Cummins said firefighters were screening workers at the facility at 414 E. Hudson to see whether any of them needed to be taken to the hospital for smoke inhalation they may have suffered while they were in the building.
Other than possible smoke inhalation there were no reported injuries.
The fire reportedly broke out on a conveyor machine at the recycling plant.
Though smoke spread and a sprinkler system about the machine was activated, Cummins said it was a relatively small fire.
“We’ve had similar fires at the building in the past,” he said.
Less than a year ago, about 20 people at Royal Oak Recycling were evacuated and the plant closed for the day after a machine caught fire in November 2016. No one was injured.