MRP-ST LAB PPS 2015
MRP-ST LAB PPS 2015 – roughness measurement according to the Parker-Printsurf method for MRP-Schnettler automatic test line
Laboratory roughness measurement
There are three common test methods for determining the roughness or smoothness of paper: Bekk, Bendtsen and Parker Print Surf (PPS) smoothness. MRP and Schnettler recommend the roughness measurement according to Parker Print Surf for smooth graphic papers intended for high-quality printing.
Characteristics / Features
The roughness measurement according to Parker Print Surf in the automatic test line is characterized by the following characteristics:
- contacting measurement
- good repeatability
- Reference samples are included
The applied measuring principle is called air flow measurement. Here, a measuring head is pressed against the paper and the amount of air that escapes at a defined pressure is a measure of the quality of the paper surface. The results of each measurement are converted into μm. The lower the measured value, the more even or smooth the surface.