• Title/Summary/Keyword: Natural indigo

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Analysis of the Textiles Design of Natural Indigo Dyed Products in Korea and Japan -Focusing on the Natural Indigo Dyed Products of Internet Shopping Malls- (한국과 일본의 쪽 염색 제품의 텍스타일 디자인 비교 -인터넷 쇼핑몰의 쪽 염색 제품을 중심으로-)

  • Lee, Mi-Suk;Chung, Kyung-Hee
    • Journal of the Korean Society of Clothing and Textiles
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    • v.35 no.3
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    • pp.359-370
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    • 2011
  • This study analyzes the textiles design of natural indigo dyed products in Korea and Japan. In this study, a total of 556 Korean natural indigo dyed products, and 2,730 Japanese natural indigo dyed products were used for analysis. The subjects of this study were 556 natural indigo dyed products and 2,730 Japanese natural indigo dyed products selling natural indigo dyed products which were found using search engine keywords of natural indigo dyeing and natural dyeing. Research and analysis was treated regarding the products, items, patterns, and the representation techniques of the patterns. The results of this study are as follows. In the pattern used for natural indigo dyed products, 71.4% of Korean products have no pattern, but 77.1% of Japanese products have patterns. On the representation techniques of the patterns, Korean products used tie-dyeing and a dip patterned fabric. While in the Japanese products, the most frequent patterning techniques were paraffin dye, followed by tie-dyeing, yarn-dyed and weaving, screen printing, and yarn-dyed and knitting. Regarding the kinds of patterns for natural indigo dyed products, only 8 kinds of patterns were used in Korean products; however, over 50 kinds of various patterns were used in Japanese products. Most patterns in the Korean products were ion patterns made by tie-dyeing. While in the Japanese products, the most frequent patterns were stripe patterns, followed by flower, dot, and ion patterns. Based on these research results, the problems of the textile design of Korean natural indigo dyed products were that most of the products have no pattern, and even though there were patterns, they lacked variations between the products. While in the case of Japan, they used the traditional and modem patterns of various textile representation techniques.

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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Dyeing properties and colorimetric characteristics for cellulose fabrics dyed with indigo by different reducing conditions (쪽 염료의 환원조건에 따른 섬유소 직물의 염색성과 색채특성)

  • Shin, Judong;Choi, Jongmyoung
    • The Research Journal of the Costume Culture
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    • v.24 no.6
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    • pp.777-787
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    • 2016
  • This study was carried out in order to provide useful data for planning fabrics of summer eco-friendly fashion products. The fabrics used in this study were four cellulose fibers: cotton, cotton/mulberry blended, flax, and flax/lyocell blended. Dyeing with natural indigo was carried out under three different reducing conditions (i.e., general, eclectic, and eco-friendly) that have different reducing agent and pH levels, and hydrosulfite and glucose were used as a reducing agent. The dye uptake (K/S value) of fabrics dyed with natural indigo by a reducing condition was the highest at 660nm. Regardless of the fabrics, dye uptake was the highest under the general reducing condition and the lowest under the eco-friendly reducing condition. Under different reducing conditions, the dye uptake of natural indigo fabrics with the maximum absorption wavelength indicated a difference. The colorfastness of cellulose fabrics that were dyed with natural indigo had a rate of 4 to 5 except for rubbing fastness, which indicated good colorfastness. Additionally, natural indigo-dyed cotton and flax fabrics had good antibiosis. When the color characteristics of fabrics dyed with natural indigo were measured, all of the three reducing conditions created purple blue (PB) colors, and the color characteristics of dyed fabrics by reducing condition and fabric showed significant differences.

Natural Indigo Dyeing of Wool by the One Step Reduction/Dyeing Method (일단계 환원/염색에 의한 모직물의 천연인디고 염색)

  • Son, Kyung-Hee;Shin, Youn-Sook;Yoo, Dong-Il
    • Journal of the Korean Society of Clothing and Textiles
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    • v.34 no.3
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    • pp.508-517
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    • 2010
  • One-step reduction/dyeing method was optimized for wool dyeing with natural indigo dye in this study. The effects of reduction/dyeing conditions including dye temperature and time, the pH of bath, concentration of dye, and reducing agent on dye uptake and color were investigated. The dye uptake was higher with no addition of alkali. Dyeing was carried out through the use of only sodium hydrosulfite in the bath. The maximum dye uptake was obtained at $60^{\circ}C$ for 30min and the dyed fabrics appeared in the PB Munsell color range. Dye uptake improved with the increase of a natural indigo dye concentration with the same sodium hydrosulfite concentration. At a higher dye uptake, the fabric color became more purplish and the maximum absorption shifted from 660nm to 620nm. Color reproducibility was reliable with a color difference in the range of 0.41~1.43. Regardless of color strength, washing and dry cleaning fastnesses were good with a 4/5 rating, and fastnesses to rubbing and light were acceptable with a 3/4~4 rating.

Study on the Direct Printing of Natural Indigo Dye on Cotton Fabric Using Arabic Gum (아라비아 검을 이용한 천연 쪽 염료의 면직물에 대한 직접 날염 연구)

  • Li, Longchun;Ahn, Cheunsoon
    • Journal of the Korean Society of Clothing and Textiles
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    • v.41 no.2
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    • pp.212-223
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    • 2017
  • This research investigated the screen printing method for natural indigo dye on cotton fabric. We examined four types of thickening agents (arabic gum, guar gum, indalca, and CMC) based on their ability to retard the oxidation of natural indigo print paste while the paste remained on the screen frame. The results indicated that the retardation of arabic gum towards oxidation was the greatest among the four types of thickening agents. The highest K/S value of the printed cotton was observed with a dye concentration of 50g/L fermented indigo powder. The best printing results were obtained when the duration of dye efficiency was tested for the 10 minutes of the dye paste remaining on the screen with a thickening agent concentration of 26.56% that represented 530 cps viscosity. The test of colorfastness to washing and rubbing of the printed cotton resulted in grade 5, and the colorfastness to sunlight resulted in grade 4. Chinese traditional Naminwhapo printing was reproduced on cotton fabric using the natural indigo printing method derived from this study.

A Study on the Dyeing Characteristics of Natural Dyes(II)-Expansion of Color Range of Natural Dyes by Mordanting and Combination Dyeing- (천연 염료의 염색 특성에 관한 연구(II)-매염제와 혼합 염색을 이용한 색상 다양화-)

  • 임경율;전택진;윤기종;엄성일
    • Textile Science and Engineering
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    • v.38 no.11
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    • pp.577-588
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    • 2001
  • To obtain a full range of colors on cotton, wool and silk fabrics with natural dyes, mordanting and combination dyeing were carried out. Tannic acid and metal compounds containing copper, tin, iron, nickel, chrome and alum were used as mordanting agents. Palmatin, red wood and natural indigo dyes were used as the three primary colors for combination dyeing. After mordanting, the colors of fabrics dyed with natural dyes changed. In combination dyeing of palmatin/red wood and palmatin/natural indigo, the two component natural dyes showed good miscibility in dye bath and various colors were obtained according to the content of dyes used. In combination dyeing of red wood and natural indigo, the various colors were not obtained due to gelation in dyebath. This problem could be solved by dyeing with indigo, mordanting then dyeing with red wood. Violet color was obtained by alum mordanting and gromwell dyeing. The expansion of color range of natural dyes by mordanting and combination dyeing has been demonstrated.

Optimization of Silk Dyeing with Natural Indigo (천연인디고를 이용한 견직물 염색의 표준화 연구)

  • Son, Gyeong-Hui;Sin, Yun-Suk;Ryu, Dong-Il
    • Proceedings of the Korean Society of Dyers and Finishers Conference
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    • pp.102-104
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    • 2008
  • Natural indigo dye was prepared by extracting from Polygonum tintorium, precipitating with calcium hydroxide, and dried. Dyeing was carried out using sodium hydrosulfite as a reducing agent for the prepared natural indigo powder. K/S value, color property, and colorfastness of dyed fabrics were investigated. Optimum dyeing conditions obtained were 60$^{\circ}C$, 20min. Regardless of indigo dye and sodium hydrosulfite concentration, Munsell hue of dyed fabrics was PB color. Compared to the dyed fabric with both sodium hydroxide and sodium hydrosulfite, those with sodium hydrosulfite only showed higher color strength(K/S value). Colorfastness of dyed fabrics showed high rating except of wash/dry cleaning fastness of silk fabrics dyed low color strength.

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Natural Indigo Dyeing on Wool Fibers (I) (천연 쪽을 이용한 양모 섬유의 염색 (I))

  • 강지연;유효선
    • Textile Coloration and Finishing
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    • v.13 no.4
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    • pp.241-248
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    • 2001
  • Natural indigo dyeing has been used mainly on cellulosic fibers and silk during the course of history in Korea. In order to extend the usage of this one of the most important natural dyes, its dyeability on wool fabrics has been studied to find out the optimum dyeing condition for wool fiber which is susceptible to alkaline medium. The dyeing method used was hydrosulphite vat of extracted dye. K/S values of dyed fabrics were investigated to analyze the dyeability of natural indigo on wool fibers and colors were measured through $L^*,\;a^*,\;b^*$ and Munsell Values. Highest K/S values were obtained at the temperature of 60(C and pH 7 to 8. The Munsell Values for hue of wool fabrics dyed with extracted indigo powder using hydrosulphite vat fell mostly in PB range. As the dyebath pH increased, blueness increased. Different dyeing conditions resulted in change of colors of dyed fabrics due to the difference in amounts of indigotin and indirubin contents within the dyed fiber as shown by HPLC.

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Process Balance of Natural Indigo Production based on Traditional Niram Method

  • Shin, Younsook;Yoo, Dong Il;Kim, Kangwha
    • Textile Coloration and Finishing
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    • v.24 no.4
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    • pp.253-259
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    • 2012
  • In this work, the natural indigo production process from Polygonum tinctorium was balanced based on the traditional Niram method in Korea. A standard procedure was determined considering the conditions of indican extraction from plant material, the amount of alkali for precipitation, storage of extract, etc. The effect of experimental conditions on the yield of crude dye was investigated. The contents of indigo and indirubin of the crude dyes were analyzed by HPLC. Increase of the amount of crude dye was observed within 1-2.5 days of extraction time. Longer extraction beyond 2.5 days resulted in a slight decrease in the amount of crude dye. There was no consistency in terms of indigo content depending on extraction pH. We found that the storage of extract or harvested plants affected adversely to dye yield and dye quality. Based on the lab scale extraction, large scale extraction was performed for 2-2.5 days in water and 2.0-2.5 g/L of $Ca(OH)_2$ was applied for precipitation of indigo dye. We obtained natural indigo dye containing about 15% of pure indigo in scale-up production using whole plant except root.

Effect of Reducing Agent, Sodium Hydrosulfite on the Natural Indigo Dyeing of Silk Fabric (환원제 Sodium Hydrosulfite를 이용한 천연쪽의 견 염색효과)

  • 정인모;우순옥
    • Journal of Sericultural and Entomological Science
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    • v.44 no.2
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    • pp.93-98
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    • 2002
  • Effect of reducing agent sodium hydrosulfite on the natural indigo on the silk fabrics were examined to improve traditional dyeing method. K/S values of dyed fabrics was monitored with various dyeing temperature time, amount of dye and reducing agent. The dyeability of silk fabrics was improved by using reducing agent, sodium hydrosulfite; K/S value (7.20) was higher then that (1.09) of traditional method at the frist dyeing. Natural indigo dye extracted from dyed silk fabrics are composed of isomer, indigo (67.3%) and indirubin (32.5%). However, silk fabrics showed excellent anti-microbial activity regardless of the dyeing methods.