SANTOS, A. ; ANJOS, O. ; PEREIRA, H. (2015) - Estimation of Acacia melanoxylon unbleached kraft pulp brightness by NIR spectroscopy. Forest Systems. ISSN 2171-9845. 24(2), eRC03, 6 pages.
10.5424/fs/2015242-07580
Title
Estimation of Acacia melanoxylon unbleached kraft pulp brightness by NIR spectroscopy
Subject
Acacia melanoxylon Unbleached kraft pulps ISO brightness NIR RPD
Relation
www.inia.es/Forestsystems
Date
2015-08-03T17:09:15Z 2015-08-03T17:09:15Z 2015
Description
Research Communication. Aim of the study: The ability of NIR spectroscopy for predicting the ISO brightness was studied on unbleached Kraft pulps of
Acacia melanoxylon R. Br.
Area of study: Sites covering littoral north, mid interior north and centre interior of Portugal.
Materials and methods: The samples were Kraft pulped in standard identical conditions targeted to a kappa number of 15. A
Near Infrared (NIR) partial least squares regression (PLSR) model was developed for the ISO brightness prediction using 75 pulp
samples with a variation range of 18.9 to 47.9 %.
Main results: Very good correlations between NIR spectra and ISO brightness were obtained. Ten methods were used for PLS
analysis (cross validation with 48 samples), and a test set validation was made with 27 samples. The 1stDer pre-processed spectra
coupling two wavenumber ranges from 9404 to 7498 cm-1 and 4605 to 4243 cm-1 allowed the best model with a root mean square
error of ISO brightness prediction of 0.5 % (RMSEP), a r2 of 99.5 % with a RPD of 14.7.
Research highlights: According to AACC Method 39-00, the present model is sufficiently accurate to be used for process control
(RPD ≥ 8).
