Injection Molding Industry Applications

Precision hydraulic systems on high-speed molding machines require strict NAS 5 to NAS 7 oil cleanliness.

In the Indian plastic injection moulding industry, oil filtration focuses heavily on protecting precision hydraulic systems.

Modern injection moulding plants operate high-speed, automated machinery (such as Haitian, Ferromatik Milacron, Windsor and Toshiba/ISGEC machines and many more manufacturers).

Because these machines use high-precision proportional and servo valves to regulate clamping forces, mold movements and injection speeds, keeping hydraulic oil (typically HLP 46 or HLP 68) at a strict NAS 5 to NAS 7 cleanliness level is mandatory to prevent machine jamming, irregular shot weights, and component scuffing.

The primary lube and hydraulic oil filtration applications in injection moulding include:

1. Servo and Proportional Valve Protection

Preventing Valve Spool Jamming: High-precision valves have clearances of less than 1 to 3 microns. Microscopic particles suspended in the oil can lodge inside these clearances, causing the valve to stick or scratch, which leads to erratic machine movements or a complete shutdown.
Proactive Varnish Removal: Continuous operational pressure and localized thermal hotspots inside hydraulic loops degrade the oil over time, creating a sticky, resinous substance called varnish. Varnish coats the valve spools, trapping fine dirt and causing solenoid failures or delayed response times.

2. Moisture and Condensation Extraction

Heat Exchanger Leaks: Injection moulding machines run continuous water-cooling lines to their hydraulic oil reservoirs to maintain steady operating temperatures. Pinholes or loose fittings in internal oil coolers can cause water to seep directly into the oil.
Controlling Cavitation: Free and dissolved water drops the oil's load-bearing film strength, prompting pump cavitation, rapid seal degradation, and chemical oil shearing. Offline purifiers continuously pull-out moisture down to safe limits (typically under 100 ppm).

3. Machine Longevity & Centralized Oil Reclamation

Extending Hydraulic Oil Life: Completely changing out a 1,000+ litre hydraulic tank on a large-tonnage machine is highly expensive. Dedicated offline filtration systems clean the oil while the machine stays up and running, allowing factories to multiply their oil drain intervals by 3 to 4 times.
Flushing Post-Maintenance: When new pumps or cylinders are installed, filtration rigs are hooked up to flush out manufacturing debris, pipe scale and ambient plant dust before the machinery is cycled back into active production.

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