Spinning tests under process related conditions
The Spin Line Rheometer (SLR) is a measuring system for characterizing the spinability of plastic melts. The vertically extruded plastic filament is pulled off by means of a stretch rheometer (Haul-Off) at up to 7000 m/min. Meanwhile, the force in the strand is measured. The measuring system is optimized to allow the largest possible draw-off ratios and thus to reproduce the synthetic fiber spinning process on a laboratory scale.
The complete system consists of an extruder, a deflection head and an elongation rheometer. Optionally, an online rheometer can be used as a melt pump instead of the deflection head. The actual measuring head is a strain rheometer in the Haul-Off design.
In the following graph, a measurement with high-density polyethylene at constant, slow acceleration is plotted as an example. The test is carried...
Plotted are 8 step measurements with polyamide. The measurements are carried out at 270°C with a die L/D = 30 / 2 mm in the deflection head and...
The following graphic shows measurements with PET at 300°C to determine the processing window. Analogous to the production machine, a 20 mm extruder...
