// Catalogue
4products
Filters
Sort Best selling
Similar products
// Buying guide
How Moulding Machine Hydraulics Work
A hydraulic injection moulding machine runs a repeating cycle. The clamp closes and locks the mould; the injection unit pushes molten plastic in at high pressure, then holding pressure packs the part while it cools. The screw recovers for the next shot, the clamp opens and ejectors push the part out. Core pulls and other mould movements add extra circuits. Fast machines often use accumulators to deliver high injection speed without a huge pump.
Each stage needs different pressure and flow, which is why the pump, valves and controls must work closely together.
Servo Pump Retrofits
Older machines often run a fixed speed motor and pump all cycle long, wasting energy whenever demand drops. A servo pump retrofit replaces that with a servo motor and drive that speeds up for injection and slows right down during cooling and holding. The result is lower power use, cooler oil and a quieter shop floor. Many moulders find the retrofit pays back through energy savings, especially on machines with long cooling times.
What Moulding Machines Need
- Hydraulic pumps: vane, piston or servo driven pumps matched to the machine.
- Proportional and servo valves: for injection speed and pressure profiles.
- Accumulators: for fast injection on high speed machines.
- Oil coolers: to hold oil temperature steady through long runs.
- Filtration: to protect valves and keep shot weights consistent.
Oil Temperature and Part Quality
Oil temperature affects viscosity, and viscosity affects how valves respond. When oil runs hot, injection speed and pressure can drift, and part weight and quality drift with them. Good cooling, a working thermostat and clean oil keep the process stable. Many quality complaints on moulding machines trace back to an oil cooler that’s fouled or undersized.
Extrusion and Auxiliary Equipment
Plastics plants run more than moulding machines. Extruders use hydraulics for screen changers and die adjustment. Chillers and mould temperature controllers need circulation pumps. Material conveying often uses vacuum pumps to move granules to the machines. Each of these can stop production if it fails, so it’s worth including them in your spares plan.
Related Manufacturing Sectors
Plastics manufacturing shares a lot with other manufacturing sectors. Automated cells and robots around the machines are covered under manufacturing & automation, gas supply for gas assist moulding under industrial gases, and general plant equipment under general industry.
What We Need From You
- Machine make, model and tonnage.
- Pump, valve or motor part numbers and nameplate photos.
- Cycle time and any recent changes in part quality.
- Oil type and running temperature.
Why Work With TSA Hydraulics Engineering
We supply moulding machine pumps, valves, cooling and servo retrofits, with engineers who understand how hydraulics affect part quality and energy bills. You get clear prices in AUD, honest advice on genuine versus equivalent parts, and technical consultation before you commit to a retrofit.