At a fixed temperature of hot-pressing, both the air-dry density and
the compressive strength increase with decrease in the size of the
smashed rice straw. For instance, at a fixed temperature of 130 °C, as
the size of the smashed rice straw decreases from 5–2mm(test B7) to
b2 mm (test B12), the air-dry density of the briquette increases from
0.89 to 0.99 g/cm3, and the compressive strength of the briquette
substantially increases from 33.3 to 65.4 kgf/cm2. Bergström et al.
presented that the particle size distribution had some effect on the
compression strength of the Scots pine sawdust fuel pellets [17].