An expansion ratio of worldwide production level of such mechanical pulp as SGW, TMP, CTMP, PGW, etc. is becoming greater. It is for this reason that the technological improvement in high consistency bleaching by hydrogen peroxide has made it possible to achieve economically a 80% brightness for mechanical pulp, or a 85% brightness (ISO) depending on the type of wood, even though the cost chemicals are taken into consideration, in addition to the growing demand by reason of a shaft to thinner paper and tremendously progressed manufacturing process.
Some advantages of high consistency bleaching by hydrogen peroxide are as follows :
· Supply volume of hydrogen peroxide is decreased by 2550% to achieve a brightness of same level.
· A higher brightness is achievable by supplying a larger volume.
· A less COD can be expected to achieve same level brightness.
· A higher opacity of pulp is achievable.
· A higher production yield can be expected.
· A stabilized production process is available because the stained water cannot get into bleaching system.
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