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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Troubleshooting Blown Film Extrusion Operations Seminar, 2 day Seminar

May 15-16, 2014
Sheraton Sand Key Resort
Clearwater Beach, FL
Phone: 727-595-1611

by Chris Rauwendaal and Paul Waller

Printable Outline

About the Seminar

This seminar presents an in-depth discussion of Troubleshooting the Blown Film Process.
The objectives of this seminar are for students:

Two recognized experts will be the instructors for the seminar.

What the attendees will learn:

Who should attend:

Testimonial from previous Seminars

Course Description

Day 1, Chris Rauwendaal

1.  Introduction & extruder hardware

• Basic extruder components

• Review of terminology

• Screw and barrel

• Feed system

• Screw drive

• Heating and cooling

• Instrumentation and control

2. Plastic properties

• What are plastics?

• Plastics used in extrusion

• Melt flow properties

• Thermal properties

• Viscous heat generation

• Plastic quality control

3. Inside the extruder

• Feeding

• Solids conveying

• Plasticating

• Melt conveying and mixing

4. Extruder screws

• Standard extruder screw

• Variations on standard screw

• Mixing screws

• Barrier type extruder screws

5. Blown film dies

• Side fed dies

• Bottom fed dies

• Spiral mandrel dies

• Coextrusion dies

• Oscillating dies

6. Operational principles

• Startup procedures

• Purging and changeover

Shut down procedures

Books authored by Chris Rauwendaal:

The following books are discounted when you register for a seminar.  If you want to order check appropriate box on registration form.

  • Polymer Extrusion
  • Understanding Extrusion
  • Troubleshooting the Extrusion Process
  • SPC in Injection Molding and Extrusion
  • Polymer Mixing
  • Mixing in Polymer Processing



Course Description (continued)

Day 2, Paul Waller


7. Downstream equipment

• Comparison air ring systems

• Optimizing air ring setup

• Internal bubble cooling systems

• Automatic gauge control

• Bubble stabilizer systems

• Effect collapsing systems on gauge

  variation and roll geometry

• Surface treatment and limitations

• Web tension control and optimization

• Heat sealing and bag manufacturing

8.  Troubleshooting

• Requirements for efficient troubleshooting

• Tools for troubleshooting

• Systematic troubleshooting

• Polymer degradation

• Extrusion instabilities

• Bubble instabilities

• Air entrapment and gel problems

• Die lines

• Poor optical properties

• Extrusion instabilities

• Wear problems

• Interfacial instabilities

9. Workshops

• Eliminate melt fracture

• Eliminate interfacial instability

• Eliminate gels

• Control bubble instability

• Diagnose surface adhesion problems

• Diagnose and eliminate wrinkles

• Optimize heat seal strength

• Diagnose and minimize gauge variation

• Extruder temperature profiles

• Diagnose and eliminate extruder surging

• How to adjust for screw and barrel wear


Click on the image to find a description of the book.

This book normally $149.00 is available with seminar registration for $125.00


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: chris@rauwendaal.com
For seminar content contact: chris@rauwendaal.com