Know-How
Where and How to Vent Injection Molds: Part 3
Questioning several “rules of thumb” about venting injection molds.
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Configuring the Twin Screw Extruder: Part 4
For many compounding operations, material is fed to the extruder at the feed throat. This is the case when feeding a single polymer or a blend of polymers mixed with solid additives. Some ingredients, however, present a challenge in feeding. Here’s how to solve to them.
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Back to Basics on Mold Venting (Part 2: Shape, Dimensions, Details)
Here’s how to get the most out of your stationary mold vents.
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Single vs. Twin-Screw Extruders: Why Mixing is Different
There have been many attempts to provide twin-screw-like mixing in singles, but except at very limited outputs none have been adequate. The odds of future success are long due to the inherent differences in the equipment types.
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Back to Basics on Mold Venting (Part 1)
Here’s what you need to know to improve the quality of your parts and to protect your molds.
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How to Design Three-Plate Molds: Part 2
There are many things to consider, and paying attention to the details can help avoid machine downtime and higher maintenance costs, and keep the customer happy.
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What's the Allowable Moisture Content in Nylons? It Depends: Part 2
Operating within guidelines from material suppliers can produce levels of polymer degradation. Get around it with better control over either the temperature of the melt or the barrel residence time.
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How to Design Three-Plate Molds, Part 1
There are many things to consider, and paying attention to the details can help avoid machine downtime and higher maintenance costs, and keep the customer happy.
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Using Data to Pinpoint Cosmetic Defect Causes in Injection Molded Parts
Taking a step back and identifying the root cause of a cosmetic flaw can help molders focus on what corrective actions need to be taken.
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Hot Runners: How to Maintain Heaters, Thermocouples, and Controls
I conclude this three-part examination of real-world problems and solutions involving hot runners by focusing on heaters, thermocouples, and controls. Part 3 of 3.
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