Know-How
Tracing the History of Polymeric Materials -- Part 30: Polyurethane
In the world of polymers, polyurethane chemistry is probably the most versatile. This a resulted in a wide range of products made from these materials and given the industry the flexibility to respond to the progressive march of regulatory concerns.
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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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