The system is based on a conical, twin-screw compounder with an integrated backflow channel. By operating with 100% backflow, the extruder becomes a batch mixer with a well-defined residence time. This micro compounder can be used with co- or counter-rotating screws and is equipped with an inert gas flush system. It is ideal for the precisely controlled reactive extrusion of high-viscosity melts. By running the instrument in backflow mode, the required reaction time for the reactive mixture can be controlled easily. At the end, the bypass valve can be opened and the sample is extruded. By measuring the torque of the drive motor and the pressure in the backflow channel, the reaction process can be monitored effectively.

The HAAKE MiniJet system is, in effect, a small ram injection-molding system. Material consumption is reduced dramatically in comparison with conventional injection molding units due to (1) reduced cylinder volume, resulting in a smaller quantity of required material; and (2) almost complete transportation of material into the mold, leading to minimal loss and waste. An injection pressure of up to 1200 bar can be realized, thus enabling the processing of highly viscous materials. When used in conjunction with HAAKE MiniLab, the MiniJet is an ideal complementary tool for compounding and sample preparation. Its vertical machine design features: (1) simple loading of powders and pellets within the system cylinder; (2) quick and easy removal of the heated cylinder for melt applications when connecting to the HAAKE MiniLab or other extrusion systems; (3) simple design for changing molds without tools and for designing custom molds.