Binder content does not describe where binder sits inside a granule. Evidence from PVA–alumina systems explains why drying and adsorption chemistry deserve investigation, and how to select measurements before changing the formulation or dryer.
Two lots that pass the same incoming flowability spec can still granulate differently after roller compaction. The reason usually traces to ribbon density, which responds to roll force, gap width, and feed screw speed as an interacting set, not to roll pressure in isolation.
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