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SCREW DESIGN BASICS - TAPPI

SCREW DESIGN BASICSThe Processor Point Of ViewAndrew W. ChristieOptex Process Solutions, Define the goal Review basic extruder components Discuss process elements Look at basic SCREW DESIGN features Put the components together Review process function optimization Discuss operator control and assessment Wrap Up What is the goal?Provide the melted polymer to the forming process at the desired rate, uniformity, and quality to produce the finished product within Goal: Thin films & coatingsScrew NomenclatureTRANSMETERMIXMETERFEEDS teps In The Process (Feeding to the extruder) Solids Conveying Melting Pumping MixingTake NoteThe single SCREW extruder is basically a volumetric pump. It is not a positive displacement device.

Single Screw Plasticating Extruders”, Conf. Proceedings, ANTEC 98, pp 136-141 . Rate is Solids Conveying • Output rate has a direct correlation to ... – Small Channel Width. Melt Separation Barrier. Melt Separation Barrier. Pumping • Driven by Drag Flow • …

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