Know-How
Understanding Strain-Rate Sensitivity In Polymers
Material behavior is fundamentally determined by the equivalence of time and temperature. But that principle tends to be lost on processors and designers. Here’s some guidance.
Read MoreCreating a Capable Process Using Process Capability
Know your Cp from your Cpk and how parts can meet dimensional specifications but still not be “capable.”
Read MoreExtruding PCR? Consider a Vented Extruder
You’ll need two-stage screws to extract volatiles that post-consumer reclaim will likely contain. Screw design can be a complex balancing act. Here’s what you need to know.
Read MoreTracing the History of Polymeric Materials: Aliphatic Polyketone
Aliphatic polyketone is a material that gets little attention but is similar in chemistry to nylons, polyesters and acetals.
Read MoreCooling Geometry and the Reynolds Calculation
The original Turbulent Flow Rate Calculator worked well with a round circuit diameter, such as a drilled passage, but not as well using hydraulic diameters. Here’s how the problem was fixed.
Read MoreMolders’ Block: Dealing With Foreign Materials in a Hot-Runner System
Understanding plastic flow can help you understand how foreign materials move—or don’t move—through your hot-runner system.
Read MoreTracing the History of Polymeric Materials: Acetal
The road from discovery in the lab to commercial viability can be long, and this was certainly the case for acetal polymers.
Read MoreWhat You Need to Know About Leader Pins and Bushings
There’s a lot more to these humble but essential mold components than you might suspect. Following the author’s tips could save much time, money and frustration.
Read MoreThe Importance of Viscosity in Melting
The calculations required to determine the right melt temperature for each polymer are complicated. Knowing the power-law coefficient and the consistency index of the polymer you run might prove useful.
Read MoreTracing the History of Polymeric Materials: The Differences Between Nylons & Polyesters
In many respects, nylons and polyesters appear to be interchangeable. But there are interesting differences in the properties of these two families that arise from their chemical structures.
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