Know-How - Materials

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Published: 10/30/2018

A Processor’s Most Important Job, Part 10
Glass and carbon fibers are often used to increase material strength and modulus. To maintain these properties, the aspect ratio of these fibers must be maintained.  

Published: 10/1/2018

Materials: A Processor's Most Important Job, Part 9
How to establish molding conditions that minimize internal stress in a part.

Published: 8/28/2018

Materials: A Processor’s Most Important Job, Part 8
How processing adjustments can control molded-in stress.

Published: 8/1/2018

Materials: A Processor's Most Important Job, Part 7
There are several process-related issues that influence crystallinity besides cooling rate. Let’s examine a few.

Published: 6/1/2018

Materials: A Processor's Most Important Job, Part 6
The importance of mold temperature to the development of the desired polymer crystalline structure becomes absolutely crucial in the case of high-performance materials.

Published: 4/27/2018

Materials: A Processor's Most Important Job, Part 5
Using a mold temperature above a polymer’s Tg ensures a degree of crystallinity high enough to provide for dimensional stability, even if the part must be used at elevated temperatures. But POM is an exception. Why?

Published: 3/29/2018

Materials: A Processor’s Most Important Job, Part 4
Engineering polymers require higher mold temperatures to achieve their ideal structure. The temptation to turn down the mold temps can hurt part performance.

Published: 3/1/2018

Materials: A Processor’s Most Important Job, Part 3
Processors are often expected to compensate for ill-advised decisions made earlier in the product-development process. In the case of shrinkage, one of the most common ‘fixes’ is to simply reduce the mold temperature.

Published: 1/23/2018

Materials: A Processor’s Most Important Job, Part 2
Process conditions help determine the difference between the maximum degree of crystallinity that can be achieved in a polymer and the degree that is present in a molded part.

Published: 1/2/2018

Materials: A Processor’s Most Important Job, Part 1
Many processors don’t realize that preserving material characteristics is crucial to product success and failure. The focus here is on molecular weight.