Know How - Extrusion

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Published: 10/27/2017

Extrusion: The Challenges of Extruding Highly Filled Polymers
These materials require screw changes and modifications in upstream and downstream equipment and operating procedures.

Published: 9/25/2017

Extrusion: The Role of Polymer Density in Screw Design
Density affects the mass flow rate, and energy transfer is based on mass, not volume. As a result, polymer density enters into practically every calculation in a screw design.

Published: 8/31/2017

Extrusion: The Facts About Barrel-Temperature Override
Cooling the barrel more may extract heat from the barrel, but not necessarily from the process. Here’s why.

Published: 7/25/2017

Extrusion: 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.