See the overview of the open flap detect sensor and reject in the video below.
The optional open flap detect sensor and reject available on the PDI Model CTA Case Sealer and Model CTL combination Weigher and Sealer detects boxes that have not been folded or sealed properly and prevents them from moving on to the palletizing station.
The open flap detect sensor is placed at the end of the machine and is attached to the top conveyor. It is located just above the top of the box. If the sensor detects the flap of a box while the reject system upstream photoeye is blocked, it will know the box hasn’t been folded or sealed properly and will reject it.
The reject system is fully electric and runs without air cylinders. This means there is no need for mechanical arms on the reject system, which removes pinch points for the operator. Once the reject system is energized, the reject conveyor belt will simply roll the box off the production line.