A Study on Compression Molding Process of Long Fiber Reinforced Plastic Composites -Effect of Needle Punching on Viscosity-

장섬유강화 플라스틱 복합재의 압축성형 공정에 관한 연구 -점도에 미치는 니들펀칭의 영향-

Compression molding was specifically developed for replacement of metal components with composites. As the mechanical properties of the products are dependent on the separation and orientation, it is important to research the fiber mat structure and molding conditions. In this study, the effects of the fiber mat structure(NP: 5, 10, 25punches/$\textrm{cm}^2$) and the mold closure speed($\dot{\textrm{h}}$=0.1, 1, 10mm/min) on the viscosity of composites were discussed. The composites is treated as a Non-Newtonian power-law fluid. The parallel-plate plastometer is used and the viscosity is obtained from the relationship between the compression load and the thickness of the specimen.