Know How - Extrusion

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Published: 12/27/2011

The Melting Precision of Barrier Screws
These types of screws offer more melt uniformity.

Published: 11/28/2011

Extrusion: How Much L/D Do You Really Need?
Just like selecting the extruder size and drive combination, the L/D should be carefully evaluated.

Published: 10/25/2011

How Fillers Impact Extrusion Processing
Their addition can significantly change the processing properties of a polymer.

Published: 9/30/2011

Benchmark Your Extruders For Quicker Processing Fixes
Not recognizing output reductions and resolving them quickly can cost a lot of money. Benchmarking your machines will help.

Published: 8/23/2011

The Truth About Barrel Heating
The main purposes of the heaters are to melt the polymer that remains in the barrel at cold startup, to assist in forming the initial melt, and to “trim” the barrel temperatures for specific purposes such as improving feed rate.

Published: 7/27/2011

Where Does Shear Heating Occur? Here’s How to Find Out
One of the least understood yet most important concepts is viscous dissipation, which is the shearing or stretching of the polymer between the rotating screw and stationary barrel, causing heat to develop in the material.

Published: 6/27/2011

Dead Screw Talking
There's a lot you can learn by conducting a post-mortum examination of your screw.

Published: 5/31/2011

Screw Surging, Part III: Unfilled Discharge Section
This type of surge happens most frequently with two-stage screws when the second stage has far more capacity than the first stage. It can also happen when a screw is limited in feeding or melting, causing a partially filled metering section.

Published: 4/25/2011

Overfeeding Can Cause Surges, Too
Surging can be caused by feed restrictions, as covered in another column, and also by over-feeding or under-melting, discussed here.

Published: 3/26/2011

Solving Feed-Related Surging
Understanding the causes of surging can help troubleshoot and correct it.