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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Understanding & Troubleshooting Extrusion Seminar, 4 day Seminar
by Chris Rauwendaal

September 23 - 26, 2019

Lecture at Courtyard by Marriott York
2799 Concord Road
York, PA 17402
Phone: 717-840-7840

Labs at Graham Engineering
1203 Eden Road
York, PA 17402
Phone: 717-848-3755

Printable Outline and Scanable Registration Form We will send you an invoice and you can use the custom payment area on our home page to make a payment with a credit card or use a PO# and send us a check.  

Online Registration

  Registration Type  
Attendee Name
Company Name
Attendee Email
Attendee Phone


Courtyard by Marriott York
2799 Concord Road
York, PA 17402
Phone: 717-840-7840
Website: marriott.com/HARYK

TownePlace Suites by Marriott York
2789 Concord Road
York, PA 17402
Phone: 717-840-1180
Website: marriott.com/HARYT

About the Seminar

“Eliminate the art – work smart” With this seminar you can become the smartest extrusion person in your company and make your company a world-class producer.

What the attendees will learn

  • How to use a high-speed DAS (HS-DAS)
    • to analyze pressure and melt temperature variation in the extruder
    • to optimize the barrel temperature profile
    • to quantify extrusion process stability
  • How to obtain data on viscosity versus shear rate from a lab extruder
  • How to determine the melt fracture behavior of your polymer
  • How to measure melt temperature correctly
  • How to measure melt pressure correctly
  • How to perform QC on incoming raw material
  • How extruder screws and dies can be designed for optimum performance
  • How to make your manufacturing operation more cost effective
  • How to make sure you have the right extrusion equipment
  • How Industry 4.0 can be applied to extrusion operations

Who should attend

  • Extruder operators
  • Set-up technicians
  • Process engineers
  • Quality control personnel
  • Floor supervisors
  • Plant managers
  • Production managers
  • Technical service personnel
  • Extruder manufacturers
  • Maintenance personnel

Testimonial from previous Seminars

Cancellation Policy

Course Description
  • Day 1, Morning, Introduction and Hardware
    • Basic components
    • Review of terminology
  • * Hardware components of an extruder
    • Screw and barrel
    • Screw drive
    • Heating and cooling
    • Instrumentation & control
  • Day 1, Afternoon, Polymer properties
    • Melt flow properties
    • Thermal properties
    • Viscous heat generation
    • How to improve extrusion
  • Day 2, Morning, Functional aspects
    • Solids conveying
    • Plasticating
    • Melt conveying
    • Devolatilization
    • Mixing
  • Day 2, Afternoon, Screw Design
    • Standard extruder screw
    • Variations on std. screw
    • Mixing screws
    • Barrier screws
    • Multi-stage screws
  • Day 3, Morning, Twin screw extruders
    • Twin vs. single screw
    • Co-rotating twin screw
    • Counter-rotating twins
    • Co- versus counter-rotating
    • Non-intermeshing twins
  • * Die Design
    • Rules and guidelines
    • Analysis of dies
    • Die flow problems
      • Die drool
      • Melt fracture
      • Concentricity
      • Die lines
    • Tubing and pipe dies
    • Sheet and film dies
    • Profile dies
    • Wire coating dies
    • Coextrusion dies
Course Description (continued)
  • Day 3, Afternoon, Troubleshooting
    • Methodology
    • Requirements for troubleshooting
      • Instrumentation and DAS
      • Condition of equipment
      • Information on feedstock
    • Importance of data acquisition
    • Common mistakes in companies
    • Machine related problems
      • Wear
      • Poor screw design
      • Poor die design
  • Day 4, Morning, Troubleshooting cont'd
    • Functional problems
      • Conveying
      • Melting
      • Mixing
    • Polymer degradation
      • Types of degradation
      • Solving degradation problems
    • Extrusion instabilities
    • Mechanics of surging
    • Fast Fourier Transform analysis
    • Melt fracture and shark skin
  • Day 4, Afternoon, Troubleshooting cont'd
    • Gel problems
      • Gels formed in polymerization
      • Gels formed in the extruder
      • How to eliminate gels
    • Air entrapment
    • Shrink voids
    • Optimizing barrel temperatures
    • Practical examples/case studies
      • Wear problems
      • Surging
      • Degradation, etc.

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 over 40 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, 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