Injection Moulding Technology
A plain-language guide to the injection moulding cycle - and what actually determines the machine you need.
How Injection Moulding Works: Six Steps
Every machine repeats this cycle thousands of times a day - speed and precision are what separate good machines from great ones.
Clamping
The two mould halves close and are held shut with force measured in tons.
Injection
The screw injects molten plastic into the mould cavity at high pressure.
Holding
Pressure is maintained as the material packs out every detail of the part.
Cooling
The part solidifies inside the water-cooled mould - usually the longest phase.
Screw Recovery
While the part cools, the screw melts and meters the next shot of material.
Ejection
The mould opens and ejector pins push the finished part out - cycle complete.
What Actually Determines the Machine
Four numbers decide which machine makes your part: clamp tonnage (from part area), shot weight (from part volume), tie-bar spacing (mould must fit between the bars) and cycle time (your output target). Get these right and the machine pays for itself; get them wrong and you fight scrap for years.
Send us the part drawing or a sample - we calculate all four and specify the machine, free.
Injection Unit
Screw, barrel and nozzle - sized by shot weight and material.
Clamp Unit
Toggle for speed and efficiency; hydraulic for heavy moulds.
Tooling
The mould defines the part - custom built to your drawings.
Controls
Precise temperature, pressure and speed control for repeatable parts.
Guides Written From Real Floors
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Have a Part You Want to Produce?
Send the drawing or sample - get tonnage calculation, machine specification and a free quote within 24 hours.