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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
Editorial: Gaurav Pranami: Nonwovens and coatings R&D expert, TAPPI JOURNAL November 2014

Editorial: Gaurav Pranami: Nonwovens and coatings R&D expert, TAPPI JOURNAL November 2014

Journal articles
Open Access
Fundamental study on developing wood powder as an additive of paperboard, TAPPI JOURNAL November 2014

Fundamental study on developing wood powder as an additive of paperboard, TAPPI JOURNAL November 2014

Journal articles
Open Access
The potential of fly ash-based calcium silicate as paper filler: Physical properties and printability

The potential of fly ash-based calcium silicate as paper filler: Physical properties and printability, TAPPI JOURNAL October 2014

Journal articles
Open Access
Multistage fiber fractionation of softwood chemical pulp through smooth-hole screen cylinders and its effects on paper properties 15APR259

Multistage fiber fractionation of softwood chemical pulp through smooth-hole screen cylinders and its effects on paper properties, TAPPI JOURNAL April 2015

Journal articles
Open Access
A novel method for the determination of linting propensity of paper, TAPPI JOURNAL October 2012

A novel method for the determination of linting propensity of paper, TAPPI JOURNAL October 2012

Journal articles
Magazine articles
Open Access
Impact of fiber structure on edge-wicking of highly-sized paperboard, TAPPI JOURNAL August 2018

Impact of fiber structure on edge-wicking of highly-sized paperboard, TAPPI JOURNAL August 2018

Journal articles
Open Access
Operational issues in high-speed curtain coating of paper, part 1: the principles of curtain coating, Solutions! & TAPPI JOURNAL, November 2004, Vol. 3(11) (173KB)

Operational issues in high-speed curtain coating of paper, part 1: the principles of curtain coating, Solutions! & TAPPI JOURNAL, November 2004, Vol. 3(11) (173KB)

Journal articles
Open Access
Improvement of paper properties using starch-modified precipitated calcium carbonate filler, TAPPI JOURNAL & Solutions! February 2005, Vol. 4(2) (304KB)

Improvement of paper properties using starch-modified precipitated calcium carbonate filler, TAPPI JOURNAL & Solutions! February 2005, Vol. 4(2) (304KB)

Journal articles
Open Access
The effect of pulp refining on lateral and transverse moisture diffusion in paper, TAPPI JOURNAL, December 2005, Vol. 4(12) (520 KB)

The effect of pulp refining on lateral and transverse moisture diffusion in paper, TAPPI JOURNAL, December 2005, Vol. 4(12) (520 KB)

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