One drawback to the production of rubber compounds in an internal mixer is the discontinuous mode of operation. One of the main targets of research af:the IKV is thus to achieve continuous, full mixing in a transfermix extruder. Liquid components, and, in particular, cross-linking systems, are to be metered in on a continuous basis. This paper presents the construction of a plant for metering in fluids on an MCT extruder and shows that, with an appropriate pressure profile in the barrel, a modified feed section and controllable injection, it is possible to run a stable mixing process continuously.