The "new-generation" Coflow4(TM) intermeshing internal mixer uses less motor power peak and specific energy than all traditional intermeshing and tangential internal mixers. The Coflow4(TM) mixer provides the following advantages: better quality, 20% to 45% increase in productivity depending on your rotor length-to-diameter ratio, improved heat transfer over 50% reduction in dust-stop leaks, better for one-pass or multiple-pass mixing, wide range of process materials, better wear life, retrofit capabilities and lower mixer cost. It is more cost effective to retrofit your traditional mixer with a Coflow4(TM) mixer when your chamber bores and rotors are worn out, and you are ready for a rebuild rather than investing into the same old mixing technologies that yield small return. Owing to the optimal constant rotor length-to-diameter ratio and the superior mixing capabilities of the co-flow mixing technology, it will be beneficial to try and use the Coflow4(TM) mixer to compound the materials, which could not be compounded before by the old traditional mixing technologies or the two-roll mills.