Contact person
Mikolaj Malinowski
Forsknings-och utvecklingsingenjör
Contact Mikolaj
Micro Gloss variation measurement
The micro gloss variation measurement gives a more comprehensive and correct understanding of how the surface is perceived when it comes to gloss compared to the standard gloss equipment like Hunter, Lehman and Zehntner devices giving only a single mean gloss value.
Purpose
A sample can have a high mean gloss value (normally considered as good) but at the same time have a high gloss variation which is disturbing when looking at a printed picture. The micro gloss method can quantify such disturbing gloss textures and ‘glare effects’ on printed and unprinted samples.
This method can be used for:
- Measure if the gloss variation is acceptable and stable over time
- Benchmark to competitors
- Monitor how new settings in the production affect the gloss variation
- Check if new products are better or not when it comes to gloss
Method
Images of the samples are captured using a 20º/20º degree setup for camera and illumination. Frequency analysis is used to calculate the gloss variations at small-, mid- and large scales.
The image size is 13x13 mm and normally 9 areas are evaluated for better accuracy. Both printed and unprinted samples can be measured. The method is best suited for glossy papers.
Deliveries
The gloss variations divided into wavelength classes.
Since wavelengths in the range of 0.5 – 4 mm are most disturbing at normal reading distance these are the most important data.
The most disturbing gloss variations in the range of 0.5 to 4 mm are also combined into one single gloss variation value that correlates well to the human perception.
The results are saved in an Excel file.
TIFF-images showing the gloss variation of the samples (optional).
