Determination of the in-plane wetting of a board structure using NIR spectroscopy
2007 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, Vol. 22, no 1, 111-116 p.Article in journal (Refereed) Published
Edge wicking is one of the most critical parameters of liquid packaging board. In this study near infrared (NIR) spectroscopy in combination with multivariate analysis was used to measure the in-plane wetting profile of hard sized board structures after exposure to water. This was done using a moving NIR probe and registering the spectra in series. Two grades of commercial board and one laboratory-made board were tested. The NIR spectra of samples with moisture contents of between 5% and 50% (completely soaked), measured gravimetrically, were collected. Two partial least squares (PLS) models were created using the NIR spectra as the x matrix and the moisture content measured gravimetrically as the y matrix, one containing observations of the two commercial board grades and the other one containing observations of the laboratory-made board. The correlation coefficients, R-2, of the calibration sets were 0.99 for each of the two models respectively, and the root mean square errors of prediction (RMSEP) for the test sets containing new observations were 2.1% and 1.3% respectively. Two different trials were set up to verify the NIR method. In the first trial, the average moisture contents of the samples, measured gravimetrically, were compared with the moisture content profiles measured using the NIR technique. In the second trial, the edge wicking values for samples immersed in water for different durations and at different temperatures were measured using NIR spectroscopy, and the results were compared to those of a reference method for measuring edge wicking. The method gives information about the mechanisms of liquid penetration and more details about the moisture content profiles of sized boards and is useful in studying edge-wicking mechanisms in paper boards.
Place, publisher, year, edition, pages
2007. Vol. 22, no 1, 111-116 p.
AKD-Sizing, Edge penetration, Liquid packaging board, Moisture content, Near infrared spectroscopy, Wicking
Paper, Pulp and Fiber Technology
IdentifiersURN: urn:nbn:se:kth:diva-6272DOI: 10.3183/NPPRJ-2007-22-01-p111-116ISI: 000248528700016OAI: oai:DiVA.org:kth-6272DiVA: diva2:10944
QC 20101125. Uppdaterad från Manuskript till Artikel (20101125).2006-10-232006-10-232010-11-25Bibliographically approved