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Polymers Home > Rheology > Rheology Solutions for Polymer Process Problems

Rheology Testing Solutions for Processing Polymers
Rheology Testing for Polymer and Plastics Processing Problems

Intertek provides Rheology expertise and capabilities for clients with analysis and problem-solving with polymer processing. Intertek experts tackle a wide range of polymer and plastics processing issues including common problems listed below:

Processing Problem Possible Rheological Cause Suggested Analyses to Confirm Cause
Poor Surface Finish (films and mouldings) High Elasticity. Excessive Shear and/or tension thinning behaviour. Inappropriate MWD. Capillary rheometry. Die Swell analysis. Rotational rheometry. Stress relaxation tests.
Tape, Fibre Breakage and Bubble bursts. Inappropriate extensional viscosity behaviour. Capillary rheometry at 2 or more temperatures
Excessive Draw Excessive tension thinning behaviour. Inappropriate MWD. Capillary rheometry at 2 or more temperatures. Stress relaxation tests.
Low Strength, Fibre Coalescence Viscosity too low. Capillary/Rotational rheometry.
Edge Curl, Excessive shrinkage. Melt memory. Excessive elasticity. MWD too broad. Rotational rheometry. Die Swell. Stress relaxation.
Film Splits, film fibrillation. Viscosity too low. Elasticity too high Rotational rheometry. Die Swell. Stress relaxation
Delamination on coextrusion. Mismatch in flow properties of components. Temperature dependence of rheological properties.
Uneven thickness (films and fibres) Excessive tension thinning behaviour. Capillary rheometry at 2 or more temperatures
Die Drool, die deposits MWD too narrow. Viscosity too low. Melt stability analysis.
Contact Intertek for more information on Rheological Analysis and Polymer Processing.
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