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.

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.

Primer 처리에 의한 폴리케톤 섬유/천연고무 복합재료의 계면접착 및 내피로성

원종성,진다영,손한글,홍영기,이승구,Won, Jong Sung,Jin, Da Young,Son, Han Geul,Hong, Young Ki,Lee, Seung Goo 한국섬유공학회 2014 한국섬유공학회지 Vol.51 No.2

Cords have commonly been used as reinforcing materials in rubber composites. To improve cord/rubber interfacial adhesion, the cords are usually coated with an adhesive (typically based on Resorcinol-Formaldehyde-Latex(RFL)). These cord/rubber composites have been used in many sectors such as the tire, hose and belt industries. Interfacial adhesion between cord and rubber is an important determinant of the durability of the composite system. In this study, newly developed polyketone cord was coated by dipping in various RFL-based adhesive primers and then bonded to natural rubber by a compression molding method. The resin/latex ratio in the RFL adhesive primer was varied in order to achieve the optimal mixing ratio. Polyketone cord was treated with primers at various heating temperatures and dipping times. To measure the adhesion strength between the polyketone cord and the natural rubber, and the fatigue resistance of the composite system, the H-test and the tension-compression test were performed. The surface of the polyketone cord treated with primer was examined by attenuated total reflectance (ATR) spectroscopy and other instrumental techniques.

제인 나노섬유 멤브레인을 이용한 6가 크롬 이온 흡착 평가

윤나경,곽효원,이민규,이서경,이기훈,Yun, Na Kyong,Kwak, Hyo Won,Lee, Min Gyu,Lee, Seo Kyung,Lee, Ki Hoon 한국섬유공학회 2014 한국섬유공학회지 Vol.51 No.2

Heavy metal pollution is a serious problem that harms the environment and human health. As a means of removing heavy metal ions, especially Cr(VI), from a solution, we prepared a nanofibrous membrane from zein protein which is derived from maize. The zein nanofibrous membrane (ZNM) was prepared by using an 80% ethanol solution as a solvent. The resulting fiber had a ribbon-like structure. The size of the nanofiber could be controlled by varying the concentration of the zein in the ethanol solution. The ZNM was mounted in a membrane holder and a Cr(VI) feed solution was then continuously passed through the ZNM. The adsorption of Cr(VI) reached equilibrium within 3 min, indicating the rapid adsorption of the Cr(VI). To regenerate the ZNM adsorbent, the adsorbed Cr(VI) was removed by adding 0.1 M NaOH. We believe that ZNM would be an effective means of removing Cr(VI) from industrial waste.

컬러 매칭 알고리즘을 이용하는 디지털 컬러 장비의 특성화

홍민희,조현태,Hong, Min Hui,Cho, Hyeon Tae 한국섬유공학회 2014 한국섬유공학회지 Vol.51 No.1

There is a strong demand for original color reproduction regardless of the imaging device being used. To reduce color distortion and the problem of color communication, it is necessary to determine the color characteristics of each imaging device. For example, color reproduction varies between different kinds of printers because of the differences between the inks and color gamut of each device. It is well known that the ICC profile is used for printer color reproduction. This raises the issue, however, of whether the inks are manufactured using the same ICC profile. In this study, a new digital color device characterization method based on color matching using the R, G, B spectra and C, M, Y, K spectra is proposed. The ICC profile and the multiple regression analysis method are used to compare the results obtained with the characterization method. The differences between the target colors and the colors actually produced by a digital color device, for example, a monitor and a printer, using the proposed characterization method were found to be smaller than when using ICC profiles or the multiple regression analysis method when a comparison is made without considering the color mapping effect. The colors for which there is a large color difference are distributed toward the boundaries of the device's color gamuts.

요드화된 무배향 및 배향 폴리비닐알코을 필름의 요드 제거 후의 구조

신은주,이양현,최석철 한국섬유공학회 2002 한국섬유공학회지 Vol.39 No.6

Undrawn and drawn PVA films prepared by solution casting were iodinated with aqueous solutions of 0.1, 0.3, 0.5, 1.0, 2.0 mol/l of 12/KI and deiodinated by mixture aqueous solution of 7 wt% sodium thiosulfate and 5 wt% ethylene glycol. The fine structure of the films after deiodination was investigated by density, X-ray diffraction analysis, differential scanning calorimetry(DSC), and hire fringence determination. It was confirmed by the analyses of X-ray diffraction and DSC that the crystalline structure was recovered to the original PVA crystalline structure by deiodination. The degree of crystallinity was greater but the mean crystallite size of the film after deiodination was smaller than those of the untreated film. The melting points after iodination and deiodination were lower for the unoriented films and higher for the oriented films compared with those of the untreated film. The hire-fringence and amorphous orientation of the oriented film after deiodination were smaller than those of untreated film.

빈랑자 추출물의 집먼지 진드기에 대한 살충효과

정진순,Jung, Jin Soun 한국섬유공학회 2014 한국섬유공학회지 Vol.51 No.1

In this study, the insecticidal effect of the ethanol extract of Areca catechu against the house dust mite, Dermtophagoides pteronysinus, was examined. Ethanolic Areca catechu extract was directly applied at different concentrations (1.0, 0.5, 0.25, 0.125, 0.0625 mg/$40{\mu}l$) and then allowed an exposure of 24 hours. The 1.0 mg/$40{\mu}l$ and 0.5 mg/$40{\mu}l$ concentrations of Areca catechu ethanol extract produced mortality rates of 100% and 98%, respectively, against house dust mite, Dermtophagoides pteronysinus. Areca catechu ethanol extract at a concentration of 0.125 mg/$40{\mu}l$ produced a 50% insecticidal effect. These results proved the insecticidal effect of Areca catechu ethanol extract against house dust mite, Dermtophagoides pteronysinus. To check for the presence of the recognized insecticidal arecoline and monoterpene compounds in Areca catechu, gas chromatography-mass spectrometry and thermal desorption-gas chromatography/mass spectrometry were performed. As a result, arecoline and ten monoterpene compounds were identified in Areca catechu.

600 nm급 폴리에스터 해도형 초극세사 편성물의 감량 및 염색 특성

김현성,신은숙,이정진,Kim, Hyun Sung,Shin, Eun Suk,Lee, Jung Jin 한국섬유공학회 2014 한국섬유공학회지 Vol.51 No.1

The weight reduction and dyeing properties of circular-knitted fabric manufactured from sea-island-type polyethylene terephthalate (PET) ultramicrofiber were investigated. The diameter of a single fiber was approximately 600 nm. The results of scanning electron microscopy (SEM) analysis, alkali dissolution ratio measurements, and cationic dye staining method revealed that the dissolution of the sea component from each ultramicrofiber was completed through alkali treatment with 1% NaOH aqueous solution for 30-40 min at $95^{\circ}C$. The color yield of the disperse dye on the fabric was observed to be dependent on the dyeing temperature. The color yield increased with an increase in the dyeing temperature up to $120^{\circ}C$, and then decreased at $130^{\circ}C$. The build-up property was generally good. The wash fastness was poor and the light fastness was very poor.

음이온성 공중합 폴리에스터/Dodecylbenzenesulfonate 블렌드 필름의 열적 특성 및 알칼리 감량

지민호,이종환,홍충희,엄대길,김선홍,최진욱,백두현,Jee, Min Ho,Lee, Jong Hwan,Hong, Choong Hee,Eom, Dae Gil,Kim, Sun Hong,Choi, Jin Uk,Baik, Doo Hyun 한국섬유공학회 2014 한국섬유공학회지 Vol.51 No.1

A series of anionic copolyester/dodecylbenzenesulfonate (DBS) blend films were prepared by a melt-compounding method and then annealed under a range of conditions. To eliminate possible experimental errors in measuring the alkaline reduction rate of the samples, the crystallinity should be uniform. We used Fourier transform infrared (FT-IR) spectroscopy to measure and control the relative crystallinity of the annealed samples. The relationship between the crystallinity and reduction rate, as well as the annealing conditions of the annealed blend samples, was derived. FT-IR analysis showed that the crystallization rate of copolyester/DBS blend films is lower than that of pure copolyester. However, the alkaline weight reduction rate of the blend films, which have similar crystallinities, increases dramatically with increasing DBS content, even at a low DBS content of 1 to 3 wt%, although the effect of the DBS becomes negligible above 5 wt%. However, unlike the result for annealed films, the alkaline weight reduction rate for amorphous films exhibited a linear relationship between the alkaline reduction rate and the DBS content for all of the examined DBS content, demonstrating that the effects of the DBS on the alkaline weight reduction of the copolysester could be affected by processing conditions such as post-drawing and annealing.

실험계획법을 이용한 동축 에어블로운 전기방사 공정의 최적화

이현주,최민기,박진희,김주용,Lee, Hyun Joo,Choi, Min Ki,Park, Jin Hee,Kim, Jooyong 한국섬유공학회 2014 한국섬유공학회지 Vol.51 No.1

In this study, a coaxial air-blown spinning system has been optimized for the variables of air flow rate, solution concentration, and voltage using the design of experiment (DOE) method. Both response surface analysis (RSA) and Taguchi's method (TM) were employed and compared to obtain the optimal process conditions. A total of 41 spinning trials were utilized and fitted with RSA and TM; they were then used to obtain mathematical prediction models. The resulting optimum parameters were an air flow rate of 20 l/min, a concentration of 8 wt%, and a voltage of 35 kV, predicting an average diameter of 335.76 nm with an estimated error of 18.85 nm. In TM, the SN ratio was calculated on randomly chosen data. The optimal process conditions that gave the largest SN ratio were an air flow rate of 20 l/min, a concentration of 8 wt%, and a voltage of 30 kV, representing the estimated SN ratio and diameter, -52.03 and 309.11 nm, respectively. For coaxial air-blown electrospinning under the same conditions, the experimental SN ratio and diameter were -52.0269 and 376.75 nm, respectively.