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Journal articles
Open Access
Dryer drainage systems move into the fast lane, TAPPI JOURNAL, November 1999, Vol. 82(11)

Dryer drainage systems move into the fast lane, TAPPI JOURNAL, November 1999, Vol. 82(11)

Journal articles
Open Access
Where do problems come from?, TAPPI JOURNAL, November 1999, Vol. 82(11)

Where do problems come from?, TAPPI JOURNAL, November 1999, Vol. 82(11)

Journal articles
Open Access
Black liquor gasification: a combination approach, TAPPI JOURNAL, November 1999, Vol. 82(11)

Black liquor gasification: a combination approach, TAPPI JOURNAL, November 1999, Vol. 82(11)

Journal articles
Open Access
Assessing lignin content in Nordic hardwood and softwood species using models based on near-infrared (NIR) spectral data and partial least squares regression (PLSR), TAPPI Journal September 2025

ABSTRACT: Continuous kraft cooking digesters face challenges affecting product quality, making it valuable to improve control through advanced techniques like near-infrared (NIR) spectroscopy, model predictive control, and machine learning models. The primary goal of this study was to use NIR spectra to predict the amount of lignin in hardwood and softwood samples. This study investigated the correlation of NIR derivative spectra with the amounts of lignin relative to other constituents, namely cellulose, hemicellulose, and water, in wood chip samples of varying chip sizes and shapes from six Nordic wood species. It employed partial least squares regression (PLSR) on the NIR data to construct a model that predicted the lignin fraction and the relative fraction of acid-soluble lignin. When trained on a group of five wood species, the model achieved a satisfactory predictive ability, striking a balance between a wide range of lignin content and a consistent chemical environment. The accuracy increased further when the model was restricted only to spruce and pine, reflecting the benefits of a more homogenous dataset. Additionally, the optimal number of latent variables was identified as two, indicating that three distinct chemical components — cellulose, lignin and water — can be effectively differentiated using NIR.

Journal articles
Open Access
Qualification of Welding Procedures for Duplex Stainless Ste

Qualification of Welding Procedures for Duplex Stainless Steels, 1999 Engineering Conference Proceedings

Journal articles
Open Access
Paper science and engineering programs - a comparison of the curricula, TAPPI JOURNAL, October 1998, Vol.81(10)

Paper science and engineering programs - a comparison of the curricula, TAPPI JOURNAL, October 1998, Vol.81(10)

Journal articles
Open Access
High-yield pulping of jack pine, TAPPI JOURNAL, October 1998, Vol.81(10)

High-yield pulping of jack pine, TAPPI JOURNAL, October 1998, Vol.81(10)

Journal articles
Open Access
Optimization of combustion air delivery, TAPPI JOURNAL, September 1998, Vol. 81(9)

Optimization of combustion air delivery, TAPPI JOURNAL, September 1998, Vol. 81(9)

Journal articles
Open Access
Effect of char bed temperature and temperature distribution on fume generation in a kraft recovery boiler, TAPPI JOURNAL, September 1998, Vol. 81(9)

Effect of char bed temperature and temperature distribution on fume generation in a kraft recovery boiler, TAPPI JOURNAL, September 1998, Vol. 81(9)

Journal articles
Open Access
Detailed black liquor drop combustion model for predicting fume in kraft recovery boilers, TAPPI JOURNAL, September 1998, Vol. 81(9)

Detailed black liquor drop combustion model for predicting fume in kraft recovery boilers, TAPPI JOURNAL, September 1998, Vol. 81(9)

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