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Magazine articles
Open Access
Editor's Note: Jim Atkins: Technology, training & transition

Editor's Note: Jim Atkins: Technology, training & transition, TAPPI JOURNAL September 2011

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.

Magazine articles
Open Access
A financial analysis of north american pulp and paper companies, TAPPI JOURNAL, July 2000, Vol. 83(7)

A financial analysis of north american pulp and paper companies, TAPPI JOURNAL, July 2000, Vol. 83(7)

Magazine articles
Open Access
Global multi-pigment savvy from imerys, TAPPI JOURNAL, June 2000, Vol. 83(6)

Global multi-pigment savvy from imerys, TAPPI JOURNAL, June 2000, Vol. 83(6)

Magazine articles
Open Access
Vendor, supplier, or partner, TAPPI JOURNAL, June 2000, Vol. 83(6)

Vendor, supplier, or partner, TAPPI JOURNAL, June 2000, Vol. 83(6)

Magazine articles
Open Access
Managing technology - a critical contribution to competitiveness, TAPPI JOURNAL, June 2000, Vol. 83(6)

Managing technology - a critical contribution to competitiveness, TAPPI JOURNAL, June 2000, Vol. 83(6)

Magazine articles
Open Access
Bay state paper company: a mill that reinvented itself, TAPPI JOURNAL, March 2000, Vol. 83(3)

Bay state paper company: a mill that reinvented itself, TAPPI JOURNAL, March 2000, Vol. 83(3)

Magazine articles
Open Access
Technology utilization in mills, TAPPI JOURNAL, March 2000, Vol. 83(3)

Technology utilization in mills, TAPPI JOURNAL, March 2000, Vol. 83(3)

Magazine articles
Open Access
Mount st. helens - 20 years of recovery, TAPPI JOURNAL, May 2000, Vol. 83(5)

Mount st. helens - 20 years of recovery, TAPPI JOURNAL, May 2000, Vol. 83(5)

Magazine articles
Open Access
Imagine more in coatings, TAPPI JOURNAL, May 2000, Vol. 83(5)

Imagine more in coatings, TAPPI JOURNAL, May 2000, Vol. 83(5)

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