Computer modelling | twin-screw extrusion


tions of different compounding machines that cover shapes, clear- ances, torque and anything else from a hardware, design or power stand- point that affects viscosity, tempera- ture and other rheological aspects of processing. The material specifi cations are readily


available owing to the many sources that provide them, including manufacturers. Machine data fi les are a little more diffi cult to obtain but the information is available and can be accessed. “The accuracy of the results a compounder gets


from modelling software depends on the accuracy of the data in use,” says Dreiblatt. “Good data means good results.”


Analyzing screw elements The WinTXS software, developed by Polytech and sold by Century, is for co-rotating, intermeshing, modular, twin-screw extruders. On the machine side, users build a simulated extruder with the software based on axial screw confi gurations. The program automatically divides


each screw component into a computational element. The software calculates the effect of features such as power, axial temperature, resin and additive melting, pressure profi les, extruder geometry, material properties and operating conditions into defi ned values that, when calibrated, are considered valid for process development. The software simulates all compounding actions:


solids conveying, melting, mixing, melt conveying, pressurization and die fl ow. It also simulates the compounding of complex materials such as fi lled


Simulation software can help optimise


parameters for extruders such as this Century 70-mm machine


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