Effect of mill types on the properties of granules produced by roller compaction technique
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Abstract
Mill type, a less explored parameter in roller compaction, may significantly influence granule properties and interact with other process variables due to the diverse mill designs available today. This study aimed to investigate the effects of mill type (bar and knife rotors) and its interactions on granule size distribution and bed density using a full 23 factorial design, varying mill speed (250–500 rpm), roll force (4–8 kN/cm), and screen size (1.59–2.36 mm). The results showed that mill speed was the most influential parameter, interacting with mill type to produce opposite effects on granule size and density due to differences in milling mechanisms and rotor-screen gap. Additionally, the bar rotor tended to produce larger granules and a denser bed than the knife rotor. These findings emphasize the importance of mill type selection and its interaction with process parameters in optimizing granule properties, contributing to improved roller compaction performance and final product quality.
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