Firefighters tackled two fires at Hartlepool's Niramax plant today
Smoke could be seen for several miles as the fires burned, with five fire crews in attendance.
A spokesman for Cleveland Fire Brigade said: "We were called to a report of a fire at Niramax, on Windermere Road in Hartlepool.
"Five fire appliances were in attendance to the report of a fire on a conveyor belt and a rubbish pile fire.
"There was 30% fire damage to the conveyor belt and a quantity of rubbish was destroyed.
"The last two fire appliances left the scene at 4.51pm."