Know-How
A Processor's Most Important Job, Part 9: Avoid Molded-In Stress
How to establish molding conditions that minimize internal stress in a part.
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Tooling: Why Ejector Pins Break And How to Prevent It, Part 2
Here’s the when and how to reduce the unsupported length of pins.
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Injection Molding: Is There a ‘Most-Important’ Process Parameter?
A case can be made for multiple variables—fill balance, fill time, injection pressure, cavity pressure—as most important. But there is something else altogether that is essential to successful injection molding.
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A Processor’s Most Important Job, Part 8: Molded-In Stress
How processing adjustments can control molded-in stress.
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Tooling: Why Ejector Pins Break...and How to Prevent It, Part 1
In part one of this four-part series, we focus on the molding machine and the ejection system as culprits.
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Injection Molding: Fill Based on Volume, Not Weight
Most parts should be 90-99% full after first-stage—by volume not weight. Here’s why that’s important and how to make a first-stage-only part.
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A Processor's Most Important Job, Part 7: Reviewing Crystallinity
There are several process-related issues that influence crystallinity besides cooling rate. Let’s examine a few.
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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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Injection Molding: Safety First—Know the Compatibility of Different Resins
Certain materials don’t play well together when mixed. So it’s best not to. Here are some guidelines.
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Tooling: Clamp Pressure & Cavity Land Area, Part 2
What you need to know to prevent flashing and mold damage.
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