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.

Highlights
  • Pull-off speed freely adjustable up to 7000 m/min
  • Use of a high-resolution force transducer with a resolution of 0.05 mN
  • The strand is wound on a haul-off wheel and can be further inspected
  • The SLR is supplied with melt by an extruder with deflection head
  • Alternatively, an online rheometer can be used as a melt pump in addition to the extruder
  • Determination of the yarn force under different conditions
  • Optimization of the spinning process in the production of synthetic fibers
  • Operation via PC software RheotensE
Technical specifications
  • Pull-off speed up to 7000 m/min
  • Use of a high-resolution force transducer with a resolution of 0.05mN
  • The strand is lifted off the haul-off wheel via a Venturi nozzle
  • The SLR is supplied with melt by an extruder with deflection head
  • Determination of elongation viscosity from yarn force and strand geometry
  • Optimization of the spinning process in the production of synthetic fibers
  • Optional measurement of the strand profile via optical measuring system
Applications

Elongation Spin Line Rheometer HD Polyethylene

In the following graph, a measurement with high-density polyethylene at constant, slow acceleration is plotted as an example. The test is carried...

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Spin Line Rheometer 8 Step Measurement PA

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...

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Spin Line Rheometer fed by MBR with PET

The following graphic shows measurements with PET at 300°C to determine the processing window. Analogous to the production machine, a 20 mm extruder...

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