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Combining Chlorine Dioxide and Molybdate Catalyzed Hydrogen Peroxide for Improved Delignification of Canadian Hardwood and Softwood Pulp, 2011 International Pulp Bleaching Conference
Combining Chlorine Dioxide and Molybdate Catalyzed Hydrogen Peroxide for Improved Delignification of Canadian Hardwood and Softwood Pulp, 2011 International Pulp Bleaching Conference
Experimental and theoretical study of the flow in the manifold of a curtain coater, 2010 TAPPI Advanced Coating Fundamentals Symposium
Experimental and theoretical study of the flow in the manifold of a curtain coater, 2010 TAPPI Advanced Coating Fundamentals Symposium
TCF bleaching character of Soda-anthraquinone pulp from oil palm frond, 2011 International Pulp Bleaching Conference
TCF bleaching character of Soda-anthraquinone pulp from oil palm frond, 2011 International Pulp Bleaching Conference
Conference papers
Development and Application of an Object-Oriented Simulation Tool for Kraft Recovery Processes, 2018 PEERS
Development and Application of an Object-Oriented Simulation Tool for Kraft Recovery Processes, 2018 PEERS
Journal articles
Magazine articles
Understanding the risks and rewards of using 50% vs. 10% strength peroxide in pulp bleach plants, TAPPI Journal November 2018
Authors: Alan W. Rudie and Peter W. Hart | 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.
Journal articles
Magazine articles
Rethinking the paper cup — beginning with extrusion process optimization for compostability and recyclability, TAPPI Journal June 2021
ABSTRACT: More than 50 billion disposable paper cups used for cold and hot beverages are sold within the United States each year. Most of the cups are coated with a thin layer of plastic — low density polyethylene (LDPE) — to prevent leaking and staining. While the paper in these cups is both recyclable and compostable, the LDPE coat-ing is neither. In recycling a paper cup, the paper is separated from the plastic lining. The paper is sent to be recycled and the plastic lining is typically sent to landfill. In an industrial composting environment, the paper and lining can be composted together if the lining is made from compostable materials. Coating paper cups with a compostable performance material uniquely allows for used cups to be processed by either recycling or composting, thus creating multiple pathways for these products to flow through a circular economy.A segment of the paper converting industry frequently uses an extrusion grade of polylactic acid (PLA) for zero-waste venues and for municipalities with ordinances for local composting and food service items. The results among these early adopters reveal process inefficiencies that elevate manufacturing costs while increasing scrap and generally lowering output when using PLA for extrusion coating. NatureWorks and Sung An Machinery (SAM) North America researched the extrusion coating process utilizing the incumbent polymer (LDPE) and PLA. The trademarked Ingeo 1102 is a new, compostable, and bio-based PLA grade that is specifically designed for the extrusion coating process. The research team identified the optimum process parameters for new, dedicated PLA extrusion coating lines. The team also identified changes to existing LDPE extrusion lines that processors can make today to improve output.The key finding is that LDPE and PLA are significantly different polymers and that processing them on the same equipment without modification of systems and/or setpoints can be the root cause of inefficiencies. These polymers each have unique processing requirements with inverse responses. Fine tuning existing systems may improve over-all output for the biopolymer without capital investment, and this study showed an increase in line speed of 130% by making these adjustments. However, the researchers found that highest productivity can be achieved by specifying new systems for PLA. A line speed increase to more than 180% and a reduction in coat weight to 8.6 µm (10.6 g/m2 or 6.5 lb/3000 ft2) was achieved in this study. These results show that Ingeo 1102 could be used as a paper coating beyond cups.
Closing the Water Cycle of Pulp Mills by Evaporating Bleaching and Debarking Effluents, 1997 Minimum Effluent Mills Symposium Proceedings
Closing the Water Cycle of Pulp Mills by Evaporating Bleaching and Debarking Effluents, 1997 Minimum Effluent Mills Symposium Proceedings
The Effect of Dissolved Organics Substances on the Distribution of Metal Ions in a Pulp Suspension, 2004 Engineering, Pulping, and PCE&I Conference
The Effect of Dissolved Organics Substances on the Distribution of Metal Ions in a Pulp Suspension, 2004 Engineering, Pulping, and PCE&I Conference
Application of a Solids Deposition Model to Control Falling Film Evaporator 'Crashing', 1997 Pulping Conference Proceedings
Application of a Solids Deposition Model to Control Falling Film Evaporator 'Crashing', 1997 Pulping Conference Proceedings