Traditional Conveyors, Tilt-Tray, Cross-Belt and DCV / ICS Systems
Airport baggage handling systems (BHS) rely on effective sorting technologies to deliver bags accurately, efficiently, and reliably from check-in to aircraft. Over time, sorting solutions have evolved from traditional conveyor-based systems to advanced sorter and carrier-based technologies.
While Alstef designs and delivers traditional conveyor-based sorting and cross-belt sorter (CBS) solutions, the Group also has extensive experience integrating tilt-tray, DCV, and ICS technologies as part of complex, multi-vendor airport systems. This breadth of experience informs technology choices and system design decisions focused on long-term performance and lifecycle value.
Traditional Conveyor-Based BHS Sorting
How it works
Traditional BHS sorting uses fixed conveyor routes with mechanical diverters, pushers, or pop-up devices to direct bags to their assigned destinations. Sorting decisions occur at predefined points along the conveyor network.
Key characteristics
- Fixed conveyor layouts
- Mechanical diverters and merge points
- Zone- or pier-based sorting logic
Strengths
- Proven and widely understood technology
- Well suited to small or medium airports
- Lower initial capital cost in simple layouts
- Straightforward integration into legacy systems
Limitations
- Limited flexibility as traffic patterns change
- Increased mechanical wear due to frequent divert actions
- Risk of bags tracking loss. Need of manual coding stations,…
- Reduce numbers of bags destinations. No destination chutes.
Traditional conveyor sorting remains appropriate where throughput requirements are moderate and future expansion is limited.
Cross-Belt Sorters (CBS)
How it works
Cross-belt sorters use independent carriers fitted with small conveyor belts. Each bag is transported individually and discharged sideways at the correct destination using belt motion rather than gravity.
Why Alstef developed its own CBS
Alstef developed its cross-belt sorter, XSORT, in response to clear operational advantages over tilt-tray technology, particularly in airport baggage handling environments.
Key advantages over tilt-tray
- Gentler handling - bags are discharged by controlled belt movement, not tipping
- Better handling of mixed and unstable baggage
- Higher sorting accuracy across a wider range of bag types
- Greater operational flexibility for changing flight profiles
- Reduced sensitivity to bag orientation and weight distribution
- Reduced section height of the CBS
Additional benefits
- High throughput capability
- Modular and scalable architecture
- Compact footprint compared to large conveyor networks
- Well suited to integration with early bag storage and intelligent controls
For these reasons, cross-belt sorters have become a preferred choice for many new and upgraded airport BHS installations.
Tilt-Tray Sorters (TT)
How it works
Tilt-tray sorters transport baggage on individual trays mounted on a continuous loop. At the assigned destination, the tray tilts to discharge the bag into a chute.
Strengths
- Higher throughput than traditional conveyors
- More compact layouts
- Individual carrier control
Limitations in BHS applications
- Less tolerant of unstable, soft, or irregular baggage
- Dedicated subsystem as a black box in the BHS. Need specific skills and supplier works for any modification.
- Breakdown mode in case of TT sorter breakdown.
- Sensitivity to baggage placement and weight distribution
- Limited flexibility for mixed baggage profiles
While tilt-tray systems are well established, their constraints in handling diverse baggage types have driven the adoption of alternative sorter technologies in modern BHS designs.
DCV and ICS Systems
How it works
Destination-Coded Vehicle (DCV) and Individual Carrier Systems (ICS) transport each bag independently using vehicles or carriers routed dynamically through the system.
Strengths
- Very high flexibility and scalability
- Dynamic re-routing during disruptions
- Reduced risk of system-wide cascading failures
- Well suited to phased expansion and complex hubs
Considerations
- Higher system and software complexity
- Strong reliance on controls, data quality, and system integration
- Typically higher capital investment
Although Alstef does not manufacture DCV or ICS products, the Group has significant experience integrating these technologies into airport environments, ensuring they operate seamlessly within broader BHS architectures.
Comparison of BHS Sorting Technologies
| Technology | Throughput | Flexibility | Baggage Tolerance | Scalability | Tracking Accuracy | Capital Investment |
| Traditional conveyors | Low–Medium | Low | Medium | Limited | Medium | Low |
| Tilt-tray | Medium–High | Medium | Moderate–High | Moderate–High | Medium–High | Medium |
| Cross-belt sorter | Medium–High | Medium–High | High | Moderate–High | Medium–High | Medium |
| DCV / ICS | Very High | Very High | High | Very High | Very High | High |
Selecting the Right BHS Sorting Solution
Choosing the appropriate sorting technology depends on multiple factors:
- Passenger volumes and peak flows
- Baggage mix and variability
- Available footprint and terminal constraints
- Expansion and resilience requirements
- Lifecycle cost and maintainability
There is no universal solution. The optimal system is often a carefully integrated combination of technologies, supported by intelligent controls and a robust operations and maintenance strategy.
The Importance of Integration and Lifecycle Expertise
Regardless of the sorting technology selected, long-term performance depends on:
- Quality of system integration
- Controls architecture and diagnostics
- Maintainability and spare parts strategy
- Predictive maintenance and data-driven insights
Alstef’s experience across traditional conveyors, cross-belt sorters, and third-party technologies enables informed design decisions that balance performance, flexibility, and lifecycle value.
