Know-How
EXTRUSION: Processing Rigid PVC? Know Your Rheology
Before choosing and sizing extruders for running rigid vinyl, it is wise to bone up on the viscosity behavior of the material.
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MATERIALS: Performance in Polyethylene: Density Matters: Part II
Remembering the case of the failed gas tanks.
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TOOLING: Balancing the Heat Budget In Injection Molds
Basic formulas for how much heat you must pull out of the mold to achieve a set cycle time
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EXTRUSION: When Internal Screw Cooling Makes Sense
Internal screw cooling could help you solve solids-feeding and burning problems.
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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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