Know How - Extrusion

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Published: 4/25/2016

EXTRUSION: Finding the Sweet Spot
The compression ratio of a screw does not provide enough detail on how it will perform. Screw design is a balancing act that takes many variables into account.

Published: 3/24/2016

EXTRUSION: Barrel Heat and Melting
Barrel temperature may impact melting in the case of very small extruders running very slowly. Otherwise, melting is mainly the result of shear heating of the polymer.

Published: 2/22/2016

EXTRUSION: Understanding The Barrier Gap
All barrier screws are not created equal, and the barrier length and gap can be one of the reasons.

Published: 1/20/2016

EXTRUSION: Venerable Maddock Mixer Still an Extrusion Workhorse
Variations to this decades-old mixing section are widely used, but processors should carefully analyze these designs and not assume they will perform better.

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.