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.

중저가형 Double Flexible Rapier 직기 개발

김영규,최연선,이대훈 한국섬유공학회 1998 한국섬유공학회지 Vol.35 No.5

A low cost double flexible rapier loom has been developed using the crank beating and the take-up mechanisms of the shuttle loom. To get required gripper head motion, rapier driving mechanism is designed through kinematic simulation of the crank beating and the rapier driving mechanisms. To calculate the reaction forces acting at the basic mechanisms, dynamic simulation is performed using NISA DYMES. By finite element modeling for the whole parts of the basic mechanisms, important physical properties used in the simulation are obtained. Noise and vibration are measured for the basic structure to investigate causes of the variation of gripper head motion and vibration. Important factors affecting the performance of the loom are revealed in the whole process of design, manufacturing, and assembly. Considering the reaction forces obtained from the theoretical approach and experimental results, the rapier driving mechanism is revised to reduce the reaction forces. Part designs of the rapier driving mechanism are changed to reduce weight and increase stability, the manufacturing method of the pinion and the claw gears is improved, and joint assembly tolerance is maintained. To verify the improved performance of the developed basic structure, noise and vibration measurements are performed. Desired gripper head motion has been obtained, and noise and vibration have been reduced remarkably.

천연 단백질 고분자를 이용한 모직물의 형태안정가공에 관한 연구(ㅣ) -모직물에 의한 케라틴 가수분해물의 흡착거동-

황문섭,박연흠 한국섬유공학회 1998 한국섬유공학회지 Vol.35 No.5

Adsorption behavior of hydrolyzed wool keratins onto wool fabric was first studied systematically for the purpose of improving the permanent set of a wool fabric. The adsorption isotherm of the keratin onto wool fabric showed a Langmuir type and was found to be influenced by pretreatments such as swelling and reduction of wool fabric. Indeed, by the reduction, the diffusion coefficient of the hydrolyzed keratin was increased by about 10 times as large as that of the untreated wool fabric. It was indicated from the solubility test and washing test that new crosslinks were possibly formed by the adsorption of keratin and the subsequent oxidation. Dyeing behavior of the keratin adsorbed wool fabric was also discussed in terms of the adsorbed amount of hydrolyzed keratin.

폴리에틸렌 섬유의 고속방사에 따른 구조와 물성(II) -선상저밀도 폴리에틸렌의 MFR의 영향-

조현혹,김경효,Cho, Hyun-Hok,Kim, Kyoung-Hou 한국섬유공학회 1998 한국섬유공학회지 Vol.35 No.5

Fibers of linear low density polyethylene(LLDPE) having melt flow rate 45 and 50 (g/10 min), which were polymerized by metallocene catalyst and Ziegler-Natta catalyst, respectively, were produced by high speed melt spinning method in the range of take-up velocity from 1 to 6 km/min. The change of fiber structure and physical properties with increasing take-up velocity was investigated through the birefringence, wide-angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), Rheovibron, and Fafegraph-M. The birefringence increased linearly with increasing take-up velocity, and that of LLDPE(45) was higher than LLDPE(50). With increasing take-up velocity, the crystal orientation of LLDPE transformed a-axis orientation into caxis orientation. In dynamic viscoelastic behavior of LLDPE(45) fibers by the high speed spinning, the intensity of crystalline relaxation peak was decreased and crystalline relaxation temperature shifted to lower. But that of LLDPE(50) cannot be observed. Tensile strength and initial modulus were increased and elongation was decreased with increasing take-up velocity. LLDPE(45) fibers was preferred to LLDPE(50) in mechanical properties because of increment of crystal and amorphous orientation factor. The change of birefringence with take-up velocity was closely related to both initial modulus and tenacity uniformly.

광섬유 응용 변위측정장치의 개선에 관한 연구

전두환 한국섬유공학회 1998 한국섬유공학회지 Vol.35 No.4

A review of fiber optic displacement transducer using optical fiber bundle is given as developed by author and co-workers. The transducer consists of an optic lever formed with illuminating fiber and receiving fibers, and an operational amplifier, which can measure up to $10^{-9}$ m range. Recent improvements to the probe are described in this study, which show greater linearity, sensitivity, and flexibility when compared to the original fiber optic lever displacement transducer. The improved transducer performance is examined by using small accelerometer and a typical measurement is performed on a 2-for-1 twister spindle for comparison of vibration response.

투습방수 성능 제어가 가능한 Vistamaxx/Polypropylene Side-by-Side 복합방사 멜트블론 부직포 특성

양병진,임기섭,Yang, Byung-Jin,Lim, Ki-Sub 한국섬유공학회 2016 한국섬유공학회지 Vol.53 No.2

Bicomponent nonwoven fabric was developed by using a melt-blown process to replace a Gore-Tex membrane with water repellency and vapor permeability in outdoor clothing. In this research, bicomponent meltblown spinning by using a S/S (side-by-side) type nozzle was used for nonwoven with a small fiber diameter, water repellency, and water vapor permeability. Vistamaxx with good adhesion was mixed with VMPP (Peroxide/PP match batch chip, Manntek Co.) as a viscosity control material to increase the melt flow index (MFI) for a small diameter of the fiber. In addition, polypropylene (PP) was used by stabilizing the viscosity of the nonwoven. In the results, the average diameter of the fiber was approximately $2.15-2.52{\mu}m$. The diameter of the fiber was decreased by increasing the melt-spinning temperature and air flow pressure. We confirmed that the water repellency was improved by increasing the fiber density in a small-diameter process.

에어젯트 직기의 에어젯트 노즐에서의 공기 유동해석 및 설계에 관한 연구(III) - 동축이중원관 분류에 있어서의 자연흡인 -

김태훈,전병익 한국섬유공학회 1998 한국섬유공학회지 Vol.35 No.4

The double coaxial pipe jet which consists of a central round air jet (an inner jet) and an annular air jet (an outer jet) has been experimentally investigated. To obtain basic data for an optimum design of the main nozzle for an air-jet loom, we have made measurements of static pressures on the walls of the main nozzle and analyzed flow velocity changes in the nozzle tube by changing air tank pressures and acceleration tube.

직물의 물리적 특성에 따른 쾌적성 연구(III) - 열전달특성을 중심으로 -

김태훈,전병익 한국섬유공학회 1998 한국섬유공학회지 Vol.35 No.4

This study was performed to determine the effects of structural characteristics of selected wool fabrics on thermal transport properties. 52 wool fabrics, including 18 plain woven fabrics and 34 twill and satin woven fabrics were used as samples. They were woven with various weft densities for this study. The followings were obtained from the results: The main factors affecting keeping warmth ratio were thickness and bulk density. The keeping warmth ratio of samples increased with increasing thickness and decreasing bulk density of samples. And keeping warmth ratios of samples with finer yarns were higher than those of samples with coarse yarns, specially for plain and twill woven samples. The increase of keeping warmth ratio was great in case of plain woven fabrics, while there was no increase of keeping warmth ratio in case of twill and satin woven fabrics. The results showed that the increase of keeping warmth ratio with thickness increase was least in case of satin woven fabrics.

인공신경망을 이용한 직물구김의 평가(I) - CCD 카메라를 이용한 구김 측정 -

김의화,이대훈 한국섬유공학회 1998 한국섬유공학회지 Vol.35 No.4

A measurement system using a CCD camera was developed for the objective evaluation of fabric wrinkle recovery. The shape of a fabric wrinkle was characterized by black and white color information or power spectra through the Fast Fourier Transformation. Artificial neural networks with the input patterns designed by two types were used to evaluate the fabric wrinkle objectively. These neural networks were constructed on the basis of Generalized Delta Rule. On the other hand, five human experts determined the subjective rank of fabric wrinkle recovery by AATCC TM/128. Wrinkle recovery rank evaluated by neural networks had a little relation to rank generated by human exports. The effects of fabric color on the rank were also investigated.