Extrusion Know How
Extrusion: Important Polymer Melting Equations for Extrusion Processors
The more you know about what happens in a screw, the more you’ll be able to work with your supplier to optimize design.
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Try This Lower-Cost Purging Method
You might be able to reduce purging times and save money by scheduling processing jobs in order of the increasing material viscosity. But to get started, you'll need shear rate/viscosity curves for your polymers.
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How to Optimize Usage of Recycled Material
Processors need to “engineer” feeding properties similar to virgin pellets into their regrind to efficiently and economically utilize more of their scrap.
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What You Need to Know to Get into Coextrusion
Key considerations range from determining the right extruder sizes to tooling, matching material viscosities, and lots more. Take a look.
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Try This Approach to Clean Up Your Recycled Material
CO2 can be used as a totally “green” solvent to remove many kinds of contamination in recycled plastics without the need for toxic solvents.
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Understanding Viscosity in Extrusion
Both the power-law coefficient and the consistency index must be considered to calculate viscosity.
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Barrier Screws: Not All Are Created Equal
Let’s take a deep dive into parallel and crossing types and see where each fit in.
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Why Barrel Temperatures Have a Small Effect on Melt Temperature
Extruders are not like ovens. Tweaking barrel-temperature profiles will not influence melt temperature all that much. Here’s why.
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Simple Scale-Up Calculations for Melting
You can avoid complicated melting equations when designing or evaluating a screw by using simpler methods that can save time and provide good results.
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Unraveling the Complexity of Single-Screw Scale-Up
Variables such as shear rates, melting rate, residence time and conductive heating are all influenced in the scale-up.
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