Know-How - Materials

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Published: 7/30/2012

Use MFR Cautiously with Filled Materials
If melt flow rate tests are used to evaluate the effect of processing on the average molecular weight of the polymer, the applicable rules must consider the contribution of the filler to the test result.

Published: 6/26/2012

When It Comes to Nylon, Don’t Do the Math
Chemistry is seldom as simple as it looks. Polymer chemistry takes the complexity up a notch. Nylon chemistry is about much more than doing the math.

Published: 5/29/2012

Density & Molecular Weight in Polyethylene
This so-called 'commodity' material is actually quite complex, making selecting of the right type a challenge.

Published: 4/26/2012

Biopolymers: Time to Take A Deep Breath
Are we looking at all of the implications associated with developing this new 'crop' of polymers?

Published: 3/26/2012

Working with Color Concentrates
Industry needs more development of enhanced-mixing screws.

Published: 2/21/2012

Working with Color Concentrates
Perhaps the greatest difficulty involving the use of color concentrates is specifying them appropriately for the material to which they are being added.

Published: 1/28/2012

Working with Color Concentrates
Because the consumer sees so many colored plastic articles, it is natural to assume that the process of achieving molded-in color is a simple one. Those of us in the industry know differently.

Published: 12/27/2011

Low-Cost Processing, Long-Term Problems
You can't cut your way to prosperity.

Published: 11/28/2011

The Importance of Melt & Mold Temperature
Molders should realize how significantly process conditions can influence the final properties of the part.

Published: 10/25/2011

The Effects of Stress
Previously we have discussed the effects of temperature and time on the long-term behavior of polymers. Now let's take a look at stress.