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Morphological analysis of microcellular PP produced in a core-back injection process using chemical blowing agents and gas counter pressure

Abstract : A complete experimental analysis of the microcellular injection process using Chemical Blowing Agents (CBA) with Gas Counter Pressure (GCP) and core-back expansion is presented. Three different types of polypropylene, neat and charged, were mixed with two different CBAs and injected into a plate mold with varying process parameters. First, an exhaustive cartographical mapping of the plate morphology is analyzed. In a second step, the relation between injection parameters and the resulting morphology is investigated. The results show that injection time affects the cellular structure. The formulation, especially the type of chemical foaming agent, controls the average bubble radius. Compared with classical injection process, the use of CBAs, combined to Gas Counter Pressure and core-back process, allows obtaining parts with good surface aspect, more homogeneous cellular structures and smaller bubble radius
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Submitted on : Friday, October 16, 2015 - 3:03:07 PM
Last modification on : Thursday, September 24, 2020 - 5:22:55 PM
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José Antonio Reglero Ruiz, Michel Vincent, Jean-François Agassant, Aurore Claverie, Sébastien Huck. Morphological analysis of microcellular PP produced in a core-back injection process using chemical blowing agents and gas counter pressure. Polymer Engineering and Science, Wiley-Blackwell, 2015, 55 (11), pp.2465-2473. ⟨10.1002/pen.24136⟩. ⟨hal-01182895⟩

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