Know-How
Two-Shot Molding and Tool Design
There are a few variations of the two-shot molding process, and each has implications for tool design.
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Extruding Very High-Flow Polymers
Screw designs not suited to process lower-viscosity materials will result in poor melt quality and lower outputs.
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Faster Is Not Always Better—Optimize Your Molding Cycle
It is possible for machines to run too fast, so find the sweet spot where maximum output overlaps with good parts.
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The Importance of Oxidative Stability in Polyolefins, Part 3
Tools and methods for determining oxidative stability can be useful, but even more useful if constructed to yield the information you really need.
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Solving Issues with Gloss
Your problem may be related to tooling, material, processing, or combinations thereof. Here’s how to find the root cause.
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Do You Have Screw Wear?
It’s generally caused by metal-to-metal contact, and your first indicator will be poor melt quality.
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The Importance of Oxidative Stability In Polyolefins, Part 2
The DSC test can do a reasonably good job of capturing the comparative behavior of materials that use similar antioxidant chemistries.
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EXTRUSION: Is Head Pressure Sapping Your Extruder’s Strength?
A redesign of all of the flow paths between the end of the barrel and die may be in order.
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INJECTION MOLDING: How to Mold Living Hinges With No Flexing Required
Here are the five critical, intertwined components that must be perfected for a living hinge that doesn’t need to be flexed upon ejection.
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