Know How - Extrusion

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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 in Screw Design
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.

Published: 3/24/2016

EXTRUSION: Barrel Heat and Melting
Barrel temperature may impact melting in the case of very small extruders running very slowly. Otherwise, melting is mainly the result of shear heating of the polymer.

Published: 2/22/2016

EXTRUSION: Understanding The Barrier Gap
All barrier screws are not created equal, and the barrier length and gap can be one of the reasons.