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Improvement of the material motion in a rotary processor
J Vertommen1, B Jaucot, P Rombaut
1Laboratorium voor Galenische en Klinische Farmacie, Katholieke Universiteit Leuven, Belgium.
Pharmaceutical Development and Technology
|December 1, 1996
Summary
Improving rotary processor movement, not choppers, optimizes water addition for consistent pellet size. This enhances powder processing and pellet quality.
Area of Science:
- Pharmaceutical technology
- Chemical engineering
- Materials science
Background:
- Pelletization is a critical process in pharmaceutical manufacturing.
- Water addition rate significantly impacts pellet size and distribution.
- Insufficient water spreading at higher rates can lead to variability.
Purpose of the Study:
- To investigate the hypothesis that insufficient water spreading causes variability in pellet size.
- To evaluate technical modifications aimed at improving water distribution during pelletization.
- To determine the impact of these modifications on pellet characteristics and dissolution.
Main Methods:
- Intensified agitation in a rotary processor using baffles and PTFE coating.
- Installation and evaluation of a chopper.
- Analysis of pellet size, size distribution, and agglomerate percentage.
- Assessment of pellet dissolution characteristics.
Main Results:
- Improved spiral, rope-like movement moderated the influence of water addition rate on pellet size.
- A chopper did not significantly affect pellet size, distribution, or agglomerates.
- Technical modifications did not directly impact pellet dissolution characteristics.
Conclusions:
- Optimal spiral movement ensures effective water spreading, making choppers unnecessary.
- Remaining influence of water addition rate on pellet size is likely due to processing time and air-powder interactions.
- The study confirms the importance of process control for consistent pellet quality.