The author presents single-screw extrusion technology together with the relevant polymer fundamentals, with an emphasis on screw design. The presentation begins on a physical level, providing an in-depth conceptual understanding, followed by an analytical level with mathematical models. Practical applications of the mathematical models are illustrated by numerous examples. A brief description of twin-screw extrusion technology is also presented. New in the third edition: a novel patented barrier screw design that eliminates shortcomings of all previous barrier screw designs, more descriptive specific screw design guidelines, a scientifically designed pineapple mixing section, and general improvements and corrections. Contents: ⢠Physical Description of Single-Screw Extrusion ⢠Fundamentals of Polymers and Melt Rheology ⢠Theories of Single-Screw Extrusion and Scale-Up ⢠Screw Design and High Performance Screws ⢠Gear Pumps, Static Mixers, and Dynamic Mixers ⢠Die Design ⢠Viscoelastic Effects in Melt Flow ⢠Special Single-Screw Extruder with Channeled Barrel ⢠Physical Description of Twin-Screw Extruders