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Designed specifically for PET bottle blow molding, this 40-bar, 5 m³/min oil-free screw compressor utilizes water as the lubricating, sealing, and cooling agent, unlike oil-lubricated units. It delivers 100% oil-free air at 4.0 MPa with a steady 5 m³/min flow. The two-stage screw system compresses air in two steps: first to an intermediate level, then to the final 40 bar, ensuring a smooth, pulse-free high-pressure supply that meets the stringent demands of modern PET production.
1. 100% Oil‑Free – ISO 8573‑1 Class 0 Certified
The compression chamber uses water as the sole medium for sealing and cooling, eliminating any oil contamination risk. Output air meets the strictest purity standards (ISO 8573‑1 Class 0), with oil content below 0.01 mg/m³. This makes it an ideal choice for food‑grade PET preform production, beverage filling lines, and pharmaceutical environments.
2. Steady 40 Bar High‑Pressure Output
The unit maintains a stable 40 bar discharge with minimal fluctuation, ensuring consistent preform expansion and uniform wall thickness. It supplies high‑pressure air directly to blow molding equipment, removing the need for an additional booster.
3. Significant Energy Savings
By using water injection for near‑isothermal compression, this system consumes 15–25% less energy than single‑stage alternatives, while delivering up to 20% greater airflow at the same motor rating. With PM VFD technology, partial‑load energy use is reduced by another 15–25%.
4. Cooler Running – Longer Life
Water’s superior heat absorption keeps operating temperatures lower than oil‑based designs, boosting equipment reliability and extending service life.
5. Minimal Maintenance Requirements
No oil filters, separators, or oil changes — and zero waste oil disposal. Service tasks are limited to periodic water filter replacements and standard inspections. The absence of carbon or sludge deposits prolongs air end life, and consumables are few and easy to replace.
6. Quiet, Low‑Vibration Performance
Water effectively dampens noise and vibration, making the unit noticeably quieter than dry‑running or piston compressors. Smooth, pulse‑free airflow improves the working environment and reduces wear on downstream components.
7. Designed for Continuous 24/7 Operation
Built for non‑stop duty with food‑grade stainless steel and premium bearings. The automatic water exchange function permits maintenance without interrupting production.
8. Intelligent Controls & Remote Access
A PLC with HMI touchscreen enables full digital automation. Cloud‑based monitoring and predictive diagnostics minimize unplanned downtime, while IoT connectivity supports seamless Industry 4.0 integration.
| Comparison: Water-Lubricated Screw vs. Piston Compressors | ||
| Feature | Water-Lubricated Screw | Oil-Free Piston |
| Air Quality | 100% oil-free, ISO Class 0 | Oil-free (cylinder), oil in crankcase |
| Compression Method | 2-stage screw | 3–4 stage piston |
| Lubricating Medium | Pure water | None (crankcase has oil) |
| Energy Efficiency | 10–35% less energy | Higher energy consumption |
| Energy Savings | 25–35% vs. piston machines | Baseline (less efficient) |
| Noise Level | Low – water absorbs vibration | High – reciprocating impact |
| Vibration | Minimal – smooth rotary motion | High – reciprocating motion |
| Operating Temperature | Low – water cooling | High – hot air discharge |
| Maintenance | Low – no oil system parts | High – valves, piston rings, oil changes |
| Cooling System | Single cooler for lubricating water- | Multiple interstage coolers |
| Consumables | Water filters (<$500/year) | Oil, filters, piston rings, valves |
| Continuous Operation | 24/7 | Limited by heat and wear |
Primary Application: PET Bottle Blowing
Blow molding of PET bottles typically operates at pressures ranging from 20 to 40 bar. This compressor has been purpose‑built to supply that requirement, delivering oil‑free, high‑pressure air that is vital for forming bottles. It guarantees uniform preform inflation and eliminates the risk of oil contamination, which could otherwise lead to surface defects and product rejection.
Other Key Applications:
Food & Beverage Processing – For direct product contact, where absolutely oil‑free air is mandatory.
Pharmaceutical Production – Used in fermentation, tablet coating, and packaging processes.
Electronics & Semiconductor Manufacturing – Provides contaminant‑free air for cleanroom operations.
Medical Sector – Supplies oil‑free high‑pressure air for various healthcare applications.
High‑Pressure Nitrogen Boosting – Works in conjunction with nitrogen generators to raise gas pressure.
Laboratory and Research Facilities – Offers a quiet, stable, oil‑free source of high‑pressure air for experiments and testing.
Q1: How does it work?
Water replaces oil for lubrication, sealing, and cooling. Compressed air and water are fully separated — delivering 100% oil‑free air.
Q2: Is 40 bar pressure stable for continuous operation?
Yes. Pressure fluctuation stays within ±0.5 bar under 24/7 operation thanks to the intelligent constant‑pressure control system.
Q3: Can you customize voltage for different countries?
Absolutely. We support 110V/220V/380V/415V and various frequency/electrical standards to ensure local compatibility.
Q4: Advantages over traditional oil‑free compressors?
Lower noise, lower energy consumption, near‑zero maintenance. No filter element replacement or oil pollution issues — longer life and better cost‑performance.
Q5: How does water quality affect maintenance?
Use treated or deionized water. The built‑in water filter keeps quality stable. Maintenance costs drop to about 1/5 of oil‑lubricated units — just water and air filter changes.
Q6: Main applications?
PET bottle blowing, food & beverage, pharmaceutical, electronics, and other high‑purity industries where oil contamination is unacceptable.
