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EXTRUDER TECH, INC.
"Designing and operating plastic extruder machines requires a special skill that combines physics, mathematics, experience and art. Extruder Tech is dedicated to promoting and advancing that skill. " Stephen J. Derezinski, Ph.D., President of Extruder Tech, Inc.
Specializing in flow stability of single screw extruder systems
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S. Derezinski, May 18, 2006
This paper is available at www.spexdiv.com/potmmay2011.pdf
Slides of the presentation are available at www.spexdiv.com/ANTECSlides2011.pdf
Lab service available for lateral stress measurments.
E-mail: steve@extrudertech.com
The tandem screw extruder uses two screws and two drives in a common barrel. The two drives are driven from opposite ends of the barrel. The first drive powers a solids conveying screw, and the second drive powers a smooth rotor. The first drive solely controls the rate, and the second drive solely controls the melt temperature. Excellent temperature uniformity and response are obtained, as well as many other advantages. Download slides from ANTEC presentation of "The Tandem Screw Extruder."
Kinematics of Solids Conveying is a method for understanding and modeling solids conveying that does not rely on the use of friction factors. Instead, the solids conveying angle is defined and used as a single constitutive parameter that combines the effects of barrel and screw friction.
Dr. Derezinski received the Bruce Maddock Award at the Society of Plastic Engineers Annual Technical Conference (ANTEC 2007) on May 8 in Cincinnatti, Ohio.
The Bruce Maddock Award is given by the Society's Extrusion Division to individuals for significant contributions to the field of single screw extrusion.
Every extruder must perform two basic functions.
RHEOLOGY MEASUREMENTS
Click on References and Software for information on getting quality rheological measurements for your polymers. This is most key to accurate extruder analysis and screw design.
"Kinematics Model of Solids Conveying of LDPE with a Grooved Barrel," The model is based on previous work using the solids conveying angle instead of friction factors as the constitutive factor for the calculations. This makes the method very powerful since friction factors are difficult to define for a grooved barrel system.
Slides with Notes for "Kinematics Model of Solids Conveying of LDPE with a Grooved Barrel."
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Post questions at large about extrusion. You can also read up on selected topics of recent discussion. There often are some very practical issues discussed.
I received my Ph.D. in mechanical engineering in 1972 from the University of Michigan, where I did my research in computer simulation of fluid mechanics. I then spent 30 years in process research and development with Eastman Kodak Company, where I specialized in single screw extrusion and sheet film manufacture.
I have authored numerous papers on plastic processing and extrusion with The Society of Plastic Engineers, and I have a number of patents in extrusion and film manufacturing.
I was also the Technical Program Chair for the Extrusion Division at the Society Plastic Engineers for ANTEC 2003. I also served as Division Chair in 2004, and I am currently on the Extrusion Division Board of Directors.
