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Journal articles
Open Access
Light-scattering efficiency of white pigments: an analysis of model core - shell pigments vs. optimized rutile tio 2, TAPPI JOURNAL, November 1997, Vol. 80(11)

Light-scattering efficiency of white pigments: an analysis of model core - shell pigments vs. optimized rutile tio 2, TAPPI JOURNAL, November 1997, Vol. 80(11)

Journal articles
Open Access
OSHA's voluntary protection program - the rewards are worth the risk, TAPPI JOURNAL, November 1997, Vol. 80(11)

OSHA's voluntary protection program - the rewards are worth the risk, TAPPI JOURNAL, November 1997, Vol. 80(11)

Journal articles
Open Access
OCC pulp fractionation-a comparative study of fractionated and unfractionated stock, TAPPI JOURNAL, Online Exclusive, January 2004, Vol. 3(1) (KB)

OCC pulp fractionation-a comparative study of fractionated and unfractionated stock, TAPPI JOURNAL, Online Exclusive, January 2004, Vol. 3(1) (KB)

Journal articles
Open Access
Machine Vision Applications Using Binary and Grayscale Morph

Machine Vision Applications Using Binary and Grayscale Morphology, 1994 Engineering Conference Proceedings

Journal articles
Magazine articles
Open Access
Pilot scale black liquor concentration using pressure driven membrane separation, TAPPI Journal April 2023

ABSTRACT: Black liquor concentration using pressure driven membrane separation has long been proposed as a means of achieving energy savings and breaking production bottlenecks. To date, limitations in membrane performance and stability under black liquor process conditions have prevented those promises from being realized out-side of tightly controlled laboratory settings. In this work, we describe the first successful pilot scale field deployments of a membrane system for black liquor concentration. Using a purpose-built system and commercial sized, spiral wound graphene oxide membrane elements, we have logged nearly 6000 h of runtime across deployments to multiple mill sites. We demonstrate concentration of black liquor from 14% to >20% total solids, while generating permeate water comparable in quality to that of evaporator condensate and an 81% reduction in energy consumption relative to evaporation. At a commercial scale, these results translate to $2 M/year in net energy savings for a typical mill, as well as an opportunity to support production increases or mill expansions. These results represent a significant leap forward in the ability of membrane systems to deliver substantial value via black liquor concentration.

Journal articles
Magazine articles
Open Access
Evaluation of soap recovery efficiency from black liquor — analytical tools, TAPPI Journal April 2023

ABSTRACT: Soap skimmings (“soap”) are typically recovered from black liquor in kraft mills that process a high percentage of softwood. In many mills, the recovery of soap is inefficient, negatively impacting performance of evaporators and recovery boilers and resulting in loss of potential revenue. A thorough evaluation of soap recovery performance in a kraft mill requires measurement of soap content in black liquor at various sampling locations, especially around the soap skimmer.The standard laboratory method for evaluating soap content in black liquor is a complex, multi-step process that relies on solvent extraction and titration; most mills send these samples to an outside laboratory for this analysis. In this study, 100 black liquor samples, with a wide range of soap concentrations, were tested by the standard solvent extraction method. After additional dilution, each sample was also tested for surface tension with a bubble pressure tensiometer. The results were found to correlate very closely with the solvent extraction tests results. This alternate method, using surface tension measurements of diluted black liquor samples, produces rapid results and can be easily implemented in most kraft mills, which would facilitate much more frequent in-house evaluations of soap recovery performance.

Journal articles
Open Access
A systems approach to consistency control and dry stock blend, TAPPI JOURNAL July 1988

A systems approach to consistency control and dry stock blend, TAPPI JOURNAL July 1988

Journal articles
Magazine articles
Open Access
Application of fuzzy TOPSIS in the Analyze phase of the DMAIC cycle to aid decision-making, TAPPI Journal April 2020

ABSTRACT: This paper reports the use of multicriteria analysis in the Analyze phase of the DMAIC (Define-Measure-Analyze-Improve-Control) cycle for continuous improvement. The research was carried out in a tissue paper factory located in southern Brazil. A sample of 64 parts of 16 different reels of recycled paper was used. A problem regarding paper quality variability was detected, presenting a scrap index ranging between 9% and 23%, compromising machine productivity and product sales. This motivated the implementation of a structured project supported by the application of the DMAIC cycle. The project team (machine operators, maintenance staff, supervisor, and data analyst) defined the evaluation criteria and determined the control intervals and their equivalence with linguistic variables to support the necessary evaluations for the application of fuzzy TOPSIS (Technique for Order of Preference by Similarity to Ideal Solution). The criteria were C1-Longitudinal Strength (Kgf), C2-Longitudinal Elongation (mm), C3-Cross-strength (kgf), C4-Cross-elongation (mm), C5-Weight (g/m²), and C6-Humidity (%). The results showed that samples with the same ranking had the lowest scrap indexes in the subsequent process. Also, the criterion C5 had a more significant impact on the quality of the product than the other criteria, which was determined from the DMAIC sequence. Improvements related to C5 should be prioritized. The fuzzy TOPSIS method presented is a flexible tool, adapting itself to the solution of the problem and contributing to the decision-making process.

Journal articles
Open Access
AOX Content of Paper Manufactured with 'Chlorine Free' Pulps

AOX Content of Paper Manufactured with 'Chlorine Free' Pulps, 1995 Papermakers Conference Proceedings

Journal articles
Open Access
Xylanase Treatment for the Bleaching of Softwood Kraft Pulps

Xylanase Treatment for the Bleaching of Softwood Kraft Pulps: The Effect of Chlorine Dioxide Substitution, 1992 Pulping Conference Proceedings

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