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      • KCI우수등재

        Draft Zone에서 혼방섬유의 운동상태와 불균제에 대한 연구

        장석윤 한국섬유공학회 1967 한국섬유공학회지 Vol.4 No.1

        纖維長이 틀리는 2種의 纖維를 混紡하되 長纖維는 等長纖維를 擇하고 짧은 纖維는 不等長纖維를 擇하여 混紡할 때 Draft Zone의 ratch를 長纖維便에 맞추어 놓고 不等長纖維만 浮遊纖維가 되게하여 이들이 Draft Zone 內에서의 纖維先端密度를 나타내고 Forster의 Sub-roving의 槪念에 立脚해서 Draft Zone 內에서의 Sub-roving의 平均速度를 計算했고 Draft Zone 內에서 纖維가 이러한 값에 따르지 않을 때 Irregularity가 커지는 것으로 究明했다. 또 Draft Zone 內에서의 纖維相互間의 接觸狀態를 推論하고 이들의 接觸狀態는 餘他條件이 變化하지 않는 限纖維相互間의 摩擦에 依해서만 決定지워 진다고 推論하고 Draft Zone에서 纖維相互間의 接觸狀態는 의 關係가 파괴 될 때 Irregularity는 增加하며 이 關係는 纖維相互間의 마찰에 依해서 變化한다는 것을 推論하고 이것들을 實驗的으로 確認했다.

      • KCI우수등재

        권축섬유의 하중-신장 거동

        양철곤,원천화구 한국섬유공학회 1983 한국섬유공학회지 Vol.20 No.6

        본 연구는 권축섬유의 하중-신장거동에 대한 이론적인 검토와 그 결과를 기존의 방법으로는 측정하기 어려웠던 가는 섬유의 강성도를 외팔보법(cantilever method)에 의하여 측정함으로서 실험적으로 확인하여 보았다. 섬유에 주어지는 권축형태가 다양하지만 유형별로 크게 분류할 때 싸인곡선 형태와 나선형태로 분류될 수 있으므로 두 형태로 구분하여 이론적으로 검토하여 보았으며, 실험에서는 폴리에스테르계섬유(2d, 3d) 싸인곡선 형태에, 잡종양모(56's)는 나선형태에 각각 적용시켜 검토하였다. 실험 결과로부터 권축섬유의 하중-신장에 있어 초기영역에서는 이론곡선과 실험 결과가 대체적으로 잘 부합되고 있음을 확인하였으며, 또한 단섬유의 강성도 측정에서 외팔보법을 이용하면 이형단면 섬유의 정확한 굽힘강성 측정을 손쉽게 할 수 있다는 결과로 이해되었다. The theoretical load-extension behaviour of crimped fiber was studied on the basis of experimental results. The crimped forms of samples were assumed sinusoidal for polyester staple fiber and helical for cross-bred wool fiber, respectively. Flexuarl rigidity of fiber which was one the important factors in load-extension behaviour was measure by canilever system apparatus developed by authors. It is shown that by putting the value of flexural rigdity(G) into derived formulas, the load-extension behaviour of a crimped fiber can be predicted precisely in the initial uncrimping region.

      • KCI등재

        PVA/탄소나노튜브 복합수용액의 유변학적 특성과 전기방사특성에 관한 연구

        김성훈,왕샤오,이상철,민병길,Kim, Seoung-Hoon,Wang, Xiao,Lee, Sang-Cheol,Min, Byung-Gil 한국섬유공학회 2006 한국섬유공학회지 Vol.43 No.5

        Aqueous solutions of poly(vinyl alcohol)(PVA) containing single-walled carbon nanotube (SWNT) and multi-walled carbon nanotube (MWNT) were prepared by using surfactants and sonication. It was found that the solution viscosities are significantly dependent on types and amount of surfactant and nanotubes. Sodium dodecylbenzene suifonate (NaDDBS) was most effective in dispersing SWNT in water by showing that highest viscosity of PVA/SWNT aqueous solution. The viscosity of PVA/CNT aqueous solution increased with increasing of sonication time implying the exfoliation of CNT However, the viscosity decreased at the additional sonication due to breaking of nanotubes in length. PVA/SWNT aqueous solution showed much higher viscosity than PVA/MWNT solution due to the increase of specific surface area and entanglement by exfoliation of SWNT rope to the individual nanotube. The PVA/SWNT solution exhibited good spinnability in electrospinning.

      • KCI등재

        폴리우레탄/나일론 66 블렌드 제조시 스크류 속도 변화에 따른 기계적 물성 및 모폴로지에 관한 연구

        전병철,정미화,조태근,정용찬,Chun Byoung-Chul,Chong Mi-Hwa,Cho Tae-Keun,Chung Yong-Chan 한국섬유공학회 2006 한국섬유공학회지 Vol.43 No.3

        Incompatible blend of polyurethane(PU) and nylon 66 was prepared from melt mixing method utilizing twin screw extruder, and screw speed was changed to enhance the compatibility of the blend. Tensile, impact, thermal properties were measured to evaluate the effect of screw speed change on the mechanical properties. Also morphological and structural behavior were analyzed from XRD and SEM. As the screw speed increased, the dispersed phase particle size decreased and the degree of dispersion improved, and resulted in an improved tensile and impact strength. More specifically, tensile strength of 25 wt% PU/75 wt% nylon 66 blend was 38.1 MPa at the screw speed of 100 rpm, and it increased to 50.3 MPa at 400 rpm. Strain at break of 75 wt% PU/25 wt% nylon 66 blend increased from 64.9% at 100 rpm to 141.7% at 400 rpm, thus showed more than 100% increase in strain at break. Impact strength of 50 wt% Pu/ 50 wt% nylon 66 and 25 wt% PU/75 wt% nylon 66 blend also showed a slight increase with the screw speed increase.

      • KCI등재

        폴리프로필렌 멜트블로운 공정 변수가 부직포 여과재의 포집 특성에 미치는 영향

        홍영기,Hong, Young-Ki 한국섬유공학회 2006 한국섬유공학회지 Vol.43 No.5

        Meltblown process is one of the major processes for nonwoven filters. In this study, the collection efficiency of meltblown nonwoven filters made of isotatic- polypropylene(i-PP) was examined for the various processing conditions such as die and air temperatures, die-to-collector distance(DCD) and attenuation air flow rate at the die. The collection efficiency for non-woven filter was found to increase with decreasing DCD, with increasing die temperature, or with increasing air flow rate. In addition, the quality factor of non-woven filter was excellent with increasing DCD in meltblown process like this.

      • KCI우수등재
      • KCI등재

        N-isopropylacrylamide의 그라프트에 의한 아크릴 섬유의 표면개질

        우종형,서영삼,윤기종,Woo, Jong-Hyung,Seo, Young-Sam,Yoon, Kee-Jong 한국섬유공학회 2006 한국섬유공학회지 Vol.43 No.3

        Acrylic fibers were graft-copolymerized with N-isopropylacrylamide in aqueous media, using a radical initiator, benzoyl peroxide. The grafting reactions were carried out within the $75{\sim}85^{\circ}C$ temperature range, and the effects of initiator, monomer concentration, and the amount of fiber on the graft yield were also investigated. The maximum graft yield of 88.6% was reached when grafting was carried out at the benzoyl peroxide concentration of $2{\times}10^{-3}mol/l$, the N-isopropylacrylamide concentration of 0.5 mol/l, for 8 hours at $80^{\circ}C$. The grafted fibers were characterized by nuclear magnetic resonance spectroscopy, infrared spectroscopy, scanning electron microscopy, and thermogravimetry. Scanning electron micrographs showed that homogeneous fiber surface changed to shell-like heterogeneous appearance with increase in degree of grafting. Fiber diameter also increased with graft yield. Moreover, moisture regain and water absorptivity of the grafted fiber were highly enhanced by grafting. The results on the response of grafted acrylic fibers to pH and heat are presented.

      • KCI등재

        전통한지의 형태안정성 및 염색성에 미치는 가교의 영향

        박병기,한태희,정용식,Park Pyong-Ki,Han Tae-Hui,Chung Yong-Sik 한국섬유공학회 2006 한국섬유공학회지 Vol.43 No.2

        The Hanji treated with citric acid as crosslinking agent was prepared to improve wet dimensional stability and wet-strength. To improve dyeability for direct and reactive dyes, various concentrations of chitosan were added in crosslinking process. The wet dimensional stability and wet-strength of crosslinked Hanji were improved by citric acid addition, whereas the folding endurance significantly decreased. As the concentration of citric acid increased, K/S values of the crosslinked Hanji for berberin increased, but those direct and reactive dyes decreased. However, the dye adsorption for direct dye and reactive dye were improved by chitosan addition.

      • KCI등재

        위사밀도 동역학 확장 모델과 시뮬레이션

        허유,전두환,김종성,Huh You,Chun Du-Hwan,Kim Jong-S. 한국섬유공학회 2006 한국섬유공학회지 Vol.43 No.2

        Modern weaving machines have the beat-up mechanism whose front position is predetermined mechanically. Therefore the relative position between the reed front and the clothfell plays an important role in producing the high quality fabrics with uniform weft density distribution. This research reports on the results from the simulation that was conducted on the basis of the theoretical model about the fabric weft density dynamics, including the factors such as beat-up motion and warp tension. Results showed that the weft density change was very sensitive to the initial clothfell position. The clothfell position was relocated toward the machine front during the machine restart and then it approached the steady state value. A low initial warp tension led to a narrow pickspace, too. Even though the warp tension and the beat-up force changed for a long period of time after the machine restarted, the weft interval variation and the clothfell position change were stabilized early, while the clothfell position showed an overshooting behavior for a low initial warp tension under a high level of process tension condition. Initial weft interval condition showed no influence on the dynamic behavior of the weft density.

      • KCI등재

        착색 방법 변화가 편광필름의 광학특성에 미치는 영향

        장진호,구광회,백상현,박상봉,박일현,최이준,Jang Jin-Ho,Koo Gwang-Hoe,Back Sang-Hyun,Park Sang-Bong,Park Il-Hyun,Choi E-Joon 한국섬유공학회 2006 한국섬유공학회지 Vol.43 No.3

        Four kinds of polarizing film were prepared by two coloration methods of dipping and dyeing using either iodine or dye as a dichroic colorant. The optical properties of the polarizing films were compared at various concentrations of dichroic colorants and draw ratios. While iodine of low substantivity to PVA film showed little dependence of colorant content on the coloration methods, in the dye-type polarizing film dyeing method caused higher surface and bulk colorant contents than dipping method due to higher substantivity of the dichroic direct dye. However surface dichroic colorants on the film exhibited higher effectiveness in terms of observed optical properties compared with bulk dichroic colorants in the PVA film. While dye-type polarizing film showed excellent resistance to heat and humidity compared to iodine-type, coloration method did not influence significantly the optical durability of dye-type polarizing film under hot and humid condition.

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