Unbleached chemical pulps, which in most cases are kraft pulps, have a dark brown colour,
which is a result of the chromophores in the pulp, and these are mainly found in the residual
lignin. However, several paper products like printing and writing paper, food board etc require a
bright pulp as the requirements on a good printing paper surface and other related properties are
high. Good printing properties mean that a high brightness and a high cleanliness are needed
and in the latter case this means a low amount of shives and dirt.
Unbleached chemical pulps, which in most cases are kraft pulps, have a dark brown colour,which is a result of the chromophores in the pulp, and these are mainly found in the residuallignin. However, several paper products like printing and writing paper, food board etc require abright pulp as the requirements on a good printing paper surface and other related properties arehigh. Good printing properties mean that a high brightness and a high cleanliness are neededand in the latter case this means a low amount of shives and dirt.
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