Know-How
EXTRUSION: Effect of the Screw Flight On Melt Temperature, Energy Use
So-called rules of thumb regarding the design of flight clearance and width do not consider the temperature effect, both from the point of view of melt temperature and energy efficiency.
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A Better Way to Balance Die Flow
Use temperature adjustments before making any mechanical tweaks.
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Screw Speed Versus Recovery Time
Many molders don't take screw-rotation speed into account when developing a process for a new mold. Here's why they should.
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Leverage Your Cooling Power
You can predict the amount of heat you'll need to remove from parts before ejection with reasonable accuracy if you know polymer thermal properties and certain other rules of thumb.
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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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Shutting Down & Starting Up An Injection Molding Machine
Whether your press is going down for repairs, a holiday, or a slow production schedule, proper shut-down and start-up procedures must be followed.
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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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AC Drives Take Hold
With progress in electronics and the introduction of the flux vector drive using complex control algorithms, AC drives are now equal to or better than DC drives for most applications.
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