Search
Use the search bar or filters below to find any TAPPI product or publication.
Filters
Content Type
Publications
Level of Knowledge
Committees
Collections
Journal articles
Hardwood pulping kinetics of bulk and residual phases, TAPPI JOURNAL October 2015
Hardwood pulping kinetics of bulk and residual phases, TAPPI JOURNAL October 2015
Journal articles
Quantification of lignin-carbohydrate complexes in hardwood pulps, Part 2: Effects of bleaching chemicals, TAPPI JOURNAL October 2015
Quantification of lignin-carbohydrate complexes in hardwood pulps, Part 2: Effects of bleaching chemicals, TAPPI JOURNAL October 2015
Magazine articles
Editor's Note: Monstrous marvels, TAPPI JOURNAL September 20
Editor's Note: Monstrous marvels, TAPPI JOURNAL September 2010
Journal articles
Co-firing black liquor and biomass in a laboratory single droplet reactor â?¢ effects on emissions and combustion characteristics, TAPPI JOURNAL September 2010
Co-firing black liquor and biomass in a laboratory single droplet reactor • effects on emissions and combustion characteristics, TAPPI JOURNAL September 2010
Journal articles
Global survey on lime kiln operation, energy consumption, and alternative fuel usage, TAPPI JOURNAL August 2011
Global survey on lime kiln operation, energy consumption, and alternative fuel usage, TAPPI JOURNAL August 2011
Journal articles
Selectivity of oxygen delignification for southern softwood kraft pulps with high lignin content, TAPPI JOURNAL August 2011
Selectivity of oxygen delignification for southern softwood kraft pulps with high lignin content, TAPPI JOURNAL August 2011
Journal articles
Pretreatment to improve adsorption and effectiveness of wet end chemicals for a bleached chemithermomechanical pulp, TAPPI JOURNAL August 2011
Pretreatment to improve adsorption and effectiveness of wet end chemicals for a bleached chemithermomechanical pulp, TAPPI JOURNAL August 2011
Journal articles
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
Effects of D0-stage temperature, pH, and kappa factor on chl
Effects of D0-stage temperature, pH, and kappa factor on chlorine dioxide decomposition and D0-(EP)-D1 bleaching performance for eucalypt pulps, TAPPI JOURNAL April 2016
Journal articles
Magazine articles
Use of fines-enriched chemical pulp to increase CTMP strength, TAPPI Journal April 2021
ABSTRACT: In this study, fines-enriched pulp (FE-pulp)—the fine fraction of highly-refined kraft pulp—was benchmarked against highly-refined kraft pulp (HRK-pulp) as a strength agent in eucalyptus chemithermomechanical pulp (CTMP). Both the FE-pulp and the HRK-pulp were produced from unbleached softwood kraft pulp, and equal amounts of those strength agents were added to the original CTMP, as well as to washed CTMP, where most of the fines had been removed. The effects of the added strength agents were evaluated with laboratory handsheets.The FE-pulp proved to be twice as effective as HRK-pulp. Both HRK-pulp and FE-pulp increased the strength of the CTMP handsheets. The bulk of the handsheets decreased, however, as well as the drainability. The addition of 5% FE-pulp resulted in the same strength increase as an addition of 10% HRK-pulp, as well as the same decrease in bulk and CSF. For the handsheets of washed CTMP, the strengths were not measurable; the CTMP lost the sheet strength when the CTMP-fines content was reduced through washing. The reduced strength properties were compensated for by the addition of chemical pulp fines that proved to be an efficient strength agent. The addition of 5% FE-pulp restored the strength values, and at a higher bulk and higher drainability.