OPTICAL METHODS FOR MEASURING THE SURFACE QUALITY OF PAPER

Citation
J. Tornberg et J. Sumen, OPTICAL METHODS FOR MEASURING THE SURFACE QUALITY OF PAPER, Paperi ja puu, 78(6-7), 1996, pp. 368
Citations number
3
Categorie Soggetti
Materials Science, Paper & Wood
Journal title
ISSN journal
00311243
Volume
78
Issue
6-7
Year of publication
1996
Database
ISI
SICI code
0031-1243(1996)78:6-7<368:OMFMTS>2.0.ZU;2-2
Abstract
The application of IR spectrometry for porosity characterization and c oatweight measurement was investigated. The aim of the coatweight meas urement was to develop a microscale measurement principle. Near infra- red (NIR) reflectance measurement provided information on the porosity of the coating. The results gave a satisfactory correlation with thos e obtained with the extruder method used as a reference for printing i nk absorption. The standard deviation with the IR method was about I u nit, compared with 0.5 units for the reference method. Middle infra-re d (MIR) reflectance measurement gave very good correlations with the c oatweights of papers coated with either china clay or carbonate, or wi th mixtures of the two. The advantages of MIR include strong absorptio n bands with all the main coating material components, sharp absorptio n peaks and low scattering MIR measurement was the most promising meth od in this study for development of a commercial instrument. The metho d can also be used for microscale measurement.