CONNECTION OF INDIGO RING DYEING OF COTTON YARNS WITH DECOLORIZATION BY CO2 LASER

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F46747885%3A24410%2F17%3A00004849" target="_blank" >RIV/46747885:24410/17:00004849 - isvavai.cz</a>

Result on the web

<a href="http://vat.ft.tul.cz/Archive/VaT_2017_3.pdf" target="_blank" >http://vat.ft.tul.cz/Archive/VaT_2017_3.pdf</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

CONNECTION OF INDIGO RING DYEING OF COTTON YARNS WITH DECOLORIZATION BY CO2 LASER

Original language description

Investigation the influence of indigo dye penetration depth into cotton fabric on decolorization of samples using CO2 laser treatment is the main goal of this research. Due to various setting of pH values, it is possible to obtain uniform distribution of indigo in cotton fibers or ring dyeing in yarns (surface dyeing). It has been concluded that indigo can be deposited in various penetration depths of yarns. In this study pH values were set up to 8, 9, 10 and 11.8. Penetration depth of indigo into cotton yarn was analyzed by microscopic method in both cross sections of yarns in warp and weft directions. Pulsed CO2 laser was used for decolorization of indigo dyed cotton fabric. Various values of marking speed were used to obtain different laser power densities. Marking speed was set up in range of 50 - 400 bits.ms-1. Morphological changes of irradiated indigo dyed cotton fabric were observed by SEM (scanning electron microscopy) analysis. Color shade changes of indigo dyed cotton fabrics after laser treatment were objectively measured by UV-VIS Reflective Spectrophotometer. The results showed that, changing the pH values from 10 up to 11.8 was very effective for indigo dye uptake by cotton fabric. Light color shades of indigo dyed cotton fabric were obtained with lower pH values (pH 8 and 9) during dyeing. It is cause of lower solubility of indigo in water at neutral medium. The penetration depth of indigo dye was 35 μm into cotton fabric at pH value of 8. The depth of indigo penetration into cotton fabric was 60 μm at pH value of 11.8. The decolorization of indigo dyed cotton fabric is very effective by infrared laser beam. The results show that, penetration depth of indigo into cotton yarn does not play any role on decolonization of cotton using laser. For decolorization of indigo dyed cotton fabric, the saturation of coloration has higher influence than penetration depth of indigo into the yarn. Also the yellowing index of fabrics after laser treatment can be attributed to their initial color shade. Partly decolorization of indigo from dyed cotton samples is caused by high value of marking speed (400 bits.ms-1) during laser treatment. Total decolorization of indigo from dyed cotton samples was obtained by low value of marking speed (50 bits.ms-1). Untreated cotton fibre is smooth. From SEM analysis, there are no pores. But with the increasing laser intensity (decreasing marking speed) there are cracks and pores on the surface of the fabric. Infrared laser beam is effectively absorbed by fiber system. The depth of penetration of infrared laser beam is much lower into the fiber system, at the most two layers of fibers. It is also lower than penetration depth of indigo. And that is why penetration depth of indigo into the yarn has small effect on the efficiency for decolorization of cotton textile by infrared laser beam.

Czech name

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Czech description

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Type

J_SC - Article in a specialist periodical, which is included in the SCOPUS database

CEP classification

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OECD FORD branch

20503 - Textiles; including synthetic dyes, colours, fibres (nanoscale materials to be 2.10; biomaterials to be 2.9)

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Fibres and textiles (Vlákna a textil)

ISSN

1335-0617

e-ISSN

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Volume of the periodical

24

Issue of the periodical within the volume

3

Country of publishing house

SK - SLOVAKIA

Number of pages

7

Pages from-to

3-9

UT code for WoS article

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EID of the result in the Scopus database

2-s2.0-85026646080