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Principles of Single Screw Extrusion
Principles of Single Screw Extrusion
Fee: $1,095
Instructors: Dr. Eldridge M. Mount
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WHO SHOULD ATTEND:
This two-and-one-half-day seminar will be targeted for engineers, managers, and extrusion practitioners who want a fuller appreciation and knowledge of the inner workings of single screw extruders. The seminar will use algebraic formulas developed from the engineering analysis of extrusion mechanisms to obtain a physical interpretation of the developed extrusion theory and what controls an extruder's performance. The formulas will also be used to make basic feeding, melting, and metering calculations for comparison with experimental performance characterization results.
EDUCATIONAL GOALS:
This seminar will be an intensive introduction to the science and engineering of single screw extruders. The focus will be on describing the component parts of extruders and their purpose. It will also focus on describing the principal mechanisms of solids conveying, melting, metering, and mixing performed by extruder screws. A review of basic rheological principles will also allow for an introductory discussion on die design principles. Having developed an appreciation for how an extruder works from a mechanistic point of view, participants will learn effective troubleshooting techniques to improve real-world problem solving. Extruder performance measurement techniques and procedures will be described, as well as the use of the information for improvements in output, determination of a worn screw, drive sizing, etc. A review of existing screw designs, basic screw principles, and scale-up will help in the future specification and characterization of new screw technology.
SEMINAR OUTLINE:
1. Polymer and Rheology Review
* Bulk density of polymers
* Frictional properties
* Thermal properties and property transitions
* Rheological behavior of polymer melts
* Mechanisms of degradation
2. Extruder Components
* Drive characteristics
* Gear box
* Screw and barrel
* Instrumentation
* Wear and materials of construction
3. Extrusion Fundamentals
* Extrusion overview
* Feeding
* Solids conveying
* Melting and plasticating
* Metering
* Mixing
* Scale-up
* Principal extrusion calculations
4. Screw Design Principles
* Standard screw designs
* Barrier screw designs
* High-performance screw designs
* New screw specification
* Screw design principles
* Scale-up
5. Characterization of Extruder Performance
* Key independent variables
* Primary dependent variables
* Conducting the test
* Evaluating the results
* Comparison with extrusion calculations
6. Troubleshooting the Extrusion Process
* Describing poor performance
* Locating the upset
* Defining corrective actions
* Design specifications for the next screw
7. Die Design Principles
* Blown film dies
* Sheet dies
* Co-extrusion feed blocks and multicavity dies
