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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
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Journal DOI :
Korea Technical Association of the Pulp and Paper Industry
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Volume & Issues
Volume 40, Issue 5 - Dec 2008
Volume 40, Issue 4 - Dec 2008
Volume 40, Issue 3 - Sep 2008
Volume 40, Issue 2 - Jun 2008
Volume 40, Issue 1 - Mar 2008
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Effect of Surface Sizing with Cationic Polymer Additives on the Coating Structure and Coated Paper Properties
Jun, Dae-Gu ; Lee, Hak-Lae ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 40, issue 1, 2008, Pages 1~8
It is essential to use base papers having proper surface characteristics in coating operation for improving coated paper quality and coater runnability. To fulfill these purposes, surface sizing of coating base stock with oxidized starch is commonly practiced. Use of cationic starch for surface sizing improves coated paper quality since cationic starch penetrates less into paper structure. The immediate objective of this study was to examine the influence of surface sizing with starch solutions containing cationic polymers on the rheology of coating colors and the effect on physical properties of coated papers. Changes of rheological characteristics of coating colors placed on the plastic substrate surface sized with cationic and anionic starch were determined. Results of rheological test showed that cationic polymer surface sizing agent increased electrostatic interaction with coating colors and increased storage modulus. This new technology of using cationic polymer as surface sizing additive was considered to be advantageous for base papers at low basis weights since it would improve the coverage and optical properties of coated papers.
Improvement of Physical Characteristics of Paper with Micro Pulp
Kim, Hak-Sang ; Kim, Bong-Yong ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 40, issue 1, 2008, Pages 9~14
Beating and using chemical agents are common methods to improve physical properties. But the beating is high energy consumption process and chemical agent addition may cause deteriorate waste water quality. Therefore, it is necessary to use more environment-friendly methods. In this study, micro pulp was used in the handsheet making to get improving effects of physical properties without beating treatment and chemicals. Stiffness, thickness and air permeability were increased and strength properties of paper were also improved to some extents by only the micro pulp addition.
Application of Sea Algae Fiber for the Improvement of Compressibility and Physical Properties of Letter Press Printing Paper
Kim, Byong-Hyun ; Seo, Yung-Bum ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 40, issue 1, 2008, Pages 15~22
For the improvement of letterpress printing paper quality, special fibers obtained from the sea were used by mixing with wood fibers. The sizes of the special fibers, which were from red algae in the sea, were 0.5-1 mm in length, and 3-7
in width, respectively, and the fibers were supplied by Pegasus Research Inc. for the study. From the study, it was found that 10% addition of algae fibers greatly improved paper surface strength and internal bonding strength. The compressibility was estimated by utilizing 'Print-surf method' at high clamping pressure and with hard backing. Again, 10% addition of algae fibers greatly improved the compressibility of the paper. These results were expected that algae and wood fibers were distributed evenly through the sheet, and integrated one another to leave no empty space inside the paper.
Physical Properties of Functional Hanji Added Inorganic Marerials
Jo, Hyun-Jin ; Yoon, Seung-Lak ; Park, Soung-Bae ; Kim, Yun-Geun ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 40, issue 1, 2008, Pages 23~28
Functional hanji was manufactured using the bast fiber of Broussonetia kazinoki and various inorganic compounds such as kaolin, talc, elvan, and ocher, and the physical and optical properties were investigated. The residual percentages of kaolin, talc, elvan and ocher in the functional hanji were above 50%. The density of the hanji increased with the increase of the content of inorganic compounds. The hanji manufactured using ocher showed the highest density. The breaking length and burst factor decreased with the increase of inorganic materials, indicating that physical properties of hanji were not improved by adding inorganic materials. The emission rates of far-infrared radiation increased in the hanji manufactured using inorganic materials. The higher emission rates were observed in the hanji with elvan or ocher. Addition of inorganic compounds to hanji showed the flame retardative effect. The colorfastness to light of the hanji with elvan or ocher was the degree of 4, which explained by the characteristic color of the inorganics.
Charcoal Application to Paper and Analysis of Gas Absorption Capability
Ko, Jae-Hyoung ; Jeong, Jin-Mo ; Min, Kyung-Eun ; Lee, Dong-Young ; Park, Jong-Moon ; Kim, Byung-Ro ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 40, issue 1, 2008, Pages 29~34
The charcoal has been used not only as fuel but also as human health care material since it was used. Charcoal's performances were generally investigated in aspects of energy efficiency and caloric values. This study was conducted in order to increase charcoal's application area and to develop functional paper. Five types of charcoal were used on a basis of gas absorption properties from previous study. Handsheets were made by two methods by internal loading and surface spray on interlayer. Strength properties of internal loading and interlayer spray handsheets were decreased as the charcoal loading increased. Ethylene gas absorption property was higher in both of oak's black charcoal and white charcoal than others. In terms of strength, 5-10% charcoal loading was efficient. Above 10% loading, a rate of strength decrease was higher than that of ethylene gas absorption rate. Formaldehyde absorption property was higher at both of oak's black charcoal and mixed charcoal than others. However, to guarantee enough charcoal loading should be higher than 95
for sufficient formaldehyde absorption.
Preparation and Properties of Embossing Treated Fruiting Bag
Kim, Kang-Jae ; Park, Seong-Bae ; Eom, Tae-Jin ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 40, issue 1, 2008, Pages 35~40
The environment of agriculture in Korea is changed very rapidly. Since the labours in fruit cultivation field are getting older, the resources and the aid materials for farming need to be multi functional and easy to use. Therefore, They have to use various kind of aid materials in field of fruit cultivation like as fruiting bag. The development of practical utilization way of embossing process for manufacturing of fruiting bag and wrapping paper of agricultural products was main purpose of this study. Embossing roll was designed in Ginyong Embo(Co.) for the embossing process of fruiting bag. The embossing treated fruiting bag was manufactured in Agro(Co.) at mill scale. The mechanical properties of embossing paper was investigated and operation efficiency of bagging was tested at field. The properties of embossed paper was satisfied for fruiting bags for cultivation of apple and pear.
Determination of the Optimum Flocculant Mixing Ratio for Paper Making Wastewater Treatment
Cho, Jun-Hyung ; Kang, Mee-Ran ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 40, issue 1, 2008, Pages 41~46
In this study, dewaterability, one of the important properties of wastewater sludge, was investigated using a simple capillary suction time (CST) measurement method. It turned out that one could use the results of CST to find optimum flocculants ratio to improve drainage in wastewater treatment for the printing paper, tissue paper, and newsprint paper mill. Since the optimum ratio of flocculants could be determined with the value of CST, COD removal efficiency could be improved and optimum floc strength could be achieved with precise ratio of flocculants. It was thus that using CST for determining the optimum ratio of flocculants could be economical by reducing the amount of flocculants. Dewaterability could be measured within several seconds using the values of CST in a precise way. The dewaterability could also be useful in investigating the optimum ratio of flocculants.
Effects of Mixing Ratio of ONP and OCC on Physical Properties of Pulp Molds for Cushion Packaging Materials
Park, In-Sik ; Kim, Jai-Neung ; Kim, Dae-Yong ; Lee, Youn-Suk ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 40, issue 1, 2008, Pages 47~54
As the demands of environment protection increases, the pulp mold container is developed to substitute for EPS (expanded polystyrene) as a shock absorbing packaging material. The water-absorbing ratio and mechanical properties such as tensile strength and compressive strength of pulp mold are important factors to evaluate its shock absorbing characteristics. Influences of mixing ratios of ONP (old newspaper) and OCC (old corrugated container) on physical properties of pulp mold were investigated at various conditions of temperature and relative humidity. The optimum mixing ratio of ONP and OCC was also searched based on physical properties. The results showed that when relative humidity was increased from 60% to 90%, the water absorption ratio of pulp mold increased significantly, tensile strength decreased 20
30%, and compressive strength decreased 10
20%. In addition, the optimum mixing ratio of ONP and OCC was found to be 50%:50%.
The Analysis of the Oxidation Index of Korea Traditional Paper(Hanji) Which Is Used as the Rrestoration Paper of the Waxed Volume in the Annals of Joseon Dynasty
Seo, Jin-Ho ; Jeong, So-Young ; Jeong, Seon-Hwa ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 40, issue 1, 2008, Pages 55~61
The annals of Joseon Dynasty is the most valuable resource containing the record of Korean history and has been known as one of the UNESCO's Memory of the World Register. In some period, wax-treated paper was used in the annals of Joseon Dynasty to prevent the damage from pests. But, wax-treated volumes were discolored to brown, white or black, and partially cracked by the stiffened wax. It means that wax-treated volumes were damaged by the hardening and oxidizing of wax. The wax is considered as the first reason in damages on the wax-treated volume. Therefore, in this study we analysed the oxidation index of Korea traditional paper(Hanji) which is used as the restoration paper of the waxed volume in the annals of Joseon Dynasty by using FT-IR. As the analysis of FT-IR, the traditional two-layed stamping paper (Hanji sample F), which was treated by starch in its surface, was shown the most stable state after the accelerated ageing test.
Use of Red Algae Fiber as Reinforcement of Biocomposite
Lee, Min-Woo ; Seo, Yung-Bum ; Han, Seong-Ok ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 40, issue 1, 2008, Pages 62~67
Biocomposite was fabricated with biodegradable polymer and natural fiber that has potential to be used as replacement for glass fiber reinforced polymer composite with the benefits of low cost, low density, acceptable specific strength, biodegradability, etc. Until now, mostly natural cellulosic fibers on land have been used as reinforcement for biocomposite. The present study focused on investigating the fabrication and the characterization of biocomposite reinforced with red algae fibers from the sea. The bleached red algae fiber (BRAF) showed very similar crystallinity to the wood cellulose. It has high stability against thermal degradation (maximum thermal decomposition temperature of 359.3
) and thermal expansion. Biocomposites reinforced with BRAF have been fabricated by a compression molding method and their mechanical and thermal properties have been studied. The storage modulus and the thermomechanical stability of PBS (polybuthylenesuccinate) matrix are markedly improved by reinforcing with the BRAF. These results indicate that red algae fiber can be used as an excellent reinforcement of biocomposites, which are sometimes called as "green-composites" or "eco-composites".