// multi-utility computation suite · offline · instant · precise
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sci.injection-moulding-fill-pressure Calculator
Calculates injection moulding fill pressure from cavity geometry, polymer viscosity, injection speed, and wall thickness using the Hele-Shaw flow model. Fill pressure scales as L²/(h³) — thin, long parts require high injection pressure; wall thickness is the most influential dimension.
Inputs
L Mm
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
H Mm
Perpendicular measurement through the material. For insulation: thicker is better. For beams: directly affects bending resistance.
Eta Pas
Fluid resistance to flow. Water at 20°C: ~1 cP. Honey: 2,000–10,000 cP. Higher viscosity increases pumping power requirements.
V Inj Mm S
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
W Mm
Horizontal extent perpendicular to the length.
Results
fill pressure P (MPa)
Reference formula or conversion factor shown for context.
fill time t (s)
The computed duration or time value.
volumetric flow rate Q (cm³/s)
Flow rate Q — the volume of fluid passing a point per unit time.
shear rate at wall γ̇ (s⁻¹)
The value at the specified point or condition.
P = 12ηLv / h²
Reference formula or conversion factor shown for context.