Know-How
EXTRUSION: Venerable Maddock Mixer Still an Extrusion Workhorse
Variations to this decades-old mixing section are widely used, but processors should carefully analyze these designs and not assume they will perform better.
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INJECTION MOLDING: Improving Barrel-Temperature Measurement and Control
Proper thermocouple placement and contact area are crucial, as is wire maintenance. But remember that barrel temperature and melt temperature are not the same
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MATERIALS: The Problems with Single-Point Data: Part 9
Time—and not just temperature—governs the behavior of materials under load. Both must be considered when evaluating a polymer for an application.
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RECYCLING: The Importance of Quality-Assurance Testing for Recycled Materials
Consider investing in these tools to ensure your material makes the grade.
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TOOLING: Designing Molds for Easy Cleaning & Maintenance in the Press
Pay attention to water leaks and rust, proper grease selection, vent buildup, and checks for wear.
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EXTRUSION: Managing Regrind
Reusing scrap is a necessary evil. But be aware of the negative impact scrap has on properties and extrusion efficiencies. Start by developing a regrind-usage program.
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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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