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Creasing severity and reverse-side cracking, TAPPI Journal April 2020
ABSTRACT: Crease cracking can be detrimental to the functionality and appearance of paperboard-based packaging. The effect of creasing severity on the degree of reverse-side crease cracking (bead-side of the crease) of paperboard was investigated. Samples were creased with a range of rule and channel geometries, and the cracking degree was quantified as the percent of cracked length relative to the total length of the crease. The cracking degree was typically below 5% at low crease penetration depths, but was exponentially higher beyond a critical penetration depth. A rule and channel combination with a wider clearance shifted the critical depth to larger values. The creasing severity parameter, termed the creasing draw, converged the cracking degree data from different rule and channel combinations to a single curve. The creasing draw was derived from the same analytical expres-sions as the transverse shear strain and quantifies the length of paper that is drawn into the channel during creasing. The critical draw is defined as the draw at which cracking becomes greater than 5%, which corresponds with the point at which cracking becomes exponential. The critical draw is a material/system parameter that defines the level below which cracking is minimal.
Journal articles
Magazine articles
Editorial: Risks and rewards of research during a pandemic, TAPPI Journal August 2020
ABSTRACT: For universities and research institutions, the arrival of Covid-19 last spring halted activities around the world while exposing the need for detailed Public Health Emergency (PHE) plans to cope with a highly-contagious virus in laboratory and classroom settings. As classroom work switched to online platforms like Zoom, the reality set in that long-term plans were needed to safely keep students learning, research flowing, and universities financially stable.
Journal articles
Magazine articles
Modeling of the energy of a smelt-water explosion in the recovery boiler dissolving tank, TAPPI Journal August 2020
ABSTRACT: The explosion energy generated as molten smelt droplets interact with water was evaluated as a function of smelt distribution, water temperature, and smelt temperature using a thermodynamic model. The results show that increasing smelt-to-water volume ratio and water temperature significantly increases the explosion energy, converting a larger proportion of the thermal energy of smelt into mechanical work. To reduce the chance of violent smelt-water explosions, it is important to: i) optimize the shatter jet design and operation to uniformly distribute the smelt over a large area in the dissolving tank; ii) avoid high green liquor temperature and ensure adequate liquor mixing; and iii) avoid upsets that may cause heavy smelt runoff or jellyroll smelt.
Journal articles
Editorial: Revisiting recycling forums past, TAPPI JOURNAL J
Editorial: Revisiting recycling forums past, TAPPI JOURNAL January 2016
Journal articles
Press wetting as an enhanced wetting method for baled OCC ma
Press wetting as an enhanced wetting method for baled OCC material, TAPPI JOURNAL January 2016
Journal articles
Factors influencing polymeric granule-assisted dispersion of
Factors influencing polymeric granule-assisted dispersion of ultraviolet ink, TAPPI JOURNAL January 2016
Journal articles
Falling impact as an isolated disintegration mechanism in d
Falling impact as an isolated disintegration mechanism in drum pulping for packaging board, TAPPI JOURNAL January 2016
Journal articles
Removal of mineral oil during recovered paper processing, T
Removal of mineral oil during recovered paper processing, TAPPI JOURNAL January 2016
Journal articles
Study on neutral chemical deinking of laser printed papers,
Study on neutral chemical deinking of laser printed papers, TAPPI JOURNAL January 2016
Journal articles
Commissioning Brownstock Washing Controls for an Evaporator
Commissioning Brownstock Washing Controls for an Evaporator Limited Mill, TAPPI JOURNAL July 2016