Meriem CHAFAI MELLOUKI Date: 09-01-2012
The dyeing process existed longtime ago, while it used to be all based on natural sources, the appeal of color is universal, and fabric has been colored for centuries. Some colors, like purple, were so rare and costly that they were reserved for royalty. “Until the mid-nineteenth century, all dye was obtained from natural sources, such as plants and insects.” However, since human have produced artificial dyes to achieve a boarder range colors, for different types of fiber of the textile production process, it has made this business wide successful.
Dyeing is a method, for applying various colors, and their shades on to a fabric; it can be done at any stage of the manufacturing of the fiber. The property of its color and fastness depends upon two factors: The Selection of proper dye and the Selection of the dyeing method. According to the textile material, the dyeing techniques are different for each kind, and so are the steps of getting it done properly. Coloration involves the use of capable dye stuffs of reacting and combining with the textile fiber molecule, usually when in water solution, and usually with other auxiliary chemicals to enhance the process. Dyeing is a method, for applying various colors, and their shades on to fibers, yarns or fabric, where the dye molecule interact with the full fibers of the fabric. Natural dyes:
* Natural dyes are based on Natural sources generally plant so the color is extracted in special conditions depending on each plant, but also can be extracted from insects like the Cochineal. Advantages of using natural dye:
1. Natural dyes are more eco-friendly than the synthetic dyes, as the synthetic dying procedure can be pollutants. 2. Natural dyes are also free from carcinogenic components. 3. Variety: Natural dyes are mixtures of several molecule of colors mainly when making extract we end up with one appearing color while Synthetic dyes have one pure molecule. 4. It is possible to obtain a full range of colors using various mordants. 5. Natural dyes cause no disposal problems, as they are biodegradable.
Disadvantages of using natural dyes
1. It is time consuming to extract from the raw materials. 2. Availability of the natural dyes are limited “growing seasons”. 3. Even though natural dyes produce bright colors and variety of shades but tend to fade faster than the synthetic dyes. 4. Synthetic fibers, which are becoming widely popular can not be dyed with natural dyes. 5. The colors Can not be standardized.
6. Disappearance of the know how, no mass production.
* In the XVII century, the textile industry grow up with the industrial revolution and with it production of chemical dyes to achieve brighter and a wider range of colors for different types of fiber and at different stages of the textile production process, from fibers to yarn till fabric. Advantages of using artificial dyes
* Wide range of bright colors.
* Attending the black color dye which is not easy with natural dyes. * Stander dyes so even dyes use at home will give the same color each time. * Fastness is better with artificial dyes.
* Same machine gives many dyes color with the same color each times not like natural dyes that requires special process for each plant which can be relatively quicker process. * Synthetic fibers can only be dyed by synthetic dyes.
* Mass production wide range of fabric.
Disadvantages of using synthetic dyes
1. Not environmental friendly.
2. The dependency on chemistry.
3. By standardizing the rang of color the synthetic dyeing process is not allowing much experimentation that to some unexpected results of the beauty of nature. 4. The artificial...