ROUGHNESS – Parker Print Surf
Purpose of the test
This test is performed to determine the roughness of paper, solid board or folding board using the Parker Print Surf method.
Procedure
Operate the instrument in accordance with ISO 8791-4 and the manufacturer’s instructions.
Leave the samples exposed for 24 h to 23°C and 50% R.H., according to ISO 187.
Make a measurement on each test piece with a head pressure of 19,6 kPa, a soft backing and a clamping pressure of 1,0 MPa with the marked side turned towards the air flow (upwards).
Report 10 measures in µm, their mean and standard deviation calculated to 3 significant figures.
ISO 8791-4
Nr. of samples
12 test pieces per level
Special size A4
Levels
Level 1: 1.0÷2.0 µm
Level 2: 2.5÷3.5 µm
Level 3: 5.0÷7.5 µm
Reporting
Report 10 valid results of measurements in µm, their mean and their standard deviation. All to three significant digits.