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EXTRUSION: Better Mix In Means Better Mix Out
Segregation or de-mixing of polymers and additives can be a big problem in single-screw extrusion. Here’s why it happens, and how to fix it.
Columns Published: 6/22/2016
EXTRUSION: How Slow Can You Go?
Larger screws designed for high outputs will generate a variety of problems if run too slowly. Here’s why.
Columns Published: 5/26/2016
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.
Columns Published: 4/25/2016
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.
Columns Published: 3/24/2016
EXTRUSION: Understanding The Barrier Gap
All barrier screws are not created equal, and the barrier length and gap can be one of the reasons.
Columns Published: 2/22/2016
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.
Columns Published: 1/20/2016
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.
Columns Published: 12/21/2015