Accordingly, two additive contents were
utilized (1 and 2 wt.%). First, 1 wt.% of lignosulfonate was added. Moisture
content of thematerial at the inlet was fixed at 15wt.% to compare
with poplar pellets without additive. Again if the pellet tested in the
laboratory after each test did not fulfill the ENplus category, a higher
compression die or additive content were tested.”