Food Processing Cleanroom Standards (HACCP)
Strict management of production process facilities in food factories is crucial for ensuring food safety and hygiene, preventing food poisoning caused by pathogenic bacteria (e.g., E. coli, Salmonella), or mold contamination.
Adherence to the HACCP (Hazard Analysis and Critical Control Point) system establishes a food production certification system utilizing comprehensive hygiene management of the production process.
Operating Areas and Air Cleanliness Levels
| Operating Area | Cleanliness Level | Settling Bacteria | Settling Fungi | Operation Details |
|---|---|---|---|---|
| Clean Operating Area | Class 1,000 ~ 10,000 | ＜30 pc | ＜10 pc | Cooling, adjustment, sterile packaging, etc. |
| Semi-clean Area | Class 100,000 | ＜50 pc | - | Processing, heat treatment |
| Contaminated Area | Class 300,000 | ＜100 pc | - | Pre-processing, raw material storage, waste disposal |
A. Air Handling and Environmental Control Systems
1. Air Purification
- Clean Work Area: Equipped with HEPA filters, air exchange rate ≥15 times/hour, achieving ISO 7 or ISO 8.
- Critical Filling Points: Equipped with Class A (ISO 5) laminar flow hoods above the line.
- Other Areas: Utilize medium-efficiency or high-efficiency filters.
Objective: Control microorganisms and particulate matter suspended in the air. The air exchange rate is a key design parameter.
2. Temperature and Humidity Control
- Temperature: Set according to process requirements and personnel comfort, usually ≤25°C.
- Humidity: Critical control parameter, usually ≤55% RH (some processes require even lower humidity).
Objective: High humidity breeds mold. Proper control inhibits microbial growth, ensures product characteristics (e.g., preventing clumping), and improves comfort.
3. Pressure Gradient
- Core Principle: Air flows from High-Cleanliness → Low-Cleanliness → Non-Clean areas.
- Pressure Differential: A positive pressure of ≥5-10 Pa must be maintained between adjacent areas.
Objective: The clean work area must maintain the highest positive pressure to ensure unidirectional airflow and prevent backflow of contaminants.
4. Fresh Air and Exhaust Air
- Ample Fresh Air: Meeting personnel needs and maintaining positive pressure.
- Localized Exhaust: Installed in heat treatment areas, cleaning rooms, and restrooms.
Objective: Ensure good air quality and promptly eliminate sources of pollution (heat, humidity, odors).
B. Building Structure and Hygiene Design
This is of paramount importance in the food industry.
1. Surface Material ("Six-Sided Smoothness")
- Principle: Walls, ceilings, and floors must be smooth, non-toxic, non-absorbent, and easy to clean.
- Walls/Ceilings: Color-coated steel panels (magnesium oxide core preferred), stainless steel, or ceramic tiles.
- Floors: Epoxy resin self-leveling (seamless) or terrazzo. Must be non-slip with drainage slope (≥1.5%).
2. Prevention of Cross-Contamination
- Physical Separation: Strict wall separation between raw and cooked food areas.
- Flow Separation: Independent passages for personnel, materials, airflow, and waste.
- Drainage: No drainage from clean to dirty areas; must use water seals and backflow preventers.
3. Doors, Windows, and Details
- Materials: Mold-resistant, easy-to-clean (e.g., color steel doors, UPVC windows).
- Window Sills: 45° bevel or rounded edge to prevent dust accumulation.
- Corners: All interior/exterior corners must be rounded (R≥30mm) for easy cleaning.
4. Pest Control
- Air Curtains: Installed at all external entrances.
- Fly Traps: Installed in vestibules and entrances.
- Guards: Rat guards and mesh screens used on all drains and ventilation openings.