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Measuring liquid penetration in the thickness direction of paper

Published online by Cambridge University Press:  25 October 2005

T. Karppinen ,
I. Kassamakov ,
J. Aaltonen ,
H. Pajari  and
E. Hæggström
T. Karppinen*
Affiliation:
Department of Physical Sciences, University of Helsinki, PO Box 64, 00014, Helsinki, Finland
I. Kassamakov
Affiliation:
Department of Physical Sciences, University of Helsinki, PO Box 64, 00014, Helsinki, Finland Helsinki Institute of Physics, PO Box 64, 00014, Helsinki, Finland
J. Aaltonen
Affiliation:
Helsinki Institute of Physics, PO Box 64, 00014, Helsinki, Finland
H. Pajari
Affiliation:
Oy Keskuslaboratorio - Centrallaboratorium Ab, PO Box 70, 02151, Espoo, Finland
E. Hæggström
Affiliation:
Department of Physical Sciences, University of Helsinki, PO Box 64, 00014, Helsinki, Finland Helsinki Institute of Physics, PO Box 64, 00014, Helsinki, Finland
*
timo.karppinen@helsinki.fi
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Abstract

We introduce a method to measure liquid absorption into paper based on measuring white light reflected from it. The method was used with 49.8–51.7 g/m2 pilot papers, whose hydrophobicity was tuned by their fiber content and furnish. In addition, one of the samples was internally sized. Impact wetting was used where a droplet of mineral oil, isopropanol or deionized water was applied to the paper surface opposite to the one facing the monitor. The volume of liquid per droplet was (0.9±0.2) μl to (1.3±0.1) μl. The sample was illuminated with an ordinary 20 W light bulb from above. The light intensity reflected off the sample was recorded with a fast charge-coupled camera during the liquid penetration. Optical changes in the paper sample were studied by calculating the average intensity of the reflected light from a selected area. The results showed that the speed of pore wetting, mainly in the z-direction, could be measured with each liquid-sample combination. Hence a digital camera based light reflection measurement can provide information about thickness direction liquid transport in paper.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 32 , Issue 1 , October 2005 , pp. 65 - 71
Copyright
© EDP Sciences, 2005

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