About This Journal
About This Journal
Journal of Korea TAPPI (or ‘Palpuchongi Gisul’, abbr. ‘J. of Korea TAPPI, herein ‘KTAPPI’; ISSN: 0253-3200 ) was launched in 1969 to provides advance the scientific knowledge and to share the novel technologies in all related area of pulp, paper and biomass utilization. KTAPPI is published in English and Korean, bimonthly on the last day of even number months (February 28, April 30, June 30, August 30, October 30 and December 30), and indexed in ‘SCPOUS.
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Research Article
- Inorganics and Printing Image Analysis by Micro X-ray Fluorescence Analysis in Base Paper and Printed Ink
- Rahmini, Nanang Masruchin, Soo-Jeong Shin
- Understanding the elemental composition and distribution of inorganics in both base paper and printed ink is crucial for various applications, including paper …
- Understanding the elemental composition and distribution of inorganics in both base paper and printed ink is crucial for various applications, including paper and ink manufacturing, printing process optimization, and cultural heritage conservation. The primary objective of this study was to investigate the potential of micro-X-ray fluorescence (µ-XRF) analysis in examining inorganics and their impact on the image quality of printed materials. The research involved analyzing different base papers containing precipitated calcium carbonate and ground calcium carbonate as filler and printed ink (e.g., inkjet and offset) using µ-XRF. The elemental maps and spectra obtained from µ-XRF provided useful information about the inorganic elements present in the paper and ink layers. Image analysis techniques were employed to establish a correlation between the elemental distribution in the printed image and its visual characteristics. By focusing on key elements found in pigments, fillers, and other components, µ-XRF analysis provides valuable insights into the printing process, ink-paper interactions, and the resulting visual properties of the printed image. The study successfully differentiated between paper types based on their unique inorganic signatures, primarily by examining the magnesium content to distinguish heavy and light calcium carbonate fillers. The analysis of printed ink sections using µ-XRF revealed distinct elemental profiles for each ink type, making it possible to clearly identify inkjet and offset printing. Overall, this study suggested that µ-XRF analysis is a valuable tool for understanding the complex relationship between inorganic elements, printing methods, and image quality. Further investigation is required to examine how the quality of images is affected by the paper substrate. Additionally, investigating the combined effect of multiple elements and their interactions within the printing system can provide a more comprehensive understanding. Integrating µ-XRF with other analytical techniques can offer further insights into the complex interplay between paper, ink, and printing processes. - COLLAPSE
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Research Article
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Synthesis of Chitosan-Derived Schiff Bases for Enhanced Antioxidant Activity and Dye Adsorption Capabilities
향상된 항산화 활성 및 염료 흡착 성능을 위한 키토산 기반 시프 염기의 합성
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Ji Woo Kim, Ji Won Heo, Qian Xia, Min Soo Kim, Do Hun Oh, Yong Sik Kim
김지우, 허지원, 하건, 김민수, 오도훈, 김용식
- Chitosan, a natural polysaccharide derived from the exoskeletons of shrimp and crabs, has amino and hydroxyl groups that provide biocompatibility, biodegradability, and …
- Chitosan, a natural polysaccharide derived from the exoskeletons of shrimp and crabs, has amino and hydroxyl groups that provide biocompatibility, biodegradability, and antioxidant activity. This study aimed to enhance these properties by preparing chitosan-based Schiff base derivatives (CSB) containing phenolic hydroxyl groups. The formation of CSB was confirmed through physical and chemical structure analysis, demonstrating enhanced antioxidant capabilities and dye adsorption. Using 2,2-diphenyl-1-picrylhydrazyl (DPPH), the antioxidant activity of CSB was evaluated, showing a radical scavenging activity of 97.85% at the highest concentration, compared to 42.54% for chitosan. This significant enhancement is attributed to the introduction of phenolic hydroxyl groups. CSB's adsorption capacity for cationic and anionic dyes was tested, revealing excellent performance for anionic dyes due to its Schiff base structure. Optimization of experimental conditions showed that the adsorption capacity for anionic dyes increased from 305 to 710 mg/g. The Langmuir isotherm indicated monolayer adsorption with a maximum capacity of 1282.60 mg/g, and the pseudo-second-order kinetics model suggested chemical adsorption. These findings confirm CSB's improved antioxidant properties, potentially useful in food preservation and packaging, and its excellent capability for adsorbing organic dyes, indicating potential application in pollutant removal. - COLLAPSE
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Synthesis of Chitosan-Derived Schiff Bases for Enhanced Antioxidant Activity and Dye Adsorption Capabilities
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Research Article
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Use of Quaternary Amine Pretreatment Cellulose Nanofibers as Rosin Retaining Agent
아민화 전처리 셀룰로오스 나노섬유의 로진 보류제로서의 사용
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Yoon-Hyuck Choi, Soo-Jeong Shin
최윤혁, 신수정
- Cellulose nanofibers (CNFs) are products that process cellulose at a nanoscale. The cationic surface charge of CNFs can be modified through chemical …
- Cellulose nanofibers (CNFs) are products that process cellulose at a nanoscale. The cationic surface charge of CNFs can be modified through chemical surface modification, and is expected to replace petroleum-based chemicals used as precoagulants or retention aids in the paper industry. In this study, CNFs with varying degrees of quaternary amineralization pretreatment were prepared by controlling the amount of Glycidltrimethylammonium chloride (GMA) added, and their physical properties were analyzed. The 4th aminary CNF was then combined with rosin size to produce a hand sheet. FT-IR spectrum, Stöckigt degree of sizing, and contact angle measurements of the handsheet were performed to evaluate whether 4th aminated CNF can improve rosin size retention. Zeta potential analysis showed that the zeta potential of untreated CNF (Control) was –36 mV, while CA (cation)-CNF 3 with the highest GMA addition was measured at –19 mV. The viscosity also increased with the addition of higher GMA at lower shear rates. FT-IR analysis confirmed the presence of hydrophobic groups –CH2 and –CH3 in rosin size in the hand sheet. Greater changes were observed in hydroxyl (-OH) wavelengths (3,100-3,500 cm-1) as GMA addition increased. Stöckigt's sizing and contact angle measurements showed that the handsheet containing CA-CNF 3 had the highest water resistance. Therefore, this study confirms that the 4th aminated CNF and rosin size are maintained in the hand sheet when GMA is used for pretreatment. - COLLAPSE
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Use of Quaternary Amine Pretreatment Cellulose Nanofibers as Rosin Retaining Agent
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Research Article
- Tough Bioactive Composite Hydrogel of Gelatin Methacrylate and Bacterial Cellulose Prepared by Combined Freeze-Thaw and Photocrosslinking Processes
- Yeji Han, Jinho Hyun
- Despite the excellent structural stability and mechanical properties of bacterial cellulose (BC) hydrogels, BC hydrogels do not have sufficient bioactivity to support …
- Despite the excellent structural stability and mechanical properties of bacterial cellulose (BC) hydrogels, BC hydrogels do not have sufficient bioactivity to support the growth and proliferation of tissue cells. Gelatin methacrylate (GelMA) is a good choice to compensate for the bioactivity of BC hydrogel. However, GelMA itself does not provide sufficient mechanical properties for the structure, and it is also difficult to use as an ink for printing at low concentrations. The increase in GelMA concentration can enhance its mechanical properties, but the biocompatibility decreases due to the increased hydrogel density. Here, we prepared a tough and biocompatible composite hydrogel using BC incorporated with GelMA. A freeze-thaw process was introduced in the fabrication of the BC/GelMA composite hydrogel to improve its mechanical properties. The GelMA interpenetrated in the BC structure was freeze-thawed and photo-crosslinked to enhance mechanical properties. Such a process provided double networks within the highly networked structure of BC. Moreover, the order of freeze-thaw and photo-crosslinking created a significantly different reinforcing effect with the BC/GelMA composite hydrogel. - COLLAPSE
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Research Article
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Evaluating the Stability of Coloring Layers in Azurite and Malachite Used on Traditional Dancheong
전통단청에 사용된 석청과 석록의 채색층 안정성 평가
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Yu-Ju Lee, Tae-Ho Choi
이유주, 최태호
- To form a stable coating layer painted in azurite and malachite with glue during traditional dancheong (Korean decorative coloring on wooden buildings) …
- To form a stable coating layer painted in azurite and malachite with glue during traditional dancheong (Korean decorative coloring on wooden buildings) construction, it is necessary to verify an appropriate concentration of glue solution. To evaluate the stability of the coating layer painted in azurite and malachite, this study set the concentration of glue solution in the glue/alum mixture solution and vehicle at 3.0%, 6.0%, and 9.0%, and coated azurite and malachite with the glue/alum mixture solution and celadonite, and then conducted artificial degradation and outdoor weathering tests on the colored azurite and malachite. A relatively stable coating layer was formed in the specimens painted with a 9.0% concentration of glue solution in the vehicle for azurite and 6.0% and 9.0% concentrations of glue solution in the vehicle for malachite. For azurite, the coloring was found to be poor as its particles were larger than those of malachite and its particle size distribution was not consistent. It was concluded that the concentration of the pigment in the vehicle may vary depending on the particle size, shape, and particle size distribution of the pigment. - COLLAPSE
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Evaluating the Stability of Coloring Layers in Azurite and Malachite Used on Traditional Dancheong
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Research Article
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Effect of Grade and Mixing Ratio of Pulps on the Physical Properties and Drying Efficiency of Multi-ply Thin Paper
펄프 종류와 배합비에 따른 박엽지 합지의 건조 효율 및 물성 평가
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Ji Hyun Tak, Sung Gyu Park, Hae Min Jo, Ji Young Lee
탁지현, 박성규, 조해민, 이지영
- In this study, we attempted to measure the drying efficiency and physical properties of multi-layer thin paper using softwood bleached kraft pulp …
- In this study, we attempted to measure the drying efficiency and physical properties of multi-layer thin paper using softwood bleached kraft pulp (SwBKP), hardwood bleached pulp (HwBKP), recycled steel interleaf and recycled LCD interleaf used in a thin paper mill. Using virgin and recycled pulps, which were confirmed to have excellent drying efficiency and strength in previous studies, two-layer thin papers were prepared in a laboratory, and the minimum drying time until the oven-dried state of a sheet and drying energy reduction were analyzed. After measuring drying efficiency, their tensile strength, light scattering coefficient, and opacity were measured. The mixing ratio of SwBKP and HwBKP was set to 60:40, 40:60, and 20:80 on the top layer, and the bottom layer was made of recycled pulps to prepare two-layer thin papers. As the mixing ratio of HwBKP increased in the top layer and recycled LCD interleaf in the bottom layer was used, the minimum drying time decreased, and drying energy reduction increased. As a result of measuring the physical properties of two-layer thin papers, the tensile strength decreased and opacity increased as the light scattering coefficient increased when the mixing ratio of HwBKP increased and recycled LCD paper was used in the bottom layer. Therefore, if the mixing ratio of SwBKP increases for the top layer and the bottom layer is produced using recycled LCD interleaf, it is possible to manufacture multi-ply thin paper with high drying efficiency and opacity while minimizing the decrease in strength. In conclusion, the drying energy of a multi-ply thin paper was expected to be reduced effectively by controlling the grade and mixing ratio of the pulps while minimizing changes in its physical properties rather than single-ply thin paper. - COLLAPSE
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Effect of Grade and Mixing Ratio of Pulps on the Physical Properties and Drying Efficiency of Multi-ply Thin Paper
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Research Article
- Analysis of Periodic Marks for Forensic Document Examination using Boosting Algorithms
- Chang Woo Jeong, Yong Ju Lee, Hyoung Jin Kim
- The increase in illicit activities, particularly financial crimes like bank fraud, tax evasion, counterfeit goods, and fraudulent schemes, is having an impact …
- The increase in illicit activities, particularly financial crimes like bank fraud, tax evasion, counterfeit goods, and fraudulent schemes, is having an impact on the national economy. In instances of such occurrences, it is imperative for a scientist to meticulously assess the pertinent documents in order to retain their evidential significance through non-destructive techniques. The 2D Lab Formation Sensor allowed for the differentiation of various types of copy paper through a non-destructive method. In this study, machine learning technologies were combined with a 2D Lab Formation Sensor to identify document paper for forensic purposes. Adaptive Boost, Gradient Boosting Machine, and Extreme Gradient Boost models were built. The XGBoost model outperformed the others, achieving an accuracy of 0.88. The periodic marks from the forming fabric serve as unique characteristics of each copy paper, depending on the manufacturer. - COLLAPSE
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Research Article
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Effect of Degree of Saponification and Molecular Weights of PVA on Properties of Low Density Foam-formed Sheets
PVA의 검화도와 분자량이 저밀도 폼포밍 시트의 물성에 미치는 영향
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Gwon-Hui Park, Byoung-Uk Cho
박권희, 조병욱
- The effects of saponification degree and molecular weight of polyvinyl alcohol (PVA) on foaming ability, foam stability, and strength of foam-formed sheets …
- The effects of saponification degree and molecular weight of polyvinyl alcohol (PVA) on foaming ability, foam stability, and strength of foam-formed sheets were investigated to evaluate the possibility of PVA for strength improvement of low-density foam-formed sheets. When used in combination with sodium dodecyl sulfate (SDS), the degree of saponification and molecular weight of PVA had no significant effect on the foaming ability of the fiber foam. However, the stability of the fiber foam was observed to improve with lower saponification degree and higher molecular weight of PVA above a certain level. Increasing the molecular weight and the added amount of PVA increased the bulk of the foam-formed sheet while decreasing the tensile strength. This is due to the fact that the added PVA contributed to the bulk improvement more by improving the stability of the fiber foam than by improving the interfiber bonding. In order to improve the strength of foam-formed sheets while maintaining low density, other methods need to be explored to increase the bond strength at the fiber-fiber interface. - COLLAPSE
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Effect of Degree of Saponification and Molecular Weights of PVA on Properties of Low Density Foam-formed Sheets
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Research Article
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Study of the Local Water Absorption Property of Three Dimensional Pulp Mold
3차원 구조 펄프몰드의 국부적 흡수특성평가 연구
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Chae Rin Song, Yoon-No Lee, Yong Joo Sung
송채린, 이윤노, 성용주
- This study investigated the structural variations in pulp mold, a promising alternative to non-degradable single-use products, and their impact on absorption properties. …
- This study investigated the structural variations in pulp mold, a promising alternative to non-degradable single-use products, and their impact on absorption properties. Pulp mold, made from natural fibers, are increasingly used as eco-friendly packaging solutions due to their recyclability and biodegradability. This research focused on the differences between the bottom and side structures of three dimensional pulp mold, examining how these differences affect their absorption characteristics. It was found that the bottom of the pulp mold samples, with a higher basis weight and lower bulk compared to the side, exhibited greater absorption capacity. Additionally the study developed a localized absorption test method to evaluate these structural variations more accurately. Experimental results showed that coating layers significantly improved the water resistance of pulp molds; however, non-uniform coating application due to structural differences led to variable resistance across the mold. The proposed localized absorption testing method effectively assessed the regional differences in absorption properties, offering a more precise evaluation compared to traditional methods. This research could contribute valuable insights into optimizing pulp mold production processes and enhancing the quality of eco-friendly packaging materials. - COLLAPSE
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Study of the Local Water Absorption Property of Three Dimensional Pulp Mold
Journal of Korea TAPPI
