In a series of editorials with CPhI, Tim Freeman (Managing Director, Freeman Technology) looks at variables that can impact powder behaviour. In his most recent article he explores the impact of humidity on bulk powder properties. Moisture can significantly influence powder behaviour, especially flow properties and quantifying its effect is essential in order to develop effective control strategies for a specific application. There can be significant cost involved in removing water from the atmosphere in a processing environment, or indeed from within the powder itself, and this must be balanced with maintaining acceptable processing performance. The challenge is to understand a powder’s appetite for moisture uptake and, more importantly, how moisture will affect its characteristics and performance.
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