Optimising Extrusion Die Design on the Basis of Resin Rheology, 2001 European PLC Conference Proceedings
Natti S. Rao--Extrusion dies can be designed on the basis of empirical data gathered from experience and then optimised by means of experiments. This kind of trial and error method can involve, particularly, in the case of large production units huge costs.
This paper shows as to how a die can be dimensioned by utilising the knowledge of the rheological behavior of the resin which the die is required to process, in order to obtain a melt at a low shear, low temperature and low pressure. The design principles presented can also be used to avoid melt fracture at high throughputs and, in addition, to assess the performance of an existing die. Examples of dies used in pelletizing, blow molding, blown film and extrusion coating illustrate the design procedures treated. Comparisons between the results of modeling and practice have been discussed.
Optimising Extrusion Die Design on the Basis of Resin Rheology, 2001 European PLC Conference Proceed