Abstract
Pulp fibers currently produced from the pulp and paper industry can be classified into three different kinds: chemical pulps, mechanical pulps, and deinked (recycled) pulps. The principle objective of bleaching any type of pulp is usually to increase the pulp brightness, which is defined as reflectance measured at a wavelength of 457 nm. However, the strategy and detailed processes are different for different pulps. This information is given in this article.
Keywords: Bleaching agents; Pulp; Paper; Chlorine; Chlorine dioxide; Hydrogen peroxide; Ozone; Oxygen; Hypochlorite; Mechanical pulp; Sodium hydrosulfite