The extrusion die is one of the most critical elements of an extrusion system. However, very few books have been devoted exclusively to die design. This book will combine a thorough engineering approach to die design with a practical, hands-on approach. The authors together have over sixty years of experience in extrusion and die design. They have been involved in all aspects of die design: polymer rheology, analysis of flow, layout of extrusion dies, testing of new extrusion dies, troubleshooting die related problems, maintenance of extrusion dies, etc.