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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 43, Issue 5 - Dec 2011
Volume 43, Issue 4 - Dec 2011
Volume 43, Issue 3 - Sep 2011
Volume 43, Issue 2 - Jun 2011
Volume 43, Issue 1 - Mar 2011
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Quality Improvement of Rayon Grade Bamboo Pulp by Modified Bleaching
Tripathi, Sandeep ; Mishra, Om Prakash ; Sharma, Nirmal ; Chakrabarti, Swapan Kumar ; Varadhan, Raghavan ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 43, issue 2, 2011, Pages 1~8
The presence of high silica in bamboo hinders the use of this material for production of rayon grade pulp. Research has been carried out to overcome this deficiency and improve quality of rayon grade pulp with the modification in pulping and bleaching process. Effect of acid boosted water prehydrolysis, sulphuric acid pre-treatment of unbleached pulp, chlorination stage at lower pH and treatment of bleached pulp with
water were evaluated. Acid boosted water prehydrolysis of chips reduces prehydrolysis time by 50 minutes as compared to water prehydrolysis. Treatment of unbleached pulp with sulphuric acid reduces ash, acid insoluble, silica, calcium and iron contents of the pulp by 56, 31, 82, 84 and 60% respectively. The addition of acid, increase in kappa factor in
stage and combination of both were effective in removing silica in the pulp. Treatment of final bleached pulp with
water removes silica to a great extent and improves optical properties of the pulp as compared to
or PAA. Pretreatment of the pulp with acid and modification in the bleaching process can reduce silica substantially and improve the quality of rayon grade bamboo pulp.
Fundamental Study on the Quantitative Analysis of Fluorescent Whitening Agent used for Papermaking
Lee, Ji-Young ; Kim, Chul-Hwan ; Lee, Hui-Jin ; Gwak, Hye-Joeng ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 43, issue 2, 2011, Pages 9~15
Fluorescent whitening agent (FWA) is a widely used chemical in paper industry, but a systematic and scientific method on FWA analysis has not been established. We performed the basic researches on the fluorescence analysis of FWA. The fluorescence of FWA was investigated using a spectrofluorometer and a spectrophotometer. When FWA solution was analyzed using the spectrofluorometer, we found that the peak wavelength of the fluorescence emission was about 440 nm and that of the fluorescence excitation was about 370 nm irrespective of FWA types. Papers dyed with an internal FWA were prepared in a laboratory and the reflectance and the fluorescence index were measured using the spectrophotometer. It was confirmed that the optimum peak wavelength of the reflectance was 440 nm and the fluorescence index calculated from the CIE whiteness with and without UV light under a light source D65 was the best indicator to measure the fluorescence of FWAs exiting in papers.
Development of Modified Printing Hanji Using Alternative Plant Fibers (II) - Printability of Printing Hanji Made of Alternative Plant Fibers -
Lee, Ji-Young ; Seo, Jeong-Min ; Kim, Chul-Hwan ; Eom, Tae-Jin ; Park, Hyun-Jin ; Kim, Sung-Ho ; Kim, Gyeong-Chul ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 43, issue 2, 2011, Pages 16~23
This study was carried out to develop the printing Hanji made of mixed raw materials with mulberry bast fibers and alternative plant fibers such as bamboo, soybean stalks, pepper stalk and sea tangle. All alternative plant fibers were produced by the kraft pulping method with 2 stages of bleaching, and used to prepare the modified traditional paper, Hanji for printing purpose. Printing quality of modified Hanji was analyzed by measuring area and Formcircle of halftones and comparing a letter shape printed on paper. The Hanji made of 60% of mulberry bast fibers and 40% of bamboo bleached kraft pulp showed the best printing quality with the smallest area and the largest Formcircle in all modified Hanji. Through the image analysis of form circles of the letters printed on the Hanji, it could also be confirmed that the best printability of the modified Hanji was made using bamboo fibers.
Accelerated Aging Characteristics of Electroconductive Paper
Kim, Bong-Yong ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 43, issue 2, 2011, Pages 24~30
The accelerated aging characteristics of electroconductive papers manufactured with a mixture of carbon fiber were investigated by heating in dry oven. By accelerated aging time, the tensile strength, tensile stretch of the papers were decreased more slowly with increase of carbon fiber content, but the electrical conductivity was more rapidly decreased in case of high carbon fiber content. The weight loss of papers by thermal analysis were reduced as increasing the carbon fiber content. These results were indicated that the electrical conductivity of carbon fiber was diminished easily by heat aging, but thermal characteristic of carbon fiber was much better than that of wood pulp.
Studies on the Characteristics and Resources of Fiber of Arrowroots(Part 2) - Sheet surface characteristics and pulping of Arrowroots -
Jo, Hyun-Jin ; Yoon, Seung-Lak ; Hwang, Byung-Ho ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 43, issue 2, 2011, Pages 31~39
The applicability of arrowroots as materials for paper manufacture was investigated by evaluating the characteristics of arrowroots pulping and pulps, and the surface characteristics of paper made of arrowroots. The results is as follows. The yield of grounded pulp, alkaline pulp, grounded bleach pulp, and alkaline bleach pulp are 98.0%, 37.7%, 84.8%, and 32.5%, respectively. The extraction components in arrowroot's fibers was shown high in 1%-NaOH extraction. The amount of holocellulose and lignin were largely decreased, but a slight decrease was shown in the bleaching processes. Many shivers were shown in the grounded fibers. The amount of shivers was decreased and the single fibers were increased during the process of bleaching. The alkaline pulp and the alkaline bleach pulp showed high in the beating time and freeness than the grounded pulp and grounded bleach pulp. The conditions of sheet surface according to beating time is effected largely by the conditions of original pulp.
Studies on the Reinforcement Treatment of Aged Hanji Using Cellulose Derivative Solutions
Kang, Kwang-Ho ; Kim, Hyoung-Jin ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 43, issue 2, 2011, Pages 40~48
To build up the conservativeness of aged paper heritages, the strength reinforcement treatment using various cellulose derivative solutions was considered. Hand-made Hanji prepared by traditional papermaking technique was firstly simulated in order to modify the overall of paper properties like aged paper heritages by accelerated ageing treatment at
for 24 hours, and then the ageing stability of Hanji was verified through the secondary accelerated ageing at
for 12 hours. The physical properties of aged Hanji were improved by applying with cellulose derivative solutions. The ageing stability for physical, optical (L, brightness, opacity, yellowness) and chemical (oxidation index, degree of polymerization) properties of aged Hanji treated with all kinds of cellulose derivative solutions was also good compared to those of untreated samples, especially using MC solution. Therefore, it was that a kind of MC solution would be well-suited for the strength reinforcement treatment of aged paper heritages.
Preparation of Base Paper for Mulching Mat Sheet Using Biodegradable Polymer
Lee, Geum-Ja ; Park, Ji-Hyun ; Kang, Kwang-Ho ; Kim, Hyoung-Jin ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 43, issue 2, 2011, Pages 49~56
Mulching technique is used to control the temperature and moisture content of soil by covering the ground surface. Most kinds of mulching film are made of polyethylene which is non-biodegradable synthetic polymer. Utilizing these films has been one of the main sources in soil pollution. Thus residual films under the ground should be removed after a certain period of time. Therefore, an alternative mulching material made of biodegradable functional paper is considered instead of non-biodegradable films. The mulching sheet produced from paper basis has a functionality to be naturally degraded and then recycled to the bio-materials on soil. In this study, the paper based-mulching sheet coated with biodegradable polymer was specially produced using a laboratory bar coater. Coating colors prepared by dissolving PBS/PLA in chloroform were applied to kraft paper. The mechanical strength and aging properties of this mulching sheet were investigated. The burst strength of polymer-coated paper was decreased with the increase of the PBS ratio in PBS/PLA blends, and, in particular, 30/70 blending condition led to good stability in heat-aging atmosphere for 60 days.
Development of High Viscosity Pulping Method for Korean Paper (I) - Atmospheric Pressure Pulping Characteristics of Paper Mulberry White Bast -
Lee, Sang-Hyun ; Choi, Tae-Ho ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 43, issue 2, 2011, Pages 57~65
Pulping of paper mulberry (Broussonetia kazinoki) white bast has been examined by novel atmospheric pressure pulping methods. The viscosity of pulp has been found to be highly sensitive and variable with pulping methods. Therefore, selections of pulping chemicals and conditions are very important. Two kinds of pulping procedures were employed for the high viscosity pulp manufacturing. The one is ammonium oxalate treatment and the other is sodium chlorite and acetic acid treatment. Not only chemical components and pulp yields which of paper mulberry white bast but also water retention value (WRV), whiteness index, yellowness index, and colors of every pulp were examined. The hot water, 1% NaOH, and ethanol-benzene extractives which of paper mulberry white bast were 4.48%, 28.45%, and 2.84%, respectively. The contents of holocellulose, lignin, and ash were 90.66%, 1.05%, and 2.18%, respectively. In the pulp yields, group 1 which treated with only ammonium oxalate were 77.04-81.71%, group 2 which treated with ammonium oxalate and acidified sodium chlorite separately and washed between first and second stages were 64.15-83.90%, group 3 which treated with ammonium oxalate and acidified sodium chlorite separately and not washed between first and second stages were 57.35-73.17%, and group 4 which treated with mixed ammonium oxalate and acidified sodium chlorite were 66.58-68.43%. The pulps treated with acidified sodium chlorite showed high whiteness index, but the pulps treated with only ammonium oxalate showed high yellowness index. Variations in the combinations of treatments resulted in different pulp characteristics.
Effect of Alkyl Ketene Dimer(AKD) on Red Algae Reinforced Biocomposites
Lee, Min-Woo ; Park, Dong-Hui ; Seo, Yung-Bum ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 43, issue 2, 2011, Pages 66~71
Biocomposites were fabricated with biodegradable polymers and natural fibers. Biocomposites have benefits of low cost, low density, and biodegradability over inorganic fiber composite, and give comparable strength properties. Hydrophobic polymer used for sizing in paper industry, AKD (Akenyl Keten Dimer), was applied to natural fibers, red algae fibers (RAF) in this study, to make fiber surfaces more compatible to hydrophobic nature of matrix polymers. Composites with RAF, kenaf, glass fibers, and carbon fibers have been fabricated by a compression molding method and their thermo-mechanical properties have been studied. Also, the thermal dimensional stability test was done from at 30 to
. The storage moduli and the thermo-mechanical stabilities of polypropylene and poly lactic acid based biocomposites were improved by reinforcing with the RAF and much more with AKD treated fibers. Dimensional stability of biocomposite was also markedly improved by AKD pretrement on RAF.
Antimicrobial Properties of Paper Treated with Acidic Liquid from Carbonized Rice Hull
Min, Choon-Ki ; Jo, Joong-Yeon ; Shin, Jun-Sub ; Lee, Se-Eun ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 43, issue 2, 2011, Pages 72~76
Antimicrobial activities of the Acidic Liquid originated from Carbonized Rice Hull(ALCRH) and the paper treated with ALCRH were investigated to apply ALCRH to functional paper products as a natural antimicrobial agent. ALCRH showed antimicrobial activity for bacteria and yeast, with higher performance for bacteria than for yeast. Antimicrobial activity was not developed on paper coated with ALCRH by bar coater probably due to the evaporation of antimicrobial compounds of ALCRH from the paper surface with time. Saturation of paper with ALCRH was essential to develop antimicrobial activity on the paper. Dipping paper in ALCRH solution was recommended as one of the effective ways to make antimicrobial paper.
Changes in Wet Pressing Response of OCC stock by the Beating Time and the Addition of Polymer Aids
Sung, Yong-Joo ; Lee, Han-Ba-Roh ; Jeong, Wong-Ki ; Jung, Jae-Gwon ; Choi, Song-Gu ; Im, Chang-Kuk ; Gwon, Wan-Oh ; Seo, Yong-Bum ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 43, issue 2, 2011, Pages 77~82
The changes in the wet pressing response of old corrugated container(OCC) stock depending on the beating treatment and the addition of polymer aids were investigated with laboratory roll press instrument. Two types of polymer aids, such as high molecular weight polymer with low charge density and low molecular weight polymer with high charge density, were applied in this study. The more beaten OCC stock showed the lower dryness after wet pressing. The addition of polymer aids had great influences on the wet pressing efficiency and paper properties. The dryness after wet pressing was increased by the addition of polymer aids, but the pattern of changes in dryness were different depending on the type of polymer and the properties of stock. The higher molecular weight polymer aids showed the greater increase in the dryness. The properties of paper such as air permeability, bulk, formation, tensile strength were also greatly affected by the addition of polymer aids.