Co-Rotating Twin-Screw Extruders

Fundamentals, Technology, and Applications
Copyright: 2007
ISBN: 9781569904220
Hardcover: 354 pages
$199.99 (US)


Introduction. Historical Development of the Co-Rotating Twin Screw. Rheological Properties of Polymer Melts. General Overview of the Compounding Process:  Tasks, Selected Applications, and Process Zones. Geometry of the Co-Rotating Extruders:  Conveying and Kneading Elements. Modeling:  Possibilities and Limitations. Pressure Generations and Energy Input in the Melt. Computational Fluid Dynamics. Mixing and Dispersing: Principles. Degassing Polymer Melts with Co-Rotating Twin Screw Extruders. Simulation or Scale-Up — Alternatives for Extruder Layout? Screw Elements for Co-Rotating, Closely Intermeshing Twin-Screw Extruders. Overview of Patented Screw Elements. The ZSK Series and Applications in the Chemical Industry and for Renewable Raw Materials. ZSK-NT the New Two-Stage Processing System for High Throughputs. Material Selection for Twin-Screw Extruders Components in Contact with Resin. Drive Units for Co-Rotating Twin-Screw Extruders.


Co-rotating screws are used in many branches of industry for producing, preparing and/or processing highly viscous materials. They find a wide variety of applications especially in the plastics, rubber and food industries. Co-rotating twin-screw machines usually have modular configurations and are thus quite flexible for adapting to changing tasks and material properties. Well-founded knowledge of machines, processes and material behavior are required in order to design twin-screw extruder for economically successful operations. This book provides basic engineering knowledge regarding twin-screw machines; it lists the most important machine-technical requirements and provides examples based on actual practice. Better understanding of the processes is emphasized as this is a prerequisite for optimizing twin-screw designs and operating them efficiently. Besides basic functions, such as compounding, the book focuses on the historical development of twin-screws, the geometry of the screw elements (fundamentals, basic patents, patents overview), material properties and material behavior in the machine, fundamentals of feed behavior, pressure build-up and power input, examples of applications for various processing tasks, compounding: tasks, applications, processing zones, potential and limits of modeling, scaling-up various processes, and machine design including drives and materials.

Author Info:

Kohlgrüber, K.

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