The food industry demands exceptionally high standards for compressed air purity.
This is particularly critical for air supplies that come into direct contact with the production process; if moisture or oil content exceeds limits, it can lead to product contamination, regulatory compliance risks, and even crises regarding brand reputation.
Today, I would like to share a case study from our own experience.
We hope this serves as a useful reference for industry peers or factories facing similar challenges.
Client Background:
A food processing enterprise in East China operating two automated packaging lines.
The client reported frequent instances of condensation forming on the inner walls of the final packaging bags. Initially, they suspected an issue with the packaging materials, but after multiple rounds of troubleshooting, they discovered the root cause lay in the compressed air system. "Our compressed air seems fine, but we just can't seem to solve the issue of excessive moisture."
- Customer's Equipment Supervisor
Problem Analysis:
The original on-site setup consisted of:
Refrigerated dryer + two-stage filtration
Operating dew point: approx. 5°C
Complex distribution of air consumption points, with some located far from the main compressor unit
On-site inspection revealed several key issues:
The refrigerated dryer lacked sufficient capacity and performed inconsistently during hot, humid summer conditions.
Severe "condensate backflow" occurred at the ends of certain air supply branches.
Filters were undersized, causing high pressure drops, airflow resistance, and moisture carry-over into the air lines.
✅ Solution:
We redesigned the post-treatment configuration based on the customer's needs:
Added an adsorption dryer (dew point: -20°C) alongside the main unit.
Adjusted the filter combination to include a high-efficiency oil-water separator and a high-precision particulate filter.
Installed drain valves at critical air consumption points to eliminate the risk of condensate backflow.
Our team handled the entire installation and testing process to ensure stable operation.
Results of the Upgrade:
Condensation on the inner walls of product packaging was completely eliminated.
Overall equipment operation became more stable, and compressed air quality met all compliance standards.
Customer return rates dropped by over 90%, and the pass rate on the packaging line increased by 5%.
The customer remarked: "This is the most thorough equipment upgrade we've had in five years."
🧩 Summary & Recommendations:
Regarding compressed air systems:
Requirements for dryness vary significantly depending on operating conditions and industry.
Refrigerated dryers aren't a cure-all; if you have strict cleanliness requirements, an adsorption dryer combined with high-efficiency filters is the safer choice.
Proper equipment selection plus professional installation equals long-term, stable operation-saving you hidden costs that far exceed the value of the equipment itself.
Does your factory face similar issues?
Feel free to leave a comment with your industry and specific requirements, and we can provide a complimentary reference plan for your post-treatment equipment.