Rauwendaal Extrusion engineering, Inc.
Rauwendaal Extrusion Engineering, Inc. 530.269.1082

A Polymer Process Engineering & Training Company Home of the CRD Mixing Screws

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Advanced Extrusion Seminar, 2 day Seminar

May 6-7, 2013
Sheraton Sand Key Resort
Clearwater Beach, FL
Phone: 727-595-1611

by Chris Rauwendaal

Printable Outline

About the Seminar
The seminar covers extrusion theory and teaches how theory can be applied to solve real extrusion problems and to optimize the process.  Equipment issues and polymer properties will be covered.  Extruder functions and quantitative analysis will be discussed in detail.  This will be applied to screw and die design and to troubleshooting.  Attendees will learn to calculate solids conveying rate, melting rate, pumping rate, diehead pressure, onset of melt fracture, temperature by viscous dissipation, etc.  Attendees will be expected to answer a number of homework questions between the first and second day.  These questions will be discussed the second day.

Who Should Attend this Seminar

This is designed for technical personnel who want to develop a better understanding of extrusion and learn to perform quantitative analyses and calculations.  People that teach extrusion within their company will benefit from this seminar.  Technical service personnel will be better equipped to advice customers and solve extrusion problems.  This seminar is not recommended for people without an engineering degree.

Advanced Extrusion Seminar Testimonials

Seminar Hours, Cancellation Policy, Location and Accomodations

Course Description

Hardware components of an extruder

  • Main components
  • Screw and barrel
  • Feed hopper and feed housing
  • Grooved Feed vs smooth bore
  • Breaker plate and screen pack
  • Motor and reducer
  • Heating and cooling
  • Instrumentation and control
  • Melt temperature
  • Melt pressure
  • Other important parameters
  • Pressure feedback control
  • Temperature control
  • Data acquisition systems

Polymer properties

  • Melt flow properties
  • How to measure melt flow properties
  • How to interpret melt flow data
  • Thermal properties
  • How to measure thermal properties
  • How to interpret thermal data
  • How properties affect extrusion
  • Viscosity data directly from an extruder

Functional analysis of extrusion process

  • Solids conveying,
  • Flood feeding vs. starve feeding
  • Melting: contiguous vs. dispersed solids
  • Melt conveying, effect of shear thinning
  • Mixing, distributive vs. dispersive
Course Description (continued)

*Screw design

  • Standard extruder screw
  • Mixing screws, engineering analysis
  • Multi-stage screws for venting
  • Computer aided screw design
  • Barrier type extruder screws
  • Screw manufacturing

Troubleshooting extruders

  • Requirements and methodology
  • Machine related problems

                  Poor screw design
                  Poor die design

  • Material related problems



  • Functional problems
  • Conveying
  • Melting
  • Mixing
  • Computer based troubleshooting
  • Practical examples and case studies


Die Design

  • General rules and guidelines
  • Methods of die flow balancing
  • Various types of extrusion dies

                  Sheet and flat film dies

                  Blown film dies

                  Pipe and tubing dies

                  Profile dies

  • Analysis of dies
  • Case study of die design
  • Computer aided die design
  • Die flow instabilities
  • Coextrusion dies



Books authored by Chris Rauwendaal:

About the Instructor:
Dr. Chris Rauwendaal has been a top seminar instructor for more than 30 years. He has taught with SPE, UWM & UC Berkeley & teaches many in-house courses. He is a well known plastics author. Chris has 35+ 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: chris@rauwendaal.com
For seminar content contact: chris@rauwendaal.com