Bending resistance (stiffness) of paper and paperboard (Taber-type tester in basic configuration), Test Method TAPPI/ANSI T 489 om-15
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This test method covers a procedure used to measure the resistance to bending of paper and paperboard.
This test method is used to determine the bending moment required to deflect the free end of a 38 mm (1.5 in.) wide vertically clamped specimen 150 from its center line when the load is applied 50 mm (1.97 in.) away from the clamp. The resistance to bending is calculated from the bending moment.
TAPPI T 566 “Bending Resistance (Stiffness) of Paper (Taber-Type Tester in 0 to 10 Taber Stiffness Unit Configuration)” describes a modification of the instrument described in this test method for measurements in the 0 to 10 Taber stiffness range only, and which requires a smaller test specimen. The modified procedure may be recommended for papers which are low in grammage, highly flexible, or both.
Test results obtained using modifications of the basic Taber-type instrument such as that described in TAPPI T 566 “Bending Resistance (Stiffness) of Paper (Taber-Type Tester in 0 to 10 Taber Stiffness Unit Configuration)” have been reported to be as much as 40% different from those obtained using this test method, and such modifications must not be used when this test method is specified.
Other procedures for measuring bending resistance include TAPPI T 535 “Stiffness of Paperboard (Resonance Length Method)” and TAPPI T 543 “Bending Resistance (Stiffness) of Paper (Gurley-Type Stiffness Tester).” The latter method has been classified as Classical.