in this paper the raw materialswere chemically characterized before pelletization under different
conditions in a semi-industrial pellet mill. In addition, the physical and mechanical parameters of the pellets
produced were analyzed in order to determine the optimum pelletization conditions for each raw material by
using IBM SPSS Statistics 20 software and considering the European requirements for non-industrial pellets.
The aim of this work is to investigate the influence of the main densification parameters (moisture content,
compression and temperature) and rawmaterial (leaves, pruning, and wood) on the quality properties of pellets
from the different olive tree pruning residues.
In general, low moisture content (9%), short compression lengths (20–24 mm) and temperatures higher than
40 °C were the best pelleting conditions for the residual biomass from olive trees, although these parameters
varied between the raw materials analyzed.