Typical granule / powder blends contain Magnesium Stearate as an internal lubricant to help prevent of tablet sticking and reduce die friction. This often results in softer tablets and poor dissolution.
The ELS is a system designed to spray a measured amount of lubricant onto punch tips and die bores to create a lubricant film on those surfaces. The ELS helps prevent typical tableting problems that are associated with the use of internal lubricants.