컴팩(compact)방적사의 제조메카니즘과 그 특성화 = Manufacture mechanism and characterization of compact spun yarns

다국어 초록 (Multilingual Abstract)

Most of the technical advances in ring spinners are aimed to improve the performance and productivity of existing technology. The ring spinner is still widely applied to short and long staple yarn formations. Due to the productivity limitation of ring spinners, the innovative spinning systems, such as open-end rotor, friction, air-jet, solo, and air-vortex spinners, have developed commercially. In recent, the compact spinner is also introduced and it's technique is to minimize the size of the spinning triangle at the draft system of ring spinning technology. In particular, the large spinning triangle of ring spinners has increased the hairiness, *A thesis submitted to the Committee of Graduate School, Chungnam National University in partial fulfillment of the requirements for the degree of Doctor of Textile Engineering in February, 2008. defective and evenness of ring spun yarns, because the fibers forming the surface of the yarn are more highly tensioned than that in the core part of the yarn. Thus, the compact spinner emphasizes on improving yarn quality rather than increasing productivity.
In recent, various compact spinning methods are also developed and are made a commercialization. Since the various compact systems have different spinning mechanism and yarn characteristics, it is necessary to study the yarn formation mechanism, yarn structure and yarn properties of these various compact spinners.
The overall objective of this present work is to make comparative study for morphological structure and physical properties of the compact yarn produced by different spinners. We have studied under three stages of experiments for the following specific goals;
1. To compare the yarn formation of compact spinning systems and the structural differences among the yarns, produced by various spinners such as OE rotor, air-vortex and ring systems.
2. To investigate the structure and characteristics of compact spun yarns compared to various compact systems such as system(A), system(B) and system(C), and ring system with the same production conditions.
3. To investigate the various air-suction system of compact spinner technology and structural differences among the yarns, produced by different suction pressure and hole size of compact systems, and compared to ring spun yarns.
From the result of three stages experiments, we can obtain the following summary and conclusions;
1. Regardless spinning systems, the characteristic such as evenness, defective and hairiness of combed yarns, as well tensile strength are better and higher than those of carded yarns, because the structure of combed yarn shows more uniform and even fiber twist architect than the cared yarns.
2. Compared to other spinning systems, the compact system can produce the spun yarn having the most clear structure and best fiber arrangement. Thus, the compact spun yarns is composed of a perfect spiral structure without protruding fibers on the yarn surface.
3. The characteristics of compact spun yarns such as irregularity, yarn faults, hairiness, and tensile strength have best performance among ring, rotor and air-vortex spinning systems.
4. A comparison of three various compact systems shows different characteristics: system(A) and system(B) represent higher tensile strength of the yarn and clearer structure and lower hairiness of yarns, respectively. Meanwhile, system(C) has lowest yarn fault and evenness levels owing to minimizing spinning triangle area.
5. The hairiness, evenness and defective of the compact yarn produced by the compact system(C) have a decreasing trend with increasing the air pressure of suction apparatus.
6. From the consideration of yarn structure, yarn characteristics and electric power cost, the optimum condition for hole size and air pressure of suction apparatus for the compact spinning system(C) is determined the level of 2.0mm and 250mmH2O, respectively.

목차 (Table of Contents)

• Ⅰ. 서론 1
• Ⅱ. 문헌적 고찰 4
• 1. 정방공정의 특징 4
• 1.1 링(ring) 시스템 5
• 1.2 로우터(rotor) 시스템 7
• 1.3 에어젯(air-jet) 시스템 9
• 1.4 에어보텍스(air-vortex) 시스템 11
• 2. 링정방의 꼬임메카니즘 13
• 2.1 꼬임이동 메카니즘 13
• 2.2 꼬임장애 메카니즘 15
• 3. 정방시스템의 방적기하학 25
• 3.1 링정방의 기하학적 구조 26
• 3.2 컴팩정방의 기하학적 구조 33
• 3.3 컴팩정방 응용기술 37
• Ⅲ. 정방시스템에 따른 사구조와 물성 52
• 1. 서론 52
• 2. 시료제조와 실험방법 55
• 2.1 사용원료 55
• 2.2 시료제조 55
• 2.3 실험방법 58
• 3. 결과 및 고찰 59
• 3.1 방적사의 표면구조 59
• 3.2 불균제도 특성 63
• 3.3 결점특성 67
• 3.4 잔털특성 73
• 3.5 인장특성 77
• 4. 중간결론 82
• Ⅳ. 컴팩시스템에 따른 방적사의 특성분석 83
• 1. 서론 83
• 2. 컴팩시스템별 특징 85
• 3. 시료제조와 실험방법 94
• 3.1 사용원료 94
• 3.2 시료제조 94
• 3.3 실험방법 96
• 4. 결과 및 고찰 97
• 4.1 컴팩사의 표면구조 97
• 4.2 불균제도 특성 102
• 4.3 결점특성 106
• 4.4 잔털특성 110
• 4.5 인장특성 115
• 5. 중간결론 119
• Ⅴ. 컴팩방적사의 특성에 흡입장치의 영향 120
• 1. 서론 120
• 2. 시료제조와 실험방법 121
• 2.1 사용원료 121
• 2.2 시료제조 121
• 2.3 실험방법 125
• 3. 결과 및 고찰 126
• 3.1 흡입구 크기와 흡입압력의 영향 126
• 3.2 컴팩사의 표면구조 130
• 3.3 실잔털 특성 130
• 3.4 흡입압력과 실잔털 관계 138
• 3.5 불균제도와 실결점 특성 144
• 4. 중간결론 149
• Ⅵ. 결론 150
• References 152
• Appendices 156