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Journal articles
2015 TAPPI Centennial Celebration, TAPPI JOURNAL 2015 March - 15MAR100
2015 TAPPI Centennial CelebrationHonoring Our Past, Inspiring Our Future, TAPPI JOURNAL March 2015
Journal articles
Review of currently available technology for the conversion of woody biomass o value-added products 15MAR160
Review of currently available technology for the conversion of woody biomass to value-added products, TAPPI JOURNAL March 2015
Journal articles
Facile preparation of nanofiller-paper using mixed office paper without deinking, TAPPI JOURNAL 2015 March - 15MAR167
Facile preparation of nanofiller-paper using mixed office paper without deinking, TAPPI JOURNAL March 2015
Journal articles
Flippr° â?? an industrial research project in Austria, TAPPI JOURNAL 2015 March - 15MAR209
Flippr° â?? an industrial research project in Austria, TAPPI JOURNAL 2015 March - 15MAR209
Journal articles
Guest Editorial: Highlighting the role of fluid mechanics, TAPPI JOURNAL May 2015
Guest Editorial: Highlighting the role of fluid mechanics, TAPPI JOURNAL May 2015
Journal articles
Development of laboratory wet creping method to evaluate and control pulp quality for tissue, TAPPI JOURNAL May 2015
Development of laboratory wet creping method to evaluate and control pulp quality for tissue, TAPPI JOURNAL May 2015
Journal articles
CTMP in Fine Papers: On-Machine Surface Treatments for Impro
CTMP in Fine Papers: On-Machine Surface Treatments for Improved Brightness Stability, 1991 Papermakers Conference Proceedings
Journal articles
Aging and degradation of oil and grease barrier papers coate
ABSTRACT: The long-term performance and stability of bio-based barrier coatings are critical for sustainable packaging. In this study, the aging and degradation of a biobased starch•wax emulsion coating were examined on two different base papers. Coated samples were stored for 8 months at 23°C and 50% relative humidity (RH) in their original reels to minimize external exposure and isolate internal aging effects. Multiple aging intervals were analyzed using advanced methods to assess both chemical composition and physical structure. The water vapor transmission rate (WVTR) of both coated papers increased during the first 15 days, but after eight months, the WVTR dropped below the initial values. Fourier transform infrared (FTIR) results supported these trends by showing a marked rise in the polarity index (PI), occurring predominantly within the first 15 days. The overall observations, including increases in the PI, carbonyl index (CI), and absolute absorbance in the hydroxyl region, confirm that both hydrolysis and oxidation occurred during aging. The gradual increase in the aliphatic C•H stretching peaks indicated that wax components moved toward the surface over time. The non-uniform surface enrichment of oleophilic wax following migration contributed to the decline in Kit rating upon aging by facilitating oil and grease wetting and penetration. At the same time, increased wax concentration at the surface helped improve the water vapor barrier performance during long-term aging. Scanning electron microscopy (SEM) imaging revealed distinct surface cracks over time on the starch-wax emulsion coated papers. The FTIR analysis supported these observations through an increase in the conformational disorder index (CDI) with aging. Physical changes were further reflected in the barrier performance, as the heptane vapor transmission rate (HVTR) increased significantly for both coated papers over the 8-month period.
Journal articles
A novel dimensionless index for optimizing the thermo-hydrau
ABSTRACT: The comprehensive performance of steam condensation in horizontal rotating channels, which involves a trade-off between heat transfer enhancement and flow resistance, lacks a unified evaluation criterion. This deficiency is particularly critical for applications such as a multi-channel cylinder dryer (MCD) in paper machines, where rotational operation enhances drying efficiency. To address this gap, this study introduces a novel dimensionless index, W/Eu, defined as the ratio of the dimensionless heat transfer coefficient (W) to the dimensionless pressure drop (Eu), thereby taking into account both heat transfer and flow resistance characteristics comprehensively. A functional relationship for this index was established with respect to channel spacing (Wr) and steam mass flux (G), followed by a theoretical optimization analysis. The analysis reveals that W/Eu decreases monotonically as Wr increases and increases monotonically as G increases, ultimately diverging as G ™¨ ™‡. Consequently, for any given operational range, the theoretical maximum performance is achieved at the boundary condition of minimum channel spacing (Wr ™¨ 0) and maximum allowable mass flux (G = Gmax). This work provides a clear theoretical directive for the design and optimization of high-efficiency rotating heat exchanger systems, offering valuable insights for enhancing the drying performance of microchannel dryers in paper machines and similar rotary thermal systems.
Journal articles
Magazine articles
Assessing variation in package modeling, TAPPI Journal April 2021
ABSTRACT: Predictions from empirical models are affected by variability in the input parameters for the data set used to build the models. For corrugated boxes, the difference between actual and modeled compression strength creates a real cost associated with box production, often resulting in boxes that may need to be over-designed to compensate for a lack of model precision. No work to date has attempted to assess the limitation in these compression estimates due to input parameter testing variability. In this paper we approach that problem, initially for the McKee equation and then conceptually for other box models. For our industry to do a better job at meeting the needs of our corrugated packaging customers, we need to reduce the variation in the tests we all rely on, particularly for evaluating material strength (edge crush test [ECT]) and package compression performance (box compression test [BCT]).