1.1 This test method covers a procedure used to measure the resistance to bending of paper and paperboard.
1.2 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 15°: 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.
1.3 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.
1.4 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.
1.5 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.
| Number of Pages : | 5 |
| Published : | 01/01/2008 |
