For rapid, convenient determination of melt index values, Zwick's Xflow series covers the entire spectrum, from cost-effective manual operation to instruments featuring operator-friendly automatic test sequences.
Instead of the usual weights, the new Aflow extrusion plastometer uses cutting-edge force control, which automatically controls stepless adjustment of test loads up to 50 kg, making melt index determination faster and more reliable. The optimized test sequence eliminates operator influence, ensuring reproducible test results. If, for example, polymers with unknown MFR are being tested, APC automatically sets the relevant test parameters. With traditional plastometers, weight application frequently involves impact loads; this is greatly reduced thanks to Aflow's electro-mechanical drive, so that control of multi-stage tests is also largely shock-free. At the end of the test Aflow can be cleaned effortlessly at the touch of a button.
While Aflow is designed for 24-hour, high-throughput use, Mflow is intended for an average level of testing as found in quality assurance and goods inwards checks and now offers faster, more convenient determination of MFR and MVR. Previously the different weights required by each polymer being tested had to be positioned manually by the operator, a laborious and potentially hazardous procedure. Zwick's new modular system solves this problem by means of an auxiliary unit which provides program-controlled weight positioning and removal. Manual weight selection is possible by simply withdrawing the selector and re-inserting it in the desired position. The instrument contains test weights in accordance with current standards up to 21.6 kg and can be controlled via integrated electronics or a PC as required.
The Xflow range is completed by the cost-effective Cflow, an instrument designed for manual testing and suitable for lower testing throughput rates.