Both in the case of conventional baled
storage (the BAGATEX—2U bales are an
exception) and wet bulk storage. the
unbleached chemical Pulp brightness
decreases on prolonged storage (more than
6 months). The darker pulp obtained
because of prolonged storage is, however.
as easy to bleach as unbleached chemical
pulp from fresher bagasse.
The situation is somewhat different if
RMP, TMP, CMP or CTMP (the so—called
“mechanical” bagasse pulpsl is to be
produced from bagasse that has been
stored for a considerable length of time.
To maintain the desired opacity. Peroxide
bleaching is required for these pulps.
However, the stored bagasse may darken to
the point where peroxide bleaching will
no longer brighten the "mechanical"
bagasse pulps to acceptable levels of
brightness.