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Nip Impressions® is Paperitalo Publications' flagship publication.  Published every Thursday afternoon (US Eastern Time), Nip Impressions® is eagerly read by pulp and paper professionals around the world.

8 Oct 14: Applications in Use, VI--Why so tall?


Sign up for the 5th Annual Conference, 26 - 28 Oct 14,  


A concept we continually challenge here at the LGMI is tradition.  Pulp and paper mills are some of the oldest industrial facilities in the world.  Many, many things we do regularly in designing and operating mills has been and is being done because "we have always done it that way."  


Sadly, some of the elements we accept in this manner are so ingrained we don't even think about them.


For instance, why is a paper machine building so tall?


You'll say, that's a stupid question, Jim, everything has to fit inside the building.  


Let's think about this for a minute.  


I would say the wet end is so tall due to the traditional materials selection dictating the size of rolls and so forth.  Poorer materials from days gone by dictated large diameter rolls in order to meet deflection and strength requirements.  We can make smaller rolls do the same job today.  


Hence, lower building height in the wet end.


In the dryers, we have had tall hoods which date from the days when we did not understand air flow and psychometric conditions nearly as well as we do now nor nearly as well as we can measure them now.


Use the engineering tools and scientific principles we know today and make the hoods lower.


Do all these things and what have we done?  Can we take, five feet, maybe even ten feet out of the height of a paper machine building?  What does this do to the cost of the structure?  What does this do to the cost of the foundation?  What does this do to the wind load design?


There is real money here, folks.


Comments? Please send an email to
with "LGMI Frontiers" in the subject line.   



LGMI Design Practices
As always, your comments will be appreciated.
Think light!


Brian Brogdon, Ph.D.
Executive Director




Jim Thompson

Send us your comments by emailing Brian Brogdon
or Jim Thompson!




LGMI Weekly Ideas are presented for your consideration and inspiration only.  It is solely your responsibility to check for engineering correctness, applicability, standards, insurance policy and local, national or any other legal compliance required before implementing.  Neither The Light Green Machine (TM) Institute, Paperitalo Publications, Talo Analytic International, Inc., nor any individual associated with these entities accepts any responsibility for your application or compliance issues.

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