A PET bottle compressor that supplies blowing air is, in effect, touching every bottle your plant produces. If that air carries oil, the defect rides straight to the shelf. This article explains why "oil-free" is the only safe choice for PET and how CMN's water-lubricated design delivers it without compromise.
In stretch-blow molding, compressed air expands the preform against the mold. The air contacts the inner bottle surface directly.
Oil aerosols leave a film that foggers and inspectors can miss.
Oil vapor can migrate into the product after filling.
Even trace oil undermines taste, odor, and brand trust.
A PET bottle compressor must therefore meet the highest air-purity class. CMN's units are verified to ISO 8573-1:2010 Class 0 — zero oil by the standard's definition.
CMN's single-screw PET bottle compressor uses water, not oil, inside the compression chamber:
No oil film means no oil can enter the air path.
Near-isothermal compression (~40–50°C) keeps the air stable and cool.
The single-screw balances forces, lowering bearing load and extending life.
Claim | Risk |
Oil-lubricated + filter | Filter bypass or saturation leaks oil |
Dry oil-free (hot) | Coated rotors wear, costly rebuilds |
Water-lubricated Class 0 | No oil in circuit, certified purity |
Only the last removes oil from the machine entirely rather than filtering it out after the fact.
For PET duty, CMN offers medium-pressure water-lubricated models including CM75G, CM110G, and PMVSD versions CM75GPV, CM110GPV, CM130GPV, CM150GPV, CM200GPV, CM242GPV, and CM320GPV. Buyers can scale from a single line to a multi-line plant.
A PET bottle compressor should make oil contamination impossible by design, not by filtration. CMN's water-lubricated single-screw compressors deliver certified Class 0 air up to 40 bar, protecting bottle quality at every cycle.
CTA: Contact CMN to review your PET air purity needs, or send your line specifications to request a quote.
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