Standard: TAPPI - T 489 OM
BENDING RESISTANCE (STIFFNESS) OF PAPER AND PAPERBOARD (TABER-TYPE TESTER IN BASIC CONFIGURATION)
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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 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.
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.
|Document Number:||t 489 om|
|Change Type:||COMPLETE REVISION|
|Most Recent Revision:||YES|
|Document #||Change Type||Update Date||Revision||Status|
|T 489 OM||Change Type: STCH||Update Date: 2008-01-01||Status: INAC|
|T 489 OM||Change Type:||Update Date: 2004-01-01||Status: INAC|
|T 489 OM||Change Type:||Update Date: 1999-08-19||Status: INAC|
|T 489 OM||Change Type:||Update Date: 1992-01-01||Status: INAC|