THE OpTest print mottle analyser (PMA) revolutionises the measurement of print mottle, according to IDM Instruments , as it quickly quantifies print non-uniformly over a range of mottle sizes.
The PMA offers a fast, repeatable instrumental determination of print mottle that emulates human perception.
Using advanced wavelet algorithms, the PMA enables comparisons with reference samples to be performed automatically, providing the user with a more precise determination of print mottle intensity and size scale differences.
This has proven to be more objective than visual testing of white top liner board and ink printability.
The PMA measures solid print areas up to 50mm x 50mm. It calculates the print mottle intensities for five size ranges, or components, ranging from 0.5 to 8mm.
The PMA allows papermakers and ink makers to optimise printability properties more efficiently, saving time and money while improving quality.
Proven tests demonstrate agreement between visual panel rankings and the PMA indices.