• Title/Summary/Keyword: super fiber

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Cellulose계 섬유의 새로운 전망

  • Cho, Hwan
    • Textile Coloration and Finishing
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    • v.6 no.2
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    • pp.63-70
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    • 1994
  • 최근, Courtaulds Fiber Ltd.사에 의해 개발된, 새로운 용제방사(瑢劑紡絲) cellulose fiber인 Tencel에 대한 관심이 고조되고 있다. 이 글에서는, 먼저 Tencel의 고기능 특성을 cellulose섬유의 구조적 성질과 관련지어 언급코져 한다. 다음으로, 중공섬유막(hollow fiber membranes), sponge, 부직포와 bacterial cellulose, 그리고, 그 들 cellulose로부터 유래된 새로운 상품과 그 응용의 광범위한 분야를 서술하고져 한다. 그 외에, cellulose fibers와 fabric에 대한 가능성 후처리기술들의 최근의 동향도 기술하고져 한다. 끝으로, 생분해성 plastic과 super섬유로서의 cellulose의 특성, 그리고 장래 그들의 기술적 전망도 부언하고져 한다.

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Water Repellency on a Nanostructured Superhydrophobic Carbon Fibers Network

  • Ko, Tae-Jun;Her, Eun-Kyu;Shin, Bong-Su;Kim, Ho-Young;Lee, Kwang-Ryeol;Hong, Bo-Ki;Kim, Sae-Hoon;Oh, Kyu-Hwan;Moon, Myoung-Woon
    • Proceedings of the Korean Vacuum Society Conference
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    • 2012.08a
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    • pp.224-224
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    • 2012
  • For decades, carbon fiber has expanded their application fields from reinforced composites to energy storage and transfer technologies such as electrodes for super-capacitors and lithium ion batteries and gas diffusion layers for proton exchange membrane fuel cell. Especially in fuel cell, water repellency of gas diffusion layer has become very important property for preventing flooding which is induced by condensed water could damage the fuel cell performance. In this work, we fabricated superhydrophobic network of carbon fiber with high aspect ratio hair-like nanostructure by preferential oxygen plasma etching. Superhydrophobic carbon fiber surfaces were achieved by hydrophobic material coating with a siloxane-based hydrocarbon film, which increased the water contact angle from $147^{\circ}$ to $163^{\circ}$ and decreased the contact angle hysteresis from $71^{\circ}$ to below $5^{\circ}$, sufficient to cause droplet roll-off from the surface in millimeter scale water droplet deposition test. Also, we have explored that the condensation behavior (nucleation and growth) of water droplet on the superhydrophobic carbon fiber were significantly retarded due to the high-aspect-ratio nanostructures under super-saturated vapor conditions. It is implied that superhydrophobic carbon fiber can provide a passage for vapor or gas flow in wet environments such as a gas diffusion layer requiring the effective water removal in the operation of proton exchange membrane fuel cell. Moreover, such nanostructuring of carbon-based materials can be extended to carbon fiber, carbon black or carbon films for applications as a cathode in lithium batteries or carbon fiber composites.

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Preparation and Characterization of Shock Energy Absorber Lanyard used Super Fibers (슈퍼 섬유를 이용한 Shock Energy Absorber Lanyard의 제조 및 특성분석)

  • Cho, Jin Won;Kwon, Sang Jun;Choe, Jong Deok;Kim, Sang Tae;Ji, Byung Chul;Yeum, Jeong Hyun
    • Textile Coloration and Finishing
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    • v.26 no.3
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    • pp.173-180
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    • 2014
  • Fall-arrest system have been widely applied to provide a safe stop during fall incidents for occupational activities. This research object to evaluate the energy capacity of fall arrest shock energy absorber lanyard in relation to the used super fiber. In this work, shock energy absorber lanyard was prepared using high tenacity PET, high tenacity PET/P-aramid and high tenacity PET/UHMWPE, respectively. Dynamic load and static load tests based on the Korea fall protection equipment standard(Korea Occupational Safety & Health Agency standard 2013-13) were conducted. Maximum arrest force by dynamic load test of shock energy absorber showed below 6,000N. Also, static strength by static load test of lanyard and rope remains 15,000N and 22,000N for 1 min.

Application of Molecular Descriptor for Prediction and Analysis of the Affinity between Alkyl Substituted Super Hydrophobic Dyes and Polypropylene Fibers (폴리프로필렌 섬유용 알킬치환 초소수성 염료의 친화력 분석과 예측을 위한 Molecular Descriptor의 활용)

  • Jang, Gyeong-Jin;Jeong, Jong-Seok;Kim, Tae-Gyeong
    • Proceedings of the Korean Society of Dyers and Finishers Conference
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    • 2008.10a
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    • pp.77-78
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    • 2008
  • Affinity between alkyl substituted super hydrophobic dyes and polypropylene fiber has been analyzed by using the molecular descriptor as a method to predict chemical and physical characteristics of compounds. Hydrophobicity of synthesized dyes calculated by LogP which is one of molecular descriptors was increased continuously as the length of alkyl substituents increased.

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Case Study of Application of $SuperMAK^{R}$Submersed Hollow fiber Membrane) ($SuperMAK^{R}$(침지형분리막)을 적용한 오ㆍ폐수시설의 개 보수 사례)

  • 박헌휘;최영근;서창희;조재청;김수룡
    • Proceedings of the Membrane Society of Korea Conference
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    • 2004.05b
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    • pp.123-123
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    • 2004
  • 일반적인 활성슬러지 공정은 MLSS 1,500 - 3,000 mg/L 정도인데 MBR 공정은 보통 8,000 mg/L 이상의 농도로 운전할 수 있어, 높은 유기물 제거와 질산화 효율을 증가시킬 수 있다. 따라서 기존의 포기조 용량을 줄일 수 있으며 미생물의 자산화(Auto-Oxidation)가 증가하여 슬러지 발생량(Sludge Production)은 줄어들게 된다.(중략)

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Electrical Properties of Carbon Black Composites for Flexible Fiber Heating Element (유연한 섬유상 발열체용 카본블랙 복합소재의 전기적 특성)

  • Park, Ji-Yong;Lee, Jong-Dae
    • Journal of the Korean Applied Science and Technology
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    • v.32 no.3
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    • pp.405-411
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    • 2015
  • Carbon composites for flexible fiber heating element were examined to improve the electrical conductivity in this study. Carbon composites using carbon black, denka black, super-c, super-p with/without CNF or dispersant such as BCS03 and Sikament-nn were prepared. Carbon composite slurry was coated on plane film and yarns(cotton, polyester) and the performances of prepared heating materials were investigated by checking electrical surface resistance, adhesion strength. The plane heating element using carbon black under natural drying condition($25^{\circ}C$) had better physical properties such as surface resistance(185.3 Ohm/sq) and adhesion strength(above 90%) than those of other carbon composite heating elements. From these results, polyester heating element coated by carbon black showed better electrical line resistance(33.2 kOhm/cm) than cotton heating element. Then, it was found that polyester heating element coated by carbon black with CNF(3 wt%) and BCS03(1 wt%) appeared best properties(0.604 kOhm/cm).

The Physical Properties of Super Bulky Yarn According to Textured Condition (Super Bulky Yarn의 사가공 조건에 따른 물성변화)

  • Park, Myung-Soo
    • Fashion & Textile Research Journal
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    • v.12 no.4
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    • pp.500-507
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    • 2010
  • In this study, physical properties were studied by using latent stretching yarn in order to develop the texturing yarn technique for super bulky yarn, which is better in bulkiness and handle than natural wool and also adds property of synthetic fiber to natural wool. In order to obtain textured conditions by analysing basic properties for manufacturing DTY yarn with super bulky property, DTY 50d/12 after spinning latent yarn spined POY 80d/12 was obtained under the two conditions of (i) false twist(T/M) level 3 in DTY texturing and (ii) draw ratio level 4 in draw texturing. For DTY texturing yarn, Elongation rate increased as the heat treatment time and temperatures increased. In addition, shrinkage became higher as false twist was higher, so that elongation rate became lower. When annealing became longer in time and higher in temperature, initial modulus increased. In addition, as the count of false twist increased, the initial modulus showed higher values. For draw texturing yarn, under the conditions of heat temperature 180 and heating time 30 minutes, shrinkage rate in draw ratio 1.55 and 1.6 draw ratio was 7%, and that in 1.65 and 1.7 draw ratio was 8.5%. High draw ratio samples' tenacity was much influenced by heating time and temperature, but low draw ratio samples' tenacity was influenced not by treated time, but by treated temperature.

A Study on the Design and Development of Automatic Optical Fiber Aligner (자동 광섬유 정렬 장치의 설계 및 제작에 관한 연구)

  • Kim, Byung-Hee;Uhm, Chul;Choi, Young-Suk
    • Journal of Industrial Technology
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    • v.22 no.B
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    • pp.241-249
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    • 2002
  • Optical fiber is indispensable for optical communication systems that transmit large volumes of data at high speed, but super precision technology in sub-micron units is required for optical axis adjustment. We developed the automatic optical fiber by image processing and automatic loading system. we have developed 6-axis micro stage system for I/O optical fiber arrays, the initial automatic aligning system software for a input optical array by the image processing technique, fast I/O-synchronous aligning strategy, the automatic loading/unloading system and the automatic UV bonding mechanism. In order to adjust the alignment it used on PC based motion controller, a $10{\mu}m$ repeat-detailed drawing of automatic loading system is developed by a primary line up for high detailed drawing. Also, at this researches used the image processing system and algorithm instead of the existing a primary hand-line up and fiber input array and waveguide chip formed in line by automatic.

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