processing tips
Extruding High-Temperature Resins
Older extrusion lines might not be suitable for processing materials up to 750 F. Here's what you need to know to get started.
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Melt Flow Rate Testing–Part 8
Here are the steps to take in cases where the MFR is not provided by the polymer supplier.
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Don’t Overlook Gate Location
Molders take heed: Gate location is the root cause of many molding difficulties. You’ll be doing yourself a big favor by spending some time and thought in determining the best gate location. Here’s what to look for.
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Mold Simulation: Get Best Results With Good Materials Data
Want the best results from your flow analysis software? Of course you do. But you stand a better chance for success if you pay particular attention to the material data used by the software.
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Telltale Temperatures
Here's how to get a 'feel' for a screw design without actually seeing it. And how to use this information.
Read MoreHow to Establish an Acceptable Range for Pressure at Transfer
Pressure at transfer tells you the viscosity of the resin, providing the fill time is the same. Monitoring pressure at transfer—or better yet, the integral under the pressure vs. time curve—provides insight into the process.
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Melt Flow Rate Testing—Part 6
Once degradation has been established, the discussion inevitably turns to how it happened. It might be expected that the answer to this question is widely known. Not so. The good news is that the influences that cause polymer degradation during processing are few.
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A Processor’s Advice on How to Get Moisture Testing Right
Follow these four steps to ensure your results are on target.
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Optimize Cooling Water Supply To Reduce Costs
In the last three articles (March, May, Sept. 2012), we introduced the problem of wasted energy in cooling-water systems and presented two types of solutions—minimizing “parasitic” heat gains and raising water temperatures to minimize demand.
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Optimize Resin Management in Extrusion Blow Molding
In the EBM process, profits depend greatly on how judiciously you use resin.
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