University of Connecticut

Polymer Processing

Thermo Scientific HAAKE MiniLab II and MiniJet

Thermo-Scientific-HAAKE-MiniLab-II-and-MiniJet The Thermo Scientific HAAKE MiniLab compounds small sample amounts of 7 cm3. This miniaturized, high-tech tool is perfect for research in material science, such as testing of new additives and the development of new formulations. 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.

 

Thermo Scientific Prism TSE 16 TC Twin-Screw Extruder

Thermo-Scientific-Prism-TSE-16-TC-Twin-Screw-Extruder This small twin-screw extruder is designed for bench-top operation. It includes pre-mixers, chill rolls, strand pelletizing lines, and an air-cooled face-cut system. The horizontally split barrels are quick to open, giving easy access to screws and process contact surfaces for configuration changes or cleaning. The barrel has additional ports for feeding solids and/or liquids, or for venting. A simple manual control panel houses controls and instruments to operate the extruder and feeders. Low maintenance, brushless, variable-speed AC motors drive the screws at up to 500 rpm. This twin-screw extruder can be used for research, development or small-scale production.

 

Carver Lab Press

CarberLabPress This hydraulic heat press is available for compression molding resins into sheets at temperatures of up to 300 °C (570 °F) at a maximum force of 30 tons. Two chambers (four platens) are available to accommodate molds as large as 30 × 30 cm2 (12 × 12 in.).

 

C. W. Brabender

Brabender This apparatus is available for processing and mixing small batches of polymers, from dry powders to highly viscous melts, under electrically controlled temperatures of up to 400 °C at various operating speeds (up to 100 rpm, 7.5 hp). The types of mixers available include a 650-mL capacity head with fixed sigma blades and a dispersion trough for low viscosity fluids or dry powder blending; a 60/100-mL variable bowl capacity with exchangeable roller, cam and sigma blades and a ram closure with provision for inert-gas injection; and a 30-mL-capacity head with roller blades and a similar ram closure. The roller blades create intensive mixing and impose a strong kneading force. These blades are typically used with molten thermoplastics. The sigma blades are designed for low shear rates creating a tumbling and kneading force while imposing a strong compressive force.Applications include mixing of dry powders and solid-liquid systems. The cam blades are designed for medium shear rates and impose a combination of milling, mixing and shearing forces for application on elastomers.