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    Volume 46, Issue 4 (July 2018)

    Special Issue Paper

    Effects of Injection Molding and Storage Conditions on Polypropylene Copolymer

    (Received 21 June 2016; accepted 8 March 2017)

    Published Online: 2017

    CODEN: JTEVAB

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    Abstract

    This work focused on studying the effects of injection molding parameters (cooling time and melt temperature) and storage conditions (annealing versus cooling) on the thermal, mechanical, and optical properties of an ethylene-propylene copolymer made with and without nucleating agents. Preform properties (optical, crystallinity) affect the consistency of the preforms’ reheating via infrared lamps before stretch blow molding. The analysis of detailed preform properties as a result of both injection molding processing and postmolding treatment or preform storage conditions was lacking to correlate with the blow molding performance. This study confirmed that postmolding aging is a significant factor that affects material properties and therefore suggested subsequent blow molding. It also suggested that shorter injection molding cooling time helps to minimize the effects of aging and storage conditions. As expected, with the inclusion of the nucleating agent, clarity, yield strength, and density of the material improved.

    Author Information:

    Kalkan-Sevinc, Zehra S.
    Baxter Healthcare Corp., Medical Products R & D, Round Lake, IL

    Ling, Michael T. K.
    Baxter Healthcare Corp., Medical Products R & D, Round Lake, IL


    Stock #: JTE20160325

    ISSN:0090-3973

    DOI: 10.1520/JTE20160325

    Author
    Title Effects of Injection Molding and Storage Conditions on Polypropylene Copolymer
    Symposium ,
    Committee D20