The effects of feed frame parameters and turret speed on mini-tablet compression

Hui Ping Goh, Paul Wan Sia Heng, Celine Valeria Liew

Research output: Contribution to journalArticleResearchpeer-review

17 Citations (Scopus)


Die filling is a critical process step during tablet production as it defines the tablet weight. Achieving die fill consistency during production of mini-tablets, tablets with diameters ≤6 mm, is considerably more challenging. Although die filling in rotary presses had been studied in relation to the feed paddle design, paddle speed, and turret speed, it is unclear how these process variables could impact mini-tablet production and product properties. In this study, 1.8 and 3 mm mini-tablets were prepared using a rotary press with multiple-tip tooling using different process configurations. Mini-tablet weight variation within and across compaction cycles were determined using data from compression roller displacement and mini-tablet weight. Higher die fill densities were achieved with a flat feed wheel paddle and high paddle speed. This was attributed to better granule fluidization in the feed frame, which also increased the intercycle weight variation and reduced tensile strength. The turret speed did not impact mini-tablet properties significantly. Granule overlubrication in the feed frame potentially reduced mini-tablet tensile strength during compaction. The number of paddle passes in the die fill region was correlated to mini-tablet die fill performance. Findings from this study could provide better insights into the relationship between process variables and mini-tablet product quality.

Original languageEnglish
Pages (from-to)1161-1171
Number of pages11
JournalJournal of Pharmaceutical Sciences
Issue number3
Publication statusPublished - 1 Mar 2019
Externally publishedYes


  • compression
  • die fill
  • multiple-tip tooling
  • paddle design
  • physical characterization
  • powder technology
  • solid dosage forms
  • tableting
  • tablets
  • weight variation

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