Know How - Extrusion

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Published: 5/29/2012

What’s the Deal With High-Speed Extruders?
If we are talking about extruder screw speed, how about 1800 rpm? That’s how fast some extruders are running today.

Published: 4/26/2012

Salt and Screw Cooling
With both, watch how much you use.

Published: 3/26/2012

Water, Oil, Air, or None?
There is no one 'best' barrel cooling medium, but there seems to be a shift in the industry toward air cooling.

Published: 2/21/2012

Well, It Worked on Brand X
You need to give your designer a lot more data than that to make sure you get a screw that's right for you.

Published: 1/28/2012

‘Wedging’ Can Cause Severe Screw Wear
In a column I wrote for the July 2011 issue, I discussed the value of conducting “forensic” examination of worn screws when they are removed for clues to design flaws.

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.