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.
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.
Larger screws designed for high outputs will generate a variety of problems if run too slowly. Here’s why.
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.
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.
All barrier screws are not created equal, and the barrier length and gap can be one of the reasons.
Variations to this decades-old mixing section are widely used, but processors should carefully analyze these designs and not assume they will perform better.
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.
Wedging and misalignment are often confused with each other when inspecting a worn screw.
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A simple angle-of-repose experiment can help you determine how your pellets will feed.