Know-How
INJECTION MOLDING: Setting Mold Protection Takes Time But Saves More
Mold protection is often neglected, but it more than pays for the time and attention required.
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MATERIALS: Performance in Polyethylene: Density Matters
In polyethylene, density provides another mechanism to control properties. But it must be specified properly.
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INJECTION MOLDING: Troubleshooting Bridging
Bridging is an aggravating problem that can shut you down. Here's how to find it and fix it.
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EXTRUSION: What’s the Right Feed Throat Temperature?
Selecting the proper one is critical to the process.
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INJECTION MOLDING: ‘Know Your Machine’
Many molders think they “know their machine,” but in reality do not. They get consumed by the demands of day-to-day production requirements and lose sight of the big picture.
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MATERIALS: Melt Flow Rate Testing—Part 10
Two areas where the melt flow rate test it is not useful are related to processing.
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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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