Extrusion Know How
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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Telltale Signs of Screw Wear
Determining the cause of wear is the first step in eliminating it.
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Extrusion: Head Pressure and Output Stability
Use drag- and pressure-flow equations to analyze fluctuating output.
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Extrusion: A Simple Way to Evaluate Your Screw Performance, Part 2
A hand-held calculator and some basic equations can help determine whether your screw is up to snuff.
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