Know-How
Shutdown Tips For Accumulator Heads
Here's what you need to know to properly shutdown an accumulator head blow molding machine after a week running parts.
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New Frontier for Single Screw R&D: Mixing & Melting by Extensional Shear
Extensional shear generally has been associated only with twin-screw extruders. However, I am now convinced it can be done with a single moving force (screw) by changing the geometry of the flow field perpendicular to the direction of flow.
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Get the Most From Your Tooling
The history and culture of the molding industry has been to pull out every trick possible to work around design, resin, tooling, processing, and testing issues once the mold arrives. It is time to rewrite history.
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The Power-Law Coefficient
By referring to the power-law coefficient, the effect of barrel override in the metering section of many screws can be explained and anticipated.
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Establish a True ‘24/7’ Production Process
New or existing mold trials need to produce a production-worthy process that will run 24/7.
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Maintenance Terms of Endearment
Look closely at your company鈥檚 mold maintenance language and formalize your approach to create a clear and concise picture鈥攐ne that can be measured.
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Mission (Nearly) Impossible: Estimating Extrusion Melt Temperature
Extrusion processors often ask screw designers to estimate the output and melt temperature of a new design in the works. Projected output of a new screw can usually be estimated fairly accurately. Melt-temperature estimate, however, is another story
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Nozzle Leaks: Why They Occur, How to Detect & Fix Them
Nozzle leaks are a serious problem in injection molding. Here are some causes and remedies.
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Use MFR Cautiously with Filled Materials
If melt flow rate tests are used to evaluate the effect of processing on the average molecular weight of the polymer, the applicable rules must consider the contribution of the filler to the test result.
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Get Smarter on Extruder Sizes
Processors tend to recommend a much larger extruder than what鈥檚 really necessary for the job and the capabilities of the downstream equipment.
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