ANALYSIS OF INTERFACE OF TWO LAYER MOLDED PRODUCT BY SIMULTANEOUS COMPOSITE INJECTION MOLDING

摘要

Simultaneous Composite Injection Molding (SCI) is a injection molding technique to impart two layered injection molded composites, which consists of top and bottom layers, by simultaneously feeding two resins through independent cylinders. We have previously reported that low cylinder temperature and low injection speed were key parameters for producing excellent two-layered specimens, preventing commingling between the layers. In this study, the focus shall be on the interface structure in two layer molding in a molding parameter under which a desirable two layered specimen can be obtained. The used materials consist of blend of PC+ABS, a weight ratio of 6 to 4. According to high magnification SEM photos, internal structure was not observed in a region near the interface of the resin layers. Although elongated structure was observed near the mold wall, round shape was seen near the interface. The thickness of interface region was measured.