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From testplastic.com
Creep experiments are a valuable method for studying the viscoelastic properties of polymer
melts. The zero shear viscosity can be calculated at many temperatures and plotted as a function of temperature.
Many Engineering textbooks use the zero shear viscosity for extrusion and die design. The viscosity is calculated from the slope of the compliance versus time or strain versus time curves. Viscosity is 1 / slope of the curve in the steady state (linear).
The following creep is a typical example for low-density polyethylene.
Zone - This term is the zone during which the calculations were made. If data from all zones is selected, the zone is zero.
Stress - Stress is calculated as the average of all stresses for all selected data points. At each data point, stress is calculated as the product of torque and the stress constant.
Products & Services
Rheometers characterize a liquid according to its viscous properties and elastic responses.
Viscometers define viscous properties of a fluid at ambient or defined temperatures.
Plastic extrusion services suppliers specialize in extruding plastics and polymer compounds into custom and standard profiles and shapes.
Extrusion includes the manufacture of lengths of cross-sectional shapes and profiles. Extruded products are available in a wide variety of materials and material combinations.
Aluminum extrusion services providers specialize in extruding aluminum and aluminum alloys into custom and standard profiles and shapes.
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