الفهرس Only 14 pages are availabe for public view
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Abstract
The roll of dyestuffs Industry in introducing contamination to the environment is increasingly being. Many synthetic dyes may lead to various harmful by-products during their manufacturing. In recent years, people have realized the utility of natural dyes and moved towards them with a scientific background. Natural dyes exhibit better biodegradability and generally have a higher compatability with the environment.
The majority of natural dyes need a mordant In the form of a metallic salt to create an affinity between the fiber and the pigment. The only problem with natural dyes is that to obtain a full colour range, mordants must be used and whilst, natural dyes are themselves harmless, the chemicals used for mordanting are generally not environmentally acceptable.
Aim of work:
Printing wool and cotton fabrics with colouring species present in three different natural dyes namely: madder, safflower and onion.
Using eco-friendly fixing agents to Improve the fastness properties of the natural fibers printed with the three natural dyes, instead of using harmful metallic salts.
Investigating in details, the variable parameters influencing the resulted prints besides an evaluation of the fastness properties of the optimum results.
This research is divided Into three essential parts, the general part, the experimental part and results & discussion.
Firstly: The general part consists of three chapters:
Chapter 1: Cotton fibers.
Chapter 2: Wool fibers.
Chapter 3: Natural dyes.
Secondly: The experimental part whichh includes:
1- The materials used throughout this work: fabrics natural dyes, thickening agent, chemicals and auxiliaries.
2- Procedures which consist of the preparation of plant materials, fabrics, printing pastes and washing off the prints.
3- The factors studied through this work.
4- Measurements and analysis applied on the printed wool and cotton samples.
Thirdly: The results and discussion part whichh includes all the obtained results in the shape of tables and figures with comments and explanations to determine the optimum conditions that lead to achieve the aim of the work.