Reducting Internal Void using Recycled Polystyrene Materials Molded with Hot Press Technology

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  • リサイクルポリスチレン材の高温圧縮成形における内部空隙の低減方法

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This study aims to investigate a new high-temperature compression molding method that uses dies for recycled polystyrene in flake form. When successfully developed, this proposed molding method is expected to contribute to reduced costing and CO2 emissions. Since the colors of the material do not mix, this method enables designs that have not been possible with conventional methods. In this study, sheet products, which are the most basic shape achieved with the hot press, were formed using this method. The thickness of the products was measured and bending tests were performed to investigate the mechanical characteristics of the products that were formed. In the forming method usually used, voids are confirmed within the product. Therefore, in order to remove internal voids, an attempt was made to form the product using sequential molding and bottom heat molding. The results confirmed the plate material could be largely removed with bottom heat molding. Also, the bend-strength of the molded product using both sequential and bottom heat molding increased by 10% when compared to conventional molding methods.

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