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Journal articles
Magazine articles
Open Access
Flow characteristics of drag-reducing natural bamboo fiber suspensions with minimal environmental load, TAPPI Journal September 2019

ABSTRACT: The reduction of pipe friction loss by adding drag-reducing agents has attracted attention as an aid to energy conservation. Drag-reducing agents induce drag reduction (DR) effects and should have a minimal environmental load, with natural resource-saving potential. This study demonstrates bamboo fiber as a drag-reducing agent that saves natural resources and has a low environmental load. Using pressure drop measurements, we report DR with suspensions of bamboo fibers with the average diameter of 13.3 µm and aspect ratio of 98.7. The maximum DR obtained in this experiment is 43% at the concentration of 4000 ppm and pipe diameter of 30 mm; DR is affected by the Reynolds number, suspension concentration, and pipe diameter. In addition, the bamboo fibers can be easily removed from the suspensions by filtration. We found that low-environmental-load bamboo fiber has DR effects like those of other fibers; its effects are greater than those of conventional synthetic fibers and wood pulp. Furthermore, it is resistant to mechanical degradation, recoverable, and recyclable. Therefore, DR effects can be selectively obtained by adding the fibers only when DR is needed; the fibers can then be collected when DR is no longer necessary. This method might greatly expand the application range of DR agents. The results demonstrate the usefulness of bamboo fibers as DR additives.

Journal articles
Magazine articles
Open Access
A novel unit operation to remove hydrophobic contaminants, TAPPI Journal April 2020

ABSTRACT: For mills making paper with recovered fiber, removal of hydrophobic contaminants is essential for trouble-free operation of paper machines. Significant cost savings on paper machine operation can be achieved by reducing deposits, which results in better quality, reduced downtime, increased fiber yield, and reduced energy consumption. Bubble nucleation separation (BNS) is a relatively new process for removing hydrophobic particles. When vacuum is applied to a slurry, dissolved gas bubbles nucleate on hydrophobic particles and drag them to the surface for easy removal. We constructed a 16-L batch unit to evaluate the effect of operating parameters on removal of hydrophobic particles, using statistical design of experiments. These results were used to guide our design of a 16-L continuous unit. We tested this unit on laboratory and mill samples. The removal of 60%•80% of hydrophobic particles was achieved with a low reject rate of < 2%.Following on this success, we built a 200-L pilot unit and tested it in our pilot plant. With promising results there, we installed the pilot unit at a commercial paper recycling mill. Over the course of several mill trials, we showed that it was possible to remove a considerable amount of suspended solids from paper machine white water with less than 2% rejects. Unfortunately, due to the unit only treating 50 L/min and the mill flow being 12000 L/min, we were not able treat a sufficient portion of the white water to know whether a large-scale implementation of BNS would improve paper machine runnability.

Journal articles
Open Access
Prediction of Handsheet Tensile Strength by Computational Simulation of Structure, TAPPI JOURNAL January 2010

Prediction of Handsheet Tensile Strength by Computational Simulation of Structure, TAPPI JOURNAL January 2010

Journal articles
Open Access
Characterizing Carbonaceous Biochemical Oxygen Demand Load Reductions from Pulp and Paper Mills for Activities Related to Total Maximum Daily Loads, TAPPI JOURNAL January 2009

Characterizing Carbonaceous Biochemical Oxygen Demand Load Reductions from Pulp and Paper Mills for Activities Related to Total Maximum Daily Loads, TAPPI JOURNAL January 2009

Journal articles
Open Access
Influence of machine-side filaments and jet-to-wire speed ratio on the flow through of a forming fabric, TAPPI JOURNAL July 2010

Influence of machine-side filaments and jet-to-wire speed ratio on the flow through of a forming fabric, TAPPI JOURNAL July 2010

Journal articles
Magazine articles
Open Access
Editor's Note: An Ideal Raw Material for Pulp and Paper, TAP

Editor's Note: An Ideal Raw Material for Pulp and Paper, TAPPI JOURNAL March 2010

Journal articles
Open Access
Impact of High-Yield Pulp Substitution on the Brightness Stability of Uncoated Wood-Free Paper, TAPPI JOURNAL March 2010

Impact of High-Yield Pulp Substitution on the Brightness Stability of Uncoated Wood-Free Paper, TAPPI JOURNAL March 2010

Journal articles
Open Access
Use of talc to control problems associated with dissolved and colloidal material in papermaking, TAPPI JOURNAL February 2012

Use of talc to control problems associated with dissolved and colloidal material in papermaking, TAPPI JOURNAL February 2012

Journal articles
Open Access
Analysis of the shortness of offset ink as a function of tack on paper by comparing elastic and Hencky strain extension, TAPPI JOURNAL August 2011

Analysis of the shortness of offset ink as a function of tack on paper by comparing elastic and Hencky strain extension, TAPPI JOURNAL August 2011

Journal articles
Open Access
Characterization of printed offset ink layers on printing papers using fractal analysis, TAPPI JOURNAL May 2012

Characterization of printed offset ink layers on printing papers using fractal analysis, TAPPI JOURNAL May 2012

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