(Midterms) Manuf Quiz 1 Pt.1 Flashcards
Mixer should produce a complete blend rapidly to avoid
product damage
Should be cleaned and discharge easily, dust-tight and
low maintenance and power consumption
Mechanical Mixing
Another method of mixing powders
Time consuming
Tumbling
Crushing powders to reduce particle size
Pulverization
Addition of substance that is equal to the amount in
the equipment
Geometric Dilution
Most accurate powder analysis
Powder Rheology
Quantity of water present in the powder
Moisture Content
Larger than surface area determined by air
permeability
Surface Area Determination by BET
Size of the powder
Particle Size
Influences the physicochemical properties of a powder
Particle Shape and Morphology
Dependent on the force generated by secondary flows
such as stokes drag force along with inertial lift force.
The equilibrium position formed by the two forces will
determine the positions of the particles being separated.
Ex: impactor and analytical sieving
Quantitative Separation by Inertial Methods
Commonly used technique
Ex: static and dynamic laser-light scattering
Diffraction of Laser Light
Used for both size distribution and morphology of particles
Ex: optical microscopy and scanning electron microscopy
Imaging
Suitable for blending dry powder material of
pharmaceutical, chemical, and food industries
The rotation of the barrel
causes the mass to tumble down upon
itself causing friction and thereby
abrading the parts in the mass
Tumbler Machine
Widely used for the manufacture of dry powder, talcum
powder, granules, spice and low-viscosity paste and liquid in
chemicals, pharmaceuticals, food and cosmetics industries.
Mixes free-flowing raw
materials within a U-shaped trough. A
horizontal agitator consisting of precisely
pitched inner and outer helical ribbons
moves materials in a well-balanced axial
and radial flow pattern.
Ribbon Blender
Particle size analysis utilizing a microtrac model S3500
laser diffraction: Ranging from
0.24 - 2800 microns
(practical limits for most industrial powders
are from
0.06 - 200 microns
Model X100 laser diffraction: Particle size analysis
measuring capabilities ranging from
0.10 - 700 microns
Moisture content should be?
less than 4%
Percentage Fines should not be
more than 15%
Angle of Repose
- Less than 25 =
- Greater than 40 =
- Less than 25 = Excellent
- Greater than 40 = Poor
Compressibility Index give percentage of each:
Excellent Flow
Very Good Flow
Good Flow
Passable Flow
Poor Flow
Very Poor Flow
✔ 5-15% = Excellent Flow
✔ 12-16% = Very Good Flow
✔ 18-21% = Good Flow
✔ 23-25% = Passable Flow
✔ 33-38% = Poor Flow
✔ >40% = Very Poor Flow
