• Title/Summary/Keyword: Korean yam

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Effect of Processing Condition of Texturing M/C on the Physical Properties of Textured Polyester Filament (폴리에스테르 필라멘트의 텍스쳐링 공정조건이 사물성에 미치는 영향)

  • 김승진;안병훈;이민수
    • Textile Coloration and Finishing
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    • v.11 no.6
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    • pp.18-23
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    • 1999
  • PET POY(pre-oriented-yam) were treated by false twister to high bulky. False twister have many processing parameters velocity ratio(VR), belt cross angle$(\theta)$, 1st heater temp. and K(twisting tension/untwisting tension). we analyzed the effect of properties of textured polyester yam on processing condition. Initial modulus, thermal stress, No. of snarl is decreased by 1st heater. In VR=1.97, Dry and wet shrinkage is increased but is decreased by 1st heater in VR=1.564. K/S and cristallinity tend to increase by decreasing VR.

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Dyeing Properties of Nylon Textured Yarn according to False Twist Texturing Parameters(I) - Effect of Draw Ratio - (가연조건에 따른 나일론 섬유의 염색특성 (I) - 연신비의 영향 -)

  • Hu, Jong-Tea
    • Textile Coloration and Finishing
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    • v.20 no.2
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    • pp.47-52
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    • 2008
  • Nylon textured yarn is usually manufactured by disk type false twist texturing. Dyeing properties of nylon textured yam have not been studied yet. In this study, dyeing properties of nylon textured yam according to draw ratio out of process parameters were investigated. The fact that microstructure of nylon textured yarn in amorphous region particularly is transformed by draw ratio was confirmed indirectly by measurement of dyeing rate because dyeing rate was affected by the structure of amorphous region. Dyeing rate at draw ratio 1.29 was the lowest because the higher draw ratio increase amorphous orientation and disturb dye diffusion into amorphous region. The microstructure according draw ratio was indirectly confirmed by 5% strength, tenacity, elongation. But difference in K/S value and fastness was insignificant.

Evaluation of Image Quality of Inkjet Printing on the Spun Polyester Fabrics

  • Park, Heung-Sup
    • Textile Coloration and Finishing
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    • v.18 no.5 s.90
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    • pp.61-71
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    • 2006
  • This paper addresses the factors hindering the image quality of lines in inkjet printed on polyester fabric as printing media. Lines were printed onto different types of polyester fabrics in warp and filling directions. Line image quality including line width, edge blurriness, and edge raggedness was assessed. The effect of capillary wicking on line image quality of printed spun polyester fabric is discussed. The factors on the image quality include printing position(top of the yam or between the yarn), printing direction(warp or filling), yarn structures(filament or spun), thread size(yam or fiber), finishing, and ink properties(evaporation rate). More than 30% differences in image quality results were observed by changing the printing location on the spun polyester fabric. The best results of the image quality were obtained with the printed plain and spun polyester fabrics. The fiber sizes may affect capillary size; therefore, the image quality can be dissimilar. Types of finishing materials and inks greatly improve the line image quality on spun polyester fabrics.

A Study on the Physical Properties of ATY Produced with Nylon FDY and ROY (Nylon FDY와 ROY로 제조한 ATY의 물성에 관한 연구)

  • Kim Seung Jin;Kim Jae Woo;Hong Sang Gi
    • Textile Coloration and Finishing
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    • v.16 no.6
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    • pp.35-43
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    • 2004
  • This study surveys the physical properties of ATY produced with FDY and POY. ATY is made with 70d Nylon FDY and 80d Nylon POY using AIKI air jet texturing machines, respectively. The processing parameters such as air pressure and yam speed are varied, and air pressure is varied ranging with 8.5bar, l0.5bar and 1l.5bar, and yarn speed is varied ranging with 400m/mim, 450m/mim, and 500m/min. The various physical properties of ATY made by POY and FDY denier, wet shrinkage, dry shrinkage, tensile properties, thermal stress and instability are measured and discussed with air pressure and yam speed. The shrinkage simulation of ATY is performed for analysing the process shrinkage on the dyeing and finishing processes.

Analysis of the Dimensionless Torque in Cone Drum False Twisting Mechanism

  • Lee, Choon-Gil;Kang, Tae-Jin
    • Fibers and Polymers
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    • v.4 no.4
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    • pp.161-168
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    • 2003
  • An investigation of the dimensionless torque in the newly developed cone drum twister texturing mechanism is reported. The cone drum twister is one of the outer surface contacting friction-twisting devices in false-twist texturing. In this cone drum twister, a filament yam passes over the surface of the cone drum that rotates by the passing yarn without a special driving device. This research is composed of the theoretical analysis of the false twisting mechanism and the experimental analysis at room temperature. The equations have been derived which shows interrelationship of the conical angle of cone drum, the wrapping angle, the drag angle, and the yam helix angle. Theoretical values of dimensionless torque were calculated and were compared with the experimental results. It is shown that, as the conical angle and the projected wrapping angle increased, the dimensionless torque also increased. But the conical angle was reached to ${30.75}^{\circ}C$, the dimensionless torque decreased.

A Focus on Textile and Apparel chapter in the KORUS FTA Rules of Origin (한.미 자유무역협정 섬유 및 의류산업 원산지 규정에 대한 고찰)

  • Park, Do-Joon
    • International Commerce and Information Review
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    • v.10 no.3
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    • pp.197-219
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    • 2008
  • The aim of this paper is to review KORUS FTA Rules of Origin. Although there are some differences in terms of structure and contents, KORUS FTA Rules of Origin is not much different from the other FTA's texts that Korea has already concluded. Textile and Apparel chapter is also separately specified. For textile and apparel goods, Korea and the US agreed to adopt 'yam-forward rule', allowing exceptions for certain goods. Both sides also agreed to introduce procedures for permitting to use non-Party's materials when fibers ryarns rfabrics are not available in commercial quantities. Overall evaluation on KORUS FTA is considered to be positive. Economically, KORUS FTA is expected to provide good opportunities for Korean companies to access the US market. Politically, Korea and the US can take advantage of KORUS FTA to reinforce the relationship between the two countries.

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Introduction of Yam Bean (Pachyrhizus spp.) in Korea

  • Kim, Sang-Kuk;Choi, Hong-Jib;Won, Jae-Hee;Park, Jun-Hong;Lee, In-Jung;Park, Shin-Young
    • Korean Journal of Plant Resources
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    • v.22 no.6
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    • pp.546-551
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    • 2009
  • We examined the growth characteristics, fresh tuber yield, rotenone content of two yam beans (Pachyrhizus erosus and P. ahipa) introduced from Mexico. P. erosus species showed better adaptable ability than P. ahipa species in seed productivity and tuber yield. Rotenone content in the P. erosus species extracted with chloroform was 3.6 folds much more extracted than ethanol extraction. The order of rotenone content found in crude extract obtained by different solvent extraction from the highest to the lowest was mature seed (484.7 ${\mu}g$) and leaves (17.2 ${\mu}g$) of the P. erosus species, respectively.

Fractionation and Quantitative Analysis of Lipid Components in Korean Yam (Dioscorea) Tubers (한국산 마의 지질 성분의 분리 및 분석)

  • Chung, Hae-Young
    • Applied Biological Chemistry
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    • v.37 no.6
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    • pp.509-515
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    • 1994
  • Using the lipids extracted from Korean yam(Dioscorea) tubers, D. batatas, D. aimadoimo and D. japonica, fractionation and identification of lipid components and their fatty acid compositions were analysed. Lipid contents determined by Folch's method in D. batatas, D. aimadoimo and D. japonica were 11.0 mg/g, 11.4 mg/g and 6.6 mg/g, respectively. Lipids extracted were fractionated into neutral lipid, glycolipid and phospholipid by silicic acid column chromatography. The content of neutral lipid was over about 60% in lipid. Neutral lipid was composed of sterol ester, triglyceride, 1,3-diglyceride, 1,2-diglyceride and monoglyceride. Main constituents of glycolipid were acylsterylglycoside, monogalactosyldiglyceride, sterylglycoside, digalactosyldiglyceride and sulfolipid, and phospholipid contained phosphatidylethanolamine, phosphatidylcholine and phosphatidylinositol. The fatty acids of the total lipid and its three lipid fractions were analyzed by GC. The major fatty acids were palmitic and linoleic acids. Content of the saturated fatty acids was less than that of the unsaturated fatty acids.

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Cultural Practices of Bulbils for Seed-Tuber Production in Dioscorea batatas Decne (마 주아를 이용한 종묘생산 재배기술)

  • Shin, Jong-Hee;Park, Sang-Gu;Park, Sang-Zo;Lee, Bong-Ho
    • Korean Journal of Medicinal Crop Science
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    • v.14 no.3
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    • pp.163-167
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    • 2006
  • The various cultural practices of bulbils were tested for seed tuber production in Chinese yam (Dioscorea batatas Decne.). To obtain amount of seed tuber, yam bulbils were sowed from early April to early May. The late sowing reduced average tuber weight, and consequently the amount of small tubers less than 20g increased highly. The optimum seeding rate of bulbils was 200 kg/10 a for production of seed-tubers. The average tuber weight was decreased according to increasing of seeding rate, so the amount of small tubers among total harvested tubers increased greatly at high seeding rate. Tuber size was affected by bulbil size. Seeding of the larger size bulbils result in increased sprouting rate, each tuber weight and tuber yield per unit area.

Inhibitory Effect of Yam (Dioscorea batatas DECENE) Extracts on the Mutagenicity (돌연 변이원에 대한 마(Dioscorea batatas DECENE)추출물의 억제 효과)

  • 이임선;정세영;신창섭;구성자
    • Korean journal of food and cookery science
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    • v.11 no.4
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    • pp.351-355
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    • 1995
  • The inhibitory effects of methanol, ethanol, chloroform/ methanol and water extracts from natural and cultural yams on the mutagenicity in the cooked pork (broiled and panfried) and the chemically induced mutagen, sodium azide, benzo(a)pyrene and 2-aminofluorene were investigated using salmolla typhimurium TA 100. In the presence of the S9 mixture, ethanol extract from natural yam showed high inhibitory effect on the mutagenicity of the cooked pork. But benzo(a)pyrene, supposed to be produced in mutagen during cooking, did not show high inhibitory effect in same extract. Besids, the yam extract on the mutagenicity of the sodium azide without S9 mixture showed low inhibitory effect. However 2-aminoflourene with S9 mixture showed high inhibitory effect, 91.5%.

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