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Z-direction chemical analysis for new application methods, TAPPI Journal January 2023
ABSTRACT: In conventional wet-end chemical addition during paper production, chemical distribution through the z-direction of the sheet is usually not considered an important characteristic. With a nontraditional chemical dosing approach, such as foam-assisted additive addition, the chemistry can appear at different concentrations throughout the sheet, typically in a z-direction gradient. To fully understand the strength properties of the sheet, it is helpful to view or quantify the chemical distribution through the sheet in the z-direction. One qualitative method uses a dye technique along with confocal laser scanning microscopy to generate an image where the relative chemical concentration can be observed. A quantitative method involves compiling nitrogen analyses of layered subsections of the sheet into a composite graph of relative chemical concentration vs. the z-direction of the sheet. Chemical distribution analysis can be paired with traditional z-direction strength tests, such as Scott bond and z-direction tensile, to help one understand and improve the chemical addition process and its effects.
Identification of Sheet Hole and Defects in Newsprint Mills, 1997 Newsprint Forum Proceedings
Identification of Sheet Hole and Defects in Newsprint Mills, 1997 Newsprint Forum Proceedings
Selecting the Most Effective Chemistry to Clean Paper Machin
Selecting the Most Effective Chemistry to Clean Paper Machine Fabrics, 1994 Papermakers Conference Proceedings
Analysis of Alkyl Ketene Dimer (AKD) by Potentiometric Titration, 1994 Papermakers Conference Proceedings
Analysis of Alkyl Ketene Dimer (AKD) by Potentiometric Titration, 1994 Papermakers Conference Proceedings
Clean Technology Papermaking with Less Water and Energy, 1999 Environmental Conference Proceedings
Clean Technology Papermaking with Less Water and Energy, 1999 Environmental Conference Proceedings
Process Stewardship - Beyond Mill-Wide Systems for Survival
Process Stewardship - Beyond Mill-Wide Systems for Survival in the 90s, 1992 Process Control, Electrical & Info. Conference Proceedings
Water Pinch Application for a Deink Mill Case Study, 1999 Pulping Conference Proceedings
Water Pinch Application for a Deink Mill Case Study, 1999 Pulping Conference Proceedings
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Enhancing Pulp and Paper Mill Sustainability: A Case Study on John Crane’s Innovative Universal Cartridge Seal and Upstream Pumping Technology
Sponsored by: John Crane
Journal articles
Designing paper and board barrier constructions for food contact applications, TAPPI Journal November 2025
ABSTRACT: This study examines the effect of multiple factors on barrier performance for purpose-built paper and paperboard constructions produced on an industrial pilot coater machine. Impacts from precoat latex chemistry, application method (flooded nip with bevel blade, jet with bevel blade, and pre-metered film coater, laboratory rod drawdown) and precoating calendering were studied in relation to resulting porosity, roughness, and barrier (liquid water, moisture, and oil). Results reveal a complex interaction between controllable and uncontrollable factors, offering insight for designing advanced barrier coatings on cellulosic substrates.
Journal articles
Improved barrier performance with microfibrillated cellulose, TAPPI Journal March 2025
ABSTRACT: In this work, the impact of microfibrillated cellulose (MFC) on the properties of water-based barrier coatings intended for food packaging have been explored. Commercially available MFC was used for improving the rheology and water retention of three different commercially available dispersion coatings (acrylic, styrene acrylic, and polylactic acid). Coatings were applied by rod to paper, and barrier properties were tested by measuring air permeability and water barrier properties. Results clearly showed that addition of MFC to water-based dispersion coatings improved the barrier performance of the final coatings.