Method and apparatus for measuring paper sample stiffness
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United States of America Patent
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Aug 25, 2009
Grant Date -
Mar 6, 2008
app pub date -
May 30, 2007
filing date -
May 31, 2006
priority date (Note) -
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Abstract
A method for measuring the rigidity of paper or other products made from cellulose fibers wherein the paper is torn and a digitized sound recording is made during the tearing process which is then analyzed to determine the percentage of time during which characteristic frequencies are present during the tearing process. It has been found that this percentage correlates well with rigidity.
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