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Journal articles
Open Access
Editorial: TAPPI Journal eBook version offers easy content, TAPPI Journal September 2025

Many readers of TAPPI Journal are familiar with accessing the PDF version of our published research papers, but not all are familiar with the availability and functionality of our eBook version. As opposed to the traditional PDF format, which is a static digital replica of the paper, the eBook version offers a range of additional benefits that make the content more dynamic, accessible, and user-friendly. In addition, you can more easily review all papers in a particular issue much as you could in a print version, as opposed to opening multiple PDFs. Below are some highlights on accessing and making the most of the eBook version.

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
Industrial Lo-Solids Pulp Digester Simulation by the Purdue Model, TAPPI JOURNAL April 2009

Industrial Lo-Solids Pulp Digester Simulation by the Purdue Model, TAPPI JOURNAL April 2009

Journal articles
Open Access
Comparison of Various Hardwood Kraft Pulp Pre-Bleaching Techniques, TAPPI JOURNAL April 2009

Comparison of Various Hardwood Kraft Pulp Pre-Bleaching Techniques, TAPPI JOURNAL April 2009

Journal articles
Open Access
Modified Egyptian Talc as Internal and Surface Treatments for Papermaking, TAPPI JOURNAL April 2009

Modified Egyptian Talc as Internal and Surface Treatments for Papermaking, TAPPI JOURNAL April 2009

Journal articles
Open Access
The Relationship Between Tack and Linting in Offset Printing of Newsprint Grades, TAPPI JOURNAL August 2009

The Relationship Between Tack and Linting in Offset Printing of Newsprint Grades, TAPPI JOURNAL August 2009

Journal articles
Open Access
Optimization of ECF Bleaching of Kraft Pulp: II. Effects of Acid Prehydrolysis on Hardwood Pulp Bleachability, TAPPI JOURNAL August 2009

Optimization of ECF Bleaching of Kraft Pulp: II. Effects of Acid Prehydrolysis on Hardwood Pulp Bleachability, TAPPI JOURNAL August 2009

Journal articles
Open Access
Aggregation of Colloidal Material in Recycling Process Water, TAPPI JOURNAL August 2009

Aggregation of Colloidal Material in Recycling Process Water, TAPPI JOURNAL August 2009

Journal articles
Open Access
Effect of High-Temperature Drying of Recycled Paper on Heat Transfer Rates and Sheet Properties, TAPPI JOURNAL August 2009

Effect of High-Temperature Drying of Recycled Paper on Heat Transfer Rates and Sheet Properties, TAPPI JOURNAL August 2009

Journal articles
Open Access
Eucalyptus Wood Quality and its Impact on Kraft Pulp Product

Eucalyptus Wood Quality and its Impact on Kraft Pulp Production and Use, TAPPI JOURNAL August 2009

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