Introduction. Practical extrusion processes and their requirements. Flow behaviour relevant to extrusion. Thermal and energy properties in processing. Extrusion dies. Principles of melt flow in single-screw extruders. Solids conveying and melting in single-screw extruders. Principles of energy balance. Operation of single-screw extruders. Twin-screw extruders. Extruder operation as part of a total process. Practical extruder operation. Application to the individual machine. Appendices. References. Index.