Know How - Extrusion

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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.

Published: 6/22/2016

EXTRUSION: Better Mix In Means Better Mix Out
Segregation or de-mixing of polymers and additives can be a big problem in single-screw extrusion. Here’s why it happens, and how to fix it.

Published: 5/26/2016

EXTRUSION: How Slow Can You Go?
Larger screws designed for high outputs will generate a variety of problems if run too slowly. Here’s why.

Published: 4/25/2016

EXTRUSION: Finding the Sweet Spot
The compression ratio of a screw does not provide enough detail on how it will perform. Screw design is a balancing act that takes many variables into account.