Extrusion Know How
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How To Identify Resin Degradation in Single-Screw Extruders
Degradation can occur in many single-screw extrusion operations, and typically occurs due to minor design flaws in the screw. Here is how to track it down.
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Optimizing Melt-Fed Single-Screw Extruders on Compounding Lines
The main problem with melt-fed extruders that are starve-fed is setting the depth of the metering channel. In this scenario, we describe how this problem was solved.
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What You Need to Know About Roll-Cooling Design
Cooling rolls might not look like high-tech machines, but the fact is there is a surprising amount of technology involved in their design, manufacture and use. Here’s what you need to know.
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What You Need to Know About Melt-Temperature Measurement in Single-Screw Extruders
Measuring the discharge temperature is not so simple, especially when using thermocouples positioned in the transfer line just upstream of the die.
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How to Select the Right Cooling Stack for Sheet
First, remember there is no universal cooling-roll stack. And be sure to take into account the specific heat of the polymer you are processing.
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What's Restricting My Output Rate?
In a single-screw extruder, it could be an improperly designed barrier flighted entry section. Here’s why.
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EXTRUSION: Melting 101
Learn the basics on how polymer melts in a single screw. Barrel temperature plays less of a role than you might think.
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How to Decrease the Extrudate Temperature in Single-Screw Extruders
In many cases, decreasing the discharge temperature will improve product quality and perhaps even boost rate. Here are ways to do it.
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Why Are There No 'Universal' Screws for All Polymers?
There’s a simple answer: Because all plastics are not the same.
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In Single Screw Extruders, Mixing Starts in the Melting Process
While the melting process does not provide perfect mixing, this study shows that mixing is indeed initiated during melting.
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Troubleshooting Flow Surging in Single-Screw Extruders
Surging can cause lower production rates, higher scrap rates, material degradation and higher labor costs. Here is a guide to troubleshooting this problem.
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Understanding the Incumbent Resin Effect
When you are looking to replace an existing resin with a new one, in trials sometimes the “incumbent” resin will cause gels and other defects. Here’s what to look for.
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Understanding Melting in Single-Screw Extruders
You can better visualize the melting process by “flipping” the observation point so the barrel appears to be turning clockwise around a stationary screw.
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