A scanner belt is the moving strip that carries bags through an x-ray. Put the tray on the scanner belt, wait at the scanner belt.
It goes at a fixed speed, which is why the queue moves at the pace of the slowest tray. Laptops and liquids come out precisely because the scanner belt image cannot see through them clearly.
1nounscanner beltThe moving strip that carries bags through an x-ray.
“His coat went down the scanner belt without him.”
scanner belt is a belt.
Practised in Airport & Flying