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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
Editor in Chief :
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
Type of Foreign Materials in Waste Paper Used for the Manufacture of Linerboard and Physical Properties of Recycled Fibers
Yoon, Seung-Lak ; Hwang, Jong-Yeol ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 39, issue 3, 2007, Pages 1~11
To evaluate the quality of waste paper used for the manufacture of linerboard, the types of papers and foreign materials in compressed waste paper currently used were investigated. The recycled fibers were obtained from printing paper, newspaper, wrapping paper, white coated paperboard and corrugated container. Their fibers were observed by using a microscope, and the mechanical properties of the recycled papers manufactured from the recycled fibers were investigated. The compressed wastepaper was composed of 54% paperboard, 20% printing paper, and 20% newsprint. The content of foreign materials was about 4%, showing higher contents compared to 1% of foreign substances provided by Korea paper manufacturers' association. The types of foreign materials were various, which include vinyls, plastics, metals, woods, styrofoams, and cloths. Sound fibers were generally observed in the recycled fibers of printing papers and wrapping paper. The recycled fibers of white coated board, corrugated container and newsprint showed to be generally damaged. The whiteness of each recycled fiber were highly affected by pulp bleaching and ink-particle mixing conditions. The values of breaking length and burst index were lower than those for corrugating medium and liner board specified in KS. Although the anatomical characteristics of recycled fibers varied, their strengths appeared to be similar. This result may be explained by the use of non-deinked fiber.
Improvement of Multiply Board Properties with Starch Spraying
Lee, Hak-Lae ; Ryu, Jeong-Yong ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 39, issue 3, 2007, Pages 12~23
Frequently spraying of natural starch slurry onto the formed wet web has been adopted to improve properties of paperboards. This conventional starch spraying technique, however, becomes less effective in strength improvement. In this study the effects of various factors including wet web dryness, quantity of starch slurry sprayed, and drying temperature on paperboard properties were investigated. Migration of starch granules into the webs appeared to cause a reduction in plybond strength when the web dryness was lower than this level. Wet webs should contain enough water to swell the starch granules, and at the same time they should be heated to a temperature high enough for complete cooking of the sprayed starches to occur. This suggested that preheating of the wet web can be employed to improve the plybond strength.
The Modification of Stress-Strain Properties of KOCC by the Mechanical Means
Won, Jong-Myoung ; Kim, Si-Young ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 39, issue 3, 2007, Pages 24~29
The stress and strain properties of KOCC were modified to improve the performance of KOCC as a packaging raw material. The refining consistency, refining degree, blending conditions and the grammage of handsheet were varied. The stress-strain properties, tensile energy absorption were measured. The refining improved significantly the stress and strain properties of paper, especially at lower refining consistency. The increase of grammage also contributed to the improvement in the stress and strain of paper. It was also found that the refining, blending and grammage contributed to the increase of tensile energy absorption. However, it is strongly recommended to apply the combination of refining consistency, refining degree and mechanical treatment(blending).
Evaluation of Folding Properties of Paperboard with Folding Angle and Rate
Youn, Hye-Jung ; Chin, Seong-Min ; Ryu, Jae-Ho ; Kwon, Hyun-Seung ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 39, issue 3, 2007, Pages 30~35
Folding performance is very important in box manufacturing process using paperboard. To evaluate the folding performance of various paperboards, we measured the folding moment and folding behavior at the different folding angle and rate conditions. When linerboard with grammage of
was folded up to
, the compression break and delamination of sheet were observed. The maximum folding moment was little affected by folding angle, but it was increased logarithmically with folding rate. And the effect of paperboard thickness was significant. The maximum folding moment of MD sample was higher than one of CD sample by 40%.
Properties of GPAM Emulsion for a Wet Strength Agent
Kim, Bong-Yong ; Son, Dong-Jin ; Kim, Hak-Sang ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 39, issue 3, 2007, Pages 36~40
It has been problematic to repulp the dry broke treated with permanent wet strength agents like PAE, UF and MF. Solution type GPAM has the benefit of easy repulping but it has problems of cocross-linking and tends to gel. Therefore, the product concentration must be lower than 10% to reduce the gel generation problem. We developed emulsion type GPAM by an inverse emulsion technology to resolve both the repulping problem with permanent wet strength agents and the stability problem of GPAM solution products.
Studies on Relations between High Solid Coating and Quality Changes(I) - Effects of major process factors on coating color rheology -
Lee, Yong-Kyu ; Yoo, Sung-Jong ; Cho, Byoung-Uk ; Kim, Yong-Sik ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 39, issue 3, 2007, Pages 41~51
In order to elucidate the effects of types and mixing ratio of GCC and clay, coating color concentration, and types of rheology modifiers on high solid coating, various coating colors were prepared, high shear viscosity was measured and then rheology of the coating colors was analyzed. Coating color concentration was able to be increased from 67% to 69% and from 68% to 71% with a higher GCC ratio and with the rheology modifier instead of the synthetic thickener, keeping similar or improved coating color rheology and coated paper quality. The rheological properties of high solid coating color were superior with smaller average particle sizes of clay and latex, wider size distribution of GCC and higher added amount of latex.
Studies on Relations between High Solid Coating and Quality Changes(II) - Effect of high solid coating on coated paper properties -
Lee, Yong-Kyu ; Yoo, Sung-Jong ; Cho, Byoung-Uk ; Kim, Yong-Sik ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 39, issue 3, 2007, Pages 52~59
This paper confirms that high solid coating can increase coating speed and reduce drying cost. Low solid coating color with the synthetic thickener and high solid coating color with the rheology modifier and with higher ratio of GCC were prepared. Coated paper was then produced with an industrial coater, varying coating speed and dryer temperature in order to keep the moisture content of the coated paper constant. Coating color concentration was able to be increased from 66% to 69% and from 68% to 71% without an adverse effect on coating color rheology. With a help of the rheology modifier, the increased ratio of GCC in high solid coating did not show harmful effects on the coated paper quality.
Extermination of Rice Weevils of Kraft Paper Containing Garlic Extractives and Pine Leaf Powder
Kim, Chul-Hwan ; Sin, Tae-Gi ; Kim, Gyeong-Yun ; Jung, Ho-Gyeong ; Huh, Jeong-Soo ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 39, issue 3, 2007, Pages 60~69
This study developed rice packaging paper with exterminating performance against rice weevils such as Tenebroides mauritanicus and Sitophilus oryzae. The exterminating performance of packaging paper was given by treatment of garlic extractives and pine-leaf powder, respectively. For the exterminating test, rice weevils were put in petri dish containing non-treated packaging paper and functional packaging paper for twenty days. Right after being put in the petri dish, the rice weevils moved fast toward the area in the non-treated paper escaping from that in the functional paper. The lethality of the rice weevils on the functional paper reached over 50 per cent. The physical properties of the functional packaging paper were rarely changed in spite of treatment of the exterminating agents.
The Characteristics of Hanji Prepared with Lacquer
Jo, Hyun-Jin ; Lee, Sang-Kueg ; Roh, Jeong-Kwan ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 39, issue 3, 2007, Pages 70~76
The raw oriental lacquer produced in China was used in this study. This lacquer was diluted with ethanol and terpene in different solvent ratios. The diluted lacquer in the solvents had two layers. The upper layer was solvent soluble and the lower contained precipitates. Hanji was treated with the solvent solubles and the mixture containing precipitates, and then properties of the Hanji were evaluated. The average weight, thickness, and density of Hanji treated with oriental lacquer tended to gradually be decreased as the lower concentration of lacquer was used and as the solvent soluble was treated. Tensile strength of the treated Hanji decreased when the diluted lacquer was used and Hanji treated with terpene dilution at the ratio of lacquer to solvent of 1:5 (v/v) showed higher tensile strength than ones treated with ethanol dilution. The folding endurance decreased as the less concentrated lacquer was used and the highest value was obtained when 1:40 (v/v) of lacquer to solvent ratio in both ethanol and terpene mixture. Absorption ratio was higher in the Hanji treated with ethanol mixture, treated with the lacquer in lower concentration, and treated with ethanol mixture. Hanji treated with ethanol dilution at 1:20 (v/v) and the lower ratio of lacquer to solvent showed a hydrophobic property. Amount of the bound dye materials tended to be decreasing as the concentration of lacquer became lower and it was higher in Hanji treated with ethanol mixture than with terpene mixture.
Production and Characteristics of Cellulose from Saprolegnia ferax
Kang, Jin-Ha ; Park, Seong-Cheol ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 39, issue 3, 2007, Pages 77~83
This study was carried out to examine the optimum culture condition for the production of cellulose from Saprolegnia ferax and its physical characteristics. Conclusions obtained from the results of this study were as follows: In producing the cellulose from S. ferex, optimal pH and temperature were 7.0 and
with a maximum of
, respectively. And, optimal culture period was 11days. WHC and OHC of biocellulose were 3.2(25.04 g/g) times and 3.5(25.75 g/g) times higher than those of commercial
(7.57, 7.25 g/g) respectively. The viscosity of biocellulose is lower than that of commercial
. And the effect of rpm on the viscosity of biocellulose was more than on the that of