Milk and Milk Products Technology

Comparison of physico-chemical properties of drum-dried and sprays dried milks

COMPARISON OF PYSICO-CHEMICAL PROPERTIES OF DRUM-DRIED AND SPRAYS DRIED MILKS

Properties	Drum-dried	Spray-dried
Particle size	8-20µM	10-20µM
Surface	Wrinkled	Normally smooth
Shape	Irregular;angular with rough edges	Regular; usually spherical
Air cell	Normally absent	Normally present
Bulk density (g/ml)	0.3-0.5	0.5-0.6
Flowability	Slightly lower	Slightly higher
Dustiness	-do-	-do-
Reconstitutability	Lower	Higher
Flavour	Definitely cooked	Same as pasteurized milk
Colour and appearance	Slightly darker	Same as milk