An X-ray inspection reject system links the X-ray result to the correct product, carries that identity to the reject point and removes the failed item into a controlled area. Depending on the pack and line, rejection may use air blast, a pneumatic pusher, a drop or multi-flap arrangement, a retracting belt or a lane diverter.
Application engineering
How is X-ray rejection kept accurate?
The reject station must preserve the relationship between the X-ray decision and the physical product as conveyor speed and product spacing vary. Encoder-based tracking, product sensors and controlled timing windows can be used to keep the reject action aligned with the correct pack.
The mechanism is chosen around product mass, stability, fragility and the required reject direction. A two-bin design can separate failure categories when supported by the inspection-system outputs—for example, directing contaminant failures and quality failures to different controlled destinations.
For higher-integrity applications, independent confirmation can verify entry into the reject area. Bin-present, full-bin, access-open and low-air signals can be included in the permitted-to-run logic, with clear alarms and a defined response if any critical state is not confirmed.
Key application considerations
- Accurate tracking from X-ray to reject point
- One- or two-bin reject layouts
- Pusher, air, flap, belt and divert options
- Independent product-removal confirmation
- Secure access and bin monitoring
- Inspection-system and PLC integration