Based on
previous findings by the author and other researchers [43,44] that a
hold time under compression in the mold in excess of 40 s has little
effect on briquette characteristics, the compacted briquettes were held
at the desired compaction pressure of 19 and 31 MPa, for 60 s, and
then extruded from the mold through the hole shown on the right
side of the mold base plate in Fig. 1.