Know How - Extrusion

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Published: 12/21/2015

EXTRUSION: Managing Regrind
Reusing scrap is a necessary evil. But be aware of the negative impact scrap has on properties and extrusion efficiencies. Start by developing a regrind-usage program.

Published: 11/23/2015

EXTRUSION: Melting 101
Learn the basics on how polymer melts in a single screw. Barrel temperature plays less of a role than you might think.

Published: 10/26/2015

EXTRUSION: The Two Main Causes of Screw Wear
Wedging and misalignment are often confused with each other when inspecting a worn screw.

Published: 9/25/2015

EXTRUSION: Pellet Geometry Can Impact Output
A simple angle-of-repose experiment can help you determine how your pellets will feed.

Published: 8/17/2015

EXTRUSION: Barrier Screws and Mixers
For some reason, there are a lot of barrier screws in operation with high-shear mixers, when a distributive mixer is usually a better choice.

Published: 7/16/2015

EXTRUSION: How to Adjust for Shrinkage and Orientation
Polymers shrink and orient. Sometimes orientation is unbalanced, resulting in misshaped parts. But there are steps beyond tweaking the die that can mitigate these effects.

Published: 7/1/2015

EXTRUSION: Another Technique for Controlling Melt Temperature
Flight widths are almost always designed at 10% of the screw diameter. But they can be optimized to reduce melt temperature and perhaps boost output.

Published: 5/25/2015

EXTRUSION: Cooling: The Critical Function in Extrusion
Figuring out how much cooling your process needs is complicated. But there are ways to approximate.

Published: 4/27/2015

EXTRUSION: Here’s Why You Shouldn’t Run Your Extruders Dry
At least not for longer than a few minutes. The thin film that’s captured between the screw flights and barrel wall supports the screw and acts as a lubricant. Without it, galling can occur.

Published: 3/31/2015

Extrusion: What’s the Best Way to Vent?
There are advantages and disadvantages to each, and they must be evaluated before making a decision.