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Control Factors of Foam Morphology in Microcellular Foaming
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Teramoto, Gensei / Ae, Haruhiko / Kanai, Toshitaka
We investigated the microcellular foaming of polypropylene with supercritical nitrogen (N2) in order to understand the most influential factors. In these experiments, an average diameter of 30 ƒÊm, typically difficult to attain, was achieved for the foamed polypropylene. The most influential molding factors for the microcellular foaming process were found to be ƒ¢P (the difference between the injection pressure of the supercritical N2 in the cylinder and the back pressure of the screw), the throughput of the supercritical N2 and the resin temperature.
Key words: Microcellular / Supercritical Fluid / Foam / Nitrogen / Polypropylene