What is the process of bleaching?
Bleaching is the process of decolorization of raw textile material by removing inherent and or acquired coloring components from the fiber. It provides base whiteness to the textile material which could be further whitened with the help of optical brighteners or dyed | printed depending on the desired end use.
What is bleaching of silk?
Silk is a soft, delicate fabric that needs special care. Chlorine bleach weakens or disintegrates certain fabrics and cannot be used on silk. Instead, hydrogen peroxide is a readily available substitute for chlorine bleach. Use peroxide to remove color from your silk.
What are the main objectives of bleaching process?
The main objectives of bleaching are to get a sufficiently high and uniform degree of whiteness in the textile materials. To get a high and uniform absorptivity in the textile materials. Bleaching agent occur some damage to the textile materials. So bleaching must be accompanied with minimum fiber damage.
What is scouring and bleaching?
Scouring: Scouring is a process of removing impurities such as oil, wax, fats, dust and dirt from textile material to make it hydrophilic. Bleaching: Bleaching is the destruction of natural coloring(Gray) matters to produce a white material.
Why bleaching is done?
Skin bleaching reduces the concentration or production of melanin in the skin. Melanin is a pigment produced by cells called melanocytes. People with dark skin have more melanin. Hormones, sunlight, and certain chemicals also affect melanin production.
What are the two types of bleach?
There are only two main types of bleach to choose from when you are deciding which bleach to use on your laundry: chlorine bleach and oxygen bleach. However, there are also natural items that have bleaching power and can act as bleaching agents.
How do you make a bleaching agent?
The raw materials for making household bleach are chlorine, caustic soda, and water. The chlorine and caustic soda are produced by putting direct current electricity through a sodium chloride salt solution in a process called electrolysis.
What is the purpose of bleaching?
Bleach converts soils into colorless, soluble particles which are easily removed by detergents, then carried away in the wash water. Bleach can also brighten and whiten fabrics and help remove stubborn stains.
What types of bleach are there?
Is bleach an oxidizing or reducing agent?
While most bleaches are oxidizing agents (chemicals that can remove electrons from other molecules), some are reducing agents (that donate electrons). Chlorine, a powerful oxidizer, is the active agent in many household bleaches.
What is bleaching of leaf?
The extraction or the removal of chlorophyll from a leaf is called bleaching of the leaf.
Why is bleach called bleach?
As Tite Kubo revealed in interviews, Bleach was inspired by traditional Japanese death gods, or shinigami, that wore black robes and collected souls. Rukia came to embody the aesthetic Tite Kubo wanted, and he named the entire series after it.
What kind of chemical is used to bleach silk?
The Chlorine based bleaching agents are bleaching powder, sodium hypochlorite and sodium chlorite which are generally not used since these agents tend to chlorinate the fibroin. In order to enhance the whiteness of a fabric treatment is carried out with an optical brightening agent.
What are the steps in the production of silk?
Stage by Stage Silk Production. 1 Reeling. The method of unreeling the filament from the cocoon is reeling. The care and ability within the reeling operation prevents defects within 2 Throwing. 3 Spinning. 4 Degumming. 5 Bleaching.
How is bleaching carried out in the textile industry?
Bleaching can be carried out at various stages of conversion of fiber to garment i.e. from fiber, yarn, hank, woven, knit, towel, sewn up garments, etc. on various types of machines by simple hand processing to sophisticated bleaching ranges and by different application processes from exhaust to continuous.
How is the cultivation of silk called sericulture?
The cultivation of silk is known as Sericulture. The natural silk spun by silk worms in the form of cocoons is utilized only to 50% of its production because of lack in right way of processing and deficiency in sericulture. Silk is broadly divided as: a) Domestic silk or Mulberry silk b) Wild silk.