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250 kW 40 Bar Oil-Free Water-Injected Screw Compressor for PET Bottle Blowing
Class 0 oil-free air. Stable 40 bar at the blow valve. No oil to buy, change or dispose of.
| 40 bar working pressure | 250 kW motor | [FILL: 20m³/min] free air delivery | ISO 8573-1 Class 0 |
This oil‑free rotary screw compressor operates with water‑based lubrication and is driven by a permanent‑magnet variable‑speed motor. In place of conventional oil, the system circulates purified water or a water‑based fluid, which ensures that the discharged air contains zero oil contamination. Such clean output makes the unit perfect for industries that demand exceptionally pure air quality.
Why PET blowing punishes the wrong compressor？
Three failures cost PET plants real money, and all three trace back to compressed air.
Oil that reaches the bottle. Even a trace of oil mist leaves haze and spots on the preform and the finished bottle. It shows up in rejects, in customer complaints, and in a failed food-safety audit. A machine that is "oil-free on the brochure" but carries oil vapour downstream is not oil-free where it matters — at the blow valve.
Pressure that sags during the blow. Stretch blow moulding is a batch process: every cycle pulls a large volume of 40 bar air in under a second. If pressure drops at that moment, wall thickness varies, and bottles burst on the line or fail the top-load test. The compressor has to hold pressure through the cycle, not just on average.
Energy that runs all shift. 40 bar air is the most expensive utility in a bottle plant. Two machines with the same price tag can differ by six figures over their service life. The number that matters is specific power at your working pressure — not the kW printed on the motor.
Primary Use Cases
PET Container Blow‑Moulding – Delivers clean, high‑pressure air essential for shaping bottles.
Food & Beverage Sector – Guarantees fully oil‑free air that comes into direct contact with products.
Pharmaceutical Manufacturing – Supplies purified air for fermentation, tablet coating, and packaging lines.
Electronics & Semiconductor Fabrication – Provides contaminant‑free air for cleanroom environments.
High‑Pressure Nitrogen Boosting – Partners with nitrogen generators for laser cutting and electronic assembly.
Research & Analytical Laboratories – Offers quiet, stable, and oil‑free high‑pressure air for experiments and instruments.
