A free flow conveyor is one where the chain can continue to run while conveyed goods can be stopped at any position on the conveyor using stoppers while work takes place. Once the work is finished the stoppers can be removed and the conveyor can continue to convey the goods.
Movetech Conveyors Pvt. Ltd. offers a line-up of Double Plus Conveyor Chains, and conveyor chains with top rollers or outboard rollers, for this application.