Reducing air entrainment problems in your roll press
This article discusses the problems entrained air creates during the roll-press compaction of powders. The author describes a powder-feeding system that reduces air entrainment and presents valuable research on how entrained air affects the compaction process, the resulting agglomerate, and the combined operation of the powder-feeding system and the roll press.
Powders pose special problems during roll-press compaction due to the large amount of air entrained between the finely divided particles [80 percent porosity is typical]. Entrained air creates three types of problems for a roll press.