Mechanical Properties of Injection Molded Products Fabricated by Direct Fiber Feeding Injection Molding

Direct-fiber-feeding injection molding (DFFIM), with the improvement of the screw and cylinder and a fiber-direct-feeding method, is a new way to make short fiber reinforced composite material from one step by throwing fiber into a formation machine directly, in which the traditional compounding process can be unnecessary. At current study, the well-distributed fiber and improved interface/interphase between fiber and plastic are aimed to achieve a cost-performance-ratio, through those achievements such as design of screw or the other combination conditions during DFFIM process. As for carbon fiber, besides filaments, there are many types including tow, staple yarn, chopped strands, compound, and so on. Those different reinforcement forms were adopted and used to make CFRP by DFFIM to investigate their mechanical properties. In particularly in this paper, PA6 resin and CF/PA66 commingle yarn was used as matrix and reinforcements for comparison. It is observed that the SEM dispersion state and interface /interphase increased.