How do you increase the density of a powder?
Increasing feed solids generally increases bulk density. Feed aeration decreases bulk density. Feed suspensions give higher bulk densities than feed solutions. Increasing residual moisture content increases bulk density.
How do you find the density of a powder?
Tips. You can determine the particle density of the powder mixture by using the equation density = (mass/volume).
What is the density of powder?
The bulk density of a powder is the ratio of the mass of an untapped powder sample and its volume including the contribution of the interparticulate void volume. Hence, the bulk density depends on both the density of powder particles and the spatial arrangement of particles in the powder bed.
What are the factors that might affect the flow properties of a powder?
Factors Influencing Flow Properties of Powders
- Particle Size. Very fine particles possess attractive forces such as van der waals, electrostatics, surface tension etc.
- Surface Texture of The Particles.
- Moisture Content.
How do you calculate flow rate of powder?
The rates of flow of the powders are given by the expression where W is the flow rate in g min−1, Do is the orifice diameter in cm, ρ is the particle density in g cm−3, g is the gravitational constant, and A and n are numerical terms which depend on temperature and particle size.
Which is used as measure of flow property of powder?
Four commonly reported methods for testing powder flow are (1) angle of repose, (2) compressibility index or Hausner ratio, (3) flow rate through an orifice, and (4) shear cell. In addition, numerous variations of each of these basic methods are available.
Why flow properties of powder is important?
To achieve better manufacturing efficiency and product quality in powder processing industries, a predictable powder flow is of greater importance to avoid capacity shortfall and production interruption that involve costly loss of production time.
What are the properties of powder?
Powder properties
- Bulk and tap density.
- Flow properties testing.
- Odour and colour.
- Electrostatics.
- Compression properties.
- Compaction properties.
- Milling, grinding & granulation (chemical physical stability)
What are the types of powder?
Q: Types of Powder
- Types of powders.
- Loose powders.
- Pressed Powder. A pressed powder is ideal for a gal on the go or someone who wants a bit more precision and a wider shade range.
- Translucent Powder.
- Coloured Powders.
- Setting powder.
- Finishing powder.
- Color Correcting Powders.
How can properties of powder be improved?
Factors affecting the flow properties of powder Alteration of Surface Forces. Reduction of electrostatic charges can improve powder flowability. Electrostatic charges can be reduced by altering process conditions to reduce frictional contacts. Moisture content of particle greatly affects powder’s flowability.
What is a fine powder?
Fine Powder is a medieval term for a particular spice mixture. Some think Fine Powder might have been the same as “powder douce” (aka “sweet powder”), and that it definitely contained cinnamon, cloves, ginger and grains of paradise, as well as sugar. …
What is the state of powder?
For example, its molecules are tightly packed, there is little vibration among the molecules and the intermolecular forces are large. The only difference is that the particle as a whole is very small. Therefore,as a result, powder is considered as a solid since it is nothing but a pile of very small solid particles.
What is the difference between powder and granules?
As nouns the difference between powder and granule is that powder is the fine particles to which any dry substance is reduced by pounding, grinding, or triturating, or into which it falls by decay; dust while granule is a tiny grain, a small particle.
What are the advantages of granules over powder?
The major advantage of granules over powder is that the granules are free-flowing, it increases compressibility, content uniformity and it can be used for the preparation of tablets and can enclose in capsules.
How powders containing potent drugs are dispensed?
These substances can be dispensed by two methods Dispense as separate set of powders with directions that one of each kind shall be taken as a dose An equal amount of any of inert absorbent like magnesium carbonate, light magnesium oxide kaolin starch may be mixed with eutectic substance then blended together lightly …
What are powders in pharmaceutics?
What are pharmaceutical powders? A pharmaceutical powder is defined as a dry, solid substance, composed of finely divided drugs with or without excipients and intended for internal or external use. It is a solid substance in finely divided state typically obtained by crushing, grinding, or comminuting.