How to overcome problem of whiteness variation?
A. Cotton fibre contains natural coloring matter. These colouring matters get destroyed during bleaching process. Mainly oxidizing chemicals are used to remove these natural colouring matter. Now-a-days hydrogen peroxide based bleaching agent is used. If proper pH, temperature and time are not maintained it results in variation in whiteness and and also results in poor whiteness. To overcome these problems peroxide stabilizers or peroxide regulators are introduced. Peroxide regulator regulates the decomposition of peroxide, slowly releases the nascent oxygen and make it available for destroying natural colouring matter. For processing, if hard water is used, which contains metal ion impurities and heavy earth metals, causes faster decomposition of peroxide and ultimately results in poor whiteness. To overcome this problem sequestering agents, which work under higher alkaline condition must be incorporated in processing. (Please visit speciality chemicals page for detailed information a
