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Journal articles
Magazine articles
Open Access
A new technique for the measurement of show-through mottle of fine paper, TAPPI Journal September 2019

ABSTRACT: Mottling within print-through and show-through is caused by the variability of the local optical properties of the sheet. This mottling is visually disturbing and a mark of poor paper quality. The ability to predict print-through mottle of printed paper by measuring show-through mottle on the unprinted sheet would be a valuable asset for paper machine control.We examined the relationship between print-through mottle and show-through mottle. We worked with nine samples of 60 lb. uncoated fine paper (90 g/m2), from various North American paper companies, that were printed on an offset press, 400K (400% Black), on both sides. A show-through mottle instrumental determination technique was developed using an existing Fast Fourier Transform-based algorithm. The nine samples examined were ranked similarly by the visual evaluation of print-through mottle and by the instrumental determination of show-through mottle. We thus established that show-through on the unprinted sheet can be used as a reliable predictor of print-through, therefore saving time and money for papermakers. We also found a significant two-sidedness in show-through for some of the samples.

Journal articles
Magazine articles
Open Access
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
Open Access
Superhydrophobic paper coating containing nonconventional clay, TAPPI JOURNAL November 2010

Superhydrophobic paper coating containing nonconventional clay, TAPPI JOURNAL November 2010

Journal articles
Open Access
Z-direction fiber orientation in paperboard, TAPPI JOURNAL October 2010

Z-direction fiber orientation in paperboard, TAPPI JOURNAL October 2010

Journal articles
Open Access
Chloroform generation at bleach plants with high chlorine dioxide substitution or oxygen delignification, TAPPI JOURNAL, April 1991, Vol. 74(4)

Chloroform generation at bleach plants with high chlorine dioxide substitution or oxygen delignification, TAPPI JOURNAL, April 1991, Vol. 74(4)

Journal articles
Open Access
Recycling wood fiber in municipal solid wastes: opportunity for government - industry partnership, TAPPI JOURNAL, April 1991, Vol. 74(4)

Recycling wood fiber in municipal solid wastes: opportunity for government - industry partnership, TAPPI JOURNAL, April 1991, Vol. 74(4)

Journal articles
Open Access
On-Line surface treatment to enhance market value, TAPPI JOURNAL, April 1991, Vol. 74(4)

On-Line surface treatment to enhance market value, TAPPI JOURNAL, April 1991, Vol. 74(4)

Journal articles
Open Access
Associative behavior of cellulosic thickeners and its implications on coating structure and rheology, TAPPI JOURNAL, April 1991, Vol. 74(4)

Associative behavior of cellulosic thickeners and its implications on coating structure and rheology, TAPPI JOURNAL, April 1991, Vol. 74(4)

Journal articles
Open Access
The effect of fillers on paper friction properties, TAPPI JOURNAL, April 1991, Vol. 74(4)

The effect of fillers on paper friction properties, TAPPI JOURNAL, April 1991, Vol. 74(4)

Journal articles
Open Access
Vibration analysis is the cornerstone of predictive and preventative maintenance, TAPPI JOURNAL, August 1991, Vol. 74(8)

Vibration analysis is the cornerstone of predictive and preventative maintenance, TAPPI JOURNAL, August 1991, Vol. 74(8)

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