Deinking - Deinking Process - Bleaching


If white paper is desired, bleaching uses peroxides or hydrosulfites to increase the brightness of the pulp. The bleaching methods are similar for mechanical pulp, but the goal is to make the fiber brighter.

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Other articles related to "bleaching":

Blanqueador - History
... The earliest form of bleaching involved spreading fabrics and cloth out in a bleachfield to be whitened by the action of the sun and water ... then solid calcium hypochlorite (bleaching powder) Louis Jacques Thénard first produced hydrogen peroxide in 1818 by reacting barium peroxide with nitric acid ... Hydrogen peroxide was first used for bleaching in 1882, but did not become commercially important until after 1930 ...
Blanqueador - Classes of Bleaches - Reducing Bleaches
... is one of the most important reductive bleaching agents ... dyeing processes to eliminate excess dye, residual oxide, and unintended pigments and for bleaching wood pulp ... + 2 CH2O + H2O → NaHOCH2SO3 + NaHOCH2SO2 which is used in bleaching wood pulp, cotton, wool, leather and clay ...
Bleaching Of Wood Pulp - Bleaching Chemical Pulps - Hydrogen Peroxide
... Hydrogen peroxide is sometimes used with oxygen in the same bleaching stage and this is give the letter designation Op in bleaching sequences ... peroxide, so some improvement in the efficiency of peroxide bleaching can be achieved if the metal levels are controlled ...
... The bleaching process has been known for thousands of years, but the chemicals currently used for bleaching resulted from the work of several 18th century scientists ... just call it "bleach", and calcium hypochlorite (bleaching powder) ... Oxidizing bleaching agents that do not contain chlorine most often are based on peroxides, such as hydrogen peroxide, sodium percarbonate and sodium ...

Famous quotes containing the word bleaching:

    Worn down by the hoofs of millions of half-wild Texas cattle driven along it to the railheads in Kansas, the trail was a bare, brown, dusty strip hundreds of miles long, lined with the bleaching bones of longhorns and cow ponies. Here and there a broken-down chuck wagon or a small mound marking the grave of some cowhand buried by his partners “on the lone prairie” gave evidence to the hardships of the journey.
    —For the State of Kansas, U.S. public relief program (1935-1943)