7 research outputs found
Extraction of natural dyes as textile colourants from kitchen wastes
This research study focuses on the dyeing of cellulosic fabrics with aqueous extracts from two different domestic wastes. Two
methods of dyeing (i.e. with mordanting and without mordanting) were carried out on cotton fabrics. The extraction of brilliant
brown and red colours from kitchen wastes is of particular interest. Colouring matter from used tea leaves (Camellia sinensis!
and big onion (Alium cepa) skin were extracted and dyeing tests were performed. Colour strength, shade and fastness
properties of the dyeing were tested. The extracts were applied under optimum conditions with one synthetic mordant (CuS04)
and two natural mordants (Sepalika (Nyctanthes arbor-tristis) and Aralu (Terminalia Chebula)). The results prove the
potential of such wastes as a source for natural dye extraction. To obtain textile dyeing with acceptable fastness properties.
however, rigorous selection of dyes and development of suitable processes are required
Investigation of high volume bio materials as potential colourants and finish chemicals for fibrous substrates
The modern consumer (1990 onwards) is aware of the toxic chemical residues on textiles/garments (resulting from dyes and chemicals used) which can have carcinogenic/ dermatological and allergic effects on the wearer, especially because textiles are in contact with human skin for 24 hours of the day. The second aspect deals with the 'pollution' (air/water) at each of all stages in production of textiles. The
third concern is about the 'ecological' problems during disposal (of garbage / on incineration).
The aim of this research is to show feasibility of producing high quality natural dyes from plants, creating new opportunities for both farmers and the fabric / garment industry in line with the current consumer trends towards eco-friendly natural products. The direct national benefit is shown. Environmental and economical factors too need to be considered to make this viable in the long run.
Investigation of the traditional dyeing techniques and dye producing plants with special reference to Sri Lanka, and development of natural dyes and investigation of
their suitability as textile dyes were the two major objectives of this research study.
Research investigations based on the comprehensive analysis of 10 best dye yielding
plants which have been chosen from 47 dye yielding plants in Sri Lanka are presented. The available raw material spectrum had been reviewed. The ten (10) selected species are Kothala Himbutu (Salacia reticulata), Weniwal tCoscinium fenestratum), Rambutan (Nephelium lappaceum), Mangus tGarcinia mangostana), Big onion skin (Allium cepa) , Marigold (Tegetus erecta), Tea (Camellia sinensis), Jak (Artocarpus heterophyllus), Walmadata (Rubia cordifolia) and Turmeric (Curcuma domestica). Some of the above plant extracts have not been used before in textile dyeing.
Environmental performance was another aspect of the research. Results from effluent
characteristics of best dyeing solutions reveal significant reduction in pollution potential. The concept of ready to use dye concentrates is also presente
An analysis of environmental performance of natural dyes
The objective of this study is to demonstrate the limited heavy metal content in natural dyes (ie to demonstrate near zero
burden on the environment) and the final effluent COD (to test the hypothesis that the effluent is less problematic and therefore
easy to treat). For the selected material both hypotheses have been demonstrated. Characterisation of eco -friendliness of
natural dyes reveals that no major harm is caused to the environment when compared with the synthetic dyes
Influence of enzyme and chemical pretreatment processes on the colours of banana fibres
Colour is an important property of textile fibres.
The colour of mechanically extracted fibre affects the colour of
the fibre textiles products. The focus of this investigation is to
compare the colour of different pre-treatment process for banana
fibre and evaluate the suitability of the banana fibre treatment
methods for dyeing process. Experimental research strategies were
used to investigate the colour properties. Ambun (AAA/Cavendish)
banana variety was selected for this research study. Treated and
mechanically extracted banana fibre samples colour measurement
was performed by using a data colour machine 600
spectrophotometer and assessed using CIELAB colour values.
This experiment was conducted to the suitability of the banana
fibre extraction methods for dyeing process. Results indicate that
there is a significant change in colour due to the different
treatments achieved higher ΔE values. Treatment of enzyme and
6% H2O2, 2% Na2SiO3, 3% NaOH, combined experiments shows
higher ΔE values than the other treatments. The FTIR results
show that the removal performance of the lignin component is
satisfying after the enzyme and chemical combined treatments of
banana fibres
The Buddhist robe: The path pointing to natural dyes and possible establishment of a natural dyeing industry in the apparel sector of Sri Lanka with special reference on the Buddhist robe
It gives us pleasure to release this writing as a complete intensive study on
the greatly unexplored area of the Buddhist Robe for the benefit of the researchers
and for the University undergraduates verifying and identifying how natural dyeing
plays a pivotal role in colouration in ancient context which signified much with
its eco-friendly nature, what is commonly discussed and falls into sustainable
practices.
The Buddhist Robe: the path pointing to natural dyes and possible
establishment of a natural dyeing industry in the apparel sector of Sri Lanka with
special reference on the Buddhist robe is a scholarly work is the first of a series
intended primarily as a invaluable reference source book for undergraduates of our
Universities. This is a totally a practical guide in applying how the related natural
colour substances apply to real life situations like offering Kaṭhina Cīvara Pūjā by
colouring natural dye stuffs, since Professor Samudrika devoted more than 15 years
exploring, experimenting and specializing in natural dye stuffs creating a path way
for many followers by taking the initiative to invoke the imperative provisions
of natural dyeing for the benefit of the textile sector meeting the expectations of
the sustainable practices which recover through the proper application of natural
dye stuffs which are available to us. The page by page coverage of the Sri Lankan
Buddhist robe dye history with sumptuous imagery and experts’ accessible guide to
the natural dye tradition of the country. This will serve as a great reference for not
only for undergraduates who involve in the appreciation of natural dye traditions
of Sri Lanka but also for academics who teach the subject and researchers who are
involved in the respective fields. Combining contextual facts impact with cultural
significance, the traditional robe dye adorns all types of surfaces from discarded
cloth to refined cotton cloth.
This scholarly work reflects this ubiquity by presenting a biography of dye
forms in a different way – painted, literal and laboratory status of dye particles.
Chapter one contains the uniqueness of Sri Lankan dye stuffs spread throughout
history where natural dyes are plucked from history brought to the fore with essential
details isolated and framed. This permits a detailed research of how natural dye
systems become of a part of Buddhist traditional practice and culture of the country.
Further this work discovers intriguing cultural elements and connections, which
are based on original references too. This is an overview and an in-depth research
of the robes worn by the Buddhist monks with its cultural context in relation to the
great chronicle of Mahāvaggapāli, Vinaya-piṭaka of the Pali Canon in its 8th chapter:
‘Cīvarakkhandakaya’ describes the robe of Buddhist priests and its traditional
practices. The second chapter is dedicated to establish a historical representation
of the Buddhist robe emerging in the socio-cultural context in terms of developing
its visual and figurative aspects discussed with an array of visuals depicted in Sri
Lankan temple paintings. The third chapter highlight the art of traditional dyes
in Sri Lanka with its colour substances, methods, materials and some significant
dye recipes based on well proven literary facts. The fourth chapter considers the
scientific clarification of the methodology of robe dyeing and its characteristics
under set laboratory condition
Extraction, isolation & identification of colouring substances in local natural dye yielding plants
This paper is based on the extraction, isolation and identification of yellow dye pigments present in jak saw dust (Artocarpus
heterophyl/us) by solvent extraction method. Six natural dye yielding plants were selected (Teak, Betel, Jak, Neem, Rambutan,
and Jaman) to identify the best dye yielding plant. Dyeing trials were carried out to find conditions of optimum depth and
stability. Extracts from the Jak gave the best dye shade on mercerized cotton fabric with best performances. This Plant is
abundantly available throughout in Sri Lanka. It has been reported that heart wood of jak fruit tree contains many
flavonoids.(l
Development of a new scouring methodology for the textile industry
Scouring is one of the most important processes in fabric formation in the textile industry. The main function of scouring is the removal of hydrophobic impurities in fabrics made out of natural fibers. Normally scouring is done after the sizes are removed in the desizing process. Three main scouring methods can be identified in the current textile
industry. Alkaline scouring, Bio scouring, Solvent scouring are those three main methods with the alkaline scouring being the traditional and widely used method. In this research the drawbacks of the existing scouring methods have been discussed under three main aspects which are efficiency, economy and environmental friendliness. Neither of the
above three scouring methods satisfy all these three aspects, at least up to a reasonable level. In order to achieve all these three objectives concurrently, development of a new process by combining existing methods was focused on in this research. This approach has not been followed in the past. Under this project, combining of Alkaline scouring with
Bio scouring and Solvent scouring were separately considered as the approach of the research. Widely used Alkaline (NaOH) scouring method has been chosen as the reference method and aspects of this method were compared with experimental results. Recipes were developed according to general requirements of combining agents and tested with 100% cotton twill fabric and results were analyzed. Within all tested recipes the most suitable combination was finalized with necessary conditions in order to achieve better results in terms of efficiency, economic and environment friendliness compared to the reference methodology