Download PDF by Natti S. Rao: Diagnostics of extrusion processes

By Natti S. Rao

The frequent use of huge scale devices for production blown movie, blow-molded articles, flat movie, and extruded pipes necessitates troubleshooting on web site. This booklet presents useful computational instruments which might be utilized simply at the store ground to acquire quickly suggestions in those and lots of different components of polymer extrusion.

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By using different barrel temperature profiles, it was found that the temperature profile given in Fig. 20 with a high temperature near the feed zone would eliminate the bubbles. The predicted result was confirmed in practice. 20 Barrel temperature used to eliminate air bubbles The examples presented here show that the use of computer programs in design work minimizes experimentation and in many cases eliminates it altogether. 49 3 Investigating Die Performance and Die Design by Computational Tools The design of extrusion dies is based on the principles of rheology, thermodynamics, and heat transfer as described in the book by Natti Rao and Nick Schott, which is suggested for further reading, and listed along with the references at the end of this book.

1 Obtaining Better Melt Quality The performance of an extrusion screw employed in a process can be simulated by using the equations for the melting profile, stock temperature, and melt pressure given in [2], and if necessary, the screw design optimized for better performance by using the program TEMPMELT mentioned in Chapter 5. The results of a simulation are shown schematically in Fig. 11 [21]. The following practical examples illustrate this procedure. 3 shows the melting of a polymer in the screw channels of an extrusion screw.

9) where m& = output kg/h N = screw speed rpm D = screw diameter mm m& s = specific output The specific output, m s , is plotted as a function of the screw diameter D for LLDPE and LDPE in Fig. 6 by means of Eq. 5 from Eqs. 7. 6 Specific output, m·s for LDPE and LLDPE as a function of screw diameter for an extruder of L/D = 20 Other target values of practical interest are plotted in Figs. 9 as a function of screw diameter. Machine manufacturers confirmed the application of these easy-to-use relationships, although only one single value of the power law exponent is used to characterize the resin flow.

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