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Don’t Overlook the Feed Section
Most extrusion screw designers often do not design the feed section with the same rigor as other sections. This is odd since nothing goes through the screw that doesn’t first go through the feed section.
Columns Published: 11/26/2013
Regrind and Melt Pumps
Changing levels of regrind can result in unstable output. If not set up properly, a melt pump can add to this instability—the opposite of the intended effect.
Columns Published: 10/24/2013
‘General Purpose’ = No Purpose
Such screws have no value in extrusion operations.
Columns Published: 9/23/2013
The Scale-Up Conundrum
There are many methods used to determine scale-up based on output, but most designers do not scale the melting requirement along with the output.
Columns Published: 8/26/2013
Understanding Screw Breakage
You might think you're over-torquing the screw, but more often than not bending is the reason.
Columns Published: 7/29/2013
What About Melt Strength?
All extrusion processes depend to some degree on the melt strength of the polymer, and this property is generally a no-show on data sheets.
Columns Published: 5/28/2013
The Cause of Catastrophic Screw Wear
Erratic feeding can be the culprit. This is not uncommon when dealing with recycled material.
Columns Published: 4/29/2013