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Paper Optics

We are active in the front of Paper Optics research. We developed a user-friendly simulation tool, Grace, which uses different models to simulate, e.g., mottle and fluorescence. Monte Carlo models allow simulating any physical process concerning light-paper interaction on a particle level. In the figure, it shows the simulated CIE whiteness for a multi-layer board for layers with different optical properties. The images show examples of simulated fibre network and resulting white-top mottle as well as print mottle with prefect print halftones.

Beskrivning: MottlePicture.png

Simulated CIE whiteness for a multi-layer board for layers with diffferent optical properties. The embedded images show examples of fibre network and resulting white-top mottle as well as print mottle with perfect print halftones.

The appearance of paper depends on the light reflected by and emitted from the paper. On a paper machine, it is not easy to control all the factors influencing the appearance of paper. However, this can be achieved by using well developed optical modeling tools.

 

Contact

Li Yang
+46 8 676 7134
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Published:

L. G. Coppel, M. Neuman and P. Edström, " Extension of the Stokes equation for layered constructions to fluorescent turbid media", accepted for publication in J. Opt. Soc. Am. A.

L. G. Coppel, M. Andersson, P. Edström, and J. Kinnunen, "Limitations of the efficiency of fluorescent whitening agents in uncoated paper", Nordic Pulp and Paper Research Journal, 26(3), 319-328 (2011).

L. G. Coppel, M. Andersson, and P. Edström, "Determination of quantum efficiency in fluorescing turbid media," Applied Optics, 50(17), 2784-2792 (2011).

L. G. Coppel, Whiteness and fluorescence in paper – Perception and optical modelling, Licentiate Thesis nr. 47, Mid Sweden University, Sweden.

L. Yang and Roger D. Hersch, "Extending the Kubelka-Munk model to a non-diffuse light distribution", J. Imaging Science and Technology, vol. 52, pp. 030201-7 (2008).