KNOW-HOW - EXTRUSION

PET Processing - Extrusion

EXTRUSION: Orientation: The Good and the Bad

Depending on what you are trying to accomplish, molecular orientation can have a positive or negative impact on your part. Here’s how to control it.
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Extrusion

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.
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Extrusion Know How

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.
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Extrusion

EXTRUSION: Finding the Sweet Spot in Screw Design

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.
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Extrusion

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.
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Extrusion

EXTRUSION: Understanding The Barrier Gap

All barrier screws are not created equal, and the barrier length and gap can be one of the reasons.
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Extrusion Know How

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.
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Extrusion

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.
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Extrusion Know How

EXTRUSION: The Two Main Causes of Screw Wear

Wedging and misalignment are often confused with each other when inspecting a worn screw.
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Extrusion

EXTRUSION: Pellet Geometry Can Impact Output

A simple angle-of-repose experiment can help you determine how your pellets will feed.
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