Know-How

Melt Flow Rate Testing – Part 2

To fully appreciate the strengths and weaknesses of the melt-flow-rate (MFR) test it is important to know something about the way the test is performed.

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Extrusion

Understanding Screw Breakage

You might think you're over-torquing the screw, but more often than not bending is the reason.

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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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Your Pre-Installation Checklist-Part 1

The work really begins after you've ordered your new machine.

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Multicomponent

Pay Attention to Heat Transfer

Money will be lost if cooling is not done right.

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Extrusion: Where's the Data? The Importance of Melt Strength in Extrusion

All extrusion processes depend to some degree on the melt strength of the polymer, and this property is generally a no-show on data sheets.

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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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sustainability

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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Materials

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.

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