MRP-ST LAB BEN 2015 - Roughness measurement according to the Bendtsen method for MRP-Schnettler test line

Laboratory roughness measurement

There are three common test methods for determining the roughness or smoothness of paper: the smoothness after Bekk, Bendtsen and Parker Print Surf (PPS). MRP and Schnettler recommend roughness measurement according to Bentdsen for uncoated papers or for medium smooth surfaces.

Indicator / Characteristics

The roughness measurement according to Bendtsen in the automatic test line is characterized by the following characteristics:

• one-sided, contact measurement
• good repeatability
• Reference samples are included

Physical principle

The applied measuring principle is called air flow measurement. Here a measuring head of the pressed against the paper and the amount of air that escapes at a defined pressure is a measure for the quality of the paper surface. The results of each measurement are displayed at the differential pressure in ml/min is indicated. The lower the measured value, the more uniform or smoother is the surface.