BENDING STIFFNESS – Static (5°; 50mm)
Purpose of the test
This test is performed to determine the weight of paper, solid board or folding board.
Procedure
Operate the instrument in accordance with ISO 5628 and the manufacturer’s instructions.
Leave the samples exposed for 24 h to 23°C and 50% R.H., according to ISO 187.
Cut 10 test pieces 38 mm wide and approximately 70 mm long with the longer side in the direction of the arrow.
Measure the bending resistance on 10 test pieces.
Place the test pieces with the marked side in the direction of the measuring cell.
For all three samples the bending length is 50 mm and the bending angle 5°.
Report 10 measures in mNm, their mean and standard deviation calculated to 3 significant figures.
ISO 5628
Nr. of samples
12 test pieces per level
Sample size 150 x 150 mm²
Special size A4
Levels
Level 1: 5.5÷5.9 mNm
Level 2: 25÷30 mNm
Level 3: 250÷300 mNm
Reporting
Report 20 valid results of measurements in mNm, their mean and their standard deviation. All to three significant digits.