Exploring the: Extrusion Zone
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- What About Melt Strength?
- All extrusion processes depend to some degree on the melt strength of the polymer, and this property is generally a no-show on data sheets.
Columns Published: 5/28/2013
- 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
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