Cohesive powders tend to behave more like fluids when pressurized or subjected to forced flow. The study focuses on understanding these characteristics and determining how they correlate with known powder flowability parameters that describe dynamic flow behavior, shear properties, and bulk properties, including permeability and compressibility.
Powder extrusion, flow in confined spaces and the normal stresses generated when powders are sheared, are all examined. A number of different powder types are evaluated, including cohesive powders like CRM-116 limestone, free-flowing powders such as spray dried and coarsely milled lactose, and calcium sulphite hemihydrate. The ways in which particle size, shape, texture, and flow agents affect powder behavior is also studied.
The FT4 powder rheometer provides comprehensive powder flowability data that can be correlated with processing experience to aid efficient processing and quality control. It provides automated shear testing, dynamic flowability, and bulk properties measurements making it a universal powder tester for formulators, process engineers, and QA specialists.
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