Cooling Rubber Covered Rollers and School

Posted by David Roisum on February 13, 2012

Metso’s Up and Running E-news has another roller related article. This one is on Guidelines for Internal Water Cooling of Rubber Covered Rolls. While it is considered tasteless to critique an article when you yourself have not written anything better (or at all) on the subject, I often lack in certain social graces. The first is not really a critique per se, but just an observation that the details are a bit peculiar to one application (the wet end of a paper machine). However, second is an observation that while a delta of 10 F between inlet and outlet coolant temperature (it need not be limited to just water) is a nice guideline, an alternative and possibly more relevant observation would be to use IR or other techniques to measure the delta across the roller surface. Here, a delta of 5 F might be considered Chevrolet quality. Finally, there is no mention of the science behind all of this. Almost all high-end thermal rolls are modeled via FEM (or similar technique) and the design adjusted accordingly. The results don’t just make for pretty graphics, they also confirm that ‘1 picture truly is worth 1000 words.’

Having said all of that, I will give them an out for shorting the article; the format of the Up and Running is written, as is this blog, for those attention-deficit-disorder techies, such as myself, or those too busy, such as most of us, that don't have time for more than a few paragraphs before our multi-tasking juggle tries to catch the next ball. Oops, as earlier an earlier self-observation about social graces, I've just insulted everyone I work with; but it's probably just a touch of my Asperberger's flaring up, oops there it goes again.

Let us all make the effort to take a time out to invest in our future: Get Schooled.

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