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Understanding & Optimizing Extrusion Seminar, 2 day Seminar
(scroll down for complete outline and description)
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About the Seminar
The purpose of this seminar is to develop a thorough understanding of the extrusion process and the ability to apply it to solve actual extrusion problems. The extrusion process will be broken down into discrete functional zones: solids conveying, melting, melt conveying, mixing, and degassing. The different functional zones will be discussed in detail with an emphasis on the mechanisms at work in each zone. After establishing the engineering principles of extrusion, practical applications of these principles to screw design, die design, and troubleshooting will be discussed in detail. Attendees are encouraged to ask questions and discuss actual extrusion problems. Advanced tools for analysis, design, and troubleshooting will be discussed and demonstrated in the class. Dr. Chris Rauwendaal’s book "Understanding Extrusion" is available at a discount with seminar registration.
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Course Description
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Introduction
• Basic components of an extruder
• Review of terminology
Hardware components of an extruder
• Screw, barrel, and feed system
• Grooved feed extruders
• Screw drive systems
• Breaker plate and screens
• Gear pumps
• Heating and cooling
• Instrumentation and control
Polymer properties important in extrusion
• Melt flow properties
• How to determine flow
properties directly
from the extruder
• Thermal properties
• Viscous heat generation
• How polymer properties can
be used to set
correct processing condition and improve
the extrusion process
Functional aspects
• Solids conveying
* Gravity induced conveying
* Drag induced conveying
* How to improve solids conveying
• Plasticating or melting
* Contiguous solids melting
* Dispersed solids melting
* How to improve melting
• Melt conveying
* Drag flow
* Pressure flow
* Leakage flow
• Devolatilization or degassing
• Mixing
* Basic mechanism of mixing
* Distributive mixing
* Dispersive mixing
* How to improve mixing |
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Screw design
• Standard extruder screw
• Variations on standard screw
• Mixing screws
• Barrier type screws
• Multi-stage screws for venting
• How to improve performance by
optimizing screw geometry
Die Design
• General rules and guidelines
• Analysis of dies
• Die flow instabilities
• Sheet and flat film dies
• Tubing and pipe dies
• Profile dies
• Coextrusion dies
Twin Screw Extruders
• Twin vs. single screw extruder
• Co-rotating twin screw extruders
• Counter-rotating twin screw extruders
• Co- versus counter-rotating extruders
• Non-intermeshing extruders
“ Understanding Extrusion ” (UE) by Chris Rauwendaal is available at a discounted price of $60.00 when signing up for one of these seminars.
Books authored by Chris Rauwendaal:
- Understanding Extrusion
- Polymer Extrusion
- Troubleshooting the Extrusion Process
- SPC in Injection Molding and Extrusion
- Polymer Mixing
- Mixing in Polymer Processing
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About the Instructor:
Dr. Chris Rauwendaal has been a top seminar instructor for more than 25 years. He has taught with SPE, UWM & UC Berkeley & teaches many in-house courses. He is a well known plastics author. Chris has 30+ years experience in the plastics industry. His experience is in a wide range of extrusion operations, including fiber spinning, film, sheet, tubing, medical tubing & profile extrusion, coextrusion, and reactive extrusion. He has worked on both practical and theoretical problems such as screw & die design, troubleshooting, modeling and computer simulation, material analysis, failure analysis, etc. Chris has authored 6 books on extrusion and related fields.
Since 1990 he has been President of Rauwendaal Extrusion Engineering, Inc., a company that provides custom extruder screws and other extrusion hardware, training programs, engineering & expert witness services to the plastic industry. With screw design as his specialty, over the past 5 years REE had developed patented technologies in the following areas:
• Elongational Mixing Devices
• Mixing non-return valves
• Single screw compounding extruder
• Cooling screws for foam extrusion
For registration contact: sietske@rauwendaal.com
For seminar content contact: chris@rauwendaal.com
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