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Journal articles
Open Access
Making the right choices for successful bagasse newsprint production: part 1, TAPPI JOURNAL, December 1992, Vol. 75(12)

Making the right choices for successful bagasse newsprint production: part 1, TAPPI JOURNAL, December 1992, Vol. 75(12)

Journal articles
Open Access
Newsprint from blends of kenaf ctmp and deinked recycled newsprint, TAPPI JOURNAL, December 1992, Vol. 75(12)

Newsprint from blends of kenaf ctmp and deinked recycled newsprint, TAPPI JOURNAL, December 1992, Vol. 75(12)

Journal articles
Open Access
Rating musanga cecropioides and delonix regia as papermaking hardwoods, TAPPI JOURNAL, December 1992, Vol. 75(12)

Rating musanga cecropioides and delonix regia as papermaking hardwoods, TAPPI JOURNAL, December 1992, Vol. 75(12)

Journal articles
Open Access
Bleaching with enzymes instead of chlorine - mill trials, TAPPI JOURNAL, December 1992, Vol. 75(12)

Bleaching with enzymes instead of chlorine - mill trials, TAPPI JOURNAL, December 1992, Vol. 75(12)

Journal articles
Open Access
Chlorine-free bleaching process of kraft pulp using treatment with fungus izu-154, TAPPI JOURNAL, December 1992, Vol. 75(12)

Chlorine-free bleaching process of kraft pulp using treatment with fungus izu-154, TAPPI JOURNAL, December 1992, Vol. 75(12)

Journal articles
Open Access
The Impact of xylanase on bleaching of kraft pulps, TAPPI JOURNAL, December 1992, Vol. 75(12)

The Impact of xylanase on bleaching of kraft pulps, TAPPI JOURNAL, December 1992, Vol. 75(12)

Journal articles
Open Access
Biological control of pitch in pulp and paper production by ophiostoma piliferum, TAPPI JOURNAL, December 1992, Vol. 75(12)

Biological control of pitch in pulp and paper production by ophiostoma piliferum, TAPPI JOURNAL, December 1992, Vol. 75(12)

Journal articles
Magazine articles
Open Access
Utilization of palm fiber as papermaking materials: Microscopic structure and chemical pulping, TAPPI Journal October 2022

ABSTRACT: The microscopic structure and pulping properties of palm fiber were explored. Soda cooking and sulfate cooking were conducted and compared in terms of physical strength of the obtained pulps. Sulfate pulp showed better performance than soda pulp, as indicated by the 23% higher tensile index, 49% higher tear index, and 36% higher burst index. To further elevate physical strength, long fibered pulp (LFP), namely commercial softwood sulfate pulp, was mixed with sulfate pulp of palm fiber at levels from 20% to 50%. At the blend level of 50%, tensile index of 52.13 Nœm/g, tear index of 15.63 mNœm2/g, and burst index of 3.42 kPaœm2/g were attained. The lignin in spent liquor from pulping was isolated and characterized. Soda lignin of palm fiber was mainly composed of guaiacyl and syringyl units, and showed weight-average molecular weight of 3616 g/mol.

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
Magazine articles
Open Access
Effects of different soda loss measurement techniques on brownstock quality, TAPPI Journal July 2024

ABSTRACT: The efficiency of the kraft recovery plant, bleaching process, and paper machine are affected when black liquor carryover from the brownstock washers is not controlled well. Measuring soda loss within a mill can vary from using conductivity, either in-situ or with a lab sample of black liquor filtrate squeezed from the last stage washer, to measuring absolute sodium content with a lab sodium specific ion probe or spectrophotometer. While measuring conductivity has value in tracking trends in black liquor losses, it is not an acceptable method in reporting losses in absolute units, typically in lb/ton of pulp. This is further complicated when trying to benchmark soda loss performance across a fleet of mills with multiple washer lines. Not only do the testing methods vary, but the amount of bound soda on high kappa pulps can be significant. This variability creates inconsistent results, and studies are needed to understand the effect of different testing methods on the pulp quality. In this study, soda loss is expressed as sodium sulfate (Na2SO4). Four different methods to measure soda content in pulp off commercial brownstock washers were studied: full digestion (FD), washing soaking overnight and washing (WSW), soaking in boiling water and stirring 10-min (SW-10), and squeeze-no wash (Sq). Total, washable, and bound sodium sulfate calculations were determined for each soda content measuring technique using inductively coupled plasma-optical emission spectroscopy (ICP-OES). Results showed bound and washable sodium sulfate amounts significantly depend on which soda measurement technique was used. In addition, the soda results were correlated with the pulp kappa numbers. As the kappa number increases, bound soda increases, regardless of the soda measurement method used. Impacts of high sodium sulfate in brownstock are also discussed.

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