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Article | REF: AM3343 V1

High Density Foamed Polymers in Extrusion

Authors: Rudi SALMANG, Francis PINSOLLE

Publication date: July 10, 2014, Review date: February 5, 2025 | Lire en français

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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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