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Effect of fountain flows on injection-molding-induced morphology

from SPE Plastics Research Online

Polypropylene (PP) is a widely used plastic in the automotive industry that can be easily injection molded. The performance of molded products is affected by the processing-induced sandwich ('skin and core') structure. We have been studying the impact of morphology on the surface properties of injection-molded PP, because scratch resistance and paintability are essential requirements for automotive parts. Molten PP injected into a cold tool freezes immediately at the cavity wall. Consequently, crystal morphology forms under transient temperature and flow-rate conditions. Although full control of surface morphology is highly desired to improve the material's surface properties, the mechanism governing the injection-molded surface morphology is not completely understood. more

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