Investigation of Preheating Conditions for Various Base Material in Hybrid Molding (abstract only)

Abstract

The strength of carbon fiber reinforced plastic increases with an increasing fiber length. However, it is significantly difficult to mold complex 3-dimensional shaped products using continuous fibers. The hybrid molding method where complex-shaped products with high strength are processed in short time is proposed. The hybrid molding method addressed in this study is one of the insert molding technology. Parts requireing high strength is processed by press molding where long or continuous fibers are utilized while complexshaped parts are integrally molded by injection molding using short fibers. The main issue of the method is the occurrence of delamination between a pressed part and injected part. It was reported from the previous study that bonding strength of hybrid molded products was improved by preheating base materials employed in press molding. However, the influence of preheating to the quality of products depending on the reinforcements of the base material is not clarified. The ultimate goal of this study is to find optimum molding conditions of each base material. This paper discusses the differences in mechanical properties between two kinds of pre-heated base materials, nonwoven fabric and woven fabric through threepoint bending test and cross-sectional observation.