• Title, Summary, Keyword: Silk

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Effect of treatment temperature on mechanical properties of silk textiles made with silk/polyurethane core-spun yarn

  • Bae, Yeon Su;Um, In Chul
    • International Journal of Industrial Entomology
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    • v.33 no.2
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    • pp.108-112
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    • 2016
  • Silk has been used extensively in textile applications because of its good luster and feel. However, the low elongation and elastic recovery of silk has limited its use in a wider variety of textile applications. In this study, silk textile samples were made with a highly twisted silk/polyurethane core-spun yarn. They were immersed in water and dried at different temperatures, and the effect of treatment temperature on the mechanical properties of the silk textile was examined. It was found that the water temperature strongly affected the morphology and mechanical properties of the silk textile, whereas the drying temperature did not. As the water temperature was increased, the weft silk yarn became tangled and the interval between warp yarns decreased, resulting in shrinkage of the silk textile. When the silk textile was immersed in water at high temperature (i.e., $100^{\circ}C$), the elongation of the textile increased eight-fold as compared to an untreated silk textile. The maximum elastic recovery ratio of the silk textile was 96.7%.

Dialytic pH Condition for Obtaining Silk I Type Structure (Silk I형 결정을 얻기 위한 투석의 pH조건)

  • ;小西 孝
    • Journal of Sericultural and Entomological Science
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    • v.39 no.1
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    • pp.67-72
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    • 1997
  • As a condition for obtaining the silk I type crystal that has stability and high reproducibility, after dissolving silk fibroin crystalline part (Fcp), the changes of recrystallized crystal structure according to dialytic pH were examined by x-ray diffraction and differential thermal analysis. The Fcp was obtained from the aqueous solution of silk fibroin enzymatic proteolyzed by chymotrypsin. The crystal structure of Fcp showed silk II type. When the Fcp was dissolved by 10M LiBr aqueous solution, the Fcp1 showed the silk II type at pH 9. However, besides the silk II type, the silk I type structure begins to appear at pH 8 and only the silk I type structure was found below pH 6. On the other hand, the Fcp2 that calcium chloride was used in the dissolution found only the silk I type crystal structure below pH8.

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Dyeing Research of Silk Color Code for Efficient Color Management in Silk (실크산업의 효율적인 색채관리를 위한 실크 컬러코드의 염색 연구)

  • Lee, Kyung-Hee
    • Fashion & Textile Research Journal
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    • v.6 no.6
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    • pp.785-798
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    • 2004
  • Silk has always been coveted as the finest and richest of all fibers woven into cloth. The earlist woven silk fragments found to date come from the third century B.C. The filament created and spun into cocoon by the larva of the silk moth, silk was exported from China to Europe from as early as the third century B.C. Silk industry is export leading industry that guide national textile industry development after the 1960s in Korea. Korean silk industry reached to peak at 1975 is displaying appearance that export scale is decreased recently. Various kinds methods can be proposed for high value added in silk industry, the research about color is essential. The importance of color is increasing in modern textile and fashion industry. Color is important factor of textile and fashion industry because color affects strong influence in human's sensitivity. Silk fabric can give high added value developing high sensitivity color because dye ability is superior. In this study I planned the "Utility Silk Color Code 288" for efficient color management in silk industry. "Utility Silk Color Code 288" are attached the Munsell notation and dyeing data which can reappear the color when needed. This research constructs for insufficient domestic color infrastruction and expect that basic role to develop the competitive power for Korean silk industry.

Effect of Surfactant on Homogeneity of Partially Degummed Silk Fiber

  • Chung, Da Eun;Um, In Chul
    • International Journal of Industrial Entomology
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    • v.28 no.1
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    • pp.19-24
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    • 2014
  • Silk has always been one of the most favored textile materials. Fully degummed silk fiber (i.e., silk fibers without sericin) shows better luster than raw silk fiber (with sericin); it is also softer. On the other hand, raw silk fiber feels cooler because of the presence of sericin, making it useful as a textile for the summer season. Recently, partially degummed silk has attracted researchers' attention because it provides better luster, feel, and dyeing properties. However, the partial degumming of silk is very difficult because it results in inhomogeneously degummed fiber. In the present study, silk yarns were degummed with surfactant aqueous solutions and the effects of each surfactant on the degumming ratio, crystallinity, and homogeneity of the degummed silk yarn were examined. The degumming ratio and crystallinity index of silk yarn varied depending on the type of surfactant. On the whole, anionic surfactants resulted in higher degumming ratios and better homogeneity than nonionic surfactants.

Silk Filament Progression with Backcross Breeding Generations in Tropical Tasar Silkworm, Antheraea mylitta D

  • Reddy, Rangareddygari Manohar;Suryanarayana, Nagabathula;Sinha, Manoj Kumar;Gahlot, Nand Singh;Hansda, Ganga;Ojha, Nand Gopal;Prakash, Nanjappa Basappa Vijaya
    • International Journal of Industrial Entomology
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    • v.19 no.1
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    • pp.187-192
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    • 2009
  • Silk filament progression study applying backcross breeding with recipient parent Jata and donor parent Daba ecoraces of tropical tasar silkworm, Antheraea mylitta Drury conducted during 2006 to 2008, revealed introgression of filament denier (10.2 d) superior to both parents at BC4 level. Also, the silk waste (0.35%) and filament breaks (2.6 nos) were reduced compared to both parents, while the filament length (973 m) and non break filament (296 m) improved over donor and could attain closer to recipient parent. The best performance of Jata $\times$ Daba at F1 level, with highest silk filament length (1646 m) of 12.5 d denier, denotes heterosis impact on silk trait with parental heterogenousity, an advantage to exploit silk filament yield. The progression of quality in terms of finer filament denier, less silk waste and least number of filament breaks over both parents and improvement in filament length and non break filament over donor parent except for a marginal shortage against recipient at BC4 level indicates the prospects of Jata and Daba ecoraces as source of breeding material for qualitative improvement of tasar silk filament. The study suggests that the commercially important finer denier of tasar silk filament can be attained with minor reduction in silk yield of wild Jata ecorace by adopting repeated backcrossing for four generations with semi domesticated Daba ecorace.

The Physical Properties and Dyeability of the Degummed and Sericin Fixed Silk Fabrics (정련 및 세리신 정착처리 견직물의 물리적 성질과 염색성)

  • 이은미;이혜자;유혜자
    • Journal of the Korean Society of Clothing and Textiles
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    • v.27 no.5
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    • pp.517-523
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    • 2003
  • We studied the physical properties of silk fabrics after degumming, the dyeability and the color fastness of silk fabrics after degumming and sericin fixing. As the sericin was removed from silk fabrics, the rate of weight loss increased and both the abrasion resistance and the drape coefficient decreased. This means that the amount of the sericin remained in silk fabrics significantly affects the physical properties of silk fabrics. On the surface and the cross-section of silk fabrics, the silk fibers enclosed by the sericin seemed to be in a lump shape. Each fibroin strand, however, got scattered, as the process of degumming went through. The dyeability of silk fabrics degummed decreased at between 20$^{\circ}C$∼80$^{\circ}C$ the dyeing temperature, on the other hand, it significantly increased over 80$^{\circ}C$. The dyeability of the sericin-fixed silk fabrics was lower than that of the non-serin-fixed silk fabrics, to a little extent. The colorfastness of crocking in the dyed-silk fabrics was a little low and that of the sweat was much lower in a basic sweat. Especially, the colorfastness of the partially degummed silk fabrics was low, because the sericin was not stable in the condition of sweat. Therefore, the process of sericin fixing is essentially required, for the partially degummed silk fabrics and the process of degumming itself.

Transition of Silk Fibroin by Enzymatic Reaction (효소반응에 의한 견피브로인의 전이)

  • Kim, Dong-Keon;Choi, Jin-Hub;Konishi, Takashi
    • Journal of Sericultural and Entomological Science
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    • v.39 no.1
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    • pp.73-78
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    • 1997
  • The crystalline fraction of silk fibroin (Fcp) was obtained from the aqueous solution of silk fibroin hydrolyzed by $\alpha$-chymotrypsin. The molecular weight of Fcp was found approximately 7000 by using high speed GPC. On the other hand, a high molecular weight of PIFcp product could be obtained by the reverse reaction of enzymatic proteolysis of Fcp precipitates. Some parts of this PIFcp have the molecular weights of approximately 17000 and 24000. As a result of x-ray diffraction analysis, the crystal structure of Fcp and PIFcp was turned out silk-II type and silk-I type, respectively. Upon the reverse reaction of enzymatic protelysis, the structural transition occured from silk-II type to silk-I type crystal for the most of Fcp precipitates. It was confirmed that PIFcp might be somewhat stable crystal structure of silk-I type according to the thermal analysis as well as x-ray diffraction method.

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A Study on the Manufacturing of Stretch Silk Fabrics (I) - Effect of Processing Condition of Covered Yarn - (스트레치성 실크직물 제조에 관한 연구(I) -커버링사 공정 조건의 영향-)

  • Kwon Soon-Jueng;Jin Young-Gil
    • Textile Coloration and Finishing
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    • v.18 no.2
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    • pp.31-38
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    • 2006
  • Silk fabrics are very popular and widely used because of their elegant appearance. However, silk fabrics generally have easy wrinkle, and do not stretch and deform permanently after machine washing. Then the stretched properties of silk fabrics are important for the application of industrial textile materials such as formal and sports wear. Thus, this research surveys the covering, weaving and degumming conditions for stretched silk fabrics. As a result, yarn breaking stress was reduced with increasing spindle speed, and the yarn twists were optimized under the covering condition of polyurethane/silk with PVA pretreatment. In addition, the shrinkage of the silk fabrics treated with star degumming process was reduced by continuous NaOH degumming process. The fabrics showed the fabric physical properties with optimum stretched properties and evenness surfaces.

Studies on Silk Fibroin Membranes(I) -Structure of Silk Fibroin Membranes and Their properties- (Silk Fibroin 막에 관한 연구(I) -Silk Fibroin막의 구조특성-)

  • 최해욱;박수민;김경환
    • Textile Coloration and Finishing
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    • v.6 no.1
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    • pp.62-70
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    • 1994
  • Silk fibroin was dissolved in 9.3 M LiBr aqueous solution at 4$0^{\circ}C$ for 1 hour. The dissolved silk fibroin was regenerated by casting the dialyzed solution into the membrane. The freshly prepared silk fibroin membrane was soluble in water and was. mainly consisted of random coil conformation. By the treatments in saturated water vapor at 3$0^{\circ}C$ and in 75% ethanolic aqueous solution (V/V), the insoluble membranes were obtained and the structure and morphology of those were investigated for the structure by means of X-ray diffraction analysis, infrared spectroscopy, thermal analysis. Rheovibron and scanning electron micrograph. Silk II type crystals were obtained by treating amorphous silk fibroin membrane in the random coil conformtion with 75% ethanol solution(V/V). Crystallization to silk II type crystals occured even after a few minutes, and a large number of silk II type crystals were formed after 30 mins. On the other and, the membrane treated in saturated water vapor was composed of the mixtures of silk I and silk II type crystals. A large number of silk I and silk II type crystals were formed after 24 hours. The micro brownian motion in the amorphous regions of silk fibroin membrane started at about 175~185$^{\circ}C$. $\alpha$ dispersion appeared at about 20$0^{\circ}C$ in the amorphous membrane, and at about 22$0^{\circ}C$ in the crystalline membrane. The crystallization of random coil conformation to silkII type crystals occured at about 215$^{\circ}C$. The surface, bottom and cross-section of the membranes were observed by scanning electrom microscope. Fine forms alike spherulites appeared at the surface of crystalline membrane.

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