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김종성,양희원,임정호,허유,Kim, Jong-Seong,Yang, Hee-Won,Lim, Jung-Ho,Huh, You 한국섬유공학회 2009 한국섬유공학회지 Vol.46 No.4
This study deals with developing a measuring system which can provide with information on the weaving performance of warp yarns, which works on the basis of a physical simulator. To reach the initially purposed intention, we measured the warp yarn tension. The measured signal was processed to produce the dynamic average tension, maximum and minimum tension values, and the tension change slope with respect to test cycles, etc.. Results revealed that information on the weaving performance factors such as hair occurrence, entanglement of warp yarns, yarn breakages, and the warp yarn tension relaxation as well could be extracted from the measured tension behavior of the warp yarns, which let the evaluation of the weaving performance of new warp yarns be conducted without direct loading of the yarns on the weaving machine so that the time and material required for weaving fabrics with new warp yarns can be drastically reduced.
Ying Ma,Yueyan Liu,Congying Deng,Xiang Chen,Yang Zhao,Sheng Lu,Youqi Wang 한국섬유공학회 2020 Fibers and polymers Vol.21 No.10
3-D woven textile is generated through the weaving process. Yarn is a non-continuum material domain, thestructure of which is determined by inter fiber movement. In this study, the micro-geometry of 3-D orthogonal weave isgenerated at filament level predicting through the weaving process implementing the digital element approach (DEA). First,the basic concepts and explicit algorithm of DEA is introduced. The method of calculating adjusted digital fiber materialproperty in terms of discretization resolution is proposed. Second, the unit-cell topology of 3-D orthogonal weave is definedby a position matrix. The calculation of potential energy of the cell is derived. At last, a dynamic weaving process is designedto investigate the effect of yarn tension on fabric micro-geometry and cell energy. 4 unit-cells are generated under 4 sets oftension combination. Results show that as the fabric thickness decrease, the filaments of the weft yarns move towards thecenter. The weft yarns at the top and bottom deform into their final shape first. The applied tension on weaver plays adominant role in determining fabric thickness and convergence speed. By comparing the numerical results with themicroscope pictures taken from the actual specimen, it is concluded that the fabric micro-geometry produced by tensioncombination 4 closely matches the experimental results.
송민규,이석영,진영대 한국의류산업학회 2003 한국의류산업학회지 Vol.5 No.2
The bar temple that the warp tension could be controlled evenly on the weaving mc was developed to reduce the color differences between right and left side and center area of the fabrics and to be able to more stable for the fabric properties. In addition, it was easy to operate and to change from bar to ring temple. The fabric samples were woven with bar and ring temple installed on the weaving mc and the function of bar temple developed and fabric properties were analysed for the study. The results of the study were as follows : Time to change from bar to ring temple with bar temple developed was reduced over 97% comparing with the typical bar temple. The warp tension between both side and center area on the weaving mc with bar temple was similar, while the warp tension between them with ring temple was of big differences that the warp tension of center area was higher than the both side area. In the analysis of fabrics woven with bar and ring temple, the warp tenacity and the color difference value(a^* and △h^*) between both side and center area of the fabric samples with bar temple was even, but those with ring temple was not even.
Improvement on Fatigue Performance of 3-D Orthogonal Woven Composite with Nanoclay Modification
Xiaoping Gao,Cong Wang,Wei Wu,Yonggui Li 한국섬유공학회 2021 Fibers and polymers Vol.22 No.1
3-D orthogonal woven composite (3DOWC) has attracted great interest in the industrial and energy fields, due totheir excellent mechanical properties. However, due to the poor bonding strength between fiber and epoxy, it’s mechanicalproperties, especially the fatigue behavior are critical for structural design in the practical applications. The nanoclaymodification composite reinforced with 3-D orthogonal woven fabric (3DOWF)/epoxy resin was fabricated using resininfusion under flexible tooling (RIFT). The quasi-static tensile and fatigue behavior of 3-D orthogonal woven composite(3DOWC) in 0 ° and 90 ° inclined to warp direction were evaluated and compared to the pristine one or composite materialnot modified with nanoclay. The fatigue behavior such as the S-N curves, stress-strain curves, stiffness degradation curvesand residual strength were also obtained. The results show that the tensile strength, modulus and the fatigue life wereimproved effectively due to nanoclay modification. However, the stiffness degradation of nanoclay addition in 90 ° directionwas decreased.
Prevention of Warp Breaks in Jacquard Weaving
Seyam Abdelfattah M.,Lee, Jin-Ho,Hodge George,Oxenham William,Grant Edward The Korean Fiber Society 2007 Fibers and polymers Vol.8 No.1
We developed a system to monitor and locate warp breaks in Jacquard weaving using MEMS accelerometers that are mounted on harness cords. Brief description of the system is provided and system use to prevent warp breaks through the analyses of MEMS signals is demonstrated.
김승진,정기진 한국의류산업학회 2005 한국의류산업학회지 Vol.7 No.1
This research surveys the mechanical properties of worsted fabrics for garment according to the loom characteristics and fabric positions with relation to the warp and weft weaving tensions on the projectile and air jet looms, which is previously surveyed in the 1st paper. For this purpose, the grey fabrics are processed in dyeing and finishing processes. The mechanical properties of the finished fabrics are measured and discussed with relation to the warp and weft weaving tensions of projectile and air-jet looms and the variations of the fabric mechanical properties according to the fabric positions are also surveyed for investigating the homogeneity of the tailorahility and fabric hand.
제직 준비 공정 중 장력 제어를 위한 최신 제어 기법의 적용
백준수(J. S. Baek),안우현(W. H. Ahn),김민재(M. J. Kim),주백석(B. Chu) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
최근 산업용 섬유는 기술적 혁신으로 인해 금속, 플라스틱 등을 대체하면서 전 세계적으로 사용되고 있으며, 이로 인해 세계 산업용 섬유 시장은 빠른 속도로 성장하고 있다. 이러한 산업용 섬유 제직을 위한 준비하는 제직 준비 공정은 실의 장력을 일정하게 유지하면서 와인더에 감아주는 공정으로써, 실의 장력이 일정하지 못하면 섬유의 품질이 낮아지는 일이 발생한다. 이처럼 장력을 제어하는 기술은 섬유 산업에서 중요한 기술이라고 할 수 있다. 제직 준비 공정은 실이 풀리는 언와인더, 실을 이송하는 MSD (Master Speed Driver), 실이 감기는 와인더 등의 롤투롤 시스템으로 구성할 수 있다. 이때, MSD 에서는 실의 이송 속도를 제어하고 와인더와 언와인더에서는 실의 장력을 제어하게 된다. 공정이 진행됨에 따라 와인더 및 언와인더의 직경과 관성모멘트가 변화하기 때문에, 롤투롤 시스템은 시간에 따라 모델의 특성이 변화하는 시변 시스템(Time-varient System)이라 할 수 있다. 이러한 시스템에 PID(Proportional-integral-differential) 제어기를 사용할 경우, 안정적으로 실의 장력을 유지하는데 한계가 존재한다. 따라서 제직 준비 공정 중에 실의 장력을 일정하게 유지하기 위해서는 시변 시스템을 다룰 수 있는 제어 기법들을 적용할 필요성이 있다. 롤투롤 시스템에 H-infinity 제어, 적응형 PID 제어, 인공신경망 등 여러 제어 기법을 이용하여 장력을 제어하기 위한 연구가 진행되어 왔으며, 와인더와 언와인더의 직경 변화 및 이송 속도 변화에도 일정한 장력을 유지하는 결과를 얻을 수 있다. 따라서 제직 준비 공정에 위와 같은 최신 제어 기법을 적용하였을 때, 섬유 품질이 더 나아질 것이라 예상한다.