• Title, Summary, Keyword: Synthetic fibre

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Study on Mechanical Properties of Polyester Woven Fabric(V)- Surface Properties - (폴리에스테르 직물의 역학특성에 관한 연구(V)-표면 특성 -)

  • 오애경;김승진
    • Textile Science and Engineering
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    • v.31 no.6
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    • pp.425-433
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    • 1994
  • The surface property of fabrics is an important characteristic in New Synthetic Fibre Fabrics. The hand characteristics of New Synthetic Fibre Fabrics have something to do with the fabric surface property, which is influenced by the structural parameters of yarns and fabrics such as, yarn linear density, twist level, fabric density and weave structure. The purpose of this study is to analyze relationship between surface property of polyester fabrics and their structural parameters as a basic research on the hand characteristics of New Synthetic Fibre Fabrics.

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Measurement of Variation of Fibre Diameter Using Weight -biased Samples (III) Estimation of Variance of Synthetic Staple Fibre Diameter (Weight- biased 표본에 의한 섬유직경의 변동측정 (III) -합성섬유의 직경의 분산추정-)

  • Park, Chang-Hyeok;No, Jeong-Ik;U, Je-Rin
    • Textile Science and Engineering
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    • v.27 no.7
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    • pp.82-85
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    • 1990
  • The inferiority of the variance estimates of synthetic staple fibre diameter when compared to those from the wool tops implies that a special calibration of air flow apparatus is required for synthetic staple fibres. The rapidity and accuracy in the determination of the fibre diameter variance estimate are the main features of the methods developed in this study. Additional work is desirable to provide and improved stream of input fibres to the throwing device.

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A Study on the Photodegradation of Synthetic Fibres (합성섬유의 광에 의한 취화에 관한 연구)

  • 박연흠;김노수
    • Textile Science and Engineering
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    • v.9 no.1
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    • pp.1-4
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    • 1972
  • The effect of carbon-arc radiation on the breaking strength of some kinds of synthetic fibres (PVA, PVC, AN-VDC, PVC-VDC, PVC-AN) was studied. The results were as follows; 1. Polyvinylalcohol fibre is the severest of synthetic fibres in the strength loss. 2. The strength loss is proportional to the square root of exposure hour.

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An Investigation of Spinning and Knitting Performance of Domestic Angora rabbit hair (앙골라 토모의 방적 및 편직성에 관한 연구)

  • 장석윤;최영엽
    • Textile Science and Engineering
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    • v.7 no.2
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    • pp.25-38
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    • 1970
  • This investigation aimed at improving the quality of domestic Angora fur fibre, when it is spun together wool and synthetic fibre, by solving the difficulties in processing and it was also aimed at finding the methods of preventing the fault of fibre-slipping off from knitted goods. This investigations was classified into two main parts, one of them was fundamental study and another was spinning and knitting performance. In the former the physical and chemical properties was investigated, in the latter the spinning and knitting performances was investigated taking use of the results of fundamental study. The processing aspects was, in the study of spinning and knitting performance, compared with the quality of trial-products which was made during the investigation and the method of preventing fibre-slipping off was also studied. Summary of results were as follows; 1) Topology of Angora fur fibre \circled1 Generally Angora fur fibre was classified into three appearances, finer fur fibre, hetero type hair and guard hair. \circled2 Angora fur fibre, regardless of its appearances, was composed of ladder type medulla forming a hollow cylinder and covered with cortex. \circled3 A few crimps was founded in Angora fur fibre except finer fur fibre. \circled4 Though the scale on the Angora fur fibre was founded, it was exceedingly by smaller than that of woo. 2) Physical properties \circled1 Because of characteristics in appearances of Angora fur fibre the strength-elongation behaviour was considerably scattered and load-elongation behaviour of finer fur fibre was less than that of wool. \circled2 The static charging rate of Angora fur fibre was similar to that of wool but discharging rate was quicker than that of wool. \circled3 The staple length of domestic Angora fur fibre was considerably scattered. 3) Chemical properties \circled1 The chemical component of Angora fur fibre was similar to that of wool. \circled2 Rate of curl was increased by the treatment of carroting but the load-elongation behaviour became 4) Spinning and knitting performance \circled1 Smaller amount of water was recommanded when oiling the Angora fur fibre than oiling the wool. \circled2 The processing characteristics of Angora fur fibre was similar to that of wool which has fine denier and long staple. \circled3 Knitting officiency could be increased by the use of additional filament yarn. 5) Fibre-slipping off from the knitted goods \circled1 The mechanism of fibre-slipping off was classified into two parts, fibre-slipping off by statics and frictional pulling. \circled2 a) The prevention of fibre-slipping off was capable by increasing of twists, turns Per unit length of yarn and using of long staple. b) The use of core yarn was effected on the decrease of fibre-slipping off.

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A Development on the Eye Splice's Safety Standards of Synthetic Fibre Ropes for Towing Vessel (예인삭용 합성섬유로프의 아이스플라이스 안전기준 개발)

  • Hwang, Jeong-Il;Lee, Hee-Joon;Lee, Kyoung-Hoon;Kim, Kyoung-Woo
    • Journal of Korea Ship Safrty Technology Authority
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    • pp.28-42
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    • 2014
  • 본 연구는 예인선 해양사고로 인한 사망사건 중 예인삭 절단사건이 큰 비중을 차지하고 있어 인명사고 예방이 시급한 가운데 예인 로프의 아이스플라이스에 대한 기준이 현재 국내에 마련되어 있지 않아 본선의 임의대로 제작?사용하는 실정이다. 이에 우리 공단에서 수검 중인 예인선을 대상으로 예인선에서 주로 사용하는 예인삭의 종류와 구조, 재질 등에 대한 국내 사용실태를 조사하고, 조사를 바탕으로 선정된 로프의 인장강도 시험을 통하여 스플라이스 횟수에 따른 유의성 평가를 시행하며, 국내 외 유사 기준 및 표준을 조사 분석하여 최종적으로 국내에서 적용할 수 있는 예인삭 아이스플라이스 기준을 제시하였다.

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Biodegradable Starch-Based Resin Reinforced with Continuous Mineral Fibres-Processing, Characterisation and Mechanical Properties

  • Wittek, Thomas;Tanimoto, Toshio
    • Advanced Composite Materials
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    • v.18 no.2
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    • pp.167-185
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    • 2009
  • Environmental problems caused by extensive use of polymeric materials arise mainly due to lack of landfill space and depletion of finite natural resources of fossil raw materials like petroleum or natural gas. The substitution of synthetic petroleum-based resins with natural biodegradable resins appears to be one appropriate measure to remedy the above-mentioned situation. This study presents the development of a composite that uses environmentally degradable starch-based resin as matrix and natural mineral basalt fibres as reinforcement, and investigates the fibre's and the composite's mechanical properties. The tensile strength of single basalt fibres was verified by means of single fibre tensile tests and statistically investigated by means of a Weibull analysis. Prepreg sheets were manufactured by means of a modified doctor blade system and hot power press. The sheets were used to manufacture specimens with fibre volume contents ranging from 33% to 61%. Specimens were tested for tensile strength, flexural strength and interlaminar shear strength. Composites manufactured during this study exhibited tensile and flexural strength of up to 517 MPa and 157 MPa, respectively.

Fibre composite railway sleeper design by using FE approach and optimization techniques

  • Awad, Ziad K.;Yusaf, Talal
    • Structural Engineering and Mechanics
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    • v.41 no.2
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    • pp.231-242
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    • 2012
  • This research work aims to develop an optimal design using Finite Element (FE) and Genetic Algorithm (GA) methods to replace the traditional concrete and timber material by a Synthetic Polyurethane fibre glass composite material in railway sleepers. The conventional timber railway sleeper technology is associated with several technical problems related to its durability and ability to resist cutting and abrading action of the bearing plate. The use of pre-stress concrete sleeper in railway industry has many disadvantages related to the concrete material behaviour to resist dynamic stress that may lead to a significant mechanical damage with feasible fissures and cracks. Scientific researchers have recently developed a new composite material such as Glass Fibre Reinforced Polyurethane (GFRP) foam to replace the conventional one. The mechanical properties of these materials are reliable enough to help solving structural problems such as durability, light weight, long life span (50-60 years), less water absorption, provide electric insulation, excellent resistance of fatigue and ability to recycle. This paper suggests appropriate sleeper design to reduce the volume of the material. The design optimization shows that the sleeper length is more sensitive to the loading type than the other parameters.

A Study on the Dyeing Properties of Natural Indigo Complex Powder and Synthetic Indigo with Natural Fiber (쪽풀로부터 제조한 고형쪽과 합성인디고의 염색성에 관한 연구)

  • 정영진;이명환;최해욱;이언필
    • Textile Coloration and Finishing
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    • v.12 no.3
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    • pp.174-182
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    • 2000
  • We prepared natural indigo/calcium hydroxide complex powder from tinctoria's leaf, according to the demand of developing new dyeing technique of natural fibre with natural indigo. FT- IR and UV/Visible spectra were operated to find the dyeing properties of synthetic indigo and natural indigo powder. Cotton, flax and silk fabrics were dyed with different pH, dye concentration and dyeing time. The colour yield of indigo dye was quite sensitive to dye bath pH and fabric. In synthetic indigo, the highest K/S value of dyed silk fabric was shown at near pH 9.0, and which of flax and cotton fabric were shown at pH 11.0. In other hand, in the case of natural indigo complex powder, the highest K/S value of dyed silk fabric was shown at near pH 8.0, and which of flax and cotton fabric were shown at pH 9.5∼pH 10. Mercerized cotton fabric dyed with natural indigo powder has a little antimicrobial activity.

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Production Performance and Carcass Characteristics of Malpura and Mutton Synthetic Lambs Fed Low and High Energy Rations in a Semiarid Region of India

  • Singh, N.P.;Sankhyan, S.K.;Prasad, V.S.S.
    • Asian-Australasian Journal of Animal Sciences
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    • v.16 no.5
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    • pp.655-659
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    • 2003
  • Forty eight lambs (24 each of Malpura and Mutton synthetic breeds) were weaned at 90 days of age and divided into two groups. One group of 12 lambs from each of the two breeds was maintained on low energy (52% TDN) and the other group of 12 on high energy (58% TDN) feedlot ration until 6 of the lambs attained 20 kg and the other 6 attained 25 kg live weight in each of the two groups. Daily feed intake and weekly body weights were recorded. Conventional metabolism trials were conducted on the two breeds and the two rations. The growth rate was found to be higher for lambs on high energy ration (p<0.01). The growth rate was also higher for higher target weight groups (p<0.01). The breed did not significantly affect the live weight gains. Mutton synthetic lambs required less number of days to reach 20 kg live weights but took more time to reach 25 kg target weight as compared to Malpura lambs (p<0.01). The lambs of both the breeds reached 25 kg live weight earlier on high energy than those on low energy ration (p<0.01). The dry matter intake, irrespective of breed, was significantly higher (4.57% or 93.4 g per kgW$^{0.75}$) on low energy than that on high energy ration (4.20% or 87.2 g per kg W$^{0.75}$). The digestibility coefficients of all the nutrients excepting crude fibre were significantly higher on high energy diet irrespective of the breed. Lambs on low energy ration, however, digested the crude fibre more than those on the high energy ration (p<0.05). Although there were no significant differences in the intakes of nitrogen, calcium and phosphorus, the balance of nitrogen was higher on high energy ration. The DCP and TDN values were 9.70 and 52.76% for low energy and 9.89 and 57.68 % for high energy ration, respectively. The dressing percentages on live weight basis were 50.2 on low and 51.6 on high energy ration, 50.5 at 20kg and 51.3 at 25 kg slaughter weight and 51.0 in Malpura and 50.8 in Mutton synthetic lambs, respectively. The percent of bones in the carcass was higher on low energy ration in Mutton synthetic lambs at 20 kg slaughter weight than others. It was concluded that the performance of the lambs in respect of mutton production was significantly better on high energy ration fed upto 25 kg slaughter weight with no or little breed differences.

Structural performance evaluation of precast concrete segment using synthetic fibres (프리캐스트 콘크리트 세그먼트의 합성섬유 보강재 적용에 따른 구조적 성능 평가)

  • Lee, Hoseong;Kim, Changyong;Lee, Sean S.;Kim, Seungjun;Lee, Kyeongjin
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.20 no.2
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    • pp.469-483
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    • 2018
  • Steel bars have been widely used as the primary reinforcement for Precast Segmental Concrete Lining for TBM Tunnels. Previously, studies have been carried out to gauge the potential for steel fiber reinforcement to replace the use of steel bar reinforcements in the segmental lining to reduce the amount of the steel bar reinforcement. Steel fiber reinforcements have been investigated and widely applied to SFRC TBM linings to improve the constructability of SFRC TBM linings worldwide. However, the steel fiber reinforcement often caused punctures to the water membranes inside tunnel lining and had long-term durability deterioration issues caused by steel corrosion, as well as cosmetic problems. Therefore, this paper sought to gauge the potential of synthetic fiber reinforcements, which have proven to be very attractive substitutes for steel fiber reinforcements. This study analyzed the performance of both steel and synthetic fiber reinforcements in segmental linings and evaluated the applicability of the fiber reinforcements to the TBM Precast Concrete Segmental Linings of TBM tunnels. As a conclusion, this study demonstrates that the potential use of steel and synthetic fibers in various combination, can substitute the rebar reinforcement in the concrete mix for segmental concrete linings.