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Journal articles
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Open Access
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.

Journal articles
Open Access
Developing a New Paradigm for Linerboard Fillers, TAPPI JOURNAL March 2008

Developing a New Paradigm for Linerboard Fillers, TAPPI JOURNAL March 2008

Journal articles
Open Access
Editorial: Jim Niemiec: Product innovation and the industry

Editorial: Jim Niemiec: Product innovation and the industry’s value proposition, TAPPI JOURNAL August 2016

Journal articles
Open Access
Deinking evaluation using near infrared narrow band digital

Deinking evaluation using near infrared narrow band digital image analysis, TAPPI JOURNAL August 2016

Journal articles
Open Access
Effects of silica on chemical recovery in the direct caustic

Effects of silica on chemical recovery in the direct causticization of wheat straw black liquor, TAPPI JOURNAL August 2016

Journal articles
Open Access
Anaerobic treatment to improve sludge recovery at a deinked

Anaerobic treatment to improve sludge recovery at a deinked fiber pulp and paper mill, TAPPI JOURNAL February 2016

Journal articles
Open Access
Editorial: TAPPI JOURNAL’s new online peer review system go

Editorial: TAPPI JOURNAL’s new online peer review system goes live, TAPPI JOURNAL February 2016

Journal articles
Open Access
Characterizing latency removal in mechanical pulping proces

Characterizing latency removal in mechanical pulping processes part I: Kinetics, TAPPI JOURNAL February 2016

Journal articles
Magazine articles
Open Access
Modeling and parameter optimization of the papermaking processes by using regression tree model and full factorial design, TAPPI Journal February 2021

ABSTRACT: One of the major challenges in the pulp and paper industry is taking advantage of the large amount of data generated through its processes in order to develop models for optimization purposes, mainly in the papermaking, where the current practice for solving optimization problems is the error-proofing method. First, the multiple linear regression technique is applied to find the variables that affect the output pressure controlling the gap of the paper sheet between the rod sizer and spooner sections, which is the main cause of paper breaks. As a measure to determine the predictive capacity of the adjusted model, the coefficient of determination (R2) and s values for the output pressure were considered, while the variance inflation factor was used to identify and eliminate the collinearity problem. Considering the same amount of data available by using machine learning, the regression tree was the best model based on the root mean square error (RSME) and R2. To find the optimal operating conditions using the regression tree model as source of output pressure measurement, a full factorial design was developed. Using an alpha level of 5%, findings show that linear regression and the regression tree model found only four independent variables as significant; thus, the regression tree model demonstrated a clear advantage over the linear regression model alone by improving operating conditions and demonstrating less variability in output pressure. Furthermore, in the present work, it was demonstrated that the adjusted models with good predictive capacity can be used to design noninvasive experiments and obtain.

Journal articles
Magazine articles
Open Access
Editorial: Change, reality, and vision in the pulp and paper industry, TAPPI Journal February 2021

ABSTRACT: Change is inevitable and is a constant in our lives. Change is especially evident in this era of whirlwind, revolutionary break-throughs in communication and control technology. If nothing else, the past year has certainly made this clear.

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