Coconut residue was ground with a disc mill and the sample was separated into different particle size fractions
using a set of screens. The set of standard screens (200–2000 lm) was arranged serially in a stack with smallest mesh screen at bottom and the largest at the top. The sample was placed on the top screen and the stack was shaken mechanically for 20 min. The particles retained on each screen were removed and weighed, and the mass of the individual screen increments were converted to mass fractions of the total sample and their volume surface mean diameter was
calculated for feed as well as ground sample as shown in Table 1.