Variation of Longitudinal Modulus with Twist for Yarns Composed of High Modulus Fibers

Variations of longitudinal and transverse moduli with twist for twisted yarns and twisted yarn-resin composite strands composed of fibers covering a wide range of tensile moduli are investigated using a sonic pulse propagation method. For twisted yarns composed of fibers relatively low in tensile modulus, the longitudinal modulus decrease..

Home | News & Info | KOTITI 라이브러리 | 섬유기술정보 I 등록일 : 2012.08.20 I 조회수 : 82

A Generalized Micromechanics of Continuous-Filament Yarns. Part I: Underlying Formalism

A constitutive theory is proposed to predict the stress-strain behavior of a twisted filament yarn under extensive elongation from the structural parameters and constituent moduli. This theory can predict the radial distributions of local stress and strain as well as the load- elongation relation, if the initial distributions of the local..

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Stitch Length Variation in Circular Knitting Machines Due to Yarn Winding Tension Variation in the Storage Yarn Feed Wheel

The yarn delivery rate required to knit a given stitch quality on a multifeeder circular knitting machine is generally based on the belt speed of the positive yarn feed system. The actual stitch length in the fabric measured after knitting is always less than the stitch length required. Yam tension immediately before the yarn is wound on ..

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The Wicking Kinetics of Liquid Droplets into Yarns

The wicking kinetics of liquid droplets into yarns is studied using a computerized imaging system. A new method is suggested for characterizing the yarn structure by monitoring droplet absorption. The method is based on the comparative analysis of the time needed for droplet disappearance as a function of droplet volume for various yarns...

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Theoretical Analysis of Load-Extension Properties of Plain Weft Knits Made from High Performance Yarns for Composite Reinforcement

This paper presents a theoretical analysis of the tensile properties of plain weft-knitted fabric. Load-extension curves in the coursewise and walewise directions for fabrics made from glass fibers are theoretically calculated and compared with experimental results, and good agreement is obtained between them.

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Effect of Physical Processing on the Wool Fiber Surface

Wool fibers are subjected to severe mechanical processing following scouring, which results in physical damage. This study investigates the role of physical processing in changing the physical and chemical properties of the fibers. Removal of surface-bound lipids following physical processing is minimal, but there are significant morpholo..

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Dynamic Analysis of Yarn Unwinding from Cylindrical Packages. Part II: The Three-Region Analysis

In Part II of this series [2], we analyze the three-region problem. The formulation constitutes an integrated analysis of the three regions, which permits a study of the yarn path and related tension distributions for unwind points away from the two ends of the package. The numerical solutions presented reveal a very complex interaction b..

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A Constitutive Model for Blended Yarn Extension with Fragmented Low-Elongation Fibers

A simple micromechanical model is developed for the interactions in a parallel square- stacked mixed array of elastic fibers representing the microstructure of a blended yarn undergoing axial extension. The mixed array consists of a small fraction of relatively high modulus, low elongation-to-break (LE) fibers dispersed among high elongat..

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2012년 시험인증산업 국제심포지엄 안내

<2012년 시험인증산업 국제심포지엄 안내> □ 행사개요  ㅇ 개최배경 : 국내․외 전문가를 초빙하여 시험인증산업을 고부가 서비스산업으로 육성하기 위한 방안을 논의  ㅇ 일시/장소 : ‘12. 9. 6(목) 09:30~17:00 / 서울 플라자호텔 그랜드볼룸  ㅇ 주최 : 기술표준원, 머니투데이, 한국시험인증산업협회 공동주최  ㅇ 참석자 : 국내외 초청인사, 정부부처 관계자,..

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공석붕의 섬유소재 해설 - 아마(Linen) (2)

아마는 4월경에 씨를 뿌리고 7-8월이면 수확을 한다. 아마는 매년 같은 토지에서 연작을 하면 수확량 이 줄고 품질도 떨어지기 때문에 6~7년마다 윤작(輪作)을 한다. 아마의 줄기는 직경 8~20 mm 정도의 굵기로서 80~120 cm정도의 크기로 자라고, 가지 끝에는 흰색 이나 자색의 꽃을 피우는데, 때로는 청색이나 장미색의 꽃이 피기도 한다. 그리고 길이 4~6 mm, 폭 2..

Home | News & Info | KOTITI 라이브러리 | 섬유기술정보 I 등록일 : 2012.08.16 I 조회수 : 121