Journal
ADVANCED POWDER TECHNOLOGY
Volume 31, Issue 2, Pages 770-781Publisher
ELSEVIER
DOI: 10.1016/j.apt.2019.11.031
Keywords
Discrete element method; Tablet press; Feed frame; Granular flow; Residence time analysis; RTD; Incomplete die filling; Tablet weight homogeneity
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Funding
- Robert Bosch Packaging Technology GmbH
- Austrian COMET Program under the Austrian Federal Ministry of Transport, Innovation and Technology (BMVIT)
- Austrian Federal Ministry of Digital and Economic Affairs (BMDW)
- Federal State of Styria (Styrian Funding Agency SFG)
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Tablets can be manufactured using a rotary tablet press, which consists of a feed frame followed by the compression and compaction of the powder and subsequent ejection of the tablets. From Quality by Design (QbD) perspectives the feed frame plays a critical role and effects products critical quality attributes (CQAs). Thus optimizing this stage is of huge interest. It is preferable to achieve narrow residence time distributions of the powder in the feed frames as well as homogeneous tablets with respect to their height, weight and tensile strength. In the present study three design approaches of feed frames are simulated using the Discrete Element Method (DEM). We investigate the influence of operational input parameters (i.e., rotational rates) on the behaviour of a free flowing and a cohesive material. The detailed simulation data allows us to compare the mentioned setups in terms of residence times, tablet masses and occurring deviations. Therefore, we are able to determine the optimal feed frame and process settings for both free-flowing and cohesive powders. (C) 2019 Published by Elsevier B.V. on behalf of The Society of Powder Technology Japan.
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