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Powdered solids are heterogeneous because they are composed of individual particles of widely differing sizes, shape and air spaces.
Powdered solids are heterogeneous because they are composed of individual particles of widely differing sizes, shape and air spaces.
So it is virtually impossible to characterize these complex systems
fully in terms of
fundamental properties at two levels namely those associated with an
individual particles and those of bulk powder are of interest.
Compaction is the situation in which the materials are subjected to
some level of mechanical
forces.
The effects of these forces are particularly important in the
manufacture of tablets and granules, in the filling of hard shell gelatin
capsules, in the powder handling.
Some Basic Definitions
Compaction
it is defined as ‘compression, consolidation ’of a
two- phase (particulate solid- gas)
system due to the applied force .
COMPRESSION :
A reduction in the bulk volume of the material as a
result of displacement of the gaseous phase.
CONSOLIDATION:
CONSOLIDATION:
Increase
in the mechanical strength of the material resulting from particle-particle
interactions.
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