Practical extrusion processes and their requirements

Abstract

This chapter makes a brief survey of the common applications of screw extruders. It also attempts an explanation of why the requirements of these applications differ, at least in degree, so that when the implications of the general theory in Chapters 5–10 are applied to practice in Chapter 11, it is clear why different materials, processes and products may require different operational and control strategies. These requirements must necessarily be stated in qualitative terms, and users will no doubt be able to give examples where practice appears to contradict statements made here; the author’s hope is that the deductions in later chapters will be helpful in the majority of cases and in the remainder will provide a guide to the correct methods and criteria, based on sound analysis.