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Article | REF: AM3343 V1

High Density Foamed Polymers in Extrusion

Authors: Rudi SALMANG, Francis PINSOLLE

Publication date: July 10, 2014

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3. Mechanisms

The expansion process can be modeled in three stages:

  • initiation of the bubble formation process: nucleation ;

  • bubble growth: swelling ;

  • structure stabilization.

3.1 Nucleation

There are two nucleation mechanisms:

  • homogeneous nucleation or auto-nucleation, which leads to the appearance of randomly distributed microbubbles in a pure, perfectly homogeneous matrix;

  • heterogeneous nucleation – heterogeneous because it takes place in a matrix made up of several phases – which allows better "control" of the distribution of microbubbles:

    • ...

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