measurement of wall thickness and/or cross section area of fiber. Therefore the internal fibrillation possibly can be described as the indices indicating the change of wall thickness and/or cross section area.
Dynamic Simulation of Retention and Formation Processes of a Pilot Paper Machine
Cho, Byoung-Uk ; Garnier, Gil ; Perrier, Michel ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 39, issue 1, 2007, Pages 8~15
In an effort to develop control strategies for the wet-end of paper machines, dynamic models for retention and formation processes have been developed. The retention process, including headbox total and filler consistencies, white water total and filler consistencies, the basis weight and the ash content of paper, can be modeled from first-principles (mass balances). To include the effect of wet-end chemistry variables, first-pass retention was included as a parameter dependent on operating conditions. In addition, dynamics of formation was simulated by developing an empirical model of formation and coupling with the dynamic models for the retention process. A series of experiments were performed using a pilot paper machine. The experimental results and the model predictions showed relatively good agreement.
Behavior of AKD in AKD-sized Paper by Heating Treatment During Ageing
Shin, Young-Doo ; Seo, Won-Sung ; Cho, Nam-Seok ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 39, issue 1, 2007, Pages 16~24
This study was performed to investigate the reaction between alkylketene dimer(AKD) and cellulose molecules in AKD-sized paper sheet. AKD was added to highly beaten(
) SwBKP(ca. 0.8% on pulp) in order to have much AKD retention in the paper sheet. This AKD-sized paper sheet was aged at different temperatures,
. Changes in FT-IR spectra of AKD in paper sheet during the ageing were measured. In addition, sizing degrees of the AKD-sized paper sheet pretreated for 30 sec. at
were measured by HST size tester during the storage at different temperature. IR spectra of AKD-sized paper sheet preheated at
for 30 sec. showed unchanged spectra two absorption bands at
which refer to the typical AKD IR bands. However, these typical AKD bands were gradually reduced with increasing ageing, completely disappeared after 6 hrs. and formed new absorption band at
, which refers to carbonyl stretching vibration of dialkylktone. Eventually the AKD molecule was hydrolyzed to diakylketone without formation of
-ketoester with cellulose in paper sheet. After 6 days ageing, a little amount of
-ketoester bands was identified in 6 or 7 days ageing, because of the absence of water due to long-term heating. The same tendency was observed at different ageing conditions. At the practical papermaking process, AKD reacts prevailing with water, and mostly seems to be hydrolyzed to dialkylketene. Concerned to the sizing development, AKD-sized paper sheet was shown no sizing development at the initial stage of ageing at
after heating treatment at
for 30 sec., and gradually increased the sizing degree with increasing ageing, such as Hercules Sizing Tester (HST) 130 see for 12 hr, HST 300 sec. for 3 days and HST 400 sec. for 5 days. It was concluded that hydrolyzed AKD could contributed to the sizing development of the paper sheet.
The Study of Print Mottle related to the Properties of Coated Paper and Ink Dispersion(II) - Analysis of trial printing -
Ha, Young-Baeck ; Lee, Yong-Kyu ; Kim, Chang-Keun ; Oh, Sung-Sang ; Lim, Jong-Hag ; Youn, Jong-Tae ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 39, issue 1, 2007, Pages 25~29
Print mottle is the spotty and cloudy appearance of the ink on the substrate. Print mottle is influenced significantly by the characteristics of the paper with regard to homogeneity of its structure and its coating. The print mottle can be counteracted, in particular by altering the absorption characteristics of the inks, by changing sequence in which the inks are printed, or by using a advanced coated paper. In this study, we investigated the effect of ink dispersion to the print mottle through trial printing test and also analyzed the correlation between properties of coated paper and subjective results by statistic method. The result of this study is expected to be applied the basic data to solve the problem of printing mottle.
Development of multipurpose seed paper from waste paper(II) - Focused on field test of manufactured seed paper -
Eom, Tae-Jin ; Park, Soung-Bae ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 39, issue 1, 2007, Pages 30~37
The seed paper was used in farm field recently for a sound young plant. The most of seed paper are made of synthetic non-woven sheet. Therefore, it is very difficult to bio-degrade in soil and is very hard to have some special function, for example keeping herbicide and/or insecticide activity because of its lack of chemical acceptability. The purpose of this research is manufacture of seedling paper which have a function of herbicide activity from waste paper. The fiber properties from waste paper were remarkably improved by fine removal with washing and/or flotation process. The paper-making ability for seed paper was enhanced with enzyme treatment of secondary fibers. The paper for seedling must have a good bio-degradation ability in soils. The absorption amount of chemical like as dithiopyr was increased remarkably in enzyme treated base paper. The embossing treatment of base paper was very effective for seed attachment and chemicals retention. And also, the developed seed paper showed a good penetration property of young root through embossed paper.
Development of Functional Hanji Added Citrus Peel(I) - Hanji added Korean citrus peel -
Kim, Hae-Gong ; Lim, Hyun-A ; Kim, So-Young ; Kang, Sool-Saeng ; Lee, Hyo-Yeon ; Yun, Pil-Yong ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 39, issue 1, 2007, Pages 38~47
This study was carried out to develop a new application field and obtain the basic data of citrus peel as waste in Jeju island and traditional Hanji for producing functional Hanji. The results measuring physical and optical properties, water vapor permeance and antibacterial activity are as follows. It was revealed that apparent density go as down but bulk raise up in the structural view of Hanji with increasing of the addition various Korean citrus peel (citrus unshiu, cheonggyun and hanrabong peel, and citrus unshiu peel powder) percentages, and that the density of Hanji added citrus unshiu peel was higher, but bulk was lower in compared with Hanji added other kinds of peel. Those Hanji added citrus unshiu peel, cheonggyun peel, hanrabong peel and citrus unshiu powder were very great not only in the strength (breaking length, burst index, tear index and folding endurance) but also in water vapor permeant rate in comparison with Hanji. The pHs of Hanji were neutrality (7 to 8). The brightness of the Hanji added various citrus peel percentages was low in compared to Hanji, and the 40% addition of hanrabong peel was the lowest. When 40% hanrabong peel was added to Hanji, it was very yellow in the color degree. When cheonggyun peel was added to Hanji manufacture, water vapor permeant rate was highly effective. It is known that vacant space of intrafiber was reduced by image analysis of Hanji and the additions of peel of citrus unshiu, cheonggyun and hanrabong were distributed equally in the interior of Hanji. The antibacterial activity of Hanji added citrus unshiu peel is more than 98%. After all, it would be able to increase utilization of Hanji, extensively. Namely, production of high quality Hanji added functional materials is expected for new valuable industry of citrus peel and Hanji.
A Quality Comparison of Traditional Korean Papers: Mixtures of Bast-Fiber with Straw pulp(Rice straw paper) in Different Composition Ratio
Jung, Sun-Young ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 39, issue 1, 2007, Pages 48~55
The aim of this article is to review the general property of the famous traditional Korean paper, "rice straw paper"(Bast-Fiber mixed with straw pulp), and to compare the paper qualities varying with the composition ratio of straw pulp, in order to revive the traditional paper in modem Korea. The experiment was carried out by making first the two different mixture papers, i. e., one is the paper of 50% bast fiber mixed with 50% straw pulp, and the other is the paper of 75% bast fiber with 25% oats straw pulp, and finally the 100% bast fiber paper was made for the purpose of comparison. The qualitative properties of these three kinds of paper with the different mixing ratio of the straw pulp were evaluated, and the findings of the experiment can be summarized as follow: 1. As to the quality aspects of the paper strength like tensile strength, breaking length, elongation, and tear strength, the test proved the 100% bast fiber paper as best, and the 50% mixed paper as the next good one. 2. In aspect of the printing adaptability such as density, opacity, brightness, whiteness, lab colors, air permeability, and roughness, the 50% mixed paper proved to be the best, due to the short cells in the straw pulp. 3. As to the air permeability, the larger ratio of straw pulp was found to be the lesser, and 75% bast fiber with 25% straw pulp mixture paper and the 100% bast fiber one were found 1/5 degree efficient. 4. In terms of the water absorption degree, 100% bast fiber paper was the fastest, but in case of mixture paper, 50% mixed one was a little faster up to the point of 1cm, while the two kinds of mixed ones appear to be almost similar to each other beyond the point. 5. The straw pulp mixed paper, especially the 50% mixed one was evaluated as the highest by the calligraphers who had experienced using the papers in terms of movement and feeling of the caligraphy and painting. In addition, although the 25% mixed paper is judged to be good for book printing because of the strength, the 50% mixed paper can be thought to be more desirable for painting and calligraphy. In conclusion, we will be able to make the quality paper with durability, by mixing the straw pulp with the bast fiber in proper ratio, following the tradition of Korean paper making.
The Study of Restoration Technique of Wax-treated Volume for the Annals of the Joseon Dynasty(I) - Evaluation of degradation behavior of reproduced waxy paper -
Jeong, Seon-Hwa ; Jeong, So-Young ; Seo, Jin-Ho ; Lee, Hye-Yun ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 39, issue 1, 2007, Pages 56~63
The purpose of this research was to identify causes of damage of wax-treated volume of "The Annals of the Joseon Dynasty". As one of the efficient restoration methods, analyses of damaged state of reproduced wax-treated paper through tests of degradation of wax-treated paper under an artificial setting were performed, and in particular, differences between lightness and acidity were observed. On the whole, it was confirmed that yellow wax-treated papers were more stable than white wax-treated papers against artificial aging treatment, which is thought to be because the white wax-treated paper was more affected by a variety of substances interacting with paper than yellow wax-treated paper under artificially aged conditions, which were added in the course of refinement and processing operation such as decolorization and deodorization.
Development of Inner Packaging Material for Maintaining the Freshness of Fruits and Vegetables
Won, Jong-Myoung ; Song, Je-Yun ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 39, issue 1, 2007, Pages 64~68
The oak and pine charcoal were used to develop the inner packaging material for maintaining the freshness of vegetables and fruits, and to investigate the possibility in the application for inner packaging. The effects of the charcoal type, species, particle size, and grammage on the adsorption efficiency of ethylene gas were studied. White charcoal has superior ethylene gas adsorption performance to those of black charcoal. Pine charcoal was superior to oak charcoal in the ethylene gas adsorption. Higher gas adsorption was obtained by the higher grammage sheet. The difference in the adsorption efficiency was not significant between ONP and KOCC.
The Development of Design Structure for Environmental Friendly Non-Staple Boxes and Cases Made by the Carton and Corrugated Paperboard
Cho, Yong-Min ; Um, Gi-Jeung ; Kim, Jin-Moo ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 39, issue 1, 2007, Pages 69~77
Carton and corrugated paperboard have excellent convertibility characteristics that could be easily slitted, folded, and inserted to become a certain shape of box or case. This excellent processing characteristics of carton and corrugated paperboard as well as their recyclability will continue to make them possess high portion in packaging markets. However, staple, tape, or adhesive have been used to seal a paperboard packaging box or case. Staples among them have been frequently used in many cases because of their convenience. Staples could enter the inside the box and give wounds to the goods in the box or case. Furthermore additional handling and waste treatment costs in the making and recycling processes would be necessary when staple is used to seal box or case. This study has been carried out to develop non-staple paperboard packaging box & case designs that can be used to make non-staple boxes & cases. It is believed that the non-staple folding paperboard boxes & cases could be more environmental-friendly, beautiful, and economic than staple boxes & cases.