Know How - Extrusion

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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.

Published: 9/27/2016

Do You Have Screw Wear?
It’s generally caused by metal-to-metal contact, and your first indicator will be poor melt quality.

Published: 8/24/2016

EXTRUSION: Is Head Pressure Sapping Your Extruder’s Strength?
A redesign of all of the flow paths between the end of the barrel and die may be in order.

Published: 7/29/2016

EXTRUSION: Orientation: The Good and the Bad
Depending on what you are trying to accomplish, molecular orientation can have a positive or negative impact on your part. Here’s how to control it.