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Journal articles
Open Access
Applying enzymes and polymers to enhance the freeness of recycled fiber, TAPPI JOURNAL, February 1995, Vol. 78(2)

Applying enzymes and polymers to enhance the freeness of recycled fiber, TAPPI JOURNAL, February 1995, Vol. 78(2)

Journal articles
Open Access
Water uptake in newsprint during offset printing, TAPPI JOURNAL, January 1995, Vol. 78(1)

Water uptake in newsprint during offset printing, TAPPI JOURNAL, January 1995, Vol. 78(1)

Journal articles
Open Access
Superheated steam drying of paper: effect of sulfonation level, TAPPI JOURNAL, July 1995, Vol. 78(7)

Superheated steam drying of paper: effect of sulfonation level, TAPPI JOURNAL, July 1995, Vol. 78(7)

Journal articles
Open Access
Yankee dryer joint corrosion: cause, prevention, and repair, TAPPI JOURNAL, July 1995, Vol. 78(7)

Yankee dryer joint corrosion: cause, prevention, and repair, TAPPI JOURNAL, July 1995, Vol. 78(7)

Journal articles
Open Access
On the effect of centrifugal force on winding, TAPPI JOURNAL, July 1995, Vol. 78(7)

On the effect of centrifugal force on winding, TAPPI JOURNAL, July 1995, Vol. 78(7)

Journal articles
Open Access
Reducing chlorinated organic compounds from bleached kraft mills through first stage substitution of chlorine dioxide for chlorine, TAPPI JOURNAL, June 1995, Vol. 78(6)

Reducing chlorinated organic compounds from bleached kraft mills through first stage substitution of chlorine dioxide for chlorine, TAPPI JOURNAL, June 1995, Vol. 78(6)

Open Access
Polyvinylamine as a wet-end additive: Effects of pH and anionic contamination, TAPPI Journal May 2024

ABSTRACT: The effects of polyvinylamine (PVAm) on papermaking process attributes and handsheet quality were evaluated for a recycled copy paper furnish in a near neutral-to-alkaline pH range. The degree of protonation of primary amine groups, such as those in PVAm, is known to decrease with increasing pH. Streaming potential tests surprisingly showed that a high treatment level of PVAm on the copy paper furnish was able to maintain a net positive zeta potential up to pH of about 11, whereas charge demand titrations indicated that PVAm maintained its positive charge character up to about pH 10. Favorable dewatering was observed when the furnish had been pretreated with 1% polyacrylate dispersant prior to treatment with PVAm at the 0.5% level, and the mass of filtrate increased slightly with increasing pH. First-pass retention tests showed poor retention efficiency in systems where the furnish had been treated with the dispersant, then PVAm, in an unfavorable pH range of about 9 to 9.5. Higher retention was achieved both at pH 8.2 and at pH 10 or higher. Handsheets showed superior breaking length results in the systems where the stock had been pretreated with the dispersant, though strength decreased strongly with increasing pH. Differences in filler content, as indicated by ash analysis, were not large enough to account for the observed strength differences. Formation uniformity was substantially increased by the pretreatment with dispersant, even in the presence of PVAm and throughout the studied pH range.

Journal articles
Magazine articles
Open Access
Z-directional testing of paperboard in combined tensile and compression loading, TAPPI Journal May 2024

ABSTRACT: The out-of-plane properties of paperboard are important in several converting applications such as printing, sealing, creasing, and calendering. A juxtaposed tensile and compression curve in the z direction (ZD) will, however, appear to have a kink or discontinuity at 0 stress. The purpose of the present work is to capture the continuous transition between tension and compression and to increase the understanding of the complex ZD properties of paperboard by cyclic testing. In this attempt to unify the ZD tensile and compressive behavior of paperboard, samples were laminated to the testing platens using heat seal laminate film. The method for adhering the samples was compared to samples that were laminated and glued to the testing platens. The edge effects of the cutting method were evaluated in compression testing with samples not attached to the testing platens. The flat slope seen in the initial part of the pure compression curve disappeared when the samples were laminated to the testing platens. The flat slope was instead replaced by a continuous response in the transition across 0 N. The stiffness in the transition region resembled the response in tensile testing. When the testing is cycled, the material exhibits a history dependence. Starting the cycle in either compression or tensile will show an effect on the stiffness at the transition, as well as the compressive stiffness. However, the ultimate tensile strength is unaffected.

Open Access
Effect of Flotation Deinked Recycled Fibre on Newsprint Printability, 1990 International Printing & Graphic Arts Conference Proceedings

Effect of Flotation Deinked Recycled Fibre on Newsprint Printability, 1990 International Printing & Graphic Arts Conference Proceedings

Journal articles
Open Access
Hydrodynamic Pressure Generated by Doctoring in Blade Gap Fo

Hydrodynamic Pressure Generated by Doctoring in Blade Gap Formers, 1999 Engineering Conference Proceedings

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