Injection Molding Cooling Time Calculator

Calculate cooling time using the flat-plate analytical solution: t = (s²/(π²·α)) × ln(8(Tm−Tw)/(π²(Te−Tw))). Determines total cycle time and production rate.

Inputs

Max wall thickness (mm)

Melt temperature, Tm (°C)

Mold temperature, Tw (°C)

Ejection temperature, Te (°C)

Thermal conductivity k (W/m·K)

Density (kg/m³)

Specific heat Cp (J/kg·K)

Injection + packing time (s)

Mold open/close time (s)

Tab to move between fields

Results

Cooling time (s)

9.75

Total cycle time (s)

17.75

Parts per hour (1 cavity)202.9

Thermal diffusivity (mm²/s)0.11

Temperature ratio argument3.08

Fourier number at ejection0.11

Melt-mold temp diff (°C)190

How to Use This Calculator

Enter Max wall thickness (mm), Melt temperature, Tm (°C), and Mold temperature, Tw (°C).
Set Ejection temperature, Te (°C), Thermal conductivity k (W/m·K), and Density (kg/m³).
Adjust Specific heat Cp (J/kg·K), Injection + packing time (s) as needed.
Review Cooling time (s) and Total cycle time (s).
Use Parts per hour (1 cavity) and Thermal diffusivity (mm²/s) to inform your decision.

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