Plastics Engineering

Injection Molding Cavity Fill Time Estimator Calculator

Estimate the time required for polymer melt to completely fill a mold cavity under given injection velocity, cavity geometry, and melt viscosity.

Runnable This tool can run, but independent engineering verification has not been established.

Quick Answer

Calculate Injection Molding Cavity Fill Time Estimator

Calculator

Cavity Fill Time (s)
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Result Interpretation

Injection Molding Cavity Fill Time Estimator Calculator computes Cavity Fill Time in s using the defined engineering formula and the input values provided. Cavity Fill Time is expressed in s. No universal acceptance threshold is defined by this calculator.

Worked Example

Verified calculation

Given:

  • Melt Viscosity = 150
  • Runner Length = 0.08
  • Cavity Volume = 8.0E-6
  • Runner Radius = 0.0008
  • Pressure Drop = 12000000

Expected Result:

  • Cavity Fill Time = 49.735919716217

Engineering Interpretation:

Under the given input conditions, the calculated result is: Cavity Fill Time = 49.735919716217 s.

The actual numerical result is computed by the Runtime engine using the persisted tool definition. The values shown here come from deterministically validated test cases.

Formula / Method

cavity fill time = (8.0 * melt viscosity * runner length * cavity volume) / (3.14159265358979 * pow(runner radius, 4) * pressure drop)

Formula family: formula_plastics_injection_molding_cavity_fill_time_estimator_calculator

Variables

SymbolLabelRoleDescription
eta Melt Viscosity INPUT Melt Viscosity
L Runner Length INPUT Runner Length
V Cavity Volume INPUT Cavity Volume
r Runner Radius INPUT Runner Radius
delta_P Pressure Drop INPUT Pressure Drop
fill_time Cavity Fill Time OUTPUT Cavity Fill Time

Calculation Steps

  1. Enter the melt viscosity in Pa·s.
  2. Enter the runner length in m.
  3. Enter the cavity volume in m³.
  4. Enter the runner radius in m.
  5. Enter the pressure drop in Pa.
  6. Step 1: Compute cavity fill time.
  7. Read the cavity fill time (s) from the results.

Engineering Summary

Calculate Injection Molding Cavity Fill Time Estimator

Frequently Asked Questions

What does this calculator calculate?

The Injection Molding Cavity Fill Time Estimator Calculator estimates Cavity Fill Time based on the input parameters you provide

Why is melt viscosity important in this calculation?

melt viscosity is directly proportional to cavity fill time. When you enter melt viscosity in Pa·s, the calculator uses it in the engineering formula to compute the output

How should I interpret the result cavity fill time?

The calculator outputs cavity fill time in s. The result is computed directly from the input values using the defined engineering formula

What units should I use for the inputs?

Enter each value in the units shown next to the input field: Melt Viscosity (Pa·s), Runner Length (m), Cavity Volume (m³), Runner Radius (m), Pressure Drop (Pa). Make sure all inputs use the specified units for consistent results

What assumptions does this calculator use?

This calculator uses automatically validated engineering formulas. Results are approximate and should be validated against site-specific conditions, applicable codes, and professional engineering judgment

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