Know-How
EXTRUSION: Understanding The Barrier Gap
All barrier screws are not created equal, and the barrier length and gap can be one of the reasons.
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INJECTION MOLDING: Do You Need to Profile Injection Velocity?
Look at the parts. If the answer is yes, the on-machine viscosity curve can help.
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MATERIALS: The Problems with Single-Point Data: Part 10
You can predict creep performance of a material over time at a particular temperature by examining how its modulus changes over a range of temperatures.
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TOOLING: Repairing Molds in the Press: Part 3
This is the final part of a series on tooling in the press. This column will cover repairs that can be accomplished in the press.
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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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