Smoothness according to Bekk
Bekk smoothness is a method for characterising the surface topography of smooth paper or films with a roughened surface. The measuring principle is based on the fact that the surface to be characterised is placed on a flat glass plate with a hole. A vacuum is created over the bore, which sucks the sample surface onto the glass. The time for the vacuum decrease between 2 defined pressure points is measured. The method is not suitable for very rough and porous materials and very smooth plastic films.
In short — AI-generated
The Bekk smoothness test measures the surface topography of paper or films by evaluating how tightly the material seals against a flat glass plate under vacuum. A sample is placed over a hole in the glass, and the time required for a specific volume of air to pass between the sample surface and the glass plate is recorded.
The resulting value represents the smoothness in seconds, where a higher value indicates a smoother surface. This measurement is used in practice to predict how well a material will perform during printing or coating processes, as surface texture directly impacts ink transfer and adhesion quality.
Text is AI-generated; based on test method data curated and verified by Innoform.