Lyo Loading and unloading System
Lyo Loading & Unloading System (Annex 1 Concept)
A loading & unloading system is an automated module that transfers filled containers (vials/PFS nests) between filling line and freeze dryer (lyophilizer) under sterile conditions.
EU GMP Annex 1 (2022 update), the focus is:
- Minimize human intervention
- Use isolators / RABS
- Ensure closed, automated transfer
Process Flow (Lyo Loading–Unloading)
Infeed from Filling Line
- Filled & stoppered vials (or PFS nests) exit filler
- Transferred via conveyor into loading system
- Accumulation table forms batches (rows)
Example systems from IMA Group use LAT (Loading Accumulation Table)
Accumulation & Row Formation
- Containers aligned into:
- Single row
- Multi-row packs
- Controlled spacing for uniform loading
Critical:
- No glass-to-glass contact
- Laminar airflow maintained
Transfer to Freeze Dryer
Two main technologies:
A. Push–Pull System
- Mechanical pusher loads vials onto shelves
- Fixed system (high reliability)
B. Transfer Cart (AGV / TCAR)
- Mobile unit carries product into lyophilizer
- More flexible for multiple dryers
Loading into Lyophilizer Shelves
- Loading done:
- Row-by-row
- Full pack placement
- Maintains constant shelf level
Lyophilization Process (Freeze Drying)
- Freezing → Primary drying → Secondary drying
- Product stabilized for long-term storage
Unloading from Freeze Dryer
- Reverse of loading:
- Push/pull or cart removes vials
- Single-row discharge for downstream compatibility
Speeds up to 400–700 vials/min depending on system
Outfeed to Next Stage
After unloading:
- Capping / sealing
- Inspection
- Labeling / packaging
Unloading from Freeze Dryer
Annex 1 Compliance
Under EU GMP Annex 1, the system must ensure:
- Contamination Control Strategy (CCS)
- Fully documented risk-based approach
- Barrier Technology
- Isolator preferred
- RABS acceptable with justification
- No human intervention
- Fully automated loading/unloading
- Sterile airflow
- Unidirectional airflow (Grade A)
- Cleanability
- CIP/SIP compatibility
- No exposed moving parts above product
- Critical Design Challenges
- Maintaining sterility during transfer
- Avoiding vial tipping / breakage
- Synchronization with filler & lyophilizer
- Handling different formats (2R–100R vials)