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AAPS PharmSciTech. 2003 December; 4(4): 523–530.
Published online 2003 October 18. doi:  10.1208/pt040466
PMCID: PMC2750659

The 3-D model: Does time plasticity represent the influence of tableting speed?


The objective of this study is to test the hypothesis that time plasticity (parameterd from 3-D modeling) is influenced by tableting speed. Tablets were produced at different maximum relative densities ([var rho]rel,max) on an instrumented eccentric tableting machine and on a linear rotary tableting machine replicator. Some 3-D data plots were prepared using pressure, normalized time, and porosity according to Heckel. After fitting of a twisted plane, the resulting parameters were analyzed in a 3-D parameter plot. The materials used were dicalcium phosphate dihydrate (DCPD), spray-dried lactose, microcrystalline cellulose (MCC), hydroxypropyl methylcellulose (HPMC), κ-carrageenan (CAR), and theophylline monohydrate (TheoM). The results show that tableting speed especially influences the parameterd (time plasticity) of the 3-D model for plastically and viscoelastically deforming materials such as MCC, HPMC, CAR, and TheoM. For more plastically deforming materials such as MCC, HPMC, and TheoM, a subtle influence on ω is also visible. The stages of higher densification are affected more than the stages of lower densification. Brittle materials such as DCPD exhibit no influence of tableting speed. The influence of speed on spray-dried lactose is minor. The results are valid for data obtained from an eccentric tableting machine and also for data from a linear rotary tableting machine replicator. Thus, the empirically derived parameter time plasticityd really represents the influence of time.

Keywords: rotary tableting machine simulator, eccentric tableting machine, tableting speed, excipients, compression

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
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