COËFICIENT OF FRICTION – Static-Dynamic
Purpose of the test
This test is performed to determine the friction of paper, solid board or folding board.
Procedure
Operate the instrument in accordance with ISO 15359 and the manufacturer’s instructions.
Leave the samples exposed for 24 h to 23°C and 50% R.H., according to ISO 187.
Cut 2 x 10 test pieces (one test piece for the sled and one for the table) according to the standard, with the longer side parallel to the long side of the sheet.
Determine the static and dynamic coefficients of friction after one slide with the marked sides against each other.
Place the marked side (top of the stack, face-up) on the table with the arrow in the direction of the sled movement.
Mount the next sheet with the marked side (top of the stack, face-up) on the sled.
Determine the static and dynamic COF after one slide with the marked sides against each other.
Report 10 measures, their mean and standard deviation calculated to 3 significant figures.
ISO 15359
Nr. of samples
22 test pieces per level.
Sample size 110 x 280 mm²
No special sizes
Levels
Static:
Level 1: 0.25÷0.45
Level 2: 0.45÷0.80
Dynamic:
Level 1: 0.20÷0.30
Level 2: 0.30÷0.70
Reporting
Report 10 valid results of measurements, their mean and their standard deviation. All to three significant digits.
CEPI test 4.4
4.4(a); static
4.4(b); dynamic
