processing tips
Injection Molding: New Mold Trial—Will It Run 24/7?
Use this nine-step process to make sure you’ll be making good parts after a successful trial. But even then, be prepared for some hiccups.
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Materials: Cycle Time—Science vs. Rules of Thumb, Part 6
This installment—on elastomers—completes a series, whose theme is to bring more science to the discipline of molding. The overall message: Ask a lot of questions whenever someone posits this or that ‘rule of thumb’ about processing.
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Extrusion: The Challenges of Extruding Highly Filled Polymers
These materials require screw changes and modifications in upstream and downstream equipment and operating procedures.
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Injection Molding: No, Backpressure Does NOT Raise Melt Temperature
It’s a classic confusion between cause and effect. Melt temperature rises when screw speed is increased. Check out this data.
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Materials: Cycle Time: Science vs. Rules of Thumb—Part 5
Let’s examine the behavior of semi-crystalline materials that never reach their glass-transition temperature as they cool.
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To Produce Quality Extrusions, Get Control Over Melt Temperature
Temperature zone settings are often misunderstood and improperly adjusted. This often contributes to poor film quality and lower production.
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How to Prevent Stress Whitening in PP Copolymers
A look at causes, detection, and prevention.
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Tooling: Dealing with Sprue Bushings On the Production Floor
Causes of and solutions to some problems you probably deal with every day.
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Cycle Time: Science vs. Rules of Thumb—Part 4
While laboratory tests are helpful in determining how polymers behave, you must remember the fundamental differences between laboratory measurements and the real world of plastic processing. Let’s examine semi-crystalline polymers here.
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How Low Can Low-Rate Feeders Go?
More and more processors are looking for greater precision from their feeding equipment. Here’s what some are doing about it.
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