The Flexmove plastic slat conveyor systems utilises plastic chains to transport products in an efficient manner.
The plastic chain allows a certain amount of product slippage and this can be useful when merging two or more products from different sources.
In the video here you can see that these round products are perfect for merging because they are flat and offer little friction to the top surface of the belt. No automation or diverter gates are necessary to manage product flow.
Link = http://www.flexmove.co.uk/Conveyor-Applications.html