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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General
- Sustainable Growth Strategy of the Paper Industry in the Artificial Intelligence Era
- Young Chan Ko, Hyoung Jin Kim, Jong-Moon Park
- The emergence of the Artificial Intelligence (AI) era has revolutionized every industry, causing some to decline or even disappear from the market. …
- The emergence of the Artificial Intelligence (AI) era has revolutionized every industry, causing some to decline or even disappear from the market. To develop a sustainable growth strategy in the AI era, the creation of a new paradigm is essential, grounded in the framework of constructive destruction. A simple paradigm shift will no longer suffice. The paper industry is no exception; if anything, its need for adaptation is even more pronounced. In the AI era, the industry faces a double-edged sword. On one hand, AI offers immense potential to drive sustainable growth through innovation and efficiency. On the other, it poses a significant risk of accelerating the industry’s decline if adaptation is delayed or inadequate. Innovative individuals with creative minds are crucial for driving sustainable growth. Notably, such individuals are unlikely to be replaced by AI technologies like robots. A sustainable growth strategy for the paper industry emphasizes the importance of working in harmony with AI technologies rather than competing against them. In this context, it is worth recalling the phrase, “a blessing in disguise.” - COLLAPSE
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Research Article
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Studies on the Traditional Hanji Made using A Papermaking Device Equiped with Deckle
가둠틀 초지도구로 제작된 전통한지에 대한 고찰
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Oh-Kyu Lee, Seokju Kim, Hyung Won Lee
이오규, 김석주, 이형원
- Despite the existence of proof, it has not been revealed whether or not Korean way of papermaking method using a device equiped …
- Despite the existence of proof, it has not been revealed whether or not Korean way of papermaking method using a device equiped with deckle exists for Hanji making. To prove the existence of it, the relation between papermaking method and the shape of filamentous materials in Hanji was investigated. For the investigation, the shape of the filamentous water silk in the Hanji called ‘Taeji’was analyzed. There were two categories of Taeji used in the investigation. One category was Taeji relics which were 10 letter relics written on Taeji in the 1700s to 1800s. The shape of filamentous water silk in the Taeji relics was mainly curved. The other category was Taeji made in 2019. In this category, there were two types of Taeji made by a papermaking device equiped with deckle and one without a deckle. Shape of filamentous water silk in Taeji made by a papermaking device equiped with deckle was curved, while that was linear in Taeji made by a papermaking device with no deckle. Similar results were obtained in the test to make Hanji with the mixture of Dak fiber and black silk thread. As a result, It has confirmed for the first time that the 10 letter relics written on Taeji were made by a papermaking device equiped with deckle. It refers that Korean way of papermaking method using a device equiped with deckle was existed before Japanese method flown in Korea. - COLLAPSE
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Studies on the Traditional Hanji Made using A Papermaking Device Equiped with Deckle
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Research Article
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Feature Importance Measures from Random Forest Regressor for Predicting Degree of Substitution in Cellulose Acetate
랜덤포레스트를 이용한 셀룰로오스 아세테이트의 치환도 예측 모델링과 변수 중요도 분석
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Yong Ju Lee, Ji Eun Cha, Geon-Woo Kim, Tai-Ju Lee, Jieun Lee, Sang-Jin Chun, Jaegyoung Gwon, Hyoung Jin Kim
이용주, 차지은, 김건우, 이태주, 이지은, 전상진, 권재경, 김형진
- The degree of substitution (DS) is the key parameter for characterizing cellulose acetate (CA). While DS is typically measured by titration, this …
- The degree of substitution (DS) is the key parameter for characterizing cellulose acetate (CA). While DS is typically measured by titration, this method is time consuming, labor-intensive, and requires hazardous chemicals. To provide an alternative, a random forest (RF) regression model was developed to predict the DS of CA using infrared spectroscopy. By deacetylation process, CA samples were prepared with DS values ranging from 0.45 to 2.85. The RF model was trained on spectral data in the region of 1500–800 cm-1, selected for its high feature importance, achieving an R2 of 0.988, consistent with the full spectral range (4000–600 cm-1). These results demonstrate that the RF model offers a robust, interpretable, and efficient approach for DS prediction in CA. - COLLAPSE
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Feature Importance Measures from Random Forest Regressor for Predicting Degree of Substitution in Cellulose Acetate
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Research Article
- Preparation and Properties of Silane-Modified Cellulose Nanofiber and Its Blended Bio-Polyurethane Based Composites Film
- Mikyung Kim, Songhyun Yoon, Jae Min Hyun, Jungeon Lee, Jae Hoon Jung, Seong Baek Yang, Yeasmin Sabina, Oh Kyung Kwon, Jeong Hyun Yeum
- This study focuses on enhancing nanocellulose dispersion in bio-polyurethane (B-PU) films through silane modification using methyltrimethoxysilane (MTMS). Analyzing wetting, chemical, thermal, morphological, …
- This study focuses on enhancing nanocellulose dispersion in bio-polyurethane (B-PU) films through silane modification using methyltrimethoxysilane (MTMS). Analyzing wetting, chemical, thermal, morphological, and dispersion properties of modified and unmodified cellulose nanofiber (CNF), the study demonstrates controlled MTMS conjugation, controlling diameter between 50–100 nm. Zeta potential values indicate improved Si-CNF dispersion stability in dimethylformamide. Scanning electron microscopy confirms enhanced dispersion in B-PU composites. Tensile strength increases by 23.52% at 1–2% Si-CNF but decreases (23.80–40.47%) at 4–8%. Si-CNF increases elongation by up to 4%, decreasing slightly at 8%. X-ray diffraction shows B-PU/Si-CNF 1wt.% has the highest crystallinity. Composite films exhibit improved thermal stability. This interaction offers a unique way to enhance Si-CNF and B-PU compatibility, promising applications in furniture coating, biomedical, and food packaging industries. - COLLAPSE
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Research Article
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Characterization of Cellulose Acetate-based Derivative Films with Addition of Polyethylene Glycol Using Breath Figure Array Method
Breath figure array 기법을 이용한 Polyethylene Glycol의 첨가에 따른 Cellulose Acetate 기반 유도체 필름의 특성 분석
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Sungoo Kim, Do Kyung Lee, Jin Ho Seo, Jaegyoung Gwon, Sang Jin Chun
김선구, 이도경, 서진호, 권재경, 전상진
- In this study, CA-based derivative (CA, CAP, CAB)/PEG films were prepared using Breath Figure Array (BFA) method, and the surface void characteristics …
- In this study, CA-based derivative (CA, CAP, CAB)/PEG films were prepared using Breath Figure Array (BFA) method, and the surface void characteristics of films formed by the types of CA, CAB, and CAP, as well as films with PEG formulation, were analyzed. For this purpose, the chemical properties of CA-based derivatives were compared, and CA-based derivative/PEG films were prepared using BFA method using a blade coater. The changes in pore size, arrangement, and uniformity were compared via FE-SEM on the film surface according to the type of CA-based derivative and the presence or absence of PEG addition. FT-IR results confirmed the differences in CA, CAP, and CAB due to the fatty acid chain length. TGA results showed that CA showed relatively high thermal stability. In the films with the addition of PEG, both CAP and CAB showed narrower pore size distributions and more uniform pore arrangements. - COLLAPSE
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Characterization of Cellulose Acetate-based Derivative Films with Addition of Polyethylene Glycol Using Breath Figure Array Method
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Research Article
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Evaluation of Filter Cloths Properties for Extracting Lignin from Black Liquor by Filter Press
흑액 기반 리그닌 추출을 위한 필터프레스 여과포 물성 평가
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Hyeon Ji Im, Jin-Woo Jang, Sukgon Yang, Sang Hun Lee, Sa Rang Choi, Jung Myoung Lee
임현지, 장진우, 양석곤, 이상헌, 최사랑, 이중명
- Lignin is the second most abundant natural biopolymer on Earth and is considered a potential alternative to replace petroleum-based compounds due to …
- Lignin is the second most abundant natural biopolymer on Earth and is considered a potential alternative to replace petroleum-based compounds due to its aromatic polymeric structure. As the demand for lignin as a feedstock for commercial usage increases, a robust lignin extraction technique from black liquor is essential. This study explores the properties of filter cloth to improve filter press performance for extracting lignin from acidified black liquors by increasing dewatering under high pressure. Although the nylon filter cloth has a higher tensile strength (4,400 N and 3,800 N) than the polypropylene filter cloth, the tensile strength of TSP-106 filter cloth made of polypropylene shows that it has the potential to withstand the high pressures during the filter pressing process. TSP-106 filter cloth also has a low air permeability, which increases the efficiency of filtering black liquor to collect lignin, suggesting that TSP-106 is applicable as a filter press filter cloth. - COLLAPSE
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Evaluation of Filter Cloths Properties for Extracting Lignin from Black Liquor by Filter Press
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Research Article
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Characteristics of Basepaper from Bamboo Pulps for Air Filter Application
대나무 펄프 기반의 공기 정화 필터용 원지 특성 평가
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Sa Rang Choi, Seung-Geun Kim, Jung Myoung Lee
최사랑, 김승근, 이중명
- As air pollution issues such as fine dust particles become increasingly severe, the consumption of air purification devices equipped with various types …
- As air pollution issues such as fine dust particles become increasingly severe, the consumption of air purification devices equipped with various types of filters has surged. Polypropylene (PP), commonly used as a filter material, is easy to process and exhibits excellent physical properties. However, its non-biodegradable nature makes recycling difficult, leading to secondary environmental pollution during landfills or incineration. To address this issue, this study fabricated high-basis-weight filter basepaper by mixing bamboo pulp produced via organosolv pulping with low melting point polyester (LMPET), polyethylene (PE)/polypropylene (PP) fibers, and activated carbon fibers using a wet-laid process on a pilot-scale paper machine. Analysis of the filter efficiency depending on the mixing ratio and basis weight revealed that the bamboo-based basepaper achieved up to 6% higher dust particle filtration efficiency for the 3.0–5.0 µm range and exhibited 40–50% lower differential pressure compared to PET Spunbond, commonly used as a filter substrate. Furthermore, the quality factor (QF), which comprehensively considers filtration efficiency and differential pressure, showed that bamboo-based basepaper achieved a value 2.3 times higher than PET Spunbond, demonstrating superior performance in air permeability and energy efficiency. These results indicate that environmentally friendly bamboo-based basepaper has the potential to reduce long-term operating costs and serve as an economical and sustainable carbon-neutral filter substrate, providing a viable alternative to conventional petroleum-based filter materials. - COLLAPSE
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Characteristics of Basepaper from Bamboo Pulps for Air Filter Application
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Research Article
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Preparation of Hydrogels Based on Carboxymethyl Cellulose with Electron Beam Irradiation
전자빔 조사를 이용한 친환경 하이드로겔의 제조 및 특성
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Sa Rang Choi, So Yeong Park, Hyeon Ji Im, Jin-hyeong Kim, Ji Hyun Park, Jung Myoung Lee
최사랑, 박소영, 임현지, 김진형, 박지현, 이중명
- Cellulose-based hydrogels possess excellent water absorption capabilities, non-toxicity, and biocompatibility, making them widely applicable across various fields. Using high-energy electron beam irradiation …
- Cellulose-based hydrogels possess excellent water absorption capabilities, non-toxicity, and biocompatibility, making them widely applicable across various fields. Using high-energy electron beam irradiation for crosslinking offers a simpler process than traditional thermal polymerization-based chemical crosslinking methods. It also provides sterilization benefits, resulting in time and cost efficiency. In this study, carboxymethyl cellulose (CMC) was mixed with citric acid (CA) and crosslinked using a low electron beam irradiation dose at 7 kGy to fabricate hydrogels. The effects of CMC concentration and CA on hydrogel properties were analyzed. Results showed that increasing the CMC concentration improved crosslinking efficiency, enhancing the 3-dimensional network structure. The addition of CA facilitated chemical crosslinking, leading to hydrogels with superior performance. Notably, the CMC10/CA sample exhibited a high gel fraction (68%), superior water absorption capacity (170 g/g), and excellent mechanical strength. These findings provide foundational data for the future development of green superabsorbent materials. - COLLAPSE
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Preparation of Hydrogels Based on Carboxymethyl Cellulose with Electron Beam Irradiation
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Research Article
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Optimization of Manufacturing Conditions for Radiation-Crosslinked Hydrogels- Part 1: Effects of Raw Material Mixing Ratios on Hydrogel Properties -
방사선 가교 기반 하이드로겔의 제조 조건 최적화 연구 - 제1보: 원료 혼합 비율이 하이드로겔 특성에 미치는 영향 -
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Sa Rang Choi, So Yeong Park, Hyeon Ji Im, Jin-hyeong Kim, Jung Myoung Lee
최사랑, 박소영, 임현지, 김진형, 이중명
- Carboxymethyl cellulose (CMC) is a promising feedstock candidate for producing eco-friendly, high-absorbency hydrogels. Electron beam irradiation (EBI) offers a safer and more …
- Carboxymethyl cellulose (CMC) is a promising feedstock candidate for producing eco-friendly, high-absorbency hydrogels. Electron beam irradiation (EBI) offers a safer and more efficient method for hydrogel formation without petrochemical-based crosslinkers. In this study, citric acid (CA) was used as a cross-linking agent to prepare non-toxic and environmentally friendly hydrogels by combining CMC and irradiating with a low dose (7 kGy) of electron beam. The central composite design (CCD) was applied to investigate the effects of CMC and CA concentrations for optimizing the water sorption ability of the hydrogels. The results indicated no gel was formed at CMC concentrations below 5%, while stable cross-linkings were achieved at concentrations above 9%. These conditions produced hydrogels with gel fractions exceeding 80%, water absorption capacities above 75 g/g, and excellent mechanical stiffness. - COLLAPSE
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Optimization of Manufacturing Conditions for Radiation-Crosslinked Hydrogels- Part 1: Effects of Raw Material Mixing Ratios on Hydrogel Properties -
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Research Article
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Study on Quality Improvement in Pulp Fiber Molding Through Coating Treatment
코팅 처리에 의한 펄프섬유몰딩 품질 개선 연구
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Yejin Shin, Yong Joo Sung
신예진, 성용주
- As environmental issues have intensified, pulp fiber molding products, an eco-friendly paper-based alternative to plastic products, are gaining attention. In order to …
- As environmental issues have intensified, pulp fiber molding products, an eco-friendly paper-based alternative to plastic products, are gaining attention. In order to expand the use of these molding products, such as for cushioning packaging materials, quality improvements are required, particularly in enhancing the surface structure. Therefore, this study investigated the quality improvement through the coating treatment of pulp fiber molding products. A spray coating process was applied for surface coating of pulp molds with a three-dimensional structure, and the physical properties of the coating solution and process conditions suitable for the spray coating process were evaluated. Furthermore, natural polymer-based starch coatings, latex, and biodegradable acrylic coatings were applied as coating agents, and their effects were compared and evaluated. When evaluating water resistance and oil resistance, the biodegradable acrylic coating showed the most excellent results, and its effect on improving moisture barrier properties was also assessed. It was confirmed that surface coating of pulp fiber molding could improve the quality of the products by enhancing water resistance, oil resistance, and moisture barrier properties. - COLLAPSE
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Study on Quality Improvement in Pulp Fiber Molding Through Coating Treatment
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Research Article
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Comparative Evaluation of Physical and Optical Properties of Hanji Coated with Korean, Chinese, and Japanese Ottchil Lacquer
옻칠 한지의 품질 특성: 한중일 옻칠의 물리적‧광학적 변화 분석
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Misuk Baek, Myung-Joon Jeong
백미숙, 정명준
- This study compares the effects of applying Ottchil lacquer from Korea, China, and Japan - three major East Asian producers - on …
- This study compares the effects of applying Ottchil lacquer from Korea, China, and Japan - three major East Asian producers - on physical, optical, and water-resistant properties of traditional Korean paper (Hanji). The solid content and viscosity of each country’s Ottchil lacquer significantly influenced the weight and thickness of coated Hanji, suggesting that variation in lacquer composition and manufacturing processes affect Hanji’s characteristics. Regarding color changes with repeated applications, Korean and Japanese Ottchil lacquers exhibited decreases in lightness and shifts toward greenish-blue, whereas Chinese lacquer retained more of its original red and blue tones. UV aging test demonstrated high UV stability in all three lacquers, with Korean lacquer showing the lowest ΔE value, indicating superior UV resistance. Contact angle measurements confirmed that a single lacquer application provided sufficient water resistance, with minimal additional benefit from multiple coatings. This study highlights the influence of national variations in raw Ottchil lacquer on Hanji’s performance and emphasizes its potential as a sustainable and durable coating material for both traditional and modern applications. The findings provide a basis for optimizing lacquer application processes to meet practical and artistic demands. - COLLAPSE
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Comparative Evaluation of Physical and Optical Properties of Hanji Coated with Korean, Chinese, and Japanese Ottchil Lacquer
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Research Article
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Effect of Color Materials on Aging Behavior of Hanji
채색 재료가 한지의 열화 거동에 미치는 영향
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Hyein Kim, Heenae Shin, Yeonji Kang, Min Kyung Kim, Yeachan Kim, Haena Jung, Inho Cho, Yonghoon Kwon, Hye Jung Youn
김혜인, 신희내, 강연지, 김민경, 김예찬, 정해나, 조인호, 권용훈, 윤혜정
- Hanji, a traditional Korean paper, has been served as the primary base material for oriental paintings. In recent years, modern colored paints, …
- Hanji, a traditional Korean paper, has been served as the primary base material for oriental paintings. In recent years, modern colored paints, along with traditional ink, have also been applied in oriental painting, but research on their aging stability remains limited. This study evaluates the aging stability of two types of Hanji commonly used in art, treated with ink, acrylic paint, tube paint, and powdered pigment. For acrylic paint, both diluted and undiluted paints were applied to examine the effect of concentration. Accelerated aging were conducted under humid and dry conditions, and changes in L*, a*, b* values, brightness, tear strength, folding endurance, and water contact angle were measured. The results showed that dry aging caused more significant changes than humid aging. Neither the presence and type of color materials nor acrylic paint concentration significantly affected color changes during aging. Colorant treatment reduced the tear index, but rather improved folding endurance, especially in the relatively lower grade Hanji. Among the paint types, tube paint showed the highest reduction in tear strength and folding endurance, indicating lower aging stability. Acrylic paint exhibited lower contact angles and faster droplet penetration than other color materials, regardless of aging method and Hanji type. Concentrated acrylic paint was advantageous for tear strength but unfavorable for folding endurance, with no changes in contact angle due to aging. Consequently, the aging behaviors of Hanji treated with modern colorant materials was similar to that of ink, showing sufficient potential for use as a color material for oriental painting. - COLLAPSE
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Effect of Color Materials on Aging Behavior of Hanji
Journal of Korea TAPPI
