Tablet Compression Dwell Time Calculator
Calculate the dwell time during tablet compression process - the duration for which punch head flat remains under main compression rollers
Formula
dt = (Dhf × 60 × 1000) / (Dpc × π × rpm)
dt = dwell time (ms)
Dhf = punch head flat diameter (mm)
Dpc = turret pitch circle diameter (mm)
rpm = turret speed
Input Parameters
mm
mm
rpm
Calculated Dwell Time
0.00 ms
milliseconds
Calculation Steps
Example Calculation
Given values:
- Punch head flat diameter (Dhf) = 12 mm
- Pitch circle diameter (Dpc) = 250 mm
- Turret speed (rpm) = 50
Calculation:
dt = (12 × 60 × 1000) / (250 × 3.14159 × 50)
dt = 720,000 / 39,269.5
dt = 18.34 ms
What is Dwell Time?
The duration of time spent by the punch head flat under the main compression rollers during tablet compression. It's the time for which maximum compression force is applied over powder or granules.
Importance
- • Affects tablet hardness and strength
- • Prevents capping and lamination
- • Helps in batch scale-up comparison
- • Ensures complete air removal
Factors Affecting Dwell Time
Punch Head Flat
Larger diameter increases dwell time
Turret Speed
Higher RPM decreases dwell time
Pitch Circle Diameter
Larger PCD decreases dwell time
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