• Korean Chemical Engineering Research
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• 제48권1호
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• pp.121-127
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• 2010

본 연구의 목적은 효소법을 이용한 바이오디젤의 생산에서의 효소(lipase) 활성화를 최적화함에 있다. 효과적인 방법으로 효소를 고정하기 위해 방사선 그라프트 중합법을 이용한 부직포에 음이온 교환기인 ethanolamine과 diethylamine을 도입시켜 음이온 교환 부직포(이때 얻어진 부직포는 EtA, DEA-EtA 부직포라 함)를 합성하였다. 기존에 사용하던 다공성 중공사막의 경우 시간이 지남에 따라 막힘 현상에 따라 유속이 현저하게 줄어드는 점을 보완하고자 기공(pore size)이 $300{\mu}m$인 부직포를 선택하였다. 이 부직포에 음이온 교환기가 도입된 EtA, DEA-EtA 부직포의 최적효소 흡착 특성과 효소 활성도에 대하여 고찰하였다. 그 결과 효소 흡착량은 EtA, DEA-EtA 부직포가 비슷하였으나(EtA non-woven fabric: 15.69 mg/g, DEA-EtA non-woven fabric: 14.45 mg/g) 기름을 투과시킨 결과 효소 활성화는 DEA-EtA 부직포가 EtA 부직포에 비해 현저히 떨어짐(EtA non-woven fabric: $3.50mol/h{\cdot}kg$, DEA-EtA non-woven fabric: $0.38mol/h{\cdot}kg$)을 알 수 있었다. 이 음이온교환기를 이용해 효율적인 바이오디젤 생산을 위한 온도, 효소고정량, 기름과 알코올과의 관계 등의 최적의 조건을 도출하였다.

• 한국염색가공학회:학술대회논문집
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• 한국염색가공학회 2008년도 제38차 학술발표대회
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• pp.86-88
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• 2008

Dyeing and fastness properties of direct spun type PET microfiber velvet woven fabric have been compared with those of regular PET velvet woven fabric. They showed different exhaustion and rate of dye uptake. The build-up properties of disperse dyes on direct spun type PET microfiber velvet woven fabric were relatively poor than regular PET velvet woven fabric. The wash fastness properties of disperse dyes on regular PET velvet woven fabric were similar to direct spun type PET microfiber velvet woven fabric.

• International Journal of Industrial Entomology and Biomaterials
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• 제44권1호
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• pp.12-20
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• 2022

In this research, the silk web was hot-pressed for various times, the effect of press time on the structure and mechanical properties of silk non-woven fabric was also investigated. The yellowing appeared in the silk non-woven fabric and became more apparent as press time was increased. The crystallinity of silk was decreased by the hot press treatment and it did not change significantly with an increase of hot press time. The porosity of silk non-woven fabric was constantly decreased until 120 s and it did not change much after that. The thickness of silk non-woven fabric was significantly decreased by a press time of 10 s and slightly decreased with a further increase of hot press time. The hot press treatment increased the maximum stress and elongation of silk non-woven fabrics. The press time had a significant impact on the mechanical properties of silk non-woven fabric, with 90 s being the optimum condition for the best work of rupture of silk non-woven fabric.

• 한국의류산업학회지
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• 제16권2호
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• pp.319-325
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• 2014

This article describes a method for producing chitosan non-woven fabrics by just hot pressing without the use of a binder. A study has been made of the wet spinning of chitosan fiber. The fibers were rinsed thoroughly in running water and chopped wet into staples of with a length of approximately 5-10 mm. The chopped chitosan staples were dispersed uniformly in water and fabricated using a non-woven making machine. This study examined the formation and the characteristics of chitosan non-woven fabrics manufactured by hot pressing without the use of a binder. The effects of the non-woven fabrication conditions on the thermal, morphological, structural, and physical properties of chitosan non-woven fabric with and without water as a plasticizer were studied. The temperature of the exothermic peak, decomposition of chitosan fibers increased with increasing heating rate. Water in the chitosan fiber effectively plasticized the chitosan fiber. The thermal bonded structure of the wet chitosan fiber with water as a plasticizer was clearly found in many parts of the non-woven fabric at a fabrication temperature of $200^{\circ}C$. The intensity and profile of the (100) plane($2{\theta}=10.2^{\circ}$) and (040) plane($2{\theta}=20.9^{\circ}$) in the chitosan non-woven fabric decreases and became smooth in the non-woven fabric formation by melting.

• 한국토양비료학회지
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• 제48권6호
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• pp.671-676
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• 2015

Control of surface runoff from upland soil is essential to reduce nonpoint source pollution. The use of non-woven fabric as a soil cover can be helpful to control surface runoff. The field experiment was conducted to evaluate the furrow cover effects of black non-woven fabric on the nutrient discharge from upland soil used for red pepper cultivation. The experimental plots consisted of chemical fertilizer (CF), cow manure compost (CMC), and pig manure compost (PMC) treatment. Each nutrient material treatment plot has control (no furrow cover (NFC)) and black non-woven fabric cover treatment, respectively. The amount of nutrient application was chemical fertilizer of $190-112-149(N-P_2O_5-K_2O)kgha^{-1}$, cow manure compost of $29.5tonha^{-1}$, and pig manure compost of $7.9tonha^{-1}$ as recommended amount after soil test for red pepper cultivation. Compared to control (NFC), furrow cover treatment with black non-woven fabric reduced the amount of T-N discharge by 50% at CF treatment, 36.9% at CMC treatment, and 44.8% at PMC treatment. Furrow cover treatment with black non-woven fabric reduced the amount of T-P discharge by 37.1% at CF treatment, 49.9% at CMC treatment, and 63.4% at PMC treatment compared to control (NFC). The production of red pepper did not show significant difference. There was no weed occurring in furrow cover treatment plots with black non-woven fabric. Results from this study showed that the furrow cover with black non-woven fabric could play a significant role in reduce nutrient discharge from upland soil used for red pepper cultivation.

• 대한본초학회지
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• 제25권1호
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• pp.9-12
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• 2010

Objectives : To evaluate the extraction efficiency of water decoction with or without non-woven fabric underlying comparison of the HPLC (high-performance liquid chromatography) profiles of the hesperidin which is the standard of Citri Pericarpium. Methods : Pyungwisan, which is comprised of Atractylodis Rhizoma, Magnoliae Cortex, Citri Pericarpium, Glycyrrhizae Radix, Zingiberis Rhizoma, and Ziziphy Fructus, was extracted in boiling water with non-woven fabric or without non-woven fabric. Then hesperidin content was analyzed by HPLC. Results : The contents of hesperidin in the water extract of Pyungwisan which was decocted without non-woven fabric showed $219.57{\pm}2.51\;mg/g$ and $138.90{\pm}6.32\;mg/g$ in with non-woven fabric decoction. Conclusions : These results suggest that herbal decoction without non-woven fabric might increase extraction efficiency.

• 한국자원식물학회지
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• 제13권2호
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• pp.111-117
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• 2000

포도 품질을 높일 수 있고, 숙기 판단 노력을 절감할 수 있는 봉지 재료를 선발하고자 1997년부터 1999년까지 3년간에 걸쳐 충청북도 농업기술원 옥천포도시험장에서 시험한 결과를 요약하면 다음과 같다. 봉지내의 광 투과율은 종이 봉지에 비하여 부직포 및 무적비닐 이용 봉지에서 11∼65%가 높았으나, 무적비닐 천공 상면 50% 흰색 페인팅 봉지는 25% 낮았다. 과립중은 종이봉지에 비하여 부직포와 무적비닐이용 봉지에서 무거웠으며, 무적비닐 천공 상면 50% 흰색 페인팅 봉지는 열과, 탈립 및 부패과가 심하여 조사가 불가능하였다. 숙기는 종이봉지에 비하여 부직포와 무적비닐 이용 봉지에서 1∼4일 빨랐다. 당도는 부직포와 무적비닐 이용 봉지에서 높은 경향이었으나, 산도는 상반된 경향이었다. 착색정도는 종이 봉지에 비하여 부직포와 무적비닐 이용 봉지에서 빨랐으며, 이들 봉지간에는 착색 정도는 맥반석 혼합 부직포와 무적비닐+부직포 봉지에서 빨랐으나, 적숙기로 가까워질수록 부직 포봉지에서 빨랐다. 비정상 과립율은 종이와 부직포 봉지는 5.4∼7.0%로 낮았으나, 무적비닐 이용 봉지는 16.6∼100%로 높았다. 외관상품질은 부직포와 맥반석 혼합 부직포에서 지수 9.0으로 가장 좋았으나, 무적비닐 천공 상면 50% 흰색 페인팅 봉지는 지수 1.0으로 가장 불량하였다. 숙기 판단 소요시간은 종이(17.4시간/10a)에 비하여 부직포와 무적비닐 이용 봉지에서 74∼93% 절감되었다.

• Fibers and Polymers
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• 제7권1호
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• pp.79-84
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• 2006

This paper deals with the grey fabric deformation during relaxation. It investigates the effect of twist direction and twist liveliness on the 2/2 twill weave woven fabric distortion, during relaxation This experimental work shows that twist liveliness increases the natural tendency of the twill weave woven fabric to skew. In addition when the twist direction of the warp and weft is opposite to each other the bias curling occurs too.

• 한국의류학회지
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• 제25권7호
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• pp.1193-1202
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• 2001

The goal of this research is to investigate the effect of fusible interlinings on the mechanical characteristics and appearance related values for the Lyocell fabrics. In this study, to establish optimum fusing conditions, peel strength of the fused fabrics depending on the fusing temperature, pressure and time was measured. Appearance related properties and mechanical characteristics of the fused fabrics ere determined. The reulst are as follows: In the fusing condition of $120^{\circ}C,\;3kgf/textrm{cm}^2$, 15sec, peel strength was excellent. Peel strength was excellent in the case of tencel/cotton fabric, with increasing cover factor of woven interlining, with twill and nonwoven interlining. Flex stiffness was increased in the case of tencel/cotton fabric, with increasing weight of woven interlining, with twill and nonwoven interlining. Drapability was excellent in the case of 100% tencel fabric, with decreasing weight of woven interlining, with plain and woven interlining. Crease recovery was excellent in the case of 100% tencel fabric, with increasing weight of woven interlining, with twill and woven interlining. Shear and bend properties were increased in the case of tencel/cotton fabric, with increasing weight of woven interlining, with plain and nonwoven interlining.

• 한국의상디자인학회지
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• 제24권1호
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• pp.35-43
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• 2022

This study aims to analyze the physical properties of non-woven fabric sheets, which continue to grow in the cosmetic market. Non-woven fabric sheets were used as specimens, and a total of 17 samples were analyzed. To evaluate the physical properties of the non-woven fabric sheet, the weight, tensile strength, surface properties, free swell absorption, and wet stiffness were tested. Through the results itw was determined that non-woven fabric sheets for mask packs should be manufactured considering fiber arrangement so that the weight is 40 g/m², and the tensile strength should be maintained near 12 kgf. In addition, it was confirmed that the material selection and process conditions should be adjusted so that the free swell absorption is at least 8 g/g, and the wet stiffness is 200 mg. Therefore, since the non-woven fabrics for the mask sheets can be used in various products depending on fabric composition, this study will be expected to be basic data for the continuous growth of the sheet-type mask packs coming to market.