Materials Know How
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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Dimensional Stability After Molding—Part 2
After molding, acetal parts can continue to shrink at room temperature and even in the cold.
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Dimensional Stability After Molding: Part 1
The degree to which molded parts shrink as they cool is largely dependent upon the composition of the material being processed.
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PBT & PET Polyester: Part 2 The Performance Factor
All things being equal, PET will outperform PBT mechanically and thermally. But the processor must dry the material properly and must understand the importance of mold temperature in achieving a degree of crystallinity that allows the natural advantages of the polymer to be realized.
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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.
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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.
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Biopolymers: Time to Take A Deep Breath
Are we looking at all of the implications associated with developing this new 'crop' of polymers?
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Working with Color Concentrates
Industry needs more development of enhanced-mixing screws.
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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.
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