Know-How
Troubleshooting Screw and Barrel Wear in Extrusion
Extruder screws and barrels will wear over time. If you are seeing a reduction in specific rate and higher discharge temperatures, wear is the likely culprit.
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The Importance of Hot Nozzle-Tip Mating Against a Cold Sprue Bushing
Done improperly, the result is a cold slug in the nozzle/sprue and a production stop. But there is a better way.
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Tracing the History of Polymeric Materials -- Part 29: Polyurethane
This material family has unparalleled versatility, not only in terms of the forms the material can take, but in the different ways in which it can be processed.
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Why Shoulder Bolts Are Too Important to Ignore (Part 2)
Follow these tips and tricks for a better design.
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Why Shoulder Bolts Are Too Important to Ignore (Part 1)
These humble but essential fasteners used in injection molds are known by various names and used for a number of purposes.
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Looking to Run PCR on a Single Screw? Here’s What to Keep in Mind
Just drop it in and mix it up? Sorry, there’s a lot more to it than that. Here is some of what you need to consider.
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Time to Swap Out Those General-Purpose Injection Nozzle Tips
Still the standard in the industry, GP nozzle tips can cause a myriad of problems for molders. There are alternatives out there that should be examined.
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How to Configure Your Twin-Screw Extruder -- Part 2
Follow these tips to configure your twin-screw elements to promote feeding and solids conveying.
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Tracing the History of Polymeric Materials, Part 28: Making LCP's Melt Processable
Liquid-crystal polymers based on a single monomer produces a polymer with a very high melting point.This presents two problems. Here’s how they were solved.
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The Effects of Time on Polymers
Last month we briefly discussed the influence of temperature on the mechanical properties of polymers and reviewed some of the structural considerations that govern these effects.
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