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Assessing the Impact of Punch Geometries on Tablet Capping Using a Newly Proposed Capping Index
Vivek D Patel1, Devang B Patel1, John C Sturgis1
1Natoli Scientific, A Division of Natoli Engineering Company, Inc., 100 Emlen Way, Suite # 104-108, Telford, PA-18969, USA.
Pharmaceutical Research
|June 28, 2023
Summary
Tablet capping propensity increases with punch cup depth, as shown by a new capping index. This finding helps optimize tablet manufacturing by guiding tool design and compression settings for more robust tablets.
Area of Science:
- Pharmaceutical Sciences
- Materials Science
- Mechanical Engineering
Background:
- Tablet anisotropy is linked to increased capping propensity.
- Punch cup depth is a critical tooling design variable influencing tablet anisotropy.
Purpose of the Study:
- To introduce a novel capping index (CI) for evaluating tablet capping propensity.
- To investigate the effect of punch cup depth on tablet anisotropy and capping propensity.
Main Methods:
- A new capping index (CI) was developed, defined as the ratio of compact anisotropic index (CAI) to material anisotropic index (MAI).
- Acetaminophen tablets were manufactured using various punch cup depths and compression pressures.
- Partial least squares (PLS) modeling was employed to analyze the relationship between cup depth, compression parameters, and CI.
Main Results:
- The PLS model demonstrated a positive correlation between increased punch cup depth and the capping index.
- Finite elemental analysis confirmed that deeper cup depths lead to non-uniform stress distribution, increasing capping tendency.
Conclusions:
- The proposed capping index provides a valuable tool for assessing tablet capping propensity.
- Multivariate statistical analysis aids in selecting optimal tooling and compression parameters for manufacturing robust tablets.
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