Abstract:
A convective type nutmeg mace dryer was developed and its performance was evaluated.
The major parts of the developed dryer are Drying chamber, Plenum chamber, Heating coil box,
Air flow control and Blower with power source. The dryer was evaluated at three different air
temperatures of 40 o C, 45 o C and 50 o C and at three air velocities 1.6 m/s, 2.0 m/s and 2.4 m/s.
Unblanched samples dried at drying air temperature of 45 o C and with air velocity of 2.4 m/s
produced better quality dried mace in terms of volatile oil content, myristicin content, oleoresin
content and color. Also at this treatment combination the drying time was lower and the energy
consumption minimum. It was also found that the quality of the dried samples in the developed
dryer is superior to conventional sun drying method.
It was also established from the studies
that blanching pretreatment prior to drying by dipping in hot water at 75 o C for 2 min further
increased the quality of dried mace.
The convective type nutmeg mace drier is simple in
construction, efficient in operation and produces better quality mace.
