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Injection Moulding (Shot & Cooling)

Two numbers drive a moulding cycle: the shot size (part + runners, which must fit the barrel) and the cooling time, which scales with the square of wall thickness and usually dominates the cycle.

Part volume (cm³)

Cavities

Runner allowance (%)

Melt density (g/cm³)

Wall thickness (mm)

Thermal diffusivity (×10⁻⁸ m²/s)

Melt temp (°C)

Mould temp (°C)

Eject temp (°C)

Shot volume

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Shot mass

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Cooling time

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Halving the wall quarters the cooling time — thinning thick sections is the single biggest cycle-time win. Diffusivity is ~1×10⁻⁷ m²/s for most thermoplastics.

A helper, not a substitute for engineering judgment. Verify against the governing standard.