Know-How
INJECTION MOLDING: Get Control Over Barrel Zone Temperature Override
Poor temperature control results in an erratic melt stream and process. Here are some tips on how to get things under control.
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MATERIALS: The Problems with Single-Point Data, Part 8
DTUL tests may have made sense in the 1940s and 1950s, before the advent of dynamic mechanical analysis. But designers and engineers today need better tools.
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TOOLING: Designing Molds for Easy Maintenance in the Press, Part 1
Attention to design of cooling, ejection, and slides can save downtime and maintenance headaches.
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EXTRUSION: Melting 101
Learn the basics on how polymer melts in a single screw. Barrel temperature plays less of a role than you might think.
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INJECTION MOLDING: Develop Guidelines—Not Strict Procedures— For a Robust Molding Process
‘Fool-proof’ dos and don’ts will prove foolhardy in a process with so many variables. You aren’t slinging burgers.
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MATERIALS: The Problems with Single-Point Data, Part 7
The industry can choose between continuing to perform DTUL tests that provide single points that are part of a curve never seen, or perform the test that provides the entire curve.
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TOOLING: Dealing with Lifters--Part 2
This installment delves into more detail on some variables of design and fitting/timing of the lifters, which can cause issues or failures during molding.
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EXTRUSION: The Two Main Causes of Screw Wear
Wedging and misalignment are often confused with each other when inspecting a worn screw.
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INJECTION MOLDING: Gate-Seal Testing Done Right
Follow these 16 steps to perform the experiment and learn what is best for your part and process.
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MATERIALS: The Problems with Single-Point Data--Part 6
Data sheets can be limited in the information they provide on how the material performs at elevated temperatures.
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