Food packaging is an important link in the product production process, especially cooked food, dairy products, beverages and ready-to-eat foods, which may be in direct contact with ambient air during the packaging process. If particulate matter, microorganisms or other pollutants in the air are not properly controlled, product hygiene and shelf life may be affected. Therefore, it is necessary to establish a stable and clean packaging environment through measures such as air filtration, air flow organization, temperature and humidity, and personnel management.
1. Why does the food packaging workshop need a clean environment?
After food is processed, it is often in a relatively open state during the packaging process. Personnel movement, packaging materials, equipment operations, and outside air can all be sources of contamination.
By properly controlling the air cleanliness in the packaging area, the risk of air particles and contaminants entering the product can be reduced. For food packaging areas with high hygiene requirements, the air purification level should be further improved based on product type and process characteristics.
2. Food packaging workshop air purification system
Typical air treatment systems can use:
Fresh air → Primary effect filtration → Medium effect/bag filter → Air conditioning treatment → HEPA high efficiency filtration (on demand) → Clean air supply → Packaging area → Return air/exhaust air
Primary-efficiency filters mainly intercept larger dust and fibers, and medium-efficiency or bag filters further reduce the particle load. For packaging areas where food is directly exposed and requires higher air cleanliness, HEPA high-efficiency filters can be configured according to actual needs.
Through multi-stage filtration, the load of the back-end high-efficiency filter can be reduced and the stability of the entire air treatment system can be improved.
3. Reasonable control of airflow in the packaging area
A clean packaging environment requires not only high-efficiency filters, but also reasonable airflow organization.
Clean air should flow from relatively clean areas to areas with higher contamination risks to prevent external air from directly entering food exposure areas. The locations of the air supply and return vents need to be designed in conjunction with the production line, equipment and personnel activity areas.
For packaging stations with high local cleanliness requirements, FFU or local clean air supply equipment can be used to form a relatively independent clean area, reducing the energy consumption caused by comprehensively improving the cleanliness level of the entire workshop.
IV. Pressure control in the packaging workshop
A reasonable pressure gradient should be established between areas with different hygiene levels based on the food production process.
For example, the clean packaging area where food is directly exposed can maintain a relatively high pressure according to actual design requirements, allowing air to flow from the clean area to the general production area, thereby reducing the entry of external polluted air.
Pressure control needs to be linked to the supply air volume, return air volume and exhaust air volume, and continuously monitored through a pressure difference sensor.
5. Temperature and humidity control is equally important
The temperature and humidity in the food packaging workshop not only affects personnel comfort, but may also affect food quality, packaging materials and equipment operation.
High humidity may make condensation and microbial control more difficult, while low humidity may cause static electricity problems. Therefore, a reasonable temperature and humidity range should be determined based on food type, packaging materials and production processes.
The air conditioning system should have stable cooling, heating and dehumidification capabilities, and automatically adjust according to the actual load.
6. Filter selection for food packaging areas
It is recommended to focus on the following when selecting filters:
Filtration efficiency: determined according to cleanliness level and product requirements;
Rated air volume: meets the design air volume of the packaging area;
Initial resistance: affects system operation energy consumption;
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Moisture resistance: adapted to the actual environment of the food workshop;
Sealing performance: reducing bypass leakage;
Dimensions and specifications: matched with AHU, FFU and air supply outlet.
Dust holding capacity: related to the service life of the filter;
For packaging areas with higher air cleanliness requirements, HEPA filters can be used as terminal filtration equipment.
7. How to reduce the operating costs of clean packaging environment?
Food packaging workshops do not necessarily require the entire plant to adopt the highest level of cleanliness. Zone control can be carried out according to the production process.
In areas where food is directly exposed, the filtration and air supply levels are improved, while basic air filtration is used in common auxiliary areas, which can meet sanitary requirements while reducing HVAC system operating energy consumption.
At the same time, the actual operating status should be judged by monitoring the filter pressure difference to avoid continuous increase in fan energy consumption caused by filter clogging.
8. Jiangsu Yueboyang Food Clean Environment Product Supporting Capabilities
Jiangsu Yueboyang Purification Equipment Co., Ltd. focuses on the field of clean air and purification equipment, and can provide products such as primary, medium, high-efficiency and ultra-high-efficiency filters, bag filters, FFU fan filter units and high-efficiency air supply outlets.
For food processing and packaging workshops, the company can select and customize products based on cleanliness level, design air volume, production process, installation size and actual use environment, and provide supporting support for air filtration, clean air supply and related purification products for the food packaging area.
9. Summary
Clean environment control in food packaging workshops is a comprehensive project that requires the combination of air filtration, clean air supply, air flow organization, pressure control, temperature and humidity adjustment and hygiene management.
Through zoning control and reasonable configuration of primary, medium and HEPA filters, the risk of air pollution in the food packaging process can be reduced, while taking into account the cleaning effect, system stability and operating costs, establishing a more reliable clean packaging environment for food production enterprises.
