• Fibers and Polymers
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• 제7권4호
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• pp.352-357
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• 2006

The cotton fabrics were pretreated by sodium 2-(2,3-dibromopropionylamino)-5-(4,6-dichloro-1,3,5-triazinylamino) benzenesulfonate (DBDCBS) at alkaline condition ofroom temperature and then dyed with four disperse dyes having amino groups (C.I. Disperse Yellow 9, C.I. Disperse Red 11, C.I. Disperse Blue 56 and C.I. Disperse Violet 1) at acidic condition of high temperature. A novel hetero-bifunctional bridge compound, DBDCBS, has two reactive groups such as dichloro-striazinyl group and ${\alpha},\;{\beta}$-dibromopropionylamido group. The first has reactivity towards hydroxy group of cellulosic fiber and the second shows reactivity towards amino groups of disperse dye containing amino groups. The results indicate that it is possible to dye polyester/cotton blend at one-bath dyeing using one kind of disperse dye containing amino groups. Therefore, two kinds of dyeing methods such as two-bath process one-bath dyeing and one-bath process one-bath dyeing were investigated and their dyeabilities were compared. The differences between these two methods were negligibly small so that perfect one-bath one-step dyeing of polyester/cotton blend by one kind of disperse dye was achieved.

• 한국응용과학기술학회지
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• 제27권2호
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• pp.168-174
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• 2010

In this research, an effective method for reducing the fibrillation of lyocell fibers, which are spun from a solution of cellulose in N-methyl morpholine-N-oxide(NMMO), through consecutive chemical treatments. Undried solution-spun cellulosic fiber was firstly treated with 10 to 30 wt% of multifunctional crosslinking agents, such as ethylene glycol poly(3-chloro-2-hydroxypropyl) ether, and then dipped into alkaline solution to introduce epoxy functions. Finally steam condition was applied to occur a chemical crosslinking in order to reduce the fibrillation on the surface of fibers. Fibrillation was also reduced significantly by adding extra $Na_2SO_4$ in NaOH solution. In addition, Antifibrilllated lyocell fibers show the slightly higher dyeability(4 %) to Cibacron Blue without serious reduction of mechanical properties.

• 한국태양에너지학회 논문집
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• 제28권4호
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• pp.10-16
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• 2008

The fire resistance of thermal insulation and interior finishing materials is recently much emphasized after the fire accident at the Icheon Cold Store in January 2008. Three kinds of thermal insulation are used in buildings. They are Organic, Non-organic and cellulosic insulation. Organic insulation such as polystyrene foam board and urethane foam has high thermal resistance but it has no fire resistance. While non-organic insulation such as rockwool and glassfiber has high fire resistance, it has lower thermal resistance than organic insulation. Cellulose insulation is primarily manufactured from recycled newsprint or cardboard using shredders and fiberizers. Despite of its environmental friendliness and high thermal resistivity, its domestic use has not much increased because of the prejudice that paper can easily burn. However, the cellulose insulation as a product is about 80 wt.% cellulosic fiber and 20 wt.% chemicals, most of which are fire retardants such as boric acid and ammonium sulfate. It is required to secure its fire safety for more consumption as a building insulation in Korea. Therefore, this study investigates the fire resistance of Korean cellulose insulation according to the rate of fire retardant and finally presents the optimum rate of fire retardant in cellulose as building insulation. The fire safety test was conducted according to the ASTM C 1485-00. The test results indicate that above 18 wt% of fire retardant is necessary to secure the fire safety of cellulose insulation.

• 대한환경공학회지
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• 제35권10호
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• pp.743-748
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• 2013

본 연구의 목적은 수분이 함유된 한지의 수분을 에탄올, 메탄올, 펜탄 등과 같은 비극성물질로 치환하여 한지 여과지를 만드는데 있다. 실험은 적정 비극성물질의 선택 및 적정 건조방법 그리고 제조된 한지여과지의 물리화학적 특성을 알아보기 위하여 수행되었다. 한지 종이필터를 제조하기 위하여 한지에 함유된 수분을 치환하기 위한 최적 물질은 에탄올이었으며 적정한 건조방법은 냉동 후 진공에 의해 수분을 건조하는 냉동건조방법이었다. 냉동건조에 의해 제조된 필터의 겉보기 밀도는 0.11-0.13 g/mL 으로 자연건조방법의 절반 이었으며 공극율은 약 90%로서 다공성을 나타내었다. 전자현미경 관찰결과 자연건조 및 열건조에 의해 제조된 여과지의 섬유는 섬유끼리 매우 가깝게 밀착되어 있었으나 냉동건조에 의해 제조된 섬유는 섬유간에 간격이 이격되어 있었다. 제조된 여과지의 압력손실은 자연건조 및 열건조 여과지보다 냉동건조에 의해 제조된 한지가 매우 낮았으며 BTEX제거효율은 한지의 수분을 비극성 물질에 의해 치환한 것보다 자연건조시킨 한지가 우수하였다.

• 펄프종이기술
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• 제42권2호
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• pp.53-60
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• 2010

Kudzu vine (Pueraria lobata) is a perennial plant and spreads all around in South Korea. Recently the use of leaves, stems and roots of kudzu vine has been investigated in many fields. However, the research on kudzu fibers has not been performed in korean pulp and paper industry. As the stems and roots of kudzu were estimated to contain cellulosic fibers, the possibility of producing a raw material from kudzu fibers in pulp and paper mills was investigated in this study. The stems and roots of kudzu were collected in woods, and then the chemical composition and ash contents was measured. To acquire kudzu pulp, kraft pulping and bleaching of kudzu roots were carried out sequently. After making kudzu pulp, freeness and fiber length were measured, and handsheets was also prepared with kudzu pulp and the properties of handsheets were determined. Consequently, kudzu fibers have lower holocellulose contents than wood fibers and other non-wood fibers. Average fiber length is shorter than that of Sw-BKP, but shows the same level as that of Hw-BKP. The handsheet made from kudzu pulp shows the bulkier structure than those made from Hw-BKP and Sw-BKP.

• 복식
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• 제18권
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• pp.283-289
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• 1992

In this paper, dyeing properties and colorfastness of ramie, flax, and cotton fabrics for direct dyes were compared. When dyed in a same liquor-goods ratio, in case of green dyes, colorfastness to light was similar for three fibers but in case of red dyes, cotton had a lower level. For colorfastness to laundering, there fibers were similar and three were no consistent differences. The degree of stain about white cotton fabric was higher in case of red dyes and it showed the difference of dye's properties. The degree of stain about white wool fabric showed the highs resistance or stain and little stain was seen. This result represented that the dyes. used were proper direct dyes for cellulosic fibers. For the difference of shade, the cotton was consistently brighter and the shade of ramie was darker than that of cotton and flax. This might mean that optical effects arose from the comparatively large cross-sectional size of the ramie fiber and its highly oriented structure.

• 한국염색가공학회지
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• 제16권2호
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• pp.47-51
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• 2004

A differential refractive index detector was used for monitoring glucose contents in textile processing solutions. The sensitivity of the device was high enough to measure 0.05％ aqueous glucose solution that could not be measured by normal refractive index measurement. The device was set to monitor glucose concentration continuously in real time by measuring differential refractive index and calibrated by standard glucose solutions in a range of 0.1 to 1.0%. The possibility of industrial application of the device was demonstrated by real-time monitoring of glucose concentration in textile processing solutions such as desizing bath and cellulase treatment bath. Both of solutions contained glucose as a major degraded product. The device would be able to control the weight loss of cellulosic fiber during cellulase treatment since the amount of degraded products in a processing bath is proportional to its weight loss.

• 대한가정학회지
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• 제19권4호
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• pp.9-15
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• 1981

damages of cotton cloth and characteristics of fabroid degradation were studied by Chaetomium globosum and Aspergillus niger which presupposed as powerful erosive fungi to cellulose fiber by means of tensile strength. The results obtained are as follows: 1. the growth(rate) of fungi in malt extract agar was superior to potato agar for two weeks. 2. Chaetomium globosum showed mostly severe damage t the cotton cloth in malt extract agar media at pH 4.5. 3. Tensile strength was reduced with time by Aspergillus niger-coenzyme and Chaetomium globosum-coenzyme reaction. In comparison with Chaetomium globosum and Aspergillus niger, the former weaken tensile strength about 15.8% and the latter enfeebled 10.0% after 124 hours. 4. after 30 days the breeding of fungi in pH 4.5 malt extract agar media, critical damage of cotton cloth was observe, I. e., 92.4% damage by chaetomium globosum and 74.9% lose by aspergillus nige respectively.

• Fibers and Polymers
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• 제7권3호
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• pp.241-244
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• 2006

In this paper, the effect of cellulase treatment was evaluated by means of phenol-sulphuric acid method. This method was performed by determining sugar liberation in the treatment bath with the amount expressed in glucose equivalent. As compared with conventional method, the measurement of amount of sugar liberated gave a more reliable and accurate result than the weight loss method. It was found that although the weight loss of cellulose became negligible when the treatment was done under agitation-free condition, the amount of sugar liberated was still readily measurable.

• 한국생활과학회지
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• 제7권2호
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• pp.75-80
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• 1998

In this paper, deying properties and colorfastness of ramie, flax, and cotton fabrics for direct dyes were compared. When dyed in a same dyeing bath ratio, in case of green dyes, colorfastness to light was similar for three fabrics but in case of red dyes, cotton had a lower level. For colorfastness to laundering, three fabrics were similar and there were no consistent differences. The degree of stain about white fabric cotton was highest in case of red dyes. The degree of stain about white fabric wool showed the high resistance of stain and little stain was seen. This result represented that the used dyes were proper direct dyes for cellulosic fibers. For the difference of shade, the cotton was cosistently brighter and the shade of ramie was darker than of cotton and flax. This might mean that optical effects arouse from the comparatively large cross-sectional size of the ramie fiber and its highly ordered structure.