Know-How
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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The Cause of Catastrophic Screw Wear
Erratic feeding can be the culprit. This is not uncommon when dealing with recycled material.
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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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Dimensional Stability after Molding—Part 5
All materials possess a property called the coefficient of thermal expansion (CTE). The vast majority of materials increase in size as their temperature increases and decrease in size as their temperature declines.
Read MoreThe Limits Of Compression Ratio
Don't rely just on this value during the screw design process.
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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.
Read MoreDimensional Stability After Molding: Part 4
In the first three parts of this series we focused on those influences that cause molded parts to get smaller. But there are environmental factors that also cause parts to increase in size over time.
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Cooling Tips for Crystalline Polymers
If a little cooling is good, is a lot of cooling better?
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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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Dimensional Stability after Molding—Part 3
Any process that involves melting and re-solidifying a polymer involves a compromise between achieving the perfect structure and producing a part that can be sold at a price that the market is willing to pay.
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