Exploring the: Extrusion Zone



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The Cause of Catastrophic Screw Wear
Erratic feeding can be the culprit. This is not uncommon when dealing with recycled material.
Columns Published: 4/29/2013
The Limits Of Compression Ratio
Don't rely just on this value during the screw design process.
Columns Published: 3/25/2013
Cooling Tips for Crystalline Polymers
If a little cooling is good, is a lot of cooling better?
Columns Published: 2/26/2013
The Evolving Barrier Screw
There has been a gradual transition from the earlier Maillefer designs used in Europe to the Dray/Lawrence design using the parallel barrier design with an increased helix angle to accommodate wider channels.
Columns Published: 1/28/2013
Why I Still Like Analog Meters
They may not look as slick as their digital cousins, but I find them more helpful in identifying and troubleshooting extrusion problems.
Columns Published: 12/28/2012
Screw Design Is a Matter of Balance
In order to achieve a balance between feeding, melting, and pumping it’s necessary to use proven calculations and/or tested empirical data in the design of each section.
Columns Published: 11/28/2012
What Output Should You Expect?
You can get a rough estimate of the potential output if you know the drive horsepower of your machine and the thermal characteristics of one of the materials you’ll be running.
Columns Published: 10/26/2012
PBT & PET Polyester: Part 2 The Performance Factor
All things being equal, PET will outperform PBT mechanically and thermally. But the processor must dry the material properly and must understand the importance of mold temperature in achieving a degree of crystallinity that allows the natural advant...
Columns Published: 10/26/2012
New Frontier for Single Screw R&D: Mixing & Melting by Extensional Shear
Extensional shear generally has been associated only with twin-screw extruders. However, I am now convinced it can be done with a single moving force (screw) by changing the geometry of the flow field perpendicular to the direction of flow.
Columns Published: 9/29/2012
The Power-Law Coefficient
By referring to the power-law coefficient, the effect of barrel override in the metering section of many screws can be explained and anticipated.
Columns Published: 8/27/2012

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