• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 2006년도 PAN PACIFIC CONFERENCE vol.2
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• pp.373-379
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• 2006

Fiber characteristics and fiber distribution of thermomechanical pulp(TMP), bisulfite chemithermomechanical pulp(bisulfite CTMP), neutral sulfite chemithermomechanical pulp(neutral sulfite CTMP) from kenaf(Hibiscus cannabinus L., Malvaceae) cultivar Tainug-2 cultivated in the reclaimed land of Korea were examined to use effectively nonwood fibers as an alternative raw material sources for papermaking. Yields of TMP and CTMP from kenaf were lower than those of TMP from hardwoods and CTMP from softwoods and hardwoods. Bark fibers of kenaf cultivar Tainung-2 ranged 2.04 to 2.30 mm long and $18.7{\sim}19.7{\mu}m$ width. Core fibers averaged 0.63 to 0.80 mm long and $29.5{\sim}31.4{\mu}m$ wide. Coarseness of bark fiber was higher than that of core fiber, and fiber from TMP were higher than those from both bisulfite CTMP and neutral sulfite CTMP. Curl indexes of bark fibers were higher than those of core fibers. However curl indexes were not significantly affected by the pulping conditions. Short fiber distributions were higher in core fibers from TMP and CTMP and long fiber distributions were higher in bark fibers. There was no significant difference in fiber distribution of whole and core fibers obtained from TMP and CTMP, Fibers from neutral sulfite CTMP, however, exhibited a little higher long fiber distribution. Distinct difference in anatomical characteristics was found between core and bast fibers of kenaf plant. Parenchyma cell, pith parenchyma cell and vessel were observed in core fibers and bast fiber in bast sections.

• 펄프종이기술
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• 제39권4호
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• pp.45-52
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• 2007

Whole, bast and core fibers of kenaf cultivar Tainung-2 were pulped under different pulping methods, thermomechanical and kraft pulping methods. The physical and optical properties of kenaf TMP(thermomechanical pulp) and KP(kraft pulp) handsheets were investigated and the results from the study are summarized as follows: Yields of TMP and KP were $77{\sim}87%\;and\;43{\sim}52%$, respectively. There was no significant change in apparent density between kenaf KP and USKP(unbleached softwood kraft pulp) but TMP showed a little lower apparent density. Bast pulp had the lowest apparent density regardless of pulping methods. Tensile strength of kenaf KP was higher than that of TMP but similar to that of USKP. Both TMP and KP handsheets of bast fraction showed the highest tear strengths among whole, bast, and core fractions. Core fraction showed the lowest tear strengths under different pulping methods. In general burst strength of kenaf pulp under different pulping methods was lower than that of USKP, and kenaf pulp had better stiffness than USKP. Brightness of kenaf KP and TMP was higher than that of USKP. There was no significant variation in opacity between kenaf pulp and USKP even though kenaf pulp showed a little lower opacity. The main difference in paper quality between the core fiber and bast fiber is derived from the fact that bast fiber is long and thin, whereas core fiber is short and thick.

• 접착 및 계면
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• 제19권2호
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• pp.60-67
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• 2018

본 연구에서는 친환경 천연섬유인 케나프의 표면을 Chemlok 402를 함유하고 있는 접착용액으로 전처리하였을 경우, 케나프/천연고무 복합재료의 경화거동, 경도, 인장특성 그리고 마모특성에 미치는 섬유 표면처리 유 무, 섬유함량 및 섬유길이의 영향을 조사하였다. 복합재료를 구성하는 케나프섬유 함량은 평균 케나프섬유의 길이가 약 2 mm로 일정한 상태에서 각각 0, 5, 10, 15, 20 phr로 달리하였다. 또한 섬유함량이 5 phr로 고정된 상태에서 평균 섬유길이는 각각 2 mm, 35 mm, 70 mm로 달리하여 각 특성을 비교하였다. 천연고무 복합재료의 경화거동을 나타내는 Tmax 값과 tc90 값, Shore A 경도, 인장탄성률 그리고 마모저항성은 케나프섬유 함량과 길이에 크게 의존하였다. 이러한 특성들은 케나프섬유의 표면을 접착용액으로 전처리한 경우가 처리하지 않은 경우보다 더 우수한 특성을 나타냈다. 이러한 현상은 전처리된 케나프섬유와 고무매트릭스 사이의 계면접착 상태가 개선되었기 때문이다. 본 연구결과는 천연섬유강화 복합재료의 물성을 향상시키기 위해 접착용액의 적절한 사용이 가능하다는 것을 제시하여 준다.

• 기술사
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• 제10권3호
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• pp.17-26
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• 1977

In order to obtain the most practical and economically efficient method for refining of kenaf fiber and the production possibility of bag dproucts by using kenaf, Various chemicals and conditions of treatment for refining of kenaf bark were examined. Refining by the retting method was found much beneficial in quality of fiber and in processing cost than the chemical mettled. Bag products by using kenaf bark has good quality , and for practical use, Even if the production cost is slightly more expensive than jute bag, it could be reduced by planned mass production.

• 펄프종이기술
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• 제40권4호
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• pp.1-9
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• 2008

The utilization of non-woody fibers with the fast growing annual plants has occurred in the paper industry to replace wood and preserve environment of the earth. The non-woody fibers generally used for papermaking are paper mulberry, gampi, manila hemp, rice straw, bamboo, and coton linter etc.. Recently Kenaf has been spot-lighted for the same application. Kenaf is an annual plant of Hibiscus species of Malvaceae family. Kenaf, a rapid growing and high harvesting non-woody fiber plant, was identified as one of the promising fiber sources for the production of paper pulp. This study was carried out to investigate the pulping characteristics of Kenaf bast fiber for Hanji (traditional Korean paper) manufacturing by different pulping methods, such as alkali, alkali-peroxide and sulfomethylated pulpings. It was possible to make superior grade of Hanji. Especially sulfomethylated pulping was resulted in superior pulp in terms of higher yields and qualities in comparison to those of the other pulping methods. Hanji from sulfomethylated pulp was shown the highest brightness of over 60% and higher sheet strength. In addition, the morphological features of pulp fibers (pulp compositions) affect to the sheet properties. Therefore the effect of fiber distribution index(FDI) which was calculated from the data of Confocal laser scanning microscopy(CLSM) on the sheet properties of Kenaf Hanji was also discussed.

• 펄프종이기술
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• 제35권4호
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• pp.68-74
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• 2003

Kenaf(Hibiscus cannabinus L.) cultivar, Tainung 2, had been grown for 152 days at the experimental farm of Jinju National University, Gajoa-dong, Jinju-si, Kyongnam, Korea. The planting, growth rate, fertilization and structural characteristics as well as the cultivation and growth characteristics of kenaf, and the product usage were investigated. The narrowest diameter at kenaf bottom was 10 mm, the widest 42 mm and the average about 28 mm, and the shortest height 150 cm, the tallest 480 cm and the average about 350 cm. The weight of a core fraction was 68.1％ and a bast fraction 31.9％. The weight ratio of core material to bast fiber was 2.31. The weight ratio of dry stem was 73.5％ and that of leaves 26.5％. The weight of dry plant produced in 1 $m^2$ was 1,467 g, and about 1,052 g of stem could be used for the commercial purpose, The application of fertilizers resulted in the increase of the growth rate of the diameter at plant bottom and the height. Bast fiber, phloem ray and cortex parenchyma cell were observed in bast, and vessel, wood fiber and ray in core.

• Fibers and Polymers
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• 제7권1호
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• pp.26-29
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• 2006

Samples of kenaf (Hibiscus cannabinus) grown in Malaysia were examined to determine the kraft pulp and paper-making properties of their bast (or bark) fibers. Using kraft pulping process showed that bast fibers were relatively easy to cook resulting good pulp yields in the range of 45-51 %. The bast pulp produced sheets with great density, tear index and dry zero-span breaking length. Kenaf bast fiber is considered promising for production of high-grade printing, writing and specialty papers.

• Elastomers and Composites
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• 제46권2호
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• pp.125-131
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• 2011

일정한 길이로 분쇄한 케냐프섬유를 일정한 비율로 PP수지에 복합화하여 섬유의 함량에 따른 기계적특성을 조사하였다. 케냐프 섬유의 함량이 증가할수록 인장강도, 굴곡탄성률, 충격강도, 비중, 열변형온도가 증가하는 경향을 나타내었으나 신장률, 굴곡강도, 용융유동지수는 감소하는 경향을 나타내었다. 기계적물성증가의 원인은 섬유와 PP간의 계면접촉면적의 증가와 섬유간의 연결간섭으로 고찰되었다. 케냐프섬유내에 존재하는 증발성추출물질이 PP와 의 계면접착에 있어서 감소에 영향을 미치는 것으로 고려된다.

• 한국염색가공학회지
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• 제32권4호
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• pp.274-280
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• 2020

This study compared the mechanical properties of bamboo fiber composites and kenaf fiber composites through physical treatment (ultrasonic treatment). Kenaf, a composite of PP reinforced with bamboo fiber, was made using injection molding technology. PP was used as a binder and the ultrasonic treatment time of bamboo and kenaf was increased by 30 minutes to compare and study various mechanical properties of bamboo and kenaf composites through physical treatment. Interfacial properties such as internal cracks and internal structure of the wave cross section were confirmed using a scanning electron microscope (SEM). As a result of the ultrasonic treatment, most of the characteristics were fragile as the ultrasonic treatment time was increased, and it was confirmed that the natural characteristics of the twisted fibers had a great influence on the characteristics of the composite material.

• 접착 및 계면
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• 제9권4호
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• pp.1-11
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• 2008

본 연구에서는 바이오복합재료 성형 전에 침지방법과 초음파방법을 이용하여 수산화나트륨 용액으로 kenaf 섬유를 처리하였다. Kenaf/poly(lactic acid)의 kenaf-PLA 계면접착력과 기계적, 열적 특성에 미치는 알칼리처리의 영향을 계면전단강도, 굴곡강도, 동역학적 열특성 및 열안정성을 조사하였으며, kenaf 섬유와 복합재료 파단면을 관찰하였다. 그 결과 Kenaf 섬유표면을 처리하기 위한 침지방법과 초음파방법 모두 바이오복합재료의 섬유-매트릭스 접착과 기계적 특성을 증가시키는 역할을 하는 것으로 조사되었다. 바이오복합재료의 특성은 섬유표면 처리방법뿐만 아니라 알칼리 농도 및 처리시간에도 의존하였다.