Know How - Extrusion

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Published: 7/25/2017

The Importance of Proper Barrel Supports
Supports that allow the barrel to expand and contract easily will prevent alignment issues. Examine them periodically for proper operation, particularly if you’re experiencing excessive wear.

Published: 6/27/2017

Extrusion Cooling: It’s All About Turbulence
Regardless of what you are extruding, in order to maximize cooling you need to generate turbulence at the heat-exchange surface.

Published: 5/31/2017

Sharper Dies Make for Smoother Extrusions
Dies that have a radius at the exit will result in poorer surface finish.

Published: 4/25/2017

Sizing the Barrier Gap
Here’s a less complex way to properly size the barrier gap for barrier screws.

Published: 3/26/2017

How ‘Hydro Wedges’ Reduce Screw Wear
Using them only in the melting section provides for greater design freedom and negates the impact these devices can have on output and melt temperature.

Published: 2/25/2017

Extruding with Fillers
You can use the reference point from processing unfilled polymer to determine whether you can run filled resin on your current system.

Published: 1/26/2017

Don’t Build In Melt-Temperature Variations
It’s not unusual for polymer to exit the extruder with a uniform melt temperature, only to be fouled up by downstream flow pipes and the like. Here’s how to avoid this.

Published: 12/27/2016

Which Barrier Screw for You?
It depends ... mostly on the melting requirements of the polymer.

Published: 11/23/2016

What Output Can I Expect?
Processors ask screw designers this question a lot. But neither output nor melt temperature can be predicted without details on the polymer and head pressure.

Published: 10/18/2016

Extruding Very High-Flow Polymers
Screw designs not suited to process lower-viscosity materials will result in poor melt quality and lower outputs.