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Resin Dryers: What do they do, and how do they work? The basics
If you know anything about plastics processing, you know that it begins with resin pellets. There are many different types of plastic resins that offer a wide range of different physical and chemical characteristics. These differences in characteristics make every resin unique. The environment and seasonal changes also play a...
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What’s the role of a crystallizer?
In simplest terms, a crystallizer is a heating device that converts virgin, post-process, or scrap PET from an amorphous state to a semi-crystalline state. Crystallizers are important to processors who generate or utilize large volumes of scrap or recycled PET material. Because processing causes virgin PET material to change state...
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What’s the difference between humidity and dew point? And, why is “low dew point air” so important to resin drying?
Let’s start with humidity: Humidity describes moisture or water vapor that is contained in air. The weight of water present in a cubic meter of air is known as its Specific Humidity. Few people use that measure however. It’s much more useful to discuss Relative Humidity, which compares the actual...
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Who’s got the most efficient dryer of all?
“Mirror, mirror on the wall, who makes the most efficient dryer of all?” Good question. Any self-respecting manufacturer or sales rep is likely to give you essentially the same answer: “We are the energy leaders. No dryer performs like ours. My dryer is the most efficient dryer of all.” Obviously,...
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What does pellet size have to do with drying performance?
Resin manufacturers typically provide recommendations for the temperature and length of time required for resin drying. Between two samples of the same hygroscopic material of equal weight, however, differences in the physical size and shape of resin particles mean that one of the samples may dry more quickly than the...
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Why Proper Drying is So Critical, and How the Wrong Drying Equipment can be a Liability
The average plastics processor has a small fortune tied up in auxiliary equipment and plant facilities, and often even more in engineered materials. And, the value of keeping the long-term trust of your most demanding customers? Priceless. If you consider the fact that improper drying can have a negative impact...
By A.J. Zambanini 
By Chad Stover