Method and apparatus for measuring paper sample stiffness

Details Method and apparatus for measuring paper sample stiffness Method and apparatus for measuring paper sample stiffness

2007-05-30

2009-08-25

Williams, Hezron (Department: 2856)

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

By loading of specimen

C073S835000, C073S159000, C073S866000

Reexamination Certificate

active

07578200

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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