On-Demand Webinar:

Plastics & Plastics Fabrication

Date: October 6, 2010
Time: 3 PM EDT (12 PM PDT)
Duration: 1 hour


An overview of twin screw extrusion theory and design for high-speed high-energy input twin screws extruders will preface a review of recent advancements for co-rotating and counter-rotating geometries. Included will be a review of a new shaft design that facilitates a larger OD/ID ratio with increased torque. Test results for various products will compare the improved twin screw extruder to previous designs. Staging of unit operations and how to operate the equipment will be also be presented, as will detailed comparisons of various feed rates vs. screw rpms to achieve the desired mixing level intensity and residence time distribution. Other topics addressed: upstream material handling and feeding system design, as well as downstream system integration to make pellets or parts; selecting the proper feed system for solids and/or liquids; design and application of various types of pelletizing systems; plus the integration of a gear pump and downstream system to directly extrude a film, sheet, fiber or profile.

Key Take-Aways

  • Learn how twin screw extruders work for mass transfer operations, i.e. mixing or de-volatilization
  • Appreciate the importance of upstream and downstream system design
  • Review advances in twin screw designs for increased torque, volume, and heat transfer


Charles Martin, General Manager, American Leistritz Extruder Corporation

As General Manager of American Leistritz Extruder Corporation, Charles Martin is responsible for the Leistritz product line of twin screw extruders and systems in North America. Martin has given presentations at more than 100 worldwide events in his career, and is the author of numerous technical articles and papers on the subject of extrusion technology. Martin sits on the Board of Directors for both the Society of Plastics Engineers (SPE) Extrusion Division and the Polymer Processing Institute. He earned his undergraduate degree from Gettysburg College and his MBA from Rutgers University.

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