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Mai 12, 2017

Consistency in sheet solid points

“Percentages are for accountants”


Not that there’s anything wrong with that. If you’re a technical person, you have to watch out for what is hidden behind those pesky ratios. A great example in papermaking is the classic “just a couple points of sheet solids.” It’s important to remember that a couple points off the couch is very different than a couple points after the press.  The graph below illustrates what those 2 points of consistency mean at 2 different points along the machine.


So what, you say? So…


1)     A 2 point consistency drop at the couch could mean 25% more water has to be removed in the press to maintain solids out of the press.

2)     Slight variations off the couch have a significant impact on pressing efficiency.

3)     Off-couch consistency is a critical process control variable.

4)     The difference between a press operating efficiently and causing you a lot of grief is a very, very small amount of water.



About AstenJohnson

AstenJohnson is a global manufacturer for the paper industry, supplying paper machine clothing and advanced filtration fabrics to papermakers around the world. As a supplier to the paper industry since 1790, AstenJohnson and its family of companies leverage longstanding knowledge of manufacturing processes to offer all its customers deep expertise and innovation. The company employs approximately 2,000 people. Its corporate headquarters is in Charleston, South Carolina, USA.