| Abstract: | An experimental study of two phase flow of polymer melts relating to injection molding has been carried out. The experiments specifically concern rheological phenomena which may occur when two melts are simultaneously injected through a runner system leading to a mold cavity. Injection in the form of annulus-core configurations and simple stratified flow are investigated. A new injection molding method is proposed which is based upon the latter technique. Encapsulation of one melt by the other occurs in the runner system and formation of a sandwich structure in the cavity results. Annulus-core injected configurations were only found to be stable when the lower-viscosity melt is in the annular region. |
