The Six Stages of Egg Processing
A complete egg processing line transforms raw, unchecked eggs from the poultry house into graded, sanitized, and packed products ready for retail or export. Each stage adds value and ensures food safety. Here is the recommended sequence:
Stage 1: Egg Collection
The collection system is the starting point of your processing line. It transports eggs from layer cages to the processing area with minimal handling and maximum care.
Our Egg Collection System uses automated conveyors that gently transport eggs from cage rows to a central collection point. The ST Elevator handles vertical transport, and dosing wheels control the flow rate to prevent pile-ups and breakage. The system tracks egg counts per house, tier, and row, giving farm managers precise production data.
Key decision: Your collection system capacity must match your flock size. A farm with 50,000 layers producing ~45,000 eggs/day needs a collection system rated for at least 6,000 EPH with buffer capacity for peak production hours.
Stage 2: Candling (Quality Inspection)
Candling is the first quality gate. Bright LED lights shine through each egg to reveal internal defects: blood spots, meat spots, hairline cracks, abnormal air cells, and contamination. Defective eggs are removed before they enter the grading line.
The HECU-40 is a 6-lane candling machine that handles 30,000–40,000 EPH. Each egg is oriented and rotated through the light for 360-degree inspection. Operators visually inspect the illuminated eggs and manually remove defects, or the system can be configured for automated detection on premium models.
For smaller operations, candling is integrated directly into the HEG grading machines, eliminating the need for a separate candling station.
Stage 3: Washing and Drying
Egg washing is mandatory for many export markets and increasingly expected in Indian retail. The process removes surface contamination, faeces, feathers, blood, without compromising the egg's natural protective cuticle.
The HEWD-06/10 washing and drying unit processes 6,000–10,000 EPH through two stages:
- Pre-wash: Oscillating soft nylon brushes with recirculated hot water (40–45°C) remove surface dirt
- Final wash: Fresh hot water rinse for hygienic finish
- Drying: Air knife nozzles remove all surface water from top and sides
For operations that also require grading in the same line, the integrated HEWG 06 combines washing, drying, UV sanitization, and electronic weight grading in a single pass, reducing floor space and conveyor transfers.
Important: All water contact parts must be SS-304 stainless steel for food safety compliance. The recirculation tank (200–250 litres) includes a heater with thermostat control and a suction filter to prevent debris from clogging nozzles.
Stage 4: Electronic Weight Grading
This is the core value-addition step. Electronic grading sorts eggs by weight into defined grades, allowing you to sell each size category at its optimal market price.
The HEG series (HEG 10 / HEG 30 / HEG 40) uses Thames high-accuracy load cells to weigh each egg to ±1g precision. Eggs are sorted into 3+1 or 4+1 weight categories:
| Grade | Weight Range | Market |
|---|---|---|
| Small (S) | Below 45g | Bakeries, food processing |
| Medium (M) | 45–50g | Domestic retail (budget) |
| Large (L) | 50–55g | Domestic retail (standard) |
| Extra Large (XL) | 55–60g | Premium retail |
| Jumbo (XXL) | Above 60g | Premium retail, export |
| Defect | Any | Cracked/dirty (from candling) |
The Delta/Fuji HMI displays real-time production data: eggs processed per hour, grade distribution, and defect rates. This data is invaluable for flock management, shifts in grade distribution can indicate changes in bird nutrition, health, or age.
Stage 5: Egg Printing
Printing directly on eggs is increasingly required for retail branding, traceability, and regulatory compliance. Each egg can be marked with a brand logo, batch code, production date, best-before date, and farm identification.
The HEP-20 uses Continuous Inkjet (CIJ) technology with food-safe inks approved for direct egg contact. At 18,000–20,000 EPH, it keeps pace with the grading line without creating bottlenecks.
Why print? Printed eggs command a 5–15% premium in Indian retail markets. They build brand recognition, enable traceability (required for export), and reduce counterfeiting of premium egg brands.
Stage 6: Packing
The final stage packs graded eggs into retail-ready formats. The HEPM-25 farm packer handles 25,000 EPH, automatically filling 30-egg trays by grade. The system includes:
- 6-lane infeed from grading line
- PVC belt farm packer for precise tray filling
- Empty tray feeding conveyor
- Automatic tray stacker (35–40 trays)
- Collection tables for filled trays
For retail consumer packs (6 or 10-egg cartons), the HERU-10 repacker uses a servo-based pick-and-place arm to transfer eggs from trays to consumer packaging, essential for supermarket distribution channels.
Capacity Planning Guide
| Farm Size | Daily Eggs | Recommended Line | Key Machines |
|---|---|---|---|
| Small (10K birds) | 8,000–9,000 | Basic grading | MEG 4.5 |
| Medium (25K birds) | 20,000–22,000 | Grading + candling | HEG 10 or HEG 30 |
| Large (50K birds) | 40,000–45,000 | Full line | Collection + HECU-40 + HEG 30 + HEPM-25 |
| Commercial (100K+ birds) | 80,000+ | Complete facility | Collection + Candling + Washing + HEG 40 + Printing + Packing |
Floor Space and Infrastructure
A complete processing line for 30,000 EPH requires approximately 1,500–2,000 sq ft of covered floor space with:
- 3-phase 415V power supply (15–20 kW total load)
- Clean water supply for washing (500–800 litres/hour at 40–45°C)
- Drainage for wash water
- Compressed air supply (for pneumatic egg loaders and packers)
- Level concrete floor with anti-slip coating
Hybrid Agrobots provides complete layout planning as part of our installation service, including machine placement, conveyor routing, utility connections, and operator workstation positioning.