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A Uniaxial Compression Experiment with CO2-Bearing Coal Using a Visualized and Constant-Volume Gas-Solid Coupling Test System
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Compression-decompression modulus (CDM) - an alternative/complementary approach to Heckel's analysis.

Devang B Patel1, Vivek D Patel1, Yash Patel2

  • 1Natoli Scientific, A Division of Natoli Engineering Company, Inc., Telford, PA, USA.

Pharmaceutical Development and Technology
|September 1, 2022
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Summary
This summary is machine-generated.

A new modulus-based method characterizes material compression behavior and tablet mechanical strength (TMS). This approach offers advantages over traditional Heckel plots, aiding in early material development and troubleshooting tablet failures.

Keywords:
Compression modulusHeckel’s analysisdecompression modulusdeforming materialsfragmenting materials

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Area of Science:

  • Pharmaceutical Sciences
  • Materials Science
  • Chemical Engineering

Background:

  • Tablet mechanical strength (TMS) is crucial for drug product quality and performance.
  • Traditional methods like the Heckel plot have limitations in characterizing compression behavior, especially during decompression.
  • Understanding material compression behavior is key to optimizing tablet manufacturing.

Purpose of the Study:

  • To develop and validate a novel modulus-based approach for characterizing material compression behavior.
  • To correlate material compression parameters with tablet mechanical strength (TMS).
  • To propose a new classification system for tablet materials based on compression and decompression properties.

Main Methods:

  • Generated force-displacement profiles using a compaction emulator (Presster™) at various pressures and speeds.
  • Evaluated compression profiles using Heckel plots and the proposed material modulus method.
  • Correlated compression parameters with TMS using principal component analysis and regression.

Main Results:

  • The novel modulus-based method successfully characterized material compression behavior.
  • Compression modulus negatively correlated with TMS, while decompression modulus positively correlated.
  • The proposed method is independent of particle density and overcomes Heckel plot limitations regarding decompression.
  • A two-dimensional compression and decompression modulus classification system (CDMCS) was developed.

Conclusions:

  • The modulus-based approach provides a robust method for evaluating material compression and predicting TMS.
  • The CDMCS can be utilized for defining critical material attributes and diagnosing tablet failure modes.
  • This novel approach enhances material characterization in early pharmaceutical development stages.