Injection Know How
How 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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Minimizing Black Specks
Black specks in molded parts are one of the most infuriating problems to resolve on the shop floor. Here's how to fix them.
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Don’t Forget the Cold Slug Well
Its primary function—as the name suggests—is to act as a trap, or “well,” for the cold slug.
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‘Auto Compensate’ Your Press To Handle Viscosity Variations
Here's how to put your injection molding machine on cruise control to make consistently good parts even in the face of material viscosity variations.
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Level Your Press in an Hour or Less
A level injection molding machine is necessary to keep producing high-quality parts. Here's how to do it right.
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What's Different About Molding Engineering Plastics
If you try to run them like commodity materials such as PP you'll have problems.
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Take a Scientific Approach to Troubleshooting
Taking a scientific approach minimizes the 'art' of molding, which is particularly helpful when troubleshooting
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Screw Decompress Before Screw Rotate
Thoughtfully determining when to start screw rotation to build the charge for the next shot can reduce the wear and tear on the screw tip, check valve, and screw motor.
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Coping with Weak Weld Lines
Weld lines cause significant reject rates and are a common problem that all molders face.
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