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Magazine articles
Polymers, Laminations and Coatings Conference Heads West - A
Polymers, Laminations and Coatings Conference Heads West - Again, TAPPI JOURNAL, January 1999, Vol. 83(5)
Magazine articles
1999 environmental conference emphasizes quality management,
1999 environmental conference emphasizes quality management, TAPPI JOURNAL, July 1999, Vol. 82(7)
Magazine articles
Corrosion in fluidized bed boilers burning potassium and chlorine containing fuels, TAPPI JOURNAL, June 1999, Vol. 82(6)
Corrosion in fluidized bed boilers burning potassium and chlorine containing fuels, TAPPI JOURNAL, June 1999, Vol. 82(6)
Magazine articles
A look back - 50 years of publishing tappi's magazine, TAPPI
A look back - 50 years of publishing tappi's magazine, TAPPI JOURNAL, June 1999, Vol. 82(6)
Magazine articles
1998 tappi pulping conference, TAPPI JOURNAL, March 1999, Vo
1998 tappi pulping conference, TAPPI JOURNAL, March 1999, Vol. 82(3)
Magazine articles
Chromizing for near-drum corrosion protection, TAPPI JOURNAL, September 1999, Vol. 82(9)
Chromizing for near-drum corrosion protection, TAPPI JOURNAL, September 1999, Vol. 82(9)
Magazine articles
Paper kayaks test engineering theories, TAPPI JOURNAL, Septe
Paper kayaks test engineering theories, TAPPI JOURNAL, September 1999, Vol. 82(9)
Magazine articles
Leveraging mill-wide big data sets for process and qualityimprovement in paperboard production, TAPPI Journal December 2024
Authors: Jianzhong Fu and Peter W. Hart | TAPPI J. 15(5): 309(2016) - ABSTRACT: The MWV mill in Covington, VA, USA, experienced a long term trend of increasing episodes of paper indents that resulted in significant quantities of internal rejects and production downtime. When traditional troubleshooting techniques failed to resolve the problem, big data analysis techniques were employed to help deter-mine root causes of this negative and increasingly frequent situation. Nearly 6000 operating variables were selected for a deep dive, multi-year analysis after reviewing mill-wide process logs and 60000+ PI tags (data points) collected from one of the major data historian systems at the MWV Covington mill. Nine billion data points were collected from November 2011 to August 2014. Strategies and methods were developed to format, clean, classify, and sort the various data sets to compensate for process lag time and to align timestamps, as well as to rank potential causes or indicators. GE Intelligent Platforms software was employed to develop decision trees for root cause analysis. Insights and possible correlations that were previously invisible or ignored were obtained across the mill, from pulp-ing, bleaching, and chemical recovery to the papermaking process. Several findings led the mill to revise selected process targets and to reconsider a step change in the drying process. These changes have exhibited significant impacts on the mill’s product quality, cost, and market performance. Mill-wide communications of the identified results helped transform the findings into executable actions. Several projects were initiated.
Journal articles
Magazine articles
Understanding the risks and rewards of using 50% vs. 10% strength peroxide in pulp bleach plants,TAPPI Journal December 2024
Authors: Alan W. Rudie and Peter W. Hart | TAPPI J. 17(11): 601(2018) - ABSTRACT: The use of 50% concentration and 10% concentration hydrogen peroxide were evaluated for chemical and mechanical pulp bleach plants at storage and at point of use. Several dangerous occurrences have been documented when the supply of 50% peroxide going into the pulping process was not stopped during a process failure. Startup conditions and leaking block valves during maintenance outages have also contributed to explosions. Although hazardous events have occurred, 50% peroxide can be stored safely with proper precautions and engineering controls. For point of use in a chemical bleach plant, it is recommended to dilute the peroxide to 10% prior to application, because risk does not outweigh the benefit. For point of use in a mechanical bleach plant, it is recommended to use 50% peroxide going into a bleach liquor mixing system that includes the other chemicals used to maintain the brightening reaction rate. When 50% peroxide is used, it is critical that proper engineering controls are used to mitigate any risks.