C.W. Brabender® Rheometric Capillary Die

The field of melt rheology is an area of concern not only to the researcher, but also to the producer and user of extrudable materials. Viscosity data help characterize material flow properties during processing operations. Data generated by melt characterization is useful in compound formulation and development as well as quality control assurance.

The rheometric capillary dies, round or slot, are designed to attach to any C.W. Brabender® extrusion system. Round capillary dies are manufactured to specifications outlined in ASTM D 5422, Measurement of Properties of Thermoplastic Materials by Screw Extrusion Capillary Rheometer.

The extrusion setup acts as a screw extrusion capillary rheometer by continuously extruding material through the die to collect pressure and mass throughput data. The data can then be conveniently analyzed using WINEXT Windows® based extrusion software when using our Plasti-Corder® Torque Rheometer, or by manual calculation. The information is used to determine pressure drop, apparent shear stress and shear rate. Flow corrections can then be applied to generate corrected shear stress, shear rate and melt viscosity.